1 #ifndef _ASM_POWERPC_EXCEPTION_H 2 #define _ASM_POWERPC_EXCEPTION_H 3 /* 4 * Extracted from head_64.S 5 * 6 * PowerPC version 7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 8 * 9 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 10 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 11 * Adapted for Power Macintosh by Paul Mackerras. 12 * Low-level exception handlers and MMU support 13 * rewritten by Paul Mackerras. 14 * Copyright (C) 1996 Paul Mackerras. 15 * 16 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and 17 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com 18 * 19 * This file contains the low-level support and setup for the 20 * PowerPC-64 platform, including trap and interrupt dispatch. 21 * 22 * This program is free software; you can redistribute it and/or 23 * modify it under the terms of the GNU General Public License 24 * as published by the Free Software Foundation; either version 25 * 2 of the License, or (at your option) any later version. 26 */ 27 /* 28 * The following macros define the code that appears as 29 * the prologue to each of the exception handlers. They 30 * are split into two parts to allow a single kernel binary 31 * to be used for pSeries and iSeries. 32 * 33 * We make as much of the exception code common between native 34 * exception handlers (including pSeries LPAR) and iSeries LPAR 35 * implementations as possible. 36 */ 37 #include <asm/feature-fixups.h> 38 39 /* PACA save area offsets (exgen, exmc, etc) */ 40 #define EX_R9 0 41 #define EX_R10 8 42 #define EX_R11 16 43 #define EX_R12 24 44 #define EX_R13 32 45 #define EX_DAR 40 46 #define EX_DSISR 48 47 #define EX_CCR 52 48 #define EX_CFAR 56 49 #define EX_PPR 64 50 #if defined(CONFIG_RELOCATABLE) 51 #define EX_CTR 72 52 #define EX_SIZE 10 /* size in u64 units */ 53 #else 54 #define EX_SIZE 9 /* size in u64 units */ 55 #endif 56 57 /* 58 * maximum recursive depth of MCE exceptions 59 */ 60 #define MAX_MCE_DEPTH 4 61 62 /* 63 * EX_R3 is only used by the bad_stack handler. bad_stack reloads and 64 * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap 65 * with EX_DAR. 66 */ 67 #define EX_R3 EX_DAR 68 69 #ifdef __ASSEMBLY__ 70 71 #define STF_ENTRY_BARRIER_SLOT \ 72 STF_ENTRY_BARRIER_FIXUP_SECTION; \ 73 nop; \ 74 nop; \ 75 nop 76 77 #define STF_EXIT_BARRIER_SLOT \ 78 STF_EXIT_BARRIER_FIXUP_SECTION; \ 79 nop; \ 80 nop; \ 81 nop; \ 82 nop; \ 83 nop; \ 84 nop 85 86 /* 87 * r10 must be free to use, r13 must be paca 88 */ 89 #define INTERRUPT_TO_KERNEL \ 90 STF_ENTRY_BARRIER_SLOT 91 92 /* 93 * Macros for annotating the expected destination of (h)rfid 94 * 95 * The nop instructions allow us to insert one or more instructions to flush the 96 * L1-D cache when returning to userspace or a guest. 97 */ 98 #define RFI_FLUSH_SLOT \ 99 RFI_FLUSH_FIXUP_SECTION; \ 100 nop; \ 101 nop; \ 102 nop 103 104 #define RFI_TO_KERNEL \ 105 rfid 106 107 #define RFI_TO_USER \ 108 STF_EXIT_BARRIER_SLOT; \ 109 RFI_FLUSH_SLOT; \ 110 rfid; \ 111 b rfi_flush_fallback 112 113 #define RFI_TO_USER_OR_KERNEL \ 114 STF_EXIT_BARRIER_SLOT; \ 115 RFI_FLUSH_SLOT; \ 116 rfid; \ 117 b rfi_flush_fallback 118 119 #define RFI_TO_GUEST \ 120 STF_EXIT_BARRIER_SLOT; \ 121 RFI_FLUSH_SLOT; \ 122 rfid; \ 123 b rfi_flush_fallback 124 125 #define HRFI_TO_KERNEL \ 126 hrfid 127 128 #define HRFI_TO_USER \ 129 STF_EXIT_BARRIER_SLOT; \ 130 RFI_FLUSH_SLOT; \ 131 hrfid; \ 132 b hrfi_flush_fallback 133 134 #define HRFI_TO_USER_OR_KERNEL \ 135 STF_EXIT_BARRIER_SLOT; \ 136 RFI_FLUSH_SLOT; \ 137 hrfid; \ 138 b hrfi_flush_fallback 139 140 #define HRFI_TO_GUEST \ 141 STF_EXIT_BARRIER_SLOT; \ 142 RFI_FLUSH_SLOT; \ 143 hrfid; \ 144 b hrfi_flush_fallback 145 146 #define HRFI_TO_UNKNOWN \ 147 STF_EXIT_BARRIER_SLOT; \ 148 RFI_FLUSH_SLOT; \ 149 hrfid; \ 150 b hrfi_flush_fallback 151 152 #endif /* __ASSEMBLY__ */ 153 154 #endif /* _ASM_POWERPC_EXCEPTION_H */ 155