linux/arch/x86/kernel/efi_stub_64.S
Huang, Ying 5b83683f32 x86: EFI runtime service support
This patch adds basic runtime services support for EFI x86_64 system.  The
main file of the patch is the addition of efi_64.c for x86_64.  This file is
modeled after the EFI IA32 avatar.  EFI runtime services initialization are
implemented in efi_64.c.  Some x86_64 specifics are worth noting here.  On
x86_64, parameters passed to EFI firmware services need to follow the EFI
calling convention.  For this purpose, a set of functions named efi_call<x>
(<x> is the number of parameters) are implemented.  EFI function calls are
wrapped before calling the firmware service.  The duplicated code between
efi_32.c and efi_64.c is placed in efi.c to remove them from efi_32.c.

Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:31:19 +01:00

110 lines
1.7 KiB
ArmAsm

/*
* Function calling ABI conversion from Linux to EFI for x86_64
*
* Copyright (C) 2007 Intel Corp
* Bibo Mao <bibo.mao@intel.com>
* Huang Ying <ying.huang@intel.com>
*/
#include <linux/linkage.h>
#define SAVE_XMM \
mov %rsp, %rax; \
subq $0x70, %rsp; \
and $~0xf, %rsp; \
mov %rax, (%rsp); \
mov %cr0, %rax; \
clts; \
mov %rax, 0x8(%rsp); \
movaps %xmm0, 0x60(%rsp); \
movaps %xmm1, 0x50(%rsp); \
movaps %xmm2, 0x40(%rsp); \
movaps %xmm3, 0x30(%rsp); \
movaps %xmm4, 0x20(%rsp); \
movaps %xmm5, 0x10(%rsp)
#define RESTORE_XMM \
movaps 0x60(%rsp), %xmm0; \
movaps 0x50(%rsp), %xmm1; \
movaps 0x40(%rsp), %xmm2; \
movaps 0x30(%rsp), %xmm3; \
movaps 0x20(%rsp), %xmm4; \
movaps 0x10(%rsp), %xmm5; \
mov 0x8(%rsp), %rsi; \
mov %rsi, %cr0; \
mov (%rsp), %rsp
ENTRY(efi_call0)
SAVE_XMM
subq $32, %rsp
call *%rdi
addq $32, %rsp
RESTORE_XMM
ret
ENTRY(efi_call1)
SAVE_XMM
subq $32, %rsp
mov %rsi, %rcx
call *%rdi
addq $32, %rsp
RESTORE_XMM
ret
ENTRY(efi_call2)
SAVE_XMM
subq $32, %rsp
mov %rsi, %rcx
call *%rdi
addq $32, %rsp
RESTORE_XMM
ret
ENTRY(efi_call3)
SAVE_XMM
subq $32, %rsp
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
addq $32, %rsp
RESTORE_XMM
ret
ENTRY(efi_call4)
SAVE_XMM
subq $32, %rsp
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
addq $32, %rsp
RESTORE_XMM
ret
ENTRY(efi_call5)
SAVE_XMM
subq $48, %rsp
mov %r9, 32(%rsp)
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
addq $48, %rsp
RESTORE_XMM
ret
ENTRY(efi_call6)
SAVE_XMM
mov (%rsp), %rax
mov 8(%rax), %rax
subq $48, %rsp
mov %r9, 32(%rsp)
mov %rax, 40(%rsp)
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
addq $48, %rsp
RESTORE_XMM
ret