hw/dma.c - qemu - Git at Google

 /*
  * QEMU DMA emulation
  *
  * Copyright (c) 2003 Vassili Karpov (malc)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>

 #include "cpu.h"
 #include "vl.h"

 #define log(...) fprintf (stderr, "dma: " __VA_ARGS__)
 #ifdef DEBUG_DMA
 #define lwarn(...) fprintf (stderr, "dma: " __VA_ARGS__)
 #define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
 #define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
 #else
 #define lwarn(...)
 #define linfo(...)
 #define ldebug(...)
 #endif

 #define MEM_REAL(addr) ((addr)+(uint32_t)(phys_ram_base))
 #define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))

 struct dma_regs {
     int now[2];
     uint16_t base[2];
     uint8_t mode;
     uint8_t page;
     uint8_t dack;
     uint8_t eop;
     DMA_read_handler read_handler;
     DMA_misc_handler misc_handler;
 };

 #define ADDR 0
 #define COUNT 1

 static struct dma_cont {
     uint8_t status;
     uint8_t command;
     uint8_t mask;
     uint8_t flip_flop;
     struct dma_regs regs[4];
 } dma_controllers[2];

 enum {
   CMD_MEMORY_TO_MEMORY = 0x01,
   CMD_FIXED_ADDRESS    = 0x02,
   CMD_BLOCK_CONTROLLER = 0x04,
   CMD_COMPRESSED_TIME  = 0x08,
   CMD_CYCLIC_PRIORITY  = 0x10,
   CMD_EXTENDED_WRITE   = 0x20,
   CMD_LOW_DREQ         = 0x40,
   CMD_LOW_DACK         = 0x80,
   CMD_NOT_SUPPORTED    = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS
   | CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE
   | CMD_LOW_DREQ | CMD_LOW_DACK

 };

 static void write_page (CPUState *env, uint32_t nport, uint32_t data)
 {
     int ichan;
     int ncont;
     static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};

     ncont = nport > 0x87;
     ichan = channels[nport - 0x80 - (ncont << 3)];

     if (-1 == ichan) {
         log ("invalid channel %#x %#x\n", nport, data);
         return;
     }

     dma_controllers[ncont].regs[ichan].page = data;
 }

 static void init_chan (int ncont, int ichan)
 {
     struct dma_regs *r;

     r = dma_controllers[ncont].regs + ichan;
     r->now[ADDR] = r->base[0] << ncont;
     r->now[COUNT] = 0;
 }

 static inline int getff (int ncont)
 {
     int ff;

     ff = dma_controllers[ncont].flip_flop;
     dma_controllers[ncont].flip_flop = !ff;
     return ff;
 }

 static uint32_t read_chan (CPUState *env, uint32_t nport)
 {
     int ff;
     int ncont, ichan, nreg;
     struct dma_regs *r;
     int val;

     ncont = nport > 7;
     ichan = (nport >> (1 + ncont)) & 3;
     nreg = (nport >> ncont) & 1;
     r = dma_controllers[ncont].regs + ichan;

     ff = getff (ncont);

     if (nreg)
         val = (r->base[COUNT] << ncont) - r->now[COUNT];
     else
         val = r->now[ADDR] + r->now[COUNT];

     return (val >> (ncont + (ff << 3))) & 0xff;
 }

 static void write_chan (CPUState *env, uint32_t nport, uint32_t data)
 {
     int ncont, ichan, nreg;
     struct dma_regs *r;

     ncont = nport > 7;
     ichan = (nport >> (1 + ncont)) & 3;
     nreg = (nport >> ncont) & 1;
     r = dma_controllers[ncont].regs + ichan;

     if (getff (ncont)) {
         r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00);
         init_chan (ncont, ichan);
     } else {
         r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff);
     }
 }

 static void write_cont (CPUState *env, uint32_t nport, uint32_t data)
 {
     int iport, ichan, ncont;
     struct dma_cont *d;

     ncont = nport > 0xf;
     ichan = -1;

     d = dma_controllers + ncont;
     if (ncont) {
         iport = ((nport - 0xd0) >> 1) + 8;
     }
     else {
         iport = nport;
     }

     switch (iport) {
     case 8:                     /* command */
         if (data && (data | CMD_NOT_SUPPORTED)) {
             log ("command %#x not supported\n", data);
             goto error;
         }
         d->command = data;
         break;

     case 9:
         ichan = data & 3;
         if (data & 4) {
             d->status |= 1 << (ichan + 4);
         }
         else {
             d->status &= ~(1 << (ichan + 4));
         }
         d->status &= ~(1 << ichan);
         break;

     case 0xa:                   /* single mask */
         if (data & 4)
             d->mask |= 1 << (data & 3);
         else
             d->mask &= ~(1 << (data & 3));
         break;

