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root/arch/x86/kernel/efi_stub_64.S

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/*
 * 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

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