CBFS stuff:

- update, add, and improve comments
- whitespace here and there
- remove unused or write-only variables
- improve debug output
- only build payload.{nrv2b,lzma} for non-cbfs
- improved error checking in cbfstool

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Peter Stuge <peter@stuge.se>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4466 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

6 files changed, 131 insertions, 56 deletions

diff --git a/src/arch/i386/Config.lb b/src/arch/i386/Config.lb
index 1691d29a79..4c6278acb5 100644
--- a/src/arch/i386/Config.lb
+++ b/src/arch/i386/Config.lb
@@ -5,6 +5,7 @@ uses CONFIG_USE_INIT
 uses CONFIG_HAVE_FAILOVER_BOOT
 uses CONFIG_USE_FAILOVER_IMAGE
 uses CONFIG_USE_FALLBACK_IMAGE
+uses CONFIG_CBFS
 
 init init/crt0.S.lb
 
@@ -82,9 +83,12 @@ end
 # catch the case where there is no compression
 makedefine PAYLOAD-1:=payload
 
+if CONFIG_CBFS
+else
 # match the case where a compression type is specified.
 makedefine PAYLOAD-$(CONFIG_COMPRESSED_PAYLOAD_NRV2B):=payload.nrv2b
 makedefine PAYLOAD-$(CONFIG_COMPRESSED_PAYLOAD_LZMA):=payload.lzma
+end
 
 # catch the case where there is precompression. Yes, this bites. 
 if CONFIG_PRECOMPRESSED_PAYLOAD 
diff --git a/src/arch/i386/init/crt0.S.lb b/src/arch/i386/init/crt0.S.lb
index e60144840c..3865ba3c3f 100644
--- a/src/arch/i386/init/crt0.S.lb
+++ b/src/arch/i386/init/crt0.S.lb
@@ -142,7 +142,7 @@ str_copying_to_ram:  .string "Uncompressing coreboot to RAM.\r\n"
 #else
 str_copying_to_ram:  .string "Copying coreboot to RAM.\r\n"
 #endif
-#if CONFIG_CBFS
+#if CONFIG_CBFS == 1
 # if CONFIG_USE_FALLBACK_IMAGE == 1
 str_coreboot_ram_name:	.string "fallback/coreboot_ram"
 # else
diff --git a/src/boot/elfboot.c b/src/boot/elfboot.c
index e633962799..958112d669 100644
--- a/src/boot/elfboot.c
+++ b/src/boot/elfboot.c
@@ -107,11 +107,11 @@ int verify_ip_checksum(
  * a machine, and implementing general relocation is hard.
  *
  * The solution:
- * - Allocate a buffer twice the size of the coreboot image.
- * - Anything that would overwrite coreboot copy into the lower half of
+ * - Allocate a buffer the size of the coreboot image plus additional
+ *   required space.
+ * - Anything that would overwrite coreboot copy into the lower part of
  *   the buffer. 
- * - After loading an ELF image copy coreboot to the upper half of the
- *   buffer.
+ * - After loading an ELF image copy coreboot to the top of the buffer.
  * - Then jump to the loaded image.
  * 
  * Benefits:
diff --git a/src/boot/selfboot.c b/src/boot/selfboot.c
index faeadba0f0..254c131a53 100644
--- a/src/boot/selfboot.c
+++ b/src/boot/selfboot.c
@@ -74,15 +74,13 @@ struct ip_checksum_vcb {
 void * cbfs_load_payload(struct lb_memory *lb_mem, const char *name)
 {
 	int selfboot(struct lb_memory *mem, struct cbfs_payload *payload);
-	struct cbfs_payload *payload = (struct cbfs_payload *)
-		cbfs_find_file(name, CBFS_TYPE_PAYLOAD);
-
-	struct cbfs_payload_segment *segment, *first_segment;
+	struct cbfs_payload *payload;
 
+	payload = (struct cbfs_payload *)cbfs_find_file(name, CBFS_TYPE_PAYLOAD);
 	if (payload == NULL)
 		return (void *) -1;
 	printk_debug("Got a payload\n");
-	first_segment = segment = &payload->segments;
+
 	selfboot(lb_mem, payload);
 	printk_emerg("SELFBOOT RETURNED!\n");
 
