softmmu/ioport.c - third_party/qemu - Git at Google

 /*
  * 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 "cpu.h"
 #include "exec/ioport.h"
 #include "exec/memory.h"
 #include "exec/address-spaces.h"
 #include "trace.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);
     }
 }
	/*
	* 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 "cpu.h"
	#include "exec/ioport.h"
	#include "exec/memory.h"
	#include "exec/address-spaces.h"
	#include "trace.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);
	}
	}