New patch to review for coreboot: bdafc8a x86: mmap boot device support

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9133

-gerrit

commit bdafc8a07fc42ec11c27eff4c30ec55d2836b66e
Author: Aaron Durbin 
Date:   Thu Mar 26 20:37:21 2015 -0500

x86: mmap boot device support

Change-Id: I81482d404af8327a71e64df112fdb94bed36e4d7
    Signed-off-by: Aaron Durbin 
---
 src/arch/x86/lib/Makefile.inc |  3 ++
 src/arch/x86/lib/mmap_boot.c  | 78 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)

diff --git a/src/arch/x86/lib/Makefile.inc b/src/arch/x86/lib/Makefile.inc
index c7e8b62..e308be9 100644
--- a/src/arch/x86/lib/Makefile.inc
+++ b/src/arch/x86/lib/Makefile.inc
@@ -6,6 +6,7 @@ romstage-y += memset.c
 romstage-y += memcpy.c
 romstage-y += memmove.c
 romstage-y += rom_media.c
+romstage-y += mmap_boot.c

endif # CONFIG_ARCH_ROMSTAGE_X86_32

@@ -22,6 +23,7 @@ ramstage-y += memcpy.c
 ramstage-y += memmove.c
 ramstage-y += ebda.c
 ramstage-y += rom_media.c
+ramstage-y += mmap_boot.c
 ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c
 ramstage-$(CONFIG_COOP_MULTITASKING) += thread_switch.S
 ramstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
@@ -32,6 +34,7 @@ smm-y += memset.c
 smm-y += memcpy.c
 smm-y += memmove.c
 smm-y += rom_media.c
+smm-y += mmap_boot.c

rmodules_x86_32-y += memset.c
 rmodules_x86_32-y += memcpy.c
diff --git a/src/arch/x86/lib/mmap_boot.c b/src/arch/x86/lib/mmap_boot.c
new file mode 100644
index 0000000..a65471b
--- /dev/null
+++ b/src/arch/x86/lib/mmap_boot.c
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * This program 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; version 2 of the License.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <cbfs.h>
+#include <endian.h>
+#include <region.h>
+
+/* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */
+#define rom_base ((void *)(uintptr_t)(-(int32_t)CONFIG_ROM_SIZE))
+
+static const struct mem_region_device boot_dev =
+	MEM_REGION_DEV_INIT(rom_base, CONFIG_ROM_SIZE);
+
+const struct region_device *cbfs_boot_device(void)
+{
+	return &boot_dev.rdev;
+}
+
+void cbfs_boot_device_init(void)
+{
+}
+
+int cbfs_boot_region_properties(struct cbfs_props *props)
+{
+	struct cbfs_header header;
+	int32_t offset;
+	const struct region_device *bdev;
+
+	bdev = cbfs_boot_device();
+
+	rdev_readat(bdev, &offset, CONFIG_ROM_SIZE - 4, sizeof(offset));
+
+	/* The offset is relative to the end of the media. */
+	offset += CONFIG_ROM_SIZE;
+
+	rdev_readat(bdev, &header , offset, sizeof(header));
+
+	header.magic = ntohl(header.magic);
+	header.version = ntohl(header.version);
+	header.romsize = ntohl(header.romsize);
+	header.bootblocksize = ntohl(header.bootblocksize);
+	header.align = ntohl(header.align);
+	header.offset = ntohl(header.offset);
+	header.architecture = ntohl(header.architecture);
+
+	if (header.magic != CBFS_HEADER_MAGIC)
+		return -1;
+
+	props->align = header.align;
+	props->offset = header.offset;
+	if (CONFIG_ROM_SIZE != header.romsize)
+		props->size = CONFIG_ROM_SIZE;
+	else
+		props->size = header.romsize;
+	props->size -= props->offset;
+	props->size -= header.bootblocksize;
+	props->size = ALIGN_DOWN(props->size, props->align);
+
+	return 0;
+}