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x86/asm: Define the kernel TSS limit in a macro

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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>
This commit is contained in:
Andy Lutomirski 2017-02-20 08:56:09 -08:00 committed by Paolo Bonzini
parent 06ce521af9
commit 4f53ab1428
2 changed files with 11 additions and 9 deletions
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10
arch/x86/include/asm/desc.h
View file

@ -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);
}

10
arch/x86/include/asm/processor.h
View file

@ -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