initvga.c File Reference

#include "vgamp.h"
#include "vgavideo.h"

Include dependency graph for initvga.c:

Go to the source code of this file.

Functions
static VOID FASTCALL	vgaSaveRegisters (PVGA_REGISTERS Registers)
static VOID FASTCALL	vgaSetRegisters (PVGA_REGISTERS Registers)
VOID	InitVGAMode (VOID)
VOID	VGAResetDevice (OUT PSTATUS_BLOCK StatusBlock)

Variables
static VGA_REGISTERS	Mode12Regs
VGA_REGISTERS	TextModeRegs

Function Documentation

InitVGAMode()

VOID InitVGAMode

(

VOID

)

Definition at line 110 of file initvga.c.

{
   vgaSaveRegisters(&TextModeRegs);
   vgaSetRegisters(&Mode12Regs);
}

Referenced by VGASetCurrentMode().

VGAResetDevice()

VOID VGAResetDevice

(

OUT PSTATUS_BLOCK

StatusBlock

)

Definition at line 117 of file initvga.c.

{
   vgaSetRegisters(&TextModeRegs);
}

Referenced by VGAStartIO().

vgaSaveRegisters()

static VOID FASTCALL vgaSaveRegisters ( PVGA_REGISTERS  Registers )

static

Definition at line 24 of file initvga.c.

{
   UCHAR i;
 
   for (i = 0; i < sizeof(Registers->CRT); i++)
   {
      VideoPortWritePortUchar(CRTC, i);
      Registers->CRT[i] = VideoPortReadPortUchar(CRTCDATA);
   }
 
   for (i = 0; i < sizeof(Registers->Attribute); i++)
   {
      VideoPortReadPortUchar(STATUS);
      VideoPortWritePortUchar(ATTRIB, i);
      Registers->Attribute[i] = VideoPortReadPortUchar(ATTRIBREAD);
   }
 
   for (i = 0; i < sizeof(Registers->Graphics); i++)
   {
      VideoPortWritePortUchar(GRAPHICS, i);
      Registers->Graphics[i] = VideoPortReadPortUchar(GRAPHICSDATA);
   }
 
   for (i = 0; i < sizeof(Registers->Sequencer); i++)
   {
      VideoPortWritePortUchar(SEQ, i);
      Registers->Sequencer[i] = VideoPortReadPortUchar(SEQDATA);
   }
 
   Registers->Misc = VideoPortReadPortUchar(MISC);
}

Referenced by InitVGAMode().

vgaSetRegisters()

static VOID FASTCALL vgaSetRegisters ( PVGA_REGISTERS  Registers )

static

Definition at line 57 of file initvga.c.

{
   UCHAR i;
 
   /* Update misc output register */
   VideoPortWritePortUchar(MISC, Registers->Misc);
 
   /* Synchronous reset on */
   VideoPortWritePortUchar(SEQ, 0x00);
   VideoPortWritePortUchar(SEQDATA, 0x01);
 
   /* Write sequencer registers */
   for (i = 1; i < sizeof(Registers->Sequencer); i++)
   {
      VideoPortWritePortUchar(SEQ, i);
      VideoPortWritePortUchar(SEQDATA, Registers->Sequencer[i]);
   }
 
   /* Synchronous reset off */
   VideoPortWritePortUchar(SEQ, 0x00);
   VideoPortWritePortUchar(SEQDATA, 0x03);
 
   /* Deprotect CRT registers 0-7 */
   VideoPortWritePortUchar(CRTC, 0x11);
   VideoPortWritePortUchar(CRTCDATA, Registers->CRT[0x11] & 0x7f);
 
   /* Write CRT registers */
   for (i = 0; i < sizeof(Registers->CRT); i++)
   {
      VideoPortWritePortUchar(CRTC, i);
      VideoPortWritePortUchar(CRTCDATA, Registers->CRT[i]);
   }
 
   /* Write graphics controller registers */
   for (i = 0; i < sizeof(Registers->Graphics); i++)
   {
      VideoPortWritePortUchar(GRAPHICS, i);
      VideoPortWritePortUchar(GRAPHICSDATA, Registers->Graphics[i]);
   }
 
   /* Write attribute controller registers */
   for (i = 0; i < sizeof(Registers->Attribute); i++)
   {
      VideoPortReadPortUchar(STATUS);
      VideoPortWritePortUchar(ATTRIB, i);
      VideoPortWritePortUchar(ATTRIB, Registers->Attribute[i]);
   }
 
   /* Renable screen. */
   VideoPortWritePortUchar(ATTRIB, 0x20);
}

Referenced by InitVGAMode(), and VGAResetDevice().

Variable Documentation

Mode12Regs

VGA_REGISTERS Mode12Regs

static

Initial value:

=
{
   
   {0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x59, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3},
   
   {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
    0x0C, 0x0D, 0x0E, 0x0F, 0x81, 0x00, 0x0F, 0x00, 0x00},
   
   {0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x05, 0x0F, 0xFF},
   
   {0x03, 0x01, 0x0F, 0x00, 0x06},
   
   0xE3
}

Definition at line 5 of file initvga.c.

Referenced by InitVGAMode().

TextModeRegs

VGA_REGISTERS TextModeRegs

Definition at line 21 of file initvga.c.

Referenced by InitVGAMode(), and VGAResetDevice().