summaryrefslogblamecommitdiffstatshomepage
path: root/src/devices/machine/i82371sb.cpp
blob: 9ae8c1fdb7029d76cbf6c2f7fe187c266c9e3c4b (plain) (tree)
1
2
3
4
5
6
7
8
9
10

                                     

                
                     

                                 


                         






















                                                                             







                                                                                                                           
                                                                                           






                                                                                                       

               



























































                                                                                                                      


                                                                                        
  


                                                                                        





                                                   























                                                                                                                        


                                         













                                                                                
                                                                                                                         
                                                                                                                            











                                                                                                                                                                          
                   

                                        





























                                             


 






                           



































































































































































































                                                                
                                                                                             
 
                                              


                                                                                 

                                                                                                                                                                      
 
                                                       
                                                       
                   



                                                                                                                                                                         










































                                                                                                                                            
                                                                    













                                                                              
                                                                           



                                                                                  

                                                                                  



                                                                                                                       
                                                                                                      

                             
                                                                     



                                                                                  
                                                              








                                                                                                                                         



































































































































































                                                                                                
                                                                              






                                                                        
                                                   



                                             
                                                  















































































                                                                                                              
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert

#include "emu.h"
#include "i82371sb.h"
#include "cpu/i386/i386.h"
#include "bus/pc_kbd/keyboards.h"
// VGA-HACK
#include "video/pc_vga.h"
// end-VGA-HACK
const device_type I82371SB_ISA = &device_creator<i82371sb_isa_device>;

DEVICE_ADDRESS_MAP_START(config_map, 32, i82371sb_isa_device)
	AM_RANGE(0x4c, 0x4f) AM_READWRITE8 (iort_r,    iort_w,    0x000000ff)
	AM_RANGE(0x4c, 0x4f) AM_READWRITE16(xbcs_r,    xbcs_w,    0xffff0000)
	AM_RANGE(0x60, 0x63) AM_READWRITE8 (pirqrc_r,  pirqrc_w,  0xffffffff)
	AM_RANGE(0x68, 0x6b) AM_READWRITE8 (tom_r,     tom_w,     0x000000ff)
	AM_RANGE(0x68, 0x6b) AM_READWRITE16(mstat_r,   mstat_w,   0xffff0000)
	AM_RANGE(0x70, 0x73) AM_READWRITE8 (mbirq0_r,  mbirq0_w,  0x000000ff)
	AM_RANGE(0x74, 0x77) AM_READWRITE8 (mbdma_r,   mbdma_w,   0xffff0000)
	AM_RANGE(0x80, 0x83) AM_READWRITE8 (dlc_r,     dlc_w,     0x00ff0000)
	AM_RANGE(0xa0, 0xa3) AM_READWRITE8 (smicntl_r, smicntl_w, 0x000000ff)
	AM_RANGE(0xa0, 0xa3) AM_READWRITE16(smien_r,   smien_w,   0xffff0000)
	AM_RANGE(0xa4, 0xa7) AM_READWRITE  (see_r,     see_w)
	AM_RANGE(0xa8, 0xab) AM_READWRITE8 (ftmr_r,    ftmr_w,    0x000000ff)
	AM_RANGE(0xa8, 0xab) AM_READWRITE16(smireq_r,  smireq_w,  0xffff0000)
	AM_RANGE(0xac, 0xaf) AM_READWRITE8 (ctltmr_r,  ctltmr_w,  0x000000ff)
	AM_RANGE(0xac, 0xaf) AM_READWRITE8 (cthtmr_r,  cthtmr_w,  0x00ff0000)

	AM_INHERIT_FROM(pci_device::config_map)
ADDRESS_MAP_END

DEVICE_ADDRESS_MAP_START(internal_io_map, 32, i82371sb_isa_device)
	AM_RANGE(0x0000, 0x001f) AM_DEVREADWRITE8("dma8237_1", am9517a_device, read, write, 0xffffffff)
	AM_RANGE(0x0020, 0x003f) AM_DEVREADWRITE8("pic8259_master", pic8259_device, read, write, 0xffffffff)
	AM_RANGE(0x0040, 0x005f) AM_DEVREADWRITE8("pit8254",   pit8254_device, read, write, 0xffffffff)
	AM_RANGE(0x0060, 0x0063) AM_READWRITE8(at_keybc_r, at_keybc_w, 0xffffffff);
	AM_RANGE(0x0064, 0x0067) AM_DEVREADWRITE8("keybc", at_keyboard_controller_device, status_r, command_w, 0xffffffff);
	AM_RANGE(0x0070, 0x007f) AM_DEVREADWRITE8("rtc", ds12885_device, read, write, 0xffffffff);
	AM_RANGE(0x0080, 0x009f) AM_READWRITE8(at_page8_r, at_page8_w, 0xffffffff);
	AM_RANGE(0x00a0, 0x00bf) AM_DEVREADWRITE8("pic8259_slave", pic8259_device, read, write, 0xffffffff)
	AM_RANGE(0x00c0, 0x00df) AM_READWRITE8(at_dma8237_2_r, at_dma8237_2_w, 0xffffffff);
	AM_RANGE(0x00e0, 0x00ef) AM_NOP

