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/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "qemu_file.h"
#include "qemu-char.h"
#include "goldfish_device.h"
#ifdef TARGET_I386
#include "kvm.h"
#endif
enum {
TTY_PUT_CHAR = 0x00,
TTY_BYTES_READY = 0x04,
TTY_CMD = 0x08,
TTY_DATA_PTR = 0x10,
TTY_DATA_LEN = 0x14,
TTY_CMD_INT_DISABLE = 0,
TTY_CMD_INT_ENABLE = 1,
TTY_CMD_WRITE_BUFFER = 2,
TTY_CMD_READ_BUFFER = 3,
};
struct tty_state {
struct goldfish_device dev;
CharDriverState *cs;
uint32_t ptr;
uint32_t ptr_len;
uint32_t ready;
uint8_t data[128];
uint32_t data_count;
};
#define GOLDFISH_TTY_SAVE_VERSION 1
static void goldfish_tty_save(QEMUFile* f, void* opaque)
{
struct tty_state* s = opaque;
qemu_put_be32( f, s->ptr );
qemu_put_be32( f, s->ptr_len );
qemu_put_byte( f, s->ready );
qemu_put_byte( f, s->data_count );
qemu_put_buffer( f, s->data, s->data_count );
}
static int goldfish_tty_load(QEMUFile* f, void* opaque, int version_id)
{
struct tty_state* s = opaque;
if (version_id != GOLDFISH_TTY_SAVE_VERSION)
return -1;
s->ptr = qemu_get_be32(f);
s->ptr_len = qemu_get_be32(f);
s->ready = qemu_get_byte(f);
s->data_count = qemu_get_byte(f);
qemu_get_buffer(f, s->data, s->data_count);
return 0;
}
static uint32_t goldfish_tty_read(void *opaque, target_phys_addr_t offset)
{
struct tty_state *s = (struct tty_state *)opaque;
//printf("goldfish_tty_read %x %x\n", offset, size);
switch (offset) {
case TTY_BYTES_READY:
return s->data_count;
default:
cpu_abort (cpu_single_env, "goldfish_tty_read: Bad offset %x\n", offset);
return 0;
}
}
static void goldfish_tty_write(void *opaque, target_phys_addr_t offset, uint32_t value)
{
struct tty_state *s = (struct tty_state *)opaque;
//printf("goldfish_tty_read %x %x %x\n", offset, value, size);
switch(offset) {
case TTY_PUT_CHAR: {
uint8_t ch = value;
if(s->cs)
qemu_chr_write(s->cs, &ch, 1);
} break;
case TTY_CMD:
switch(value) {
case TTY_CMD_INT_DISABLE:
if(s->ready) {
if(s->data_count > 0)
goldfish_device_set_irq(&s->dev, 0, 0);
s->ready = 0;
}
break;
case TTY_CMD_INT_ENABLE:
if(!s->ready) {
if(s->data_count > 0)
goldfish_device_set_irq(&s->dev, 0, 1);
s->ready = 1;
}
break;
case TTY_CMD_WRITE_BUFFER:
if(s->cs) {
int len;
target_phys_addr_t buf;
buf = s->ptr;
len = s->ptr_len;
while (len) {
char temp[64];
int to_write = sizeof(temp);
if (to_write > len)
to_write = len;
#ifdef TARGET_I386
if (kvm_enabled())
cpu_synchronize_state(cpu_single_env, 0);
#endif
cpu_memory_rw_debug(cpu_single_env, buf, (uint8_t*)temp, to_write, 0);
qemu_chr_write(s->cs, (const uint8_t*)temp, to_write);
buf += to_write;
len -= to_write;
}
//printf("goldfish_tty_write: got %d bytes from %x\n", s->ptr_len, s->ptr);
}
break;
case TTY_CMD_READ_BUFFER:
if(s->ptr_len > s->data_count)
cpu_abort (cpu_single_env, "goldfish_tty_write: reading more data than available %d %d\n", s->ptr_len, s->data_count);
#ifdef TARGET_I386
if (kvm_enabled())
cpu_synchronize_state(cpu_single_env, 0);
#endif
cpu_memory_rw_debug(cpu_single_env,s->ptr, s->data, s->ptr_len,1);
//printf("goldfish_tty_write: read %d bytes to %x\n", s->ptr_len, s->ptr);
if(s->data_count > s->ptr_len)
memmove(s->data, s->data + s->ptr_len, s->data_count - s->ptr_len);
s->data_count -= s->ptr_len;
if(s->data_count == 0 && s->ready)
goldfish_device_set_irq(&s->dev, 0, 0);
break;
default:
cpu_abort (cpu_single_env, "goldfish_tty_write: Bad command %x\n", value);
};
break;
case TTY_DATA_PTR:
s->ptr = value;
break;
case TTY_DATA_LEN:
s->ptr_len = value;
break;
default:
cpu_abort (cpu_single_env, "goldfish_tty_write: Bad offset %x\n", offset);
}
}
static int tty_can_receive(void *opaque)
{
struct tty_state *s = opaque;
return (sizeof(s->data) - s->data_count);
}
static void tty_receive(void *opaque, const uint8_t *buf, int size)
{
struct tty_state *s = opaque;
memcpy(s->data + s->data_count, buf, size);
s->data_count += size;
if(s->data_count > 0 && s->ready)
goldfish_device_set_irq(&s->dev, 0, 1);
}
static CPUReadMemoryFunc *goldfish_tty_readfn[] = {
goldfish_tty_read,
goldfish_tty_read,
goldfish_tty_read
};
static CPUWriteMemoryFunc *goldfish_tty_writefn[] = {
goldfish_tty_write,
goldfish_tty_write,
goldfish_tty_write
};
int goldfish_tty_add(CharDriverState *cs, int id, uint32_t base, int irq)
{
int ret;
struct tty_state *s;
static int instance_id = 0;
s = qemu_mallocz(sizeof(*s));
s->dev.name = "goldfish_tty";
s->dev.id = id;
s->dev.base = base;
s->dev.size = 0x1000;
s->dev.irq = irq;
s->dev.irq_count = 1;
s->cs = cs;
if(cs) {
qemu_chr_add_handlers(cs, tty_can_receive, tty_receive, NULL, s);
}
ret = goldfish_device_add(&s->dev, goldfish_tty_readfn, goldfish_tty_writefn, s);
if(ret) {
qemu_free(s);
} else {
register_savevm( "goldfish_tty", instance_id++, GOLDFISH_TTY_SAVE_VERSION,
goldfish_tty_save, goldfish_tty_load, s);
}
return ret;
}
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