vgabios: Add VBE power management (10h) stub function.

[seabios.git] / vgasrc / stdvga.c

diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c
index 9c0cba9365d04456ce60697ce12e468afcd1a6da..13334ed47513ef5d3db23b7b6831d1df2ba16c32 100644 (file)
--- a/vgasrc/stdvga.c
+++ b/vgasrc/stdvga.c
@@ -229,20 +229,28 @@ stdvga_get_crtc(void)
     return VGAREG_MDA_CRTC_ADDRESS;
 }
 
-void
-stdvga_set_cursor_shape(u8 start, u8 end)
+// Return the multiplication factor needed for the vga offset register.
+int
+stdvga_bpp_factor(struct vgamode_s *vmode_g)
 {
-    u16 crtc_addr = stdvga_get_crtc();
-    stdvga_crtc_write(crtc_addr, 0x0a, start);
-    stdvga_crtc_write(crtc_addr, 0x0b, end);
+    switch (GET_GLOBAL(vmode_g->memmodel)) {
+    case MM_TEXT:
+        return 2;
+    case MM_CGA:
+        return GET_GLOBAL(vmode_g->depth);
+    case MM_PLANAR:
+        return 1;
+    default:
+        return 4;
+    }
 }
 
 void
-stdvga_set_active_page(u16 address)
+stdvga_set_cursor_shape(u8 start, u8 end)
 {
     u16 crtc_addr = stdvga_get_crtc();
-    stdvga_crtc_write(crtc_addr, 0x0c, address >> 8);
-    stdvga_crtc_write(crtc_addr, 0x0d, address);
+    stdvga_crtc_write(crtc_addr, 0x0a, start);
+    stdvga_crtc_write(crtc_addr, 0x0b, end);
 }
 
 void
@@ -282,6 +290,40 @@ stdvga_set_window(struct vgamode_s *vmode_g, int window, int val)
     return -1;
 }
 
+int
+stdvga_get_linelength(struct vgamode_s *vmode_g)
+{
+    u8 val = stdvga_crtc_read(stdvga_get_crtc(), 0x13);
+    return val * stdvga_bpp_factor(vmode_g) * 2;
+}
+
+int
+stdvga_set_linelength(struct vgamode_s *vmode_g, int val)
+{
+    int factor = stdvga_bpp_factor(vmode_g) * 2;
+    stdvga_crtc_write(stdvga_get_crtc(), 0x13, DIV_ROUND_UP(val, factor));
+    return 0;
+}
+
+int
+stdvga_get_displaystart(struct vgamode_s *vmode_g)
+{
+    u16 crtc_addr = stdvga_get_crtc();
+    int addr = (stdvga_crtc_read(crtc_addr, 0x0c) << 8
+                | stdvga_crtc_read(crtc_addr, 0x0d));
+    return addr * stdvga_bpp_factor(vmode_g);
+}
+
+int
+stdvga_set_displaystart(struct vgamode_s *vmode_g, int val)
+{
+    u16 crtc_addr = stdvga_get_crtc();
+    val /= stdvga_bpp_factor(vmode_g);
+    stdvga_crtc_write(crtc_addr, 0x0c, val >> 8);
+    stdvga_crtc_write(crtc_addr, 0x0d, val);
+    return 0;
+}
+
 
 /****************************************************************
  * Save/Restore/Set state