	// VGA-HACK
	AM_RANGE(0x3b0, 0x3bf) AM_DEVREADWRITE8("vga",vga_device,port_03b0_r, port_03b0_w, 0xffffffff);
	AM_RANGE(0x3c0, 0x3cf) AM_DEVREADWRITE8("vga",vga_device,port_03c0_r, port_03c0_w, 0xffffffff);
	AM_RANGE(0x3d0, 0x3df) AM_DEVREADWRITE8("vga",vga_device,port_03d0_r, port_03d0_w, 0xffffffff);
	// end-VGA-HACK
ADDRESS_MAP_END

static MACHINE_CONFIG_FRAGMENT( southbridge )
	MCFG_DEVICE_ADD("pit8254", PIT8254, 0)
	MCFG_PIT8253_CLK0(4772720/4) /* heartbeat IRQ */
	MCFG_PIT8253_OUT0_HANDLER(WRITELINE(i82371sb_isa_device, at_pit8254_out0_changed))
	MCFG_PIT8253_CLK1(4772720/4) /* dram refresh */
	MCFG_PIT8253_OUT1_HANDLER(WRITELINE(i82371sb_isa_device, at_pit8254_out1_changed))
	MCFG_PIT8253_CLK2(4772720/4) /* pio port c pin 4, and speaker polling enough */
	MCFG_PIT8253_OUT2_HANDLER(WRITELINE(i82371sb_isa_device, at_pit8254_out2_changed))

	MCFG_DEVICE_ADD( "dma8237_1", AM9517A, XTAL_14_31818MHz/3 )
	MCFG_I8237_OUT_HREQ_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq0_w))
	MCFG_I8237_OUT_EOP_CB(WRITELINE(i82371sb_isa_device, at_dma8237_out_eop))
	MCFG_I8237_IN_MEMR_CB(READ8(i82371sb_isa_device, pc_dma_read_byte))
	MCFG_I8237_OUT_MEMW_CB(WRITE8(i82371sb_isa_device, pc_dma_write_byte))
	MCFG_I8237_IN_IOR_0_CB(READ8(i82371sb_isa_device, pc_dma8237_0_dack_r))
	MCFG_I8237_IN_IOR_1_CB(READ8(i82371sb_isa_device, pc_dma8237_1_dack_r))
	MCFG_I8237_IN_IOR_2_CB(READ8(i82371sb_isa_device, pc_dma8237_2_dack_r))
	MCFG_I8237_IN_IOR_3_CB(READ8(i82371sb_isa_device, pc_dma8237_3_dack_r))
	MCFG_I8237_OUT_IOW_0_CB(WRITE8(i82371sb_isa_device, pc_dma8237_0_dack_w))
	MCFG_I8237_OUT_IOW_1_CB(WRITE8(i82371sb_isa_device, pc_dma8237_1_dack_w))
	MCFG_I8237_OUT_IOW_2_CB(WRITE8(i82371sb_isa_device, pc_dma8237_2_dack_w))
	MCFG_I8237_OUT_IOW_3_CB(WRITE8(i82371sb_isa_device, pc_dma8237_3_dack_w))
	MCFG_I8237_OUT_DACK_0_CB(WRITELINE(i82371sb_isa_device, pc_dack0_w))
	MCFG_I8237_OUT_DACK_1_CB(WRITELINE(i82371sb_isa_device, pc_dack1_w))
	MCFG_I8237_OUT_DACK_2_CB(WRITELINE(i82371sb_isa_device, pc_dack2_w))
	MCFG_I8237_OUT_DACK_3_CB(WRITELINE(i82371sb_isa_device, pc_dack3_w))

