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![Eric Pouech](/assets/img/avatar_default.png)
Signed-off-by: Eric Pouech <eric.pouech@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
454 lines
14 KiB
C
454 lines
14 KiB
C
/*
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* Emulation of processor ioports.
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*
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* Copyright 1995 Morten Welinder
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* Copyright 1998 Andreas Mohr, Ove Kaaven
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* Copyright 2001 Uwe Bonnes
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* Known problems:
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- only a few ports are emulated.
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- real-time clock in "cmos" is bogus. A nifty alarm() setup could
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fix that, I guess.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include "windef.h"
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#include "winbase.h"
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#include "winnls.h"
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#include "winreg.h"
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#include "winternl.h"
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#include "kernel16_private.h"
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#include "dosexe.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int);
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static struct {
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WORD countmax;
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WORD latch;
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BYTE ctrlbyte_ch;
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BYTE flags;
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LONG64 start_time;
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} tmr_8253[3] = {
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{0xFFFF, 0, 0x36, 0, 0},
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{0x0012, 0, 0x74, 0, 0},
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{0x0001, 0, 0xB6, 0, 0},
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};
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/* two byte read in progress */
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#define TMR_RTOGGLE 0x01
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/* two byte write in progress */
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#define TMR_WTOGGLE 0x02
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/* latch contains data */
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#define TMR_LATCHED 0x04
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/* counter is in update phase */
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#define TMR_UPDATE 0x08
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/* readback status request */
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#define TMR_STATUS 0x10
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static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
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static BYTE cmosaddress;
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static BOOL cmos_image_initialized = FALSE;
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static BYTE cmosimage[64] =
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{
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0x27, /* 0x00: seconds */
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0x34, /* 0X01: seconds alarm */
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0x31, /* 0x02: minutes */
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0x47, /* 0x03: minutes alarm */
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0x16, /* 0x04: hour */
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0x15, /* 0x05: hour alarm */
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0x00, /* 0x06: week day */
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0x01, /* 0x07: month day */
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0x04, /* 0x08: month */
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0x94, /* 0x09: year */
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0x26, /* 0x0a: state A */
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0x02, /* 0x0b: state B */
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0x50, /* 0x0c: state C */
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0x80, /* 0x0d: state D */
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0x00, /* 0x0e: state diagnostic */
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0x00, /* 0x0f: state state shutdown */
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0x40, /* 0x10: floppy type */
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0xb1, /* 0x11: reserved */
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0x00, /* 0x12: HD type */
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0x9c, /* 0x13: reserved */
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0x01, /* 0x14: equipment */
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0x80, /* 0x15: low base memory */
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0x02, /* 0x16: high base memory (0x280 => 640KB) */
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0x00, /* 0x17: low extended memory */
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0x3b, /* 0x18: high extended memory (0x3b00 => 15MB) */
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0x00, /* 0x19: HD 1 extended type byte */
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0x00, /* 0x1a: HD 2 extended type byte */
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0xad, /* 0x1b: reserved */
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0x02, /* 0x1c: reserved */
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0x10, /* 0x1d: reserved */
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0x00, /* 0x1e: reserved */
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0x00, /* 0x1f: installed features */
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0x08, /* 0x20: HD 1 low cylinder number */
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0x00, /* 0x21: HD 1 high cylinder number */
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0x00, /* 0x22: HD 1 heads */
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0x26, /* 0x23: HD 1 low pre-compensation start */
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0x00, /* 0x24: HD 1 high pre-compensation start */
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0x00, /* 0x25: HD 1 low landing zone */
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0x00, /* 0x26: HD 1 high landing zone */
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0x00, /* 0x27: HD 1 sectors */
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0x00, /* 0x28: options 1 */
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0x00, /* 0x29: reserved */
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0x00, /* 0x2a: reserved */
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0x00, /* 0x2b: options 2 */
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0x00, /* 0x2c: options 3 */
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0x3f, /* 0x2d: reserved */
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0xcc, /* 0x2e: low CMOS ram checksum (computed automatically) */
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0xcc, /* 0x2f: high CMOS ram checksum (computed automatically) */
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0x00, /* 0x30: low extended memory byte */
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0x1c, /* 0x31: high extended memory byte */
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0x19, /* 0x32: century byte */
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0x81, /* 0x33: setup information */
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0x00, /* 0x34: CPU speed */
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0x0e, /* 0x35: HD 2 low cylinder number */
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0x00, /* 0x36: HD 2 high cylinder number */
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0x80, /* 0x37: HD 2 heads */
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0x1b, /* 0x38: HD 2 low pre-compensation start */
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0x7b, /* 0x39: HD 2 high pre-compensation start */
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0x21, /* 0x3a: HD 2 low landing zone */
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0x00, /* 0x3b: HD 2 high landing zone */
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0x00, /* 0x3c: HD 2 sectors */
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0x00, /* 0x3d: reserved */
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0x05, /* 0x3e: reserved */
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0x5f /* 0x3f: reserved */
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};
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static void IO_FixCMOSCheckSum(void)
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{
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WORD sum = 0;
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int i;
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for (i=0x10; i < 0x2d; i++)
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sum += cmosimage[i];
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cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
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cmosimage[0x2f] = sum & 0xff;
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TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
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}
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#define BCD2BIN(a) \
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((a)%10 + ((a)>>4)%10*10 + ((a)>>8)%10*100 + ((a)>>12)%10*1000)
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#define BIN2BCD(a) \
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((a)%10 | (a)/10%10<<4 | (a)/100%10<<8 | (a)/1000%10<<12)
