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| 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/setup.c | |
| 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/setup.c')
| -rw-r--r-- | arch/loongarch/kernel/setup.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index 8f5c2f9a1a83..e8714b1d94c8 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -49,9 +49,7 @@ #define SMBIOS_CORE_PACKAGE_OFFSET 0x23 #define LOONGSON_EFI_ENABLE (1 << 3) -#ifdef CONFIG_VT -struct screen_info screen_info; -#endif +struct screen_info screen_info __section(".data"); unsigned long fw_arg0, fw_arg1; DEFINE_PER_CPU(unsigned long, kernelsp); @@ -122,16 +120,9 @@ static void __init parse_cpu_table(const struct dmi_header *dm) static void __init parse_bios_table(const struct dmi_header *dm) { - int bios_extern; char *dmi_data = (char *)dm; - bios_extern = *(dmi_data + SMBIOS_BIOSEXTERN_OFFSET); b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6; - - if (bios_extern & LOONGSON_EFI_ENABLE) - set_bit(EFI_BOOT, &efi.flags); - else - clear_bit(EFI_BOOT, &efi.flags); } static void __init find_tokens(const struct dmi_header *dm, void *dummy) |