	MCFG_DEVICE_ADD( "dma8237_2", AM9517A, XTAL_14_31818MHz/3 )
	MCFG_I8237_OUT_HREQ_CB(WRITELINE(i82371sb_isa_device, pc_dma_hrq_changed))
	MCFG_I8237_IN_MEMR_CB(READ8(i82371sb_isa_device, pc_dma_read_word))
	MCFG_I8237_OUT_MEMW_CB(WRITE8(i82371sb_isa_device, pc_dma_write_word))
	MCFG_I8237_IN_IOR_1_CB(READ8(i82371sb_isa_device, pc_dma8237_5_dack_r))
	MCFG_I8237_IN_IOR_2_CB(READ8(i82371sb_isa_device, pc_dma8237_6_dack_r))
	MCFG_I8237_IN_IOR_3_CB(READ8(i82371sb_isa_device, pc_dma8237_7_dack_r))
	MCFG_I8237_OUT_IOW_1_CB(WRITE8(i82371sb_isa_device, pc_dma8237_5_dack_w))
	MCFG_I8237_OUT_IOW_2_CB(WRITE8(i82371sb_isa_device, pc_dma8237_6_dack_w))
	MCFG_I8237_OUT_IOW_3_CB(WRITE8(i82371sb_isa_device, pc_dma8237_7_dack_w))
	MCFG_I8237_OUT_DACK_0_CB(WRITELINE(i82371sb_isa_device, pc_dack4_w))
	MCFG_I8237_OUT_DACK_1_CB(WRITELINE(i82371sb_isa_device, pc_dack5_w))
	MCFG_I8237_OUT_DACK_2_CB(WRITELINE(i82371sb_isa_device, pc_dack6_w))
	MCFG_I8237_OUT_DACK_3_CB(WRITELINE(i82371sb_isa_device, pc_dack7_w))

	MCFG_PIC8259_ADD( "pic8259_master", INPUTLINE(":maincpu", 0), VCC, READ8(i82371sb_isa_device, get_slave_ack) )
	MCFG_PIC8259_ADD( "pic8259_slave", DEVWRITELINE("pic8259_master", pic8259_device, ir2_w), GND, NOOP)

	MCFG_DEVICE_ADD("keybc", AT_KEYBOARD_CONTROLLER, XTAL_12MHz)
	MCFG_AT_KEYBOARD_CONTROLLER_SYSTEM_RESET_CB(INPUTLINE(":maincpu", INPUT_LINE_RESET))
	MCFG_AT_KEYBOARD_CONTROLLER_GATE_A20_CB(INPUTLINE(":maincpu", INPUT_LINE_A20))
	MCFG_AT_KEYBOARD_CONTROLLER_INPUT_BUFFER_FULL_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir1_w))
	MCFG_AT_KEYBOARD_CONTROLLER_KEYBOARD_CLOCK_CB(DEVWRITELINE("pc_kbdc", pc_kbdc_device, clock_write_from_mb))
	MCFG_AT_KEYBOARD_CONTROLLER_KEYBOARD_DATA_CB(DEVWRITELINE("pc_kbdc", pc_kbdc_device, data_write_from_mb))
	MCFG_DEVICE_ADD("pc_kbdc", PC_KBDC, 0)
	MCFG_PC_KBDC_OUT_CLOCK_CB(DEVWRITELINE("keybc", at_keyboard_controller_device, keyboard_clock_w))
	MCFG_PC_KBDC_OUT_DATA_CB(DEVWRITELINE("keybc", at_keyboard_controller_device, keyboard_data_w))
	MCFG_PC_KBDC_SLOT_ADD("pc_kbdc", "kbd", pc_at_keyboards, STR_KBD_MICROSOFT_NATURAL)

	MCFG_DS12885_ADD("rtc")
	MCFG_MC146818_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir0_w))
	MCFG_MC146818_CENTURY_INDEX(0x32)

//  MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide", ata_devices, "hdd", nullptr, false)
//  MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir6_w))
//  MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM)
//
//  MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide2", ata_devices, "cdrom", nullptr, false)
//  MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir7_w))
//  MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM)

