vesacon: make it possible to request nonstandard resolutions

Make it possible to request nonstandard resolutions when enabling
vesacon.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 16 insertions, 1 deletions

diff --git a/com32/include/syslinux/vesacon.h b/com32/include/syslinux/vesacon.h
index dad9fb57..11d72f3a 100644
--- a/com32/include/syslinux/vesacon.h
+++ b/com32/include/syslinux/vesacon.h
@@ -29,6 +29,7 @@
 #define _SYSLINUX_VESACON_H
 
 int vesacon_default_background(void);
+void vesacon_set_resolution(int, int);
 int vesacon_load_background(const char *);
 int vesacon_set_background(unsigned int);
 
diff --git a/com32/lib/sys/vesacon_write.c b/com32/lib/sys/vesacon_write.c
index 49448c6f..e85aba88 100644
--- a/com32/lib/sys/vesacon_write.c
+++ b/com32/lib/sys/vesacon_write.c
@@ -70,6 +70,20 @@ static struct term_info ti = {
    reinitialization. */
 static int vesacon_counter = 0;
 
+static struct {
+    int x, y;
+} vesacon_resolution = {
+    .x = DEFAULT_VESA_X_SIZE,
+    .y = DEFAULT_VESA_Y_SIZE,
+};
+
+/* Set desired resolution - requires a full close/open cycle */
+void vesacon_set_resolution(int x, int y)
+{
+    vesacon_resolution.x = x;
+    vesacon_resolution.y = y;
+}
+
 /* Common setup */
 int __vesacon_open(struct file_info *fp)
 {
@@ -83,7 +97,7 @@ int __vesacon_open(struct file_info *fp)
 	    ti.cols = 80;
 	} else {
 	    /* Switch mode */
-	    if (__vesacon_init(DEFAULT_VESA_X_SIZE, DEFAULT_VESA_Y_SIZE)) {
+	    if (__vesacon_init(vesacon_resolution.x, vesacon_resolution.y)) {
 		vesacon_counter = -1;
 		return EAGAIN;
 	    }