| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <types.h> |
| #include <string.h> |
| #include <cbmem.h> |
| #include <commonlib/helpers.h> |
| #include <console/console.h> |
| #include <cpu/x86/gdt.h> |
| |
| /* i386 lgdt argument */ |
| struct gdtarg { |
| u16 limit; |
| #ifdef __x86_64__ |
| u64 base; |
| #else |
| u32 base; |
| #endif |
| } __packed; |
| |
| /* |
| * Copy GDT to new location and reload it. |
| * FIXME: We only do this for BSP CPU. |
| */ |
| static void move_gdt(int is_recovery) |
| { |
| void *newgdt; |
| u16 num_gdt_bytes; |
| struct gdtarg gdtarg; |
| |
| /* ramstage is already in high memory. No need to use a new gdt. */ |
| if (CONFIG(RELOCATABLE_RAMSTAGE)) |
| return; |
| |
| newgdt = cbmem_find(CBMEM_ID_GDT); |
| num_gdt_bytes = (uintptr_t)&gdt_end - (uintptr_t)&gdt; |
| if (!newgdt) { |
| newgdt = cbmem_add(CBMEM_ID_GDT, ALIGN_UP(num_gdt_bytes, 512)); |
| if (!newgdt) { |
| printk(BIOS_ERR, "Error: Could not relocate GDT.\n"); |
| return; |
| } |
| memcpy((void *)newgdt, &gdt, num_gdt_bytes); |
| } |
| printk(BIOS_DEBUG, "Moving GDT to %p...", newgdt); |
| |
| gdtarg.base = (uintptr_t)newgdt; |
| gdtarg.limit = num_gdt_bytes - 1; |
| |
| __asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg)); |
| printk(BIOS_DEBUG, "ok\n"); |
| } |
| RAMSTAGE_CBMEM_INIT_HOOK(move_gdt) |