experimental support for loongson mips64el uefi

BUSYBOX/build.txt

@@ -13,6 +13,25 @@ ARCH=arm64 CROSS_COMPILE=aarch64-linux- make
 rename ./busybox to xzcat
 
 
+======== How to build ash/hexdump/xzcat for mips64el ======== 
+#download mips64el-musl cross toolchain from https://github.com/ventoy/musl-cross-make/releases/download/latest/
+#How to get ash.config/hexdump.cofig/xzcat.config
+#ARCH=mips CROSS_COMPILE=mips64el-linux-musl- make allnoconfig "CFLAGS+=-mips64r2 -mabi=64 -Os" "LDFLAGS+=-mips64r2 -mabi=64 -Os"
+#ARCH=mips CROSS_COMPILE=mips64el-linux-musl- make menuconfig  "CFLAGS+=-mips64r2 -mabi=64 -Os" "LDFLAGS+=-mips64r2 -mabi=64 -Os"
+#----> enable static build
+#----> enable xzcat
+#get mips64el_xzcat.config
+
+tar xf busybox-1.32.0.tar.bz2
+cd busybox-1.32.0
+copy mips64el_xzcat.config as .config
+ARCH=mips CROSS_COMPILE=mips64el-linux-musl- make "CFLAGS+=-mips64r2 -mabi=64 -Os" "LDFLAGS+=-mips64r2 -mabi=64 -Os"
+rename ./busybox to xzcat
+
+
+======== How to build full busybox =========
+#make defconfig
+#make menuconfig  select static build
 
 ======== How to build ash/hexdump/xzcat for x86_64 ==========
 #How to get ash.config/hexdump.cofig/xzcat.config

BUSYBOX/chmod/build.sh

@@ -3,13 +3,17 @@
 DSTDIR=../../IMG/cpio/ventoy/busybox
 
 rm -f vtchmod32 vtchmod64 vtchmod64_musl vtchmodaa64
-rm -f $DSTDIR/vtchmod32 $DSTDIR/vtchmod64 $DSTDIR/vtchmodaa64
+rm -f $DSTDIR/vtchmod32 $DSTDIR/vtchmod64 $DSTDIR/vtchmodaa64 $DSTDIR/vtchmodm64e
 
 /opt/diet32/bin/diet  gcc  -Os -m32  vtchmod.c -o  vtchmod32
 /opt/diet64/bin/diet  gcc  -Os       vtchmod.c -o  vtchmod64
 aarch64-linux-gcc -Os -static vtchmod.c -o  vtchmodaa64
 aarch64-linux-strip --strip-all vtchmodaa64
 
+mips64el-linux-musl-gcc  -mips64r2 -mabi=64 -Os -static vtchmod.c -o  vtchmodm64e
+mips64el-linux-musl-strip --strip-all vtchmodm64e
+
+
 gcc -specs "/usr/local/musl/lib/musl-gcc.specs" -Os -static vtchmod.c -o  vtchmod64_musl
 strip --strip-all vtchmod64_musl
 
@@ -17,9 +21,11 @@ chmod 777 vtchmod32
 chmod 777 vtchmod64
 chmod 777 vtchmodaa64
 chmod 777 vtchmod64_musl
+chmod 777 vtchmodm64e
 
 cp -a vtchmod32 $DSTDIR/
 cp -a vtchmod64 $DSTDIR/
 cp -a vtchmodaa64 $DSTDIR/
 cp -a vtchmod64_musl $DSTDIR/
+cp -a vtchmodm64e $DSTDIR/
 

DMSETUP/build.txt

@@ -55,6 +55,16 @@ build for 32bit, static linked with dietlibc
 6. get dmsetup/dmsetup.static as the dmsetupaa64 binary file
 