@@ -95,11 +93,11 @@ void * cbfs_load_payload(struct lb_memory *lb_mem, const char *name)
  * a machine, and implementing general relocation is hard.
  *
  * The solution:
- * - Allocate a buffer twice the size of the coreboot image.
- * - Anything that would overwrite coreboot copy into the lower half of
+ * - Allocate a buffer the size of the coreboot image plus additional
+ *   required space.
+ * - Anything that would overwrite coreboot copy into the lower part of
  *   the buffer. 
- * - After loading an ELF image copy coreboot to the upper half of the
- *   buffer.
+ * - After loading an ELF image copy coreboot to the top of the buffer.
  * - Then jump to the loaded image.
  * 
  * Benefits:
@@ -270,9 +268,9 @@ static void relocate_segment(unsigned long buffer, struct segment *seg)
 				new->s_dstaddr, 
 				new->s_dstaddr + new->s_filesz,
 				new->s_dstaddr + new->s_memsz);
-			}
+		}
 			
-			/* Slice off a piece at the end 
+		/* Slice off a piece at the end 
 		 * that doesn't conflict with coreboot 
 		 */
 		if (end > lb_end) {
@@ -301,16 +299,13 @@ static void relocate_segment(unsigned long buffer, struct segment *seg)
 			seg->phdr_next->phdr_prev = new;
 			seg->phdr_next = new;
 
-			/* compute the new value of end */
-			end = start + len;
-			
 			printk_spew("   late: [0x%016lx, 0x%016lx, 0x%016lx)\n", 
 				new->s_dstaddr, 
 				new->s_dstaddr + new->s_filesz,
 				new->s_dstaddr + new->s_memsz);
-			
 		}
 	}
+
 	/* Now retarget this segment onto the bounce buffer */
 	/* sort of explanation: the buffer is a 1:1 mapping to coreboot. 
 	 * so you will make the dstaddr be this buffer, and it will get copied
@@ -332,7 +327,6 @@ static int build_self_segment_list(
 {
 	struct segment *new;
 	struct segment *ptr;
-	int datasize;
 	struct cbfs_payload_segment *segment, *first_segment;
 	memset(head, 0, sizeof(*head));
 	head->phdr_next = head->phdr_prev = head;
@@ -340,66 +334,82 @@ static int build_self_segment_list(
 	first_segment = segment = &payload->segments;
 
 	while(1) {
-		printk_debug("Segment %p\n", segment);
+		printk_debug("Loading segment from rom address 0x%p\n", segment);
 		switch(segment->type) {
-		default: printk_emerg("Bad segment type %x\n", segment->type);
-			return -1;
 		case PAYLOAD_SEGMENT_PARAMS:
-			printk_info("found param section\n");
+			printk_debug("  parameter section (skipped)\n");
 			segment++;
 			continue;
+
 		case PAYLOAD_SEGMENT_CODE:
 		case PAYLOAD_SEGMENT_DATA:
-			printk_info( "%s: ", segment->type == PAYLOAD_SEGMENT_CODE ? 
-				"code" : "data");
-		new = malloc(sizeof(*new));
-		new->s_dstaddr = ntohl((u32) segment->load_addr);
-		new->s_memsz = ntohl(segment->mem_len);
-		new->compression = ntohl(segment->compression);
-
-		datasize = ntohl(segment->len);
-		new->s_srcaddr = (u32) ((unsigned char *) first_segment) + ntohl(segment->offset);
-		new->s_filesz = ntohl(segment->len);
-		printk_debug("New segment dstaddr 0x%lx memsize 0x%lx srcaddr 0x%lx filesize 0x%lx\n",
-			new->s_dstaddr, new->s_memsz, new->s_srcaddr, new->s_filesz);
-		/* Clean up the values */
-		if (new->s_filesz > new->s_memsz)  {
-			new->s_filesz = new->s_memsz;
-		}
-		printk_debug("(cleaned up) New segment addr 0x%lx size 0x%lx offset 0x%lx filesize 0x%lx\n",
-			new->s_dstaddr, new->s_memsz, new->s_srcaddr, new->s_filesz);
-		break;
+			printk_debug("  %s (compression=%x)\n", 
+					segment->type == PAYLOAD_SEGMENT_CODE ?  "code" : "data",
+					ntohl(segment->compression));
+			new = malloc(sizeof(*new));
+			new->s_dstaddr = ntohl((u32) segment->load_addr);
+			new->s_memsz = ntohl(segment->mem_len);
+			new->compression = ntohl(segment->compression);
+
+			new->s_srcaddr = (u32) ((unsigned char *) first_segment) + ntohl(segment->offset);
+			new->s_filesz = ntohl(segment->len);
+			printk_debug("  New segment dstaddr 0x%lx memsize 0x%lx srcaddr 0x%lx filesize 0x%lx\n",
+				new->s_dstaddr, new->s_memsz, new->s_srcaddr, new->s_filesz);
+			/* Clean up the values */
+			if (new->s_filesz > new->s_memsz)  {
+				new->s_filesz = new->s_memsz;
+			}
+			printk_debug("  (cleaned up) New segment addr 0x%lx size 0x%lx offset 0x%lx filesize 0x%lx\n",
+				new->s_dstaddr, new->s_memsz, new->s_srcaddr, new->s_filesz);
+			break;
+
 		case PAYLOAD_SEGMENT_BSS:
-			printk_info("BSS %p/%d\n", (void *) ntohl((u32) segment->load_addr),
+			printk_debug("  BSS 0x%p (%d byte)\n", (void *) ntohl((u32) segment->load_addr),
 				 ntohl(segment->mem_len));
 			new = malloc(sizeof(*new));
 			new->s_filesz = 0;
 			new->s_dstaddr = ntohl((u32) segment->load_addr);
 			new->s_memsz = ntohl(segment->mem_len);
-
 			break;
 
