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-rw-r--r--arch/i386/cpu/Makefile50
-rw-r--r--arch/i386/cpu/config.mk26
-rw-r--r--arch/i386/cpu/cpu.c92
-rw-r--r--arch/i386/cpu/interrupts.c501
-rw-r--r--arch/i386/cpu/resetvec.S37
-rw-r--r--arch/i386/cpu/sc520/Makefile56
-rw-r--r--arch/i386/cpu/sc520/sc520.c198
-rw-r--r--arch/i386/cpu/sc520/sc520_asm.S581
-rw-r--r--arch/i386/cpu/sc520/sc520_pci.c171
-rw-r--r--arch/i386/cpu/sc520/sc520_ssi.c94
-rw-r--r--arch/i386/cpu/sc520/sc520_timer.c84
-rw-r--r--arch/i386/cpu/serial.c506
-rw-r--r--arch/i386/cpu/start.S135
-rw-r--r--arch/i386/cpu/start16.S112
14 files changed, 2643 insertions, 0 deletions
diff --git a/arch/i386/cpu/Makefile b/arch/i386/cpu/Makefile
new file mode 100644
index 0000000..c658c6e
--- /dev/null
+++ b/arch/i386/cpu/Makefile
@@ -0,0 +1,50 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2002
+# Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)lib$(CPU).a
+
+START = start.o start16.o resetvec.o
+COBJS = serial.o interrupts.o cpu.o
+
+SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
+START := $(addprefix $(obj),$(START))
+
+all: $(obj).depend $(START) $(LIB)
+
+$(LIB): $(OBJS)
+ $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/i386/cpu/config.mk b/arch/i386/cpu/config.mk
new file mode 100644
index 0000000..16a160d
--- /dev/null
+++ b/arch/i386/cpu/config.mk
@@ -0,0 +1,26 @@
+#
+# (C) Copyright 2002
+# Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+PLATFORM_RELFLAGS +=
+
+PLATFORM_CPPFLAGS += -march=i386 -Werror
diff --git a/arch/i386/cpu/cpu.c b/arch/i386/cpu/cpu.c
new file mode 100644
index 0000000..3010519
--- /dev/null
+++ b/arch/i386/cpu/cpu.c
@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/interrupt.h>
+
+int cpu_init_f(void)
+{
+ /* initialize FPU, reset EM, set MP and NE */
+ asm ("fninit\n" \
+ "movl %cr0, %eax\n" \
+ "andl $~0x4, %eax\n" \
+ "orl $0x22, %eax\n" \
+ "movl %eax, %cr0\n" );
+
+ return 0;
+}
+
+int cpu_init_r(void)
+{
+ /* Initialize core interrupt and exception functionality of CPU */
+ cpu_init_interrupts ();
+ return 0;
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ printf ("resetting ...\n");
+ udelay(50000); /* wait 50 ms */
+ disable_interrupts();
+ reset_cpu(0);
+
+ /*NOTREACHED*/
+ return 0;
+}
+
+void flush_cache (unsigned long dummy1, unsigned long dummy2)
+{
+ asm("wbinvd\n");
+ return;
+}
+
+void __attribute__ ((regparm(0))) generate_gpf(void);
+
+/* segment 0x70 is an arbitrary segment which does not exist */
+asm(".globl generate_gpf\n"
+ ".hidden generate_gpf\n"
+ ".type generate_gpf, @function\n"
+ "generate_gpf:\n"
+ "ljmp $0x70, $0x47114711\n");
+
+void __reset_cpu(ulong addr)
+{
+ printf("Resetting using i386 Triple Fault\n");
+ set_vector(13, generate_gpf); /* general protection fault handler */
+ set_vector(8, generate_gpf); /* double fault handler */
+ generate_gpf(); /* start the show */
+}
+void reset_cpu(ulong addr) __attribute__((weak, alias("__reset_cpu")));
diff --git a/arch/i386/cpu/interrupts.c b/arch/i386/cpu/interrupts.c
new file mode 100644
index 0000000..4b57437
--- /dev/null
+++ b/arch/i386/cpu/interrupts.c
@@ -0,0 +1,501 @@
+/*
+ * (C) Copyright 2008
+ * Graeme Russ, graeme.russ@gmail.com.
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/interrupt.h>
+
+#define DECLARE_INTERRUPT(x) \
+ ".globl irq_"#x"\n" \
+ ".hidden irq_"#x"\n" \
+ ".type irq_"#x", @function\n" \
+ "irq_"#x":\n" \
+ "pushl %ebp\n" \
+ "movl %esp,%ebp\n" \
+ "pusha\n" \
+ "pushl $"#x"\n" \
+ "jmp irq_common_entry\n"
+
+struct idt_entry {
+ u16 base_low;
+ u16 selector;
+ u8 res;
+ u8 access;
+ u16 base_high;
+} __attribute__ ((packed));
+
+struct desc_ptr {
+ unsigned short size;
+ unsigned long address;
+ unsigned short segment;
+} __attribute__((packed));
+
+struct idt_entry idt[256];
+
+struct desc_ptr idt_ptr;
+
+static inline void load_idt(const struct desc_ptr *dtr)
+{
+ asm volatile("cs lidt %0"::"m" (*dtr));
+}
+
+void set_vector(u8 intnum, void *routine)
+{
+ idt[intnum].base_high = (u16)((u32)(routine) >> 16);
+ idt[intnum].base_low = (u16)((u32)(routine) & 0xffff);
+}
+
+void irq_0(void);
+void irq_1(void);
+
+int cpu_init_interrupts(void)
+{
+ int i;
+
+ int irq_entry_size = irq_1 - irq_0;
+ void *irq_entry = (void *)irq_0;
+
+ /* Just in case... */
+ disable_interrupts();
+
+ /* Setup the IDT */
+ for (i=0;i<256;i++) {
+ idt[i].access = 0x8e;
+ idt[i].res = 0;
+ idt[i].selector = 0x10;
+ set_vector(i, irq_entry);
+ irq_entry += irq_entry_size;
+ }
+
+ idt_ptr.size = 256 * 8;
+ idt_ptr.address = (unsigned long) idt;
+ idt_ptr.segment = 0x18;
+
+ load_idt(&idt_ptr);
+
+ /* It is now safe to enable interrupts */
+ enable_interrupts();
+
+ return 0;
+}
+
+void __do_irq(int irq)
+{
+ printf("Unhandled IRQ : %d\n", irq);
+}
+void do_irq(int irq) __attribute__((weak, alias("__do_irq")));
+
+void enable_interrupts(void)
+{
+ asm("sti\n");
+}
+
+int disable_interrupts(void)
+{
+ long flags;
+
+ asm volatile ("pushfl ; popl %0 ; cli\n" : "=g" (flags) : );
+
+ return (flags&0x200); /* IE flags is bit 9 */
+}
+
+/* IRQ Low-Level Service Routine */
+__isr__ irq_llsr(int ip, int seg, int irq)
+{
+ /*
+ * For detailed description of each exception, refer to:
+ * Intel® 64 and IA-32 Architectures Software Developer's Manual
+ * Volume 1: Basic Architecture
+ * Order Number: 253665-029US, November 2008
+ * Table 6-1. Exceptions and Interrupts
+ */
+ switch (irq) {
+ case 0x00:
+ printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x01:
+ printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
+ break;
+ case 0x02:
+ printf("NMI Interrupt at %04x:%08x\n", seg, ip);
+ break;
+ case 0x03:
+ printf("Breakpoint at %04x:%08x\n", seg, ip);
+ break;
+ case 0x04:
+ printf("Overflow at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x05:
+ printf("BOUND Range Exceeded at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x06:
+ printf("Invalid Opcode (UnDefined Opcode) at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x07:
+ printf("Device Not Available (No Math Coprocessor) at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x08:
+ printf("Double fault at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x09:
+ printf("Co-processor segment overrun at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x0a:
+ printf("Invalid TSS at %04x:%08x\n", seg, ip);
+ break;
+ case 0x0b:
+ printf("Segment Not Present at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x0c:
+ printf("Stack Segment Fault at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x0d:
+ printf("General Protection at %04x:%08x\n", seg, ip);
+ break;
+ case 0x0e:
+ printf("Page fault at %04x:%08x\n", seg, ip);
+ while(1);
+ break;
+ case 0x0f:
+ printf("Floating-Point Error (Math Fault) at %04x:%08x\n", seg, ip);
+ break;
+ case 0x10:
+ printf("Alignment check at %04x:%08x\n", seg, ip);
+ break;
+ case 0x11:
+ printf("Machine Check at %04x:%08x\n", seg, ip);
+ break;
+ case 0x12:
+ printf("SIMD Floating-Point Exception at %04x:%08x\n", seg, ip);
+ break;
+ case 0x13:
+ case 0x14:
+ case 0x15:
+ case 0x16:
+ case 0x17:
+ case 0x18:
+ case 0x19:
+ case 0x1a:
+ case 0x1b:
+ case 0x1c:
+ case 0x1d:
+ case 0x1e:
+ case 0x1f:
+ printf("Reserved Exception %d at %04x:%08x\n", irq, seg, ip);
+ break;
+
+ default:
+ /* Hardware or User IRQ */
+ do_irq(irq);
+ }
+}
+
+/*
+ * OK - This looks really horrible, but it serves a purpose - It helps create
+ * fully relocatable code.
+ * - The call to irq_llsr will be a relative jump
+ * - The IRQ entries will be guaranteed to be in order
+ * It's a bit annoying that we need to waste 3 bytes per interrupt entry
+ * (total of 768 code bytes), but we MUST create a Stack Frame and this is
+ * the easiest way I could do it. Maybe it can be made better later.
