mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cd849ae9cd
* Fix kexec build failure with CONFIG_THUMB2_KERNEL.
* Avoids deprecated/forbidden sp and pc usage in for ARMv7
onwards, retaining compatibility with older architecture
versions.
* The pc value saved to newregs is now aligned on a predictable
instruction boundary.
(stmia { ... pc } or str pc has implementation-defined results
in most versions of the ARM architecutre, and is prohibited
(unpredictable) in Thumb-2.)
* Switch to named inline asm arguments (else I get readily
confused ...)
The resulting code should be compatible with all architecture
versions >= v3, with or without CONFIG_THUMB2_KERNEL.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Tested-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
#ifndef _ARM_KEXEC_H
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#define _ARM_KEXEC_H
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#ifdef CONFIG_KEXEC
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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#define KEXEC_ARCH KEXEC_ARCH_ARM
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#define KEXEC_ARM_ATAGS_OFFSET 0x1000
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#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
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#ifndef __ASSEMBLY__
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/**
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* crash_setup_regs() - save registers for the panic kernel
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* @newregs: registers are saved here
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* @oldregs: registers to be saved (may be %NULL)
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*
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* Function copies machine registers from @oldregs to @newregs. If @oldregs is
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* %NULL then current registers are stored there.
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*/
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs) {
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memcpy(newregs, oldregs, sizeof(*newregs));
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} else {
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__asm__ __volatile__ (
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"stmia %[regs_base], {r0-r12}\n\t"
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"mov %[_ARM_sp], sp\n\t"
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"str lr, %[_ARM_lr]\n\t"
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"adr %[_ARM_pc], 1f\n\t"
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"mrs %[_ARM_cpsr], cpsr\n\t"
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"1:"
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: [_ARM_pc] "=r" (newregs->ARM_pc),
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[_ARM_cpsr] "=r" (newregs->ARM_cpsr),
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[_ARM_sp] "=r" (newregs->ARM_sp),
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[_ARM_lr] "=o" (newregs->ARM_lr)
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: [regs_base] "r" (&newregs->ARM_r0)
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: "memory"
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);
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}
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}
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_KEXEC */
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#endif /* _ARM_KEXEC_H */
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