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a2faac3986
Similar to commita6c30873ee("ARM: 8989/1: use .fpu assembler directives instead of assembler arguments"). GCC and GNU binutils support setting the "sub arch" via -march=, -Wa,-march, target function attribute, and .arch assembler directive. Clang was missing support for -Wa,-march=, but this was implemented in clang-13. The behavior of both GCC and Clang is to prefer -Wa,-march= over -march= for assembler and assembler-with-cpp sources, but Clang will warn about the -march= being unused. clang: warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] Since most assembler is non-conditionally assembled with one sub arch (modulo arch/arm/delay-loop.S which conditionally is assembled as armv4 based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the .arch assembler directive. Add a few more instances found in compile testing as found by Arnd and Nathan. Link:1d51c699b9Link: https://bugs.llvm.org/show_bug.cgi?id=48894 Link: https://github.com/ClangBuiltLinux/linux/issues/1195 Link: https://github.com/ClangBuiltLinux/linux/issues/1315 Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
334 lines
7.7 KiB
ArmAsm
334 lines
7.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/cache-v6.S
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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*
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* This is the "shell" of the ARMv6 processor support.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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#include <asm/unwind.h>
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#include "proc-macros.S"
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#define HARVARD_CACHE
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#define CACHE_LINE_SIZE 32
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#define D_CACHE_LINE_SIZE 32
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#define BTB_FLUSH_SIZE 8
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.arch armv6
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/*
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* v6_flush_icache_all()
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*
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* Flush the whole I-cache.
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*
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* ARM1136 erratum 411920 - Invalidate Instruction Cache operation can fail.
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* This erratum is present in 1136, 1156 and 1176. It does not affect the
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* MPCore.
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*
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* Registers:
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* r0 - set to 0
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* r1 - corrupted
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*/
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ENTRY(v6_flush_icache_all)
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mov r0, #0
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#ifdef CONFIG_ARM_ERRATA_411920
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mrs r1, cpsr
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cpsid ifa @ disable interrupts
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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msr cpsr_cx, r1 @ restore interrupts
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.rept 11 @ ARM Ltd recommends at least
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nop @ 11 NOPs
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.endr
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#else
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I-cache
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#endif
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ret lr
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ENDPROC(v6_flush_icache_all)
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/*
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* v6_flush_cache_all()
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*
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* Flush the entire cache.
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*
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* It is assumed that:
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*/
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ENTRY(v6_flush_kern_cache_all)
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
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#endif
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ret lr
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/*
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* v6_flush_cache_all()
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*
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* Flush all TLB entries in a particular address space
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*
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* - mm - mm_struct describing address space
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*/
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ENTRY(v6_flush_user_cache_all)
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/*FALLTHROUGH*/
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/*
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* v6_flush_cache_range(start, end, flags)
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*
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* Flush a range of TLB entries in the specified address space.
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*
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* - start - start address (may not be aligned)
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* - end - end address (exclusive, may not be aligned)
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* - flags - vm_area_struct flags describing address space
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*
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* It is assumed that:
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* - we have a VIPT cache.
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*/
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ENTRY(v6_flush_user_cache_range)
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ret lr
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/*
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* v6_coherent_kern_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* v6_coherent_user_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_user_range)
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UNWIND(.fnstart )
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#ifdef HARVARD_CACHE
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bic r0, r0, #CACHE_LINE_SIZE - 1
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1:
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USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
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add r0, r0, #CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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#endif
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
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#endif
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ret lr
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/*
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* Fault handling for the cache operation above. If the virtual address in r0
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* isn't mapped, fail with -EFAULT.
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*/
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9001:
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mov r0, #-EFAULT
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ret lr
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UNWIND(.fnend )
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ENDPROC(v6_coherent_user_range)
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ENDPROC(v6_coherent_kern_range)
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/*
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* v6_flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure that the data held in the page kaddr is written back
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* to the page in question.
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*
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* - addr - kernel address
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* - size - region size
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*/
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ENTRY(v6_flush_kern_dcache_area)
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add r1, r0, r1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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#ifdef HARVARD_CACHE
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4
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#endif
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ret lr
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/*
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* v6_dma_inv_range(start,end)
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*
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* Invalidate the data cache within the specified region; we will
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* be performing a DMA operation in this region and we want to
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* purge old data in the cache.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_inv_range:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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tst r0, #D_CACHE_LINE_SIZE - 1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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tst r1, #D_CACHE_LINE_SIZE - 1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrbne r2, [r1, #-1] @ read for ownership
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strbne r2, [r1, #-1] @ write for ownership
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#endif
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bic r1, r1, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
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#else
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mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
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#endif
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
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#else
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mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrlo r2, [r0] @ read for ownership
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strlo r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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ret lr
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/*
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* v6_dma_clean_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_clean_range:
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldr r2, [r0] @ read for ownership
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#endif
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcr p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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ret lr
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/*
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* v6_dma_flush_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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ENTRY(v6_dma_flush_range)
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrblo r2, [r0] @ read for ownership
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strblo r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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ret lr
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(v6_dma_map_area)
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add r1, r1, r0
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teq r2, #DMA_FROM_DEVICE
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beq v6_dma_inv_range
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#ifndef CONFIG_DMA_CACHE_RWFO
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b v6_dma_clean_range
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#else
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teq r2, #DMA_TO_DEVICE
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beq v6_dma_clean_range
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b v6_dma_flush_range
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#endif
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ENDPROC(v6_dma_map_area)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(v6_dma_unmap_area)
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#ifndef CONFIG_DMA_CACHE_RWFO
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add r1, r1, r0
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teq r2, #DMA_TO_DEVICE
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bne v6_dma_inv_range
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#endif
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ret lr
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ENDPROC(v6_dma_unmap_area)
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.globl v6_flush_kern_cache_louis
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.equ v6_flush_kern_cache_louis, v6_flush_kern_cache_all
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__INITDATA
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions v6
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