+ */
+asm(".globl irq_common_entry\n" \
+ ".hidden irq_common_entry\n" \
+ ".type irq_common_entry, @function\n" \
+ "irq_common_entry:\n" \
+ "pushl $0\n" \
+ "pushl $0\n" \
+ "call irq_llsr\n" \
+ "popl %eax\n" \
+ "popl %eax\n" \
+ "popl %eax\n" \
+ "popa\n" \
+ "leave\n"\
+ "iret\n" \
+ DECLARE_INTERRUPT(0) \
+ DECLARE_INTERRUPT(1) \
+ DECLARE_INTERRUPT(2) \
+ DECLARE_INTERRUPT(3) \
+ DECLARE_INTERRUPT(4) \
+ DECLARE_INTERRUPT(5) \
+ DECLARE_INTERRUPT(6) \
+ DECLARE_INTERRUPT(7) \
+ DECLARE_INTERRUPT(8) \
+ DECLARE_INTERRUPT(9) \
+ DECLARE_INTERRUPT(10) \
+ DECLARE_INTERRUPT(11) \
+ DECLARE_INTERRUPT(12) \
+ DECLARE_INTERRUPT(13) \
+ DECLARE_INTERRUPT(14) \
+ DECLARE_INTERRUPT(15) \
+ DECLARE_INTERRUPT(16) \
+ DECLARE_INTERRUPT(17) \
+ DECLARE_INTERRUPT(18) \
+ DECLARE_INTERRUPT(19) \
+ DECLARE_INTERRUPT(20) \
+ DECLARE_INTERRUPT(21) \
+ DECLARE_INTERRUPT(22) \
+ DECLARE_INTERRUPT(23) \
+ DECLARE_INTERRUPT(24) \
+ DECLARE_INTERRUPT(25) \
+ DECLARE_INTERRUPT(26) \
+ DECLARE_INTERRUPT(27) \
+ DECLARE_INTERRUPT(28) \
+ DECLARE_INTERRUPT(29) \
+ DECLARE_INTERRUPT(30) \
+ DECLARE_INTERRUPT(31) \
+ DECLARE_INTERRUPT(32) \
+ DECLARE_INTERRUPT(33) \
+ DECLARE_INTERRUPT(34) \
+ DECLARE_INTERRUPT(35) \
+ DECLARE_INTERRUPT(36) \
+ DECLARE_INTERRUPT(37) \
+ DECLARE_INTERRUPT(38) \
+ DECLARE_INTERRUPT(39) \
+ DECLARE_INTERRUPT(40) \
+ DECLARE_INTERRUPT(41) \
+ DECLARE_INTERRUPT(42) \
+ DECLARE_INTERRUPT(43) \
+ DECLARE_INTERRUPT(44) \
+ DECLARE_INTERRUPT(45) \
+ DECLARE_INTERRUPT(46) \
+ DECLARE_INTERRUPT(47) \
+ DECLARE_INTERRUPT(48) \
+ DECLARE_INTERRUPT(49) \
+ DECLARE_INTERRUPT(50) \
+ DECLARE_INTERRUPT(51) \
+ DECLARE_INTERRUPT(52) \
+ DECLARE_INTERRUPT(53) \
+ DECLARE_INTERRUPT(54) \
+ DECLARE_INTERRUPT(55) \
+ DECLARE_INTERRUPT(56) \
+ DECLARE_INTERRUPT(57) \
+ DECLARE_INTERRUPT(58) \
+ DECLARE_INTERRUPT(59) \
+ DECLARE_INTERRUPT(60) \
+ DECLARE_INTERRUPT(61) \
+ DECLARE_INTERRUPT(62) \
+ DECLARE_INTERRUPT(63) \
+ DECLARE_INTERRUPT(64) \
+ DECLARE_INTERRUPT(65) \
+ DECLARE_INTERRUPT(66) \
+ DECLARE_INTERRUPT(67) \
+ DECLARE_INTERRUPT(68) \
+ DECLARE_INTERRUPT(69) \
+ DECLARE_INTERRUPT(70) \
+ DECLARE_INTERRUPT(71) \
+ DECLARE_INTERRUPT(72) \
+ DECLARE_INTERRUPT(73) \
+ DECLARE_INTERRUPT(74) \
+ DECLARE_INTERRUPT(75) \
+ DECLARE_INTERRUPT(76) \
+ DECLARE_INTERRUPT(77) \
+ DECLARE_INTERRUPT(78) \
+ DECLARE_INTERRUPT(79) \
+ DECLARE_INTERRUPT(80) \
+ DECLARE_INTERRUPT(81) \
+ DECLARE_INTERRUPT(82) \
+ DECLARE_INTERRUPT(83) \
+ DECLARE_INTERRUPT(84) \
+ DECLARE_INTERRUPT(85) \
+ DECLARE_INTERRUPT(86) \
+ DECLARE_INTERRUPT(87) \
+ DECLARE_INTERRUPT(88) \
+ DECLARE_INTERRUPT(89) \
+ DECLARE_INTERRUPT(90) \
+ DECLARE_INTERRUPT(91) \
+ DECLARE_INTERRUPT(92) \
+ DECLARE_INTERRUPT(93) \
+ DECLARE_INTERRUPT(94) \
+ DECLARE_INTERRUPT(95) \
+ DECLARE_INTERRUPT(97) \
+ DECLARE_INTERRUPT(96) \
+ DECLARE_INTERRUPT(98) \
+ DECLARE_INTERRUPT(99) \
+ DECLARE_INTERRUPT(100) \
+ DECLARE_INTERRUPT(101) \
+ DECLARE_INTERRUPT(102) \
+ DECLARE_INTERRUPT(103) \
+ DECLARE_INTERRUPT(104) \
+ DECLARE_INTERRUPT(105) \
+ DECLARE_INTERRUPT(106) \
+ DECLARE_INTERRUPT(107) \
+ DECLARE_INTERRUPT(108) \
+ DECLARE_INTERRUPT(109) \
+ DECLARE_INTERRUPT(110) \
+ DECLARE_INTERRUPT(111) \
+ DECLARE_INTERRUPT(112) \
+ DECLARE_INTERRUPT(113) \
+ DECLARE_INTERRUPT(114) \
+ DECLARE_INTERRUPT(115) \
+ DECLARE_INTERRUPT(116) \
+ DECLARE_INTERRUPT(117) \
+ DECLARE_INTERRUPT(118) \
+ DECLARE_INTERRUPT(119) \
+ DECLARE_INTERRUPT(120) \
+ DECLARE_INTERRUPT(121) \
+ DECLARE_INTERRUPT(122) \
+ DECLARE_INTERRUPT(123) \
+ DECLARE_INTERRUPT(124) \
+ DECLARE_INTERRUPT(125) \
+ DECLARE_INTERRUPT(126) \
+ DECLARE_INTERRUPT(127) \
+ DECLARE_INTERRUPT(128) \
+ DECLARE_INTERRUPT(129) \
+ DECLARE_INTERRUPT(130) \
+ DECLARE_INTERRUPT(131) \
+ DECLARE_INTERRUPT(132) \
+ DECLARE_INTERRUPT(133) \
+ DECLARE_INTERRUPT(134) \
+ DECLARE_INTERRUPT(135) \
+ DECLARE_INTERRUPT(136) \
+ DECLARE_INTERRUPT(137) \
+ DECLARE_INTERRUPT(138) \
+ DECLARE_INTERRUPT(139) \
+ DECLARE_INTERRUPT(140) \
+ DECLARE_INTERRUPT(141) \
+ DECLARE_INTERRUPT(142) \
+ DECLARE_INTERRUPT(143) \
+ DECLARE_INTERRUPT(144) \
+ DECLARE_INTERRUPT(145) \
+ DECLARE_INTERRUPT(146) \
+ DECLARE_INTERRUPT(147) \
+ DECLARE_INTERRUPT(148) \
+ DECLARE_INTERRUPT(149) \
+ DECLARE_INTERRUPT(150) \
+ DECLARE_INTERRUPT(151) \
+ DECLARE_INTERRUPT(152) \
+ DECLARE_INTERRUPT(153) \
+ DECLARE_INTERRUPT(154) \
+ DECLARE_INTERRUPT(155) \
+ DECLARE_INTERRUPT(156) \
+ DECLARE_INTERRUPT(157) \
+ DECLARE_INTERRUPT(158) \
+ DECLARE_INTERRUPT(159) \
+ DECLARE_INTERRUPT(160) \
+ DECLARE_INTERRUPT(161) \
+ DECLARE_INTERRUPT(162) \
+ DECLARE_INTERRUPT(163) \
+ DECLARE_INTERRUPT(164) \
+ DECLARE_INTERRUPT(165) \
+ DECLARE_INTERRUPT(166) \
+ DECLARE_INTERRUPT(167) \
+ DECLARE_INTERRUPT(168) \
+ DECLARE_INTERRUPT(169) \
+ DECLARE_INTERRUPT(170) \
+ DECLARE_INTERRUPT(171) \
+ DECLARE_INTERRUPT(172) \
+ DECLARE_INTERRUPT(173) \
+ DECLARE_INTERRUPT(174) \
+ DECLARE_INTERRUPT(175) \
+ DECLARE_INTERRUPT(176) \
+ DECLARE_INTERRUPT(177) \
+ DECLARE_INTERRUPT(178) \
+ DECLARE_INTERRUPT(179) \
+ DECLARE_INTERRUPT(180) \
+ DECLARE_INTERRUPT(181) \
+ DECLARE_INTERRUPT(182) \
+ DECLARE_INTERRUPT(183) \
+ DECLARE_INTERRUPT(184) \
+ DECLARE_INTERRUPT(185) \
+ DECLARE_INTERRUPT(186) \
+ DECLARE_INTERRUPT(187) \
+ DECLARE_INTERRUPT(188) \
+ DECLARE_INTERRUPT(189) \
+ DECLARE_INTERRUPT(190) \
+ DECLARE_INTERRUPT(191) \
+ DECLARE_INTERRUPT(192) \
+ DECLARE_INTERRUPT(193) \
+ DECLARE_INTERRUPT(194) \
+ DECLARE_INTERRUPT(195) \
+ DECLARE_INTERRUPT(196) \
+ DECLARE_INTERRUPT(197) \
+ DECLARE_INTERRUPT(198) \
+ DECLARE_INTERRUPT(199) \
+ DECLARE_INTERRUPT(200) \
+ DECLARE_INTERRUPT(201) \
+ DECLARE_INTERRUPT(202) \
+ DECLARE_INTERRUPT(203) \
+ DECLARE_INTERRUPT(204) \
+ DECLARE_INTERRUPT(205) \
+ DECLARE_INTERRUPT(206) \
+ DECLARE_INTERRUPT(207) \
+ DECLARE_INTERRUPT(208) \
+ DECLARE_INTERRUPT(209) \
+ DECLARE_INTERRUPT(210) \
+ DECLARE_INTERRUPT(211) \
+ DECLARE_INTERRUPT(212) \
+ DECLARE_INTERRUPT(213) \
+ DECLARE_INTERRUPT(214) \
+ DECLARE_INTERRUPT(215) \
+ DECLARE_INTERRUPT(216) \
+ DECLARE_INTERRUPT(217) \
+ DECLARE_INTERRUPT(218) \
+ DECLARE_INTERRUPT(219) \
+ DECLARE_INTERRUPT(220) \
+ DECLARE_INTERRUPT(221) \
+ DECLARE_INTERRUPT(222) \
+ DECLARE_INTERRUPT(223) \
+ DECLARE_INTERRUPT(224) \
+ DECLARE_INTERRUPT(225) \
+ DECLARE_INTERRUPT(226) \
+ DECLARE_INTERRUPT(227) \
+ DECLARE_INTERRUPT(228) \
+ DECLARE_INTERRUPT(229) \
+ DECLARE_INTERRUPT(230) \
+ DECLARE_INTERRUPT(231) \
+ DECLARE_INTERRUPT(232) \
+ DECLARE_INTERRUPT(233) \
+ DECLARE_INTERRUPT(234) \
+ DECLARE_INTERRUPT(235) \
+ DECLARE_INTERRUPT(236) \
+ DECLARE_INTERRUPT(237) \
+ DECLARE_INTERRUPT(238) \
+ DECLARE_INTERRUPT(239) \
+ DECLARE_INTERRUPT(240) \
+ DECLARE_INTERRUPT(241) \
+ DECLARE_INTERRUPT(242) \
+ DECLARE_INTERRUPT(243) \
+ DECLARE_INTERRUPT(244) \
+ DECLARE_INTERRUPT(245) \
+ DECLARE_INTERRUPT(246) \
+ DECLARE_INTERRUPT(247) \
+ DECLARE_INTERRUPT(248) \
+ DECLARE_INTERRUPT(249) \
+ DECLARE_INTERRUPT(250) \
+ DECLARE_INTERRUPT(251) \
+ DECLARE_INTERRUPT(252) \
+ DECLARE_INTERRUPT(253) \
+ DECLARE_INTERRUPT(254) \
+ DECLARE_INTERRUPT(255));
diff --git a/arch/i386/cpu/resetvec.S b/arch/i386/cpu/resetvec.S
new file mode 100644
index 0000000..d9222dd
--- /dev/null
+++ b/arch/i386/cpu/resetvec.S
@@ -0,0 +1,37 @@
+/*
+ * U-boot - i386 Startup Code
+ *
+ * Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* Reset vector, jumps to start16.S */
+
+.extern start16
+
+.section .resetvec, "ax"
+.code16
+reset_vector:
+ cli
+ cld
+ jmp start16
+
+ .org 0xf
+ nop
diff --git a/arch/i386/cpu/sc520/Makefile b/arch/i386/cpu/sc520/Makefile
new file mode 100644
index 0000000..87835b2
--- /dev/null
+++ b/arch/i386/cpu/sc520/Makefile
@@ -0,0 +1,56 @@
+#
+# (C) Copyright 2008
+# Graeme Russ, graeme.russ@gmail.com.
