devfs.c

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/*****************************************************************************************
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 $Id: devfs_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

*****************************************************************************************/

#include <devfs/devfs.h>
#include <vfs/vfs.h>
#include <sys/device.h>
#include <ubixos/types.h>
#include <ubixos/spinlock.h>
#include <ubixos/kpanic.h>
#include <lib/kmalloc.h>
#include <lib/string.h>
#include <lib/kprintf.h>

/* Spinlock for devfs we should start converting to sem/mutex */
static spinLock_t devfsSpinLock = SPIN_LOCK_INITIALIZER;

/* Length of dev list */
static int devfs_len = 0x0;

static void devfs_initialize(struct vfs_mountPoint *mp) {
  struct devfs_info *fsInfo = 0x0;

  /* Allocate memory for the fsInfo */
  if ((mp->fsInfo = (struct devfs_info *)kmalloc(sizeof(struct devfs_info))) == 0x0)
    K_PANIC("devfs: failed to allocate memor\n");

  fsInfo = mp->fsInfo;
  fsInfo->deviceList = 0x0;

  /* Return */
  return;
  }

static int devfs_open(char *file,fileDescriptor *fd) {
  struct devfs_info    *fsInfo  = fd->mp->fsInfo;
  struct devfs_devices *tmpDev = 0x0;
  struct device_node   *device = 0x0;

  spinLock(&devfsSpinLock);

  if (strcmp(file,"/") == 0x0) {
    fd->start = -1;
    fd->size  = devfs_len;
    spinUnlock(&devfsSpinLock);
    return(0x1);
    }
  if (file[0] == '/')
    file++;  
  for (tmpDev = fsInfo->deviceList;tmpDev != 0x0;tmpDev = tmpDev->next) {
    if (strcmp(tmpDev->devName,file) == 0x0) {
      switch ((fd->mode & 0x3)) {
        case 0:
        case 1:
          device = device_find(tmpDev->devMajor,tmpDev->devMinor);
          (void *)fd->start = tmpDev;
          fd->size  = device->devInfo->size;
          break;
        default:
          kprintf("Invalid File Mode\n");
          spinUnlock(&devfsSpinLock);
          return(-1);
          break;
          }
        spinUnlock(&devfsSpinLock);
        return(0x1);
      }
    }
  spinUnlock(&devfsSpinLock);
  return(0x0);
  }

static int devfs_read(fileDescriptor *fd,char *data,long offset,long size) {
  int i = 0x0,x = 0x0;
  uInt32 sectors = 0x0;
  uInt16 diff    = 0x0;
  struct device_node   *device = 0x0;
  struct devfs_devices *tmpDev = (void *)fd->start;

  if (tmpDev == -1) {
    kprintf("Hi Ubie [%i]!!!\n", size);
    for (i = 0;i < size;i++) {
      data[i] = 'a';
      fd->buffer[i] = 'a';
      }
    data[size - 1] = '\n';
    return(size);
    }

  device = device_find(tmpDev->devMajor,tmpDev->devMinor);

  sectors = ((size+511)/512);
  diff    = (offset - ((offset/512)*512));

  for (i=0x0;i<sectors;i++) {
    device->devInfo->read(device->devInfo->info,fd->buffer,i + (offset/512),1);
    for (x=0x0;x<(size - (i*512));x++) {
      if (diff > 0) {
        data[x] = fd->buffer[x + diff];
        }
      else {
        data[x] = fd->buffer[x];
        }
      }
    diff  = 0x0;
    data += 512;
    }

  return(size);
  }

/************************************************************************

Function: int writeDevFS(fileDescriptor *fd,char *data,long offset,long size)
Description: Write Data Into File
Notes:

************************************************************************/
static int devfs_write(fileDescriptor *fd,char *data,long offset,long size) {
  int i = 0x0,x = 0x0;
  struct device_node   *device = 0x0;
  struct devfs_devices *tmpDev = (void *)fd->start;

  device = device_find(tmpDev->devMajor,tmpDev->devMinor);
  for (i=0x0;i<((size+511)/512);i++) {
    device->devInfo->read(device->devInfo->info,fd->buffer,i + (offset/512),1);
    for (x=0x0;((x < 512) && ((x + (i * 512))  < size));x++) {
      fd->buffer[x] = data[x];
      }
    device->devInfo->write(device->devInfo->info,fd->buffer,i + (offset/512),1);
    data += 512;
    }
  return(size);
  }

  
int devfs_makeNode(char *name,uInt8 type,uInt16 major,uInt16 minor) {
  struct vfs_mountPoint  *mp     = 0x0;
  struct devfs_info    *fsInfo = 0x0;
  struct devfs_devices *tmpDev = 0x0;

  spinLock(&devfsSpinLock);
  
  mp = vfs_findMount("devfs");
  
  if (mp == 0x0) {
    kprintf("Error: Can't Find Mount Point\n");
    spinUnlock(&devfsSpinLock);
    return(-1);
    }
    
  fsInfo = mp->fsInfo;

  tmpDev = (struct devfs_devices *)kmalloc(sizeof(struct devfs_devices));

  tmpDev->devType  = type;
  tmpDev->devMajor = major;
  tmpDev->devMinor = minor;
  sprintf(tmpDev->devName,name);
  devfs_len += strlen(name) + 1;

  tmpDev->next = fsInfo->deviceList;
  tmpDev->prev = 0x0;
  if (fsInfo->deviceList != 0x0) {
    fsInfo->deviceList->prev = tmpDev;
    }
    
  fsInfo->deviceList       = tmpDev;
  
  spinUnlock(&devfsSpinLock);
  return(0x0);
  }  
  
int devfs_init() {
  /* Build our devfs struct */
  struct fileSystem devFS =
   {NULL,                         /* prev        */
    NULL,                         /* next        */
    (void *)devfs_initialize,     /* vfsInitFS   */
    (void *)devfs_read,           /* vfsRead     */
    (void *)devfs_write,          /* vfsWrite    */
    (void *)devfs_open,           /* vfsOpenFile */
    NULL,                         /* vfsUnlink   */
    NULL,                         /* vfsMakeDir  */
    NULL,                         /* vfsRemDir   */
    NULL,                         /* vfsSync     */
    1                             /* vfsType     */
   }; /* devFS */

    if (vfsRegisterFS(devFS) != 0x0) {
    //sysErr(systemErr,"Unable To Enable DevFS");
    return(0x1);
    }
  /* Mount our devfs this will build the devfs container node */
  vfs_mount(0x0,0x0,0x0,0x1,"devfs","rw"); // Mount Device File System
  
  /* Return */
  return(0x0);
  }

/***
 END
 ***/

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