This patch adds zboot (self-extracting compressed kernel) support, all
existing in-kernel compressing algorithm and efistub are supported.
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/Kbuild | 2 +-
arch/loongarch/Kconfig | 11 ++
arch/loongarch/Makefile | 26 ++-
arch/loongarch/boot/Makefile | 55 ++++++
arch/loongarch/boot/boot.lds.S | 64 +++++++
arch/loongarch/boot/decompress.c | 98 +++++++++++
arch/loongarch/boot/string.c | 166 ++++++++++++++++++
arch/loongarch/boot/zheader.S | 100 +++++++++++
arch/loongarch/boot/zkernel.S | 99 +++++++++++
arch/loongarch/tools/Makefile | 15 ++
arch/loongarch/tools/calc_vmlinuz_load_addr.c | 51 ++++++
arch/loongarch/tools/elf-entry.c | 66 +++++++
12 files changed, 749 insertions(+), 4 deletions(-)
create mode 100644 arch/loongarch/boot/boot.lds.S
create mode 100644 arch/loongarch/boot/decompress.c
create mode 100644 arch/loongarch/boot/string.c
create mode 100644 arch/loongarch/boot/zheader.S
create mode 100644 arch/loongarch/boot/zkernel.S
create mode 100644 arch/loongarch/tools/Makefile
create mode 100644 arch/loongarch/tools/calc_vmlinuz_load_addr.c
create mode 100644 arch/loongarch/tools/elf-entry.c
diff --git a/arch/loongarch/Kbuild b/arch/loongarch/Kbuild
index ab5373d0a24f..d907fdd7ca08 100644
--- a/arch/loongarch/Kbuild
+++ b/arch/loongarch/Kbuild
@@ -3,4 +3,4 @@ obj-y += mm/
obj-y += vdso/
# for cleaning
-subdir- += boot
+subdir- += boot tools
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 55225ee5f868..6c1042746b2d 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -107,6 +107,7 @@ config LOONGARCH
select PERF_USE_VMALLOC
select RTC_LIB
select SPARSE_IRQ
+ select SYS_SUPPORTS_ZBOOT
select SYSCTL_EXCEPTION_TRACE
select SWIOTLB
select TRACE_IRQFLAGS_SUPPORT
@@ -143,6 +144,16 @@ config LOCKDEP_SUPPORT
bool
default y
+config SYS_SUPPORTS_ZBOOT
+ bool
+ select HAVE_KERNEL_GZIP
+ select HAVE_KERNEL_BZIP2
+ select HAVE_KERNEL_LZ4
+ select HAVE_KERNEL_LZMA
+ select HAVE_KERNEL_LZO
+ select HAVE_KERNEL_XZ
+ select HAVE_KERNEL_ZSTD
+
config MACH_LOONGSON32
def_bool 32BIT
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index d88a792dafbe..1ed5b8466565 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -5,12 +5,31 @@