 
+======================== Build for mips64 dmsetup =========================
+1. extract device mapper source code
+2. ./configure CC="mips64el-linux-musl-gcc -mips64r2 -mabi=64" --target=mips --host=x86_64-linux-gnu --disable-nls  --disable-selinux --disable-shared  --enable-static_link
+3. modify include/configure.h file
+   --- delete the line with "#define malloc rpl_malloc"
+4. make
+5. mips64el-linux-musl-strip dmsetup/dmsetup.static
+6. get dmsetup/dmsetup.static as the dmsetupm64e binary file
+
+
 
 
 

DOC/BuildVentoyFromSource.txt

@@ -34,17 +34,13 @@
     https://codeload.github.com/libfuse/libfuse/zip/fuse-2.9.9           ===>  /home/Ventoy-master/ExFAT/libfuse-fuse-2.9.9.zip
     https://releases.linaro.org/components/toolchain/binaries/7.4-2019.02/aarch64-linux-gnu/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu.tar.xz           ===>  /opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu.tar.xz
     https://toolchains.bootlin.com/downloads/releases/toolchains/aarch64/tarballs/aarch64--uclibc--stable-2020.08-1.tar.bz2 ===> /opt/aarch64--uclibc--stable-2020.08-1.tar.bz2
+    http://ftp.loongnix.org/toolchain/gcc/release/mips-loongson-gcc7.3-2019.06-29-linux-gnu.tar.gz ===> /opt/mips-loongson-gcc7.3-2019.06-29-linux-gnu.tar.gz
+    https://github.com/ventoy/musl-cross-make/releases/download/latest/output.tar.bz2 ===> /opt/output.tar.bz2
+
 
     http://www.tinycorelinux.net/11.x/x86_64/release/distribution_files/vmlinuz64 ===> /home/Ventoy-master/LiveCD/ISO/EFI/boot/vmlinuz64
     http://www.tinycorelinux.net/11.x/x86_64/release/distribution_files/corepure64.gz ===> /home/Ventoy-master/LiveCD/ISO/EFI/boot/corepure64.gz
-    http://www.tinycorelinux.net/11.x/x86_64/release/distribution_files/modules64.gz ===> /home/Ventoy-master/LiveCD/ISO/EFI/boot/modules64.gz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/glib2.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/glib2.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/libffi.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/libffi.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/liblvm2.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/liblvm2.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/ncursesw.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/ncursesw.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/parted.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/parted.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/readline.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/readline.tcz
-    http://distro.ibiblio.org/tinycorelinux/11.x/x86_64/tcz/udev-lib.tcz /home/Ventoy-master/LiveCD/VTOY/ventoy/tcz/udev-lib.tcz
+    http://www.tinycorelinux.net/11.x/x86_64/release/distribution_files/modules64.gz ===> /home/Ventoy-master/LiveCD/ISO/EFI/boot/modules64.gz    
 
 2.3 Prepare third-part tools
     cd /home/Ventoy-master/DOC/
@@ -54,9 +50,12 @@
 
     tar xf /opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu.tar.xz  -C /opt
     tar xf /opt/aarch64--uclibc--stable-2020.08-1.tar.bz2  -C /opt
+    tar xf /opt/output.tar.bz2  -C /opt
+    mv /opt/output /opt/mips64el-linux-musl-gcc730
+    
 
 2.4 Set PATH envrioment
-    export PATH=$PATH:/opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/bin:/opt/aarch64--uclibc--stable-2020.08-1/bin
+    export PATH=$PATH:/opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/bin:/opt/aarch64--uclibc--stable-2020.08-1/bin:/opt/mips64el-linux-musl-gcc730/bin
     better to add this line to /root/.bashrc and relogin as root
 
 

DOC/prepare_env.sh

@@ -6,3 +6,4 @@
 
 [ -d /opt/aarch64--uclibc--stable-2020.08-1 ] || tar xf /opt/aarch64--uclibc--stable-2020.08-1.tar.bz2  -C /opt
 
+[ -d /opt/mips-loongson-gcc7.3-linux-gnu ] || tar xf /opt/mips-loongson-gcc7.3-2019.06-29-linux-gnu.tar.gz  -C /opt

