util/ifdtool: Add option to create FMAP template

On systems that do not provide their own *.fmd (Flashmap) file, we
fall back to a default flashmap file. That file however does not contain
the blobs (ME, GBE ...), that are usually placed below the BIOS Flashmap.
It can therefore easily happen that the placement of the blobs collides
with the placement of the BIOS region (e.g. if CBFS_SIZE is big enough).
The fmaptool can't catch that, since it does not know of the blobs
placement.

This patch basically maps the regions described in the IFD (Intel
Firmware Descriptor) to the default Flashmap.

Test: Build and see that build/fmap.fmd contains all blobs now (on intel
systems that are supported by the ifdtool)

Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: I82cb252fff456773af69943e188480a4998736fd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73487
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

1 files changed, 104 insertions, 4 deletions

diff --git a/util/ifdtool/ifdtool.c b/util/ifdtool/ifdtool.c
index c2dde3c289..625b4cf5ac 100644
--- a/util/ifdtool/ifdtool.c
+++ b/util/ifdtool/ifdtool.c
@@ -331,6 +331,7 @@ static struct region get_region(const struct frba *frba, unsigned int region_typ
 	region.base = (flreg & base_mask) << 12;
 	region.limit = ((flreg & limit_mask) >> 4) | 0xfff;
 	region.size = region.limit - region.base + 1;
+	region.type = region_type;
 
 	if (region.size < 0)
 		region.size = 0;
@@ -995,6 +996,91 @@ static void dump_fd(char *image, int size)
 	}
 }
 
+/* Takes an image containing an IFD and creates a Flashmap .fmd file template.
+ * This flashmap will contain all IFD regions except the BIOS region.
+ * The BIOS region is created by coreboot itself and 'should' match the IFD region
+ * anyway (CONFIG_VALIDATE_INTEL_DESCRIPTOR should make sure). coreboot built system will use
+ * this template to generate the final Flashmap file.
+ */
+static void create_fmap_template(char *image, int size, const char *layout_fname)
+{
+	const struct frba *frba = find_frba(image, size);
+	if (!frba)
+		exit(EXIT_FAILURE);
+
+	int layout_fd = open(layout_fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (layout_fd == -1) {
+		perror("Could not open file");
+		exit(EXIT_FAILURE);
+	}
+
+	char *bbuf = "FLASH@##ROM_BASE## ##ROM_SIZE## {\n";
+	if (write(layout_fd, bbuf, strlen(bbuf)) < 0) {
+		perror("Could not write to file");
+		exit(EXIT_FAILURE);
+	}
+
+	/* fmaptool requires regions in .fmd to be sorted.
+	 * => We need to sort the regions by base address before writing them in .fmd File
+	 */
+	int count_regions = 0;
+	struct region sorted_regions[MAX_REGIONS] = { 0 };
+	for (unsigned int i = 0; i < max_regions; i++) {
+		struct region region = get_region(frba, i);
+		/* is region invalid? */
+		if (region.size < 1)
+			continue;
+
+		/* Here we decide to use the coreboot generated FMAP BIOS region, instead of
+		 * the one specified in the IFD. The case when IFD and FMAP BIOS region do not
+		 * match cannot be caught here, therefore one should still validate IFD and
+		 * FMAP via CONFIG_VALIDATE_INTEL_DESCRIPTOR
+		 */
+		if (i == REGION_BIOS)
+			continue;
+
+		sorted_regions[count_regions] = region;
+		// basically insertion sort
+		for (int i = count_regions-1; i >= 0 ; i--) {
+			if (sorted_regions[i].base > sorted_regions[i+1].base) {
+				struct region tmp = sorted_regions[i];
+				sorted_regions[i] = sorted_regions[i+1];
+				sorted_regions[i+1] = tmp;
+			}
+		}
+		count_regions++;
+	}
+
+	// Now write regions sorted by base address in the fmap file
+	for (int i = 0; i < count_regions; i++) {
+		struct region region = sorted_regions[i];
+		char buf[LAYOUT_LINELEN];
+		snprintf(buf, LAYOUT_LINELEN, "\t%s@0x%X 0x%X\n", region_names[region.type].fmapname, region.base, region.size);
+		if (write(layout_fd, buf, strlen(buf)) < 0) {
+			perror("Could not write to file");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	char *ebuf = "\tSI_BIOS@##BIOS_BASE## ##BIOS_SIZE## {\n"
+		     "\t\t##CONSOLE_ENTRY##\n"
+		     "\t\t##MRC_CACHE_ENTRY##\n"
+		     "\t\t##SMMSTORE_ENTRY##\n"
+		     "\t\t##SPD_CACHE_ENTRY##\n"
+		     "\t\t##VPD_ENTRY##\n"
+		     "\t\tFMAP@##FMAP_BASE## ##FMAP_SIZE##\n"
+		     "\t\tCOREBOOT(CBFS)@##CBFS_BASE## ##CBFS_SIZE##\n"
+		     "\t}\n"
+		     "}\n";
+	if (write(layout_fd, ebuf, strlen(ebuf)) < 0) {
+		perror("Could not write to file");
+		exit(EXIT_FAILURE);
+	}
+
+	close(layout_fd);
+	printf("Wrote layout to %s\n", layout_fname);
+}
+
 static void write_regions(char *image, int size)
 {
 	unsigned int i;
@@ -1689,6 +1775,7 @@ static void print_usage(const char *name)
 	printf("\n"
 	       "   -d | --dump:                          dump intel firmware descriptor\n"
 	       "   -f | --layout <filename>              dump regions into a flashrom layout file\n"
+	       "   -F | --fmap-layout <filename>         dump IFD regions into a fmap layout template (.fmd) file\n"
 	       "   -t | --validate                       Validate that the firmware descriptor layout matches the fmap layout\n"
 	       "   -x | --extract:                       extract intel fd modules\n"
 	       "   -i | --inject <region>:<module>       inject file <module> into region <region>\n"
@@ -1735,7 +1822,7 @@ int main(int argc, char *argv[])
 	int mode_dump = 0, mode_extract = 0, mode_inject = 0, mode_spifreq = 0;
 	int mode_em100 = 0, mode_locked = 0, mode_unlocked = 0, mode_validate = 0;
 	int mode_layout = 0, mode_newlayout = 0, mode_density = 0, mode_setstrap = 0;
-	int mode_read = 0, mode_altmedisable = 0, altmedisable = 0;
+	int mode_read = 0, mode_altmedisable = 0, altmedisable = 0, mode_fmap_template = 0;
 	char *region_type_string = NULL, *region_fname = NULL;
 	const char *layout_fname = NULL;
 	char *new_filename = NULL;
@@ -1748,6 +1835,7 @@ int main(int argc, char *argv[])
 	static const struct option long_options[] = {
 		{"dump", 0, NULL, 'd'},
 		{"layout", 1, NULL, 'f'},
+		{"fmap-template", 1, NULL, 'F'},
 		{"extract", 0, NULL, 'x'},
 		{"inject", 1, NULL, 'i'},
 		{"newlayout", 1, NULL, 'n'},
@@ -1769,7 +1857,7 @@ int main(int argc, char *argv[])
 		{0, 0, 0, 0}
 	};
 
