/*
* QEMU DMA emulation
- *
- * Copyright (c) 2003 Vassili Karpov (malc)
- *
+ *
+ * Copyright (c) 2003-2004 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
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include "vl.h"
+#include "hw.h"
+#include "isa.h"
-//#define DEBUG_DMA
+/* #define DEBUG_DMA */
-#define log(...) fprintf (stderr, "dma: " __VA_ARGS__)
+#define dolog(...) 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 LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))
-
struct dma_regs {
int now[2];
uint16_t base[2];
uint8_t flip_flop;
int dshift;
struct dma_regs regs[4];
+ qemu_irq *cpu_request_exit;
} 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
+ 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 DMA_run (void);
+
static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};
static void write_page (void *opaque, uint32_t nport, uint32_t data)
ichan = channels[nport & 7];
if (-1 == ichan) {
- log ("invalid channel %#x %#x\n", nport, data);
+ dolog ("invalid channel %#x %#x\n", nport, data);
return;
}
d->regs[ichan].page = data;
ichan = channels[nport & 7];
if (-1 == ichan) {
- log ("invalid channel %#x %#x\n", nport, data);
+ dolog ("invalid channel %#x %#x\n", nport, data);
return;
}
d->regs[ichan].pageh = data;
ichan = channels[nport & 7];
if (-1 == ichan) {
- log ("invalid channel read %#x\n", nport);
+ dolog ("invalid channel read %#x\n", nport);
return 0;
}
return d->regs[ichan].page;
ichan = channels[nport & 7];
if (-1 == ichan) {
- log ("invalid channel read %#x\n", nport);
+ dolog ("invalid channel read %#x\n", nport);
return 0;
}
return d->regs[ichan].pageh;
struct dma_regs *r;
r = d->regs + ichan;
- r->now[ADDR] = r->base[0] << d->dshift;
+ r->now[ADDR] = r->base[ADDR] << d->dshift;
r->now[COUNT] = 0;
}
static uint32_t read_chan (void *opaque, uint32_t nport)
{
struct dma_cont *d = opaque;
- int ichan, nreg, iport, ff, val;
+ int ichan, nreg, iport, ff, val, dir;
struct dma_regs *r;
iport = (nport >> d->dshift) & 0x0f;
nreg = iport & 1;
r = d->regs + ichan;
+ dir = ((r->mode >> 5) & 1) ? -1 : 1;
ff = getff (d);
if (nreg)
val = (r->base[COUNT] << d->dshift) - r->now[COUNT];
else
- val = r->now[ADDR] + r->now[COUNT];
+ val = r->now[ADDR] + r->now[COUNT] * dir;
+ ldebug ("read_chan %#x -> %d\n", iport, val);
return (val >> (d->dshift + (ff << 3))) & 0xff;
}
static void write_cont (void *opaque, uint32_t nport, uint32_t data)
{
struct dma_cont *d = opaque;
- int iport, ichan;
+ int iport, ichan = 0;
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
- case 8: /* command */
+ case 0x08: /* command */
if ((data != 0) && (data & CMD_NOT_SUPPORTED)) {
- log ("command %#x not supported\n", data);
+ dolog ("command %#x not supported\n", data);
return;
}
d->command = data;
break;
- case 9:
+ case 0x09:
ichan = data & 3;
if (data & 4) {
d->status |= 1 << (ichan + 4);
d->status &= ~(1 << (ichan + 4));
}
d->status &= ~(1 << ichan);
+ DMA_run();
break;
- case 0xa: /* single mask */
+ case 0x0a: /* single mask */
if (data & 4)
d->mask |= 1 << (data & 3);
else
d->mask &= ~(1 << (data & 3));
+ DMA_run();
break;
- case 0xb: /* mode */
+ case 0x0b: /* 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);
+ {
+ int op, ai, dir, 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 */
+ case 0x0c: /* clear flip flop */
d->flip_flop = 0;
break;
- case 0xd: /* reset */
+ case 0x0d: /* reset */
d->flip_flop = 0;
d->mask = ~0;
d->status = 0;
d->command = 0;
break;
- case 0xe: /* clear mask for all channels */
+ case 0x0e: /* clear mask for all channels */
d->mask = 0;
+ DMA_run();
break;
- case 0xf: /* write mask for all channels */
+ case 0x0f: /* write mask for all channels */
d->mask = data;
+ DMA_run();
break;
default:
- log ("dma: unknown iport %#x\n", iport);
