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>

3 files changed, 178 insertions, 1 deletions

diff --git a/cmd/x86/cbsysinfo.c b/cmd/x86/cbsysinfo.c
index 84822a3..8c46203 100644
--- a/cmd/x86/cbsysinfo.c
+++ b/cmd/x86/cbsysinfo.c
@@ -185,6 +185,77 @@ 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;
@@ -219,7 +290,7 @@ 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) {
diff --git a/doc/usage/cmd/cbsysinfo.rst b/doc/usage/cmd/cbsysinfo.rst
index 80d8ba1..28f61d9 100644
--- a/doc/usage/cmd/cbsysinfo.rst
+++ b/doc/usage/cmd/cbsysinfo.rst
@@ -23,3 +23,102 @@ Example
 ::
 
     => cbsysinfo
+    Coreboot table at 500, size 5c4, records 1d (dec 29), decoded to 000000007dce4520, forwarded to 000000007ff9a000
+
+    CPU KHz     : 0
+    Serial I/O port: 00000000
+       base        : 00000000
+       pointer     : 000000007ff9a370
+       type        : 1
+       base        : 000003f8
+       baud        : 0d115200
+       regwidth    : 1
+       input_hz    : 0d1843200
+       PCI addr    : 00000010
+    Mem ranges  : 7
+              id: type               ||   base        ||   size
+               0: 10:table    0000000000000000 0000000000001000
+               1: 01:ram      0000000000001000 000000000009f000
+               2: 02:reserved 00000000000a0000 0000000000060000
+               3: 01:ram      0000000000100000 000000007fe6d000
+               4: 10:table    000000007ff6d000 0000000000093000
+               5: 02:reserved 00000000fec00000 0000000000001000
+               6: 02:reserved 00000000ff800000 0000000000800000
+    option_table: 000000007ff9a018
+     Bit  Len  Cfg  ID  Name
+       0  180    r   0  reserved_memory
+     180    1    e   4  boot_option            0:Fallback 1:Normal
+     184    4    h   0  reboot_counter
+     190    8    r   0  reserved_century
+     1b8    8    r   0  reserved_ibm_ps2_century
+     1c0    1    e   1  power_on_after_fail    0:Disable 1:Enable
+     1c4    4    e   6  debug_level            5:Notice 6:Info 7:Debug 8:Spew
+     1d0   80    r   0  vbnv
+     3f0   10    h   0  check_sum
+    CMOS start  : 1c0
+       CMOS end    : 1cf
+       CMOS csum loc: 3f0
+    VBNV start  : ffffffff
+    VBNV size   : ffffffff
+    CB version  : 4.21-5-g7e6eae9679e3-dirty
+       Extra       :
+       Build       : Thu Sep 07 14:52:41 UTC 2023
+       Time        : 14:52:41
+    Framebuffer : 000000007ff9a410
+       Phys addr   :         fd000000
+       X res       : 0d800
+       X res       : 0d600
+       Bytes / line: c80
+       Bpp         : 0d32
+       pos/size      red 16/8, green 8/8, blue 0/8, reserved 24/8
+    GPIOs       : 0
+              id: port     polarity val name
+    MACs        : 0d10
+               0: 12:00:00:00:28:00
+               1: 00:00:00:fd:00:00
+               2: 20:03:00:00:58:02
+               3: 80:0c:00:00:20:10
+               4: 08:00:08:18:08:00
+               5: 16:00:00:00:10:00
+               6: 00:d0:fd:7f:00:00
+               7: 17:00:00:00:10:00
+               8: 00:e0:fd:7f:00:00
+               9: 37:00:00:00:10:00
+    Multiboot tab: 0000000000000000
+    CB header   : 000000007ff9a000
+    CB mainboard: 000000007ff9a344
+       vendor      : 0: Emulation
+       part_number : 10: QEMU x86 i440fx/piix4
+    vboot handoff: 0000000000000000
+       size        : 0
+       vdat addr   : 0000000000000000
+       size        : 0
+    SMBIOS      :         7ff6d000
+       size        : 8000
+    ROM MTRR    : 0
+    Tstamp table: 000000007ffdd000
+    CBmem cons  : 000000007ffde000
+    Size        : 1fff8
+    Cursor      : 3332
+    MRC cache   : 0000000000000000
+    ACPI GNVS   : 0000000000000000
+    Board ID    : ffffffff
+    RAM code    : ffffffff
+    WiFi calib  : 0000000000000000
+    Ramoops buff:                0
+       size        : 0
+    SF size     : 0
+    SF sector   : 0
+    SF erase cmd: 0
+    FMAP offset :                0
+    CBFS offset :              200
+    CBFS size   :           3ffe00
+    Boot media size:           400000
+    MTC start   :                0
+    MTC size    : 0
+    Chrome OS VPD: 0000000000000000
+    RSDP        : 000000007ff75000
+    Unimpl.     : 10 37 40
+    =>
+
+Note that "Unimpl." shows tags which U-Boot does not currently implement.
diff --git a/test/cmd/coreboot.c b/test/cmd/coreboot.c
index 054fe2d..1feca1e 100644
--- a/test/cmd/coreboot.c
+++ b/test/cmd/coreboot.c
@@ -22,6 +22,13 @@ static int test_cmd_cbsysinfo(struct unit_test_state *uts)
 	ut_assertok(run_command("cbsysinfo", 0));
 	ut_assert_nextlinen("Coreboot table at");
 
+	/* Make sure CMOS options are enabled */
+	ut_assert_skip_to_line(
+		" 1c0    1    e   1  power_on_after_fail    0:Disable 1:Enable");
+	ut_assert_skip_to_line("CMOS start  : 1c0");
+	ut_assert_nextline("   CMOS end    : 1cf");
+	ut_assert_nextline("   CMOS csum loc: 3f0");
+
 	/* Make sure the linear frame buffer is enabled */
 	ut_assert_skip_to_linen("Framebuffer");
 	ut_assert_nextlinen("   Phys addr");