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;
+}