[PATCH] libpayload: Add multiboot support

Make libpayload applications multiboot compatible.  Add the
multiboot OS table and grok the loader table, especially the
memory map and the command line.  This makes libpayload 
applications loadable by GRUB.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Peter Stuge <peter@stuge.se>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3673 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 96 insertions, 0 deletions

diff --git a/payloads/libpayload/i386/multiboot.c b/payloads/libpayload/i386/multiboot.c
new file mode 100644
index 0000000000..09e72c768b
--- /dev/null
+++ b/payloads/libpayload/i386/multiboot.c
@@ -0,0 +1,96 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+#include <libpayload.h>
+#include <multiboot_tables.h>
+
+extern unsigned long loader_eax;
+extern unsigned long loader_ebx;
+
+static void mb_parse_mmap(struct multiboot_header *table,
+			struct sysinfo_t *info)
+{
+	u8 *start = (u8 *) phys_to_virt(table->mmap_addr);
+	u8 *ptr = start;
+
+	info->n_memranges = 0;
+
+	while(ptr < (start + table->mmap_length)) {
+		struct multiboot_mmap *mmap = (struct multiboot_mmap *) ptr;
+
+		/* 1 == normal RAM.  Ignore everything else for now */
+
+		if (mmap->type == 1) {
+			info->memrange[info->n_memranges].base = mmap->addr;
+			info->memrange[info->n_memranges].size = mmap->length;
+
+			if (++info->n_memranges == SYSINFO_MAX_MEM_RANGES)
+				return;
+		}
+
+		ptr += (mmap->size + sizeof(mmap->size));
+	}
+}
+
+static void mb_parse_cmdline(struct multiboot_header *table)
+{
+	extern int main_argc;
+	extern char *main_argv[];
+	char *c = phys_to_virt(table->cmdline);
+
+	while(*c != '\0' && main_argc < MAX_ARGC_COUNT) {
+		main_argv[main_argc++] = c;
+
+		for( ; *c != '\0' && !isspace(*c); c++);
+
+		if (*c) {
+			*c = 0;
+			c++;
+		}
+	}
+}
+
+int get_multiboot_info(struct sysinfo_t *info)
+{
+	struct multiboot_header *table;
+
+	if (loader_eax != MULTIBOOT_MAGIC)
+		return -1;
+
+	table = (struct multiboot_header *) phys_to_virt(loader_ebx);
+
+	if (table->flags & MULTIBOOT_FLAGS_MMAP)
+		mb_parse_mmap(table, info);
+
+	if (table->flags & MULTIBOOT_FLAGS_CMDLINE)
+		mb_parse_cmdline(table);
+
+	return 0;
+}