+ dolog ("unknown iport %#x\n", iport);
break;
}
#ifdef DEBUG_DMA
if (0xc != iport) {
- linfo ("nport %#06x, ichan % 2d, val %#06x\n",
+ linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n",
nport, ichan, data);
}
#endif
{
struct dma_cont *d = opaque;
int iport, val;
-
+
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
- case 0x08: /* status */
+ case 0x08: /* status */
val = d->status;
d->status &= 0xf0;
break;
- case 0x0f: /* mask */
+ case 0x0f: /* mask */
val = d->mask;
break;
default:
val = 0;
break;
}
+
+ ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val);
return val;
}
ichan = nchan & 3;
linfo ("held cont=%d chan=%d\n", ncont, ichan);
dma_controllers[ncont].status |= 1 << (ichan + 4);
+ DMA_run();
}
void DMA_release_DREQ (int nchan)
ichan = nchan & 3;
linfo ("released cont=%d chan=%d\n", ncont, ichan);
dma_controllers[ncont].status &= ~(1 << (ichan + 4));
+ DMA_run();
}
static void channel_run (int ncont, int ichan)
{
- struct dma_regs *r;
int n;
- target_ulong addr;
-/* int ai, dir; */
+ struct dma_regs *r = &dma_controllers[ncont].regs[ichan];
+#ifdef DEBUG_DMA
+ int dir, opmode;
- r = dma_controllers[ncont].regs + ichan;
-/* ai = r->mode & 16; */
-/* dir = r->mode & 32 ? -1 : 1; */
+ dir = (r->mode >> 5) & 1;
+ opmode = (r->mode >> 6) & 3;
- /* NOTE: pageh is only used by PPC PREP */
- addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
- n = r->transfer_handler (r->opaque, addr,
- (r->base[COUNT] << ncont) + (1 << ncont));
- r->now[COUNT] = n;
+ if (dir) {
+ dolog ("DMA in address decrement mode\n");
+ }
+ if (opmode != 1) {
+ dolog ("DMA not in single mode select %#x\n", opmode);
+ }
+#endif
- ldebug ("dma_pos %d size %d\n",
- n, (r->base[1] << ncont) + (1 << ncont));
+ n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
+ r->now[COUNT], (r->base[COUNT] + 1) << ncont);
+ r->now[COUNT] = n;
+ ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont);
}
-void DMA_run (void)
+static QEMUBH *dma_bh;
+
+static void DMA_run (void)
{
struct dma_cont *d;
int icont, ichan;
+ int rearm = 0;
d = dma_controllers;
mask = 1 << ichan;
- if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4))))
+ if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) {
channel_run (icont, ichan);
+ rearm = 1;
+ }
}
}
+
+ if (rearm)
+ qemu_bh_schedule_idle(dma_bh);
+}
+
+static void DMA_run_bh(void *unused)
+{
+ DMA_run();
}
void DMA_register_channel (int nchan,
- DMA_transfer_handler transfer_handler,
+ DMA_transfer_handler transfer_handler,
void *opaque)
{
struct dma_regs *r;
r->opaque = opaque;
}
+int DMA_read_memory (int nchan, void *buf, int pos, int len)
+{
+ struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3];
+ target_phys_addr_t addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
+
+ if (r->mode & 0x20) {
+ int i;
+ uint8_t *p = buf;
+
+ cpu_physical_memory_read (addr - pos - len, buf, len);
+ /* What about 16bit transfers? */
+ for (i = 0; i < len >> 1; i++) {
+ uint8_t b = p[len - i - 1];
+ p[i] = b;
+ }
+ }
+ else
+ cpu_physical_memory_read (addr + pos, buf, len);
+
+ return len;
+}
+
+int DMA_write_memory (int nchan, void *buf, int pos, int len)
+{
+ struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3];
+ target_phys_addr_t addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
+
+ if (r->mode & 0x20) {
+ int i;
+ uint8_t *p = buf;
+
+ cpu_physical_memory_write (addr - pos - len, buf, len);
+ /* What about 16bit transfers? */
+ for (i = 0; i < len; i++) {
+ uint8_t b = p[len - i - 1];
+ p[i] = b;
+ }
+ }
+ else
+ cpu_physical_memory_write (addr + pos, buf, len);
+
+ return len;
+}
+
/* request the emulator to transfer a new DMA memory block ASAP */
void DMA_schedule(int nchan)
{
- cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+ struct dma_cont *d = &dma_controllers[nchan > 3];
