1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_EXCEPTION_H 3 #define _ASM_POWERPC_EXCEPTION_H 4 /* 5 * Extracted from head_64.S 6 * 7 * PowerPC version 8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 9 * 10 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 11 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 12 * Adapted for Power Macintosh by Paul Mackerras. 13 * Low-level exception handlers and MMU support 14 * rewritten by Paul Mackerras. 15 * Copyright (C) 1996 Paul Mackerras. 16 * 17 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and 18 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com 19 * 20 * This file contains the low-level support and setup for the 21 * PowerPC-64 platform, including trap and interrupt dispatch. 22 */ 23 /* 24 * The following macros define the code that appears as 25 * the prologue to each of the exception handlers. They 26 * are split into two parts to allow a single kernel binary 27 * to be used for pSeries and iSeries. 28 * 29 * We make as much of the exception code common between native 30 * exception handlers (including pSeries LPAR) and iSeries LPAR 31 * implementations as possible. 32 */ 33 #include <asm/feature-fixups.h> 34 35 /* PACA save area size in u64 units (exgen, exmc, etc) */ 36 #if defined(CONFIG_RELOCATABLE) 37 #define EX_SIZE 10 38 #else 39 #define EX_SIZE 9 40 #endif 41 42 /* 43 * maximum recursive depth of MCE exceptions 44 */ 45 #define MAX_MCE_DEPTH 4 46 47 #ifdef __ASSEMBLY__ 48 49 #define STF_ENTRY_BARRIER_SLOT \ 50 STF_ENTRY_BARRIER_FIXUP_SECTION; \ 51 nop; \ 52 nop; \ 53 nop 54 55 #define STF_EXIT_BARRIER_SLOT \ 56 STF_EXIT_BARRIER_FIXUP_SECTION; \ 57 nop; \ 58 nop; \ 59 nop; \ 60 nop; \ 61 nop; \ 62 nop 63 64 /* 65 * r10 must be free to use, r13 must be paca 66 */ 67 #define INTERRUPT_TO_KERNEL \ 68 STF_ENTRY_BARRIER_SLOT 69 70 /* 71 * Macros for annotating the expected destination of (h)rfid 72 * 73 * The nop instructions allow us to insert one or more instructions to flush the 74 * L1-D cache when returning to userspace or a guest. 75 */ 76 #define RFI_FLUSH_SLOT \ 77 RFI_FLUSH_FIXUP_SECTION; \ 78 nop; \ 79 nop; \ 80 nop 81 82 #define RFI_TO_KERNEL \ 83 rfid 84 85 #define RFI_TO_USER \ 86 STF_EXIT_BARRIER_SLOT; \ 87 RFI_FLUSH_SLOT; \ 88 rfid; \ 89 b rfi_flush_fallback 90 91 #define RFI_TO_USER_OR_KERNEL \ 92 STF_EXIT_BARRIER_SLOT; \ 93 RFI_FLUSH_SLOT; \ 94 rfid; \ 95 b rfi_flush_fallback 96 97 #define RFI_TO_GUEST \ 98 STF_EXIT_BARRIER_SLOT; \ 99 RFI_FLUSH_SLOT; \ 100 rfid; \ 101 b rfi_flush_fallback 102 103 #define HRFI_TO_KERNEL \ 104 hrfid 105 106 #define HRFI_TO_USER \ 107 STF_EXIT_BARRIER_SLOT; \ 108 RFI_FLUSH_SLOT; \ 109 hrfid; \ 110 b hrfi_flush_fallback 111 112 #define HRFI_TO_USER_OR_KERNEL \ 113 STF_EXIT_BARRIER_SLOT; \ 114 RFI_FLUSH_SLOT; \ 115 hrfid; \ 116 b hrfi_flush_fallback 117 118 #define HRFI_TO_GUEST \ 119 STF_EXIT_BARRIER_SLOT; \ 120 RFI_FLUSH_SLOT; \ 121 hrfid; \ 122 b hrfi_flush_fallback 123 124 #define HRFI_TO_UNKNOWN \ 125 STF_EXIT_BARRIER_SLOT; \ 126 RFI_FLUSH_SLOT; \ 127 hrfid; \ 128 b hrfi_flush_fallback 129 130 #endif /* __ASSEMBLY__ */ 131 132 #endif /* _ASM_POWERPC_EXCEPTION_H */ 133