     case 0xb:                   /* mode */
         {
             ichan = data & 3;
 #ifdef DEBUG_DMA
             int op;
             int ai;
             int dir;
             int opmode;

             op = (data >> 2) & 3;
             ai = (data >> 4) & 1;
             dir = (data >> 5) & 1;
             opmode = (data >> 6) & 3;

             linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
                    ichan, op, ai, dir, opmode);
 #endif

             d->regs[ichan].mode = data;
             break;
         }

     case 0xc:                   /* clear flip flop */
         d->flip_flop = 0;
         break;

     case 0xd:                   /* reset */
         d->flip_flop = 0;
         d->mask = ~0;
         d->status = 0;
         d->command = 0;
         break;

     case 0xe:                   /* clear mask for all channels */
         d->mask = 0;
         break;

     case 0xf:                   /* write mask for all channels */
         d->mask = data;
         break;

     default:
         log ("dma: unknown iport %#x\n", iport);
         goto error;
     }

 #ifdef DEBUG_DMA
     if (0xc != iport) {
         linfo ("nport %#06x, ncont %d, ichan % 2d, val %#06x\n",
                nport, d != dma_controllers, ichan, data);
     }
 #endif
     return;

  error:
     abort ();
 }

 int DMA_get_channel_mode (int nchan)
 {
     return dma_controllers[nchan > 3].regs[nchan & 3].mode;
 }

 void DMA_hold_DREQ (int nchan)
 {
     int ncont, ichan;

     ncont = nchan > 3;
     ichan = nchan & 3;
     linfo ("held cont=%d chan=%d\n", ncont, ichan);
     dma_controllers[ncont].status |= 1 << (ichan + 4);
 }

 void DMA_release_DREQ (int nchan)
 {
     int ncont, ichan;

     ncont = nchan > 3;
     ichan = nchan & 3;
     linfo ("released cont=%d chan=%d\n", ncont, ichan);
     dma_controllers[ncont].status &= ~(1 << (ichan + 4));
 }

 static void channel_run (int ncont, int ichan)
 {
     struct dma_regs *r;
     int n;
     int irq;
     uint32_t addr;
 /*     int ai, dir; */

     r = dma_controllers[ncont].regs + ichan;
 /*   ai = r->mode & 16; */
 /*   dir = r->mode & 32 ? -1 : 1; */

     addr = MEM_REAL ((r->page << 16) | r->now[ADDR]);

     irq = -1;
     n = r->read_handler (addr, (r->base[COUNT] << ncont) + (1 << ncont), &irq);
     r->now[COUNT] = n;

     ldebug ("dma_pos %d irq %d size %d\n",
             n, irq, (r->base[1] << ncont) + (1 << ncont));

     if (-1 != irq) {
         pic_set_irq (irq, 1);
     }
 }

 void DMA_run (void)
 {
     static int in_dma;
     struct dma_cont *d;
     int icont, ichan;

     if (in_dma) {
         log ("attempt to re-enter dma\n");
         return;
     }

     in_dma = 1;
     d = dma_controllers;

     for (icont = 0; icont < 2; icont++, d++) {
         for (ichan = 0; ichan < 4; ichan++) {
             int mask;

             mask = 1 << ichan;

             if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4))))
                 channel_run (icont, ichan);
         }
     }
     in_dma = 0;
 }

 void DMA_register_channel (int nchan,
                            DMA_read_handler read_handler,
                            DMA_misc_handler misc_handler)
 {
     struct dma_regs *r;
     int ichan, ncont;

     ncont = nchan > 3;
     ichan = nchan & 3;

     r = dma_controllers[ncont].regs + ichan;
     r->read_handler = read_handler;
     r->misc_handler = misc_handler;
 }

 void DMA_init (void)
 {
     int i;
     int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };

     for (i = 0; i < 8; i++) {
         register_ioport_write (i, 1, write_chan, 1);

         register_ioport_write (0xc0 + (i << 1), 1, write_chan, 1);

         register_ioport_read (i, 1, read_chan, 1);
         register_ioport_read (0xc0 + (i << 1), 1, read_chan, 1);
     }

     for (i = 0; i < LENOFA (page_port_list); i++) {
         register_ioport_write (page_port_list[i] + 0x80, 1, write_page, 1);
         register_ioport_write (page_port_list[i] + 0x88, 1, write_page, 1);
     }

     for (i = 0; i < 8; i++) {
         register_ioport_write (i + 8, 1, write_cont, 1);
         register_ioport_write (0xd0 + (i << 1), 1, write_cont, 1);
     }

     write_cont (NULL, 0x0d, 0);
     write_cont (NULL, 0xda, 0);
 }
	/*
	* QEMU DMA emulation
	*
	* Copyright (c) 2003 Vassili Karpov (malc)
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include <stdio.h>
	#include <stdlib.h>
	#include <inttypes.h>

