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x86: Don't copy the cpu_call64() function to a hardcoded address

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Before jumping to 64-bit U-Boot proper, SPL copies the cpu_call64()
function to a hardcoded address 0x3000000. This can have potential
conflicts with application usage. Switch the destination address
to be allocated from the heap to avoid such risk.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2019-01-31 08:22:13 -08:00
parent dbb0696ba0
commit 9168326037
2 changed files with 12 additions and 3 deletions
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4
arch/x86/cpu/i386/call64.S
View file

@ -79,6 +79,10 @@ lret_target:
mov %eax, %eax /* Clear bits 63:32 */
jmp *%eax /* Jump to the 64-bit target */
.globl call64_stub_size
call64_stub_size:
.long . - cpu_call64
.data
.align 16
.globl gdt64

11
arch/x86/cpu/i386/cpu.c
View file

@ -523,18 +523,23 @@ int cpu_jump_to_64bit_uboot(ulong target)
typedef void (*func_t)(ulong pgtable, ulong setup_base, ulong target);
uint32_t *pgtable;
func_t func;
char *ptr;
pgtable = (uint32_t *)PAGETABLE_BASE;
build_pagetable(pgtable);
/* TODO(sjg@chromium.org): Find a better place for this */
char *ptr = (char *)0x3000000;
extern long call64_stub_size;
ptr = malloc(call64_stub_size);
if (!ptr) {
printf("Failed to allocate the cpu_call64 stub\n");
return -ENOMEM;
}
char *gdt = (char *)0x3100000;
extern char gdt64[];
memcpy(ptr, cpu_call64, 0x1000);
memcpy(ptr, cpu_call64, call64_stub_size);
memcpy(gdt, gdt64, 0x100);
/*