 		case PAYLOAD_SEGMENT_ENTRY:
-			printk_info("Entry %p\n", (void *) ntohl((u32) segment->load_addr));
+			printk_debug("  Entry Point 0x%p\n", (void *) ntohl((u32) segment->load_addr));
 			*entry =  ntohl((u32) segment->load_addr);
+			/* Per definition, a payload always has the entry point
+			 * as last segment. Thus, we use the occurence of the
+			 * entry point as break condition for the loop.
+			 * Can we actually just look at the number of section?
+			 */
 			return 1;
+
+		default:
+			/* We found something that we don't know about. Throw
+			 * hands into the sky and run away!
+			 */
+			printk_emerg("Bad segment type %x\n", segment->type);
+			return -1;
 		}
+
 		segment++;
+
 		for(ptr = head->next; ptr != head; ptr = ptr->next) {
 			if (new->s_srcaddr < ntohl((u32) segment->load_addr))
 				break;
 		}
+
 		/* Order by stream offset */
 		new->next = ptr;
 		new->prev = ptr->prev;
 		ptr->prev->next = new;
 		ptr->prev = new;
+
 		/* Order by original program header order */
 		new->phdr_next = head;
 		new->phdr_prev = head->phdr_prev;
 		head->phdr_prev->phdr_next  = new;
 		head->phdr_prev = new;
 	}
+
 	return 1;
 }
 
@@ -408,10 +418,8 @@ static int load_self_segments(
 	struct lb_memory *mem,
 	struct cbfs_payload *payload)
 {
-	unsigned long offset;
 	struct segment *ptr;
 	
-	offset = 0;
 	unsigned long required_bounce_size = lb_end - lb_start;
 	for(ptr = head->next; ptr != head; ptr = ptr->next) {
 		if (!overlaps_coreboot(ptr)) continue;
@@ -429,7 +437,7 @@ static int load_self_segments(
 			return 0;
 	}
 	for(ptr = head->next; ptr != head; ptr = ptr->next) {
-		unsigned char *dest,*src;
+		unsigned char *dest, *src;
 		printk_debug("Loading Segment: addr: 0x%016lx memsz: 0x%016lx filesz: 0x%016lx\n",
 			ptr->s_dstaddr, ptr->s_memsz, ptr->s_filesz);
 		
diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index f57a14a800..5a8b5f7762 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -59,16 +59,16 @@ struct cbfs_header *cbfs_master_header(void)
 	struct cbfs_header *header;
 
 	void *ptr = (void *)*((unsigned long *) CBFS_HEADPTR_ADDR);
-	printk_debug("Check CBFS header at %p\n", ptr);
+	printk_spew("Check CBFS header at %p\n", ptr);
 	header = (struct cbfs_header *) ptr;
 
-	printk_debug("magic is %08x\n", ntohl(header->magic));
+	printk_spew("magic is %08x\n", ntohl(header->magic));
 	if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
-		printk_err("NO CBFS HEADER\n");
+		printk_err("ERROR: No valid CBFS header found!\n");
 		return NULL;
 	}
 
