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+/*
+ * (C) Copyright 2000-2002
+ * 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 file contains all the macros and symbols which define
+ * a PowerPC assembly language environment.
+ */
+#ifndef __PPC_ASM_TMPL__
+#define __PPC_ASM_TMPL__
+
+/***************************************************************************
+ *
+ * These definitions simplify the ugly declarations necessary for GOT
+ * definitions.
+ *
+ * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
+ *
+ * Uses r14 to access the GOT
+ */
+
+#define START_GOT \
+ .section ".got2","aw"; \
+.LCTOC1 = .+32768
+
+#define END_GOT \
+ .text
+
+#define GET_GOT \
+ bl 1f ; \
+ .text 2 ; \
+0: .long .LCTOC1-1f ; \
+ .text ; \
+1: mflr r14 ; \
+ lwz r0,0b-1b(r14) ; \
+ add r14,r0,r14 ;
+
+#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
+
+#define GOT(NAME) .L_ ## NAME (r14)
+
+
+/***************************************************************************
+ * Register names
+ */
+#define r0 0
+#define r1 1
+#define r2 2
+#define r3 3
+#define r4 4
+#define r5 5
+#define r6 6
+#define r7 7
+#define r8 8
+#define r9 9
+#define r10 10
+#define r11 11
+#define r12 12
+#define r13 13
+#define r14 14
+#define r15 15
+#define r16 16
+#define r17 17
+#define r18 18
+#define r19 19
+#define r20 20
+#define r21 21
+#define r22 22
+#define r23 23
+#define r24 24
+#define r25 25
+#define r26 26
+#define r27 27
+#define r28 28
+#define r29 29
+#define r30 30
+#define r31 31
+
+
+#if defined(CONFIG_8xx) || defined(CONFIG_MPC824X)
+
+/* Some special registers */
+
+#define ICR 148 /* Interrupt Cause Register (37-44) */
+#define DER 149
+#define COUNTA 150 /* Breakpoint Counter (37-44) */
+#define COUNTB 151 /* Breakpoint Counter (37-44) */
+#define LCTRL1 156 /* Load/Store Support (37-40) */
+#define LCTRL2 157 /* Load/Store Support (37-41) */
+#define ICTRL 158
+
+#endif /* CONFIG_8xx, CONFIG_MPC824X */
+
+#if defined(CONFIG_8xx)
+
+/* Registers in the processor's internal memory map that we use.
+*/
+#define SYPCR 0x00000004
+#define BR0 0x00000100
+#define OR0 0x00000104
+#define BR1 0x00000108
+#define OR1 0x0000010c
+#define BR2 0x00000110
+#define OR2 0x00000114
+#define BR3 0x00000118
+#define OR3 0x0000011c
+#define BR4 0x00000120
+#define OR4 0x00000124
+
+#define MAR 0x00000164
+#define MCR 0x00000168
+#define MAMR 0x00000170
+#define MBMR 0x00000174
+#define MSTAT 0x00000178
+#define MPTPR 0x0000017a
+#define MDR 0x0000017c
+
+#define TBSCR 0x00000200
+#define TBREFF0 0x00000204
+
+#define PLPRCR 0x00000284
+
+#elif defined(CONFIG_8260)
+
+#define HID2 1011
+
+#define HID0_IFEM (1<<7)
+
+#define HID0_ICE_BITPOS 16
+#define HID0_DCE_BITPOS 17
+
+#define IM_REGBASE 0x10000
+#define IM_SYPCR (IM_REGBASE+0x0004)
+#define IM_SWSR (IM_REGBASE+0x000e)
+#define IM_BR0 (IM_REGBASE+0x0100)
+#define IM_OR0 (IM_REGBASE+0x0104)
+#define IM_BR1 (IM_REGBASE+0x0108)
+#define IM_OR1 (IM_REGBASE+0x010c)
+#define IM_BR2 (IM_REGBASE+0x0110)
+#define IM_OR2 (IM_REGBASE+0x0114)
+#define IM_MPTPR (IM_REGBASE+0x0184)
+#define IM_PSDMR (IM_REGBASE+0x0190)
+#define IM_PSRT (IM_REGBASE+0x019c)
+#define IM_IMMR (IM_REGBASE+0x01a8)
+#define IM_SCCR (IM_REGBASE+0x0c80)
+
+#endif
+
+#define curptr r2
+
+#define SYNC \
+ sync; \
+ isync
+
+/*
+ * Macros for storing registers into and loading registers from
+ * exception frames.
