96 lines
1.5 KiB
C
96 lines
1.5 KiB
C
/*++
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Copyright (c) 1993 Weitek Corporation
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Module Name:
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vga.c
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Abstract:
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This module contains VGA specific functions for the Weitek P9
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miniport device driver.
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Environment:
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Kernel mode
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Revision History may be found at the end of this file.
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--*/
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#include "p9.h"
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#include "p9gbl.h"
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#include "vga.h"
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VOID
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LockVGARegs(
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PHW_DEVICE_EXTENSION HwDeviceExtension
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)
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/*++
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Routine Description:
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Arguments:
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HwDeviceExtension - Pointer to the miniport driver's device extension.
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pPal - Pointer to the array of pallete entries.
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StartIndex - Specifies the first pallete entry provided in pPal.
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Count - Number of palette entries in pPal
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Return Value:
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None.
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--*/
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{
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//
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// *** Don't lock it for ease of debug ***
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//
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// VGA_WR_REG(SEQ_INDEX_PORT, SEQ_MISC_INDEX);
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// VGA_WR_REG(SEQ_DATA_PORT, VGA_RD_REG(SEQ_DATA_PORT) | SEQ_MISC_CRLOCK);
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return;
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}
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VOID
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UnlockVGARegs(
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PHW_DEVICE_EXTENSION HwDeviceExtension
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)
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/*++
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Routine Description:
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Arguments:
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HwDeviceExtension - Pointer to the miniport driver's device extension.
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pPal - Pointer to the array of pallete entries.
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StartIndex - Specifies the first pallete entry provided in pPal.
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Count - Number of palette entries in pPal
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Return Value:
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None.
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--*/
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{
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USHORT holdit;
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VGA_WR_REG(SEQ_INDEX_PORT, SEQ_MISC_INDEX);
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holdit = VGA_RD_REG(SEQ_DATA_PORT);
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VGA_WR_REG(SEQ_DATA_PORT, holdit);
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VGA_WR_REG(SEQ_DATA_PORT, holdit);
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holdit = VGA_RD_REG(SEQ_DATA_PORT);
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VGA_WR_REG(SEQ_DATA_PORT, holdit & ~(SEQ_MISC_CRLOCK));
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return;
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}
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