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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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957a227d41
Fix the comment for 'struct real_mode_header' to reference the correct assembly file, realmode/rm/header.S. The comment has always incorrectly referenced realmode.S, which doesn't exist, as defining the associated asm blob. Specify the file's path relative to arch/x86 to avoid confusion with boot/header.S. Update the comment for 'struct trampoline_header' to also include the relative path to keep things consistent, and tweak the dual 64/32 reference so that it doesn't appear to be an extension of the relative path, i.e. avoid "realmode/rm/trampoline_32/64.S". Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191126195911.3429-1-sean.j.christopherson@intel.com
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ARCH_X86_REALMODE_H
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#define _ARCH_X86_REALMODE_H
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/*
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* Flag bit definitions for use with the flags field of the trampoline header
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* in the CONFIG_X86_64 variant.
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*/
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#define TH_FLAGS_SME_ACTIVE_BIT 0
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#define TH_FLAGS_SME_ACTIVE BIT(TH_FLAGS_SME_ACTIVE_BIT)
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <asm/io.h>
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/* This must match data at realmode/rm/header.S */
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struct real_mode_header {
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u32 text_start;
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u32 ro_end;
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/* SMP trampoline */
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u32 trampoline_start;
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u32 trampoline_header;
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#ifdef CONFIG_X86_64
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u32 trampoline_pgd;
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#endif
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/* ACPI S3 wakeup */
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#ifdef CONFIG_ACPI_SLEEP
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u32 wakeup_start;
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u32 wakeup_header;
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#endif
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/* APM/BIOS reboot */
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u32 machine_real_restart_asm;
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#ifdef CONFIG_X86_64
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u32 machine_real_restart_seg;
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#endif
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};
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/* This must match data at realmode/rm/trampoline_{32,64}.S */
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struct trampoline_header {
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#ifdef CONFIG_X86_32
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u32 start;
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u16 gdt_pad;
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u16 gdt_limit;
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u32 gdt_base;
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#else
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u64 start;
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u64 efer;
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u32 cr4;
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u32 flags;
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#endif
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};
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extern struct real_mode_header *real_mode_header;
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extern unsigned char real_mode_blob_end[];
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extern unsigned long initial_code;
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extern unsigned long initial_gs;
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extern unsigned long initial_stack;
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extern unsigned char real_mode_blob[];
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extern unsigned char real_mode_relocs[];
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#ifdef CONFIG_X86_32
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extern unsigned char startup_32_smp[];
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extern unsigned char boot_gdt[];
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#else
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extern unsigned char secondary_startup_64[];
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#endif
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static inline size_t real_mode_size_needed(void)
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{
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if (real_mode_header)
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return 0; /* already allocated. */
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return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
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}
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static inline void set_real_mode_mem(phys_addr_t mem)
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{
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real_mode_header = (struct real_mode_header *) __va(mem);
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}
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void reserve_real_mode(void);
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#endif /* __ASSEMBLY__ */
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#endif /* _ARCH_X86_REALMODE_H */
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