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- better floppy write timing implementation (TC pulse is only available in DMA

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r/w functions and must be stored in a variable)
This commit is contained in:
Volker Ruppert 2005-11-10 18:56:45 +00:00
parent fd2175eb57
commit 902b8ec684
2 changed files with 33 additions and 28 deletions
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58
bochs/iodev/floppy.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: floppy.cc,v 1.85 2005-11-09 19:13:32 vruppert Exp $
// $Id: floppy.cc,v 1.86 2005-11-10 18:56:45 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -132,7 +132,7 @@ bx_floppy_ctrl_c::init(void)
{
Bit8u i;
BX_DEBUG(("Init $Id: floppy.cc,v 1.85 2005-11-09 19:13:32 vruppert Exp $"));
BX_DEBUG(("Init $Id: floppy.cc,v 1.86 2005-11-10 18:56:45 vruppert Exp $"));
DEV_dma_register_8bit_channel(2, dma_read, dma_write, "Floppy Drive");
DEV_register_irq(6, "Floppy Drive");
for (unsigned addr=0x03F2; addr<=0x03F7; addr++) {
@ -1133,12 +1133,33 @@ bx_floppy_ctrl_c::timer()
enter_result_phase();
break;
case 0x45: /* write normal data */
case 0xc5:
if (BX_FD_THIS s.TC) { // Terminal Count line, done
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive] << 2) | drive;
BX_FD_THIS s.status_reg1 = 0;
BX_FD_THIS s.status_reg2 = 0;
if (bx_dbg.floppy) {
BX_INFO(("<<WRITE DONE>>"));
BX_INFO(("AFTER"));
BX_INFO((" drive = %u", (unsigned) drive));
BX_INFO((" head = %u", (unsigned) BX_FD_THIS s.head[drive]));
BX_INFO((" cylinder = %u", (unsigned) BX_FD_THIS s.cylinder[drive]));
BX_INFO((" sector = %u", (unsigned) BX_FD_THIS s.sector[drive]));
}
enter_result_phase();
} else {
// transfer next sector
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 1);
}
break;
case 0x46: /* read normal data */
case 0x66:
case 0xc6:
case 0xe6:
case 0x45: /* write normal data */
case 0xc5:
// transfer next sector
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 1);
break;
@ -1292,29 +1313,12 @@ bx_floppy_ctrl_c::dma_read(Bit8u *data_byte)
512, TO_FLOPPY);
increment_sector(); // increment to next sector after writing current one
BX_FD_THIS s.floppy_buffer_index = 0;
if (DEV_dma_get_tc()) { // Terminal Count line, done
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive] << 2) | drive;
BX_FD_THIS s.status_reg1 = 0;
BX_FD_THIS s.status_reg2 = 0;
if (bx_dbg.floppy) {
BX_INFO(("<<WRITE DONE>>"));
BX_INFO(("AFTER"));
BX_INFO((" drive = %u", (unsigned) drive));
BX_INFO((" head = %u", (unsigned) BX_FD_THIS s.head[drive]));
BX_INFO((" cylinder = %u", (unsigned) BX_FD_THIS s.cylinder[drive]));
BX_INFO((" sector = %u", (unsigned) BX_FD_THIS s.sector[drive]));
}
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
enter_result_phase();
} else { // more data to transfer
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
// time to read one sector at 300 rpm
sector_time = 200000 / BX_FD_THIS s.media[drive].sectors_per_track;
bx_pc_system.activate_timer(BX_FD_THIS s.floppy_timer_index,
sector_time , 0);
}
BX_FD_THIS s.TC = DEV_dma_get_tc();
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
// time to write one sector at 300 rpm
sector_time = 200000 / BX_FD_THIS s.media[drive].sectors_per_track;
bx_pc_system.activate_timer(BX_FD_THIS s.floppy_timer_index,
sector_time , 0);
}
}
}

3
bochs/iodev/floppy.h
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: floppy.h,v 1.21 2005-10-27 07:37:46 vruppert Exp $
// $Id: floppy.h,v 1.22 2005-11-10 18:56:45 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -88,6 +88,7 @@ private:
Bit8u head[4]; // really only using 2 drives
Bit8u sector[4]; // really only using 2 drives
Bit8u eot[4]; // really only using 2 drives
bx_bool TC; // Terminal Count status from DMA controller
/* MAIN STATUS REGISTER
* b7: MRQ: main request 1=data register ready 0=data register not ready