+ */
+#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
+#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
+#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
+#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
+#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
+#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
+#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
+#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
+#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
+#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
+
+/*
+ * GCC sometimes accesses words at negative offsets from the stack
+ * pointer, although the SysV ABI says it shouldn't. To cope with
+ * this, we leave this much untouched space on the stack on exception
+ * entry.
+ */
+#define STACK_UNDERHEAD 64
+
+/*
+ * Exception entry code. This code runs with address translation
+ * turned off, i.e. using physical addresses.
+ * We assume sprg3 has the physical address of the current
+ * task's thread_struct.
+ */
+#define EXCEPTION_PROLOG \
+ mtspr SPRG0,r20; \
+ mtspr SPRG1,r21; \
+ mfcr r20; \
+ subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
+ stw r20,_CCR(r21); /* save registers */ \
+ stw r22,GPR22(r21); \
+ stw r23,GPR23(r21); \
+ mfspr r20,SPRG0; \
+ stw r20,GPR20(r21); \
+ mfspr r22,SPRG1; \
+ stw r22,GPR21(r21); \
+ mflr r20; \
+ stw r20,_LINK(r21); \
+ mfctr r22; \
+ stw r22,_CTR(r21); \
+ mfspr r20,XER; \
+ stw r20,_XER(r21); \
+ mfspr r22,SRR0; \
+ mfspr r23,SRR1; \
+ stw r0,GPR0(r21); \
+ stw r1,GPR1(r21); \
+ stw r2,GPR2(r21); \
+ stw r1,0(r21); \
+ mr r1,r21; /* set new kernel sp */ \
+ SAVE_4GPRS(3, r21);
+/*
+ * Note: code which follows this uses cr0.eq (set if from kernel),
+ * r21, r22 (SRR0), and r23 (SRR1).
+ */
+
+/*
+ * Critical exception entry code. This is just like the other exception
+ * code except that it uses SRR2 and SRR3 instead of SRR0 and SRR1.
+ */
+#define CRITICAL_EXCEPTION_PROLOG \
+ mtspr SPRG0,r20; \
+ mtspr SPRG1,r21; \
+ mfcr r20; \
+ subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
+ stw r20,_CCR(r21); /* save registers */ \
+ stw r22,GPR22(r21); \
+ stw r23,GPR23(r21); \
+ mfspr r20,SPRG0; \
+ stw r20,GPR20(r21); \
+ mfspr r22,SPRG1; \
+ stw r22,GPR21(r21); \
+ mflr r20; \
+ stw r20,_LINK(r21); \
+ mfctr r22; \
+ stw r22,_CTR(r21); \
+ mfspr r20,XER; \
+ stw r20,_XER(r21); \
+ mfspr r22,990; /* SRR2 */ \
+ mfspr r23,991; /* SRR3 */ \
+ stw r0,GPR0(r21); \
+ stw r1,GPR1(r21); \
+ stw r2,GPR2(r21); \
+ stw r1,0(r21); \
+ mr r1,r21; /* set new kernel sp */ \
+ SAVE_4GPRS(3, r21);
+/*
+ * Note: code which follows this uses cr0.eq (set if from kernel),
+ * r21, r22 (SRR2), and r23 (SRR3).
+ */
+
+/*
+ * Exception vectors.
+ *
+ * The data words for `hdlr' and `int_return' are initialized with
+ * OFFSET values only; they must be relocated first before they can
+ * be used!
+ */
+#define STD_EXCEPTION(n, label, hdlr) \
+ . = n; \
+label: \
+ EXCEPTION_PROLOG; \
+ lwz r3,GOT(transfer_to_handler); \
+ mtlr r3; \
+ addi r3,r1,STACK_FRAME_OVERHEAD; \
+ li r20,MSR_KERNEL; \
+ rlwimi r20,r23,0,25,25; \
+ blrl ; \
+.L_ ## label : \
+ .long hdlr - _start + EXC_OFF_SYS_RESET; \
+ .long int_return - _start + EXC_OFF_SYS_RESET
+
+
+#define CRIT_EXCEPTION(n, label, hdlr) \
+ . = n; \
+label: \
+ CRITICAL_EXCEPTION_PROLOG; \
+ lwz r3,GOT(transfer_to_handler); \
+ mtlr r3; \
+ addi r3,r1,STACK_FRAME_OVERHEAD; \
+ li r20,MSR_KERNEL; \
+ rlwimi r20,r23,0,25,25; \
+ blrl ; \
+.L_ ## label : \
+ .long hdlr - _start + EXC_OFF_SYS_RESET; \
+ .long crit_return - _start + EXC_OFF_SYS_RESET
+
+#endif /* __PPC_ASM_TMPL__ */
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