mtd: add support for rewriting the fis table layout on redboot based systems

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17659 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/mtd/Makefile

@@ -12,6 +12,7 @@ PKG_NAME:=mtd
 PKG_RELEASE:=9
 
 PKG_BUILD_DIR := $(KERNEL_BUILD_DIR)/$(PKG_NAME)
+STAMP_PREPARED := $(STAMP_PREPARED)_$(call confvar,CONFIG_MTD_REDBOOT_PARTS)
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -33,12 +34,13 @@ endef
 
 target=$(firstword $(subst -, ,$(BOARD)))
 
-define Build/Compile
-	$(MAKE) -C $(PKG_BUILD_DIR) \
-		$(TARGET_CONFIGURE_OPTS) \
-		TARGET=$(target) \
-		CFLAGS="$(TARGET_CFLAGS) -Dtarget_$(target)=1 -Wall"
-endef
+MAKE_FLAGS += TARGET="$(target)"
+TARGET_CFLAGS += -Dtarget_$(target)=1 -Wall
+
+ifdef CONFIG_MTD_REDBOOT_PARTS
+  MAKE_FLAGS += FIS_SUPPORT=1
+  TARGET_CFLAGS += -DFIS_SUPPORT=1
+endif
 
 define Package/mtd/install
 	$(INSTALL_DIR) $(1)/sbin

package/mtd/src/Makefile

@@ -5,6 +5,10 @@ obj = mtd.o jffs2.o crc32.o
 obj.brcm = trx.o
 obj.brcm47xx = $(obj.brcm)
 
+ifdef FIS_SUPPORT
+  obj += fis.o
+endif
+
 mtd: $(obj) $(obj.$(TARGET))
 clean:
 	rm -f *.o jffs2 

