x86: coreboot: Show the option table

Update the cbsysinfo command to show the contents of the CMOS option
table.

While we are here, add some example output for this command, along with
mention of what the unimplemented tags are.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 72 insertions, 1 deletions

diff --git a/cmd/x86/cbsysinfo.c b/cmd/x86/cbsysinfo.c
index 7ca2e13ae2f..ea4d89616f6 100644
--- a/cmd/x86/cbsysinfo.c
+++ b/cmd/x86/cbsysinfo.c
@@ -184,6 +184,77 @@ static const char *timestamp_name(uint32_t id)
 	return "<unknown>";
 }
 
+static void show_option_vals(const struct cb_cmos_option_table *tab,
+			     uint id)
+{
+	const void *ptr, *end;
+	bool found = false;
+
+	end = (void *)tab + tab->size;
+	for (ptr = (void *)tab + tab->header_length; ptr < end;) {
+		const struct cb_record *rec = ptr;
+
+		switch (rec->tag) {
+		case CB_TAG_OPTION_ENUM: {
+			const struct cb_cmos_enums *enums = ptr;
+
+			if (enums->config_id == id) {
+				if (!found)
+					printf("  ");
+				printf(" %d:%s", enums->value, enums->text);
+				found = true;
+			}
+			break;
+		}
+			break;
+		case CB_TAG_OPTION_DEFAULTS:
+		case CB_TAG_OPTION_CHECKSUM:
+		case CB_TAG_OPTION:
+			break;
+		default:
+			printf("tag %x\n", rec->tag);
+			break;
+		}
+		ptr += rec->size;
+	}
+}
+
+static void show_option_table(const struct cb_cmos_option_table *tab)
+{
+	const void *ptr, *end;
+
+	print_ptr("option_table", tab);
+	if (!tab->size)
+		return;
+
+	printf(" Bit  Len  Cfg  ID  Name\n");
+	end = (void *)tab + tab->size;
+	for (ptr = (void *)tab + tab->header_length; ptr < end;) {
+		const struct cb_record *rec = ptr;
+
+		switch (rec->tag) {
+		case CB_TAG_OPTION: {
+			const struct cb_cmos_entries *entry = ptr;
+
+			printf("%4x %4x  %3c %3x  %-20s", entry->bit,
+			       entry->length, entry->config, entry->config_id,
+			       entry->name);
+			show_option_vals(tab, entry->config_id);
+			printf("\n");
+			break;
+		}
+		case CB_TAG_OPTION_ENUM:
+		case CB_TAG_OPTION_DEFAULTS:
+		case CB_TAG_OPTION_CHECKSUM:
+			break;
+		default:
+			printf("tag %x\n", rec->tag);
+			break;
+		}
+		ptr += rec->size;
+	}
+}
+
 static void show_table(struct sysinfo_t *info, bool verbose)
 {
 	struct cb_serial *ser = info->serial;
@@ -218,7 +289,7 @@ static void show_table(struct sysinfo_t *info, bool verbose)
 		printf("%12d: %02x:%-8s %016llx %016llx\n", i, mr->type,
 		       get_mem_name(mr->type), mr->base, mr->size);
 	}
-	print_ptr("option_table", info->option_table);
+	show_option_table(info->option_table);
 
 	print_hex("CMOS start", info->cmos_range_start);
 	if (info->cmos_range_start) {