boot := arch/loongarch/boot
+ifndef CONFIG_SYS_SUPPORTS_ZBOOT
+
ifndef CONFIG_EFI_STUB
KBUILD_IMAGE = $(boot)/vmlinux
else
KBUILD_IMAGE = $(boot)/vmlinux.efi
endif
+else
+
+ifndef CONFIG_EFI_STUB
+KBUILD_IMAGE = $(boot)/vmlinuz
+else
+KBUILD_IMAGE = $(boot)/vmlinuz.efi
+endif
+
+endif
+
+load-y = 0x9000000000200000
+bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
+
+archscripts: scripts_basic
+ $(Q)$(MAKE) $(build)=arch/loongarch/tools elf-entry
+ $(Q)$(MAKE) $(build)=arch/loongarch/tools calc_vmlinuz_load_addr
+
#
# Select the object file format to substitute into the linker script.
#
@@ -55,9 +74,6 @@ KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
cflags-y += -ffreestanding
cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
-load-y = 0x9000000000200000
-bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
-
drivers-$(CONFIG_PCI) += arch/loongarch/pci/
KBUILD_AFLAGS += $(cflags-y)
@@ -99,7 +115,11 @@ $(KBUILD_IMAGE): vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@
install:
+ifndef CONFIG_SYS_SUPPORTS_ZBOOT
$(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
+else
+ $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
+endif
$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
diff --git a/arch/loongarch/boot/Makefile b/arch/loongarch/boot/Makefile
index 66f2293c34b2..c26a36004ae2 100644
--- a/arch/loongarch/boot/Makefile
+++ b/arch/loongarch/boot/Makefile
@@ -21,3 +21,58 @@ quiet_cmd_eficopy = OBJCOPY $@
$(obj)/vmlinux.efi: $(obj)/vmlinux FORCE
$(call if_changed,eficopy)
+
+# zboot
+extra-y += boot.lds
+$(obj)/boot.lds: $(obj)/vmlinux.bin FORCE
+CPPFLAGS_boot.lds = $(KBUILD_CPPFLAGS) -DVMLINUZ_LOAD_ADDRESS=$(zload-y)
+
+entry-y = $(shell $(objtree)/arch/loongarch/tools/elf-entry $(obj)/vmlinux)
+zload-y = $(shell $(objtree)/arch/loongarch/tools/calc_vmlinuz_load_addr \
+ $(obj)/vmlinux.bin $(VMLINUX_LOAD_ADDRESS))
+
+BOOT_HEAP_SIZE := 0x400000
+BOOT_STACK_SIZE := 0x002000
+
+KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
+ -DBOOT_STACK_SIZE=$(BOOT_STACK_SIZE)
+
+KBUILD_CFLAGS := $(KBUILD_CFLAGS) -fpic -D__KERNEL__ \
+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
+ -DBOOT_STACK_SIZE=$(BOOT_STACK_SIZE)
+
+targets += vmlinux.bin
+OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary $(strip-flags)
+$(obj)/vmlinux.bin: $(obj)/vmlinux FORCE
+ $(call if_changed,objcopy)
+
+tool_$(CONFIG_KERNEL_GZIP) = gzip
+tool_$(CONFIG_KERNEL_BZIP2) = bzip2_with_size
+tool_$(CONFIG_KERNEL_LZ4) = lz4_with_size
+tool_$(CONFIG_KERNEL_LZMA) = lzma_with_size
+tool_$(CONFIG_KERNEL_LZO) = lzo_with_size
+tool_$(CONFIG_KERNEL_XZ) = xzkern_with_size
+tool_$(CONFIG_KERNEL_ZSTD) = zstd22_with_size
+
+targets += vmlinux.bin.z
+$(obj)/vmlinux.bin.z: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,$(tool_y))
+
+targets += $(notdir $(vmlinuzobjs-y))
+vmlinuzobjs-y := $(obj)/zkernel.o $(obj)/decompress.o $(obj)/string.o
+vmlinuzobjs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
+$(obj)/zkernel.o: $(obj)/vmlinux.bin.z
+AFLAGS_zkernel.o = $(KBUILD_AFLAGS) -DVMLINUZ_LOAD_ADDRESS=$(zload-y) -DKERNEL_ENTRY=$(entry-y)
+
+quiet_cmd_zld = LD $@
+ cmd_zld = $(LD) $(KBUILD_LDFLAGS) -T $< $(vmlinuzobjs-y) -o $@
+
+targets += vmlinuz
+$(obj)/vmlinuz: $(src)/boot.lds $(vmlinuzobjs-y) FORCE
+ $(call if_changed,zld)
+ $(call if_changed,strip)
+
+targets += vmlinuz.efi
+$(obj)/vmlinuz.efi: $(obj)/vmlinuz FORCE
+ $(call if_changed,eficopy)
diff --git a/arch/loongarch/boot/boot.lds.S b/arch/loongarch/boot/boot.lds.S
new file mode 100644
index 000000000000..23e698782afd
--- /dev/null
+++ b/arch/loongarch/boot/boot.lds.S
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ld.script for compressed kernel support of LoongArch
+ *
+ * Author: Huacai Chen <chenhuacai@xxxxxxxxxxx>
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#include "../kernel/image-vars.h"
+
+/*
+ * Max avaliable Page Size is 64K, so we set SectionAlignment
+ * field of EFI application to 64K.
