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| author |   James Morris <jmorris@namei.org> | 2009-05-08 17:56:47 +1000 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-05-08 17:56:47 +1000 |
| commit | d254117099d711f215e62427f55dfb8ebd5ad011 (patch) | |
| tree | 0848ff8dd74314fec14a86497f8d288c86ba7c65 /arch/x86/boot/video-vga.c | |
| parent | integrity: remove __setup auditing msgs (diff) | |
| parent | NOMMU: Don't check vm_region::vm_start is page aligned in add_nommu_region() (diff) | |
| download | linux-dev-d254117099d711f215e62427f55dfb8ebd5ad011.tar.xz linux-dev-d254117099d711f215e62427f55dfb8ebd5ad011.zip | |
Merge branch 'master' into next
Diffstat (limited to 'arch/x86/boot/video-vga.c')
| -rw-r--r-- | arch/x86/boot/video-vga.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c index 5d4742ed4aa2..9e0587a37768 100644 --- a/arch/x86/boot/video-vga.c +++ b/arch/x86/boot/video-vga.c @@ -129,10 +129,10 @@ u16 vga_crtc(void) return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; } -static void vga_set_480_scanlines(int end) +static void vga_set_480_scanlines(void) { - u16 crtc; - u8 csel; + u16 crtc; /* CRTC base address */ + u8 csel; /* CRTC miscellaneous output register */ crtc = vga_crtc(); @@ -140,30 +140,47 @@ static void vga_set_480_scanlines(int end) out_idx(0x0b, crtc, 0x06); /* Vertical total */ out_idx(0x3e, crtc, 0x07); /* Vertical overflow */ out_idx(0xea, crtc, 0x10); /* Vertical sync start */ - out_idx(end, crtc, 0x12); /* Vertical display end */ + out_idx(0xdf, crtc, 0x12); /* Vertical display end */ out_idx(0xe7, crtc, 0x15); /* Vertical blank start */ out_idx(0x04, crtc, 0x16); /* Vertical blank end */ csel = inb(0x3cc); csel &= 0x0d; csel |= 0xe2; - outb(csel, 0x3cc); + outb(csel, 0x3c2); +} + +static void vga_set_vertical_end(int lines) +{ + u16 crtc; /* CRTC base address */ + u8 ovfw; /* CRTC overflow register */ + int end = lines-1; + + crtc = vga_crtc(); + + ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40); + + out_idx(ovfw, crtc, 0x07); /* Vertical overflow */ + out_idx(end, crtc, 0x12); /* Vertical display end */ } static void vga_set_80x30(void) { - vga_set_480_scanlines(0xdf); + vga_set_480_scanlines(); + vga_set_vertical_end(30*16); } static void vga_set_80x34(void) { + vga_set_480_scanlines(); vga_set_14font(); - vga_set_480_scanlines(0xdb); + vga_set_vertical_end(34*14); } static void vga_set_80x60(void) { + vga_set_480_scanlines(); vga_set_8font(); - vga_set_480_scanlines(0xdf); + vga_set_vertical_end(60*8); } static int vga_set_mode(struct mode_info *mode) |