/*
* Copyright (c) 2009 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup bd
* @{
*/
/**
* @file
* @brief GXemul disk driver
*/
#include <stdio.h>
#include <libarch/ddi.h>
#include <ddi.h>
#include <ipc/ipc.h>
#include <ipc/bd.h>
#include <async.h>
#include <as.h>
#include <futex.h>
#include <devmap.h>
#include <sys/types.h>
#include <errno.h>
#define NAME "gxe_bd"
enum {
CTL_READ_START = 0,
CTL_WRITE_START = 1,
};
enum {
STATUS_FAILURE = 0
};
typedef struct {
uint32_t offset_lo;
uint32_t pad0;
uint32_t offset_hi;
uint32_t pad1;
uint32_t disk_id;
uint32_t pad2[3];
uint32_t control;
uint32_t pad3[3];
uint32_t status;
uint32_t pad4[3];
uint8_t pad5[0x3fc0];
uint8_t buffer[512];
} gxe_bd_t;
static const size_t block_size = 512;
static size_t comm_size;
static uintptr_t dev_physical = 0x13000000;
static gxe_bd_t *dev;
static uint32_t disk_id = 0;
static atomic_t dev_futex = FUTEX_INITIALIZER;
static int gxe_bd_init(void);
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
static int gx_bd_rdwr(ipcarg_t method, off_t offset, off_t size, void *buf);
static int gxe_bd_read_block(uint64_t offset, size_t size, void *buf);
static int gxe_bd_write_block(uint64_t offset, size_t size, const void *buf);
int main(int argc, char **argv)
{
printf(NAME
": GXemul disk driver\n");
if (gxe_bd_init() != EOK)
return -1;
printf(NAME
": Accepting connections\n"); async_manager();
/* Not reached */
return 0;
}
static int gxe_bd_init(void)
{
dev_handle_t dev_handle;
void *vaddr;
int rc;
rc = devmap_driver_register(NAME, gxe_bd_connection);
if (rc < 0) {
printf(NAME
": Unable to register driver.\n"); return rc;
}
rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
if (rc != EOK) {
printf(NAME
": Could not initialize device I/O space.\n"); return rc;
}
dev = vaddr;
rc = devmap_device_register("disk0", &dev_handle);
if (rc != EOK) {
devmap_hangup_phone(DEVMAP_DRIVER);
printf(NAME
": Unable to register device.\n"); return rc;
}
return EOK;
}
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
{
void *fs_va = NULL;
ipc_callid_t callid;
ipc_call_t call;
ipcarg_t method;
int flags;
int retval;
off_t idx;
off_t size;
/* Answer the IPC_M_CONNECT_ME_TO call. */
ipc_answer_0(iid, EOK);
if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
ipc_answer_0(callid, EHANGUP);
return;
}
fs_va = as_get_mappable_page(comm_size);
if (fs_va == NULL) {
ipc_answer_0(callid, EHANGUP);
return;
}
(void) ipc_share_out_finalize(callid, fs_va);
while (1) {
callid = async_get_call(&call);
method = IPC_GET_METHOD(call);
switch (method) {
case IPC_M_PHONE_HUNGUP:
/* The other side has hung up. */
ipc_answer_0(callid, EOK);
return;
case BD_READ_BLOCK:
case BD_WRITE_BLOCK:
idx = IPC_GET_ARG1(call);
size = IPC_GET_ARG2(call);
if (size > comm_size) {
retval = EINVAL;
break;
}
retval = gx_bd_rdwr(method, idx * size, size, fs_va);
break;
default:
retval = EINVAL;
break;
}
ipc_answer_0(callid, retval);
}
}
static int gx_bd_rdwr(ipcarg_t method, off_t offset, off_t size, void *buf)
{
int rc;
size_t now;
while (size > 0) {
now = size < block_size ? size : block_size;
if (method == BD_READ_BLOCK)
rc = gxe_bd_read_block(offset, now, buf);
else
rc = gxe_bd_write_block(offset, now, buf);
if (rc != EOK)
return rc;
buf += block_size;
offset += block_size;
if (size > block_size)
size -= block_size;
else
size = 0;
}
return EOK;
}
static int gxe_bd_read_block(uint64_t offset, size_t size, void *buf)
{
uint32_t status;
size_t i;
uint32_t w;
futex_down(&dev_futex);
pio_write_32(&dev->offset_lo, (uint32_t) offset);
pio_write_32(&dev->offset_hi, offset >> 32);
pio_write_32(&dev->disk_id, disk_id);
pio_write_32(&dev->control, CTL_READ_START);
status = pio_read_32(&dev->status);
if (status == STATUS_FAILURE) {
return EIO;
}
for (i = 0; i < size; i++) {
((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
}
futex_up(&dev_futex);
return EOK;
}
static int gxe_bd_write_block(uint64_t offset, size_t size, const void *buf)
{
uint32_t status;
size_t i;
uint32_t w;
for (i = 0; i < size; i++) {
pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
}
futex_down(&dev_futex);
pio_write_32(&dev->offset_lo, (uint32_t) offset);
pio_write_32(&dev->offset_hi, offset >> 32);
pio_write_32(&dev->disk_id, disk_id);
pio_write_32(&dev->control, CTL_WRITE_START);
status = pio_read_32(&dev->status);
if (status == STATUS_FAILURE) {
return EIO;
}
futex_up(&dev_futex);
return EOK;
}
/**
* @}
*/