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kernel: align gdt and idt base addresses

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patch my fdmanana:
As recommended by the Intel 64 and IA-32 Architectures Developer's
Manual Volume 3A, the GDT and IDT base addresses should be aligned on an
8 byte boundary to yield better processor performance.
This commit is contained in:
Ben Gras 2012-04-15 20:39:36 +02:00
parent 7daa6a6054
commit 927b9ef243
1 changed files with 6 additions and 2 deletions
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8
kernel/arch/i386/protect.c
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@ -25,7 +25,9 @@ struct gatedesc_s {
u16_t offset_high; u16_t offset_high;
}; };
struct segdesc_s gdt[GDT_SIZE]= /* used in klib.s and mpx.s */
/* used in klib.s and mpx.s */
struct segdesc_s gdt[GDT_SIZE] __aligned(DESC_SIZE) =
{ {0}, { {0},
{0,0,0,0}, /* GDT descriptor */ {0,0,0,0}, /* GDT descriptor */
{0,0,0,0}, /* IDT descriptor */ {0,0,0,0}, /* IDT descriptor */
@ -35,7 +37,9 @@ struct segdesc_s gdt[GDT_SIZE]= /* used in klib.s and mpx.s */
{0xffff,0,0,0x9b,0xcf,0}, /* kernel CS */ {0xffff,0,0,0x9b,0xcf,0}, /* kernel CS */
{0xffff,0,0,0x9b,0xcf,0}, /* temp for BIOS (386: monitor CS at startup) */ {0xffff,0,0,0x9b,0xcf,0}, /* temp for BIOS (386: monitor CS at startup) */
}; };
static struct gatedesc_s idt[IDT_SIZE]; /* zero-init so none present */
/* zero-init so none present */
static struct gatedesc_s idt[IDT_SIZE] __aligned(DESC_SIZE);
struct tss_s tss[CONFIG_MAX_CPUS]; /* zero init */ struct tss_s tss[CONFIG_MAX_CPUS]; /* zero init */
static void sdesc(struct segdesc_s *segdp, phys_bytes base, vir_bytes static void sdesc(struct segdesc_s *segdp, phys_bytes base, vir_bytes