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 size in u64 units (exgen, exmc, etc) */ 40 #if defined(CONFIG_RELOCATABLE) 41 #define EX_SIZE 10 42 #else 43 #define EX_SIZE 9 44 #endif 45 46 /* 47 * maximum recursive depth of MCE exceptions 48 */ 49 #define MAX_MCE_DEPTH 4 50 51 /* 52 * EX_R3 is only used by the bad_stack handler. bad_stack reloads and 53 * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap 54 * with EX_DAR. 55 */ 56 #define EX_R3 EX_DAR 57 58 #ifdef __ASSEMBLY__ 59 60 #define STF_ENTRY_BARRIER_SLOT \ 61 STF_ENTRY_BARRIER_FIXUP_SECTION; \ 62 nop; \ 63 nop; \ 64 nop 65 66 #define STF_EXIT_BARRIER_SLOT \ 67 STF_EXIT_BARRIER_FIXUP_SECTION; \ 68 nop; \ 69 nop; \ 70 nop; \ 71 nop; \ 72 nop; \ 73 nop 74 75 /* 76 * r10 must be free to use, r13 must be paca 77 */ 78 #define INTERRUPT_TO_KERNEL \ 79 STF_ENTRY_BARRIER_SLOT 80 81 /* 82 * Macros for annotating the expected destination of (h)rfid 83 * 84 * The nop instructions allow us to insert one or more instructions to flush the 85 * L1-D cache when returning to userspace or a guest. 86 */ 87 #define RFI_FLUSH_SLOT \ 88 RFI_FLUSH_FIXUP_SECTION; \ 89 nop; \ 90 nop; \ 91 nop 92 93 #define RFI_TO_KERNEL \ 94 rfid 95 96 #define RFI_TO_USER \ 97 STF_EXIT_BARRIER_SLOT; \ 98 RFI_FLUSH_SLOT; \ 99 rfid; \ 100 b rfi_flush_fallback 101 102 #define RFI_TO_USER_OR_KERNEL \ 103 STF_EXIT_BARRIER_SLOT; \ 104 RFI_FLUSH_SLOT; \ 105 rfid; \ 106 b rfi_flush_fallback 107 108 #define RFI_TO_GUEST \ 109 STF_EXIT_BARRIER_SLOT; \ 110 RFI_FLUSH_SLOT; \ 111 rfid; \ 112 b rfi_flush_fallback 113 114 #define HRFI_TO_KERNEL \ 115 hrfid 116 117 #define HRFI_TO_USER \ 118 STF_EXIT_BARRIER_SLOT; \ 119 RFI_FLUSH_SLOT; \ 120 hrfid; \ 121 b hrfi_flush_fallback 122 123 #define HRFI_TO_USER_OR_KERNEL \ 124 STF_EXIT_BARRIER_SLOT; \ 125 RFI_FLUSH_SLOT; \ 126 hrfid; \ 127 b hrfi_flush_fallback 128 129 #define HRFI_TO_GUEST \ 130 STF_EXIT_BARRIER_SLOT; \ 131 RFI_FLUSH_SLOT; \ 132 hrfid; \ 133 b hrfi_flush_fallback 134 135 #define HRFI_TO_UNKNOWN \ 136 STF_EXIT_BARRIER_SLOT; \ 137 RFI_FLUSH_SLOT; \ 138 hrfid; \ 139 b hrfi_flush_fallback 140 141 #endif /* __ASSEMBLY__ */ 142 143 #endif /* _ASM_POWERPC_EXCEPTION_H */ 144