-	printk_debug("Found CBFS header at %p\n", ptr);
+	printk_spew("Found CBFS header at %p\n", ptr);
 	return header;
 }
 
@@ -86,7 +86,7 @@ struct cbfs_file *cbfs_find(const char *name)
 	while(1) {
 		struct cbfs_file *file = (struct cbfs_file *) offset;
 		if (!cbfs_check_magic(file)) return NULL;
-		printk_info("Check %s\n", CBFS_NAME(file));
+		printk_debug("Check %s\n", CBFS_NAME(file));
 		if (!strcmp(CBFS_NAME(file), name))
 			return file;
 
diff --git a/util/cbfstool/fs.c b/util/cbfstool/fs.c
index 1e4f06907a..611b8fc673 100644
--- a/util/cbfstool/fs.c
+++ b/util/cbfstool/fs.c
@@ -312,6 +312,29 @@ struct cbfs_file *rom_find_next(struct rom *rom, struct cbfs_file *prev)
 			      ntohl(rom->header->align)));
 }
 
+struct cbfs_file *rom_find_empty(struct rom *rom)
+{
+	unsigned int offset = ntohl(rom->header->offset);
+	unsigned int ret = ntohl(rom->header->offset);
+
+	while (offset < rom->fssize) {
+
+		struct cbfs_file *c =
+		    (struct cbfs_file *)ROM_PTR(rom, offset);
+
+		if (!strcmp(c->magic, COMPONENT_MAGIC)) {
+			offset += ALIGN(ntohl(c->offset) + ntohl(c->len),
+					ntohl(rom->header->align));
+
+			ret = offset;
+		} else
+			offset += ntohl(rom->header->align);
+	}
+
+	return (ret < rom->fssize) ?
+	    (struct cbfs_file *)ROM_PTR(rom, ret) : NULL;
+}
+
 struct cbfs_file *rom_find_by_name(struct rom *rom, const char *name)
 {
 	struct cbfs_file *c = rom_find_first(rom);
@@ -363,6 +386,24 @@ int rom_remove(struct rom *rom, const char *name)
 
 	c->type = CBFS_COMPONENT_DELETED; 
 
+	void *n = rom_find_next(rom, c);
+	int clear;
+	
+	if (n != NULL) {
+		memcpy(c, n, rom->fssize - ROM_OFFSET(rom, n));
+		clear = ROM_OFFSET(rom, n) - ROM_OFFSET(rom, c);
+	}
+	else { /* No component after this one. */
+		unsigned int csize;
+		csize = sizeof(struct cbfs_file) + ALIGN(strlen(name) + 1, 16);
+		clear = ntohl(c->len) + csize;
+		memcpy(c, ((void*)c) + clear, 
+		       rom->fssize - (ROM_OFFSET(rom, c)+clear));
+	}
+
+	/* Zero the new space, which is always at the end. */
+	memset(ROM_PTR(rom, rom->fssize - clear), 0, clear);
+
 	return 0;
 }
 
@@ -394,6 +435,7 @@ int rom_extract(struct rom *rom, const char *name, void** buf, int *size )
 int rom_add(struct rom *rom, const char *name, void *buffer, unsigned long address, int size, int type)
 {
 	struct cbfs_file *c;
+	int csize;
 
 	if (rom_find_by_name(rom, name)) {
 		ERROR("Component %s already exists in this rom\n", name);
@@ -410,7 +452,28 @@ int rom_add(struct rom *rom, const char *name, void *buffer, unsigned long addre
 		return -1;
 	}
 
-	memcpy(((unsigned char *)c) + ntohl(c->offset), buffer, size);
+	csize = sizeof(struct cbfs_file) + ALIGN(strlen(name) + 1, 16);
+
+	int offset = ROM_OFFSET(rom, c);
+
+	if (offset + csize + size > rom->fssize) {
+		ERROR("There is not enough room in this ROM for this\n");
+		ERROR("component. I need %d bytes, only have %d bytes avail\n",
+		      csize + size, rom->fssize - offset);
+
+		return -1;
+	}
+
+	strcpy(c->magic, COMPONENT_MAGIC);
+
+	c->len = htonl(size);
+	c->offset = htonl(csize);
+	c->type = htonl(type);
+
+	memset(CBFS_NAME(c), 0, ALIGN(strlen(name) + 1, 16));
+	strcpy((char *)CBFS_NAME(c), name);
+
+	memcpy(((unsigned char *)c) + csize, buffer, size);
 	return 0;
 }