Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [PATCH v2 RESEND 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage | Date | Thu, 7 Sep 2017 15:42:29 +0800 |
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The BIOS on SGI UV system will report a UV system table which describes specific firmware capabilities available to the Linux kernel at runtime. This UV system table only exists on SGI UV system. And it's detected in efi_init() which is at very early stage.
So introduce a new helper function is_early_uv_system() to identify if a system is UV system. Later we will use it to check if the running system is UV system in mm KASLR code.
Signed-off-by: Baoquan He <bhe@redhat.com> Acked-by: Mike Travis <travis@sgi.com> --- arch/x86/include/asm/uv/uv.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h index b5a32231abd8..93d7ad8763ba 100644 --- a/arch/x86/include/asm/uv/uv.h +++ b/arch/x86/include/asm/uv/uv.h @@ -18,6 +18,11 @@ extern void uv_nmi_init(void); extern void uv_system_init(void); extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, const struct flush_tlb_info *info); +#include <linux/efi.h> +static inline int is_early_uv_system(void) +{ + return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab); +} #else /* X86_UV */ @@ -30,6 +35,7 @@ static inline const struct cpumask * uv_flush_tlb_others(const struct cpumask *cpumask, const struct flush_tlb_info *info) { return cpumask; } +static inline int is_early_uv_system(void) { return 0; } #endif /* X86_UV */ -- 2.5.5
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