Subversion Repositories HelenOS

Compare Revisions

Ignore whitespace Rev 3022 → Rev 4055

/branches/dd/uspace/srv/rd/rd.c
51,8 → 51,12
#include <align.h>
#include <async.h>
#include <futex.h>
#include <stdio.h>
#include <ipc/devmap.h>
#include "rd.h"
 
#define NAME "rd"
 
/** Pointer to the ramdisk's image. */
static void *rd_addr;
/** Size of the ramdisk. */
77,45 → 81,24
ipc_call_t call;
int retval;
void *fs_va = NULL;
ipcarg_t offset;
off_t offset;
size_t block_size;
size_t maxblock_size;
 
/*
* We allocate VA for communication per connection.
* This allows us to potentionally have more clients and work
* concurrently.
* Answer the first IPC_M_CONNECT_ME_TO call.
*/
fs_va = as_get_mappable_page(ALIGN_UP(BLOCK_SIZE, PAGE_SIZE));
if (!fs_va) {
/*
* Hang up the phone if we cannot proceed any further.
* This is the answer to the call that opened the connection.
*/
ipc_answer_0(iid, EHANGUP);
return;
} else {
/*
* Answer the first IPC_M_CONNECT_ME_TO call.
* Return supported block size as ARG1.
*/
ipc_answer_1(iid, EOK, BLOCK_SIZE);
}
ipc_answer_0(iid, EOK);
 
/*
* Now we wait for the client to send us its communication as_area.
*/
size_t size;
if (ipc_share_out_receive(&callid, &size, NULL)) {
if (size >= BLOCK_SIZE) {
/*
* The client sends an as_area that can absorb the whole
* block.
*/
int flags;
if (ipc_share_out_receive(&callid, &maxblock_size, &flags)) {
fs_va = as_get_mappable_page(maxblock_size);
if (fs_va) {
(void) ipc_share_out_finalize(callid, fs_va);
} else {
/*
* The client offered as_area too small.
* Close the connection.
*/
ipc_answer_0(callid, EHANGUP);
return;
}
141,8 → 124,16
return;
case RD_READ_BLOCK:
offset = IPC_GET_ARG1(call);
if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) {
block_size = IPC_GET_ARG2(call);
if (block_size > maxblock_size) {
/*
* Maximum block size exceeded.
*/
retval = ELIMIT;
break;
}
if (offset * block_size > rd_size - block_size) {
/*
* Reading past the end of the device.
*/
retval = ELIMIT;
149,14 → 140,22
break;
}
futex_down(&rd_futex);
memcpy(fs_va, rd_addr + offset, BLOCK_SIZE);
memcpy(fs_va, rd_addr + offset * block_size, block_size);
futex_up(&rd_futex);
retval = EOK;
break;
case RD_WRITE_BLOCK:
offset = IPC_GET_ARG1(call);
if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) {
block_size = IPC_GET_ARG2(call);
if (block_size > maxblock_size) {
/*
* Maximum block size exceeded.
*/
retval = ELIMIT;
break;
}
if (offset * block_size > rd_size - block_size) {
/*
* Writing past the end of the device.
*/
retval = ELIMIT;
163,7 → 162,7
break;
}
futex_up(&rd_futex);
memcpy(rd_addr + offset, fs_va, BLOCK_SIZE);
memcpy(rd_addr + offset * block_size, fs_va, block_size);
futex_down(&rd_futex);
retval = EOK;
break;
181,46 → 180,117
}
}
 
static int driver_register(char *name)
{
ipcarg_t retval;
aid_t req;
ipc_call_t answer;
int phone;
ipcarg_t callback_phonehash;
 
phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP, DEVMAP_DRIVER, 0);
if (phone < 0) {
printf(NAME ": Failed to connect to device mapper\n");
return -1;
}
req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
 
retval = ipc_data_write_start(phone, (char *) name, strlen(name) + 1);
 
if (retval != EOK) {
async_wait_for(req, NULL);
return -1;
}
 
async_set_client_connection(rd_connection);
 
ipc_connect_to_me(phone, 0, 0, 0, &callback_phonehash);
async_wait_for(req, &retval);
 
return phone;
}
 
static int device_register(int driver_phone, char *name, int *handle)
{
ipcarg_t retval;
aid_t req;
ipc_call_t answer;
 
req = async_send_2(driver_phone, DEVMAP_DEVICE_REGISTER, 0, 0, &answer);
 
retval = ipc_data_write_start(driver_phone, (char *) name, strlen(name) + 1);
 
if (retval != EOK) {
async_wait_for(req, NULL);
return retval;
}
 
async_wait_for(req, &retval);
 
if (handle != NULL)
*handle = -1;
if (EOK == retval) {
if (NULL != handle)
*handle = (int) IPC_GET_ARG1(answer);
}
return retval;
}
 
/** Prepare the ramdisk image for operation. */
static bool rd_init(void)
{
int retval, flags;
 
rd_size = sysinfo_value("rd.size");
void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical");
if (rd_size == 0)
if (rd_size == 0) {
printf(NAME ": No RAM disk found\n");
return false;
}
rd_addr = as_get_mappable_page(rd_size);
flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE;
retval = physmem_map(rd_ph_addr, rd_addr,
int flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE;
int retval = physmem_map(rd_ph_addr, rd_addr,
ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags);
 
if (retval < 0)
if (retval < 0) {
printf(NAME ": Error mapping RAM disk\n");
return false;
}
printf(NAME ": Found RAM disk at %p, %d bytes\n", rd_ph_addr, rd_size);
int driver_phone = driver_register(NAME);
if (driver_phone < 0) {
printf(NAME ": Unable to register driver\n");
return false;
}
int dev_handle;
if (EOK != device_register(driver_phone, "initrd", &dev_handle)) {
ipc_hangup(driver_phone);
printf(NAME ": Unable to register device\n");
return false;
}
return true;
}
 
int main(int argc, char **argv)
{
if (rd_init()) {
ipcarg_t phonead;
async_set_client_connection(rd_connection);
/* Register service at nameserver */
if (ipc_connect_to_me(PHONE_NS, SERVICE_RD, 0, 0, &phonead) != 0)
return -1;
async_manager();
/* Never reached */
return 0;
}
printf(NAME ": HelenOS RAM disk server\n");
return -1;
if (!rd_init())
return -1;
printf(NAME ": Accepting connections\n");
async_manager();
 
/* Never reached */
return 0;
}
 
/**