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x86: Tidy up the GDT size in start/16.S

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Use a symbol to select the size of the GDT, rather than hard-coding a
value. This matches how it is done in start64

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-03-15 14:25:36 +00:00
committed by Tom Rini
parent aae07e3df8
commit 3c7ab12249
2 changed files with 5 additions and 2 deletions
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4
arch/x86/cpu/start.S
View File

@@ -254,7 +254,7 @@ multiboot_header:
* GDT is setup in a safe location in RAM
*/
gdt_ptr2:
.word 0x1f /* limit (31 bytes = 4 GDT entries - 1) */
.word gdt2_end - gdt_ptr2 - 1
.long gdt_rom2 /* base */
/* Some CPUs are picky about GDT alignment... */
@@ -313,4 +313,6 @@ gdt_rom2:
.byte 0x93 /* access */
.byte 0xcf /* flags + limit_high */
.byte 0x00 /* base_high */
gdt2_end:
#endif

3
arch/x86/cpu/start16.S
View File

@@ -61,7 +61,7 @@ idt_ptr:
* GDT is setup in a safe location in RAM
*/
gdt_ptr:
.word 0x1f /* limit (31 bytes = 4 GDT entries - 1) */
.word gdt_end - gdt_rom - 1
.long BOOT_SEG + gdt_rom /* base */
/* Some CPUs are picky about GDT alignment... */
@@ -120,3 +120,4 @@ gdt_rom:
.byte 0x93 /* access */
.byte 0xcf /* flags + limit_high */
.byte 0x00 /* base_high */
gdt_end: