diff options
| author | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-19 13:20:37 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2022-09-06 12:19:34 +0300 |
| commit | ead384d956345681e1ddf97890d5e15ded015f07 (patch) | |
| tree | aa03bbe0c8e154a3743f28b7eccb281912c20dec /arch/loongarch/kernel/head.S | |
| parent | 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 (diff) | |
| download | linux-ead384d956345681e1ddf97890d5e15ded015f07.tar.xz | |
efi/loongarch: Add efistub booting support
This patch adds efistub booting support, which is the standard UEFI boot
protocol for LoongArch to use.
We use generic efistub, which means we can pass boot information (i.e.,
system table, memory map, kernel command line, initrd) via a light FDT
and drop a lot of non-standard code.
We use a flat mapping to map the efi runtime in the kernel's address
space. In efi, VA = PA; in kernel, VA = PA + PAGE_OFFSET. As a result,
flat mapping is not identity mapping, SetVirtualAddressMap() is still
needed for the efi runtime.
Tested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
[ardb: change fpic to fpie as suggested by Xi Ruoyao]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/loongarch/kernel/head.S')
| -rw-r--r-- | arch/loongarch/kernel/head.S | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S index c60eb66793e3..01bac62a6442 100644 --- a/arch/loongarch/kernel/head.S +++ b/arch/loongarch/kernel/head.S @@ -12,6 +12,26 @@ #include <asm/loongarch.h> #include <asm/stackframe.h> +#ifdef CONFIG_EFI_STUB + +#include "efi-header.S" + + __HEAD + +_head: + .word MZ_MAGIC /* "MZ", MS-DOS header */ + .org 0x3c /* 0x04 ~ 0x3b reserved */ + .long pe_header - _head /* Offset to the PE header */ + +pe_header: + __EFI_PE_HEADER + +SYM_DATA(kernel_asize, .long _end - _text); +SYM_DATA(kernel_fsize, .long _edata - _text); +SYM_DATA(kernel_offset, .long kernel_offset - _text); + +#endif + __REF SYM_CODE_START(kernel_entry) # kernel entry point |