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2002
+# Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB := $(obj)lib$(SOC).a
+
+COBJS-$(CONFIG_SYS_SC520) += sc520.o
+COBJS-$(CONFIG_SYS_SC520_SSI) += sc520_ssi.o
+COBJS-$(CONFIG_SYS_SC520_TIMER) += sc520_timer.o
+COBJS-$(CONFIG_PCI) += sc520_pci.o
+
+SOBJS-$(CONFIG_SYS_SC520) += sc520_asm.o
+
+SRCS := $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
+OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
+
+all: $(obj).depend $(LIB)
+
+$(LIB): $(OBJS)
+ $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+######################################################################### \ No newline at end of file
diff --git a/arch/i386/cpu/sc520/sc520.c b/arch/i386/cpu/sc520/sc520.c
new file mode 100644
index 0000000..4b566a7
--- /dev/null
+++ b/arch/i386/cpu/sc520/sc520.c
@@ -0,0 +1,198 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520,
+ * but idependent of implementation */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/ic/sc520.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * utility functions for boards based on the AMD sc520
+ *
+ * void init_sc520(void)
+ * unsigned long init_sc520_dram(void)
+ */
+
+volatile sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)0xfffef000;
+
+void init_sc520(void)
+{
+ /* Set the UARTxCTL register at it's slower,
+ * baud clock giving us a 1.8432 MHz reference
+ */
+ sc520_mmcr->uart1ctl = 0x07;
+ sc520_mmcr->uart2ctl = 0x07;
+
+ /* first set the timer pin mapping */
+ sc520_mmcr->clksel = 0x72; /* no clock frequency selected, use 1.1892MHz */
+
+ /* enable PCI bus arbitrer */
+ sc520_mmcr->sysarbctl = 0x02; /* enable concurrent mode */
+
+ sc520_mmcr->sysarbmenb = 0x1f; /* enable external grants */
+ sc520_mmcr->hbctl = 0x04; /* enable posted-writes */
+
+ if (CONFIG_SYS_SC520_HIGH_SPEED) {
+ sc520_mmcr->cpuctl = 0x02; /* set it to 133 MHz and write back */
+ gd->cpu_clk = 133000000;
+ printf("## CPU Speed set to 133MHz\n");
+ } else {
+ sc520_mmcr->cpuctl = 0x01; /* set it to 100 MHz and write back */
+ printf("## CPU Speed set to 100MHz\n");
+ gd->cpu_clk = 100000000;
+ }
+
+
+ /* wait at least one millisecond */
+ asm("movl $0x2000,%%ecx\n"
+ "0: pushl %%ecx\n"
+ "popl %%ecx\n"
+ "loop 0b\n": : : "ecx");
+
+ /* turn on the SDRAM write buffer */
+ sc520_mmcr->dbctl = 0x11;
+
+ /* turn on the cache and disable write through */
+ asm("movl %%cr0, %%eax\n"
+ "andl $0x9fffffff, %%eax\n"
+ "movl %%eax, %%cr0\n" : : : "eax");
+}
+
+unsigned long init_sc520_dram(void)
+{
+ bd_t *bd = gd->bd;
+
+ u32 dram_present=0;
+ u32 dram_ctrl;
+#ifdef CONFIG_SYS_SDRAM_DRCTMCTL
+ /* these memory control registers are set up in the assember part,
+ * in sc520_asm.S, during 'mem_init'. If we muck with them here,
+ * after we are running a stack in RAM, we have troubles. Besides,
+ * these refresh and delay values are better ? simply specified
+ * outright in the include/configs/{cfg} file since the HW designer
+ * simply dictates it.
+ */
+#else
+ int val;
+
+ int cas_precharge_delay = CONFIG_SYS_SDRAM_PRECHARGE_DELAY;
+ int refresh_rate = CONFIG_SYS_SDRAM_REFRESH_RATE;
+ int ras_cas_delay = CONFIG_SYS_SDRAM_RAS_CAS_DELAY;
+
+ /* set SDRAM speed here */
+
+ refresh_rate/=78;
+ if (refresh_rate<=1) {
+ val = 0; /* 7.8us */
+ } else if (refresh_rate==2) {
+ val = 1; /* 15.6us */
+ } else if (refresh_rate==3 || refresh_rate==4) {
+ val = 2; /* 31.2us */
+ } else {
+ val = 3; /* 62.4us */
+ }
+
+ sc520_mmcr->drcctl = (sc520_mmcr->drcctl & 0xcf) | (val<<4);
+
+ val = sc520_mmcr->drctmctl & 0xf0;
+
+ if (cas_precharge_delay==3) {
+ val |= 0x04; /* 3T */
+ } else if (cas_precharge_delay==4) {
+ val |= 0x08; /* 4T */
+ } else if (cas_precharge_delay>4) {
+ val |= 0x0c;
+ }
+
+ if (ras_cas_delay > 3) {
+ val |= 2;
+ } else {
+ val |= 1;
+ }
+ sc520_mmcr->drctmctl = val;
+#endif
+
+ /* We read-back the configuration of the dram
+ * controller that the assembly code wrote */
+ dram_ctrl = sc520_mmcr->drcbendadr;
+
+ bd->bi_dram[0].start = 0;
+ if (dram_ctrl & 0x80) {
+ /* bank 0 enabled */
+ dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
+ bd->bi_dram[0].size = bd->bi_dram[1].start;
+
+ } else {
+ bd->bi_dram[0].size = 0;
+ bd->bi_dram[1].start = bd->bi_dram[0].start;
+ }
+
+ if (dram_ctrl & 0x8000) {
+ /* bank 1 enabled */
+ dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
+ bd->bi_dram[1].size = bd->bi_dram[2].start - bd->bi_dram[1].start;
+ } else {
+ bd->bi_dram[1].size = 0;
+ bd->bi_dram[2].start = bd->bi_dram[1].start;
+ }
+
+ if (dram_ctrl & 0x800000) {
+ /* bank 2 enabled */
+ dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
+ bd->bi_dram[2].size = bd->bi_dram[3].start - bd->bi_dram[2].start;
+ } else {
+ bd->bi_dram[2].size = 0;
+ bd->bi_dram[3].start = bd->bi_dram[2].start;
+ }
+
+ if (dram_ctrl & 0x80000000) {
+ /* bank 3 enabled */
+ dram_present = (dram_ctrl & 0x7f000000) >> 2;
+ bd->bi_dram[3].size = dram_present - bd->bi_dram[3].start;
+ } else {
+ bd->bi_dram[3].size = 0;
+ }
+
+
+#if 0
+ printf("Configured %d bytes of dram\n", dram_present);
+#endif
+ gd->ram_size = dram_present;
+
+ return dram_present;
+}
+
+#ifdef CONFIG_SYS_SC520_RESET
+void reset_cpu(ulong addr)
+{
+ printf("Resetting using SC520 MMCR\n");
+ /* Write a '1' to the SYS_RST of the RESCFG MMCR */
+ sc520_mmcr->rescfg = 0x01;
+
+ /* NOTREACHED */
+}
+#endif
diff --git a/arch/i386/cpu/sc520/sc520_asm.S b/arch/i386/cpu/sc520/sc520_asm.S
new file mode 100644
index 0000000..2042d9b
--- /dev/null
+++ b/arch/i386/cpu/sc520/sc520_asm.S
@@ -0,0 +1,581 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* This file is largely based on code obtned from AMD. AMD's original
+ * copyright is included below
+ */
+
+/*
+ * =============================================================================
+ *
+ * Copyright 1999 Advanced Micro Devices, Inc.