+ */
+PECOFF_FILE_ALIGN = 0x200;
+PECOFF_SEGMENT_ALIGN = 0x10000;
+
+OUTPUT_ARCH(loongarch)
+ENTRY(kernel_entry)
+PHDRS {
+ text PT_LOAD FLAGS(7); /* RWX */
+}
+SECTIONS
+{
+ . = VMLINUZ_LOAD_ADDRESS;
+
+ _text = .;
+ .head.text : {
+ *(.head.text)
+ }
+
+ .text : {
+ *(.text)
+ *(.init.text)
+ *(.rodata)
+ }: text
+
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ _data = .;
+ .data : {
+ *(.data)
+ *(.init.data)
+ /* Put the compressed image here */
+ __image_begin = .;
+ *(.image)
+ __image_end = .;
+ CONSTRUCTORS
+ . = ALIGN(PECOFF_FILE_ALIGN);
+ }
+ _edata = .;
+
+ .bss : {
+ *(.bss)
+ *(.init.bss)
+ }
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ _end = .;
+
+ /DISCARD/ : {
+ *(.options)
+ *(.comment)
+ *(.note)
+ }
+}
diff --git a/arch/loongarch/boot/decompress.c b/arch/loongarch/boot/decompress.c
new file mode 100644
index 000000000000..8f55fcd8f285
--- /dev/null
+++ b/arch/loongarch/boot/decompress.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author: Huacai Chen <chenhuacai@xxxxxxxxxxx>
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/libfdt.h>
+
+#include <asm/addrspace.h>
+
+/*
+ * These two variables specify the free mem region
+ * that can be used for temporary malloc area
+ */
+unsigned long free_mem_ptr;
+unsigned long free_mem_end_ptr;
+
+/* The linker tells us where the image is. */
+extern unsigned char __image_begin, __image_end;
+
+#define puts(s) do {} while (0)
+#define puthex(val) do {} while (0)
+
+void error(char *x)
+{
+ puts("\n\n");
+ puts(x);
+ puts("\n\n -- System halted");
+
+ while (1)
+ ; /* Halt */
+}
+
+/* activate the code for pre-boot environment */
+#define STATIC static
+
+#include "../../../../lib/ashldi3.c"
+
+#ifdef CONFIG_KERNEL_GZIP
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZ4
+#include "../../../../lib/decompress_unlz4.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
+
+#ifdef CONFIG_KERNEL_XZ
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
+#ifdef CONFIG_KERNEL_ZSTD
+#include "../../../../lib/decompress_unzstd.c"
+#endif
+
+void decompress_kernel(unsigned long boot_heap_start)
+{
+ unsigned long zimage_start, zimage_size;
+
+ zimage_start = (unsigned long)(&__image_begin);
+ zimage_size = (unsigned long)(&__image_end) -
+ (unsigned long)(&__image_begin);
+
+ puts("zimage at: ");
+ puthex(zimage_start);
+ puts(" ");
+ puthex(zimage_size + zimage_start);
+ puts("\n");
+
+ /* This area are prepared for mallocing when decompressing */
+ free_mem_ptr = boot_heap_start;
+ free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
+
+ /* Display standard Linux/LoongArch boot prompt */
+ puts("Uncompressing Linux at load address ");
+ puthex(VMLINUX_LOAD_ADDRESS);
+ puts("\n");
+
+ /* Decompress the kernel with according algorithm */
+ __decompress((char *)zimage_start, zimage_size, 0, 0,
+ (void *)VMLINUX_LOAD_ADDRESS, 0, 0, error);
+
+ puts("Now, booting the kernel...\n");
+}
diff --git a/arch/loongarch/boot/string.c b/arch/loongarch/boot/string.c
new file mode 100644
index 000000000000..3f746e7c2bb5
--- /dev/null
+++ b/arch/loongarch/boot/string.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/loongarch/boot/string.c
+ *
+ * Very small subset of simple string routines
+ */
+
+#include <linux/types.h>
+
