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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, 377 insertions, 0 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 new file mode 100644 index 0000000000..3be14e81eb --- /dev/null +++ b/board/MAI/bios_emulator/scitech/src/pm/common/vgastate.c @@ -0,0 +1,377 @@ +/**************************************************************************** +* +* 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); +} |
