| /* |
| * 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> |
| #include <asm/segment.h> |
| #include <asm/msr.h> |
| #include <asm/processor-flags.h> |
| #include <asm/page_types.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 |
| |
| /* stolen from gcc */ |
| .macro FLUSH_TLB_ALL |
| movq %r15, efi_scratch(%rip) |
| movq %r14, efi_scratch+8(%rip) |
| movq %cr4, %r15 |
| movq %r15, %r14 |
| andb $0x7f, %r14b |
| movq %r14, %cr4 |
| movq %r15, %cr4 |
| movq efi_scratch+8(%rip), %r14 |
| movq efi_scratch(%rip), %r15 |
| .endm |
| |
| .macro SWITCH_PGT |
| cmpb $0, efi_scratch+24(%rip) |
| je 1f |
| movq %r15, efi_scratch(%rip) # r15 |
| # save previous CR3 |
| movq %cr3, %r15 |
| movq %r15, efi_scratch+8(%rip) # prev_cr3 |
| movq efi_scratch+16(%rip), %r15 # EFI pgt |
| movq %r15, %cr3 |
| 1: |
| .endm |
| |
| .macro RESTORE_PGT |
| cmpb $0, efi_scratch+24(%rip) |
| je 2f |
| movq efi_scratch+8(%rip), %r15 |
| movq %r15, %cr3 |
| movq efi_scratch(%rip), %r15 |
| FLUSH_TLB_ALL |
| 2: |
| .endm |
| |
| ENTRY(efi_call) |
| 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 |
| SWITCH_PGT |
| call *%rdi |
| RESTORE_PGT |
| addq $48, %rsp |
| RESTORE_XMM |
| ret |
| ENDPROC(efi_call) |
| |
| .data |
| ENTRY(efi_scratch) |
| .fill 3,8,0 |
| .byte 0 |
| .quad 0 |
