arch/x86/kernel/efi_stub_64.S

   1 /*
   2  * Function calling ABI conversion from Linux to EFI for x86_64
   3  *
   4  * Copyright (C) 2007 Intel Corp
   5  *      Bibo Mao <bibo.mao@intel.com>
   6  *      Huang Ying <ying.huang@intel.com>
   7  */
   8
   9 #include <linux/linkage.h>
  10
  11 #define SAVE_XMM                        \
  12         mov %rsp, %rax;                 \
  13         subq $0x70, %rsp;               \
  14         and $~0xf, %rsp;                \
  15         mov %rax, (%rsp);               \
  16         mov %cr0, %rax;                 \
  17         clts;                           \
  18         mov %rax, 0x8(%rsp);            \
  19         movaps %xmm0, 0x60(%rsp);       \
  20         movaps %xmm1, 0x50(%rsp);       \
  21         movaps %xmm2, 0x40(%rsp);       \
  22         movaps %xmm3, 0x30(%rsp);       \
  23         movaps %xmm4, 0x20(%rsp);       \
  24         movaps %xmm5, 0x10(%rsp)
  25
  26 #define RESTORE_XMM                     \
  27         movaps 0x60(%rsp), %xmm0;       \
  28         movaps 0x50(%rsp), %xmm1;       \
  29         movaps 0x40(%rsp), %xmm2;       \
  30         movaps 0x30(%rsp), %xmm3;       \
  31         movaps 0x20(%rsp), %xmm4;       \
  32         movaps 0x10(%rsp), %xmm5;       \
  33         mov 0x8(%rsp), %rsi;            \
  34         mov %rsi, %cr0;                 \
  35         mov (%rsp), %rsp
  36
  37 ENTRY(efi_call0)
  38         SAVE_XMM
  39         subq $32, %rsp
  40         call *%rdi
  41         addq $32, %rsp
  42         RESTORE_XMM
  43         ret
  44 ENDPROC(efi_call0)
  45
  46 ENTRY(efi_call1)
  47         SAVE_XMM
  48         subq $32, %rsp
  49         mov  %rsi, %rcx
  50         call *%rdi
  51         addq $32, %rsp
  52         RESTORE_XMM
  53         ret
  54 ENDPROC(efi_call1)
  55
  56 ENTRY(efi_call2)
  57         SAVE_XMM
  58         subq $32, %rsp
  59         mov  %rsi, %rcx
  60         call *%rdi
  61         addq $32, %rsp
  62         RESTORE_XMM
  63         ret
  64 ENDPROC(efi_call2)
  65
  66 ENTRY(efi_call3)
  67         SAVE_XMM
  68         subq $32, %rsp
  69         mov  %rcx, %r8
  70         mov  %rsi, %rcx
  71         call *%rdi
  72         addq $32, %rsp
  73         RESTORE_XMM
  74         ret
  75 ENDPROC(efi_call3)
  76
  77 ENTRY(efi_call4)
  78         SAVE_XMM
  79         subq $32, %rsp
  80         mov %r8, %r9
  81         mov %rcx, %r8
  82         mov %rsi, %rcx
  83         call *%rdi
  84         addq $32, %rsp
  85         RESTORE_XMM
  86         ret
  87 ENDPROC(efi_call4)
  88
  89 ENTRY(efi_call5)
  90         SAVE_XMM
  91         subq $48, %rsp
  92         mov %r9, 32(%rsp)
  93         mov %r8, %r9
  94         mov %rcx, %r8
  95         mov %rsi, %rcx
  96         call *%rdi
  97         addq $48, %rsp
  98         RESTORE_XMM
  99         ret
 100 ENDPROC(efi_call5)
 101
 102 ENTRY(efi_call6)
 103         SAVE_XMM
 104         mov (%rsp), %rax
 105         mov 8(%rax), %rax
 106         subq $48, %rsp
 107         mov %r9, 32(%rsp)
 108         mov %rax, 40(%rsp)
 109         mov %r8, %r9
 110         mov %rcx, %r8
 111         mov %rsi, %rcx
 112         call *%rdi
 113         addq $48, %rsp
 114         RESTORE_XMM
 115         ret
 116 ENDPROC(efi_call6)