+
+ qemu_irq_pulse(*d->cpu_request_exit);
}
static void dma_reset(void *opaque)
write_cont (d, (0x0d << d->dshift), 0);
}
+static int dma_phony_handler (void *opaque, int nchan, int dma_pos, int dma_len)
+{
+ dolog ("unregistered DMA channel used nchan=%d dma_pos=%d dma_len=%d\n",
+ nchan, dma_pos, dma_len);
+ return dma_pos;
+}
+
/* dshift = 0: 8 bit DMA, 1 = 16 bit DMA */
-static void dma_init2(struct dma_cont *d, int base, int dshift,
- int page_base, int pageh_base)
+static void dma_init2(struct dma_cont *d, int base, int dshift,
+ int page_base, int pageh_base,
+ qemu_irq *cpu_request_exit)
{
- const static int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };
+ static const int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };
int i;
d->dshift = dshift;
+ d->cpu_request_exit = cpu_request_exit;
for (i = 0; i < 8; i++) {
register_ioport_write (base + (i << dshift), 1, 1, write_chan, d);
register_ioport_read (base + (i << dshift), 1, 1, read_chan, d);
}
- for (i = 0; i < LENOFA (page_port_list); i++) {
- register_ioport_write (page_base + page_port_list[i], 1, 1,
+ for (i = 0; i < ARRAY_SIZE (page_port_list); i++) {
+ register_ioport_write (page_base + page_port_list[i], 1, 1,
write_page, d);
- register_ioport_read (page_base + page_port_list[i], 1, 1,
+ register_ioport_read (page_base + page_port_list[i], 1, 1,
read_page, d);
if (pageh_base >= 0) {
- register_ioport_write (pageh_base + page_port_list[i], 1, 1,
+ register_ioport_write (pageh_base + page_port_list[i], 1, 1,
write_pageh, d);
- register_ioport_read (pageh_base + page_port_list[i], 1, 1,
+ register_ioport_read (pageh_base + page_port_list[i], 1, 1,
read_pageh, d);
}
}
for (i = 0; i < 8; i++) {
- register_ioport_write (base + ((i + 8) << dshift), 1, 1,
+ register_ioport_write (base + ((i + 8) << dshift), 1, 1,
write_cont, d);
- register_ioport_read (base + ((i + 8) << dshift), 1, 1,
+ register_ioport_read (base + ((i + 8) << dshift), 1, 1,
read_cont, d);
}
qemu_register_reset(dma_reset, d);
dma_reset(d);
+ for (i = 0; i < ARRAY_SIZE (d->regs); ++i) {
+ d->regs[i].transfer_handler = dma_phony_handler;
+ }
+}
+
+static const VMStateDescription vmstate_dma_regs = {
+ .name = "dma_regs",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField []) {
+ VMSTATE_INT32_ARRAY(now, struct dma_regs, 2),
+ VMSTATE_UINT16_ARRAY(base, struct dma_regs, 2),
+ VMSTATE_UINT8(mode, struct dma_regs),
+ VMSTATE_UINT8(page, struct dma_regs),
+ VMSTATE_UINT8(pageh, struct dma_regs),
+ VMSTATE_UINT8(dack, struct dma_regs),
+ VMSTATE_UINT8(eop, struct dma_regs),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static int dma_post_load(void *opaque, int version_id)
+{
+ DMA_run();
+
+ return 0;
}
-void DMA_init (int high_page_enable)
+static const VMStateDescription vmstate_dma = {
+ .name = "dma",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .post_load = dma_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT8(command, struct dma_cont),
+ VMSTATE_UINT8(mask, struct dma_cont),
+ VMSTATE_UINT8(flip_flop, struct dma_cont),
+ VMSTATE_INT32(dshift, struct dma_cont),
+ VMSTATE_STRUCT_ARRAY(regs, struct dma_cont, 4, 1, vmstate_dma_regs, struct dma_regs),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit)
{
- dma_init2(&dma_controllers[0], 0x00, 0, 0x80,
- high_page_enable ? 0x480 : -1);
+ dma_init2(&dma_controllers[0], 0x00, 0, 0x80,
+ high_page_enable ? 0x480 : -1, cpu_request_exit);
dma_init2(&dma_controllers[1], 0xc0, 1, 0x88,
- high_page_enable ? 0x488 : -1);
+ high_page_enable ? 0x488 : -1, cpu_request_exit);
+ vmstate_register (NULL, 0, &vmstate_dma, &dma_controllers[0]);
+ vmstate_register (NULL, 1, &vmstate_dma, &dma_controllers[1]);
+
+ dma_bh = qemu_bh_new(DMA_run_bh, NULL);
}
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