Support for VGA bios to clear framebuffer with minimal writes.
Signed-off-by: Ben Guthro <bguthro@xxxxxxxxxxxxxx>
Signed-off-by: Gary Grebus <ggrebus@xxxxxxxxxxxxxxx>
diff -r abca07dac924 tools/firmware/hvmloader/Makefile
--- a/tools/firmware/hvmloader/Makefile Tue Aug 07 09:24:25 2007 -0400
+++ b/tools/firmware/hvmloader/Makefile Tue Aug 07 09:27:14 2007 -0400
@@ -51,10 +51,10 @@ acpi/acpi.a:
acpi/acpi.a:
$(MAKE) -C acpi
-roms.h: ../rombios/BIOS-bochs-latest ../vgabios/VGABIOS-lgpl-latest.bin
../vgabios/VGABIOS-lgpl-latest.cirrus.bin ../vmxassist/vmxassist.bin
../etherboot/eb-rtl8139.zrom.h
+roms.h: ../rombios/BIOS-bochs-latest
../vgabios/VGABIOS-lgpl-latest$(DEBUG_ROM).bin
../vgabios/VGABIOS-lgpl-latest.cirrus$(DEBUG_ROM).bin
../vmxassist/vmxassist.bin ../etherboot/eb-rtl8139.zrom.h
sh ./mkhex rombios ../rombios/BIOS-bochs-latest > roms.h
- sh ./mkhex vgabios_stdvga ../vgabios/VGABIOS-lgpl-latest.bin >> roms.h
- sh ./mkhex vgabios_cirrusvga ../vgabios/VGABIOS-lgpl-latest.cirrus.bin
>> roms.h
+ sh ./mkhex vgabios_stdvga
../vgabios/VGABIOS-lgpl-latest$(DEBUG_ROM).bin >> roms.h
+ sh ./mkhex vgabios_cirrusvga
../vgabios/VGABIOS-lgpl-latest.cirrus$(DEBUG_ROM).bin >> roms.h
sh ./mkhex vmxassist ../vmxassist/vmxassist.bin >> roms.h
cat ../etherboot/eb-rtl8139.zrom.h >> roms.h
diff -r abca07dac924 tools/firmware/vgabios/clext.c
--- a/tools/firmware/vgabios/clext.c Tue Aug 07 09:24:25 2007 -0400
+++ b/tools/firmware/vgabios/clext.c Tue Aug 07 09:24:25 2007 -0400
@@ -1489,19 +1489,31 @@ cirrus_clear_vram_1:
mov dx, #0x3ce
out dx, ax
push ax
- mov cx, #0xa000
- mov es, cx
- xor di, di
+
+;; Windows Vista appears to be emulating this sequence as part of changing
+;; screen resolution, but it generates 4096 writes per iteration.
+;; Instead, use a magic register sequence to write the whole bank.
+;; to avoid
+;;mov cx, #0xa000
+;;mov es, cx
+;;xor di, di
+;;mov ax, si
+;;mov cx, #8192
+;;cld
+;;rep
+;; stosw
mov ax, si
- mov cx, #8192
- cld
- rep
- stosw
+ shl ax, #8
+ mov al, #0xfe
+ out dx, ax ;; Low byte of value to be written to the bank
+ mov ax, si
+ mov al, #0xff
+ out dx, ax ;; High byte and trigger the write
+
pop ax
inc ah
cmp ah, bl
jne cirrus_clear_vram_1
-
pop es
popa
ret
@@ -1628,6 +1640,6 @@ static void cirrus_debugmsg(DI, SI, BP,
Bit16u DI, SI, BP, SP, BX, DX, CX, AX, ES, DS, FLAGS;
{
if((GET_AH()!=0x0E)&&(GET_AH()!=0x02)&&(GET_AH()!=0x09)&&(AX!=0x4F05))
- printf("vgabios call ah%02x al%02x bx%04x cx%04x
dx%04x\n",GET_AH(),GET_AL(),BX,CX,DX);
+ printf("cirrusbios call ah%02x al%02x bx%04x cx%04x
dx%04x\n",GET_AH(),GET_AL(),BX,CX,DX);
}
#endif
diff -r abca07dac924 tools/ioemu/hw/cirrus_vga.c
--- a/tools/ioemu/hw/cirrus_vga.c Tue Aug 07 09:24:25 2007 -0400
+++ b/tools/ioemu/hw/cirrus_vga.c Tue Aug 07 09:24:25 2007 -0400
@@ -294,6 +294,7 @@ void *shared_vram;
static void cirrus_bitblt_reset(CirrusVGAState *s);
static void cirrus_update_memory_access(CirrusVGAState *s);
+static void cirrus_vga_mem_writew(void *opaque, target_phys_addr_t addr,
uint32_t val);
/***************************************
*
@@ -1497,6 +1498,17 @@ cirrus_hook_write_gr(CirrusVGAState * s,
case 0x31: // BLT STATUS/START
cirrus_write_bitblt(s, reg_value);
break;
+
+ // Extension to allow BIOS to clear 16K VRAM bank in one operation
+ case 0xFE:
+ s->gr[reg_index] = reg_value; // Lower byte of value to be written
+ break;
+ case 0xFF: {
+ target_phys_addr_t addr;
+ for (addr = 0xa0000; addr < 0xa4000; addr+=2)
+ cirrus_vga_mem_writew(s, addr, (reg_value << 8) | s->gr[0xFE]);
+ }
+ break;
default:
#ifdef DEBUG_CIRRUS
printf("cirrus: outport gr_index %02x, gr_value %02x\n", reg_index,
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