* Leave a valid 64-bit IDT installed during runtime EFI mixed mode
calls to avoid triple faults if an NMI/MCE is received.
* Revert Ard's change to the libstub get_memory_map() that went into
the v3.20 merge window because it causes boot regressions on Qemu and
Xen.
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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent
Pull EFI fixes from Matt Fleming:
" - Leave a valid 64-bit IDT installed during runtime EFI mixed mode
calls to avoid triple faults if an NMI/MCE is received.
- Revert Ard's change to the libstub get_memory_map() that went into
the v3.20 merge window because it causes boot regressions on Qemu and
Xen. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
commit
829bf7af64
@ -49,6 +49,7 @@ $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
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vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
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$(objtree)/drivers/firmware/efi/libstub/lib.a
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vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
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$(obj)/vmlinux: $(vmlinux-objs-y) FORCE
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$(call if_changed,ld)
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@ -3,28 +3,3 @@
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#include <asm/processor-flags.h>
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#include "../../platform/efi/efi_stub_64.S"
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#ifdef CONFIG_EFI_MIXED
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.code64
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.text
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ENTRY(efi64_thunk)
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push %rbp
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push %rbx
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subq $16, %rsp
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leaq efi_exit32(%rip), %rax
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movl %eax, 8(%rsp)
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leaq efi_gdt64(%rip), %rax
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movl %eax, 4(%rsp)
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movl %eax, 2(%rax) /* Fixup the gdt base address */
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leaq efi32_boot_gdt(%rip), %rax
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movl %eax, (%rsp)
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call __efi64_thunk
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addq $16, %rsp
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pop %rbx
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pop %rbp
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ret
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ENDPROC(efi64_thunk)
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#endif /* CONFIG_EFI_MIXED */
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196
arch/x86/boot/compressed/efi_thunk_64.S
Normal file
196
arch/x86/boot/compressed/efi_thunk_64.S
Normal file
@ -0,0 +1,196 @@
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/*
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* Copyright (C) 2014, 2015 Intel Corporation; author Matt Fleming
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*
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* Early support for invoking 32-bit EFI services from a 64-bit kernel.
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*
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* Because this thunking occurs before ExitBootServices() we have to
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* restore the firmware's 32-bit GDT before we make EFI serivce calls,
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* since the firmware's 32-bit IDT is still currently installed and it
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* needs to be able to service interrupts.
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*
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* On the plus side, we don't have to worry about mangling 64-bit
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* addresses into 32-bits because we're executing with an identify
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* mapped pagetable and haven't transitioned to 64-bit virtual addresses
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* yet.
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*/
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#include <linux/linkage.h>
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#include <asm/msr.h>
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#include <asm/page_types.h>
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#include <asm/processor-flags.h>
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#include <asm/segment.h>
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.code64
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.text
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ENTRY(efi64_thunk)
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push %rbp
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push %rbx
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subq $8, %rsp
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leaq efi_exit32(%rip), %rax
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movl %eax, 4(%rsp)
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leaq efi_gdt64(%rip), %rax
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movl %eax, (%rsp)
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movl %eax, 2(%rax) /* Fixup the gdt base address */
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movl %ds, %eax
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push %rax
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movl %es, %eax
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push %rax
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movl %ss, %eax
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push %rax
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/*
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* Convert x86-64 ABI params to i386 ABI
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*/
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subq $32, %rsp
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movl %esi, 0x0(%rsp)
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movl %edx, 0x4(%rsp)
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movl %ecx, 0x8(%rsp)
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movq %r8, %rsi
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movl %esi, 0xc(%rsp)
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movq %r9, %rsi
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movl %esi, 0x10(%rsp)
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sgdt save_gdt(%rip)
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leaq 1f(%rip), %rbx
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movq %rbx, func_rt_ptr(%rip)
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|
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/*
|
||||
* Switch to gdt with 32-bit segments. This is the firmware GDT
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* that was installed when the kernel started executing. This
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* pointer was saved at the EFI stub entry point in head_64.S.
