/* 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 /* PACA save area offsets */ #define EX_R9 0 #define EX_R10 8 #define EX_R11 16 #define EX_R12 24 #define EX_R13 32 #define EX_DAR 40 #define EX_DSISR 48 #define EX_CCR 52 #define EX_CFAR 56 #define EX_PPR 64 #define EX_CTR 72 /* * maximum recursive depth of MCE exceptions */ #define MAX_MCE_DEPTH 4 #ifdef __ASSEMBLER__ #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 #define ENTRY_FLUSH_SLOT \ ENTRY_FLUSH_FIXUP_SECTION; \ nop; \ nop; \ nop; #define SCV_ENTRY_FLUSH_SLOT \ SCV_ENTRY_FLUSH_FIXUP_SECTION; \ nop; \ nop; \ nop; /* * r10 must be free to use, r13 must be paca */ #define INTERRUPT_TO_KERNEL \ STF_ENTRY_BARRIER_SLOT; \ ENTRY_FLUSH_SLOT /* * r10, ctr must be free to use, r13 must be paca */ #define SCV_INTERRUPT_TO_KERNEL \ STF_ENTRY_BARRIER_SLOT; \ SCV_ENTRY_FLUSH_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. * * powerpc relies on return from interrupt/syscall being context synchronising * (which hrfid, rfid, and rfscv are) to support ARCH_HAS_MEMBARRIER_SYNC_CORE * without additional synchronisation instructions. * * soft-masked interrupt replay does not include a context-synchronising rfid, * but those always return to kernel, the sync is only required when returning * to user. */ #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 #define RFSCV_TO_USER \ STF_EXIT_BARRIER_SLOT; \ RFI_FLUSH_SLOT; \ RFSCV; \ b rfscv_flush_fallback #else /* __ASSEMBLER__ */ /* Prototype for function defined in exceptions-64s.S */ void do_uaccess_flush(void); #endif /* __ASSEMBLER__ */ #endif /* _ASM_POWERPC_EXCEPTION_H */
