24b5e20f11
Pull EFI updates from Ingo Molnar:
"The main changes are:
- Use separate EFI page tables when executing EFI firmware code.
This isolates the EFI context from the rest of the kernel, which
has security and general robustness advantages. (Matt Fleming)
- Run regular UEFI firmware with interrupts enabled. This is already
the status quo under other OSs. (Ard Biesheuvel)
- Various x86 EFI enhancements, such as the use of non-executable
attributes for EFI memory mappings. (Sai Praneeth Prakhya)
- Various arm64 UEFI enhancements. (Ard Biesheuvel)
- ... various fixes and cleanups.
The separate EFI page tables feature got delayed twice already,
because it's an intrusive change and we didn't feel confident about
it - third time's the charm we hope!"
* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (37 commits)
x86/mm/pat: Fix boot crash when 1GB pages are not supported by the CPU
x86/efi: Only map kernel text for EFI mixed mode
x86/efi: Map EFI_MEMORY_{XP,RO} memory region bits to EFI page tables
x86/mm/pat: Don't implicitly allow _PAGE_RW in kernel_map_pages_in_pgd()
efi/arm*: Perform hardware compatibility check
efi/arm64: Check for h/w support before booting a >4 KB granular kernel
efi/arm: Check for LPAE support before booting a LPAE kernel
efi/arm-init: Use read-only early mappings
efi/efistub: Prevent __init annotations from being used
arm64/vmlinux.lds.S: Handle .init.rodata.xxx and .init.bss sections
efi/arm64: Drop __init annotation from handle_kernel_image()
x86/mm/pat: Use _PAGE_GLOBAL bit for EFI page table mappings
efi/runtime-wrappers: Run UEFI Runtime Services with interrupts enabled
efi: Reformat GUID tables to follow the format in UEFI spec
efi: Add Persistent Memory type name
efi: Add NV memory attribute
x86/efi: Show actual ending addresses in efi_print_memmap
x86/efi/bgrt: Don't ignore the BGRT if the 'valid' bit is 0
efivars: Use to_efivar_entry
efi: Runtime-wrapper: Get rid of the rtc_lock spinlock
...
59 lines
1.2 KiB
ArmAsm
59 lines
1.2 KiB
ArmAsm
/*
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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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#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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#include <asm/frame.h>
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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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ENTRY(efi_call)
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FRAME_BEGIN
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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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call *%rdi
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addq $48, %rsp
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RESTORE_XMM
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FRAME_END
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ret
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ENDPROC(efi_call)
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