+ *
+ * This software is the property of Advanced Micro Devices, Inc (AMD) which
+ * specifically grants the user the right to modify, use and distribute this
+ * software provided this COPYRIGHT NOTICE is not removed or altered. All
+ * other rights are reserved by AMD.
+ *
+ * THE MATERIALS ARE PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED WARRANTY
+ * OF ANY KIND INCLUDING WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT OF
+ * THIRD-PARTY INTELLECTUAL PROPERTY, OR FITNESS FOR ANY PARTICULAR PURPOSE.
+ * IN NO EVENT SHALL AMD OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
+ * (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS
+ * INTERRUPTION, LOSS OF INFORMAITON) ARISING OUT OF THE USE OF OR INABILITY
+ * TO USE THE MATERIALS, EVEN IF AMD HAS BEEN ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES. BECAUSE SOME JURSIDICTIONS PROHIBIT THE EXCLUSION OR
+ * LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE ABOVE
+ * LIMITATION MAY NOT APPLY TO YOU.
+ *
+ * AMD does not assume any responsibility for any errors that may appear in
+ * the Materials nor any responsibility to support or update the Materials.
+ * AMD retains the right to make changes to its test specifications at any
+ * time, without notice.
+ *
+ * So that all may benefit from your experience, please report any problems
+ * or suggestions about this software back to AMD. Please include your name,
+ * company, telephone number, AMD product requiring support and question or
+ * problem encountered.
+ *
+ * Advanced Micro Devices, Inc. Worldwide support and contact
+ * Embedded Processor Division information available at:
+ * Systems Engineering epd.support@amd.com
+ * 5204 E. Ben White Blvd. -or-
+ * Austin, TX 78741 http://www.amd.com/html/support/techsup.html
+ * ============================================================================
+ */
+
+
+/*******************************************************************************
+ * AUTHOR : Buddy Fey - Original.
+ *******************************************************************************
+ */
+
+
+/*******************************************************************************
+ * FUNCTIONAL DESCRIPTION:
+ * This routine is called to autodetect the geometry of the DRAM.
+ *
+ * This routine is called to determine the number of column bits for the DRAM
+ * devices in this external bank. This routine assumes that the external bank
+ * has been configured for an 11-bit column and for 4 internal banks. This gives
+ * us the maximum address reach in memory. By writing a test value to the max
+ * address and locating where it aliases to, we can determine the number of valid
+ * column bits.
+ *
+ * This routine is called to determine the number of internal banks each DRAM
+ * device has. The external bank (under test) is configured for maximum reach
+ * with 11-bit columns and 4 internal banks. This routine will write to a max
+ * address (BA1 and BA0 = 1) and then read from an address with BA1=0 to see if
+ * that column is a "don't care". If BA1 does not affect write/read of data,
+ * then this device has only 2 internal banks.
+ *
+ * This routine is called to determine the ending address for this external
+ * bank of SDRAM. We write to a max address with a data value and then disable
+ * row address bits looking for "don't care" locations. Each "don't care" bit
+ * represents a dividing of the maximum density (128M) by 2. By dividing the
+ * maximum of 32 4M chunks in an external bank down by all the "don't care" bits
+ * determined during sizing, we set the proper density.
+ *
+ * WARNINGS.
+ * bp must be preserved because it is used for return linkage.
+ *
+ * EXIT
+ * nothing returned - but the memory subsystem is enabled
+ *******************************************************************************
+ */
+
+#include <config.h>
+
+.section .text
+.equ DRCCTL, 0x0fffef010 /* DRAM control register */
+.equ DRCTMCTL, 0x0fffef012 /* DRAM timing control register */
+.equ DRCCFG, 0x0fffef014 /* DRAM bank configuration register */
+.equ DRCBENDADR, 0x0fffef018 /* DRAM bank ending address register */
+.equ ECCCTL, 0x0fffef020 /* DRAM ECC control register */
+.equ ECCINT, 0x0fffefd18 /* DRAM ECC nmi-INT mapping */
+.equ DBCTL, 0x0fffef040 /* DRAM buffer control register */
+
+.equ CACHELINESZ, 0x00000010 /* size of our cache line (read buffer) */
+.equ COL11_ADR, 0x0e001e00 /* 11 col addrs */
+.equ COL10_ADR, 0x0e000e00 /* 10 col addrs */
+.equ COL09_ADR, 0x0e000600 /* 9 col addrs */
+.equ COL08_ADR, 0x0e000200 /* 8 col addrs */
+.equ ROW14_ADR, 0x0f000000 /* 14 row addrs */
+.equ ROW13_ADR, 0x07000000 /* 13 row addrs */
+.equ ROW12_ADR, 0x03000000 /* 12 row addrs */
+.equ ROW11_ADR, 0x01000000 /* 11 row addrs/also bank switch */
+.equ ROW10_ADR, 0x00000000 /* 10 row addrs/also bank switch */
+.equ COL11_DATA, 0x0b0b0b0b /* 11 col addrs */
+.equ COL10_DATA, 0x0a0a0a0a /* 10 col data */
+.equ COL09_DATA, 0x09090909 /* 9 col data */
+.equ COL08_DATA, 0x08080808 /* 8 col data */
+.equ ROW14_DATA, 0x3f3f3f3f /* 14 row data (MASK) */
+.equ ROW13_DATA, 0x1f1f1f1f /* 13 row data (MASK) */
+.equ ROW12_DATA, 0x0f0f0f0f /* 12 row data (MASK) */
+.equ ROW11_DATA, 0x07070707 /* 11 row data/also bank switch (MASK) */
+.equ ROW10_DATA, 0xaaaaaaaa /* 10 row data/also bank switch (MASK) */
+
+
+ /*
+ * initialize dram controller registers
+ */
+.globl mem_init
+mem_init:
+ xorw %ax,%ax
+ movl $DBCTL, %edi
+ movb %al, (%edi) /* disable write buffer */
+
+ movl $ECCCTL, %edi
+ movb %al, (%edi) /* disable ECC */
+
+ movl $DRCTMCTL, %edi
+ movb $0x1E,%al /* Set SDRAM timing for slowest */
+ movb %al, (%edi)
+
+ /*
+ * setup loop to do 4 external banks starting with bank 3
+ */
+ movl $0xff000000,%eax /* enable last bank and setup */
+ movl $DRCBENDADR, %edi /* ending address register */
+ movl %eax, (%edi)
+
+ movl $DRCCFG, %edi /* setup */
+ movw $0xbbbb,%ax /* dram config register for */
+ movw %ax, (%edi)
+
+ /*
+ * issue a NOP to all DRAMs
+ */
+ movl $DRCCTL, %edi /* setup DRAM control register with */
+ movb $0x1,%al /* Disable refresh,disable write buffer */
+ movb %al, (%edi)
+ movl $CACHELINESZ, %esi /* just a dummy address to write for */
+ movw %ax, (%esi)
+ /*
+ * delay for 100 usec? 200?
+ * ******this is a cludge for now *************
+ */
+ movw $100,%cx
+sizdelay:
+ loop sizdelay /* we need 100 usec here */
+ /***********************************************/
+
+ /*
+ * issue all banks precharge
+ */
+ movb $0x2,%al /* All banks precharge */
+ movb %al, (%edi)
+ movw %ax, (%esi)
+
+ /*
+ * issue 2 auto refreshes to all banks
+ */
+ movb $0x4,%al /* Auto refresh cmd */
+ movb %al, (%edi)
+ movw $2,%cx
+refresh1:
+ movw %ax, (%esi)
+ loop refresh1
+
+ /*
+ * issue LOAD MODE REGISTER command
+ */
+ movb $0x3,%al /* Load mode register cmd */
+ movb %al, (%edi)
+ movw %ax, (%esi)
+
+ /*
+ * issue 8 more auto refreshes to all banks
+ */
+ movb $0x4,%al /* Auto refresh cmd */
+ movb %al, (%edi)
+ movw $8,%cx
+refresh2:
+ movw %ax, (%esi)
+ loop refresh2
+
+ /*
+ * set control register to NORMAL mode
+ */
+ movb $0x0,%al /* Normal mode value */
+ movb %al, (%edi)
+
+ /*
+ * size dram starting with external bank 3 moving to external bank 0
+ */
+ movl $0x3,%ecx /* start with external bank 3 */
+
+nextbank:
+
+ /*
+ * write col 11 wrap adr
+ */
+ movl $COL11_ADR, %esi /* set address to max col (11) wrap addr */
+ movl $COL11_DATA, %eax /* pattern for max supported columns(11) */
+ movl %eax, (%esi) /* write max col pattern at max col adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write col 10 wrap adr
+ */
+
+ movl $COL10_ADR, %esi /* set address to 10 col wrap address */
+ movl $COL10_DATA, %eax /* pattern for 10 col wrap */
+ movl %eax, (%esi) /* write 10 col pattern @ 10 col wrap adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write col 9 wrap adr
+ */
+ movl $COL09_ADR, %esi /* set address to 9 col wrap address */
+ movl $COL09_DATA, %eax /* pattern for 9 col wrap */
+ movl %eax, (%esi) /* write 9 col pattern @ 9 col wrap adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write col 8 wrap adr
+ */
+ movl $COL08_ADR, %esi /* set address to min(8) col wrap address */
+ movl $COL08_DATA, %eax /* pattern for min (8) col wrap */
+ movl %eax, (%esi) /* write min col pattern @ min col adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write row 14 wrap adr
+ */
+ movl $ROW14_ADR, %esi /* set address to max row (14) wrap addr */
+ movl $ROW14_DATA, %eax /* pattern for max supported rows(14) */
+ movl %eax, (%esi) /* write max row pattern at max row adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write row 13 wrap adr
+ */
+ movl $ROW13_ADR, %esi /* set address to 13 row wrap address */
+ movl $ROW13_DATA, %eax /* pattern for 13 row wrap */
+ movl %eax, (%esi) /* write 13 row pattern @ 13 row wrap adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write row 12 wrap adr
+ */
+ movl $ROW12_ADR, %esi /* set address to 12 row wrap address */
+ movl $ROW12_DATA, %eax /* pattern for 12 row wrap */
+ movl %eax, (%esi) /* write 12 row pattern @ 12 row wrap adr */
+ movl (%esi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write row 11 wrap adr
+ */
+ movl $ROW11_ADR, %edi /* set address to 11 row wrap address */
+ movl $ROW11_DATA, %eax /* pattern for 11 row wrap */
+ movl %eax, (%edi) /* write 11 row pattern @ 11 row wrap adr */
+ movl (%edi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * write row 10 wrap adr --- this write is really to determine number of banks
+ */
+ movl $ROW10_ADR, %edi /* set address to 10 row wrap address */
+ movl $ROW10_DATA, %eax /* pattern for 10 row wrap (AA) */
+ movl %eax, (%edi) /* write 10 row pattern @ 10 row wrap adr */
+ movl (%edi), %ebx /* optional read */
+ cmpl %ebx,%eax /* to verify write */
+ jnz bad_ram /* this ram is bad */
+ /*
+ * read data @ row 12 wrap adr to determine * banks,
+ * and read data @ row 14 wrap adr to determine * rows.
