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ioport.c
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/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* 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.
*/
/*
* splitted out ioport related stuffs from vl.c.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "exec/ioport.h"
#include "trace-root.h"
#include "exec/memory.h"
#include "exec/address-spaces.h"
typedef struct MemoryRegionPortioList {
MemoryRegion mr;
void *portio_opaque;
MemoryRegionPortio ports[];
} MemoryRegionPortioList;
static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
{
return -1ULL;
}
static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
}
const MemoryRegionOps unassigned_io_ops = {
.read = unassigned_io_read,
.write = unassigned_io_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
void cpu_outb(uint32_t addr, uint8_t val)
{
trace_cpu_out(addr, 'b', val);
address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
&val, 1);
}
void cpu_outw(uint32_t addr, uint16_t val)
{
uint8_t buf[2];
trace_cpu_out(addr, 'w', val);
stw_p(buf, val);
address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
buf, 2);
}
void cpu_outl(uint32_t addr, uint32_t val)
{
uint8_t buf[4];
trace_cpu_out(addr, 'l', val);
stl_p(buf, val);
address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
buf, 4);
}
uint8_t cpu_inb(uint32_t addr)
{
uint8_t val;
address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
&val, 1);
trace_cpu_in(addr, 'b', val);
return val;
}
uint16_t cpu_inw(uint32_t addr)
{
uint8_t buf[2];
uint16_t val;
address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 2);
val = lduw_p(buf);
trace_cpu_in(addr, 'w', val);
return val;
}
uint32_t cpu_inl(uint32_t addr)
{
uint8_t buf[4];
uint32_t val;
address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 4);
val = ldl_p(buf);
trace_cpu_in(addr, 'l', val);
return val;
}
void portio_list_init(PortioList *piolist,
Object *owner,
const MemoryRegionPortio *callbacks,
void *opaque, const char *name)
{
unsigned n = 0;
while (callbacks[n].size) {
++n;
}
piolist->ports = callbacks;
piolist->nr = 0;
piolist->regions = g_new0(MemoryRegion *, n);
piolist->address_space = NULL;
piolist->opaque = opaque;
piolist->owner = owner;
piolist->name = name;
piolist->flush_coalesced_mmio = false;
}
void portio_list_set_flush_coalesced(PortioList *piolist)
{
piolist->flush_coalesced_mmio = true;
}
void portio_list_destroy(PortioList *piolist)
{
MemoryRegionPortioList *mrpio;
unsigned i;
for (i = 0; i < piolist->nr; ++i) {
mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
object_unparent(OBJECT(&mrpio->mr));
g_free(mrpio);
}
g_free(piolist->regions);
}
static const MemoryRegionPortio *find_portio(MemoryRegionPortioList *mrpio,
uint64_t offset, unsigned size,
bool write)
{
const MemoryRegionPortio *mrp;
for (mrp = mrpio->ports; mrp->size; ++mrp) {
if (offset >= mrp->offset && offset < mrp->offset + mrp->len &&
size == mrp->size &&
(write ? (bool)mrp->write : (bool)mrp->read)) {
return mrp;
}
}
return NULL;
}
static uint64_t portio_read(void *opaque, hwaddr addr, unsigned size)
{
MemoryRegionPortioList *mrpio = opaque;
const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, false);
uint64_t data;
data = ((uint64_t)1 << (size * 8)) - 1;
if (mrp) {
data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
} else if (size == 2) {
mrp = find_portio(mrpio, addr, 1, false);
if (mrp) {
data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
if (addr + 1 < mrp->offset + mrp->len) {
data |= mrp->read(mrpio->portio_opaque, mrp->base + addr + 1) << 8;
} else {
data |= 0xff00;
}
}
}
return data;
}
static void portio_write(void *opaque, hwaddr addr, uint64_t data,
unsigned size)
{
MemoryRegionPortioList *mrpio = opaque;
const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, true);
if (mrp) {
mrp->write(mrpio->portio_opaque, mrp->base + addr, data);
} else if (size == 2) {
mrp = find_portio(mrpio, addr, 1, true);
if (mrp) {
mrp->write(mrpio->portio_opaque, mrp->base + addr, data & 0xff);
if (addr + 1 < mrp->offset + mrp->len) {
mrp->write(mrpio->portio_opaque, mrp->base + addr + 1, data >> 8);
}
}
}
}
static const MemoryRegionOps portio_ops = {
.read = portio_read,
.write = portio_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid.unaligned = true,
.impl.unaligned = true,
};
static void portio_list_add_1(PortioList *piolist,
const MemoryRegionPortio *pio_init,
unsigned count, unsigned start,
unsigned off_low, unsigned off_high)
{
MemoryRegionPortioList *mrpio;
unsigned i;
/* Copy the sub-list and null-terminate it. */
mrpio = g_malloc0(sizeof(MemoryRegionPortioList) +
sizeof(MemoryRegionPortio) * (count + 1));
mrpio->portio_opaque = piolist->opaque;
memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
/* Adjust the offsets to all be zero-based for the region. */
for (i = 0; i < count; ++i) {
mrpio->ports[i].offset -= off_low;
mrpio->ports[i].base = start + off_low;
}
memory_region_init_io(&mrpio->mr, piolist->owner, &portio_ops, mrpio,
piolist->name, off_high - off_low);
if (piolist->flush_coalesced_mmio) {
memory_region_set_flush_coalesced(&mrpio->mr);
}
memory_region_add_subregion(piolist->address_space,
start + off_low, &mrpio->mr);
piolist->regions[piolist->nr] = &mrpio->mr;
++piolist->nr;
}
void portio_list_add(PortioList *piolist,
MemoryRegion *address_space,
uint32_t start)
{
const MemoryRegionPortio *pio, *pio_start = piolist->ports;
unsigned int off_low, off_high, off_last, count;
piolist->address_space = address_space;
/* Handle the first entry specially. */
off_last = off_low = pio_start->offset;
off_high = off_low + pio_start->len + pio_start->size - 1;
count = 1;
for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
/* All entries must be sorted by offset. */
assert(pio->offset >= off_last);
off_last = pio->offset;
/* If we see a hole, break the region. */
if (off_last > off_high) {
portio_list_add_1(piolist, pio_start, count, start, off_low,
off_high);
/* ... and start collecting anew. */
pio_start = pio;
off_low = off_last;
off_high = off_low + pio->len + pio_start->size - 1;
count = 0;
} else if (off_last + pio->len > off_high) {
off_high = off_last + pio->len + pio_start->size - 1;
}
}
/* There will always be an open sub-list. */
portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
}
void portio_list_del(PortioList *piolist)
{
MemoryRegionPortioList *mrpio;
unsigned i;
for (i = 0; i < piolist->nr; ++i) {
mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
memory_region_del_subregion(piolist->address_space, &mrpio->mr);
}
}