mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 04:54:41 +08:00
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>
300 lines
8.1 KiB
ArmAsm
300 lines
8.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/mm/proc-v6.S
|
|
*
|
|
* Copyright (C) 2001 Deep Blue Solutions Ltd.
|
|
* Modified by Catalin Marinas for noMMU support
|
|
*
|
|
* This is the "shell" of the ARMv6 processor support.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/pgtable.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/hwcap.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
|
|
#include "proc-macros.S"
|
|
|
|
#define D_CACHE_LINE_SIZE 32
|
|
|
|
#define TTB_C (1 << 0)
|
|
#define TTB_S (1 << 1)
|
|
#define TTB_IMP (1 << 2)
|
|
#define TTB_RGN_NC (0 << 3)
|
|
#define TTB_RGN_WBWA (1 << 3)
|
|
#define TTB_RGN_WT (2 << 3)
|
|
#define TTB_RGN_WB (3 << 3)
|
|
|
|
#define TTB_FLAGS_UP TTB_RGN_WBWA
|
|
#define PMD_FLAGS_UP PMD_SECT_WB
|
|
#define TTB_FLAGS_SMP TTB_RGN_WBWA|TTB_S
|
|
#define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
|
|
|
|
.arch armv6
|
|
|
|
ENTRY(cpu_v6_proc_init)
|
|
ret lr
|
|
|
|
ENTRY(cpu_v6_proc_fin)
|
|
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
|
|
bic r0, r0, #0x1000 @ ...i............
|
|
bic r0, r0, #0x0006 @ .............ca.
|
|
mcr p15, 0, r0, c1, c0, 0 @ disable caches
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_v6_reset(loc)
|
|
*
|
|
* Perform a soft reset of the system. Put the CPU into the
|
|
* same state as it would be if it had been reset, and branch
|
|
* to what would be the reset vector.
|
|
*
|
|
* - loc - location to jump to for soft reset
|
|
*/
|
|
.align 5
|
|
.pushsection .idmap.text, "ax"
|
|
ENTRY(cpu_v6_reset)
|
|
mrc p15, 0, r1, c1, c0, 0 @ ctrl register
|
|
bic r1, r1, #0x1 @ ...............m
|
|
mcr p15, 0, r1, c1, c0, 0 @ disable MMU
|
|
mov r1, #0
|
|
mcr p15, 0, r1, c7, c5, 4 @ ISB
|
|
ret r0
|
|
ENDPROC(cpu_v6_reset)
|
|
.popsection
|
|
|
|
/*
|
|
* cpu_v6_do_idle()
|
|
*
|
|
* Idle the processor (eg, wait for interrupt).
|
|
*
|
|
* IRQs are already disabled.
|
|
*/
|
|
ENTRY(cpu_v6_do_idle)
|
|
mov r1, #0
|
|
mcr p15, 0, r1, c7, c10, 4 @ DWB - WFI may enter a low-power mode
|
|
mcr p15, 0, r1, c7, c0, 4 @ wait for interrupt
|
|
ret lr
|
|
|
|
ENTRY(cpu_v6_dcache_clean_area)
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #D_CACHE_LINE_SIZE
|
|
subs r1, r1, #D_CACHE_LINE_SIZE
|
|
bhi 1b
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_v6_switch_mm(pgd_phys, tsk)
|
|
*
|
|
* Set the translation table base pointer to be pgd_phys
|
|
*
|
|
* - pgd_phys - physical address of new TTB
|
|
*
|
|
* It is assumed that:
|
|
* - we are not using split page tables
|
|
*/
|
|
ENTRY(cpu_v6_switch_mm)
|
|
#ifdef CONFIG_MMU
|
|
mov r2, #0
|
|
mmid r1, r1 @ get mm->context.id
|
|
ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
|
|
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
|
|
mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
|
|
mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
|
|
#ifdef CONFIG_PID_IN_CONTEXTIDR
|
|
mrc p15, 0, r2, c13, c0, 1 @ read current context ID
|
|
bic r2, r2, #0xff @ extract the PID
|
|
and r1, r1, #0xff
|
|
orr r1, r1, r2 @ insert into new context ID
|
|
#endif
|
|
mcr p15, 0, r1, c13, c0, 1 @ set context ID
|
|
#endif
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_v6_set_pte_ext(ptep, pte, ext)
|
|
*
|
|
* Set a level 2 translation table entry.