+ * if data @ row 12 wrap adr is not AA, 11 or 12 we have bad RAM.
+ * if data @ row 12 wrap == AA, we only have 2 banks, NOT 4
+ * if data @ row 12 wrap == 11 or 12, we have 4 banks,
+ */
+ xorw %di,%di /* value for 2 banks in DI */
+ movl (%esi), %ebx /* read from 12 row wrap to check banks
+ * (esi is setup from the write to row 12 wrap) */
+ cmpl %ebx,%eax /* check for AA pattern (eax holds the aa pattern) */
+ jz only2 /* if pattern == AA, we only have 2 banks */
+
+ /* 4 banks */
+
+ movw $8,%di /* value for 4 banks in DI (BNK_CNT bit) */
+ cmpl $ROW11_DATA, %ebx /* only other legitimate values are 11 */
+ jz only2
+ cmpl $ROW12_DATA, %ebx /* and 12 */
+ jnz bad_ram /* its bad if not 11 or 12! */
+
+ /* fall through */
+only2:
+ /*
+ * validate row mask
+ */
+ movl $ROW14_ADR, %esi /* set address back to max row wrap addr */
+ movl (%esi), %eax /* read actual number of rows @ row14 adr */
+
+ cmpl $ROW11_DATA, %eax /* row must be greater than 11 pattern */
+ jb bad_ram
+
+ cmpl $ROW14_DATA, %eax /* and row must be less than 14 pattern */
+ ja bad_ram
+
+ cmpb %ah,%al /* verify all 4 bytes of dword same */
+ jnz bad_ram
+ movl %eax,%ebx
+ shrl $16,%ebx
+ cmpw %bx,%ax
+ jnz bad_ram
+ /*
+ * read col 11 wrap adr for real column data value
+ */
+ movl $COL11_ADR, %esi /* set address to max col (11) wrap addr */
+ movl (%esi), %eax /* read real col number at max col adr */
+ /*
+ * validate column data
+ */
+ cmpl $COL08_DATA, %eax /* col must be greater than 8 pattern */
+ jb bad_ram
+
+ cmpl $COL11_DATA, %eax /* and row must be less than 11 pattern */
+ ja bad_ram
+
+ subl $COL08_DATA, %eax /* normalize column data to zero */
+ jc bad_ram
+ cmpb %ah,%al /* verify all 4 bytes of dword equal */
+ jnz bad_ram
+ movl %eax,%edx
+ shrl $16,%edx
+ cmpw %dx,%ax
+ jnz bad_ram
+ /*
+ * merge bank and col data together
+ */
+ addw %di,%dx /* merge of bank and col info in dl */
+ /*
+ * fix ending addr mask based upon col info
+ */
+ movb $3,%al
+ subb %dh,%al /* dh contains the overflow from the bank/col merge */
+ movb %bl,%dh /* bl contains the row mask (aa, 07, 0f, 1f or 3f) */
+ xchgw %cx,%ax /* cx = ax = 3 or 2 depending on 2 or 4 bank device */
+ shrb %cl,%dh /* */
+ incb %dh /* ending addr is 1 greater than real end */
+ xchgw %cx,%ax /* cx is bank number again */
+ /*
+ * issue all banks precharge
+ */
+bad_reint:
+ movl $DRCCTL, %esi /* setup DRAM control register with */
+ movb $0x2,%al /* All banks precharge */
+ movb %al, (%esi)
+ movl $CACHELINESZ, %esi /* address to init read buffer */
+ movw %ax, (%esi)
+
+ /*
+ * update ENDING ADDRESS REGISTER
+ */
+ movl $DRCBENDADR, %edi /* DRAM ending address register */
+ movl %ecx,%ebx
+ addl %ebx, %edi
+ movb %dh, (%edi)
+ /*
+ * update CONFIG REGISTER
+ */
+ xorb %dh,%dh
+ movw $0x00f,%bx
+ movw %cx,%ax
+ shlw $2,%ax
+ xchgw %cx,%ax
+ shlw %cl,%dx
+ shlw %cl,%bx
+ notw %bx
+ xchgw %cx,%ax
+ movl $DRCCFG, %edi
+ mov (%edi), %ax
+ andw %bx,%ax
+ orw %dx,%ax
+ movw %ax, (%edi)
+ jcxz cleanup
+
+ decw %cx
+ movl %ecx,%ebx
+ movl $DRCBENDADR, %edi /* DRAM ending address register */
+ movb $0xff,%al
+ addl %ebx, %edi
+ movb %al, (%edi)
+ /*
+ * set control register to NORMAL mode
+ */
+ movl $DRCCTL, %esi /* setup DRAM control register with */
+ movb $0x0,%al /* Normal mode value */
+ movb %al, (%esi)
+ movl $CACHELINESZ, %esi /* address to init read buffer */
+ movw %ax, (%esi)
+ jmp nextbank
+
+cleanup:
+ movl $DRCBENDADR, %edi /* DRAM ending address register */
+ movw $4,%cx
+ xorw %ax,%ax
+cleanuplp:
+ movb (%edi), %al
+ orb %al,%al
+ jz emptybank
+
+ addb %ah,%al
+ jns nottoomuch
+
+ movb $0x7f,%al
+nottoomuch:
+ movb %al,%ah
+ orb $0x80,%al
+ movb %al, (%edi)
+emptybank:
+ incl %edi
+ loop cleanuplp
+
+#if defined CONFIG_SYS_SDRAM_DRCTMCTL
+ /* just have your hardware desinger _GIVE_ you what you need here! */
+ movl $DRCTMCTL, %edi
+ movb $CONFIG_SYS_SDRAM_DRCTMCTL,%al
+ movb (%edi), %al
+#else
+#if defined(CONFIG_SYS_SDRAM_CAS_LATENCY_2T) || defined(CONFIG_SYS_SDRAM_CAS_LATENCY_3T)
+ /* set the CAS latency now since it is hard to do
+ * when we run from the RAM */
+ movl $DRCTMCTL, %edi /* DRAM timing register */
+ movb (%edi), %al
+#ifdef CONFIG_SYS_SDRAM_CAS_LATENCY_2T
+ andb $0xef, %al
+#endif
+#ifdef CONFIG_SYS_SDRAM_CAS_LATENCY_3T
+ orb $0x10, %al
+#endif
+ movb %al, (%edi)
+#endif
+#endif
+ movl $DRCCTL, %edi /* DRAM Control register */
+ movb $0x3,%al /* Load mode register cmd */
+ movb %al, (%edi)
+ movw %ax, (%esi)
+
+
+ movl $DRCCTL, %edi /* DRAM Control register */
+ movb $0x18,%al /* Enable refresh and NORMAL mode */
+ movb %al, (%edi)
+
+ jmp dram_done
+
+bad_ram:
+ xorl %edx,%edx
+ xorl %edi,%edi
+ jmp bad_reint
+
+dram_done:
+
+ /* readback DRCBENDADR and return the number
+ * of available ram bytes in %eax */
+
+ movl $DRCBENDADR, %edi /* DRAM ending address register */
+
+ movl (%edi), %eax
+ movl %eax, %ecx
+ andl $0x80000000, %ecx
+ jz bank2
+ andl $0x7f000000, %eax
+ shrl $2, %eax
+ movl %eax, %ebx
+
+bank2: movl (%edi), %eax
+ movl %eax, %ecx
+ andl $0x00800000, %ecx
+ jz bank1
+ andl $0x007f0000, %eax
+ shll $6, %eax
+ movl %eax, %ebx
+
+bank1: movl (%edi), %eax
+ movl %eax, %ecx
+ andl $0x00008000, %ecx
+ jz bank0
+ andl $0x00007f00, %eax
+ shll $14, %eax
+ movl %eax, %ebx
+
+bank0: movl (%edi), %eax
+ movl %eax, %ecx
+ andl $0x00000080, %ecx
+ jz done
+ andl $0x0000007f, %eax
+ shll $22, %eax
+ movl %eax, %ebx
+
+
+done:
+ movl %ebx, %eax
+
+#if CONFIG_SYS_SDRAM_ECC_ENABLE
+ /* A nominal memory test: just a byte at each address line */
+ movl %eax, %ecx
+ shrl $0x1, %ecx
+ movl $0x1, %edi
+memtest0:
+ movb $0xa5, (%edi)
+ cmpb $0xa5, (%edi)
+ jne out
+ shrl $1, %ecx
+ andl %ecx,%ecx
+ jz set_ecc
+ shll $1, %edi
+ jmp memtest0
+
+set_ecc:
+ /* clear all ram with a memset */
+ movl %eax, %ecx
+ xorl %esi, %esi
+ xorl %edi, %edi
+ xorl %eax, %eax
+ shrl $2, %ecx
+ cld
+ rep stosl
+ /* enable read, write buffers */
+ movb $0x11, %al
+ movl $DBCTL, %edi
+ movb %al, (%edi)
+ /* enable NMI mapping for ECC */
+ movl $ECCINT, %edi
+ mov $0x10, %al
+ movb %al, (%edi)
+ /* Turn on ECC */
+ movl $ECCCTL, %edi
+ mov $0x05, %al
+ movb %al, (%edi)
+#endif
+out:
+ movl %ebx, %eax
+ jmp *%ebp
diff --git a/arch/i386/cpu/sc520/sc520_pci.c b/arch/i386/cpu/sc520/sc520_pci.c
new file mode 100644
index 0000000..f446c6d
--- /dev/null
+++ b/arch/i386/cpu/sc520/sc520_pci.c
@@ -0,0 +1,171 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520, but independent of implementation */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/pci.h>
+#include <asm/ic/sc520.h>
+
+static struct {
+ u8 priority;
+ u16 level_reg;
+ u8 level_bit;
+} sc520_irq[] = {
+ { SC520_IRQ0, 0, 0x01 },
+ { SC520_IRQ1, 0, 0x02 },
+ { SC520_IRQ2, 1, 0x02 },
+ { SC520_IRQ3, 0, 0x08 },
+ { SC520_IRQ4, 0, 0x10 },