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static void set_timer(unsigned timer)
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{
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DWORD val = tmr_8253[timer].countmax;
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if (tmr_8253[timer].ctrlbyte_ch & 0x01)
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val = BCD2BIN(val);
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tmr_8253[timer].flags &= ~TMR_UPDATE;
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if (!QueryPerformanceCounter((LARGE_INTEGER*)&tmr_8253[timer].start_time))
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WARN("QueryPerformanceCounter should not fail!\n");
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switch (timer) {
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case 0: /* System timer counter divisor */
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break;
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case 1: /* RAM refresh */
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FIXME("RAM refresh counter handling not implemented !\n");
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break;
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case 2: /* cassette & speaker */
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/* speaker on ? */
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if ((parport_8255[1] & 3) == 3)
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{
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TRACE("Beep (freq: %ld) !\n", 1193180 / val);
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Beep(1193180 / val, 20);
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}
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break;
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}
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}
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static WORD get_timer_val(unsigned timer)
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{
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LARGE_INTEGER time;
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WORD maxval, val = tmr_8253[timer].countmax;
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BYTE mode = tmr_8253[timer].ctrlbyte_ch >> 1 & 0x07;
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/* This is not strictly correct. In most cases the old countdown should
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* finish normally (by counting down to 0) or halt and not jump to 0.
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* But we are calculating and not counting, so this seems to be a good
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* solution and should work well with most (all?) programs
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*/
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if (tmr_8253[timer].flags & TMR_UPDATE)
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return 0;
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if (!QueryPerformanceCounter(&time))
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WARN("QueryPerformanceCounter should not fail!\n");
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time.QuadPart -= tmr_8253[timer].start_time;
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if (tmr_8253[timer].ctrlbyte_ch & 0x01)
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val = BCD2BIN(val);
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switch ( mode )
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{
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case 0:
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case 1:
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case 4:
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case 5:
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maxval = tmr_8253[timer].ctrlbyte_ch & 0x01 ? 9999 : 0xFFFF;
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break;
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case 2:
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case 3:
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maxval = val;
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break;
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default:
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ERR("Invalid PIT mode: %d\n", mode);
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return 0;
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}
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val = (val - time.QuadPart) % (maxval + 1);
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if (tmr_8253[timer].ctrlbyte_ch & 0x01)
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val = BIN2BCD(val);
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return val;
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}
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/**********************************************************************
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* DOSVM_inport
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*
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* Note: The size argument has to be handled correctly _externally_
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* (as we always return a DWORD)
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*/
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DWORD DOSVM_inport( int port, int size )
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{
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DWORD res = ~0U;
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TRACE("%d-byte value from port 0x%04x\n", size, port );
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DOSMEM_InitDosMemory();
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switch (port)
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{
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case 0x40:
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case 0x41:
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case 0x42:
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{
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BYTE chan = port & 3;
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WORD tempval = tmr_8253[chan].flags & TMR_LATCHED
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? tmr_8253[chan].latch : get_timer_val(chan);
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if (tmr_8253[chan].flags & TMR_STATUS)
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{
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WARN("Read-back status\n");
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/* We differ slightly from the spec:
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* - TMR_UPDATE is already set with the first write
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* of a two byte counter update
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* - 0x80 should be set if OUT signal is 1 (high)
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*/
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tmr_8253[chan].flags &= ~TMR_STATUS;
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res = (tmr_8253[chan].ctrlbyte_ch & 0x3F) |
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(tmr_8253[chan].flags & TMR_UPDATE ? 0x40 : 0x00);
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break;
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}
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switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
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{
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case 0:
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res = 0; /* shouldn't happen? */
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break;
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case 1: /* read lo byte */
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res = (BYTE)tempval;
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tmr_8253[chan].flags &= ~TMR_LATCHED;
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break;
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case 3: /* read lo byte, then hi byte */
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tmr_8253[chan].flags ^= TMR_RTOGGLE; /* toggle */
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if (tmr_8253[chan].flags & TMR_RTOGGLE)
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{
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res = (BYTE)tempval;
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break;
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}
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/* else [fall through if read hi byte !] */
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case 2: /* read hi byte */
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res = (BYTE)(tempval >> 8);
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tmr_8253[chan].flags &= ~TMR_LATCHED;
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break;
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}
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}
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break;
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case 0x60:
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break;
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case 0x61:
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res = (DWORD)parport_8255[1];
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break;
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case 0x62:
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res = (DWORD)parport_8255[2];
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break;
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case 0x70:
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res = (DWORD)cmosaddress;
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break;
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case 0x71:
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if (!cmos_image_initialized)
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{
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IO_FixCMOSCheckSum();