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
//
//  MCFG_DEVICE_ADD("isabus", ISA16, 0)
//  MCFG_ISA16_CPU(":maincpu")
//  MCFG_ISA_OUT_IRQ2_CB(DEVWRITELINE("pic8259_slave",  pic8259_device, ir2_w)) // in place of irq 2 on at irq 9 is used
//  MCFG_ISA_OUT_IRQ3_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir3_w))
//  MCFG_ISA_OUT_IRQ4_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir4_w))
//  MCFG_ISA_OUT_IRQ5_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir5_w))
//  MCFG_ISA_OUT_IRQ6_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir6_w))
//  MCFG_ISA_OUT_IRQ7_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir7_w))
//  MCFG_ISA_OUT_IRQ10_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir3_w))
//  MCFG_ISA_OUT_IRQ11_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir4_w))
//  MCFG_ISA_OUT_IRQ12_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir5_w))
//  MCFG_ISA_OUT_IRQ14_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir6_w))
//  MCFG_ISA_OUT_IRQ15_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir7_w))
//  MCFG_ISA_OUT_DRQ0_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq0_w))
//  MCFG_ISA_OUT_DRQ1_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq1_w))
//  MCFG_ISA_OUT_DRQ2_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq2_w))
//  MCFG_ISA_OUT_DRQ3_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq3_w))
//  MCFG_ISA_OUT_DRQ5_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq1_w))
//  MCFG_ISA_OUT_DRQ6_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq2_w))
//  MCFG_ISA_OUT_DRQ7_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq3_w))
//  // on board devices
//  MCFG_ISA16_SLOT_ADD("isabus","board1", pc_isa_onboard, "fdcsmc", true)
//  MCFG_ISA16_SLOT_ADD("isabus","board2", pc_isa_onboard, "comat", true)
//  MCFG_ISA16_SLOT_ADD("isabus","board3", pc_isa_onboard, "lpt", true)
	// VGA-HACK
	MCFG_FRAGMENT_ADD( pcvideo_vga );
	// end-VGA-HACK
MACHINE_CONFIG_END

//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor i82371sb_isa_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( southbridge );
}



i82371sb_isa_device::i82371sb_isa_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: pci_device(mconfig, I82371SB_ISA, "i82371sb southbridge ISA bridge", tag, owner, clock, "i82371sb_isa", __FILE__),
	  m_boot_state_hook(*this),
	m_maincpu(*this, ":maincpu"),
	m_pic8259_master(*this, "pic8259_master"),
	m_pic8259_slave(*this, "pic8259_slave"),
	m_dma8237_1(*this, "dma8237_1"),
	m_dma8237_2(*this, "dma8237_2"),
	m_pit8254(*this, "pit8254"),
	m_keybc(*this, "keybc"),
	m_speaker(*this, "speaker"),
	m_ds12885(*this, "rtc"),
	m_pc_kbdc(*this, "pc_kbdc")
	, m_at_spkrdata(0), m_pit_out2(0), m_dma_channel(0), m_cur_eop(false), m_dma_high_byte(0), m_at_speaker(0), m_refresh(false), m_channel_check(0), m_nmi_enabled(0)
	// VGA-HACK
	,m_vga_region(*this, ":ibm_vga")
	// end-VGA-HACK
{
}

void i82371sb_isa_device::device_start()
{
	pci_device::device_start();
	m_boot_state_hook.resolve();
}

void i82371sb_isa_device::device_reset()
{
	pci_device::device_reset();

	iort = 0x4d;
	xbcs = 0x0003;
	memset(pirqrc, 0x80, sizeof(pirqrc));
	tom = 0x02;
	mstat = 0x0000;
	mbirq0 = 0x80;
	memset(mbdma, 0x0c, sizeof(mbdma));
	pcsc = 0x0002;
	apicbase = 0x00;
	dlc = 0x00;
	smicntl = 0x08;
	smien = 0x0000;
	see = 0x00000000;
	ftmr = 0x0f;
	smireq = 0x0000;
	ctlmtr = 0x00;
	cthmtr = 0x00;



	m_at_spkrdata = 0;
	m_pit_out2 = 1;
	m_dma_channel = -1;
	m_cur_eop = false;
	m_nmi_enabled = 0;
	m_refresh = false;

}

void i82371sb_isa_device::reset_all_mappings()
{
	pci_device::reset_all_mappings();
}

WRITE8_MEMBER (i82371sb_isa_device::boot_state_w)
{
	m_boot_state_hook((offs_t)0, data);
}

WRITE8_MEMBER (i82371sb_isa_device::nop_w)
{
}

READ8_MEMBER (i82371sb_isa_device::iort_r)
{
	return iort;
}

WRITE8_MEMBER(i82371sb_isa_device::iort_w)
{
	iort = data;
	logerror("iort = %02x\n", iort);
}

READ16_MEMBER (i82371sb_isa_device::xbcs_r)
{
	return xbcs;
}

WRITE16_MEMBER(i82371sb_isa_device::xbcs_w)
{
	COMBINE_DATA(&xbcs);
	logerror("xbcs = %04x\n", xbcs);
}