+ { SC520_IRQ5, 0, 0x20 },
+ { SC520_IRQ6, 0, 0x40 },
+ { SC520_IRQ7, 0, 0x80 },
+
+ { SC520_IRQ8, 1, 0x01 },
+ { SC520_IRQ9, 1, 0x02 },
+ { SC520_IRQ10, 1, 0x04 },
+ { SC520_IRQ11, 1, 0x08 },
+ { SC520_IRQ12, 1, 0x10 },
+ { SC520_IRQ13, 1, 0x20 },
+ { SC520_IRQ14, 1, 0x40 },
+ { SC520_IRQ15, 1, 0x80 }
+};
+
+
+/* The interrupt used for PCI INTA-INTD */
+int sc520_pci_ints[15] = {
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1
+};
+
+/* utility function to configure a pci interrupt */
+int pci_sc520_set_irq(int pci_pin, int irq)
+{
+ int i;
+
+# if 1
+ printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
+#endif
+ if (irq < 0 || irq > 15) {
+ return -1; /* illegal irq */
+ }
+
+ if (pci_pin < 0 || pci_pin > 15) {
+ return -1; /* illegal pci int pin */
+ }
+
+ /* first disable any non-pci interrupt source that use
+ * this level */
+
+ /* PCI interrupt mapping (A through D)*/
+ for (i=0; i<=3 ;i++) {
+ if (sc520_mmcr->pci_int_map[i] == sc520_irq[irq].priority)
+ sc520_mmcr->pci_int_map[i] = SC520_IRQ_DISABLED;
+ }
+
+ /* GP IRQ interrupt mapping */
+ for (i=0; i<=10 ;i++) {
+ if (sc520_mmcr->gp_int_map[i] == sc520_irq[irq].priority)
+ sc520_mmcr->gp_int_map[i] = SC520_IRQ_DISABLED;
+ }
+
+ /* Set the trigger to level */
+ sc520_mmcr->pic_mode[sc520_irq[irq].level_reg] =
+ sc520_mmcr->pic_mode[sc520_irq[irq].level_reg] | sc520_irq[irq].level_bit;
+
+
+ if (pci_pin < 4) {
+ /* PCI INTA-INTD */
+ /* route the interrupt */
+ sc520_mmcr->pci_int_map[pci_pin] = sc520_irq[irq].priority;
+ } else {
+ /* GPIRQ0-GPIRQ10 used for additional PCI INTS */
+ sc520_mmcr->gp_int_map[pci_pin - 4] = sc520_irq[irq].priority;
+
+ /* also set the polarity in this case */
+ sc520_mmcr->intpinpol = sc520_mmcr->intpinpol | (1 << (pci_pin-4));
+ }
+
+ /* register the pin */
+ sc520_pci_ints[pci_pin] = irq;
+
+
+ return 0; /* OK */
+}
+
+void pci_sc520_init(struct pci_controller *hose)
+{
+ hose->first_busno = 0;
+ hose->last_busno = 0xff;
+
+ /* System memory space */
+ pci_set_region(hose->regions + 0,
+ SC520_PCI_MEMORY_BUS,
+ SC520_PCI_MEMORY_PHYS,
+ SC520_PCI_MEMORY_SIZE,
+ PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+ /* PCI memory space */
+ pci_set_region(hose->regions + 1,
+ SC520_PCI_MEM_BUS,
+ SC520_PCI_MEM_PHYS,
+ SC520_PCI_MEM_SIZE,
+ PCI_REGION_MEM);
+
+ /* ISA/PCI memory space */
+ pci_set_region(hose->regions + 2,
+ SC520_ISA_MEM_BUS,
+ SC520_ISA_MEM_PHYS,
+ SC520_ISA_MEM_SIZE,
+ PCI_REGION_MEM);
+
+ /* PCI I/O space */
+ pci_set_region(hose->regions + 3,
+ SC520_PCI_IO_BUS,
+ SC520_PCI_IO_PHYS,
+ SC520_PCI_IO_SIZE,
+ PCI_REGION_IO);
+
+ /* ISA/PCI I/O space */
+ pci_set_region(hose->regions + 4,
+ SC520_ISA_IO_BUS,
+ SC520_ISA_IO_PHYS,
+ SC520_ISA_IO_SIZE,
+ PCI_REGION_IO);
+
+ hose->region_count = 5;
+
+ pci_setup_type1(hose,
+ SC520_REG_ADDR,
+ SC520_REG_DATA);
+
+ pci_register_hose(hose);
+
+ hose->last_busno = pci_hose_scan(hose);
+
+ /* enable target memory acceses on host brige */
+ pci_write_config_word(0, PCI_COMMAND,
+ PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+}
diff --git a/arch/i386/cpu/sc520/sc520_ssi.c b/arch/i386/cpu/sc520/sc520_ssi.c
new file mode 100644
index 0000000..8dbe17a
--- /dev/null
+++ b/arch/i386/cpu/sc520/sc520_ssi.c
@@ -0,0 +1,94 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520, but independent of implementation */
+
+#include <common.h>
+#include <asm/ic/ssi.h>
+#include <asm/ic/sc520.h>
+
+int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
+{
+ u8 temp=0;
+
+ if (freq >= 8192) {
+ temp |= CTL_CLK_SEL_4;
+ } else if (freq >= 4096) {
+ temp |= CTL_CLK_SEL_8;
+ } else if (freq >= 2048) {
+ temp |= CTL_CLK_SEL_16;
+ } else if (freq >= 1024) {
+ temp |= CTL_CLK_SEL_32;
+ } else if (freq >= 512) {
+ temp |= CTL_CLK_SEL_64;
+ } else if (freq >= 256) {
+ temp |= CTL_CLK_SEL_128;
+ } else if (freq >= 128) {
+ temp |= CTL_CLK_SEL_256;
+ } else {
+ temp |= CTL_CLK_SEL_512;
+ }
+
+ if (!lsb_first) {
+ temp |= MSBF_ENB;
+ }
+
+ if (inv_clock) {
+ temp |= CLK_INV_ENB;
+ }
+
+ if (inv_phase) {
+ temp |= PHS_INV_ENB;
+ }
+
+ sc520_mmcr->ssictl = temp;
+
+ return 0;
+}
+
+u8 ssi_txrx_byte(u8 data)
+{
+ sc520_mmcr->ssixmit = data;
+ while (sc520_mmcr->ssista & SSISTA_BSY);
+ sc520_mmcr->ssicmd = SSICMD_CMD_SEL_XMITRCV;
+ while (sc520_mmcr->ssista & SSISTA_BSY);
+
+ return sc520_mmcr->ssircv;
+}
+
+
+void ssi_tx_byte(u8 data)
+{
+ sc520_mmcr->ssixmit = data;
+ while (sc520_mmcr->ssista & SSISTA_BSY);
+ sc520_mmcr->ssicmd = SSICMD_CMD_SEL_XMIT;
+}
+
+u8 ssi_rx_byte(void)
+{
+ while (sc520_mmcr->ssista & SSISTA_BSY);
+ sc520_mmcr->ssicmd = SSICMD_CMD_SEL_RCV;
+ while (sc520_mmcr->ssista & SSISTA_BSY);
+
+ return sc520_mmcr->ssircv;
+}
diff --git a/arch/i386/cpu/sc520/sc520_timer.c b/arch/i386/cpu/sc520/sc520_timer.c
new file mode 100644
index 0000000..93b5b55
--- /dev/null
+++ b/arch/i386/cpu/sc520/sc520_timer.c
@@ -0,0 +1,84 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520, but independent of implementation */
+
+#include <common.h>
+#include <asm/interrupt.h>
+#include <asm/ic/sc520.h>
+
+void sc520_timer_isr(void)
+{
+ /* Ack the GP Timer Interrupt */
+ sc520_mmcr->gptmrsta = 0x02;
+}
+
+int timer_init(void)
+{
+ /* Register the SC520 specific timer interrupt handler */
+ register_timer_isr (sc520_timer_isr);
+
+ /* Install interrupt handler for GP Timer 1 */
+ irq_install_handler (0, timer_isr, NULL);
+
+ /* Map GP Timer 1 to Master PIC IR0 */
+ sc520_mmcr->gp_tmr_int_map[1] = 0x01;
+
+ /* Disable GP Timers 1 & 2 - Allow configuration writes */
+ sc520_mmcr->gptmr1ctl = 0x4000;
+ sc520_mmcr->gptmr2ctl = 0x4000;
+
+ /* Reset GP Timers 1 & 2 */
+ sc520_mmcr->gptmr1cnt = 0x0000;
+ sc520_mmcr->gptmr2cnt = 0x0000;
+
+ /* Setup GP Timer 2 as a 100kHz (10us) prescaler */
+ sc520_mmcr->gptmr2maxcmpa = 83;
+ sc520_mmcr->gptmr2ctl = 0xc001;
+
+ /* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
+ sc520_mmcr->gptmr1maxcmpa = 100;
+ sc520_mmcr->gptmr1ctl = 0xe009;
+
+ unmask_irq (0);
+
+ /* Clear the GP Timer 1 status register to get the show rolling*/
+ sc520_mmcr->gptmrsta = 0x02;
+
+ return 0;
+}
+
+void __udelay(unsigned long usec)
+{
+ int m = 0;
+ long u;
+ long temp;
+
+ temp = sc520_mmcr->swtmrmilli;
+ temp = sc520_mmcr->swtmrmicro;
+
+ do {
+ m += sc520_mmcr->swtmrmilli;
+ u = sc520_mmcr->swtmrmicro + (m * 1000);
+ } while (u < usec);
+}
diff --git a/arch/i386/cpu/serial.c b/arch/i386/cpu/serial.c
new file mode 100644
index 0000000..e7025a3
--- /dev/null
+++ b/arch/i386/cpu/serial.c
@@ -0,0 +1,506 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+/*------------------------------------------------------------------------------+ */
+
+/*
+ * This source code is dual-licensed. You may use it under the terms of the
+ * GNU General Public License version 2, or under the license below.
