Chainloading on coreboot support.

* grub-core/Makefile.core.def (chain): Add coreboot.
	* grub-core/loader/i386/coreboot/chainloader.c: New file.

ChangeLog

@@ -1,3 +1,10 @@
+2011-06-27  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	Chainloading on coreboot support.
+
+	* grub-core/Makefile.core.def (chain): Add coreboot.
+	* grub-core/loader/i386/coreboot/chainloader.c: New file.
+
 2011-06-27  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/loader/i386/bsd.c (grub_bsd_load): Handle relocator failure

grub-core/Makefile.core.def

@@ -1298,7 +1298,9 @@ module = {
   name = chain;
   efi = loader/efi/chainloader.c;
   i386_pc = loader/i386/pc/chainloader.c;
+  i386_coreboot = loader/i386/corepayload.c;
   enable = i386_pc;
+  enable = i386_coreboot;
   enable = efi;
 };
 

grub-core/loader/i386/coreboot/chainloader.c

@@ -0,0 +1,145 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2011  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/loader.h>
+#include <grub/memory.h>
+#include <grub/i386/memory.h>
+#include <grub/file.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/elfload.h>
+#include <grub/video.h>
+#include <grub/relocator.h>
+#include <grub/i386/relocator.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_addr_t entry;
+static struct grub_relocator *relocator = NULL;
+
+static grub_err_t
+grub_chain_boot (void)
+{
+  struct grub_relocator32_state state;
+
+  grub_video_set_mode ("text", 0, 0);
+
+  state.eip = entry;
+  return grub_relocator32_boot (relocator, state);
+}
+
+static grub_err_t
+grub_chain_unload (void)
+{
+  grub_relocator_unload (relocator);
+  relocator = NULL;
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_chain_elf32_hook (Elf32_Phdr * phdr, grub_addr_t * addr, int *do_load)
+{
+  grub_err_t err;
+  grub_relocator_chunk_t ch;
+
+  if (phdr->p_type != PT_LOAD)
+    {
+      *do_load = 0;
+      return 0;
+    }
+
+  *do_load = 1;
+  err = grub_relocator_alloc_chunk_addr (relocator, &ch,
+					 phdr->p_paddr, phdr->p_memsz);
+  if (err)
+    return err;
+
+  *addr = (grub_addr_t) get_virtual_current_address (ch);
+
+  return GRUB_ERR_NONE;
+}
+
+
+static grub_err_t
+grub_cmd_chain (grub_command_t cmd __attribute__ ((unused)),
+		int argc, char *argv[])
+{
+  grub_err_t err;
+  grub_file_t file;
+  grub_elf_t elf;
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "filename expected");
+
+  grub_loader_unset ();
+
+  file = grub_file_open (argv[0]);
+  if (!file)
+    return grub_errno;
+
+  relocator = grub_relocator_new ();
+  if (!relocator)
+    {
+      grub_file_close (file);
+      return grub_errno;
+    }
+
+  elf = grub_elf_file (file);
+  if (!elf)
+    {
+      grub_relocator_unload (relocator);
+      relocator = 0;
+      grub_file_close (file);
+    }
+
+  if (!grub_elf_is_elf32 (elf))
+    {
+      grub_relocator_unload (relocator);
+      relocator = 0;
+      grub_elf_close (elf);
+    }
+
+  entry = elf->ehdr.ehdr32.e_entry & 0xFFFFFF;
+  
+  err = grub_elf32_load (elf, grub_chain_elf32_hook, 0, 0);
+
+  grub_elf_close (elf);
+  if (err)
+    return err;
+
+  grub_loader_set (grub_chain_boot, grub_chain_unload, 0);
+  return GRUB_ERR_NONE;
+}
+
+static grub_command_t cmd_chain;
+
+GRUB_MOD_INIT (chain)
+{
+  cmd_chain = grub_register_command ("chainloader", grub_cmd_chain,
+				     N_("FILE"), N_("Load another payload"));
+}
+
+GRUB_MOD_FINI (chain)
+{
+  grub_unregister_command (cmd_chain);
+  grub_chain_unload ();
+}