Add a standalone program for parsing VBT.

1 files changed, 163 insertions, 0 deletions

diff --git a/src/bios_reader/bios_reader.c b/src/bios_reader/bios_reader.c
new file mode 100644
index 00000000..a52bcc72
--- /dev/null
+++ b/src/bios_reader/bios_reader.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright © 2006 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#define _PARSE_EDID_
+#include "edid.h"
+
+/* Define some types so we can reuse i830_bios.h */
+typedef void *ScrnInfoPtr;
+typedef int Bool;
+#define TRUE 1
+#define FALSE 0
+#include "../i830_bios.h"
+
+
+/* Make a fake pI830 so we can easily pull i830_bios.c code in here. */
+struct _fake_i830 {
+    CARD8 *VBIOS;
+};
+struct _fake_i830 I830;
+struct _fake_i830 *pI830 = &I830;
+
+#define INTEL_BIOS_8(_addr)	(pI830->VBIOS[_addr])
+#define INTEL_BIOS_16(_addr)	(pI830->VBIOS[_addr] | \
+				 (pI830->VBIOS[_addr + 1] << 8))
+#define INTEL_BIOS_32(_addr)	(pI830->VBIOS[_addr] | \
+				 (pI830->VBIOS[_addr + 1] << 8) \
+				 (pI830->VBIOS[_addr + 2] << 16) \
+				 (pI830->VBIOS[_addr + 3] << 24))
+
+int main(int argc, char **argv)
+{
+    FILE *f;
+    int bios_size = 65536;
+    struct vbt_header *vbt;
+    struct bdb_header *bdb;
+    int vbt_off, bdb_off, bdb_block_off, block_size;
+    int panel_type = -1, i;
+    char *filename = "bios";
+
+    if (argc == 2)
+	filename = argv[1];
+
+    f = fopen(filename, "r");
+    if (!f) {
+	printf("Couldn't open %s\n", filename);
+	return 1;
+    }
+
+    pI830->VBIOS = calloc(1, bios_size);
+    if (fread(pI830->VBIOS, 1, bios_size, f) != bios_size)
+	return 1;
+
+    vbt_off = INTEL_BIOS_16(0x1a);
+    printf("VBT offset: %08x\n", vbt_off);
+    vbt = (struct vbt_header *)(pI830->VBIOS + vbt_off);
+    printf("VBT sig: %20s\n", vbt->signature);
+    printf("VBT vers: %d.%d\n", vbt->version / 100, vbt->version % 100);
+
+    bdb_off = vbt_off + vbt->bdb_offset;
+    bdb = (struct bdb_header *)(pI830->VBIOS + bdb_off);
+    printf("BDB sig: %16s\n", bdb->signature);
+    printf("BDB vers: %d.%d\n", bdb->version / 100, bdb->version % 100);
+    for (bdb_block_off = bdb->header_size; bdb_block_off < bdb->bdb_size;
+	 bdb_block_off += block_size)
+    {
+	int start = bdb_off + bdb_block_off;
+	int id;
+	struct lvds_bdb_1 *lvds1;
+	struct lvds_bdb_2 *lvds2;
+	struct lvds_bdb_2_fp_params *fpparam;
+	struct lvds_bdb_2_fp_edid_dtd *fptiming;
+	CARD8 *timing_ptr;
+
+	id = INTEL_BIOS_8(start);
+	block_size = INTEL_BIOS_16(start + 1) + 3;
+	printf("BDB block type %03d size %d\n", id, block_size);
+	switch (id) {
+	case 40:
+	    lvds1 = (struct lvds_bdb_1 *)(pI830->VBIOS + start);
+	    panel_type = lvds1->panel_type;
+	    printf("Panel type: %d, caps %04x\n", panel_type, lvds1->caps);
+	    break;
+	case 41:
+	    if (panel_type == -1) {
+		printf("Found panel block with no panel type\n");
+		break;
+	    }
+
+	    lvds2 = (struct lvds_bdb_2 *)(pI830->VBIOS + start);
+
+	    printf("Entries per table: %d\n", lvds2->table_size);
+	    for (i = 0; i < 16; i++) {
+		char marker;
+		fpparam = (struct lvds_bdb_2_fp_params *)(pI830->VBIOS +
+		    bdb_off + lvds2->panels[i].fp_params_offset);
+		fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(pI830->VBIOS +
+		    bdb_off + lvds2->panels[i].fp_edid_dtd_offset);
+		timing_ptr = pI830->VBIOS + bdb_off +
+		    lvds2->panels[i].fp_edid_dtd_offset;
+		if (fpparam->terminator != 0xffff) {
+		    /* Apparently the offsets are wrong for some BIOSes, so we
+		     * try the other offsets if we find a bad terminator.
+		     */
+		    fpparam = (struct lvds_bdb_2_fp_params *)(pI830->VBIOS +
+			bdb_off + lvds2->panels[i].fp_params_offset + 8);
+		    fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(pI830->VBIOS +
+			bdb_off + lvds2->panels[i].fp_edid_dtd_offset + 8);
+		    timing_ptr = pI830->VBIOS + bdb_off +
+			lvds2->panels[i].fp_edid_dtd_offset + 8;
+
+		    if (fpparam->terminator != 0xffff)
+			continue;
+		}
+		if (i == panel_type)
+		    marker = '*';
+		else
+		    marker = ' ';
+		printf("%c Panel index %02i xres %d yres %d clock %d\n", marker,
+		       i, fpparam->x_res, fpparam->y_res,
+		       _PIXEL_CLOCK(timing_ptr));
+		printf("        %d %d %d %d %d %d %d %d\n",
+		       _H_ACTIVE(timing_ptr), _H_BLANK(timing_ptr),
+		       _H_SYNC_OFF(timing_ptr), _H_SYNC_WIDTH(timing_ptr),
+		       _V_ACTIVE(timing_ptr), _V_BLANK(timing_ptr),
+		       _V_SYNC_OFF(timing_ptr), _V_SYNC_WIDTH(timing_ptr));
+	    }
+
+	    printf("Panel of size %dx%d\n", fpparam->x_res, fpparam->y_res);
+	    break;
+	}
+    }
+
+    return 0;
+}