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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c')
-rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c | 377 |
1 files changed, 0 insertions, 377 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c b/board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c deleted file mode 100644 index 8056e9a..0000000 --- a/board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c +++ /dev/null @@ -1,377 +0,0 @@ -/**************************************************************************** -* -* SciTech OS Portability Manager Library -* -* ======================================================================== -* -* The contents of this file are subject to the SciTech MGL Public -* License Version 1.0 (the "License"); you may not use this file -* except in compliance with the License. You may obtain a copy of -* the License at http://www.scitechsoft.com/mgl-license.txt -* -* Software distributed under the License is distributed on an -* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or -* implied. See the License for the specific language governing -* rights and limitations under the License. -* -* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. -* -* The Initial Developer of the Original Code is SciTech Software, Inc. -* All Rights Reserved. -* -* ======================================================================== -* -* Portions copyright (C) Josh Vanderhoof -* -* Language: ANSI C -* Environment: Any -* -* Description: Functions to save and restore the VGA hardware state. -* -****************************************************************************/ - -#include "pmapi.h" -#if defined(__WIN32_VXD__) || defined(__NT_DRIVER__) -#include "sdd/sddhelp.h" -#else -#include <string.h> -#endif - -/*--------------------------- Global variables ----------------------------*/ - -/* VGA index register ports */ -#define CRT_I 0x3D4 /* CRT Controller Index */ -#define ATT_IW 0x3C0 /* Attribute Controller Index & Data */ -#define GRA_I 0x3CE /* Graphics Controller Index */ -#define SEQ_I 0x3C4 /* Sequencer Index */ - -/* VGA data register ports */ -#define CRT_D 0x3D5 /* CRT Controller Data Register */ -#define ATT_R 0x3C1 /* Attribute Controller Data Read Register */ -#define GRA_D 0x3CF /* Graphics Controller Data Register */ -#define SEQ_D 0x3C5 /* Sequencer Data Register */ -#define MIS_R 0x3CC /* Misc Output Read Register */ -#define MIS_W 0x3C2 /* Misc Output Write Register */ -#define IS1_R 0x3DA /* Input Status Register 1 */ -#define PEL_IW 0x3C8 /* PEL Write Index */ -#define PEL_IR 0x3C7 /* PEL Read Index */ -#define PEL_D 0x3C9 /* PEL Data Register */ - -/* standard VGA indexes max counts */ -#define CRT_C 24 /* 24 CRT Controller Registers */ -#define ATT_C 21 /* 21 Attribute Controller Registers */ -#define GRA_C 9 /* 9 Graphics Controller Registers */ -#define SEQ_C 5 /* 5 Sequencer Registers */ -#define MIS_C 1 /* 1 Misc Output Register */ -#define PAL_C 768 /* 768 Palette Registers */ -#define FONT_C 8192 /* Total size of character generator RAM */ - -/* VGA registers saving indexes */ -#define CRT 0 /* CRT Controller Registers start */ -#define ATT (CRT+CRT_C) /* Attribute Controller Registers start */ -#define GRA (ATT+ATT_C) /* Graphics Controller Registers start */ -#define SEQ (GRA+GRA_C) /* Sequencer Registers */ -#define MIS (SEQ+SEQ_C) /* General Registers */ -#define PAL (MIS+MIS_C) /* VGA Palette Registers */ -#define FONT (PAL+PAL_C) /* VGA font data */ - -/* Macros for port I/O with arguments reversed */ - -#define _port_out(v,p) PM_outpb(p,(uchar)(v)) -#define _port_in(p) PM_inpb(p) - -/*----------------------------- Implementation ----------------------------*/ - -/**************************************************************************** -REMARKS: -Returns the size of the VGA state