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Diffstat (limited to 'arch/x86/boot/compressed/efi_mixed.S')
-rw-r--r--arch/x86/boot/compressed/efi_mixed.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/efi_mixed.S b/arch/x86/boot/compressed/efi_mixed.S
index f4e22ef774ab..719e939050cb 100644
--- a/arch/x86/boot/compressed/efi_mixed.S
+++ b/arch/x86/boot/compressed/efi_mixed.S
@@ -49,6 +49,11 @@ SYM_FUNC_START(startup_64_mixed_mode)
lea efi32_boot_args(%rip), %rdx
mov 0(%rdx), %edi
mov 4(%rdx), %esi
+
+ /* Switch to the firmware's stack */
+ movl efi32_boot_sp(%rip), %esp
+ andl $~7, %esp
+
#ifdef CONFIG_EFI_HANDOVER_PROTOCOL
mov 8(%rdx), %edx // saved bootparams pointer
test %edx, %edx
@@ -254,6 +259,9 @@ SYM_FUNC_START_LOCAL(efi32_entry)
/* Store firmware IDT descriptor */
sidtl (efi32_boot_idt - 1b)(%ebx)
+ /* Store firmware stack pointer */
+ movl %esp, (efi32_boot_sp - 1b)(%ebx)
+
/* Store boot arguments */
leal (efi32_boot_args - 1b)(%ebx), %ebx
movl %ecx, 0(%ebx)
@@ -318,5 +326,6 @@ SYM_DATA_END(efi32_boot_idt)
SYM_DATA_LOCAL(efi32_boot_cs, .word 0)
SYM_DATA_LOCAL(efi32_boot_ds, .word 0)
+SYM_DATA_LOCAL(efi32_boot_sp, .long 0)
SYM_DATA_LOCAL(efi32_boot_args, .long 0, 0, 0)
SYM_DATA(efi_is64, .byte 1)