GRUB2/MOD_SRC/grub-2.04/grub-core/Makefile.core.def

@@ -100,6 +100,10 @@ kernel = {
   emu_cppflags = '$(CPPFLAGS_GNULIB)';
   arm_uboot_ldflags       = '-Wl,-r,-d';
   arm_uboot_stripflags    = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version';
+
+  mips64_efi_ldflags          = '-Wl,-r,-d';
+  mips64_efi_stripflags       = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version -R .eh_frame -R .MIPS.abiflags';
+
   arm_coreboot_ldflags       = '-Wl,-r,-d';
   arm_coreboot_stripflags    = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version';
 
@@ -114,6 +118,7 @@ kernel = {
   i386_coreboot_startup = kern/i386/coreboot/startup.S;
   i386_multiboot_startup = kern/i386/coreboot/startup.S;
   mips_startup = kern/mips/startup.S;
+  mips64_efi_startup = kern/mips64/efi/startup.S;
   sparc64_ieee1275_startup = kern/sparc64/ieee1275/crt0.S;
   powerpc_ieee1275_startup = kern/powerpc/ieee1275/startup.S;
   arm_uboot_startup = kern/arm/startup.S;
@@ -310,6 +315,15 @@ kernel = {
   extra_dist = video/sis315_init.c;
   mips_loongson = commands/keylayouts.c;
 
+  mips64 = kern/mips64/init.c;
+  mips64 = kern/mips64/dl.c;
+  mips64 = kern/mips64/cache.S;
+  mips64 = kern/generic/rtc_get_time_ms.c;
+  mips64_efi = kern/mips64/efi/init.c;
+  mips64_efi = kern/mips64/efi/loongson.c;
+  mips64_efi = lib/mips64/efi/loongson.c;
+  mips64_efi = lib/mips64/efi/loongson_asm.S;
+
   powerpc_ieee1275 = kern/powerpc/cache.S;
   powerpc_ieee1275 = kern/powerpc/dl.c;
   powerpc_ieee1275 = kern/powerpc/compiler-rt.S;
@@ -828,6 +842,7 @@ module = {
   enable = sparc64_ieee1275;
   enable = powerpc_ieee1275;
   enable = mips_arc;
+  enable = mips64_efi;
   enable = ia64_efi;
   enable = arm_efi;
   enable = arm64_efi;
@@ -1667,6 +1682,8 @@ module = {
   efi = lib/efi/relocator.c;
   mips = lib/mips/relocator_asm.S;
   mips = lib/mips/relocator.c;
+  mips64 = lib/mips64/relocator_asm.S;
+  mips64 = lib/mips64/relocator.c;
   powerpc = lib/powerpc/relocator_asm.S;
   powerpc = lib/powerpc/relocator.c;
   xen = lib/xen/relocator.c;
@@ -1679,6 +1696,7 @@ module = {
   extra_dist = kern/powerpc/cache_flush.S;
 
   enable = mips;
+  enable = mips64;
   enable = powerpc;
   enable = x86;
   enable = i386_xen_pvh;
@@ -1809,6 +1827,7 @@ module = {
   i386_pc = lib/i386/pc/vesa_modes_table.c;
   i386_xen_pvh = lib/i386/pc/vesa_modes_table.c;
   mips = loader/mips/linux.c;
+  mips64 = loader/mips64/linux.c;
   powerpc_ieee1275 = loader/powerpc/ieee1275/linux.c;
   sparc64_ieee1275 = loader/sparc64/ieee1275/linux.c;
   ia64_efi = loader/ia64/efi/linux.c;
@@ -1915,6 +1934,7 @@ module = {
   enable = riscv32_efi;
   enable = riscv64_efi;
   enable = mips;
+  enable = mips64_efi;
 };
 
 module = {

GRUB2/MOD_SRC/grub-2.04/grub-core/kern/mips64/cache.S

+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009,2017  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+FUNCTION (grub_arch_sync_caches)
+	jr.hb	$ra
+

