Re: [PATCH] LoongArch: Add efistub booting support

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Hi, Ard,

Friendly ping: is there anything remaining for this patch to get
mainlined in this cycle?

Huacai



Huacai

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
>



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