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*/
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leaq efi32_boot_gdt(%rip), %rax
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lgdt (%rax)
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pushq $__KERNEL_CS
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leaq efi_enter32(%rip), %rax
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pushq %rax
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lretq
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1: addq $32, %rsp
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lgdt save_gdt(%rip)
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pop %rbx
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movl %ebx, %ss
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pop %rbx
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movl %ebx, %es
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pop %rbx
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movl %ebx, %ds
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/*
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* Convert 32-bit status code into 64-bit.
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*/
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test %rax, %rax
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jz 1f
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movl %eax, %ecx
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andl $0x0fffffff, %ecx
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andl $0xf0000000, %eax
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shl $32, %rax
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or %rcx, %rax
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1:
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addq $8, %rsp
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pop %rbx
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pop %rbp
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ret
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ENDPROC(efi64_thunk)
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ENTRY(efi_exit32)
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movq func_rt_ptr(%rip), %rax
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push %rax
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mov %rdi, %rax
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ret
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ENDPROC(efi_exit32)
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|
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.code32
|
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/*
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* EFI service pointer must be in %edi.
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*
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* The stack should represent the 32-bit calling convention.
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*/
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ENTRY(efi_enter32)
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movl $__KERNEL_DS, %eax
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %ss
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/* Reload pgtables */
|
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movl %cr3, %eax
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movl %eax, %cr3
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/* Disable paging */
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movl %cr0, %eax
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btrl $X86_CR0_PG_BIT, %eax
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movl %eax, %cr0
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|
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/* Disable long mode via EFER */
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movl $MSR_EFER, %ecx
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rdmsr
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btrl $_EFER_LME, %eax
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wrmsr
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call *%edi
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/* We must preserve return value */
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movl %eax, %edi
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/*
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* Some firmware will return with interrupts enabled. Be sure to
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* disable them before we switch GDTs.
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*/
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cli
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movl 56(%esp), %eax
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movl %eax, 2(%eax)
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lgdtl (%eax)
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movl %cr4, %eax
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btsl $(X86_CR4_PAE_BIT), %eax
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movl %eax, %cr4
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movl %cr3, %eax
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movl %eax, %cr3
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movl $MSR_EFER, %ecx
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rdmsr
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btsl $_EFER_LME, %eax
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wrmsr
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xorl %eax, %eax
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lldt %ax
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movl 60(%esp), %eax
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pushl $__KERNEL_CS
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pushl %eax
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/* Enable paging */
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movl %cr0, %eax
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btsl $X86_CR0_PG_BIT, %eax
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movl %eax, %cr0
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lret
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ENDPROC(efi_enter32)
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.data
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.balign 8
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.global efi32_boot_gdt
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efi32_boot_gdt: .word 0
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.quad 0
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save_gdt: .word 0
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.quad 0
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func_rt_ptr: .quad 0
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.global efi_gdt64
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efi_gdt64:
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.word efi_gdt64_end - efi_gdt64
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.long 0 /* Filled out by user */
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.word 0
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.quad 0x0000000000000000 /* NULL descriptor */
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.quad 0x00af9a000000ffff /* __KERNEL_CS */
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.quad 0x00cf92000000ffff /* __KERNEL_DS */
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.quad 0x0080890000000000 /* TS descriptor */
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.quad 0x0000000000000000 /* TS continued */
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efi_gdt64_end:
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@ -91,167 +91,6 @@ ENTRY(efi_call)
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ret
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ENDPROC(efi_call)
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#ifdef CONFIG_EFI_MIXED
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|
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/*
|
||||
* We run this function from the 1:1 mapping.
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*
|
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* This function must be invoked with a 1:1 mapped stack.
