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 #define EX_SIZE 10 37 38 /* 39 * maximum recursive depth of MCE exceptions 40 */ 41 #define MAX_MCE_DEPTH 4 42 43 #ifdef __ASSEMBLY__ 44 45 #define STF_ENTRY_BARRIER_SLOT \ 46 STF_ENTRY_BARRIER_FIXUP_SECTION; \ 47 nop; \ 48 nop; \ 49 nop 50 51 #define STF_EXIT_BARRIER_SLOT \ 52 STF_EXIT_BARRIER_FIXUP_SECTION; \ 53 nop; \ 54 nop; \ 55 nop; \ 56 nop; \ 57 nop; \ 58 nop 59 60 /* 61 * r10 must be free to use, r13 must be paca 62 */ 63 #define INTERRUPT_TO_KERNEL \ 64 STF_ENTRY_BARRIER_SLOT 65 66 /* 67 * Macros for annotating the expected destination of (h)rfid 68 * 69 * The nop instructions allow us to insert one or more instructions to flush the 70 * L1-D cache when returning to userspace or a guest. 71 */ 72 #define RFI_FLUSH_SLOT \ 73 RFI_FLUSH_FIXUP_SECTION; \ 74 nop; \ 75 nop; \ 76 nop 77 78 #define RFI_TO_KERNEL \ 79 rfid 80 81 #define RFI_TO_USER \ 82 STF_EXIT_BARRIER_SLOT; \ 83 RFI_FLUSH_SLOT; \ 84 rfid; \ 85 b rfi_flush_fallback 86 87 #define RFI_TO_USER_OR_KERNEL \ 88 STF_EXIT_BARRIER_SLOT; \ 89 RFI_FLUSH_SLOT; \ 90 rfid; \ 91 b rfi_flush_fallback 92 93 #define RFI_TO_GUEST \ 94 STF_EXIT_BARRIER_SLOT; \ 95 RFI_FLUSH_SLOT; \ 96 rfid; \ 97 b rfi_flush_fallback 98 99 #define HRFI_TO_KERNEL \ 100 hrfid 101 102 #define HRFI_TO_USER \ 103 STF_EXIT_BARRIER_SLOT; \ 104 RFI_FLUSH_SLOT; \ 105 hrfid; \ 106 b hrfi_flush_fallback 107 108 #define HRFI_TO_USER_OR_KERNEL \ 109 STF_EXIT_BARRIER_SLOT; \ 110 RFI_FLUSH_SLOT; \ 111 hrfid; \ 112 b hrfi_flush_fallback 113 114 #define HRFI_TO_GUEST \ 115 STF_EXIT_BARRIER_SLOT; \ 116 RFI_FLUSH_SLOT; \ 117 hrfid; \ 118 b hrfi_flush_fallback 119 120 #define HRFI_TO_UNKNOWN \ 121 STF_EXIT_BARRIER_SLOT; \ 122 RFI_FLUSH_SLOT; \ 123 hrfid; \ 124 b hrfi_flush_fallback 125 126 #endif /* __ASSEMBLY__ */ 127 128 #endif /* _ASM_POWERPC_EXCEPTION_H */ 129