+void __weak *memset(void *s, int c, size_t n)
+{
+ int i;
+ char *ss = s;
+
+ for (i = 0; i < n; i++)
+ ss[i] = c;
+ return s;
+}
+
+void __weak *memcpy(void *dest, const void *src, size_t n)
+{
+ int i;
+ const char *s = src;
+ char *d = dest;
+
+ for (i = 0; i < n; i++)
+ d[i] = s[i];
+ return dest;
+}
+
+void __weak *memmove(void *dest, const void *src, size_t n)
+{
+ int i;
+ const char *s = src;
+ char *d = dest;
+
+ if (d < s) {
+ for (i = 0; i < n; i++)
+ d[i] = s[i];
+ } else if (d > s) {
+ for (i = n - 1; i >= 0; i--)
+ d[i] = s[i];
+ }
+
+ return dest;
+}
+
+int __weak memcmp(const void *cs, const void *ct, size_t count)
+{
+ int res = 0;
+ const unsigned char *su1, *su2;
+
+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) {
+ res = *su1 - *su2;
+ if (res != 0)
+ break;
+ }
+ return res;
+}
+
+int __weak strcmp(const char *str1, const char *str2)
+{
+ int delta = 0;
+ const unsigned char *s1 = (const unsigned char *)str1;
+ const unsigned char *s2 = (const unsigned char *)str2;
+
+ while (*s1 || *s2) {
+ delta = *s1 - *s2;
+ if (delta)
+ return delta;
+ s1++;
+ s2++;
+ }
+ return 0;
+}
+
+size_t __weak strlen(const char *s)
+{
+ const char *sc;
+
+ for (sc = s; *sc != '\0'; ++sc)
+ /* nothing */;
+ return sc - s;
+}
+
+size_t __weak strnlen(const char *s, size_t count)
+{
+ const char *sc;
+
+ for (sc = s; count-- && *sc != '\0'; ++sc)
+ /* nothing */;
+ return sc - s;
+}
+
+char * __weak strnstr(const char *s1, const char *s2, size_t len)
+{
+ size_t l2;
+
+ l2 = strlen(s2);
+ if (!l2)
+ return (char *)s1;
+ while (len >= l2) {
+ len--;
+ if (!memcmp(s1, s2, l2))
+ return (char *)s1;
+ s1++;
+ }
+ return NULL;
+}
+
+#undef strcat
+char * __weak strcat(char *dest, const char *src)
+{
+ char *tmp = dest;
+
+ while (*dest)
+ dest++;
+ while ((*dest++ = *src++) != '\0')
+ ;
+ return tmp;
+}
+
+char * __weak strncat(char *dest, const char *src, size_t count)
+{
+ char *tmp = dest;
+
+ if (count) {
+ while (*dest)
+ dest++;
+ while ((*dest++ = *src++) != 0) {
+ if (--count == 0) {
+ *dest = '\0';
+ break;
+ }
+ }
+ }
+ return tmp;
+}
+
+char * __weak strpbrk(const char *cs, const char *ct)
+{
+ const char *sc1, *sc2;
+
+ for (sc1 = cs; *sc1 != '\0'; ++sc1) {
+ for (sc2 = ct; *sc2 != '\0'; ++sc2) {
+ if (*sc1 == *sc2)
+ return (char *)sc1;
+ }
+ }
+ return NULL;
+}
+
+char * __weak strsep(char **s, const char *ct)
+{
+ char *sbegin = *s;
+ char *end;
+
+ if (sbegin == NULL)
+ return NULL;
+
+ end = strpbrk(sbegin, ct);
+ if (end)
+ *end++ = '\0';
+ *s = end;
+ return sbegin;
+}
diff --git a/arch/loongarch/boot/zheader.S b/arch/loongarch/boot/zheader.S
new file mode 100644
index 000000000000..4bc50d953ec7
--- /dev/null
+++ b/arch/loongarch/boot/zheader.S
@@ -0,0 +1,100 @@
+/* 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
+coff_header:
+ .short IMAGE_FILE_MACHINE_LOONGARCH /* Machine */
+ .short section_count /* NumberOfSections */
+ .long 0 /* TimeDateStamp */
+ .long 0 /* PointerToSymbolTable */
+ .long 0 /* NumberOfSymbols */
+ .short section_table - optional_header /* SizeOfOptionalHeader */
+ .short IMAGE_FILE_DEBUG_STRIPPED | \
+ IMAGE_FILE_EXECUTABLE_IMAGE | \
+ IMAGE_FILE_LINE_NUMS_STRIPPED /* Characteristics */
+
+optional_header:
+ .short PE_OPT_MAGIC_PE32PLUS /* PE32+ format */
