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qemu-e2k/hw/net/mipsnet.c
Richard Henderson 1de81b426c hw/net: Constify VMState 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-42-richard.henderson@linaro.org>
2023-12-30 07:38:06 +11:00

299 lines
7.9 KiB
C
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#include "qemu/osdep.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "net/net.h"
#include "qemu/module.h"
#include "trace.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qom/object.h"
/* MIPSnet register offsets */
#define MIPSNET_DEV_ID 0x00
#define MIPSNET_BUSY 0x08
#define MIPSNET_RX_DATA_COUNT 0x0c
#define MIPSNET_TX_DATA_COUNT 0x10
#define MIPSNET_INT_CTL 0x14
# define MIPSNET_INTCTL_TXDONE 0x00000001
# define MIPSNET_INTCTL_RXDONE 0x00000002
# define MIPSNET_INTCTL_TESTBIT 0x80000000
#define MIPSNET_INTERRUPT_INFO 0x18
#define MIPSNET_RX_DATA_BUFFER 0x1c
#define MIPSNET_TX_DATA_BUFFER 0x20
#define MAX_ETH_FRAME_SIZE 1514
#define TYPE_MIPS_NET "mipsnet"
OBJECT_DECLARE_SIMPLE_TYPE(MIPSnetState, MIPS_NET)
struct MIPSnetState {
SysBusDevice parent_obj;
uint32_t busy;
uint32_t rx_count;
uint32_t rx_read;
uint32_t tx_count;
uint32_t tx_written;
uint32_t intctl;
uint8_t rx_buffer[MAX_ETH_FRAME_SIZE];
uint8_t tx_buffer[MAX_ETH_FRAME_SIZE];
MemoryRegion io;
qemu_irq irq;
NICState *nic;
NICConf conf;
};
static void mipsnet_reset(MIPSnetState *s)
{
s->busy = 1;
s->rx_count = 0;
s->rx_read = 0;
s->tx_count = 0;
s->tx_written = 0;
s->intctl = 0;
memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE);
memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE);
}
static void mipsnet_update_irq(MIPSnetState *s)
{
int isr = !!s->intctl;
trace_mipsnet_irq(isr, s->intctl);
qemu_set_irq(s->irq, isr);
}
static int mipsnet_buffer_full(MIPSnetState *s)
{
if (s->rx_count >= MAX_ETH_FRAME_SIZE) {
return 1;
}
return 0;
}
static int mipsnet_can_receive(NetClientState *nc)
{
MIPSnetState *s = qemu_get_nic_opaque(nc);
if (s->busy) {
return 0;
}
return !mipsnet_buffer_full(s);
}
static ssize_t mipsnet_receive(NetClientState *nc,
const uint8_t *buf, size_t size)
{
MIPSnetState *s = qemu_get_nic_opaque(nc);
trace_mipsnet_receive(size);
if (!mipsnet_can_receive(nc)) {
return 0;
}
if (size >= sizeof(s->rx_buffer)) {
return 0;
}
s->busy = 1;
/* Just accept everything. */
/* Write packet data. */
memcpy(s->rx_buffer, buf, size);
s->rx_count = size;
s->rx_read = 0;
/* Now we can signal we have received something. */
s->intctl |= MIPSNET_INTCTL_RXDONE;
mipsnet_update_irq(s);
return size;
}
static uint64_t mipsnet_ioport_read(void *opaque, hwaddr addr,
unsigned int size)
{
MIPSnetState *s = opaque;
int ret = 0;
addr &= 0x3f;
switch (addr) {
case MIPSNET_DEV_ID:
ret = be32_to_cpu(0x4d495053); /* MIPS */
break;
case MIPSNET_DEV_ID + 4:
ret = be32_to_cpu(0x4e455430); /* NET0 */
break;
case MIPSNET_BUSY:
ret = s->busy;
break;
case MIPSNET_RX_DATA_COUNT:
ret = s->rx_count;
break;
case MIPSNET_TX_DATA_COUNT:
ret = s->tx_count;
break;
case MIPSNET_INT_CTL:
ret = s->intctl;
s->intctl &= ~MIPSNET_INTCTL_TESTBIT;
break;
case MIPSNET_INTERRUPT_INFO:
/* XXX: This seems to be a per-VPE interrupt number. */
ret = 0;
break;
case MIPSNET_RX_DATA_BUFFER:
if (s->rx_count) {
s->rx_count--;
ret = s->rx_buffer[s->rx_read++];
if (mipsnet_can_receive(s->nic->ncs)) {
qemu_flush_queued_packets(qemu_get_queue(s->nic));
}
}
break;
/* Reads as zero. */
case MIPSNET_TX_DATA_BUFFER:
default:
break;
}
trace_mipsnet_read(addr, ret);