READ8_MEMBER (i82371sb_isa_device::pirqrc_r)
{
	return pirqrc[offset];
}

WRITE8_MEMBER(i82371sb_isa_device::pirqrc_w)
{
	pirqrc[offset] = data;
	logerror("pirqrc[%d] = %02x\n", offset, pirqrc[offset]);
}

READ8_MEMBER (i82371sb_isa_device::tom_r)
{
	return tom;
}

WRITE8_MEMBER(i82371sb_isa_device::tom_w)
{
	tom = data;
	logerror("tom = %02x\n", tom);
}

READ16_MEMBER (i82371sb_isa_device::mstat_r)
{
	return mstat;
}

WRITE16_MEMBER(i82371sb_isa_device::mstat_w)
{
	COMBINE_DATA(&mstat);
	logerror("mstat = %04x\n", mstat);
}

READ8_MEMBER (i82371sb_isa_device::mbirq0_r)
{
	return mbirq0;
}

WRITE8_MEMBER(i82371sb_isa_device::mbirq0_w)
{
	mbirq0 = data;
	logerror("mbirq0 = %02x\n", mbirq0);
}

READ8_MEMBER (i82371sb_isa_device::mbdma_r)
{
	return mbdma[offset];
}

WRITE8_MEMBER(i82371sb_isa_device::mbdma_w)
{
	mbdma[offset] = data;
	logerror("mbdma[%d] = %02x\n", offset, mbdma);
}

READ8_MEMBER (i82371sb_isa_device::apicbase_r)
{
	return apicbase;
}

WRITE8_MEMBER(i82371sb_isa_device::apicbase_w)
{
	apicbase = data;
	logerror("apicbase = %02x\n", apicbase);
}

READ8_MEMBER (i82371sb_isa_device::dlc_r)
{
	return dlc;
}

WRITE8_MEMBER(i82371sb_isa_device::dlc_w)
{
	dlc = data;
	logerror("dlc = %02x\n", dlc);
}

READ8_MEMBER (i82371sb_isa_device::smicntl_r)
{
	return smicntl;
}

WRITE8_MEMBER(i82371sb_isa_device::smicntl_w)
{
	smicntl = data;
	logerror("smicntl = %02x\n", smicntl);
}

READ16_MEMBER (i82371sb_isa_device::smien_r)
{
	return smien;
}

WRITE16_MEMBER(i82371sb_isa_device::smien_w)
{
	COMBINE_DATA(&smien);
	logerror("smien = %04x\n", smien);
}

READ32_MEMBER (i82371sb_isa_device::see_r)
{
	return see;
}

WRITE32_MEMBER(i82371sb_isa_device::see_w)
{
	COMBINE_DATA(&see);
	logerror("see = %08x\n", see);
}

READ8_MEMBER (i82371sb_isa_device::ftmr_r)
{
	return ftmr;
}

WRITE8_MEMBER(i82371sb_isa_device::ftmr_w)
{
	ftmr = data;
	logerror("ftmr = %02x\n", ftmr);
}

READ16_MEMBER (i82371sb_isa_device::smireq_r)
{
	return smireq;
}

WRITE16_MEMBER(i82371sb_isa_device::smireq_w)
{
	COMBINE_DATA(&smireq);
	logerror("smireq = %04x\n", smireq);
}

READ8_MEMBER (i82371sb_isa_device::ctltmr_r)
{
	return ctlmtr;
}

WRITE8_MEMBER(i82371sb_isa_device::ctltmr_w)
{
	ctlmtr = data;
	logerror("ctlmtr = %02x\n", ctlmtr);
}

READ8_MEMBER (i82371sb_isa_device::cthtmr_r)
{
	return cthmtr;
}

WRITE8_MEMBER(i82371sb_isa_device::cthtmr_w)
{
	cthmtr = data;
	logerror("cthmtr = %02x\n", cthmtr);
}





void i82371sb_isa_device::map_bios(address_space *memory_space, uint32_t start, uint32_t end)
{
	uint32_t mask = m_region->bytes() - 1;
	memory_space->install_rom(start, end, m_region->base() + (start & mask));
}

void i82371sb_isa_device::map_extra(uint64_t memory_window_start, uint64_t memory_window_end, uint64_t memory_offset, address_space *memory_space,
									uint64_t io_window_start, uint64_t io_window_end, uint64_t io_offset, address_space *io_space)
{
	map_bios(memory_space, 0xfffc0000, 0xffffffff);
	map_bios(memory_space, 0x000e0000, 0x000fffff);
	// VGA-HACK
	vga_device *m_vga = subdevice<vga_device>("vga");
	memory_space->install_rom(0x000c0000, 0x000c7fff, m_vga_region->base());
	memory_space->install_readwrite_handler(0xa0000,0xbffff,read8_delegate(FUNC(vga_device::mem_r),m_vga),write8_delegate(FUNC(vga_device::mem_w),m_vga),0xffffffff);
	// end-VGA-HACK
	io_space->install_device(0, 0xffff, *this, &i82371sb_isa_device::internal_io_map);

