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/* SPDX-License-Identifier: GPL-2.0-only */
#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)
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