cbfs: hardcode file alignment

Assume that it's 64 byte.

Change-Id: I168facd92f64c2cf99c26c350c60317807a4aed4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10919
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/mmap_boot.c

@@ -53,13 +53,11 @@ int cbfs_boot_region_properties(struct cbfs_props *props)
 	header.magic = ntohl(header.magic);
 	header.romsize = ntohl(header.romsize);
 	header.bootblocksize = ntohl(header.bootblocksize);
-	header.align = ntohl(header.align);
 	header.offset = ntohl(header.offset);
 
 	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;
@@ -67,7 +65,7 @@ int cbfs_boot_region_properties(struct cbfs_props *props)
 		props->size = header.romsize;
 	props->size -= props->offset;
 	props->size -= header.bootblocksize;
-	props->size = ALIGN_DOWN(props->size, props->align);
+	props->size = ALIGN_DOWN(props->size, 64);
 
 	printk(BIOS_DEBUG, "CBFS @ %zx size %zx\n", props->offset, props->size);
 

src/arch/x86/walkcbfs.S

@@ -7,6 +7,9 @@
 #define CBFS_HEADER_ALIGN (CBFS_HEADER_BOOTBLOCKSIZE + 4)
 #define CBFS_HEADER_OFFSET (CBFS_HEADER_ALIGN + 4)
 
+/* we use this instead of CBFS_HEADER_ALIGN because the latter is retired. */
+#define CBFS_ALIGNMENT 64
+
 #define CBFS_FILE_MAGIC 0
 #define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8)
 #define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4)
@@ -74,13 +77,9 @@ tryharder:
 	mov CBFS_FILE_LEN(%ebx), %edi
 	bswap %edi
 	add %edi, %ecx
-	mov CBFS_HEADER_PTR, %edi
-	mov CBFS_HEADER_ALIGN(%edi), %edi
-	bswap %edi
-	sub $1, %edi
-	add %edi, %ecx
-	not %edi
-	and %edi, %ecx
+	/* round by 64 bytes */
+	add $(CBFS_ALIGNMENT - 1), %ecx
+	and $~(CBFS_ALIGNMENT - 1), %ecx
 
 	/* if oldaddr >= addr, leave */
 	cmp %ebx, %ecx
@@ -106,11 +105,8 @@ out:
 
 
 searchfile:
-	/* if filemagic isn't found, move forward cbfs_header->align bytes */
-	mov CBFS_HEADER_PTR, %edi
-	mov CBFS_HEADER_ALIGN(%edi), %edi
-	bswap %edi
-	add %edi, %ebx
+	/* if filemagic isn't found, move forward 64 bytes */
+	add $CBFS_ALIGNMENT, %ebx
 	jmp check_for_exit
 
 filemagic:

src/include/cbfs.h

@@ -66,13 +66,10 @@ int cbfs_locate(struct region_device *fh, const struct cbfsd *cbfs,
 
 struct cbfsd {
 	const struct region_device *rdev;
-	size_t align;
 };
 
 /* The cbfs_props struct describes the properties associated with a CBFS. */
 struct cbfs_props {
-	/* Each file is aligned. */
-	size_t align;
 	/* CBFS starts at the following offset within the boot region. */
 	size_t offset;
 	/* CBFS size. */

src/include/cbfs_serialized.h

@@ -95,12 +95,15 @@ struct cbfs_header {
 	uint32_t version;
 	uint32_t romsize;
 	uint32_t bootblocksize;
-	uint32_t align;
+	uint32_t align; /* fixed to 64 bytes */
 	uint32_t offset;
 	uint32_t architecture;
 	uint32_t pad[1];
 } __attribute__((packed));
 
+/* this used to be flexible, but wasn't ever set to something different. */
+#define CBFS_ALIGNMENT 64
+
 /* "Unknown" refers to CBFS headers version 1,
  * before the architecture was defined (i.e., x86 only).
  */

src/lib/cbfs.c

@@ -57,7 +57,6 @@ int cbfs_boot_locate(struct region_device *fh, const char *name, uint32_t *type)
 		return -1;
 
 	cbfs.rdev = &rdev;
-	cbfs.align = props.align;
 
 	return cbfs_locate(fh, &cbfs, name, type);
 }
@@ -83,11 +82,9 @@ int cbfs_locate(struct region_device *fh, const struct cbfsd *cbfs,
 {
 	size_t offset;
 	const struct region_device *rd;
-	size_t align;
 
 	offset = 0;
 	rd = cbfs->rdev;
-	align = cbfs->align;
 
 	LOG("Locating '%s'\n", name);
 
@@ -107,7 +104,7 @@ int cbfs_locate(struct region_device *fh, const struct cbfsd *cbfs,
 
 		if (memcmp(file.magic, CBFS_FILE_MAGIC, sizeof(file.magic))) {
 			offset++;
-			offset = ALIGN_UP(offset, align);
+			offset = ALIGN_UP(offset, CBFS_ALIGNMENT);
 			continue;
 		}
 
@@ -127,14 +124,14 @@ int cbfs_locate(struct region_device *fh, const struct cbfsd *cbfs,
 		if (!name_match) {
 			DEBUG(" Unmatched '%s' at %zx\n", fname, offset);
 			offset += file.offset + file.len;
-			offset = ALIGN_UP(offset, align);
+			offset = ALIGN_UP(offset, CBFS_ALIGNMENT);
 			continue;
 		}
 
 		if (type != NULL && *type != file.type) {
 			DEBUG(" Unmatched type %x at %zx\n", file.type, offset);
 			offset += file.offset + file.len;
-			offset = ALIGN_UP(offset, align);
+			offset = ALIGN_UP(offset, CBFS_ALIGNMENT);
 			continue;
 		}
 

src/lib/cbfs_boot_props.c

@@ -49,13 +49,11 @@ int __attribute__((weak)) cbfs_boot_region_properties(struct cbfs_props *props)
 
 	header.magic = ntohl(header.magic);
 	header.romsize = ntohl(header.romsize);
-	header.align = ntohl(header.align);
 	header.offset = ntohl(header.offset);
 
 	if (header.magic != CBFS_HEADER_MAGIC)
 		return -1;
 
-	props->align = header.align;
 	props->offset = header.offset;
 	props->size = header.romsize;
 	props->size -= props->offset;

src/vendorcode/google/chromeos/vboot2/vboot_loader.c

@@ -173,7 +173,6 @@ static int vboot_locate_by_multi_cbfs(const struct region_device *fw_main,
 		return -1;
 
 	cbfs.rdev = &rdev;
-	cbfs.align = props.align;
 
 	return cbfs_locate(asset_rdev(asset), &cbfs, asset_name(asset), NULL);
 }