#if 0
	if(fwh_dec_en1 & 0x80) {
		map_bios(memory_space, 0xfff80000, 0xffffffff, 7);
		map_bios(memory_space, 0xffb80000, 0xffbfffff, 7);
		map_bios(memory_space, 0x000e0000, 0x000fffff, 7);
	}
	if(fwh_dec_en1 & 0x40) {
		map_bios(memory_space, 0xfff00000, 0xfff7ffff, 6);
		map_bios(memory_space, 0xffb00000, 0xffb7ffff, 6);
	}
	if(fwh_dec_en1 & 0x20) {
		map_bios(memory_space, 0xffe80000, 0xffefffff, 5);
		map_bios(memory_space, 0xffa80000, 0xffafffff, 5);
	}
	if(fwh_dec_en1 & 0x10) {
		map_bios(memory_space, 0xffe00000, 0xffe7ffff, 4);
		map_bios(memory_space, 0xffa00000, 0xffa7ffff, 4);
	}
	if(fwh_dec_en1 & 0x08) {
		map_bios(memory_space, 0xffd80000, 0xffdfffff, 3);
		map_bios(memory_space, 0xff980000, 0xff9fffff, 3);
	}
	if(fwh_dec_en1 & 0x04) {
		map_bios(memory_space, 0xffd00000, 0xffd7ffff, 2);
		map_bios(memory_space, 0xff900000, 0xff97ffff, 2);
	}
	if(fwh_dec_en1 & 0x02) {
		map_bios(memory_space, 0xffc80000, 0xffcfffff, 1);
		map_bios(memory_space, 0xff880000, 0xff8fffff, 1);
	}
	if(fwh_dec_en1 & 0x01) {
		map_bios(memory_space, 0xffc00000, 0xffc7ffff, 0);
		map_bios(memory_space, 0xff800000, 0xff87ffff, 0);
	}


	if(acpi_cntl & 0x10)
		acpi->map_device(memory_window_start, memory_window_end, 0, memory_space, io_window_start, io_window_end, pmbase, io_space);
	if(gpio_cntl & 0x10)
		logerror("%s: Warning: gpio range enabled at %04x-%04x\n", tag(), gpio_base, gpio_base+63);

	uint32_t hpet = 0xfed00000 + ((gen_cntl & 0x00018000) >> 3);
	logerror("%s: Warning: hpet at %08x-%08x\n", tag(), hpet, hpet+0x3ff);

	if(lpc_en & 0x1000)
		logerror("%s: Warning: superio at 2e-2f\n", tag());
	if(lpc_en & 0x0800)
		logerror("%s: Warning: mcu at 62/66\n", tag());
	if(lpc_en & 0x0400)
		logerror("%s: Warning: mcu at 60/64\n", tag());
	if(lpc_en & 0x0200)
		logerror("%s: Warning: gameport at 208-20f\n", tag());
	if(lpc_en & 0x0100)
		logerror("%s: Warning: gameport at 200-207\n", tag());

	if(lpc_en & 0x0008) {
		uint16_t fdc = lpc_if_fdd_lpt_range & 0x10 ? 0x370 : 0x3f0;
		logerror("%s: Warning: floppy at %04x-%04x\n", tag(), fdc, fdc+7);
	}

	if(lpc_en & 0x0004) {
		static const uint16_t lpt_pos[4] = { 0x378, 0x278, 0x3bc, 0x000 };
		uint16_t lpt = lpt_pos[lpc_if_fdd_lpt_range & 3];
		if(lpt)
			logerror("%s: Warning: lpt at %04x-%04x %04x-%04x\n", tag(), lpt, lpt+7, lpt+0x400, lpt+0x407);
	}

	static const uint16_t com_pos[8] = { 0x3f8, 0x2f8, 0x220, 0x228, 0x238, 0x2e8, 0x338, 0x3e8 };