+ *
+ * This source code has been made available to you by IBM on an AS-IS
+ * basis. Anyone receiving this source is licensed under IBM
+ * copyrights to use it in any way he or she deems fit, including
+ * copying it, modifying it, compiling it, and redistributing it either
+ * with or without modifications. No license under IBM patents or
+ * patent applications is to be implied by the copyright license.
+ *
+ * Any user of this software should understand that IBM cannot provide
+ * technical support for this software and will not be responsible for
+ * any consequences resulting from the use of this software.
+ *
+ * Any person who transfers this source code or any derivative work
+ * must include the IBM copyright notice, this paragraph, and the
+ * preceding two paragraphs in the transferred software.
+ *
+ * COPYRIGHT I B M CORPORATION 1995
+ * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
+ */
+/*------------------------------------------------------------------------------- */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <asm/ibmpc.h>
+
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+#include <malloc.h>
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define UART_RBR 0x00
+#define UART_THR 0x00
+#define UART_IER 0x01
+#define UART_IIR 0x02
+#define UART_FCR 0x02
+#define UART_LCR 0x03
+#define UART_MCR 0x04
+#define UART_LSR 0x05
+#define UART_MSR 0x06
+#define UART_SCR 0x07
+#define UART_DLL 0x00
+#define UART_DLM 0x01
+
+/*-----------------------------------------------------------------------------+
+ | Line Status Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncLSRDataReady1 0x01
+#define asyncLSROverrunError1 0x02
+#define asyncLSRParityError1 0x04
+#define asyncLSRFramingError1 0x08
+#define asyncLSRBreakInterrupt1 0x10
+#define asyncLSRTxHoldEmpty1 0x20
+#define asyncLSRTxShiftEmpty1 0x40
+#define asyncLSRRxFifoError1 0x80
+
+
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+/*-----------------------------------------------------------------------------+
+ | Fifo
+ +-----------------------------------------------------------------------------*/
+typedef struct {
+ char *rx_buffer;
+ ulong rx_put;
+ ulong rx_get;
+ int cts;
+} serial_buffer_t;
+
+volatile serial_buffer_t buf_info;
+static int serial_buffer_active=0;
+#endif
+
+
+static int serial_div(int baudrate)
+{
+
+ switch (baudrate) {
+ case 1200:
+ return 96;
+ case 9600:
+ return 12;
+ case 19200:
+ return 6;
+ case 38400:
+ return 3;
+ case 57600:
+ return 2;
+ case 115200:
+ return 1;
+ }
+
+ return 12;
+}
+
+
+/*
+ * Minimal serial functions needed to use one of the SMC ports
+ * as serial console interface.
+ */
+
+int serial_init(void)
+{
+ volatile char val;
+ int bdiv = serial_div(gd->baudrate);
+
+ outb(0x80, UART0_BASE + UART_LCR); /* set DLAB bit */
+ outb(bdiv, UART0_BASE + UART_DLL); /* set baudrate divisor */
+ outb(bdiv >> 8, UART0_BASE + UART_DLM);/* set baudrate divisor */
+ outb(0x03, UART0_BASE + UART_LCR); /* clear DLAB; set 8 bits, no parity */
+ outb(0x01, UART0_BASE + UART_FCR); /* enable FIFO */
+ outb(0x0b, UART0_BASE + UART_MCR); /* Set DTR and RTS active */
+ val = inb(UART0_BASE + UART_LSR); /* clear line status */
+ val = inb(UART0_BASE + UART_RBR); /* read receive buffer */
+ outb(0x00, UART0_BASE + UART_SCR); /* set scratchpad */
+ outb(0x00, UART0_BASE + UART_IER); /* set interrupt enable reg */
+
+ return 0;
+}
+
+
+void serial_setbrg(void)
+{
+ unsigned short bdiv;
+
+ bdiv = serial_div(gd->baudrate);
+
+ outb(0x80, UART0_BASE + UART_LCR); /* set DLAB bit */
+ outb(bdiv&0xff, UART0_BASE + UART_DLL); /* set baudrate divisor */
+ outb(bdiv >> 8, UART0_BASE + UART_DLM);/* set baudrate divisor */
+ outb(0x03, UART0_BASE + UART_LCR); /* clear DLAB; set 8 bits, no parity */
+}
+
+
+void serial_putc(const char c)
+{
+ int i;
+
+ if (c == '\n')
+ serial_putc ('\r');
+
+ /* check THRE bit, wait for transmiter available */
+ for (i = 1; i < 3500; i++) {
+ if ((inb (UART0_BASE + UART_LSR) & 0x20) == 0x20) {
+ break;
+ }
+ udelay(100);
+ }
+ outb(c, UART0_BASE + UART_THR); /* put character out */
+}
+
+
+void serial_puts(const char *s)
+{
+ while (*s) {
+ serial_putc(*s++);
+ }
+}
+
+
+int serial_getc(void)
+{
+ unsigned char status = 0;
+
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+ if (serial_buffer_active) {
+ return serial_buffered_getc();
+ }
+#endif
+
+ while (1) {
+#if defined(CONFIG_HW_WATCHDOG)
+ WATCHDOG_RESET(); /* Reset HW Watchdog, if needed */
+#endif /* CONFIG_HW_WATCHDOG */
+ status = inb(UART0_BASE + UART_LSR);
+ if ((status & asyncLSRDataReady1) != 0x0) {
+ break;
+ }
+ if ((status & ( asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1 )) != 0) {
+ outb(asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1, UART0_BASE + UART_LSR);
+ }
+ }
+ return (0x000000ff & (int) inb (UART0_BASE));
+}
+
+
+int serial_tstc(void)
+{
+ unsigned char status;
+
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+ if (serial_buffer_active) {
+ return serial_buffered_tstc();
+ }
+#endif
+
+ status = inb(UART0_BASE + UART_LSR);
+ if ((status & asyncLSRDataReady1) != 0x0) {
+ return (1);
+ }
+ if ((status & ( asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1 )) != 0) {
+ outb(asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1, UART0_BASE + UART_LSR);
+ }
+ return 0;
+}
+
+
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+
+void serial_isr(void *arg)
+{
+ int space;
+ int c;
+ int rx_put = buf_info.rx_put;
+
+ if (buf_info.rx_get <= rx_put) {
+ space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - buf_info.rx_get);
+ } else {
+ space = buf_info.rx_get - rx_put;
+ }
+
+ while (inb(UART0_BASE + UART_LSR) & 1) {
+ c = inb(UART0_BASE);
+ if (space) {
+ buf_info.rx_buffer[rx_put++] = c;
+ space--;
+
+ if (rx_put == buf_info.rx_get) {
+ buf_info.rx_get++;
+ if (rx_put == CONFIG_SERIAL_SOFTWARE_FIFO) {
+ buf_info.rx_get = 0;
+ }
+ }
+
+ if (rx_put == CONFIG_SERIAL_SOFTWARE_FIFO) {
+ rx_put = 0;
+ if (0 == buf_info.rx_get) {
+ buf_info.rx_get = 1;
+ }
+
+ }
+
+ }
+ if (space < CONFIG_SERIAL_SOFTWARE_FIFO / 4) {
+ /* Stop flow by setting RTS inactive */
+ outb(inb(UART0_BASE + UART_MCR) & (0xFF ^ 0x02),
+ UART0_BASE + UART_MCR);
+ }
+ }
+ buf_info.rx_put = rx_put;
+}
+
+void serial_buffered_init(void)
+{
+ serial_puts ("Switching to interrupt driven serial input mode.\n");
+ buf_info.rx_buffer = malloc (CONFIG_SERIAL_SOFTWARE_FIFO);
+ buf_info.rx_put = 0;
+ buf_info.rx_get = 0;
+
+ if (inb (UART0_BASE + UART_MSR) & 0x10) {
+ serial_puts ("Check CTS signal present on serial port: OK.\n");
+ buf_info.cts = 1;
+ } else {
+ serial_puts ("WARNING: CTS signal not present on serial port.\n");
+ buf_info.cts = 0;
+ }
+
+ irq_install_handler ( VECNUM_U0 /*UART0 */ /*int vec */ ,
+ serial_isr /*interrupt_handler_t *handler */ ,
+ (void *) &buf_info /*void *arg */ );
+
+ /* Enable "RX Data Available" Interrupt on UART */
+ /* outb(inb(UART0_BASE + UART_IER) |0x01, UART0_BASE + UART_IER); */
+ outb(0x01, UART0_BASE + UART_IER);
+
+ /* Set DTR and RTS active, enable interrupts */
+ outb(inb (UART0_BASE + UART_MCR) | 0x0b, UART0_BASE + UART_MCR);
+
+ /* Setup UART FIFO: RX trigger level: 1 byte, Enable FIFO */
+ outb( /*(1 << 6) |*/ 1, UART0_BASE + UART_FCR);
+
+ serial_buffer_active = 1;
+}
+
+void serial_buffered_putc (const char c)
+{
+ int i;
+ /* Wait for CTS */
+#if defined(CONFIG_HW_WATCHDOG)
+ while (!(inb (UART0_BASE + UART_MSR) & 0x10))
+ WATCHDOG_RESET ();
+#else
+ if (buf_info.cts) {
+ for (i=0;i<1000;i++) {
+ if ((inb (UART0_BASE + UART_MSR) & 0x10)) {
+ break;
+ }
+ }
+ if (i!=1000) {
+ buf_info.cts = 0;
+ }
+ } else {
+ if ((inb (UART0_BASE + UART_MSR) & 0x10)) {
+ buf_info.cts = 1;
+ }
+ }
+
+#endif
+ serial_putc (c);
+}
+
+void serial_buffered_puts(const char *s)
+{
+ serial_puts (s);
+}
+
+int serial_buffered_getc(void)
+{
+ int space;
+ int c;
+ int rx_get = buf_info.rx_get;
+ int rx_put;
+