GRUB2/MOD_SRC/grub-2.04/grub-core/kern/mips64/dl.c

+/* dl-mips64.c - arch-dependent part of loadable module support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2005,2007,2009,2017  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/cpu/types.h>
+#include <grub/mm.h>
+#include <grub/i18n.h>
+
+/* Check if EHDR is a valid ELF header.  */
+grub_err_t
+grub_arch_dl_check_header (void *ehdr)
+{
+  Elf_Ehdr *e = ehdr;
+
+  /* Check the magic numbers.  */
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+  if (e->e_ident[EI_CLASS] != ELFCLASS64
+      || e->e_ident[EI_DATA] != ELFDATA2MSB
+      || e->e_machine != EM_MIPS)
+#else
+  if (e->e_ident[EI_CLASS] != ELFCLASS64
+      || e->e_ident[EI_DATA] != ELFDATA2LSB
+      || e->e_machine != EM_MIPS)
+#endif
+    return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
+
+  return GRUB_ERR_NONE;
+}
+
+#pragma GCC diagnostic ignored "-Wcast-align"
+
+grub_err_t
+grub_arch_dl_get_tramp_got_size (const void *ehdr __attribute__ ((unused)),
+				 grub_size_t *tramp, grub_size_t *got)
+{
+  *tramp = 0;
+  *got = 0;
+  return GRUB_ERR_NONE;
+}
+
+/* Relocate symbols.  */
+grub_err_t
+grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
+			       Elf_Shdr *s, grub_dl_segment_t seg)
+{
+  Elf_Ehdr *e = ehdr;
+  Elf_Rel *rel, *max;
+
+  for (rel = (Elf_Rel *) ((char *) e + s->sh_offset),
+	 max = (Elf_Rel *) ((char *) rel + s->sh_size);
+       rel < max;
+       rel = (Elf_Rel *) ((char *) rel + s->sh_entsize))
+    {
+      grub_uint8_t *addr;
+      Elf_Sym *sym;
+      Elf_Addr r_info;
+      grub_uint64_t sym_value;
+
+      if (seg->size < rel->r_offset)
+	return grub_error (GRUB_ERR_BAD_MODULE,
+			   "reloc offset is out of the segment");
+
+      r_info = ((grub_uint64_t) rel->r_info << 32) |
+              (grub_uint32_t) grub_be_to_cpu64 (rel->r_info);
+
+      addr = (grub_uint8_t *) ((char *) seg->addr + rel->r_offset);
+      sym = (Elf_Sym *) ((char *) mod->symtab
+			 + mod->symsize * ELF_R_SYM (r_info));
+      sym_value = sym->st_value;
+      if (s->sh_type == SHT_RELA)
+	{
+	  sym_value += ((Elf_Rela *) rel)->r_addend;
+	}
+      switch (ELF_R_TYPE (r_info))
+	{
+	case R_MIPS_64:
+	  *(grub_uint64_t *) addr += sym_value;
+	  break;
+	case R_MIPS_32:
+	  *(grub_uint32_t *) addr += sym_value;
+	  break;
+	case R_MIPS_26:
+	  {
+	    grub_uint32_t value;
+	    grub_uint32_t raw;
+	    raw = (*(grub_uint32_t *) addr) & 0x3ffffff;
+	    value = raw << 2;
+	    value += sym_value;
+	    raw = (value >> 2) & 0x3ffffff;
+
+	    *(grub_uint32_t *) addr =
+	      raw | ((*(grub_uint32_t *) addr) & 0xfc000000);
+	  }
+	  break;
+	case R_MIPS_LO16:
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+	  addr += 2;
+#endif
+	  *(grub_uint16_t *) addr = (grub_int16_t) sym_value;
+	  break;
+	case R_MIPS_HI16:
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+	  addr += 2;
+#endif
+	  *(grub_uint16_t *) addr = (grub_int16_t) ((sym_value + 0x8000UL) >> 16);
+	  break;
+	case R_MIPS_HIGHER:
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+	  addr += 2;
+#endif
+	  *(grub_uint16_t *) addr = (grub_int16_t) ((sym_value + 0x80008000UL) >> 32);
+	  break;
+	case R_MIPS_HIGHEST:
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+	  addr += 2;
+#endif
+	  *(grub_uint16_t *) addr = (grub_uint16_t) ((sym_value + 0x800080008000UL) >> 48);
+	  break;
+	default:
+	  {
+	    return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+			       N_("relocation 0x%x is not implemented yet"),
+			       ELF_R_TYPE (r_info));
+	  }
+	  break;
+	}
+    }
+
+  return GRUB_ERR_NONE;
+}
+

