2024-09-09 08:52:07 +00:00
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/*
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* Function calling ABI conversion from Linux to EFI for x86_64
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*
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* Copyright (C) 2007 Intel Corp
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* Bibo Mao <bibo.mao@intel.com>
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* Huang Ying <ying.huang@intel.com>
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*/
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#include <linux/linkage.h>
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2024-09-09 08:57:42 +00:00
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#include <asm/segment.h>
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#include <asm/msr.h>
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#include <asm/processor-flags.h>
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#include <asm/page_types.h>
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2024-09-09 08:52:07 +00:00
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#define SAVE_XMM \
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mov %rsp, %rax; \
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subq $0x70, %rsp; \
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and $~0xf, %rsp; \
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mov %rax, (%rsp); \
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mov %cr0, %rax; \
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clts; \
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mov %rax, 0x8(%rsp); \
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movaps %xmm0, 0x60(%rsp); \
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movaps %xmm1, 0x50(%rsp); \
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movaps %xmm2, 0x40(%rsp); \
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movaps %xmm3, 0x30(%rsp); \
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movaps %xmm4, 0x20(%rsp); \
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movaps %xmm5, 0x10(%rsp)
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#define RESTORE_XMM \
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movaps 0x60(%rsp), %xmm0; \
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movaps 0x50(%rsp), %xmm1; \
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movaps 0x40(%rsp), %xmm2; \
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movaps 0x30(%rsp), %xmm3; \
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movaps 0x20(%rsp), %xmm4; \
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movaps 0x10(%rsp), %xmm5; \
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mov 0x8(%rsp), %rsi; \
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mov %rsi, %cr0; \
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mov (%rsp), %rsp
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2024-09-09 08:57:42 +00:00
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/* stolen from gcc */
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.macro FLUSH_TLB_ALL
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movq %r15, efi_scratch(%rip)
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movq %r14, efi_scratch+8(%rip)
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movq %cr4, %r15
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movq %r15, %r14
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andb $0x7f, %r14b
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movq %r14, %cr4
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movq %r15, %cr4
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movq efi_scratch+8(%rip), %r14
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movq efi_scratch(%rip), %r15
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.endm
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2024-09-09 08:52:07 +00:00
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2024-09-09 08:57:42 +00:00
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.macro SWITCH_PGT
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cmpb $0, efi_scratch+24(%rip)
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je 1f
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movq %r15, efi_scratch(%rip) # r15
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# save previous CR3
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movq %cr3, %r15
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movq %r15, efi_scratch+8(%rip) # prev_cr3
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movq efi_scratch+16(%rip), %r15 # EFI pgt
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movq %r15, %cr3
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1:
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.endm
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2024-09-09 08:52:07 +00:00
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2024-09-09 08:57:42 +00:00
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.macro RESTORE_PGT
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cmpb $0, efi_scratch+24(%rip)
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je 2f
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movq efi_scratch+8(%rip), %r15
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movq %r15, %cr3
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movq efi_scratch(%rip), %r15
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FLUSH_TLB_ALL
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2:
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.endm
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2024-09-09 08:52:07 +00:00
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2024-09-09 08:57:42 +00:00
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ENTRY(efi_call)
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2024-09-09 08:52:07 +00:00
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SAVE_XMM
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mov (%rsp), %rax
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mov 8(%rax), %rax
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subq $48, %rsp
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mov %r9, 32(%rsp)
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mov %rax, 40(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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mov %rsi, %rcx
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2024-09-09 08:57:42 +00:00
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SWITCH_PGT
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2024-09-09 08:52:07 +00:00
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call *%rdi
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2024-09-09 08:57:42 +00:00
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RESTORE_PGT
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2024-09-09 08:52:07 +00:00
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addq $48, %rsp
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RESTORE_XMM
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ret
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2024-09-09 08:57:42 +00:00
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ENDPROC(efi_call)
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.data
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ENTRY(efi_scratch)
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.fill 3,8,0
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.byte 0
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.quad 0
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