+#if defined(CONFIG_HW_WATCHDOG)
+ while (rx_get == buf_info.rx_put)
+ WATCHDOG_RESET ();
+#else
+ while (rx_get == buf_info.rx_put);
+#endif
+ c = buf_info.rx_buffer[rx_get++];
+ if (rx_get == CONFIG_SERIAL_SOFTWARE_FIFO) {
+ rx_get = 0;
+ }
+ buf_info.rx_get = rx_get;
+
+ rx_put = buf_info.rx_put;
+ if (rx_get <= rx_put) {
+ space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - rx_get);
+ } else {
+ space = rx_get - rx_put;
+ }
+ if (space > CONFIG_SERIAL_SOFTWARE_FIFO / 2) {
+ /* Start flow by setting RTS active */
+ outb(inb (UART0_BASE + UART_MCR) | 0x02, UART0_BASE + UART_MCR);
+ }
+
+ return c;
+}
+
+int serial_buffered_tstc(void)
+{
+ return (buf_info.rx_get != buf_info.rx_put) ? 1 : 0;
+}
+
+#endif /* CONFIG_SERIAL_SOFTWARE_FIFO */
+
+
+#if defined(CONFIG_CMD_KGDB)
+/*
+ AS HARNOIS : according to CONFIG_KGDB_SER_INDEX kgdb uses serial port
+ number 0 or number 1
+ - if CONFIG_KGDB_SER_INDEX = 1 => serial port number 0 :
+ configuration has been already done
+ - if CONFIG_KGDB_SER_INDEX = 2 => serial port number 1 :
+ configure port 1 for serial I/O with rate = CONFIG_KGDB_BAUDRATE
+*/
+#if (CONFIG_KGDB_SER_INDEX & 2)
+void kgdb_serial_init(void)
+{
+ volatile char val;
+ bdiv = serial_div (CONFIG_KGDB_BAUDRATE);
+
+ /*
+ * Init onboard 16550 UART
+ */
+ outb(0x80, UART1_BASE + UART_LCR); /* set DLAB bit */
+ outb((bdiv & 0xff), UART1_BASE + UART_DLL); /* set divisor for 9600 baud */
+ outb((bdiv >> 8 ), UART1_BASE + UART_DLM); /* set divisor for 9600 baud */
+ outb(0x03, UART1_BASE + UART_LCR); /* line control 8 bits no parity */
+ outb(0x00, UART1_BASE + UART_FCR); /* disable FIFO */
+ outb(0x00, UART1_BASE + UART_MCR); /* no modem control DTR RTS */
+ val = inb(UART1_BASE + UART_LSR); /* clear line status */
+ val = inb(UART1_BASE + UART_RBR); /* read receive buffer */
+ outb(0x00, UART1_BASE + UART_SCR); /* set scratchpad */
+ outb(0x00, UART1_BASE + UART_IER); /* set interrupt enable reg */
+}
+
+
+void putDebugChar(const char c)
+{
+ if (c == '\n')
+ serial_putc ('\r');
+
+ outb(c, UART1_BASE + UART_THR); /* put character out */
+
+ /* check THRE bit, wait for transfer done */
+ while ((inb(UART1_BASE + UART_LSR) & 0x20) != 0x20);
+}
+
+
+void putDebugStr(const char *s)
+{
+ while (*s) {
+ serial_putc(*s++);
+ }
+}
+
+
+int getDebugChar(void)
+{
+ unsigned char status = 0;
+
+ while (1) {
+ status = inb(UART1_BASE + UART_LSR);
+ if ((status & asyncLSRDataReady1) != 0x0) {
+ break;
+ }
+ if ((status & ( asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1 )) != 0) {
+ outb(asyncLSRFramingError1 |
+ asyncLSROverrunError1 |
+ asyncLSRParityError1 |
+ asyncLSRBreakInterrupt1, UART1_BASE + UART_LSR);
+ }
+ }
+ return (0x000000ff & (int) inb(UART1_BASE));
+}
+
+
+void kgdb_interruptible(int yes)
+{
+ return;
+}
+
+#else /* ! (CONFIG_KGDB_SER_INDEX & 2) */
+
+void kgdb_serial_init(void)
+{
+ serial_printf ("[on serial] ");
+}
+
+void putDebugChar(int c)
+{
+ serial_putc (c);
+}
+
+void putDebugStr(const char *str)
+{
+ serial_puts (str);
+}
+
+int getDebugChar(void)
+{
+ return serial_getc ();
+}
+
+void kgdb_interruptible(int yes)
+{
+ return;
+}
+#endif /* (CONFIG_KGDB_SER_INDEX & 2) */
+#endif
diff --git a/arch/i386/cpu/start.S b/arch/i386/cpu/start.S
new file mode 100644
index 0000000..25d32e6
--- /dev/null
+++ b/arch/i386/cpu/start.S
@@ -0,0 +1,135 @@
+/*
+ * U-boot - i386 Startup Code
+ *
+ * Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#include <config.h>
+#include <version.h>
+
+
+.section .text
+.code32
+.globl _start
+.type _start, @function
+.globl _i386boot_start
+_i386boot_start:
+_start:
+ movl $0x18,%eax /* Load our segement registes, the
+ * gdt have already been loaded by start16.S */
+ movw %ax,%fs
+ movw %ax,%ds
+ movw %ax,%gs
+ movw %ax,%es
+ movw %ax,%ss
+
+ /* We call a few functions in the board support package
+ * since we have no stack yet we'll have to use %ebp
+ * to store the return address */
+
+ /* Early platform init (setup gpio, etc ) */
+ mov $early_board_init_ret, %ebp
+ jmp early_board_init
+early_board_init_ret:
+
+ /* The __port80 entry-point should be usabe by now */
+ /* so we try to indicate progress */
+ movw $0x01, %ax
+ movl $.progress0, %ebp
+ jmp show_boot_progress_asm
+.progress0:
+
+ /* size memory */
+ mov $mem_init_ret, %ebp
+ jmp mem_init
+mem_init_ret:
+
+ /* Check we have enough memory for stack */
+ movl $CONFIG_SYS_STACK_SIZE, %ecx
+ cmpl %ecx, %eax
+ jae mem_ok
+
+ /* indicate (lack of) progress */
+ movw $0x81, %ax
+ movl $.progress0a, %ebp
+ jmp show_boot_progress_asm
+.progress0a:
+ jmp die
+mem_ok:
+ /* Set stack pointer to upper memory limit*/
+ movl %eax, %esp
+
+ /* indicate progress */
+ movw $0x02, %ax
+ movl $.progress1, %ebp
+ jmp show_boot_progress_asm
+.progress1:
+
+ /* Test the stack */
+ pushl $0
+ popl %eax
+ cmpl $0, %eax
+ jne no_stack
+ push $0x55aa55aa
+ popl %ebx
+ cmpl $0x55aa55aa, %ebx
+ je stack_ok
+
+no_stack:
+ /* indicate (lack of) progress */
+ movw $0x82, %ax
+ movl $.progress1a, %ebp
+ jmp show_boot_progress_asm
+.progress1a:
+ jmp die
+
+
+stack_ok:
+ /* indicate progress */
+ movw $0x03, %ax
+ movl $.progress2, %ebp
+ jmp show_boot_progress_asm
+.progress2:
+
+ wbinvd
+
+ /* Get upper memory limit */
+ movl %esp, %ecx
+ subl $CONFIG_SYS_STACK_SIZE, %ecx
+
+ /* Create a Stack Frame */
+ pushl %ebp
+ movl %esp, %ebp
+
+ /* stack_limit parameter */
+ pushl %ecx
+ call board_init_f /* Enter, U-boot! */
+
+ /* indicate (lack of) progress */
+ movw $0x85, %ax
+ movl $.progress4a, %ebp
+ jmp show_boot_progress_asm
+.progress4a:
+
+die: hlt
+ jmp die
+ hlt
diff --git a/arch/i386/cpu/start16.S b/arch/i386/cpu/start16.S
new file mode 100644
index 0000000..1ebb6bc
--- /dev/null
+++ b/arch/i386/cpu/start16.S
@@ -0,0 +1,112 @@
+/*
+ * U-boot - i386 Startup Code
+ *
+ * Copyright (c) 2002, 2003 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#define BOOT_SEG 0xffff0000 /* linear segment of boot code */
+#define a32 .byte 0x67;
+#define o32 .byte 0x66;
+
+.section .start16, "ax"
+.code16
+.globl start16
+start16:
+ /* First we let the BSP do some early initialization
+ * this code have to map the flash to its final position
+ */
+ mov $board_init16_ret, %bp
+ jmp board_init16
+board_init16_ret:
+
+ /* Turn of cache (this might require a 486-class CPU) */
+ movl %cr0, %eax
+ orl $0x60000000,%eax
+ movl %eax, %cr0
+ wbinvd
+
+ /* load the descriptor tables */
+o32 cs lidt idt_ptr
+o32 cs lgdt gdt_ptr
+
+
+ /* Now, we enter protected mode */
+ movl %cr0, %eax
+ orl $1,%eax
+ movl %eax, %cr0
+
+ /* Flush the prefetch queue */
+ jmp ff
+ff:
+
+ /* Finally jump to the 32bit initialization code */
+ movw $code32start, %ax
+ movw %ax,%bp
+o32 cs ljmp *(%bp)
+
+ /* 48-bit far pointer */
+code32start:
+ .long _start /* offset */
+ .word 0x10 /* segment */
+
+idt_ptr:
+ .word 0 /* limit */
+ .long 0 /* base */
+
+gdt_ptr:
+ .word 0x30 /* limit (48 bytes = 6 GDT entries) */
+ .long BOOT_SEG + gdt /* base */
+
+ /* The GDT table ...
+ *
+ * Selector Type
+ * 0x00 NULL
+ * 0x08 Unused
+ * 0x10 32bit code
+ * 0x18 32bit data/stack
+ * 0x20 16bit code
+ * 0x28 16bit data/stack
+ */
+
+gdt:
+ .word 0, 0, 0, 0 /* NULL */
+ .word 0, 0, 0, 0 /* unused */
+
+ .word 0xFFFF /* 4Gb - (0x100000*0x1000 = 4Gb) */
+ .word 0 /* base address = 0 */
+ .word 0x9B00 /* code read/exec */
+ .word 0x00CF /* granularity = 4096, 386 (+5th nibble of limit) */
+
+ .word 0xFFFF /* 4Gb - (0x100000*0x1000 = 4Gb) */
+ .word 0x0 /* base address = 0 */
+ .word 0x9300 /* data read/write */
+ .word 0x00CF /* granularity = 4096, 386 (+5th nibble of limit) */
+
+ .word 0xFFFF /* 64kb */
+ .word 0 /* base address = 0 */
+ .word 0x9b00 /* data read/write */
+ .word 0x0010 /* granularity = 1 (+5th nibble of limit) */
+
+ .word 0xFFFF /* 64kb */
+ .word 0 /* base address = 0 */
+ .word 0x9300 /* data read/write */
+ .word 0x0010 /* granularity = 1 (+5th nibble of limit) */
generated by cgit v1.1 at 2024-12-20 01:40:44 +0000