|
|
*
|
|
* - ptep - pointer to level 2 translation table entry
|
|
* (hardware version is stored at -1024 bytes)
|
|
* - pte - PTE value to store
|
|
* - ext - value for extended PTE bits
|
|
*/
|
|
armv6_mt_table cpu_v6
|
|
|
|
ENTRY(cpu_v6_set_pte_ext)
|
|
#ifdef CONFIG_MMU
|
|
armv6_set_pte_ext cpu_v6
|
|
#endif
|
|
ret lr
|
|
|
|
/* Suspend/resume support: taken from arch/arm/mach-s3c64xx/sleep.S */
|
|
.globl cpu_v6_suspend_size
|
|
.equ cpu_v6_suspend_size, 4 * 6
|
|
#ifdef CONFIG_ARM_CPU_SUSPEND
|
|
ENTRY(cpu_v6_do_suspend)
|
|
stmfd sp!, {r4 - r9, lr}
|
|
mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
|
|
#ifdef CONFIG_MMU
|
|
mrc p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
mrc p15, 0, r6, c2, c0, 1 @ Translation table base 1
|
|
#endif
|
|
mrc p15, 0, r7, c1, c0, 1 @ auxiliary control register
|
|
mrc p15, 0, r8, c1, c0, 2 @ co-processor access control
|
|
mrc p15, 0, r9, c1, c0, 0 @ control register
|
|
stmia r0, {r4 - r9}
|
|
ldmfd sp!, {r4- r9, pc}
|
|
ENDPROC(cpu_v6_do_suspend)
|
|
|
|
ENTRY(cpu_v6_do_resume)
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c14, 0 @ clean+invalidate D cache
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, ip, c7, c15, 0 @ clean+invalidate cache
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain write buffer
|
|
mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID
|
|
ldmia r0, {r4 - r9}
|
|
mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r1, r1, #TTB_FLAGS_UP)
|
|
mcr p15, 0, r1, c2, c0, 0 @ Translation table base 0
|
|
mcr p15, 0, r6, c2, c0, 1 @ Translation table base 1
|
|
mcr p15, 0, ip, c2, c0, 2 @ TTB control register
|
|
#endif
|
|
mcr p15, 0, r7, c1, c0, 1 @ auxiliary control register
|
|
mcr p15, 0, r8, c1, c0, 2 @ co-processor access control
|
|
mcr p15, 0, ip, c7, c5, 4 @ ISB
|
|
mov r0, r9 @ control register
|
|
b cpu_resume_mmu
|
|
ENDPROC(cpu_v6_do_resume)
|
|
#endif
|
|
|
|
string cpu_v6_name, "ARMv6-compatible processor"
|
|
|
|
.align
|
|
|
|
/*
|
|
* __v6_setup
|
|
*
|
|
* Initialise TLB, Caches, and MMU state ready to switch the MMU
|
|
* on. Return in r0 the new CP15 C1 control register setting.
|
|
*
|
|
* We automatically detect if we have a Harvard cache, and use the
|
|
* Harvard cache control instructions insead of the unified cache
|
|
* control instructions.
|
|
*
|
|
* This should be able to cover all ARMv6 cores.
|
|
*
|
|
* It is assumed that:
|
|
* - cache type register is implemented
|
|
*/
|
|
__v6_setup:
|
|
#ifdef CONFIG_SMP
|
|
ALT_SMP(mrc p15, 0, r0, c1, c0, 1) @ Enable SMP/nAMP mode
|
|
ALT_UP(nop)
|
|
orr r0, r0, #0x20
|
|
ALT_SMP(mcr p15, 0, r0, c1, c0, 1)
|
|
ALT_UP(nop)
|
|
#endif
|
|
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
|
|
mcr p15, 0, r0, c2, c0, 2 @ TTB control register
|
|
ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
|
|
ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r8, r8, #TTB_FLAGS_UP)
|
|
mcr p15, 0, r8, c2, c0, 1 @ load TTB1
|
|
#endif /* CONFIG_MMU */
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer and
|
|
@ complete invalidations
|
|
adr r5, v6_crval
|
|
ldmia r5, {r5, r6}
|
|
ARM_BE8(orr r6, r6, #1 << 25) @ big-endian page tables
|
|
mrc p15, 0, r0, c1, c0, 0 @ read control register
|
|
bic r0, r0, r5 @ clear bits them
|
|
orr r0, r0, r6 @ set them
|
|
#ifdef CONFIG_ARM_ERRATA_364296
|
|
/*
|
|
* Workaround for the 364296 ARM1136 r0p2 erratum (possible cache data
|
|
* corruption with hit-under-miss enabled). The conditional code below
|
|
* (setting the undocumented bit 31 in the auxiliary control register
|
|
* and the FI bit in the control register) disables hit-under-miss
|
|
* without putting the processor into full low interrupt latency mode.
|
|
*/
|
|
ldr r6, =0x4107b362 @ id for ARM1136 r0p2
|
|
mrc p15, 0, r5, c0, c0, 0 @ get processor id
|
|
teq r5, r6 @ check for the faulty core
|
|
mrceq p15, 0, r5, c1, c0, 1 @ load aux control reg
|
|
orreq r5, r5, #(1 << 31) @ set the undocumented bit 31
|
|
mcreq p15, 0, r5, c1, c0, 1 @ write aux control reg
|
|
orreq r0, r0, #(1 << 21) @ low interrupt latency configuration
|
|
#endif
|
|
ret lr @ return to head.S:__ret
|
|
|
|
/*
|
|
* V X F I D LR
|
|
* .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM
|
|
* rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
|
|
* 0 110 0011 1.00 .111 1101 < we want
|
|
*/
|
|
.type v6_crval, #object
|
|
v6_crval:
|
|
crval clear=0x01e0fb7f, mmuset=0x00c0387d, ucset=0x00c0187c
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions v6, dabort=v6_early_abort, pabort=v6_pabort, suspend=1
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv6"
|
|
string cpu_elf_name, "v6"
|
|
.align
|
|
|
|
.section ".proc.info.init", "a"
|
|
|
|
/*
|
|
* Match any ARMv6 processor core.
|
|
*/
|
|
.type __v6_proc_info, #object
|
|
__v6_proc_info:
|
|
.long 0x0007b000
|
|
.long 0x0007f000
|
|
ALT_SMP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_SMP)
|
|
ALT_UP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_UP)
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_XN | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
initfn __v6_setup, __v6_proc_info
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
/* See also feat_v6_fixup() for HWCAP_TLS */
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA|HWCAP_TLS
|
|
.long cpu_v6_name
|
|
.long v6_processor_functions
|
|
.long v6wbi_tlb_fns
|
|
.long v6_user_fns
|
|
.long v6_cache_fns
|
|
.size __v6_proc_info, . - __v6_proc_info
|