	if(lpc_en & 0x0002) {
		uint16_t comb = com_pos[(lpc_if_com_range >> 4) & 7];
		logerror("%s: Warning: comb at %04x-%04x\n", tag(), comb, comb+7);
	}

	if(lpc_en & 0x0001) {
		uint16_t coma = com_pos[lpc_if_com_range & 7];
		logerror("%s: Warning: coma at %04x-%04x\n", tag(), coma, coma+7);
	}

	rtc->map_device(memory_window_start, memory_window_end, 0, memory_space, io_window_start, io_window_end, 0, io_space);
	if(rtc_conf & 4)
		rtc->map_extdevice(memory_window_start, memory_window_end, 0, memory_space, io_window_start, io_window_end, 0, io_space);
	pit->map_device(memory_window_start, memory_window_end, 0, memory_space, io_window_start, io_window_end, 0, io_space);
#endif
}


// Southbridge
READ8_MEMBER( i82371sb_isa_device::get_slave_ack )
{
	if (offset==2) // IRQ = 2
		return m_pic8259_slave->acknowledge();

	return 0x00;
}

void i82371sb_isa_device::at_speaker_set_spkrdata(uint8_t data)
{
	m_at_spkrdata = data ? 1 : 0;
	m_speaker->level_w(m_at_spkrdata & m_pit_out2);
}



WRITE_LINE_MEMBER( i82371sb_isa_device::at_pit8254_out0_changed )
{
	if (m_pic8259_master)
		m_pic8259_master->ir0_w(state);
}

WRITE_LINE_MEMBER( i82371sb_isa_device::at_pit8254_out1_changed )
{
	if(state)
		m_refresh = !m_refresh;
}

WRITE_LINE_MEMBER( i82371sb_isa_device::at_pit8254_out2_changed )
{
	m_pit_out2 = state ? 1 : 0;
	m_speaker->level_w(m_at_spkrdata & m_pit_out2);
}

READ8_MEMBER( i82371sb_isa_device::at_page8_r )
{
	uint8_t data = m_at_pages[offset % 0x10];

	switch(offset % 8)
	{
	case 1:
		data = m_dma_offset[BIT(offset, 3)][2];
		break;
	case 2:
		data = m_dma_offset[BIT(offset, 3)][3];
		break;
	case 3:
		data = m_dma_offset[BIT(offset, 3)][1];
		break;
	case 7:
		data = m_dma_offset[BIT(offset, 3)][0];
		break;
	}
	return data;
}


WRITE8_MEMBER( i82371sb_isa_device::at_page8_w )
{
	m_at_pages[offset % 0x10] = data;

	switch(offset % 8)
	{
	case 0:
		m_boot_state_hook((offs_t)0, data);
		break;
	case 1:
		m_dma_offset[BIT(offset, 3)][2] = data;
		break;
	case 2:
		m_dma_offset[BIT(offset, 3)][3] = data;
		break;
	case 3:
		m_dma_offset[BIT(offset, 3)][1] = data;
		break;
	case 7:
		m_dma_offset[BIT(offset, 3)][0] = data;
		break;
	}
}


WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dma_hrq_changed )
{
	m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);

	/* Assert HLDA */
	m_dma8237_2->hack_w( state );
}

READ8_MEMBER(i82371sb_isa_device::pc_dma_read_byte)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
	if(m_dma_channel == -1)
		return 0xff;
	uint8_t result;
	offs_t page_offset = ((offs_t) m_dma_offset[0][m_dma_channel]) << 16;

	result = prog_space.read_byte(page_offset + offset);
	return result;
}


WRITE8_MEMBER(i82371sb_isa_device::pc_dma_write_byte)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
	if(m_dma_channel == -1)
		return;
	offs_t page_offset = ((offs_t) m_dma_offset[0][m_dma_channel]) << 16;

	prog_space.write_byte(page_offset + offset, data);
}


READ8_MEMBER(i82371sb_isa_device::pc_dma_read_word)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
	if(m_dma_channel == -1)
		return 0xff;
	uint16_t result;
	offs_t page_offset = ((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16;

	result = prog_space.read_word((page_offset & 0xfe0000) | (offset << 1));
	m_dma_high_byte = result & 0xFF00;

	return result & 0xFF;
}


WRITE8_MEMBER(i82371sb_isa_device::pc_dma_write_word)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
	if(m_dma_channel == -1)
		return;
	offs_t page_offset = ((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16;

	prog_space.write_word((page_offset & 0xfe0000) | (offset << 1), m_dma_high_byte | data);
}