-	while ((opt = getopt_long(argc, argv, "S:V:df:D:C:M:xi:n:O:s:p:elruvth?",
+	while ((opt = getopt_long(argc, argv, "S:V:df:F:D:C:M:xi:n:O:s:p:elruvth?",
 					long_options, &option_index)) != EOF) {
 		switch (opt) {
 		case 'd':
@@ -1791,6 +1879,15 @@ int main(int argc, char *argv[])
 				exit(EXIT_FAILURE);
 			}
 			break;
+		case 'F':
+			mode_fmap_template = 1;
+			layout_fname = strdup(optarg);
+			if (!layout_fname) {
+				fprintf(stderr, "No layout file specified\n");
+				fprintf(stderr, "run '%s -h' for usage\n", argv[0]);
+				exit(EXIT_FAILURE);
+			}
+			break;
 		case 'x':
 			mode_extract = 1;
 			break;
@@ -2013,7 +2110,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if ((mode_dump + mode_layout + mode_extract + mode_inject +
+	if ((mode_dump + mode_layout + mode_fmap_template + mode_extract + mode_inject +
 			mode_setstrap + mode_newlayout + (mode_spifreq | mode_em100 |
 			mode_unlocked | mode_locked) + mode_altmedisable + mode_validate) > 1) {
 		fprintf(stderr, "You may not specify more than one mode.\n\n");
@@ -2021,7 +2118,7 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
-	if ((mode_dump + mode_layout + mode_extract + mode_inject +
+	if ((mode_dump + mode_layout + mode_fmap_template + mode_extract + mode_inject +
 			mode_setstrap + mode_newlayout + mode_spifreq + mode_em100 +
 			mode_locked + mode_unlocked + mode_density + mode_altmedisable + mode_validate) == 0) {
 		fprintf(stderr, "You need to specify a mode.\n\n");
@@ -2086,6 +2183,9 @@ int main(int argc, char *argv[])
 	if (mode_layout)
 		dump_flashrom_layout(image, size, layout_fname);
 
+	if (mode_fmap_template)
+		create_fmap_template(image, size, layout_fname);
+
 	if (mode_extract)
 		write_regions(image, size);