	#include "cpu.h"
	#include "vl.h"

	#define log(...) fprintf (stderr, "dma: " __VA_ARGS__)
	#ifdef DEBUG_DMA
	#define lwarn(...) fprintf (stderr, "dma: " __VA_ARGS__)
	#define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
	#define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
	#else
	#define lwarn(...)
	#define linfo(...)
	#define ldebug(...)
	#endif

	#define MEM_REAL(addr) ((addr)+(uint32_t)(phys_ram_base))
	#define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))

	struct dma_regs {
	int now[2];
	uint16_t base[2];
	uint8_t mode;
	uint8_t page;
	uint8_t dack;
	uint8_t eop;
	DMA_read_handler read_handler;
	DMA_misc_handler misc_handler;
	};

	#define ADDR 0
	#define COUNT 1

	static struct dma_cont {
	uint8_t status;
	uint8_t command;
	uint8_t mask;
	uint8_t flip_flop;
	struct dma_regs regs[4];
	} dma_controllers[2];

	enum {
	CMD_MEMORY_TO_MEMORY = 0x01,
	CMD_FIXED_ADDRESS = 0x02,
	CMD_BLOCK_CONTROLLER = 0x04,
	CMD_COMPRESSED_TIME = 0x08,
	CMD_CYCLIC_PRIORITY = 0x10,
	CMD_EXTENDED_WRITE = 0x20,
	CMD_LOW_DREQ = 0x40,
	CMD_LOW_DACK = 0x80,
	CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY \| CMD_FIXED_ADDRESS
	\| CMD_COMPRESSED_TIME \| CMD_CYCLIC_PRIORITY \| CMD_EXTENDED_WRITE
	\| CMD_LOW_DREQ \| CMD_LOW_DACK

	};

	static void write_page (CPUState *env, uint32_t nport, uint32_t data)
	{
	int ichan;
	int ncont;
	static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};

	ncont = nport > 0x87;
	ichan = channels[nport - 0x80 - (ncont << 3)];

	if (-1 == ichan) {
	log ("invalid channel %#x %#x\n", nport, data);
	return;
	}

	dma_controllers[ncont].regs[ichan].page = data;
	}

	static void init_chan (int ncont, int ichan)
	{
	struct dma_regs *r;

	r = dma_controllers[ncont].regs + ichan;
	r->now[ADDR] = r->base[0] << ncont;
	r->now[COUNT] = 0;
	}

	static inline int getff (int ncont)
	{
	int ff;

	ff = dma_controllers[ncont].flip_flop;
	dma_controllers[ncont].flip_flop = !ff;
	return ff;
	}

	static uint32_t read_chan (CPUState *env, uint32_t nport)
	{
	int ff;
	int ncont, ichan, nreg;
	struct dma_regs *r;
	int val;

	ncont = nport > 7;
	ichan = (nport >> (1 + ncont)) & 3;
	nreg = (nport >> ncont) & 1;
	r = dma_controllers[ncont].regs + ichan;

	ff = getff (ncont);

	if (nreg)
	val = (r->base[COUNT] << ncont) - r->now[COUNT];
	else
	val = r->now[ADDR] + r->now[COUNT];

	return (val >> (ncont + (ff << 3))) & 0xff;
	}

	static void write_chan (CPUState *env, uint32_t nport, uint32_t data)
	{
	int ncont, ichan, nreg;
	struct dma_regs *r;

	ncont = nport > 7;
	ichan = (nport >> (1 + ncont)) & 3;
	nreg = (nport >> ncont) & 1;
	r = dma_controllers[ncont].regs + ichan;

	if (getff (ncont)) {
	r->base[nreg] = (r->base[nreg] & 0xff) \| ((data << 8) & 0xff00);
	init_chan (ncont, ichan);
	} else {
	r->base[nreg] = (r->base[nreg] & 0xff00) \| (data & 0xff);
	}
	}

	static void write_cont (CPUState *env, uint32_t nport, uint32_t data)
	{
	int iport, ichan, ncont;
	struct dma_cont *d;

	ncont = nport > 0xf;
	ichan = -1;

	d = dma_controllers + ncont;
	if (ncont) {
	iport = ((nport - 0xd0) >> 1) + 8;
	}
	else {
	iport = nport;
	}

	switch (iport) {
	case 8: /* command */
	if (data && (data \| CMD_NOT_SUPPORTED)) {
	log ("command %#x not supported\n", data);
	goto error;
	}
	d->command = data;
	break;

	case 9:
	ichan = data & 3;
	if (data & 4) {
	d->status \|= 1 << (ichan + 4);
	}
	else {
	d->status &= ~(1 << (ichan + 4));
	}
	d->status &= ~(1 << ichan);
	break;