|
||||
*/
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ENTRY(__efi64_thunk)
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movl %ds, %eax
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push %rax
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movl %es, %eax
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push %rax
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||||
movl %ss, %eax
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push %rax
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subq $32, %rsp
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movl %esi, 0x0(%rsp)
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movl %edx, 0x4(%rsp)
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movl %ecx, 0x8(%rsp)
|
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movq %r8, %rsi
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movl %esi, 0xc(%rsp)
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movq %r9, %rsi
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movl %esi, 0x10(%rsp)
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sgdt save_gdt(%rip)
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|
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leaq 1f(%rip), %rbx
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movq %rbx, func_rt_ptr(%rip)
|
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|
||||
/* Switch to gdt with 32-bit segments */
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movl 64(%rsp), %eax
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lgdt (%rax)
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|
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leaq efi_enter32(%rip), %rax
|
||||
pushq $__KERNEL_CS
|
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pushq %rax
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||||
lretq
|
||||
|
||||
1: addq $32, %rsp
|
||||
|
||||
lgdt save_gdt(%rip)
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|
||||
pop %rbx
|
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movl %ebx, %ss
|
||||
pop %rbx
|
||||
movl %ebx, %es
|
||||
pop %rbx
|
||||
movl %ebx, %ds
|
||||
|
||||
/*
|
||||
* Convert 32-bit status code into 64-bit.
|
||||
*/
|
||||
test %rax, %rax
|
||||
jz 1f
|
||||
movl %eax, %ecx
|
||||
andl $0x0fffffff, %ecx
|
||||
andl $0xf0000000, %eax
|
||||
shl $32, %rax
|
||||
or %rcx, %rax
|
||||
1:
|
||||
ret
|
||||
ENDPROC(__efi64_thunk)
|
||||
|
||||
ENTRY(efi_exit32)
|
||||
movq func_rt_ptr(%rip), %rax
|
||||
push %rax
|
||||
mov %rdi, %rax
|
||||
ret
|
||||
ENDPROC(efi_exit32)
|
||||
|
||||
.code32
|
||||
/*
|
||||
* EFI service pointer must be in %edi.
|
||||
*
|
||||
* The stack should represent the 32-bit calling convention.
|
||||
*/
|
||||
ENTRY(efi_enter32)
|
||||
movl $__KERNEL_DS, %eax
|
||||
movl %eax, %ds
|
||||
movl %eax, %es
|
||||
movl %eax, %ss
|
||||
|
||||
/* Reload pgtables */
|
||||
movl %cr3, %eax
|
||||
movl %eax, %cr3
|
||||
|
||||
/* Disable paging */
|
||||
movl %cr0, %eax
|
||||
btrl $X86_CR0_PG_BIT, %eax
|
||||
movl %eax, %cr0
|
||||
|
||||
/* Disable long mode via EFER */
|
||||
movl $MSR_EFER, %ecx
|
||||
rdmsr
|
||||
btrl $_EFER_LME, %eax
|
||||
wrmsr
|
||||
|
||||
call *%edi
|
||||
|
||||
/* We must preserve return value */
|
||||
movl %eax, %edi
|
||||
|
||||
/*
|
||||
* Some firmware will return with interrupts enabled. Be sure to
|
||||
* disable them before we switch GDTs.
|
||||
*/
|
||||
cli
|
||||
|
||||
movl 68(%esp), %eax
|
||||
movl %eax, 2(%eax)
|
||||
lgdtl (%eax)
|
||||
|
||||
movl %cr4, %eax
|
||||
btsl $(X86_CR4_PAE_BIT), %eax
|
||||
movl %eax, %cr4
|
||||
|
||||
movl %cr3, %eax
|
||||
movl %eax, %cr3
|
||||
|
||||
movl $MSR_EFER, %ecx
|
||||
rdmsr
|
||||
btsl $_EFER_LME, %eax
|
||||
wrmsr
|
||||
|
||||
xorl %eax, %eax
|
||||
lldt %ax
|
||||
|
||||
movl 72(%esp), %eax
|
||||
pushl $__KERNEL_CS
|
||||
pushl %eax
|
||||
|
||||
/* Enable paging */
|
||||
movl %cr0, %eax
|
||||
btsl $X86_CR0_PG_BIT, %eax
|
||||
movl %eax, %cr0
|
||||
lret
|
||||
ENDPROC(efi_enter32)
|
||||
|
||||
.data
|
||||
.balign 8
|
||||
.global efi32_boot_gdt
|
||||
efi32_boot_gdt: .word 0
|
||||
.quad 0
|
||||
|
||||
save_gdt: .word 0
|
||||
.quad 0
|
||||
func_rt_ptr: .quad 0
|
||||
|
||||
.global efi_gdt64
|
||||
efi_gdt64:
|
||||
.word efi_gdt64_end - efi_gdt64
|
||||
.long 0 /* Filled out by user */
|
||||
.word 0
|
||||
.quad 0x0000000000000000 /* NULL descriptor */
|
||||
.quad 0x00af9a000000ffff /* __KERNEL_CS */
|
||||
.quad 0x00cf92000000ffff /* __KERNEL_DS */
|
||||
.quad 0x0080890000000000 /* TS descriptor */
|
||||
.quad 0x0000000000000000 /* TS continued */
|
||||
efi_gdt64_end:
|
||||
#endif /* CONFIG_EFI_MIXED */
|
||||
|
||||
.data
|
||||
ENTRY(efi_scratch)
|
||||
.fill 3,8,0
|
||||
|
||||
@ -1,9 +1,26 @@
|
||||
/*
|
||||
* Copyright (C) 2014 Intel Corporation; author Matt Fleming
|
||||
*
|
||||
* Support for invoking 32-bit EFI runtime services from a 64-bit
|
||||
* kernel.
