1 files changed, 82 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/modules/vesainfo.c b/contrib/syslinux-4.02/com32/modules/vesainfo.c
new file mode 100644
index 0000000..00181e4
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/modules/vesainfo.c
@@ -0,0 +1,82 @@
+/*
+ * vesainfo.c
+ *
+ * Dump information about what VESA graphics modes are supported.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <console.h>
+#include <com32.h>
+#include <inttypes.h>
+#include "../lib/sys/vesa/vesa.h"
+
+/* Wait for a keypress */
+static void wait_key(void)
+{
+    char ch;
+    while (fread(&ch, 1, 1, stdin) == 0) ;
+}
+
+static void print_modes(void)
+{
+    static com32sys_t rm;
+    struct vesa_general_info *gi;
+    struct vesa_mode_info *mi;
+    uint16_t mode, *mode_ptr;
+    int lines;
+
+    /* Allocate space in the bounce buffer for these structures */
+    gi = &((struct vesa_info *)__com32.cs_bounce)->gi;
+    mi = &((struct vesa_info *)__com32.cs_bounce)->mi;
+
+    gi->signature = VBE2_MAGIC;	/* Get VBE2 extended data */
+    rm.eax.w[0] = 0x4F00;	/* Get SVGA general information */
+    rm.edi.w[0] = OFFS(gi);
+    rm.es = SEG(gi);
+    __intcall(0x10, &rm, &rm);
+
+    if (rm.eax.w[0] != 0x004F) {
+	printf("No VESA BIOS detected\n");
+	return;
+    } else if (gi->signature != VESA_MAGIC) {
+	printf("VESA information structure has bad magic, trying anyway...\n");
+    }
+
+    printf("VBE version %d.%d\n"
+	   "Mode   attrib h_res v_res bpp layout rpos gpos bpos\n",
+	   (gi->version >> 8) & 0xff, gi->version & 0xff);
+
+    lines = 1;
+
+    mode_ptr = GET_PTR(gi->video_mode_ptr);
+
+    while ((mode = *mode_ptr++) != 0xFFFF) {
+	if (++lines >= 23) {
+	    wait_key();
+	    lines = 0;
+	}
+
+	rm.eax.w[0] = 0x4F01;	/* Get SVGA mode information */
+	rm.ecx.w[0] = mode;
+	rm.edi.w[0] = OFFS(mi);
+	rm.es = SEG(mi);
+	__intcall(0x10, &rm, &rm);
+
+	/* Must be a supported mode */
+	if (rm.eax.w[0] != 0x004f)
+	    continue;
+
+	printf("0x%04x 0x%04x %5u %5u %3u %6u %4u %4u %4u\n",
+	       mode, mi->mode_attr, mi->h_res, mi->v_res, mi->bpp,
+	       mi->memory_layout, mi->rpos, mi->gpos, mi->bpos);
+    }
+}
+
+int main(void)
+{
+    openconsole(&dev_rawcon_r, &dev_stdcon_w);
+
+    print_modes();
+    return 0;
+}