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-rw-r--r--drivers/video/console/vgacon.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index bcf59b28a14..d27fa91e588 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -95,6 +95,7 @@ static unsigned long vgacon_uni_pagedir[2];
/* Description of the hardware situation */
static unsigned long vga_vram_base; /* Base of video memory */
static unsigned long vga_vram_end; /* End of video memory */
+static int vga_vram_size; /* Size of video memory */
static u16 vga_video_port_reg; /* Video register select port */
static u16 vga_video_port_val; /* Video register value port */
static unsigned int vga_video_num_columns; /* Number of text columns */
@@ -288,6 +289,7 @@ static const char __init *vgacon_startup(void)
vga_vram_base = VGA_MAP_MEM(vga_vram_base);
vga_vram_end = VGA_MAP_MEM(vga_vram_end);
+ vga_vram_size = vga_vram_end - vga_vram_base;
/*
* Find out if there is a graphics card present.
@@ -504,9 +506,13 @@ static int vgacon_switch(struct vc_data *c)
*/
vga_video_num_columns = c->vc_cols;
vga_video_num_lines = c->vc_rows;
+
+ /* We can only copy out the size of the video buffer here,
+ * otherwise we get into VGA BIOS */
+
if (!vga_is_gfx)
scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
- c->vc_screenbuf_size);
+ c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
return 0; /* Redrawing not needed */
}
@@ -961,7 +967,6 @@ static int vgacon_scrolldelta(struct vc_data *c, int lines)
if (!lines) /* Turn scrollback off */
c->vc_visible_origin = c->vc_origin;
else {
- int vram_size = vga_vram_end - vga_vram_base;
int margin = c->vc_size_row * 4;
int ul, we, p, st;
@@ -971,7 +976,7 @@ static int vgacon_scrolldelta(struct vc_data *c, int lines)
we = vga_rolled_over + c->vc_size_row;
} else {
ul = 0;
- we = vram_size;
+ we = vga_vram_size;
}
p = (c->vc_visible_origin - vga_vram_base - ul + we) % we +
lines * c->vc_size_row;
@@ -1012,9 +1017,13 @@ static void vgacon_save_screen(struct vc_data *c)
c->vc_x = ORIG_X;
c->vc_y = ORIG_Y;
}
+
+ /* We can't copy in more then the size of the video buffer,
+ * or we'll be copying in VGA BIOS */
+
if (!vga_is_gfx)
scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,
- c->vc_screenbuf_size);
+ c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
}
static int vgacon_scroll(struct vc_data *c, int t, int b, int dir,