On Fri, 5 Aug 2022 at 15:45, Huacai Chen <chenhuacai@xxxxxxxxxx> wrote: > > Hi, Ard, > > Friendly ping: is there anything remaining for this patch to get > mainlined in this cycle? > Hello, I'll look at it again asap. We should be able to sort this out for v6.1 -- Ard. > > On Fri, Jun 17, 2022 at 10:56 PM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote: > > > > This patch adds efistub booting support, which is the standard UEFI boot > > protocol for us 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. > > > > Currently, generic efistub doesn't support mapping efi runtime in the > > kernel. So we set efi_novamap to not call SetVirtualAddressMap() in the > > stub. Instead, we call it in the core kernel. This also makes the raw > > elf kernel booting be possible, which is needed by non-UEFI firmware > > (e.g., PMON which is widely used by Loongson for historic reasons). > > > > Then how the elf kernel and the efi kernel co-exist? When building, the > > raw vmlinux is naturally in elf format, the efi kernel is generated from > > vmlinux by objcopy via removing the elf header. > > > > Note: The magic number in MSDOS header is used by Grub [1], which is the > > same as RISC-V and ARM64. > > > > [1] https://lists.gnu.org/archive/html/grub-devel/2021-10/msg00215.html > > > > Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx> > > --- > > arch/loongarch/Kconfig | 9 ++ > > arch/loongarch/Makefile | 5 + > > arch/loongarch/boot/Makefile | 4 + > > arch/loongarch/kernel/efi-header.S | 101 ++++++++++++++ > > arch/loongarch/kernel/efi.c | 126 +++++++++++++++++- > > arch/loongarch/kernel/head.S | 26 ++++ > > arch/loongarch/kernel/image-vars.h | 29 ++++ > > arch/loongarch/kernel/vmlinux.lds.S | 1 + > > drivers/firmware/efi/Kconfig | 2 +- > > drivers/firmware/efi/libstub/Makefile | 10 ++ > > .../firmware/efi/libstub/efi-stub-helper.c | 2 +- > > drivers/firmware/efi/libstub/efi-stub.c | 4 +- > > drivers/firmware/efi/libstub/loongarch-stub.c | 88 ++++++++++++ > > include/linux/efi.h | 1 + > > include/linux/pe.h | 2 + > > 15 files changed, 405 insertions(+), 5 deletions(-) > > create mode 100644 arch/loongarch/kernel/efi-header.S > > create mode 100644 arch/loongarch/kernel/image-vars.h > > create mode 100644 drivers/firmware/efi/libstub/loongarch-stub.c > > > > diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig > > index 1ec220df751d..faee7fa4c004 100644 > > --- a/arch/loongarch/Kconfig > > +++ b/arch/loongarch/Kconfig > > @@ -305,6 +305,15 @@ config EFI > > This enables the kernel to use EFI runtime services that are > > available (such as the EFI variable services). > > > > +config EFI_STUB > > + bool "EFI boot stub support" > > + default y > > + depends on EFI > > + select EFI_GENERIC_STUB > > + help > > + This kernel feature allows the kernel to be loaded directly by > > + EFI firmware without the use of a bootloader. > > + > > config SMP > > bool "Multi-Processing support" > > help > > diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile > > index fbe4277e6404..c1bda54893ec 100644 > > --- a/arch/loongarch/Makefile > > +++ b/arch/loongarch/Makefile > > @@ -7,7 +7,11 @@ boot := arch/loongarch/boot > > > > KBUILD_DEFCONFIG := loongson3_defconfig > > > > +ifndef CONFIG_EFI_STUB > > KBUILD_IMAGE = $(boot)/vmlinux > > +else > > +KBUILD_IMAGE = $(boot)/vmlinux.efi > > +endif > > > > # > > # Select the object file format to substitute into the linker script. > > @@ -73,6 +77,7 @@ endif > > head-y := arch/loongarch/kernel/head.o > > > > libs-y += arch/loongarch/lib/ > > +libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a > > > > ifeq ($(KBUILD_EXTMOD),) > > prepare: vdso_prepare > > diff --git a/arch/loongarch/boot/Makefile