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implemented timer latching 

trace message fix
temporary "fix" for Linux's coarse timer resolution
This commit is contained in:
Andreas Mohr 1999-01-30 13:37:54 +00:00 committed by Alexandre Julliard
parent f56d029f96
commit 935ccabe08
1 changed files with 35 additions and 9 deletions
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44
msdos/ioports.c
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@ -25,7 +25,12 @@
static WORD tmr_8253_countmax[3] = {0xffff, 0x12, 1}; /* [2] needs to be 1 ! */
/* if byte_toggle is TRUE, then hi byte has already been written */
static BOOL16 tmr_8253_byte_toggle[3] = {FALSE, FALSE, FALSE};
static WORD tmr_8253_latch[3] = {0, 0, 0};
/* 4th contents are dummy */
static BOOL16 tmr_8253_latched[4] = {FALSE, FALSE, FALSE, FALSE};
static BYTE tmr_8253_ctrlbyte_ch[4] = {0x06, 0x44, 0x86, 0};
static int dummy_ctr = 0;
static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
@ -244,6 +249,8 @@ DWORD IO_inport( int port, int size )
{
DWORD res = 0;
TRACE(int, "%d-byte value from port 0x%02x\n", size, port );
#ifdef DIRECT_IO_ACCESS
if ((do_direct_port_access)
/* Make sure we have access to the port */
@ -263,8 +270,6 @@ DWORD IO_inport( int port, int size )
}
#endif
TRACE(int, "%d-byte value from port 0x%02x\n", size, port );
switch (port)
{
case 0x40:
@ -274,13 +279,22 @@ DWORD IO_inport( int port, int size )
BYTE chan = port & 3;
WORD tempval = 0;
if (tmr_8253_latched[chan] == TRUE)
{
tempval = tmr_8253_latch[chan];
tmr_8253_latched[chan] = FALSE;
}
else
{
dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
if (chan == 0) /* System timer counter divisor */
tempval = (WORD)DOSVM_GetTimer();
/* FIXME: DOSVM_GetTimer() returns quite rigid values */
tempval = dummy_ctr+(WORD)DOSVM_GetTimer();
else
{ /* FIXME: intelligent hardware timer emulation needed */
dummy_ctr -= 10;
tempval = dummy_ctr;
}
}
switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
{
case 0x00:
@ -408,16 +422,28 @@ void IO_outport( int port, int size, DWORD value )
}
break;
case 0x43:
{
BYTE chan = ((BYTE)value & 0xc0) >> 6;
/* ctrl byte for specific timer channel */
tmr_8253_ctrlbyte_ch[((BYTE)value & 0xc0) >> 6] = (BYTE)value;
if (((BYTE)value&0xc0)==0xc0) {
tmr_8253_ctrlbyte_ch[chan] = (BYTE)value;
if (chan == 3) {
FIXME(int,"8254 timer readback not implemented yet\n");
} else
if (((BYTE)value&3)==0) {
FIXME(int,"timer counter latch not implemented yet\n");
}
else
if (((BYTE)value&0x30)==0) { /* latch timer */
tmr_8253_latched[chan] = TRUE;
dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
if (chan == 0) /* System timer divisor */
tmr_8253_latch[0] = dummy_ctr+(WORD)DOSVM_GetTimer();
else
{ /* FIXME: intelligent hardware timer emulation needed */
tmr_8253_latch[chan] = dummy_ctr;
}
}
if ((value & 0x30) == 0x30) /* write lo byte, then hi byte */
tmr_8253_byte_toggle[((BYTE)value & 0xc0) >> 6] = FALSE; /* init */
}
break;
case 0x61:
parport_8255[1] = (BYTE)value;