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| author | Andy Lutomirski <luto@kernel.org> | 2017-02-20 08:56:09 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-02-21 11:48:35 +0100 |
| commit | 4f53ab14285802b298261f8b52af322039d1dfd0 (patch) | |
| tree | 885e931017318cebebb6306610bff889bf5fe96b /arch/x86 | |
| parent | 06ce521af9558814b8606c0476c54497cf83a653 (diff) | |
| download | linux-4f53ab14285802b298261f8b52af322039d1dfd0.tar.gz linux-4f53ab14285802b298261f8b52af322039d1dfd0.tar.xz | |
x86/asm: Define the kernel TSS limit in a macro
Rather than open-coding the kernel TSS limit in set_tss_desc(), make
it a real macro near the TSS layout definition.
This is purely a cleanup.
Cc: Thomas Garnier <thgarnie@google.com>
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/desc.h | 10 | ||||
| -rw-r--r-- | arch/x86/include/asm/processor.h | 10 |
2 files changed, 11 insertions, 9 deletions
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index 12080d87da3b..2e781bcc5e12 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -177,16 +177,8 @@ static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr) struct desc_struct *d = get_cpu_gdt_table(cpu); tss_desc tss; - /* - * sizeof(unsigned long) coming from an extra "long" at the end - * of the iobitmap. See tss_struct definition in processor.h - * - * -1? seg base+limit should be pointing to the address of the - * last valid byte - */ set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + - sizeof(unsigned long) - 1); + __KERNEL_TSS_LIMIT); write_gdt_entry(d, entry, &tss, DESC_TSS); } diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 1be64da0384e..f8f1b7537abe 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -341,6 +341,16 @@ struct tss_struct { DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss); +/* + * sizeof(unsigned long) coming from an extra "long" at the end + * of the iobitmap. + * + * -1? seg base+limit should be pointing to the address of the + * last valid byte + */ +#define __KERNEL_TSS_LIMIT \ + (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1) + #ifdef CONFIG_X86_32 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack); #endif |