	case 0xa: /* single mask */
	if (data & 4)
	d->mask \|= 1 << (data & 3);
	else
	d->mask &= ~(1 << (data & 3));
	break;

	case 0xb: /* mode */
	{
	ichan = data & 3;
	#ifdef DEBUG_DMA
	int op;
	int ai;
	int dir;
	int opmode;

	op = (data >> 2) & 3;
	ai = (data >> 4) & 1;
	dir = (data >> 5) & 1;
	opmode = (data >> 6) & 3;

	linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
	ichan, op, ai, dir, opmode);
	#endif

	d->regs[ichan].mode = data;
	break;
	}

	case 0xc: /* clear flip flop */
	d->flip_flop = 0;
	break;

	case 0xd: /* reset */
	d->flip_flop = 0;
	d->mask = ~0;
	d->status = 0;
	d->command = 0;
	break;

	case 0xe: /* clear mask for all channels */
	d->mask = 0;
	break;

	case 0xf: /* write mask for all channels */
	d->mask = data;
	break;

	default:
	log ("dma: unknown iport %#x\n", iport);
	goto error;
	}

	#ifdef DEBUG_DMA
	if (0xc != iport) {
	linfo ("nport %#06x, ncont %d, ichan % 2d, val %#06x\n",
	nport, d != dma_controllers, ichan, data);
	}
	#endif
	return;

	error:
	abort ();
	}

	int DMA_get_channel_mode (int nchan)
	{
	return dma_controllers[nchan > 3].regs[nchan & 3].mode;
	}

	void DMA_hold_DREQ (int nchan)
	{
	int ncont, ichan;

	ncont = nchan > 3;
	ichan = nchan & 3;
	linfo ("held cont=%d chan=%d\n", ncont, ichan);
	dma_controllers[ncont].status \|= 1 << (ichan + 4);
	}

	void DMA_release_DREQ (int nchan)
	{
	int ncont, ichan;

	ncont = nchan > 3;
	ichan = nchan & 3;
	linfo ("released cont=%d chan=%d\n", ncont, ichan);
	dma_controllers[ncont].status &= ~(1 << (ichan + 4));
	}

	static void channel_run (int ncont, int ichan)
	{
	struct dma_regs *r;
	int n;
	int irq;
	uint32_t addr;
	/* int ai, dir; */

	r = dma_controllers[ncont].regs + ichan;
	/* ai = r->mode & 16; */
	/* dir = r->mode & 32 ? -1 : 1; */

	addr = MEM_REAL ((r->page << 16) \| r->now[ADDR]);

	irq = -1;
	n = r->read_handler (addr, (r->base[COUNT] << ncont) + (1 << ncont), &irq);
	r->now[COUNT] = n;

	ldebug ("dma_pos %d irq %d size %d\n",
	n, irq, (r->base[1] << ncont) + (1 << ncont));

	if (-1 != irq) {
	pic_set_irq (irq, 1);
	}
	}

	void DMA_run (void)
	{
	static int in_dma;
	struct dma_cont *d;
	int icont, ichan;

	if (in_dma) {
	log ("attempt to re-enter dma\n");
	return;
	}

	in_dma = 1;
	d = dma_controllers;

	for (icont = 0; icont < 2; icont++, d++) {
	for (ichan = 0; ichan < 4; ichan++) {
	int mask;

	mask = 1 << ichan;

	if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4))))
	channel_run (icont, ichan);
	}
	}
	in_dma = 0;
	}

	void DMA_register_channel (int nchan,
	DMA_read_handler read_handler,
	DMA_misc_handler misc_handler)
	{
	struct dma_regs *r;
	int ichan, ncont;

	ncont = nchan > 3;
	ichan = nchan & 3;

	r = dma_controllers[ncont].regs + ichan;
	r->read_handler = read_handler;
	r->misc_handler = misc_handler;
	}

	void DMA_init (void)
	{
	int i;
	int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };

	for (i = 0; i < 8; i++) {
	register_ioport_write (i, 1, write_chan, 1);

	register_ioport_write (0xc0 + (i << 1), 1, write_chan, 1);

	register_ioport_read (i, 1, read_chan, 1);
	register_ioport_read (0xc0 + (i << 1), 1, read_chan, 1);
	}

	for (i = 0; i < LENOFA (page_port_list); i++) {
	register_ioport_write (page_port_list[i] + 0x80, 1, write_page, 1);
	register_ioport_write (page_port_list[i] + 0x88, 1, write_page, 1);
	}

	for (i = 0; i < 8; i++) {
	register_ioport_write (i + 8, 1, write_cont, 1);
	register_ioport_write (0xd0 + (i << 1), 1, write_cont, 1);
	}

	write_cont (NULL, 0x0d, 0);
	write_cont (NULL, 0xda, 0);
	}