summaryrefslogtreecommitdiff
path: root/cpu/i386/exceptions.c
diff options
context:
space:
mode:
authorGraeme Russ <graeme.russ@gmail.com>2009-02-24 21:13:40 +1100
committerWolfgang Denk <wd@denx.de>2009-03-20 22:39:13 +0100
commitabf0cd3dff227cfb6e82ad13be62e28e6e89d5df (patch)
tree40d66a99e64a918c339cd0b197d3f67bb00ac8b7 /cpu/i386/exceptions.c
parentece444b42b71eb5bce34a24ec584573b3c8c4a98 (diff)
downloadu-boot-imx-abf0cd3dff227cfb6e82ad13be62e28e6e89d5df.zip
u-boot-imx-abf0cd3dff227cfb6e82ad13be62e28e6e89d5df.tar.gz
u-boot-imx-abf0cd3dff227cfb6e82ad13be62e28e6e89d5df.tar.bz2
Rewrite i386 interrupt handling
Rewrite interrupt handling functionality for the i386 port. Separated functionality into separate CPU and Architecture components. It appears as if the i386 interrupt handler functionality was intended to allow multiple handlers to be installed for a given interrupt. Unfortunately, this functionality was not fully implemented and also had the problem that irq_free_handler() does not allow the passing of the handler function pointer and therefore could never be used to free specific handlers that had been installed for a given IRQ. There were also various issues with array bounds not being fully tested. I had two objectives in mind for the new implementation: 1) Keep the implementation as similar as possible to existing implementations. To that end, I have used the leon2/3 implementations as the reference 2) Seperate CPU and Architecture specific elements. All specific i386 interrupt functionality is now in cpu/i386/ with the high level API and architecture specific code in lib_i386. Functionality specific to the PC/AT architecture (i.e. cascaded i8259 PICs) has been further split out into an individual file to allow for the implementation of the PIC architecture of the SC520 CPU (supports more IRQs) Signed-off-by: Graeme Russ <graeme.russ at gmail.com>
Diffstat (limited to 'cpu/i386/exceptions.c')
-rw-r--r--cpu/i386/exceptions.c229
1 files changed, 229 insertions, 0 deletions
diff --git a/cpu/i386/exceptions.c b/cpu/i386/exceptions.c
new file mode 100644
index 0000000..bc3d434
--- /dev/null
+++ b/cpu/i386/exceptions.c
@@ -0,0 +1,229 @@
+/*
+ * (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>
+
+asm (".globl exp_return\n"
+ "exp_return:\n"
+ " addl $12, %esp\n"
+ " pop %esp\n"
+ " popa\n"
+ " iret\n");
+
+char exception_stack[4096];
+
+/*
+ * 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
+ */
+DECLARE_EXCEPTION(0, divide_error_entry);
+DECLARE_EXCEPTION(1, debug_entry);
+DECLARE_EXCEPTION(2, nmi_interrupt_entry);
+DECLARE_EXCEPTION(3, breakpoint_entry);
+DECLARE_EXCEPTION(4, overflow_entry);
+DECLARE_EXCEPTION(5, bound_range_exceeded_entry);
+DECLARE_EXCEPTION(6, invalid_opcode_entry);
+DECLARE_EXCEPTION(7, device_not_available_entry);
+DECLARE_EXCEPTION(8, double_fault_entry);
+DECLARE_EXCEPTION(9, coprocessor_segment_overrun_entry);
+DECLARE_EXCEPTION(10, invalid_tss_entry);
+DECLARE_EXCEPTION(11, segment_not_present_entry);
+DECLARE_EXCEPTION(12, stack_segment_fault_entry);
+DECLARE_EXCEPTION(13, general_protection_entry);
+DECLARE_EXCEPTION(14, page_fault_entry);
+DECLARE_EXCEPTION(15, reserved_exception_entry);
+DECLARE_EXCEPTION(16, floating_point_error_entry);
+DECLARE_EXCEPTION(17, alignment_check_entry);
+DECLARE_EXCEPTION(18, machine_check_entry);
+DECLARE_EXCEPTION(19, simd_floating_point_exception_entry);
+DECLARE_EXCEPTION(20, reserved_exception_entry);
+DECLARE_EXCEPTION(21, reserved_exception_entry);
+DECLARE_EXCEPTION(22, reserved_exception_entry);
+DECLARE_EXCEPTION(23, reserved_exception_entry);
+DECLARE_EXCEPTION(24, reserved_exception_entry);
+DECLARE_EXCEPTION(25, reserved_exception_entry);
+DECLARE_EXCEPTION(26, reserved_exception_entry);
+DECLARE_EXCEPTION(27, reserved_exception_entry);
+DECLARE_EXCEPTION(28, reserved_exception_entry);