b/arch/loongarch/boot/Makefile > > index 0125b17edc98..b39d50a7a3df 100644 > > --- a/arch/loongarch/boot/Makefile > > +++ b/arch/loongarch/boot/Makefile > > @@ -14,3 +14,7 @@ quiet_cmd_strip = STRIP $@ > > > > $(obj)/vmlinux: vmlinux FORCE > > $(call if_changed,strip) > > + > > +targets += vmlinux.efi > > +$(obj)/vmlinux.efi: $(obj)/vmlinux FORCE > > + $(call if_changed,objcopy) > > diff --git a/arch/loongarch/kernel/efi-header.S b/arch/loongarch/kernel/efi-header.S > > new file mode 100644 > > index 000000000000..ef48dc72455b > > --- /dev/null > > +++ b/arch/loongarch/kernel/efi-header.S > > @@ -0,0 +1,101 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#include <linux/pe.h> > > +#include <linux/sizes.h> > > + > > + .macro __EFI_PE_HEADER > > + .long PE_MAGIC > > +.Lcoff_header: > > +#ifdef CONFIG_32BIT > > + .short IMAGE_FILE_MACHINE_LOONGARCH32 /* Machine */ > > +#else > > + .short IMAGE_FILE_MACHINE_LOONGARCH64 /* Machine */ > > +#endif > > + .short .Lsection_count /* NumberOfSections */ > > + .long 0 /* TimeDateStamp */ > > + .long 0 /* PointerToSymbolTable */ > > + .long 0 /* NumberOfSymbols */ > > + .short .Lsection_table - .Loptional_header /* SizeOfOptionalHeader */ > > + .short IMAGE_FILE_DEBUG_STRIPPED | \ > > + IMAGE_FILE_EXECUTABLE_IMAGE | \ > > + IMAGE_FILE_LINE_NUMS_STRIPPED /* Characteristics */ > > + > > +.Loptional_header: > > + .short PE_OPT_MAGIC_PE32PLUS /* PE32+ format */ > > + .byte 0x02 /* MajorLinkerVersion */ > > + .byte 0x14 /* MinorLinkerVersion */ > > + .long __inittext_end - .Lefi_header_end /* SizeOfCode */ > > + .long _end - __initdata_begin /* SizeOfInitializedData */ > > + .long 0 /* SizeOfUninitializedData */ > > + .long __efistub_efi_pe_entry - _head /* AddressOfEntryPoint */ > > + .long .Lefi_header_end - _head /* BaseOfCode */ > > + > > +.Lextra_header_fields: > > + .quad 0 /* ImageBase */ > > + .long PECOFF_SEGMENT_ALIGN /* SectionAlignment */ > > + .long PECOFF_FILE_ALIGN /* FileAlignment */ > > + .short 0 /* MajorOperatingSystemVersion */ > > + .short 0 /* MinorOperatingSystemVersion */ > > + .short LINUX_EFISTUB_MAJOR_VERSION /* MajorImageVersion */ > > + .short LINUX_EFISTUB_MINOR_VERSION /* MinorImageVersion */ > > + .short 0 /* MajorSubsystemVersion */ > > + .short 0 /* MinorSubsystemVersion */ > > + .long 0 /* Win32VersionValue */ > > + > > + .long _end - _head /* SizeOfImage */ > > + > > + /* Everything before the kernel image is considered part of the header */ > > + .long .Lefi_header_end - _head /* SizeOfHeaders */ > > + .long 0 /* CheckSum */ > > + .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */ > > + .short 0 /* DllCharacteristics */ > > + .quad 0 /* SizeOfStackReserve */ > > + .quad 0 /* SizeOfStackCommit */ > > + .quad 0 /* SizeOfHeapReserve */ > > + .quad 0 /* SizeOfHeapCommit */ > > + .long 0 /* LoaderFlags */ > > + .long (.Lsection_table - .) / 8 /* NumberOfRvaAndSizes */ > > + > > + .quad 0 /* ExportTable */ > > + .quad 0 /* ImportTable */ > > + .quad 0 /* ResourceTable */ > > + .quad 0 /* ExceptionTable */ > > + .quad 0 /* CertificationTable */ > > + .quad 0 /* BaseRelocationTable */ > > + > > + /* Section table */ > > +.Lsection_table: > > + .ascii ".text\0\0\0" > > + .long __inittext_end - .Lefi_header_end /* VirtualSize */ > > + .long .Lefi_header_end - _head /* VirtualAddress */ > > + .long __inittext_end - .Lefi_header_end /* SizeOfRawData */ > > + .long .Lefi_header_end - _head /* PointerToRawData */ > > + > > + .long 0 /* PointerToRelocations */ > > + .long 0 /* PointerToLineNumbers */ > > + .short 0 /* NumberOfRelocations */ > > + .short 0 /* NumberOfLineNumbers */ > > + .long IMAGE_SCN_CNT_CODE | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_EXECUTE /* Characteristics */ > > + > > + .ascii ".data\0\0\0" > > + .long _end - __initdata_begin /* VirtualSize */ > > + .long __initdata_begin - _head /* VirtualAddress */ > > + .long _edata - __initdata_begin /* SizeOfRawData */ > > + .long __initdata_begin - _head /* PointerToRawData */ > > + > > + .long 0 /* PointerToRelocations */ > > + .long 0 /* PointerToLineNumbers */ > > + .short 0 /* NumberOfRelocations */ > > + .short 0 /* NumberOfLineNumbers */ > > + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_WRITE /* Characteristics */ > > + > > + .set .Lsection_count, (. - .Lsection_table) / 40 > > +.Lefi_header_end: > > + .endm > > diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c > > index a50b60c587fa..42f7cfe9ab03 100644 > > --- a/arch/loongarch/kernel/efi.c > > +++ b/arch/loongarch/kernel/efi.c > > @@ -22,19 +22,141 @@ > > > > #include <asm/early_ioremap.h> > > #include <asm/efi.h> > > +#include <asm/tlb.h> > > #include <asm/loongson.h> > > > > static unsigned long efi_nr_tables; > > static unsigned long efi_config_table; > > +static unsigned long screen_info_table __initdata = EFI_INVALID_TABLE_ADDR; > > > > static efi_system_table_t *efi_systab; > > -static efi_config_table_type_t arch_tables[] __initdata = {{},}; > > +static efi_config_table_type_t arch_tables[] __initdata = { > > + {LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID, &screen_info_table, "SINFO"}, > > + {}, > > +}; > > + > > +static void __init init_screen_info(void) > > +{ > > + struct screen_info *si; > > + > > + if (screen_info_table == EFI_INVALID_TABLE_ADDR) > > + return; > > + > > + si = early_memremap_ro(screen_info_table, sizeof(*si)); > > + if (!si) { > > + pr_err("Could not map screen_info config table\n"); > > + return; > > + } > > + screen_info = *si; > > + early_memunmap(si, sizeof(*si)); > > + > > + if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) > > + memblock_reserve(screen_info.lfb_base, screen_info.lfb_size); > > +} > > + > > +static void __init create_tlb(u32 index, u64 vppn, u32 ps, u32 mat) > > +{ > > + unsigned long tlblo0, tlblo1; > > + > > + write_csr_pagesize(ps); > > + > > + tlblo0 = vppn | CSR_TLBLO0_V | CSR_TLBLO0_WE | > > + CSR_TLBLO0_GLOBAL | (mat << CSR_TLBLO0_CCA_SHIFT); > > + tlblo1 = tlblo0 + (1 << ps); > > + > > + csr_write64(vppn, LOONGARCH_CSR_TLBEHI); > > + csr_write64(tlblo0, LOONGARCH_CSR_TLBELO0); > > + csr_write64(tlblo1, LOONGARCH_CSR_TLBELO1); > > + csr_xchg32(0, CSR_TLBIDX_EHINV, LOONGARCH_CSR_TLBIDX); > > + csr_xchg32(index, CSR_TLBIDX_IDX, LOONGARCH_CSR_TLBIDX); > > + > > + tlb_write_indexed(); > > +} > > + > > +#define MTLB_ENTRY_INDEX 0x800 > > + > > +/* Create VA == PA mapping as UEFI */ > > +static void __init fix_efi_mapping(void) > > +{ > > + unsigned int index = MTLB_ENTRY_INDEX; > > + unsigned int tlbnr = boot_cpu_data.tlbsizemtlb - 2; > > + unsigned long i, vppn; > > + > > + /* Low Memory, Cached */ > > + create_tlb(index++, 0x00000000, PS_128M, 1); > > + /* MMIO Registers, Uncached */ > > + create_tlb(index++, 0x10000000, PS_128M, 0); > > + > > + /* High Memory, Cached */ > > + for (i = 0; i < tlbnr; i++) { > > + vppn = 0x80000000ULL + (i * SZ_2G); > > + create_tlb(index++, vppn, PS_1G, 1); > > + } > > +} > > + > > +/* > > + * set_virtual_map() - create a virtual mapping for the EFI memory map and call > > + * efi_set_virtual_address_map enter virtual for runtime service > > + * > > + * This function populates the virt_addr fields of all memory region descriptors > > + * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors > > + * are also copied to @runtime_map, and their total count is returned in @count. > > + */ > > +static int __init set_virtual_map(void) > > +{ > > + int count = 0; > > + unsigned int size; > > + unsigned long attr; > > + efi_status_t status; > > + efi_runtime_services_t *rt; > > + efi_set_virtual_address_map_t *svam; > > + efi_memory_desc_t *in, runtime_map[32]; > > + > > + size = sizeof(efi_memory_desc_t); > > + > > + for_each_efi_memory_desc(in) { > > + attr = in->attribute; > > + if (!