projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| f9ff0f30 SR |
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. | |
| f9ff0f30 SR |
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 | */ | |
| 2c86cd18 | 33 | #include <asm/feature-fixups.h> |
| f9ff0f30 | 34 | |
| 15820091 | 35 | /* PACA save area size in u64 units (exgen, exmc, etc) */ |
| 8568f1e0 | 36 | #if defined(CONFIG_RELOCATABLE) |
| 15820091 | 37 | #define EX_SIZE 10 |
| 8568f1e0 | 38 | #else |
| 15820091 | 39 | #define EX_SIZE 9 |
| 8568f1e0 | 40 | #endif |
| dbeea1d6 | 41 | |
| ba41e1e1 BS |
42 | /* |
| 43 | * maximum recursive depth of MCE exceptions | |
| 44 | */ | |
| 45 | #define MAX_MCE_DEPTH 4 | |
| 46 | ||
| 4508a74a | 47 | #ifdef __ASSEMBLY__ |
| 635942ae | 48 | |
| a048a07d NP |
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 | ||
| aa8a5e00 ME |
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 | |
| 50e51c13 NP |
81 | |
| 82 | #define RFI_TO_KERNEL \ | |
| 83 | rfid | |
| 84 | ||
| 85 | #define RFI_TO_USER \ | |
| a048a07d | 86 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
87 | RFI_FLUSH_SLOT; \ |
| 88 | rfid; \ | |
| 89 | b rfi_flush_fallback | |
| 50e51c13 NP |
90 | |
| 91 | #define RFI_TO_USER_OR_KERNEL \ | |
| a048a07d | 92 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
93 | RFI_FLUSH_SLOT; \ |
| 94 | rfid; \ | |
| 95 | b rfi_flush_fallback | |
| 50e51c13 NP |
96 | |
| 97 | #define RFI_TO_GUEST \ | |
| a048a07d | 98 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
99 | RFI_FLUSH_SLOT; \ |
| 100 | rfid; \ | |
| 101 | b rfi_flush_fallback | |
| 50e51c13 NP |
102 | |
| 103 | #define HRFI_TO_KERNEL \ | |
| 104 | hrfid | |
| 105 | ||
| 106 | #define HRFI_TO_USER \ | |
| a048a07d | 107 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
108 | RFI_FLUSH_SLOT; \ |
| 109 | hrfid; \ | |
| 110 | b hrfi_flush_fallback | |
| 50e51c13 NP |
111 | |
| 112 | #define HRFI_TO_USER_OR_KERNEL \ | |
| a048a07d | 113 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
114 | RFI_FLUSH_SLOT; \ |
| 115 | hrfid; \ | |
| 116 | b hrfi_flush_fallback | |
| 50e51c13 NP |
117 | |
| 118 | #define HRFI_TO_GUEST \ | |
| a048a07d | 119 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
120 | RFI_FLUSH_SLOT; \ |
| 121 | hrfid; \ | |
| 122 | b hrfi_flush_fallback | |
| 50e51c13 NP |
123 | |
| 124 | #define HRFI_TO_UNKNOWN \ | |
| a048a07d | 125 | STF_EXIT_BARRIER_SLOT; \ |
| aa8a5e00 ME |
126 | RFI_FLUSH_SLOT; \ |
| 127 | hrfid; \ | |
| 128 | b hrfi_flush_fallback | |
| 50e51c13 | 129 | |
| 4508a74a | 130 | #endif /* __ASSEMBLY__ */ |
| f9ff0f30 SR |
131 | |
| 132 | #endif /* _ASM_POWERPC_EXCEPTION_H */ |