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cmos_image_initialized = TRUE;
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}
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res = (DWORD)cmosimage[cmosaddress & 0x3f];
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break;
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case 0x200:
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case 0x201:
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res = ~0U; /* no joystick */
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break;
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default:
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WARN("Direct I/O read attempted from port %x\n", port);
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break;
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}
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return res;
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}
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/**********************************************************************
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* DOSVM_outport
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*/
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void DOSVM_outport( int port, int size, DWORD value )
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{
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TRACE("IO: 0x%lx (%d-byte value) to port 0x%04x\n", value, size, port );
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DOSMEM_InitDosMemory();
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switch (port)
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{
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case 0x20:
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break;
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case 0x40:
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case 0x41:
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case 0x42:
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{
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BYTE chan = port & 3;
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tmr_8253[chan].flags |= TMR_UPDATE;
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switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
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{
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case 0:
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break; /* shouldn't happen? */
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case 1: /* write lo byte */
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tmr_8253[chan].countmax =
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(tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
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break;
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case 3: /* write lo byte, then hi byte */
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tmr_8253[chan].flags ^= TMR_WTOGGLE; /* toggle */
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if (tmr_8253[chan].flags & TMR_WTOGGLE)
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{
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tmr_8253[chan].countmax =
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(tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
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break;
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}
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/* else [fall through if write hi byte !] */
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case 2: /* write hi byte */
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tmr_8253[chan].countmax =
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(tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
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break;
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}
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/* if programming is finished, update to new value */
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if ((tmr_8253[chan].ctrlbyte_ch & 0x30) &&
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!(tmr_8253[chan].flags & TMR_WTOGGLE))
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set_timer(chan);
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}
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break;
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case 0x43:
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{
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BYTE chan = ((BYTE)value & 0xc0) >> 6;
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/* ctrl byte for specific timer channel */
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if (chan == 3)
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{
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if ( !(value & 0x20) )
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{
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if ((value & 0x02) && !(tmr_8253[0].flags & TMR_LATCHED))
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{
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tmr_8253[0].flags |= TMR_LATCHED;
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tmr_8253[0].latch = get_timer_val(0);
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}
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if ((value & 0x04) && !(tmr_8253[1].flags & TMR_LATCHED))
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{
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tmr_8253[1].flags |= TMR_LATCHED;
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tmr_8253[1].latch = get_timer_val(1);
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}
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if ((value & 0x08) && !(tmr_8253[2].flags & TMR_LATCHED))
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{
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tmr_8253[2].flags |= TMR_LATCHED;
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tmr_8253[2].latch = get_timer_val(2);
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}
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}
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if ( !(value & 0x10) )
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{
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if (value & 0x02)
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tmr_8253[0].flags |= TMR_STATUS;
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if (value & 0x04)
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tmr_8253[1].flags |= TMR_STATUS;
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if (value & 0x08)
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tmr_8253[2].flags |= TMR_STATUS;
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}
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break;
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}
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switch (((BYTE)value & 0x30) >> 4)
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{
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case 0: /* latch timer */
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if ( !(tmr_8253[chan].flags & TMR_LATCHED) )
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{
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tmr_8253[chan].flags |= TMR_LATCHED;
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tmr_8253[chan].latch = get_timer_val(chan);
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}
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break;
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case 1: /* write lo byte only */
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case 2: /* write hi byte only */
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case 3: /* write lo byte, then hi byte */
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tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
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tmr_8253[chan].countmax = 0;
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tmr_8253[chan].flags = TMR_UPDATE;
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break;
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}
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}
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break;
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case 0x61:
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parport_8255[1] = (BYTE)value;
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if (((parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
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{
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TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
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Beep(1193180 / tmr_8253[2].countmax, 20);
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}
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break;
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case 0x70:
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cmosaddress = (BYTE)value & 0x7f;
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break;
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case 0x71:
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if (!cmos_image_initialized)
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{
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IO_FixCMOSCheckSum();
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cmos_image_initialized = TRUE;
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}
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cmosimage[cmosaddress & 0x3f] = (BYTE)value;
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break;
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default:
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WARN("Direct I/O write attempted to port %x\n", port );
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break;
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}
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}
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