package/mtd/src/fis.c

@@ -0,0 +1,226 @@
+#include <sys/mman.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "crc32.h"
+#include "mtd.h"
+#include "fis.h"
+
+struct fis_image_hdr {
+	unsigned char name[16];
+	uint32_t flash_base;
+	uint32_t mem_base;
+	uint32_t size;
+	uint32_t entry_point;
+	uint32_t data_length;
+} __attribute__((packed));
+
+struct fis_image_crc {
+	uint32_t desc;
+	uint32_t file;
+} __attribute__((packed));
+
+struct fis_image_desc {
+	struct fis_image_hdr hdr;
+	char _pad[256 - sizeof(struct fis_image_hdr) - sizeof(struct fis_image_crc)];
+	struct fis_image_crc crc;
+} __attribute__((packed));
+
+static int fis_fd = -1;
+static struct fis_image_desc *fis_desc;
+static int fis_erasesize = 0;
+
+static void
+fis_close(void)
+{
+	if (fis_desc)
+		munmap(fis_desc, fis_erasesize);
+
+	if (fis_fd >= 0)
+		close(fis_fd);
+
+	fis_fd = -1;
+	fis_desc = NULL;
+}
+
+static struct fis_image_desc *
+fis_open(void)
+{
+	struct fis_image_desc *desc;
+
+	if (fis_fd >= 0)
+		fis_close();
+
+	fis_fd = mtd_check_open("FIS directory");
+	if (fis_fd < 0)
+		goto error;
+
+	close(fis_fd);
+	fis_fd = mtd_open("FIS directory", true);
+	if (fis_fd < 0)
+		goto error;
+
+	fis_erasesize = erasesize;
+	desc = mmap(NULL, erasesize, PROT_READ|PROT_WRITE, MAP_SHARED, fis_fd, 0);
+	if (desc == MAP_FAILED)
+		goto error;
+
+	fis_desc = desc;
+	return desc;
+
+error:
+	fis_close();
+	return NULL;
+}
+
+int
+fis_validate(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
+{
+	struct fis_image_desc *desc;
+	void *end;
+	int found = 0;
+	int i;
+
+	desc = fis_open();
+	if (!desc)
+		return 0;
+
+	for (i = 0; i < n_new - 1; i++) {
+		if (!new[i].size) {
+			fprintf(stderr, "FIS error: only the last partition can detect the size automatically\n");
+			i = -1;
+			goto done;
+		}
+	}
+
+	end = desc;
+	end = (char *) end + fis_erasesize;
+	while ((void *) desc < end) {
+		if (!desc->hdr.name[0] || (desc->hdr.name[0] == 0xff))
+			break;
+
+		for (i = 0; i < n_old; i++) {
+			if (!strncmp((char *) desc->hdr.name, (char *) old[i].name, sizeof(desc->hdr.name))) {
+				found++;
+				goto next;
+			}
+		}
+next:
+		desc++;
+		continue;
+	}
+
+	if (found == n_old)
+		i = 1;
+	else
+		i = -1;
+
+done:
+	fis_close();
+	return i;
+}
+
+int
+fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
+{
+	struct fis_image_desc *fisdir = NULL;
+	struct fis_image_desc *redboot = NULL;
+	struct fis_image_desc *first = NULL;
+	struct fis_image_desc *last = NULL;
+	struct fis_image_desc *desc;
+	struct fis_part *part;
+	uint32_t offset = 0, size = 0;
+	char *end, *tmp;
+	int i;
+
+	desc = fis_open();
+	if (!desc)
+		return -1;
+
+	if (!quiet)
+		fprintf(stderr, "Updating FIS table... \n");
+
+	end = (char *) desc + fis_erasesize;
+	while ((char *) desc < end) {
+		if (!desc->hdr.name[0] || (desc->hdr.name[0] == 0xff))
+			break;
+
+		if (!strcmp((char *) desc->hdr.name, "FIS directory"))
+			fisdir = desc;
+
+		if (!strcmp((char *) desc->hdr.name, "RedBoot"))
+			redboot = desc;
+
+		for (i = 0; i < n_old; i++) {
+			if (!strncmp((char *) desc->hdr.name, (char *) old[i].name, sizeof(desc->hdr.name))) {
+				size += desc->hdr.size;
+				last = desc;
+				if (!first)
+					first = desc;
+				break;
+			}
+		}
+		desc++;
+	}
+	desc--;
+
+	if (desc == last) {
+		desc = fisdir;
+	}
+
+	/* size fixup */
+	if (desc && (last->hdr.flash_base < desc->hdr.flash_base - last->hdr.size))
+			size += (desc->hdr.flash_base - last->hdr.flash_base) - last->hdr.size;
+
+#ifdef notyet
+	desc = first - 1;
+	if (redboot && (desc >= redboot)) {
+		if (first->hdr.flash_base - desc->hdr.size > desc->hdr.flash_base) {
+			int delta = first->hdr.flash_base - desc->hdr.size - desc->hdr.flash_base;
+
+			offset -= delta;
+			size += delta;
+		}
+	}
+#endif
+
+	last++;
+	desc = first + n_new;
+	offset = first->hdr.flash_base;
+
+	if (desc != last) {
+		if (desc > last)
+			tmp = (char *) desc;
+		else
+			tmp = (char *) last;
+
+		memmove(desc, last, end - tmp);
+		if (desc < last) {
+			tmp = end - (last - desc) * sizeof(struct fis_image_desc);
+			memset(tmp, 0xff, tmp - end);
+		}
+	}
+
+	for (part = new, desc = first; desc < first + n_new; desc++, part++) {
+		memset(desc, 0, sizeof(struct fis_image_desc));
+		memcpy(desc->hdr.name, part->name, sizeof(desc->hdr.name));
+		desc->crc.desc = 0;
+		desc->crc.file = 0;
+
+		desc->hdr.flash_base = offset;
+		desc->hdr.mem_base = part->loadaddr;
+		desc->hdr.entry_point = part->loadaddr;
+		desc->hdr.size = (part->size > 0) ? part->size : size;
+		desc->hdr.data_length = desc->hdr.size;
+
+		offset += desc->hdr.size;
+		size -= desc->hdr.size;
+	}
+
+	msync(fis_desc, fis_erasesize, MS_SYNC|MS_INVALIDATE);
+	fis_close();
+
+	return 0;
+}

