diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2020-11-21 17:59:41 +0200 |
|---|---|---|
| committer | Hung-Te Lin <hungte@chromium.org> | 2020-12-16 06:31:03 +0000 |
| commit | dc873cc0c6402f289f34090f0fdb34588a04a9c0 (patch) | |
| tree | bc60ff1b392d8e0a77800048e9a2177e46f3e08d /src/cpu/x86 | |
| parent | 5283c337bf6627c7893f4e8203da4b2921951293 (diff) | |
arch/x86: Clean up bootblock assembly
We have identical gdtptr16 and gdtptr. The reference in
gdtptr_offset calculation is not accounted for when
considering --gc-sections, so to support linking
gdt_init.S separately add dummy use of gdtptr symbol.
Realmode execution already accessed gdt that was located
outside [_start16bit,_estart16bit] region. Remove latter
symbol as the former was not really a start of region,
but entry point symbol.
With the romcc bootblock solution, entry32.inc may have
been linked into romstage before, but the !ENV_BOOTBLOCK
case seems obsolete now.
Change-Id: I0a3f6aeb217ca4e38b936b8c9ec8b0b69732cbb9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47964
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/cpu/x86')
| -rw-r--r-- | src/cpu/x86/16bit/entry16.inc | 13 | ||||
| -rw-r--r-- | src/cpu/x86/32bit/entry32.inc | 20 |
2 files changed, 4 insertions, 29 deletions
diff --git a/src/cpu/x86/16bit/entry16.inc b/src/cpu/x86/16bit/entry16.inc index 13d12beb66..2665cc69ae 100644 --- a/src/cpu/x86/16bit/entry16.inc +++ b/src/cpu/x86/16bit/entry16.inc @@ -108,7 +108,7 @@ _start16bit: movw $nullidt_offset, %bx subw %ax, %bx lidt %cs:(%bx) - movw $gdtptr16_offset, %bx + movw $gdtptr_offset, %bx subw %ax, %bx lgdtl %cs:(%bx) @@ -127,11 +127,8 @@ _start16bit: * The gdt is defined in entry32.inc, it has a 4 Gb code segment * at 0x08, and a 4 GB data segment at 0x10; */ -.align 4 -.globl gdtptr16 -gdtptr16: - .word gdt_end - gdt -1 /* compute the table limit */ - .long gdt /* we know the offset */ +__gdtptr: + .long gdtptr .align 4 .globl nullidt @@ -139,7 +136,3 @@ nullidt: .word 0 /* limit */ .long 0 .word 0 - -.globl _estart16bit -_estart16bit: - .code32 diff --git a/src/cpu/x86/32bit/entry32.inc b/src/cpu/x86/32bit/entry32.inc index be67b534cb..85094483e5 100644 --- a/src/cpu/x86/32bit/entry32.inc +++ b/src/cpu/x86/32bit/entry32.inc @@ -8,29 +8,11 @@ .code32 /* - * When we come here we are in protected mode. We expand - * the stack and copies the data segment from ROM to the - * memory. - * - * After that, we call the chipset bootstrap routine that - * does what is left of the chipset initialization. - * + * When we come here we are in protected mode. * NOTE aligned to 4 so that we are sure that the prefetch * cache will be reloaded. - * - * In the bootblock there is already a ljmp to __protected_start and - * the reset vector jumps to symbol _start16bit in entry16.inc from - * the reset vectors's symbol which is _start. Therefore, don't - * expose the _start symbol for bootblock. */ .align 4 -#if !ENV_BOOTBLOCK -.globl _start -_start: -#endif - - lgdt %cs:gdtptr - ljmp $ROM_CODE_SEG, $__protected_start __protected_start: /* Save the BIST value */ |