return ret;
}
static void mipsnet_ioport_write(void *opaque, hwaddr addr,
uint64_t val, unsigned int size)
{
MIPSnetState *s = opaque;
addr &= 0x3f;
trace_mipsnet_write(addr, val);
switch (addr) {
case MIPSNET_TX_DATA_COUNT:
s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0;
s->tx_written = 0;
break;
case MIPSNET_INT_CTL:
if (val & MIPSNET_INTCTL_TXDONE) {
s->intctl &= ~MIPSNET_INTCTL_TXDONE;
} else if (val & MIPSNET_INTCTL_RXDONE) {
s->intctl &= ~MIPSNET_INTCTL_RXDONE;
} else if (val & MIPSNET_INTCTL_TESTBIT) {
mipsnet_reset(s);
s->intctl |= MIPSNET_INTCTL_TESTBIT;
} else if (!val) {
/* ACK testbit interrupt, flag was cleared on read. */
}
s->busy = !!s->intctl;
mipsnet_update_irq(s);
if (mipsnet_can_receive(s->nic->ncs)) {
qemu_flush_queued_packets(qemu_get_queue(s->nic));
}
break;
case MIPSNET_TX_DATA_BUFFER:
s->tx_buffer[s->tx_written++] = val;
if ((s->tx_written >= MAX_ETH_FRAME_SIZE)
|| (s->tx_written == s->tx_count)) {
/* Send buffer. */
trace_mipsnet_send(s->tx_written);
qemu_send_packet(qemu_get_queue(s->nic),
s->tx_buffer, s->tx_written);
s->tx_count = s->tx_written = 0;
s->intctl |= MIPSNET_INTCTL_TXDONE;
s->busy = 1;
mipsnet_update_irq(s);
}
break;
/* Read-only registers */
case MIPSNET_DEV_ID:
case MIPSNET_BUSY:
case MIPSNET_RX_DATA_COUNT:
case MIPSNET_INTERRUPT_INFO:
case MIPSNET_RX_DATA_BUFFER:
default:
break;
}
}
static const VMStateDescription vmstate_mipsnet = {
.name = "mipsnet",
.version_id = 0,
.minimum_version_id = 0,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(busy, MIPSnetState),
VMSTATE_UINT32(rx_count, MIPSnetState),
VMSTATE_UINT32(rx_read, MIPSnetState),
VMSTATE_UINT32(tx_count, MIPSnetState),
VMSTATE_UINT32(tx_written, MIPSnetState),
VMSTATE_UINT32(intctl, MIPSnetState),
VMSTATE_BUFFER(rx_buffer, MIPSnetState),
VMSTATE_BUFFER(tx_buffer, MIPSnetState),
VMSTATE_END_OF_LIST()
}
};
static NetClientInfo net_mipsnet_info = {
.type = NET_CLIENT_DRIVER_NIC,
.size = sizeof(NICState),
.receive = mipsnet_receive,
};
static const MemoryRegionOps mipsnet_ioport_ops = {
.read = mipsnet_ioport_read,
.write = mipsnet_ioport_write,
.impl.min_access_size = 1,
.impl.max_access_size = 4,
};
static void mipsnet_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
MIPSnetState *s = MIPS_NET(dev);
memory_region_init_io(&s->io, OBJECT(dev), &mipsnet_ioport_ops, s,
"mipsnet-io", 36);
sysbus_init_mmio(sbd, &s->io);
sysbus_init_irq(sbd, &s->irq);
s->nic = qemu_new_nic(&net_mipsnet_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->id,
&dev->mem_reentrancy_guard, s);
qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
}
static void mipsnet_sysbus_reset(DeviceState *dev)
{
MIPSnetState *s = MIPS_NET(dev);
mipsnet_reset(s);
}
static Property mipsnet_properties[] = {
DEFINE_NIC_PROPERTIES(MIPSnetState, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void mipsnet_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = mipsnet_realize;
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
dc->desc = "MIPS Simulator network device";
dc->reset = mipsnet_sysbus_reset;
dc->vmsd = &vmstate_mipsnet;
device_class_set_props(dc, mipsnet_properties);
}
static const TypeInfo mipsnet_info = {
.name = TYPE_MIPS_NET,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MIPSnetState),
.class_init = mipsnet_class_init,
};
static void mipsnet_register_types(void)
{
type_register_static(&mipsnet_info);
}
type_init(mipsnet_register_types)
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