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author | 2020-03-30 16:13:08 -0700 | |
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committer | 2020-03-30 16:13:08 -0700 | |
commit | a776c270a0b2fad6715cb714187e4290cadb9237 (patch) | |
tree | 6221a924a1a388a791c33a9223d62991b18b6515 /arch/arm | |
parent | Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kerne... (diff) | |
parent | efi/libstub/arm: Fix spurious message that an initrd was loaded (diff) | |
download | linux-a776c270a0b2fad6715cb714187e4290cadb9237.tar.gz linux-a776c270a0b2fad6715cb714187e4290cadb9237.tar.bz2 linux-a776c270a0b2fad6715cb714187e4290cadb9237.zip |
Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI updates from Ingo Molnar:
"The EFI changes in this cycle are much larger than usual, for two
(positive) reasons:
- The GRUB project is showing signs of life again, resulting in the
introduction of the generic Linux/UEFI boot protocol, instead of
x86 specific hacks which are increasingly difficult to maintain.
There's hope that all future extensions will now go through that
boot protocol.
- Preparatory work for RISC-V EFI support.
The main changes are:
- Boot time GDT handling changes
- Simplify handling of EFI properties table on arm64
- Generic EFI stub cleanups, to improve command line handling, file
I/O, memory allocation, etc.
- Introduce a generic initrd loading method based on calling back
into the firmware, instead of relying on the x86 EFI handover
protocol or device tree.
- Introduce a mixed mode boot method that does not rely on the x86
EFI handover protocol either, and could potentially be adopted by
other architectures (if another one ever surfaces where one
execution mode is a superset of another)
- Clean up the contents of 'struct efi', and move out everything that
doesn't need to be stored there.
- Incorporate support for UEFI spec v2.8A changes that permit
firmware implementations to return EFI_UNSUPPORTED from UEFI
runtime services at OS runtime, and expose a mask of which ones are
supported or unsupported via a configuration table.
- Partial fix for the lack of by-VA cache maintenance in the
decompressor on 32-bit ARM.
- Changes to load device firmware from EFI boot service memory
regions
- Various documentation updates and minor code cleanups and fixes"
* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (114 commits)
efi/libstub/arm: Fix spurious message that an initrd was loaded
efi/libstub/arm64: Avoid image_base value from efi_loaded_image
partitions/efi: Fix partition name parsing in GUID partition entry
efi/x86: Fix cast of image argument
efi/libstub/x86: Use ULONG_MAX as upper bound for all allocations
efi: Fix a mistype in comments mentioning efivar_entry_iter_begin()
efi/libstub: Avoid linking libstub/lib-ksyms.o into vmlinux
efi/x86: Preserve %ebx correctly in efi_set_virtual_address_map()
efi/x86: Ignore the memory attributes table on i386
efi/x86: Don't relocate the kernel unless necessary
efi/x86: Remove extra headroom for setup block
efi/x86: Add kernel preferred address to PE header
efi/x86: Decompress at start of PE image load address
x86/boot/compressed/32: Save the output address instead of recalculating it
efi/libstub/x86: Deal with exit() boot service returning
x86/boot: Use unsigned comparison for addresses
efi/x86: Avoid using code32_start
efi/x86: Make efi32_pe_entry() more readable
efi/x86: Respect 32-bit ABI in efi32_pe_entry()
efi/x86: Annotate the LOADED_IMAGE_PROTOCOL_GUID with SYM_DATA
...
Diffstat (limited to 'arch/arm')
-rw-r--r-- | arch/arm/boot/compressed/efi-header.S | 6 | ||||
-rw-r--r-- | arch/arm/boot/compressed/head.S | 58 |
2 files changed, 26 insertions, 38 deletions
diff --git a/arch/arm/boot/compressed/efi-header.S b/arch/arm/boot/compressed/efi-header.S index a5983588f96b..62286da318e7 100644 --- a/arch/arm/boot/compressed/efi-header.S +++ b/arch/arm/boot/compressed/efi-header.S @@ -60,7 +60,7 @@ optional_header: .long __pecoff_code_size @ SizeOfCode .long __pecoff_data_size @ SizeOfInitializedData .long 0 @ SizeOfUninitializedData - .long efi_stub_entry - start @ AddressOfEntryPoint + .long efi_entry - start @ AddressOfEntryPoint .long start_offset @ BaseOfCode .long __pecoff_data_start - start @ BaseOfData @@ -70,8 +70,8 @@ extra_header_fields: .long SZ_512 @ FileAlignment .short 0 @ MajorOsVersion .short 0 @ MinorOsVersion - .short 0 @ MajorImageVersion - .short 0 @ MinorImageVersion + .short LINUX_EFISTUB_MAJOR_VERSION @ MajorImageVersion + .short LINUX_EFISTUB_MINOR_VERSION @ MinorImageVersion .short 0 @ MajorSubsystemVersion .short 0 @ MinorSubsystemVersion .long 0 @ Win32VersionValue diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 088b0a060876..04f77214f050 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -1437,29 +1437,25 @@ __enter_kernel: reloc_code_end: #ifdef CONFIG_EFI_STUB - .align 2 -_start: .long start - . - -ENTRY(efi_stub_entry) - @ allocate space on stack for passing current zImage address - @ and for the EFI stub to return of new entry point of - @ zImage, as EFI stub may copy the kernel. Pointer address - @ is passed in r2. r0 and r1 are passed through from the - @ EFI firmware to efi_entry - adr ip, _start - ldr r3, [ip] - add r3, r3, ip - stmfd sp!, {r3, lr} - mov r2, sp @ pass zImage address in r2 - bl efi_entry - - @ Check for error return from EFI stub. r0 has FDT address - @ or error code. - cmn r0, #1 - beq efi_load_fail - - @ Preserve return value of efi_entry() in r4 - mov r4, r0 +ENTRY(efi_enter_kernel) + mov r7, r0 @ preserve image base + mov r4, r1 @ preserve DT pointer + + mov r0, r4 @ DT start + add r1, r4, r2 @ DT end + bl cache_clean_flush + + mov r0, r7 @ relocated zImage + ldr r1, =_edata @ size of zImage + add r1, r1, r0 @ end of zImage + bl cache_clean_flush + + @ The PE/COFF loader might not have cleaned the code we are + @ running beyond the PoU, and so calling cache_off below from + @ inside the PE/COFF loader allocated region is unsafe unless + @ we explicitly clean it to the PoC. + adr r0, call_cache_fn @ region of code we will + adr r1, 0f @ run with MMU off bl cache_clean_flush bl cache_off @@ -1469,18 +1465,10 @@ ENTRY(efi_stub_entry) mov r0, #0 mov r1, #0xFFFFFFFF mov r2, r4 - - @ Branch to (possibly) relocated zImage that is in [sp] - ldr lr, [sp] - ldr ip, =start_offset - add lr, lr, ip - mov pc, lr @ no mode switch - -efi_load_fail: - @ Return EFI_LOAD_ERROR to EFI firmware on error. - ldr r0, =0x80000001 - ldmfd sp!, {ip, pc} -ENDPROC(efi_stub_entry) + add r7, r7, #(__efi_start - start) + mov pc, r7 @ no mode switch +ENDPROC(efi_enter_kernel) +0: #endif .align |