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- deassert HRQ if no DRQ is pending

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- fixed boundary check for 16-bit DMA
- removed unnecessary comments
This commit is contained in:
Volker Ruppert 2002-01-05 10:28:49 +00:00
parent 45f11e30b2
commit 4b759265e9
1 changed files with 20 additions and 15 deletions
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35
bochs/iodev/dma.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: dma.cc,v 1.14 2002-01-02 10:00:54 vruppert Exp $
// $Id: dma.cc,v 1.15 2002-01-05 10:28:49 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -59,7 +59,7 @@ bx_dma_c::~bx_dma_c(void)
bx_dma_c::init(bx_devices_c *d)
{
unsigned c;
BX_DEBUG(("Init $Id: dma.cc,v 1.14 2002-01-02 10:00:54 vruppert Exp $"));
BX_DEBUG(("Init $Id: dma.cc,v 1.15 2002-01-05 10:28:49 vruppert Exp $"));
BX_DMA_THIS devices = d;
@ -400,7 +400,7 @@ bx_dma_c::write(Bit32u address, Bit32u value, unsigned io_len)
channel = value & 0x03;
BX_DMA_THIS s[ma_sl].mask[channel] = (set_mask_bit > 0);
BX_DEBUG(("DMA-%d: set_mask_bit=%u, channel=%u, mask now=%02xh", ma_sl+1,
(unsigned) set_mask_bit, (unsigned) channel, (unsigned) BX_DMA_THIS s[0].mask[channel]));
(unsigned) set_mask_bit, (unsigned) channel, (unsigned) BX_DMA_THIS s[ma_sl].mask[channel]));
return;
break;
@ -529,11 +529,18 @@ bx_dma_c::DRQ(unsigned channel, Boolean val)
if (!val) {
//BX_DEBUG(("bx_dma_c::DRQ(): val == 0"));
// clear bit in status reg
// deassert HRQ if not pending DRQ's ?
// etc.
BX_DMA_THIS s[ma_sl].status_reg &= ~(1 << (channel+4));
return;
// deassert HRQ if no DRQ is pending
if ((BX_DMA_THIS s[ma_sl].status_reg & 0xf0) == 0) {
if (ma_sl) {
bx_pc_system.set_HRQ(0);
} else {
bx_pc_system.set_DRQ(4, 0);
}
}
return;
}
#if 0
BX_INFO(("mask[%d]: %02x", channel, (unsigned) BX_DMA_THIS s[0].mask[channel]));
@ -563,16 +570,15 @@ bx_dma_c::DRQ(unsigned channel, Boolean val)
(unsigned) BX_DMA_THIS s[ma_sl].chan[channel].mode.mode_type));
if (BX_DMA_THIS s[ma_sl].chan[channel].mode.address_decrement != 0)
BX_PANIC(("DRQ: address_decrement != 0"));
//if (BX_DMA_THIS s.chan[channel].mode.autoinit_enable != 0)
// BX_PANIC(("bx_dma_c::DRQ: autoinit_enable != 0"));
dma_base = (BX_DMA_THIS s[ma_sl].chan[channel].page_reg << 16) | BX_DMA_THIS s[ma_sl].chan[channel].base_address;
dma_roof = dma_base + BX_DMA_THIS s[ma_sl].chan[channel].base_count;
if ( (dma_base & 0xffff0000) != (dma_roof & 0xffff0000) ) {
dma_base = (BX_DMA_THIS s[ma_sl].chan[channel].page_reg << 16) |
(BX_DMA_THIS s[ma_sl].chan[channel].base_address << ma_sl);
dma_roof = dma_base + (BX_DMA_THIS s[ma_sl].chan[channel].base_count << ma_sl);
if ( (dma_base & (0x7fff0000 << ma_sl)) != (dma_roof & (0x7fff0000 << ma_sl)) ) {
BX_INFO(("dma_base = %08x", (unsigned) dma_base));
BX_INFO(("dma_base_count = %08x", (unsigned) BX_DMA_THIS s[0].chan[channel].base_count));
BX_INFO(("dma_base_count = %08x", (unsigned) BX_DMA_THIS s[ma_sl].chan[channel].base_count));
BX_INFO(("dma_roof = %08x", (unsigned) dma_roof));
BX_PANIC(("request outside 64k boundary"));
BX_PANIC(("request outside %dk boundary", 64 << ma_sl));
}
if (ma_sl) {
@ -613,8 +619,7 @@ bx_dma_c::raise_HLDA(bx_pc_system_c *pc_sys)
}
}
if (channel >= 4) {
// don't panic, just wait till they're unmasked
// BX_PANIC(("hlda: no unmasked requests"));
// wait till they're unmasked
return;
}