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x86/boot/efi: Cleanup initialization of GDT entries 

This is preparation for following patches without changing semantics of the
code.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170606113133.22974-4-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2017-06-06 14:31:22 +03:00 committed by Ingo Molnar
parent cbe0317bf1
commit f8fceacbd1
1 changed files with 21 additions and 18 deletions
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39
arch/x86/boot/compressed/eboot.c
View File

@ -1049,6 +1049,7 @@ struct boot_params *efi_main(struct efi_config *c,
/* The first GDT is a dummy and the second is unused. */
desc += 2;
/* __KERNEL_CS */
desc->limit0 = 0xffff;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
@ -1062,8 +1063,9 @@ struct boot_params *efi_main(struct efi_config *c,
desc->d = SEG_OP_SIZE_32BIT;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
desc++;
/* __KERNEL_DS */
desc->limit0 = 0xffff;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
@ -1077,24 +1079,25 @@ struct boot_params *efi_main(struct efi_config *c,
desc->d = SEG_OP_SIZE_32BIT;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
#ifdef CONFIG_X86_64
/* Task segment value */
desc++;
desc->limit0 = 0x0000;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
desc->type = SEG_TYPE_TSS;
desc->s = 0;
desc->dpl = 0;
desc->p = 1;
desc->limit = 0x0;
desc->avl = 0;
desc->l = 0;
desc->d = 0;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
#endif /* CONFIG_X86_64 */
if (IS_ENABLED(CONFIG_X86_64)) {
/* Task segment value */
desc->limit0 = 0x0000;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
desc->type = SEG_TYPE_TSS;
desc->s = 0;
desc->dpl = 0;
desc->p = 1;
desc->limit = 0x0;
desc->avl = 0;
desc->l = 0;
desc->d = 0;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
desc++;
}
asm volatile("cli");
asm volatile ("lgdt %0" : : "m" (*gdt));