(attr & EFI_MEMORY_RUNTIME)) > > + continue; > > + > > + if (attr & (EFI_MEMORY_WB | EFI_MEMORY_WT)) > > + in->virt_addr = TO_CACHE(in->phys_addr); > > + else > > + in->virt_addr = TO_UNCACHE(in->phys_addr); > > + > > + memcpy(&runtime_map[count++], in, size); > > + } > > + > > + rt = early_memremap_ro((unsigned long)efi_systab->runtime, sizeof(*rt)); > > + > > + /* Install the new virtual address map */ > > + svam = rt->set_virtual_address_map; > > + > > + fix_efi_mapping(); > > + > > + status = svam(size * count, size, efi.memmap.desc_version, > > + (efi_memory_desc_t *)TO_PHYS((unsigned long)runtime_map)); > > + > > + local_flush_tlb_all(); > > + write_csr_pagesize(PS_DEFAULT_SIZE); > > + > > + return 0; > > +} > > > > void __init efi_runtime_init(void) > > { > > + int status; > > + > > if (!efi_enabled(EFI_BOOT)) > > return; > > > > + if (!efi_systab->runtime) > > + return; > > + > > + status = set_virtual_map(); > > + if (status < 0) > > + return; > > + > > if (efi_runtime_disabled()) { > > pr_info("EFI runtime services will be disabled.\n"); > > return; > > @@ -69,4 +191,6 @@ void __init efi_init(void) > > config_tables = early_memremap(efi_config_table, efi_nr_tables * size); > > efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables); > > early_memunmap(config_tables, efi_nr_tables * size); > > + > > + init_screen_info(); > > } > > diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S > > index e596dfcd924b..ccc425027553 100644 > > --- a/arch/loongarch/kernel/head.S > > +++ b/arch/loongarch/kernel/head.S > > @@ -12,6 +12,32 @@ > > #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 0x38 > > +#ifdef CONFIG_32BIT > > + .ascii "LA32" /* Magic number for BootLoader */ > > +#else > > + .ascii "LA64" /* Magic number for BootLoader */ > > +#endif > > + .org 0x3c > > + .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_ENTRY(_stext, SYM_L_GLOBAL, SYM_A_NONE) > > diff --git a/arch/loongarch/kernel/image-vars.h b/arch/loongarch/kernel/image-vars.h > > new file mode 100644 > > index 000000000000..104e9f0e97fe > > --- /dev/null > > +++ b/arch/loongarch/kernel/image-vars.h > > @@ -0,0 +1,29 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#ifndef __LOONGARCH_KERNEL_IMAGE_VARS_H > > +#define __LOONGARCH_KERNEL_IMAGE_VARS_H > > + > > +#ifdef CONFIG_EFI_STUB > > + > > +__efistub_memcmp = memcmp; > > +__efistub_memchr = memchr; > > +__efistub_memcpy = memcpy; > > +__efistub_memmove = memmove; > > +__efistub_memset = memset; > > +__efistub_strcat = strcat; > > +__efistub_strcmp = strcmp; > > +__efistub_strlen = strlen; > > +__efistub_strncat = strncat; > > +__efistub_strnstr = strnstr; > > +__efistub_strnlen = strnlen; > > +__efistub_strrchr = strrchr; > > +__efistub_kernel_entry = kernel_entry; > > +__efistub_kernel_asize = kernel_asize; > > +__efistub_kernel_fsize = kernel_fsize; > > +__efistub_kernel_offset = kernel_offset; > > + > > +#endif > > + > > +#endif /* __LOONGARCH_KERNEL_IMAGE_VARS_H */ > > diff --git a/arch/loongarch/kernel/vmlinux.lds.S b/arch/loongarch/kernel/vmlinux.lds.S > > index 78311a6101a3..9dfa5b886c09 100644 > > --- a/arch/loongarch/kernel/vmlinux.lds.S > > +++ b/arch/loongarch/kernel/vmlinux.lds.S > > @@ -12,6 +12,7 @@ > > #define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir) > > > > #include <asm-generic/vmlinux.lds.h> > > +#include "image-vars.h" > > > > /* > > * Max avaliable Page Size is 