+DECLARE_EXCEPTION(29, reserved_exception_entry);
+DECLARE_EXCEPTION(30, reserved_exception_entry);
+DECLARE_EXCEPTION(31, reserved_exception_entry);
+
+__isr__ reserved_exception_entry(int cause, int ip, int seg)
+{
+ printf("Reserved Exception %d at %04x:%08x\n", cause, seg, ip);
+}
+
+__isr__ divide_error_entry(int cause, int ip, int seg)
+{
+ printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ debug_entry(int cause, int ip, int seg)
+{
+ printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
+}
+
+__isr__ nmi_interrupt_entry(int cause, int ip, int seg)
+{
+ printf("NMI Interrupt at %04x:%08x\n", seg, ip);
+}
+
+__isr__ breakpoint_entry(int cause, int ip, int seg)
+{
+ printf("Breakpoint at %04x:%08x\n", seg, ip);
+}
+
+__isr__ overflow_entry(int cause, int ip, int seg)
+{
+ printf("Overflow at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ bound_range_exceeded_entry(int cause, int ip, int seg)
+{
+ printf("BOUND Range Exceeded at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ invalid_opcode_entry(int cause, int ip, int seg)
+{
+ printf("Invalid Opcode (UnDefined Opcode) at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ device_not_available_entry(int cause, int ip, int seg)
+{
+ printf("Device Not Available (No Math Coprocessor) at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ double_fault_entry(int cause, int ip, int seg)
+{
+ printf("Double fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ coprocessor_segment_overrun_entry(int cause, int ip, int seg)
+{
+ printf("Co-processor segment overrun at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ invalid_tss_entry(int cause, int ip, int seg)
+{
+ printf("Invalid TSS at %04x:%08x\n", seg, ip);
+}
+
+__isr__ segment_not_present_entry(int cause, int ip, int seg)
+{
+ printf("Segment Not Present at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ stack_segment_fault_entry(int cause, int ip, int seg)
+{
+ printf("Stack Segment Fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ general_protection_entry(int cause, int ip, int seg)
+{
+ printf("General Protection at %04x:%08x\n", seg, ip);
+}
+
+__isr__ page_fault_entry(int cause, int ip, int seg)
+{
+ printf("Page fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+__isr__ floating_point_error_entry(int cause, int ip, int seg)
+{
+ printf("Floating-Point Error (Math Fault) at %04x:%08x\n", seg, ip);
+}
+
+__isr__ alignment_check_entry(int cause, int ip, int seg)
+{
+ printf("Alignment check at %04x:%08x\n", seg, ip);
+}
+
+__isr__ machine_check_entry(int cause, int ip, int seg)
+{
+ printf("Machine Check at %04x:%08x\n", seg, ip);
+}
+
+__isr__ simd_floating_point_exception_entry(int cause, int ip, int seg)
+{
+ printf("SIMD Floating-Point Exception at %04x:%08x\n", seg, ip);
+}
+
+int cpu_init_exceptions(void)
+{
+ /* Just in case... */
+ disable_interrupts();
+
+ /* Setup exceptions */
+ set_vector(0x00, exp_0);
+ set_vector(0x01, exp_1);
+ set_vector(0x02, exp_2);
+ set_vector(0x03, exp_3);
+ set_vector(0x04, exp_4);
+ set_vector(0x05, exp_5);
+ set_vector(0x06, exp_6);
+ set_vector(0x07, exp_7);
+ set_vector(0x08, exp_8);
+ set_vector(0x09, exp_9);
+ set_vector(0x0a, exp_10);
+ set_vector(0x0b, exp_11);
+ set_vector(0x0c, exp_12);
+ set_vector(0x0d, exp_13);
+ set_vector(0x0e, exp_14);
+ set_vector(0x0f, exp_15);
+ set_vector(0x10, exp_16);
+ set_vector(0x11, exp_17);
+ set_vector(0x12, exp_18);
+ set_vector(0x13, exp_19);
+ set_vector(0x14, exp_20);
+ set_vector(0x15, exp_21);
+ set_vector(0x16, exp_22);
+ set_vector(0x17, exp_23);
+ set_vector(0x18, exp_24);
+ set_vector(0x19, exp_25);
+ set_vector(0x1a, exp_26);
+ set_vector(0x1b, exp_27);
+ set_vector(0x1c, exp_28);
+ set_vector(0x1d, exp_29);
+ set_vector(0x1e, exp_30);
+ set_vector(0x1f, exp_31);
+
+ /* It is now safe to enable interrupts */
+ enable_interrupts();
+
+ return 0;
+}