1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_EXCEPTION_H
3 #define _ASM_POWERPC_EXCEPTION_H
5 * Extracted from head_64.S
8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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.
17 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
18 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
20 * This file contains the low-level support and setup for the
21 * PowerPC-64 platform, including trap and interrupt dispatch.
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.
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.
33 #include <asm/feature-fixups.h>
35 /* PACA save area size in u64 units (exgen, exmc, etc) */
36 #if defined(CONFIG_RELOCATABLE)
43 * maximum recursive depth of MCE exceptions
45 #define MAX_MCE_DEPTH 4
49 #define STF_ENTRY_BARRIER_SLOT \
50 STF_ENTRY_BARRIER_FIXUP_SECTION; \
55 #define STF_EXIT_BARRIER_SLOT \
56 STF_EXIT_BARRIER_FIXUP_SECTION; \
64 #define ENTRY_FLUSH_SLOT \
65 ENTRY_FLUSH_FIXUP_SECTION; \
71 * r10 must be free to use, r13 must be paca
73 #define INTERRUPT_TO_KERNEL \
74 STF_ENTRY_BARRIER_SLOT; \
78 * Macros for annotating the expected destination of (h)rfid
80 * The nop instructions allow us to insert one or more instructions to flush the
81 * L1-D cache when returning to userspace or a guest.
83 #define RFI_FLUSH_SLOT \
84 RFI_FLUSH_FIXUP_SECTION; \
89 #define RFI_TO_KERNEL \
93 STF_EXIT_BARRIER_SLOT; \
98 #define RFI_TO_USER_OR_KERNEL \
99 STF_EXIT_BARRIER_SLOT; \
104 #define RFI_TO_GUEST \
105 STF_EXIT_BARRIER_SLOT; \
110 #define HRFI_TO_KERNEL \
113 #define HRFI_TO_USER \
114 STF_EXIT_BARRIER_SLOT; \
117 b hrfi_flush_fallback
119 #define HRFI_TO_USER_OR_KERNEL \
120 STF_EXIT_BARRIER_SLOT; \
123 b hrfi_flush_fallback
125 #define HRFI_TO_GUEST \
126 STF_EXIT_BARRIER_SLOT; \
129 b hrfi_flush_fallback
131 #define HRFI_TO_UNKNOWN \
132 STF_EXIT_BARRIER_SLOT; \
135 b hrfi_flush_fallback
137 #else /* __ASSEMBLY__ */
138 /* Prototype for function defined in exceptions-64s.S */
139 void do_uaccess_flush(void);
140 #endif /* __ASSEMBLY__ */
142 #endif /* _ASM_POWERPC_EXCEPTION_H */