buffer. -****************************************************************************/ -int PMAPI PM_getVGAStateSize(void) -{ - return CRT_C + ATT_C + GRA_C + SEQ_C + MIS_C + PAL_C + FONT_C; -} - -/**************************************************************************** -REMARKS: -Delay for a short period of time. -****************************************************************************/ -static void vga_delay(void) -{ - int i; - - /* For the loop here we program the POST register. The length of this - * delay is dependant only on ISA bus speed, but it is enough for - * what we need. - */ - for (i = 0; i <= 10; i++) - PM_outpb(0x80, 0); -} - -/**************************************************************************** -PARAMETERS: -port - I/O port to read value from -index - Port index to read - -RETURNS: -Byte read from 'port' register 'index'. -****************************************************************************/ -static ushort vga_rdinx( - ushort port, - ushort index) -{ - PM_outpb(port,(uchar)index); - return PM_inpb(port+1); -} - -/**************************************************************************** -PARAMETERS: -port - I/O port to write to -index - Port index to write -value - Byte to write to port - -REMARKS: -Writes a byte value to the 'port' register 'index'. -****************************************************************************/ -static void vga_wrinx( - ushort port, - ushort index, - ushort value) -{ - PM_outpb(port,(uchar)index); - PM_outpb(port+1,(uchar)value); -} - -/**************************************************************************** -REMARKS: -Save the color palette values -****************************************************************************/ -static void vga_savepalette( - uchar *pal) -{ - int i; - - _port_out(0, PEL_IR); - for (i = 0; i < 768; i++) { - vga_delay(); - *pal++ = _port_in(PEL_D); - } -} - -/**************************************************************************** -REMARKS: -Restore the color palette values -****************************************************************************/ -static void vga_restorepalette( - const uchar *pal) -{ - int i; - - /* restore saved palette */ - _port_out(0, PEL_IW); - for (i = 0; i < 768; i++) { - vga_delay(); - _port_out(*pal++, PEL_D); - } -} - -/**************************************************************************** -REMARKS: -Read the font data from the VGA character generator RAM -****************************************************************************/ -static void vga_saveFont( - uchar *data) -{ - uchar *A0000Ptr = PM_getA0000Pointer(); - uchar save[7]; - - /* Enable access to character generator RAM */ - save[0] = (uchar)vga_rdinx(SEQ_I,0x00); - save[1] = (uchar)vga_rdinx(SEQ_I,0x02); - save[2] = (uchar)vga_rdinx(SEQ_I,0x04); - save[3] = (uchar)vga_rdinx(SEQ_I,0x00); - save[4] = (uchar)vga_rdinx(GRA_I,0x04); - save[5] = (uchar)vga_rdinx(GRA_I,0x05); - save[6] = (uchar)vga_rdinx(GRA_I,0x06); - vga_wrinx(SEQ_I,0x00,0x01); - vga_wrinx(SEQ_I,0x02,0x04); - vga_wrinx(SEQ_I,0x04,0x07); - vga_wrinx(SEQ_I,0x00,0x03); - vga_wrinx(GRA_I,0x04,0x02); - vga_wrinx(GRA_I,0x05,0x00); - vga_wrinx(GRA_I,0x06,0x00); - - /* Copy character generator RAM */ - memcpy(data,A0000Ptr,FONT_C); - - /* Restore VGA state */ - vga_wrinx(SEQ_I,0x00,save[0]); - vga_wrinx(SEQ_I,0x02,save[1]); - vga_wrinx(SEQ_I,0x04,save[2]); - vga_wrinx(SEQ_I,0x00,save[3]); - vga_wrinx(GRA_I,0x04,save[4]); - vga_wrinx(GRA_I,0x05,save[5]); - vga_wrinx(GRA_I,0x06,save[6]); -} - -/**************************************************************************** -REMARKS: -Downloads the font data to the VGA character generator RAM -****************************************************************************/ -static void vga_restoreFont( - const uchar *data) -{ - uchar *A0000Ptr = PM_getA0000Pointer(); - - /* Enable access to character generator RAM */ - vga_wrinx(SEQ_I,0x00,0x01); - vga_wrinx(SEQ_I,0x02,0x04); - vga_wrinx(SEQ_I,0x04,0x07); - vga_wrinx(SEQ_I,0x00,0x03); - vga_wrinx(GRA_I,0x04,0x02); - vga_wrinx(GRA_I,0x05,0x00); - vga_wrinx(GRA_I,0x06,0x00); - - /* Copy font back to character generator RAM */ - memcpy(A0000Ptr,data,FONT_C); -} - -/**************************************************************************** -REMARKS: -Save the state of all VGA compatible registers -****************************************************************************/ -void PMAPI PM_saveVGAState( - void *stateBuf) -{ - uchar *regs = stateBuf; - int i; - - /* Save state of VGA registers */ - for (i = 0; i < CRT_C; i++) { - _port_out(i, CRT_I); - regs[CRT + i] = _port_in(CRT_D); - } - for (i = 0; i < ATT_C; i++) { - _port_in(IS1_R); - vga_delay(); - _port_out(i, ATT_IW); - vga_delay(); - regs[ATT + i] = _port_in(ATT_R); - vga_delay(); - } - for (i = 0; i < GRA_C; i++) { - _port_out(i, GRA_I); - regs[GRA + i] = _port_in(GRA_D); - } - for (i = 0; i < SEQ_C; i++) { - _port_out(i, SEQ_I); - regs[SEQ + i] = _port_in(SEQ_D); - } - regs[MIS] = _port_in(MIS_R); - - /* Save the VGA palette values */ - vga_savepalette(®s[PAL]); - - /* Save the VGA character generator RAM */ - vga_saveFont(®s[FONT]); - - /* Turn the VGA display back on */ - PM_vgaUnblankDisplay(); -} - -/**************************************************************************** -REMARKS: -Retore the state of all VGA compatible registers -****************************************************************************/ -void PMAPI PM_restoreVGAState( - const void *stateBuf) -{ - const uchar *regs = stateBuf; - int i; - - /* Blank the display before we start the restore */ - PM_vgaBlankDisplay(); - - /* Restore the VGA character generator RAM */ - vga_restoreFont(®s[FONT]); - - /* Restore the VGA palette values */ - vga_restorepalette(®s[PAL]); - - /* Restore the state of the VGA compatible registers */ - _port_out(regs[MIS], MIS_W); - - /* Delay to allow clock change to settle */ - for (i = 0; i < 10; i++) - vga_delay(); - - /* Synchronous reset on */ - _port_out(0x00,SEQ_I); - _port_out(0x01,SEQ_D); - - /* Write seqeuencer registers */ - _port_out(1, SEQ_I); - _port_out(regs[SEQ + 1] | 0x20, SEQ_D); - for (i = 2; i < SEQ_C; i++) { - _port_out(i, SEQ_I); - _port_out(regs[SEQ + i], SEQ_D); - } - - /* Synchronous reset off */ - _port_out(0x00,SEQ_I); - _port_out(0x03,SEQ_D); - - /* Deprotect CRT registers 0-7 and write CRTC */ - _port_out(0x11, CRT_I); - _port_out(_port_in(CRT_D) & 0x7F, CRT_D); - for (i = 0; i < CRT_C; i++) { - _port_out(i, CRT_I); - _port_out(regs[CRT + i], CRT_D); - } - for (i = 0; i < GRA_C; i++) { - _port_out(i, GRA_I); - _port_out(regs[GRA + i], GRA_D); - } - for (i = 0; i < ATT_C; i++) { - _port_in(IS1_R); /* reset flip-flop */ - vga_delay(); - _port_out(i, ATT_IW); - vga_delay(); - _port_out(regs[ATT + i], ATT_IW); - vga_delay(); - } - - /* Ensure the VGA screen is turned on */ - PM_vgaUnblankDisplay(); -} - -/**************************************************************************** -REMARKS: -Disables the VGA display for screen output making it blank. -****************************************************************************/ -void PMAPI PM_vgaBlankDisplay(void) -{ - /* Turn screen off */ - _port_out(0x01, SEQ_I); - _port_out(_port_in(SEQ_D) | 0x20, SEQ_D); - - /* Disable video output */ - _port_in(IS1_R); - vga_delay(); - _port_out(0x00, ATT_IW); -} - -/**************************************************************************** -REMARKS: -Enables the VGA display for screen output. -****************************************************************************/ -void PMAPI PM_vgaUnblankDisplay(void) -{ - /* Turn screen back on */ - _port_out(0x01, SEQ_I); - _port_out(_port_in(SEQ_D) & 0xDF, SEQ_D); - - /* Enable video output */ - _port_in(IS1_R); - vga_delay(); - _port_out(0x20, ATT_IW); -} |