READ8_MEMBER( i82371sb_isa_device::pc_dma8237_0_dack_r ) { return 0; } //m_isabus->dack_r(0); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_1_dack_r ) { return 0; } //m_isabus->dack_r(1); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_2_dack_r ) { return 0; } //m_isabus->dack_r(2); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_3_dack_r ) { return 0; } //m_isabus->dack_r(3); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_5_dack_r ) { return 0; } //m_isabus->dack_r(5); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_6_dack_r ) { return 0; } //m_isabus->dack_r(6); }
READ8_MEMBER( i82371sb_isa_device::pc_dma8237_7_dack_r ) { return 0; } //m_isabus->dack_r(7); }


WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_0_dack_w ){ } //m_isabus->dack_w(0, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_1_dack_w ){ } //m_isabus->dack_w(1, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_2_dack_w ){ } //m_isabus->dack_w(2, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_3_dack_w ){ } //m_isabus->dack_w(3, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_5_dack_w ){ } //m_isabus->dack_w(5, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_6_dack_w ){ } //m_isabus->dack_w(6, data); }
WRITE8_MEMBER( i82371sb_isa_device::pc_dma8237_7_dack_w ){ } //m_isabus->dack_w(7, data); }

WRITE_LINE_MEMBER( i82371sb_isa_device::at_dma8237_out_eop )
{
	m_cur_eop = state == ASSERT_LINE;
	//if(m_dma_channel != -1)
//      m_isabus->eop_w(m_dma_channel, m_cur_eop ? ASSERT_LINE : CLEAR_LINE );
}

void i82371sb_isa_device::pc_select_dma_channel(int channel, bool state)
{
	if(!state) {
		m_dma_channel = channel;
		//if(m_cur_eop)
//          m_isabus->eop_w(channel, ASSERT_LINE );

	} else if(m_dma_channel == channel) {
		m_dma_channel = -1;
		//if(m_cur_eop)
//          m_isabus->eop_w(channel, CLEAR_LINE );
	}
}


WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack0_w ) { pc_select_dma_channel(0, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack1_w ) { pc_select_dma_channel(1, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack2_w ) { pc_select_dma_channel(2, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack3_w ) { pc_select_dma_channel(3, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack4_w ) { m_dma8237_1->hack_w( state ? 0 : 1); } // it's inverted
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack5_w ) { pc_select_dma_channel(5, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack6_w ) { pc_select_dma_channel(6, state); }
WRITE_LINE_MEMBER( i82371sb_isa_device::pc_dack7_w ) { pc_select_dma_channel(7, state); }

READ8_MEMBER( i82371sb_isa_device::at_portb_r )
{
	uint8_t data = m_at_speaker;
	data &= ~0xd0; /* AT BIOS don't likes this being set */

	/* 0x10 is the dram refresh line bit on the 5170, just a timer here, 15.085us. */
	data |= m_refresh ? 0x10 : 0;

	if (m_pit_out2)
		data |= 0x20;
	else
		data &= ~0x20; /* ps2m30 wants this */

	return data;
}

WRITE8_MEMBER( i82371sb_isa_device::at_portb_w )
{
	m_at_speaker = data;
	m_pit8254->write_gate2(BIT(data, 0));
	at_speaker_set_spkrdata( BIT(data, 1));
	m_channel_check = BIT(data, 3);
	//m_isabus->set_nmi_state((m_nmi_enabled==0) && (m_channel_check==0));
}

READ8_MEMBER( i82371sb_isa_device::at_dma8237_2_r )
{
	return m_dma8237_2->read( space, offset / 2);
}

WRITE8_MEMBER( i82371sb_isa_device::at_dma8237_2_w )
{
	m_dma8237_2->write( space, offset / 2, data);
}

READ8_MEMBER( i82371sb_isa_device::at_keybc_r )
{
	switch (offset)
	{
	case 0: return m_keybc->data_r(space, 0);
	case 1: return at_portb_r(space, 0);
	}

	return 0xff;
}

WRITE8_MEMBER( i82371sb_isa_device::at_keybc_w )
{
	switch (offset)
	{
	case 0: m_keybc->data_w(space, 0, data); break;
	case 1: at_portb_w(space, 0, data); break;
	}
}


WRITE8_MEMBER( i82371sb_isa_device::write_rtc )
{
	if (offset==0) {
		m_nmi_enabled = BIT(data,7);
		//m_isabus->set_nmi_state((m_nmi_enabled==0) && (m_channel_check==0));
		m_ds12885->write(space,0,data);
	}
	else {
		m_ds12885->write(space,offset,data);
	}
}