2019-05-27 06:55:08 +00:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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2011-09-06 06:59:40 +00:00
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/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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2016-01-27 16:59:36 +00:00
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#include <asm/assembler.h>
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2011-09-06 06:59:40 +00:00
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ARM: 9263/1: use .arch directives instead of assembler command line flags
Similar to commit a6c30873ee4a ("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: https://github.com/llvm/llvm-project/commit/1d51c699b9e2ebc5bcfdbe85c74cc871426333d4
Link: 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>
2022-10-24 19:44:41 +00:00
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.arch armv7-a
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2013-04-16 14:11:19 +00:00
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diag_reg_offset:
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.word g_diag_reg - .
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.macro set_diag_reg
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adr r0, diag_reg_offset
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ldr r1, [r0]
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add r1, r1, r0 @ r1 = physical &g_diag_reg
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ldr r0, [r1]
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mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
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.endm
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2011-09-06 06:59:40 +00:00
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ENTRY(v7_secondary_startup)
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2016-01-27 16:59:36 +00:00
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ARM_BE8(setend be) @ go BE8 if entered LE
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2021-05-26 00:14:16 +00:00
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mrc p15, 0, r0, c0, c0, 0
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lsl r0, r0, #16
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lsr r0, r0, #20
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/* 0xc07 is cortex A7's ID */
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mov r1, #0xc00
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orr r1, #0x7
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cmp r0, r1
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beq secondary_startup
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2013-04-16 14:11:19 +00:00
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set_diag_reg
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2011-09-06 06:59:40 +00:00
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b secondary_startup
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ENDPROC(v7_secondary_startup)
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