package/mtd/src/fis.h

@@ -0,0 +1,14 @@
+#ifndef __FIS_H
+#define __FIS_H
+
+struct fis_part {
+	unsigned char name[16];
+	uint32_t offset;
+	uint32_t loadaddr;
+	uint32_t size;
+};
+
+int fis_validate(struct fis_part *old, int n_old, struct fis_part *new, int n_new);
+int fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new);
+
+#endif

package/mtd/src/mtd.c

@@ -43,6 +43,7 @@
 #include <sys/reboot.h>
 #include <linux/reboot.h>
 #include "mtd-api.h"
+#include "fis.h"
 #include "mtd.h"
 
 #define MAX_ARGS 8
@@ -119,10 +120,9 @@ int mtd_erase_block(int fd, int offset)
 	mtdEraseInfo.start = offset;
 	mtdEraseInfo.length = erasesize;
 	ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
-	if (ioctl (fd, MEMERASE, &mtdEraseInfo) < 0) {
-		fprintf(stderr, "Erasing mtd failed.\n");
-		exit(1);
-	}
+	if (ioctl (fd, MEMERASE, &mtdEraseInfo) < 0)
+		return -1;
+
 	return 0;
 }
 
@@ -146,42 +146,78 @@ image_check(int imagefd, const char *mtd)
 
 static int mtd_check(const char *mtd)
 {
+	char *next = NULL;
+	char *str = NULL;
 	int fd;
 
-	fd = mtd_check_open(mtd);
-	if (!fd)
-		return 0;
+	if (strchr(mtd, ':')) {
+		str = strdup(mtd);
+		mtd = str;
+	}
 
-	if (!buf)
-		buf = malloc(erasesize);
+	do {
+		next = strchr(mtd, ':');
+		if (next) {
+			*next = 0;
+			next++;
+		}
+
+		fd = mtd_check_open(mtd);
+		if (!fd)
+			return 0;
+
+		if (!buf)
+			buf = malloc(erasesize);
+
+		close(fd);
+		mtd = next;
+	} while (next);
+
+	if (str)
+		free(str);
 
-	close(fd);
 	return 1;
 }
 
 static int
 mtd_unlock(const char *mtd)
 {
-	int fd;
 	struct erase_info_user mtdLockInfo;
+	char *next = NULL;
+	char *str = NULL;
+	int fd;
 
-	fd = mtd_check_open(mtd);
-	if(fd <= 0) {
-		fprintf(stderr, "Could not open mtd device: %s\n", mtd);
-		exit(1);
+	if (strchr(mtd, ':')) {
+		str = strdup(mtd);
+		mtd = str;
 	}
 
-	if (quiet < 2) 
-		fprintf(stderr, "Unlocking %s ...\n", mtd);
+	do {
+		next = strchr(mtd, ':');
+		if (next) {
+			*next = 0;
+			next++;
+		}
 
-	mtdLockInfo.start = 0;
-	mtdLockInfo.length = mtdsize;
-	if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
+		fd = mtd_check_open(mtd);
+		if(fd <= 0) {
+			fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+			exit(1);
+		}
+
+		if (quiet < 2)
+			fprintf(stderr, "Unlocking %s ...\n", mtd);
+
+		mtdLockInfo.start = 0;
+		mtdLockInfo.length = mtdsize;
+		ioctl(fd, MEMUNLOCK, &mtdLockInfo);
 		close(fd);
-		return 0;
-	}
+		mtd = next;
+	} while (next);
+
+	if (str)
+		free(str);
 
