mips multiboot2 support

conf/mips.rmk

@@ -30,4 +30,11 @@ relocator_mod_CFLAGS = $(COMMON_CFLAGS)
 relocator_mod_ASFLAGS = $(COMMON_ASFLAGS)
 relocator_mod_LDFLAGS = $(COMMON_LDFLAGS)
 
+pkglib_MODULES += multiboot2.mod
+multiboot2_mod_SOURCES = loader/i386/multiboot.c \
+			 loader/i386/multiboot_mbi2.c
+multiboot2_mod_CFLAGS = $(COMMON_CFLAGS) -DGRUB_USE_MULTIBOOT2
+multiboot2_mod_LDFLAGS = $(COMMON_LDFLAGS)
+multiboot2_mod_ASFLAGS = $(COMMON_ASFLAGS)
+
 include $(srcdir)/conf/common.mk

include/grub/i386/multiboot.h

@@ -24,4 +24,18 @@ extern char *grub_multiboot_payload_orig;
 extern grub_addr_t grub_multiboot_payload_dest;
 extern grub_size_t grub_multiboot_payload_size;
 
+#define MULTIBOOT_INITIAL_STATE  { .eax = MULTIBOOT_BOOTLOADER_MAGIC,	\
+    .ecx = 0,								\
+    .edx = 0,								\
+    /* Set esp to some random location in low memory to avoid breaking */ \
+    /* non-compliant kernels.  */					\
+    .esp = 0x7ff00							\
+      }
+#define MULTIBOOT_ENTRY_REGISTER eip
+#define MULTIBOOT_MBI_REGISTER ebx
+#define MULTIBOOT_ARCHITECTURE_CURRENT MULTIBOOT_ARCHITECTURE_I386
+
+#define MULTIBOOT_ELF32_MACHINE EM_386
+#define MULTIBOOT_ELF64_MACHINE EM_X86_64
+
 #endif /* ! GRUB_MULTIBOOT_CPU_HEADER */

include/grub/mips/multiboot.h

@@ -0,0 +1,36 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2004,2007,2008,2009  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/>.
+ */
+
+#ifndef GRUB_MULTIBOOT_CPU_HEADER
+#define GRUB_MULTIBOOT_CPU_HEADER	1
+
+extern grub_uint32_t grub_multiboot_payload_eip;
+extern char *grub_multiboot_payload_orig;
+extern grub_addr_t grub_multiboot_payload_dest;
+extern grub_size_t grub_multiboot_payload_size;
+
+#define MULTIBOOT_INITIAL_STATE  { .gpr[4] = MULTIBOOT_BOOTLOADER_MAGIC, \
+    .jumpreg = 1 }
+#define MULTIBOOT_ENTRY_REGISTER gpr[1]
+#define MULTIBOOT_MBI_REGISTER gpr[5]
+#define MULTIBOOT_ARCHITECTURE_CURRENT MULTIBOOT_ARCHITECTURE_MIPS32
+
+#define MULTIBOOT_ELF32_MACHINE EM_MIPS
+#define MULTIBOOT_ELF64_MACHINE EM_MIPS
+
+#endif /* ! GRUB_MULTIBOOT_CPU_HEADER */

include/multiboot2.h

@@ -61,7 +61,8 @@
 #define MULTIBOOT_HEADER_TAG_FRAMEBUFFER  5
 #define MULTIBOOT_HEADER_TAG_MODULE_ALIGN  6
 
-#define GRUB_MULTIBOOT_ARCHITECTURE_I386  0
+#define MULTIBOOT_ARCHITECTURE_I386  0
+#define MULTIBOOT_ARCHITECTURE_MIPS32  4
 #define MULTIBOOT_HEADER_TAG_OPTIONAL 1
 
 #define MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED 1

loader/i386/multiboot.c

@@ -41,7 +41,7 @@
 #include <grub/misc.h>
 #include <grub/gzio.h>
 #include <grub/env.h>
-#include <grub/i386/relocator.h>
+#include <grub/cpu/relocator.h>
 #include <grub/video.h>
 #include <grub/memory.h>
 #include <grub/i18n.h>
@@ -121,16 +121,9 @@ grub_multiboot_boot (void)
 {
   grub_size_t mbi_size;
   grub_err_t err;
-  struct grub_relocator32_state state =
-    {
-      .eax = MULTIBOOT_BOOTLOADER_MAGIC,
-      .ecx = 0,
-      .edx = 0,
-      .eip = grub_multiboot_payload_eip,
-      /* Set esp to some random location in low memory to avoid breaking
-	 non-compliant kernels.  */
-      .esp = 0x7ff00
-    };
+  struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE;
+
+  state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
 
   mbi_size = grub_multiboot_get_mbi_size ();
   if (grub_multiboot_alloc_mbi < mbi_size)
@@ -143,7 +136,8 @@ grub_multiboot_boot (void)
       grub_multiboot_alloc_mbi = mbi_size;
     }
 
-  state.ebx = grub_multiboot_payload_dest + grub_multiboot_pure_size;
+  state.MULTIBOOT_MBI_REGISTER = grub_multiboot_payload_dest
+    + grub_multiboot_pure_size;
   err = grub_multiboot_make_mbi (grub_multiboot_payload_orig,
 				 grub_multiboot_payload_dest,
 				 grub_multiboot_pure_size, mbi_size);

loader/i386/multiboot_elfxx.c

@@ -18,13 +18,13 @@
 
 #if defined(MULTIBOOT_LOAD_ELF32)
 # define XX		32
-# define E_MACHINE	EM_386
+# define E_MACHINE	MULTIBOOT_ELF32_MACHINE
 # define ELFCLASSXX	ELFCLASS32
 # define Elf_Ehdr	Elf32_Ehdr
 # define Elf_Phdr	Elf32_Phdr
 #elif defined(MULTIBOOT_LOAD_ELF64)
 # define XX		64
-# define E_MACHINE	EM_X86_64
+# define E_MACHINE	MULTIBOOT_ELF64_MACHINE
 # define ELFCLASSXX	ELFCLASS64
 # define Elf_Ehdr	Elf64_Ehdr
 # define Elf_Phdr	Elf64_Phdr

loader/i386/multiboot_mbi2.c

@@ -90,7 +90,8 @@ grub_multiboot_load (grub_file_t file)
     {
       if (header->magic == MULTIBOOT_HEADER_MAGIC
 	  && !(header->magic + header->architecture
-	       + header->header_length + header->checksum))
+	       + header->header_length + header->checksum)
+	  && header->architecture == MULTIBOOT_ARCHITECTURE_CURRENT)
 	break;
     }