+ .byte 0x02 /* MajorLinkerVersion */
+ .byte 0x14 /* MinorLinkerVersion */
+ .long _data - efi_header_end /* SizeOfCode */
+ .long _end - _data /* SizeOfInitializedData */
+ .long 0 /* SizeOfUninitializedData */
+ .long __efistub_efi_pe_entry - _head /* AddressOfEntryPoint */
+ .long efi_header_end - _head /* BaseOfCode */
+
+extra_header_fields:
+ .quad 0 /* ImageBase */
+ .long PECOFF_SEGMENT_ALIGN /* SectionAlignment */
+ .long PECOFF_FILE_ALIGN /* FileAlignment */
+ .short 0 /* MajorOperatingSystemVersion */
+ .short 0 /* MinorOperatingSystemVersion */
+ .short 0 /* MajorImageVersion */
+ .short 0 /* 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 efi_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 (section_table - .) / 8 /* NumberOfRvaAndSizes */
+
+ .quad 0 /* ExportTable */
+ .quad 0 /* ImportTable */
+ .quad 0 /* ResourceTable */
+ .quad 0 /* ExceptionTable */
+ .quad 0 /* CertificationTable */
+ .quad 0 /* BaseRelocationTable */
+
+ /* Section table */
+section_table:
+ .ascii ".text\0\0\0"
+ .long _data - efi_header_end /* VirtualSize */
+ .long efi_header_end - _head /* VirtualAddress */
+ .long _data - efi_header_end /* SizeOfRawData */
+ .long efi_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 - _data /* VirtualSize */
+ .long _data - _head /* VirtualAddress */
+ .long _edata - _data /* SizeOfRawData */
+ .long _data - _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 */
+
+ .org 0x20e
+ .word kernel_version - 512 - _head
+
+ .set section_count, (. - section_table) / 40
+efi_header_end:
+ .endm
diff --git a/arch/loongarch/boot/zkernel.S b/arch/loongarch/boot/zkernel.S
new file mode 100644
index 000000000000..13a8a14a2328
--- /dev/null
+++ b/arch/loongarch/boot/zkernel.S
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include <asm/loongarch.h>
+#include <asm/regdef.h>
+#include <generated/compile.h>
+#include <generated/utsrelease.h>
+
+#ifdef CONFIG_EFI_STUB
+
+#include "zheader.S"
+
+ __HEAD
+
+_head:
+ /* "MZ", MS-DOS header */
+ .word MZ_MAGIC
+ .org 0x28
+ .ascii "Loongson\0"
+ .org 0x3c
+ /* Offset to the PE header */
+ .long pe_header - _head
+
+pe_header:
+ __EFI_PE_HEADER
+
+kernel_asize:
+ .long _end - _text
+
+kernel_fsize:
+ .long _edata - _text
+
+kernel_vaddr:
+ .quad VMLINUZ_LOAD_ADDRESS
+
+kernel_offset:
+ .long kernel_offset - _text
+
+kernel_version:
+ .ascii UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ") " UTS_VERSION "\0"
+
+SYM_L_GLOBAL(kernel_asize)
+SYM_L_GLOBAL(kernel_fsize)
+SYM_L_GLOBAL(kernel_vaddr)
+SYM_L_GLOBAL(kernel_offset)
+
+#endif
+
+ __INIT
+
+SYM_CODE_START(kernel_entry)
+ /* Save boot rom start args */
+ move s0, a0
+ move s1, a1
+ move s2, a2
+ move s3, a3
+
+ /* Config Direct Mapping */
+ li.d t0, CSR_DMW0_INIT
+ csrwr t0, LOONGARCH_CSR_DMWIN0
+ li.d t0, CSR_DMW1_INIT
+ csrwr t0, LOONGARCH_CSR_DMWIN1
+
+ /* Clear BSS */
+ la.abs a0, _edata
+ la.abs a2, _end
+1: st.d zero, a0, 0
+ addi.d a0, a0, 8
+ bne a2, a0, 1b
+
+ la.abs a0, .heap /* heap address */
+ la.abs sp, .stack + 8192 /* stack address */
+
+ la ra, 2f
+ la t4, decompress_kernel
+ jirl zero, t4, 0
+2:
+ move a0, s0
+ move a1, s1
+ move a2, s2
+ move a3, s3
+ PTR_LI t4, KERNEL_ENTRY
+ jirl zero, t4, 0
+3:
+ b 3b
+SYM_CODE_END(kernel_entry)
+
+ .comm .heap, BOOT_HEAP_SIZE, 4
