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

SVN-Revision: 17659

1 files changed, 226 insertions, 0 deletions

diff --git a/package/mtd/src/fis.c b/package/mtd/src/fis.c
new file mode 100644
index 0000000..e774e62
--- /dev/null
+++ b/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;
+}