-	close(fd);
 	return 0;
 }
 
@@ -244,10 +280,82 @@ mtd_refresh(const char *mtd)
 }
 
 static int
-mtd_write(int imagefd, const char *mtd)
+mtd_write(int imagefd, const char *mtd, char *fis_layout)
 {
+	char *next = NULL;
+	char *str = NULL;
 	int fd, result;
 	ssize_t r, w, e;
+	uint32_t offset = 0;
+
+#ifdef FIS_SUPPORT
+	static struct fis_part new_parts[MAX_ARGS];
+	static struct fis_part old_parts[MAX_ARGS];
+	int n_new = 0, n_old = 0;
+
+	if (fis_layout) {
+		const char *tmp = mtd;
+		char *word, *brkt;
+		int ret;
+
+		memset(&old_parts, 0, sizeof(old_parts));
+		memset(&new_parts, 0, sizeof(new_parts));
+
+		do {
+			next = strchr(tmp, ':');
+			if (!next)
+				next = (char *) tmp + strlen(tmp);
+
+			memcpy(old_parts[n_old].name, tmp, next - tmp);
+
+			n_old++;
+			tmp = next + 1;
+		} while(*next);
+
+		for (word = strtok_r(fis_layout, ",", &brkt);
+		     word;
+			 word = strtok_r(NULL, ",", &brkt)) {
+
+			tmp = strtok(word, ":");
+			strncpy((char *) new_parts[n_new].name, tmp, sizeof(new_parts[n_new].name) - 1);
+
+			tmp = strtok(NULL, ":");
+			if (!tmp)
+				goto next;
+
+			new_parts[n_new].size = strtoul(tmp, NULL, 0);
+
+			tmp = strtok(NULL, ":");
+			if (!tmp)
+				goto next;
+
+			new_parts[n_new].loadaddr = strtoul(tmp, NULL, 16);
+next:
+			n_new++;
+		}
+		ret = fis_validate(old_parts, n_old, new_parts, n_new);
+		if (ret < 0) {
+			fprintf(stderr, "Failed to validate the new FIS partition table\n");
+			exit(1);
+		}
+		if (ret == 0)
+			fis_layout = NULL;
+	}
+#endif
+
+	if (strchr(mtd, ':')) {
+		str = strdup(mtd);
+		mtd = str;
+	}
+
+	r = 0;
+
+resume:
+	next = strchr(mtd, ':');
+	if (next) {
+		*next = 0;
+		next++;
+	}
 
 	fd = mtd_check_open(mtd);
 	if(fd < 0) {
@@ -258,13 +366,13 @@ mtd_write(int imagefd, const char *mtd)
 	if (quiet < 2)
 		fprintf(stderr, "Writing from %s to %s ... ", imagefile, mtd);
 
-	r = w = e = 0;
+	w = e = 0;
 	if (!quiet)
 		fprintf(stderr, " [ ]");
 
 	for (;;) {
-		/* buffer may contain data already (from trx check) */
-		do {
+		/* buffer may contain data already (from trx check or last mtd partition write attempt) */
+		while (buflen < erasesize) {
 			r = read(imagefd, buf + buflen, erasesize - buflen);
 			if (r < 0) {
 				if ((errno == EINTR) || (errno == EAGAIN))
@@ -279,7 +387,7 @@ mtd_write(int imagefd, const char *mtd)
 				break;
 
 			buflen += r;
-		} while (buflen < erasesize);
+		}
 
 		if (buflen == 0)
 			break;
@@ -304,7 +412,24 @@ mtd_write(int imagefd, const char *mtd)
 			if (!quiet)
 				fprintf(stderr, "\b\b\b[e]");
 
-			mtd_erase_block(fd, e);
+
+			if (mtd_erase_block(fd, e) < 0) {
+				if (next) {
+					if (w < e) {
+						write(fd, buf + offset, e - w);
+						offset = e - w;
+					}
+					w = 0;
+					e = 0;
+					close(fd);
+					mtd = next;
+					fprintf(stderr, "\b\b\b   \n");
+					goto resume;
+				} else {
+					fprintf(stderr, "Failed to erase block\n");
+					exit(1);
+				}
+			}
 