+ .comm .stack, BOOT_STACK_SIZE, 4
+
+ .align 4
+ .section .image, "a", %progbits
+ .incbin "arch/loongarch/boot/vmlinux.bin.z"
diff --git a/arch/loongarch/tools/Makefile b/arch/loongarch/tools/Makefile
new file mode 100644
index 000000000000..8a6181c82a91
--- /dev/null
+++ b/arch/loongarch/tools/Makefile
@@ -0,0 +1,15 @@
+#
+# arch/loongarch/boot/Makefile
+#
+# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+#
+
+hostprogs := elf-entry
+PHONY += elf-entry
+elf-entry: $(obj)/elf-entry
+ @:
+
+hostprogs += calc_vmlinuz_load_addr
+PHONY += calc_vmlinuz_load_addr
+calc_vmlinuz_load_addr: $(obj)/calc_vmlinuz_load_addr
+ @:
diff --git a/arch/loongarch/tools/calc_vmlinuz_load_addr.c b/arch/loongarch/tools/calc_vmlinuz_load_addr.c
new file mode 100644
index 000000000000..5e2ca6b4dff6
--- /dev/null
+++ b/arch/loongarch/tools/calc_vmlinuz_load_addr.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+int main(int argc, char *argv[])
+{
+ unsigned long long vmlinux_size, vmlinux_load_addr, vmlinuz_load_addr;
+ struct stat sb;
+
+ if (argc != 3) {
+ fprintf(stderr, "Usage: %s <pathname> <vmlinux_load_addr>\n", argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ if (stat(argv[1], &sb) == -1) {
+ perror("stat");
+ return EXIT_FAILURE;
+ }
+
+ /* Convert hex characters to dec number */
+ errno = 0;
+ if (sscanf(argv[2], "%llx", &vmlinux_load_addr) != 1) {
+ if (errno != 0)
+ perror("sscanf");
+ else
+ fprintf(stderr, "No matching characters\n");
+
+ return EXIT_FAILURE;
+ }
+
+ vmlinux_size = (uint64_t)sb.st_size;
+ vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;
+
+ /*
+ * Align with 64KB: KEXEC needs load sections to be aligned to PAGE_SIZE,
+ * which may be as large as 64KB depending on the kernel configuration.
+ */
+
+ vmlinuz_load_addr += (0x10000 - vmlinux_size % 0x10000);
+
+ printf("0x%llx\n", vmlinuz_load_addr);
+
+ return EXIT_SUCCESS;
+}
diff --git a/arch/loongarch/tools/elf-entry.c b/arch/loongarch/tools/elf-entry.c
new file mode 100644
index 000000000000..c80721e0dee1
--- /dev/null
+++ b/arch/loongarch/tools/elf-entry.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <elf.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((noreturn))
+static void die(const char *msg)
+{
+ fputs(msg, stderr);
+ exit(EXIT_FAILURE);
+}
+
+int main(int argc, const char *argv[])
+{
+ uint64_t entry;
+ size_t nread;
+ FILE *file;
+ union {
+ Elf32_Ehdr ehdr32;
+ Elf64_Ehdr ehdr64;
+ } hdr;
+
+ if (argc != 2)
+ die("Usage: elf-entry <elf-file>\n");
+
+ file = fopen(argv[1], "r");
+ if (!file) {
+ perror("Unable to open input file");
+ return EXIT_FAILURE;
+ }
+
+ nread = fread(&hdr, 1, sizeof(hdr), file);
+ if (nread != sizeof(hdr)) {
+ fclose(file);
+ perror("Unable to read input file");
+ return EXIT_FAILURE;
+ }
+
+ if (memcmp(hdr.ehdr32.e_ident, ELFMAG, SELFMAG)) {
+ fclose(file);
+ die("Input is not an ELF\n");
+ }
+
+ switch (hdr.ehdr32.e_ident[EI_CLASS]) {
+ case ELFCLASS32:
+ /* Sign extend to form a canonical address */
+ entry = (int64_t)(int32_t)hdr.ehdr32.e_entry;
+ break;
+
+ case ELFCLASS64:
+ entry = hdr.ehdr64.e_entry;
+ break;
+
+ default:
+ fclose(file);
+ die("Invalid ELF class\n");
+ }
+
+ fclose(file);
+ printf("0x%016" PRIx64 "\n", entry);
+
+ return EXIT_SUCCESS;
+}
--
2.27.0
