/arch/powerpc/include/asm/exception-64s.h
http://github.com/mirrors/linux · C Header · 128 lines · 67 code · 18 blank · 43 comment · 0 complexity · b092269c53440c59eed9054db6d5ade1 MD5 · raw file
- /* SPDX-License-Identifier: GPL-2.0-or-later */
- #ifndef _ASM_POWERPC_EXCEPTION_H
- #define _ASM_POWERPC_EXCEPTION_H
- /*
- * Extracted from head_64.S
- *
- * PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
- * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
- * Adapted for Power Macintosh by Paul Mackerras.
- * Low-level exception handlers and MMU support
- * rewritten by Paul Mackerras.
- * Copyright (C) 1996 Paul Mackerras.
- *
- * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
- * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
- *
- * This file contains the low-level support and setup for the
- * PowerPC-64 platform, including trap and interrupt dispatch.
- */
- /*
- * The following macros define the code that appears as
- * the prologue to each of the exception handlers. They
- * are split into two parts to allow a single kernel binary
- * to be used for pSeries and iSeries.
- *
- * We make as much of the exception code common between native
- * exception handlers (including pSeries LPAR) and iSeries LPAR
- * implementations as possible.
- */
- #include <asm/feature-fixups.h>
- /* PACA save area size in u64 units (exgen, exmc, etc) */
- #define EX_SIZE 10
- /*
- * maximum recursive depth of MCE exceptions
- */
- #define MAX_MCE_DEPTH 4
- #ifdef __ASSEMBLY__
- #define STF_ENTRY_BARRIER_SLOT \
- STF_ENTRY_BARRIER_FIXUP_SECTION; \
- nop; \
- nop; \
- nop
- #define STF_EXIT_BARRIER_SLOT \
- STF_EXIT_BARRIER_FIXUP_SECTION; \
- nop; \
- nop; \
- nop; \
- nop; \
- nop; \
- nop
- /*
- * r10 must be free to use, r13 must be paca
- */
- #define INTERRUPT_TO_KERNEL \
- STF_ENTRY_BARRIER_SLOT
- /*
- * Macros for annotating the expected destination of (h)rfid
- *
- * The nop instructions allow us to insert one or more instructions to flush the
- * L1-D cache when returning to userspace or a guest.
- */
- #define RFI_FLUSH_SLOT \
- RFI_FLUSH_FIXUP_SECTION; \
- nop; \
- nop; \
- nop
- #define RFI_TO_KERNEL \
- rfid
- #define RFI_TO_USER \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- rfid; \
- b rfi_flush_fallback
- #define RFI_TO_USER_OR_KERNEL \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- rfid; \
- b rfi_flush_fallback
- #define RFI_TO_GUEST \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- rfid; \
- b rfi_flush_fallback
- #define HRFI_TO_KERNEL \
- hrfid
- #define HRFI_TO_USER \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- hrfid; \
- b hrfi_flush_fallback
- #define HRFI_TO_USER_OR_KERNEL \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- hrfid; \
- b hrfi_flush_fallback
- #define HRFI_TO_GUEST \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- hrfid; \
- b hrfi_flush_fallback
- #define HRFI_TO_UNKNOWN \
- STF_EXIT_BARRIER_SLOT; \
- RFI_FLUSH_SLOT; \
- hrfid; \
- b hrfi_flush_fallback
- #endif /* __ASSEMBLY__ */
- #endif /* _ASM_POWERPC_EXCEPTION_H */