 			/* erase the chunk */
 			e += erasesize;
@@ -313,7 +438,7 @@ mtd_write(int imagefd, const char *mtd)
 		if (!quiet)
 			fprintf(stderr, "\b\b\b[w]");
 
-		if ((result = write(fd, buf, buflen)) < buflen) {
+		if ((result = write(fd, buf + offset, buflen)) < buflen) {
 			if (result < 0) {
 				fprintf(stderr, "Error writing image.\n");
 				exit(1);
@@ -325,21 +450,30 @@ mtd_write(int imagefd, const char *mtd)
 		w += buflen;
 
 		buflen = 0;
+		offset = 0;
 	}
+
 	if (!quiet)
-		fprintf(stderr, "\b\b\b\b");
+		fprintf(stderr, "\b\b\b\b    ");
 
 done:
 	if (quiet < 2)
 		fprintf(stderr, "\n");
 
+#ifdef FIS_SUPPORT
+	if (fis_layout) {
+		if (fis_remap(old_parts, n_old, new_parts, n_new) < 0)
+			fprintf(stderr, "Failed to update the FIS partition table\n");
+	}
+#endif
+
 	close(fd);
 	return 0;
 }
 
 static void usage(void)
 {
-	fprintf(stderr, "Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
+	fprintf(stderr, "Usage: mtd [<options> ...] <command> [<arguments> ...] <device>[:<device>...]\n\n"
 	"The device is in the format of mtdX (eg: mtd4) or its label.\n"
 	"mtd recognizes these commands:\n"
 	"        unlock                  unlock the device\n"
@@ -355,6 +489,12 @@ static void usage(void)
 	"        -e <device>             erase <device> before executing the command\n"
 	"        -d <name>               directory for jffs2write, defaults to \"tmp\"\n"
 	"        -j <name>               integrate <file> into jffs2 data when writing an image\n"
+#ifdef FIS_SUPPORT
+	"        -F <part>[:<size>[:<entrypoint>]][,<part>...]\n"
+	"                                alter the fis partition table to create new partitions replacing\n"
+	"                                the partitions provided as argument to the write command\n"
+	"                                (only valid together with the write command)\n"
+#endif
 	"\n"
 	"Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
 	"         mtd -r write linux.trx linux\n\n");
@@ -378,6 +518,7 @@ int main (int argc, char **argv)
 {
 	int ch, i, boot, imagefd = 0, force, unlocked;
 	char *erase[MAX_ARGS], *device = NULL;
+	char *fis_layout = NULL;
 	enum {
 		CMD_ERASE,
 		CMD_WRITE,
@@ -392,7 +533,11 @@ int main (int argc, char **argv)
 	buflen = 0;
 	quiet = 0;
 
-	while ((ch = getopt(argc, argv, "frqe:d:j:")) != -1)
+	while ((ch = getopt(argc, argv,
+#ifdef FIS_SUPPORT
+			"F:"
+#endif
+			"frqe:d:j:")) != -1)
 		switch (ch) {
 			case 'f':
 				force = 1;
@@ -417,6 +562,11 @@ int main (int argc, char **argv)
 			case 'd':
 				jffs2dir = optarg;
 				break;
+#ifdef FIS_SUPPORT
+			case 'F':
+				fis_layout = optarg;
+				break;
+#endif
 			case '?':
 			default:
 				usage();
@@ -485,7 +635,6 @@ int main (int argc, char **argv)
 		i++;
 	}
 
-		
 	switch (cmd) {
 		case CMD_UNLOCK:
 			if (!unlocked)
@@ -499,7 +648,7 @@ int main (int argc, char **argv)
 		case CMD_WRITE:
 			if (!unlocked)
 				mtd_unlock(device);
-			mtd_write(imagefd, device);
+			mtd_write(imagefd, device, fis_layout);
 			break;
 		case CMD_JFFS2WRITE:
 			if (!unlocked)