|
||||
*
|
||||
* The below thunking functions are only used after ExitBootServices()
|
||||
* has been called. This simplifies things considerably as compared with
|
||||
* the early EFI thunking because we can leave all the kernel state
|
||||
* intact (GDT, IDT, etc) and simply invoke the the 32-bit EFI runtime
|
||||
* services from __KERNEL32_CS. This means we can continue to service
|
||||
* interrupts across an EFI mixed mode call.
|
||||
*
|
||||
* We do however, need to handle the fact that we're running in a full
|
||||
* 64-bit virtual address space. Things like the stack and instruction
|
||||
* addresses need to be accessible by the 32-bit firmware, so we rely on
|
||||
* using the identity mappings in the EFI page table to access the stack
|
||||
* and kernel text (see efi_setup_page_tables()).
|
||||
*/
|
||||
|
||||
#include <linux/linkage.h>
|
||||
#include <asm/page_types.h>
|
||||
#include <asm/segment.h>
|
||||
|
||||
.text
|
||||
.code64
|
||||
@ -33,14 +50,6 @@ ENTRY(efi64_thunk)
|
||||
leaq efi_exit32(%rip), %rbx
|
||||
subq %rax, %rbx
|
||||
movl %ebx, 8(%rsp)
|
||||
leaq efi_gdt64(%rip), %rbx
|
||||
subq %rax, %rbx
|
||||
movl %ebx, 2(%ebx)
|
||||
movl %ebx, 4(%rsp)
|
||||
leaq efi_gdt32(%rip), %rbx
|
||||
subq %rax, %rbx
|
||||
movl %ebx, 2(%ebx)
|
||||
movl %ebx, (%rsp)
|
||||
|
||||
leaq __efi64_thunk(%rip), %rbx
|
||||
subq %rax, %rbx
|
||||
@ -52,14 +61,92 @@ ENTRY(efi64_thunk)
|
||||
retq
|
||||
ENDPROC(efi64_thunk)
|
||||
|
||||
.data
|
||||
efi_gdt32:
|
||||
.word efi_gdt32_end - efi_gdt32
|
||||
.long 0 /* Filled out above */
|
||||
.word 0
|
||||
.quad 0x0000000000000000 /* NULL descriptor */
|
||||
.quad 0x00cf9a000000ffff /* __KERNEL_CS */
|
||||
.quad 0x00cf93000000ffff /* __KERNEL_DS */
|
||||
efi_gdt32_end:
|
||||
/*
|
||||
* We run this function from the 1:1 mapping.
|
||||
*
|
||||
* This function must be invoked with a 1:1 mapped stack.