64K, so we set SectionAlignment > > diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig > > index 7aa4717cdcac..9e4645e5a5c0 100644 > > --- a/drivers/firmware/efi/Kconfig > > +++ b/drivers/firmware/efi/Kconfig > > @@ -118,7 +118,7 @@ config EFI_GENERIC_STUB > > > > config EFI_ARMSTUB_DTB_LOADER > > bool "Enable the DTB loader" > > - depends on EFI_GENERIC_STUB && !RISCV > > + depends on EFI_GENERIC_STUB && !RISCV && !LOONGARCH > > default y > > help > > Select this config option to add support for the dtb= command > > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile > > index d0537573501e..1588c61939e7 100644 > > --- a/drivers/firmware/efi/libstub/Makefile > > +++ b/drivers/firmware/efi/libstub/Makefile > > @@ -26,6 +26,8 @@ cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > $(call cc-option,-mno-single-pic-base) > > cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > -fpic > > +cflags-$(CONFIG_LOONGARCH) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > + -fpic > > > > cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt > > > > @@ -70,6 +72,8 @@ lib-$(CONFIG_ARM) += arm32-stub.o > > lib-$(CONFIG_ARM64) += arm64-stub.o > > lib-$(CONFIG_X86) += x86-stub.o > > lib-$(CONFIG_RISCV) += riscv-stub.o > > +lib-$(CONFIG_LOONGARCH) += loongarch-stub.o > > + > > CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) > > > > # Even when -mbranch-protection=none is set, Clang will generate a > > @@ -125,6 +129,12 @@ STUBCOPY_FLAGS-$(CONFIG_RISCV) += --prefix-alloc-sections=.init \ > > --prefix-symbols=__efistub_ > > STUBCOPY_RELOC-$(CONFIG_RISCV) := R_RISCV_HI20 > > > > +# For LoongArch, keep all the symbols in .init section and make sure that no > > +# absolute symbols references doesn't exist. > > +STUBCOPY_FLAGS-$(CONFIG_LOONGARCH) += --prefix-alloc-sections=.init \ > > + --prefix-symbols=__efistub_ > > +STUBCOPY_RELOC-$(CONFIG_LOONGARCH) := R_LARCH_MARK_LA > > + > > $(obj)/%.stub.o: $(obj)/%.o FORCE > > $(call if_changed,stubcopy) > > > > diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c > > index 3d972061c1b0..f612cfceda22 100644 > > --- a/drivers/firmware/efi/libstub/efi-stub-helper.c > > +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c > > @@ -21,7 +21,7 @@ > > bool efi_nochunk; > > bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE); > > int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT; > > -bool efi_novamap; > > +bool efi_novamap = IS_ENABLED(CONFIG_LOONGARCH); /* LoongArch call svam() in kernel */ > > > > static bool efi_noinitrd; > > static bool efi_nosoftreserve; > > diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c > > index f515394cce6e..730b7bd21776 100644 > > --- a/drivers/firmware/efi/libstub/efi-stub.c > > +++ b/drivers/firmware/efi/libstub/efi-stub.c > > @@ -40,9 +40,9 @@ > > > > #ifdef CONFIG_ARM64 > > # define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64 > > -#elif defined(CONFIG_RISCV) > > +#elif defined(CONFIG_RISCV) || defined(CONFIG_LOONGARCH) > > # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE_MIN > > -#else > > +#else /* Only if TASK_SIZE is a constant */ > > # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE > > #endif > > > > diff --git a/drivers/firmware/efi/libstub/loongarch-stub.c b/drivers/firmware/efi/libstub/loongarch-stub.c > > new file mode 100644 > > index 000000000000..beee086d9950 > > --- /dev/null > > +++ b/drivers/firmware/efi/libstub/loongarch-stub.c > > @@ -0,0 +1,88 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Author: Yun Liu <liuyun@xxxxxxxxxxx> > > + * Huacai Chen <chenhuacai@xxxxxxxxxxx> > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#include <linux/efi.h> > > +#include <asm/efi.h> > > +#include <asm/addrspace.h> > > +#include "efistub.h" > > + > > +typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long fdt); > > + > > +extern int kernel_asize; > > +extern int kernel_fsize; > > +extern int kernel_offset; > > +extern kernel_entry_t kernel_entry; > > + > > +static efi_guid_t screen_info_guid = LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID; > > + > > +struct screen_info *alloc_screen_info(void) > > +{ > > + efi_status_t status; > > + struct screen_info *si; > > + > > + status = efi_bs_call(allocate_pool, > > + EFI_RUNTIME_SERVICES_DATA, sizeof(*si), (void **)&si); > > + if (status != EFI_SUCCESS) > > + return NULL; > > + > > + status = efi_bs_call(install_configuration_table, &screen_info_guid, si); > > + if (status == EFI_SUCCESS) > > + return si; > > + > > + efi_bs_call(free_pool, si); > > + > > + return NULL; > > +} > > + > > +void free_screen_info(struct screen_info *si) > > +{ > > + if (!si) > > + return; > > + > > + efi_bs_call(install_configuration_table, &screen_info_guid, NULL); > > + efi_bs_call(free_pool, si); > > +} > > + > > +efi_status_t check_platform_features(void) > > +{ > > + /* Config Direct Mapping */ > > + csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0); > > + csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1); > > + > > + return EFI_SUCCESS; > > +} > > + > > +efi_status_t handle_kernel_image(unsigned long *image_addr, > > + unsigned long *image_size, > > + unsigned long *reserve_addr, > > + unsigned long *reserve_size, > > + efi_loaded_image_t *image, > > + efi_handle_t image_handle) > > +{ > > + efi_status_t status; > > + unsigned long kernel_addr = 0; > > + > > + kernel_addr = (unsigned long)&kernel_offset - kernel_offset; > > + > > + status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize, > > + PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0); > > + > > + *image_addr = kernel_addr; > > + *image_size = kernel_asize; > > + > > + return status; > > +} > > + > > +void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt, unsigned long fdt_size) > > +{ > > + kernel_entry_t real_kernel_entry; > > + > > + real_kernel_entry = (kernel_entry_t) > > + ((unsigned long)&kernel_entry - entrypoint + VMLINUX_LOAD_ADDRESS); > > + > > + real_kernel_entry(true, fdt); > > +} > > diff --git a/include/linux/efi.h b/include/linux/efi.h > > index 7d9b0bb47eb3..adc43641ef8c 100644 > > --- a/include/linux/efi.h > > +++ b/include/linux/efi.h > > @@ -401,6 +401,7 @@ void efi_native_runtime_setup(void); > > * associated with ConOut > > */ > > #define LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, 0xb9, 0x0e, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95) > > +#define LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID EFI_GUID(0x07fd51a6, 0x9532, 0x926f, 0x51, 0xdc, 0x6a, 0x63, 0x60, 0x2f, 0x84, 0xb4) > > #define LINUX_EFI_ARM_CPU_STATE_TABLE_GUID EFI_GUID(0xef79e4aa, 0x3c3d, 0x4989, 0xb9, 0x02, 0x07, 0xa9, 0x43, 0xe5, 0x50, 0xd2) > > #define LINUX_EFI_LOADER_ENTRY_GUID EFI_GUID(0x4a67b082, 0x0a4c, 0x41cf, 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f) > > #define LINUX_EFI_RANDOM_SEED_TABLE_GUID EFI_GUID(0x1ce1e5bc, 0x7ceb, 0x42f2, 0x81, 0xe5, 0x8a, 0xad, 0xf1, 0x80, 0xf5, 0x7b) > > diff --git a/include/linux/pe.h b/include/linux/pe.h > > index daf09ffffe38..1d3836ef9d92 100644 > > --- a/include/linux/pe.h > > +++ b/include/linux/pe.h > > @@ -65,6 +65,8 @@ > > #define IMAGE_FILE_MACHINE_SH5 0x01a8 > > #define IMAGE_FILE_MACHINE_THUMB 0x01c2 > > #define IMAGE_FILE_MACHINE_WCEMIPSV2 0x0169 > > +#define IMAGE_FILE_MACHINE_LOONGARCH32 0x6232 > > +#define IMAGE_FILE_MACHINE_LOONGARCH64 0x6264 > > > > /* flags */ > > #define IMAGE_FILE_RELOCS_STRIPPED 0x0001 > > -- > > 2.27.0 > >