GRUB2/MOD_SRC/grub-2.04/grub-core/kern/mips64/efi/init.c

+/* init.c - initialize an arm-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/cpu/time.h>
+#include <grub/efi/efi.h>
+#include <grub/loader.h>
+#include <grub/time.h>
+#include <grub/machine/loongson.h>
+
+static grub_uint64_t tmr;
+static grub_efi_event_t tmr_evt;
+
+static grub_uint64_t
+grub_efi_get_time_ms (void)
+{
+  return tmr;
+}
+
+static void
+grub_loongson_increment_timer (grub_efi_event_t event __attribute__ ((unused)),
+                 void *context __attribute__ ((unused)))
+{
+  tmr += 10;
+}
+
+
+
+void
+grub_machine_init (void)
+{
+  grub_efi_boot_services_t *b;
+
+  grub_efi_init ();
+  
+  b = grub_efi_system_table->boot_services;
+  efi_call_5 (b->create_event, GRUB_EFI_EVT_TIMER | GRUB_EFI_EVT_NOTIFY_SIGNAL,
+              GRUB_EFI_TPL_CALLBACK, grub_loongson_increment_timer, NULL, &tmr_evt);
+  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 100000);
+
+  grub_install_get_time_ms (grub_efi_get_time_ms);
+
+  if (grub_efi_is_loongson ())
+    grub_efi_loongson_init ();
+  else
+    /* FIXME: Get cpuclock from EFI. */
+    grub_timer_init (1000000000U);
+}
+
+void
+grub_machine_fini (int flags)
+{
+  grub_efi_boot_services_t *b;
+
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  b = grub_efi_system_table->boot_services;
+
+  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_CANCEL, 0);
+  efi_call_1 (b->close_event, tmr_evt);
+
+  if (grub_efi_is_loongson ())
+    grub_efi_loongson_fini ();
+  grub_efi_fini ();
+}

GRUB2/MOD_SRC/grub-2.04/grub-core/kern/mips64/efi/loongson.c

+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2017 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/efi/efi.h>
+#include <grub/cpu/time.h>
+#include <grub/loader.h>
+#include <grub/machine/loongson.h>
+
+void
+grub_efi_loongson_init (void)
+{
+}
+
+void
+grub_efi_loongson_fini (void)
+{
+}
+

GRUB2/MOD_SRC/grub-2.04/grub-core/kern/mips64/efi/startup.S

+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file 	"startup.S"
+	.text
+
+	.set		push
+	.align		4
+
+FUNCTION(_start)
+	/*
+	 *  EFI_SYSTEM_TABLE and EFI_HANDLE are passed in a1/a0.
+	 */
+	daddiu		$sp, -16
+	sd		$ra, ($sp)
+
+	dla		$a2, grub_efi_image_handle
+	sd		$a0, ($a2)
+	dla		$a2, grub_efi_system_table
+	sd		$a1, ($a2)
+
+	jal		grub_main
+
+1:
+	ld		$ra, ($sp)
+	daddiu		$sp, 16
+	jr		$ra
+
+	.set		pop
+