|
||||
*/
|
||||
ENTRY(__efi64_thunk)
|
||||
movl %ds, %eax
|
||||
push %rax
|
||||
movl %es, %eax
|
||||
push %rax
|
||||
movl %ss, %eax
|
||||
push %rax
|
||||
|
||||
subq $32, %rsp
|
||||
movl %esi, 0x0(%rsp)
|
||||
movl %edx, 0x4(%rsp)
|
||||
movl %ecx, 0x8(%rsp)
|
||||
movq %r8, %rsi
|
||||
movl %esi, 0xc(%rsp)
|
||||
movq %r9, %rsi
|
||||
movl %esi, 0x10(%rsp)
|
||||
|
||||
leaq 1f(%rip), %rbx
|
||||
movq %rbx, func_rt_ptr(%rip)
|
||||
|
||||
/* Switch to 32-bit descriptor */
|
||||
pushq $__KERNEL32_CS
|
||||
leaq efi_enter32(%rip), %rax
|
||||
pushq %rax
|
||||
lretq
|
||||
|
||||
1: addq $32, %rsp
|
||||
|
||||
pop %rbx
|
||||
movl %ebx, %ss
|
||||
pop %rbx
|
||||
movl %ebx, %es
|
||||
pop %rbx
|
||||
movl %ebx, %ds
|
||||
|
||||
/*
|
||||
* Convert 32-bit status code into 64-bit.
|
||||
*/
|
||||
test %rax, %rax
|
||||
jz 1f
|
||||
movl %eax, %ecx
|
||||
andl $0x0fffffff, %ecx
|
||||
andl $0xf0000000, %eax
|
||||
shl $32, %rax
|
||||
or %rcx, %rax
|
||||
1:
|
||||
ret
|
||||
ENDPROC(__efi64_thunk)
|
||||
|
||||
ENTRY(efi_exit32)
|
||||
movq func_rt_ptr(%rip), %rax
|
||||
push %rax
|
||||
mov %rdi, %rax
|
||||
ret
|
||||
ENDPROC(efi_exit32)
|
||||
|
||||
.code32
|
||||
/*
|
||||
* EFI service pointer must be in %edi.
|
||||
*
|
||||
* The stack should represent the 32-bit calling convention.
|
||||
*/
|
||||
ENTRY(efi_enter32)
|
||||
movl $__KERNEL_DS, %eax
|
||||
movl %eax, %ds
|
||||
movl %eax, %es
|
||||
movl %eax, %ss
|
||||
|
||||
call *%edi
|
||||
|
||||
/* We must preserve return value */
|
||||
movl %eax, %edi
|
||||
|
||||
movl 72(%esp), %eax
|
||||
pushl $__KERNEL_CS
|
||||
pushl %eax
|
||||
|
||||
lret
|
||||
ENDPROC(efi_enter32)
|
||||
|
||||
.data
|
||||
.balign 8
|
||||
func_rt_ptr: .quad 0
|
||||
efi_saved_sp: .quad 0
|
||||
|
||||
@ -66,29 +66,25 @@ efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
|
||||
unsigned long key;
|
||||
u32 desc_version;
|
||||
|
||||
*map_size = 0;
|
||||
*desc_size = 0;
|
||||
key = 0;
|
||||
status = efi_call_early(get_memory_map, map_size, NULL,
|
||||
&key, desc_size, &desc_version);
|
||||
if (status != EFI_BUFFER_TOO_SMALL)
|
||||
return EFI_LOAD_ERROR;
|
||||
|
||||
*map_size = sizeof(*m) * 32;
|
||||
again:
|
||||
/*
|
||||
* Add an additional efi_memory_desc_t because we're doing an
|
||||
* allocation which may be in a new descriptor region.
|
||||
*/
|
||||
*map_size += *desc_size;
|
||||
*map_size += sizeof(*m);
|
||||
status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
|
||||
*map_size, (void **)&m);
|
||||
if (status != EFI_SUCCESS)
|
||||
goto fail;
|
||||
|
||||
*desc_size = 0;
|
||||
key = 0;
|
||||
status = efi_call_early(get_memory_map, map_size, m,
|
||||
&key, desc_size, &desc_version);
|
||||
if (status == EFI_BUFFER_TOO_SMALL) {
|
||||
efi_call_early(free_pool, m);
|
||||
return EFI_LOAD_ERROR;
|
||||
goto again;
|
||||
}
|
||||
|
||||
if (status != EFI_SUCCESS)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user