[PATCH] LoongArch: Add efistub booting support

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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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