Kernel/vfs/handle.c

   1 /*
   2  * Acess2 VFS
   3  * - AllocHandle, GetHandle
   4  */
   5 #define DEBUG   0
   6 #include <acess.h>
   7 #include <mm_virt.h>
   8 #include "vfs.h"
   9 #include "vfs_int.h"
  10 #include "vfs_ext.h"
  11
  12 // === CONSTANTS ===
  13 #define MAX_KERNEL_FILES        128
  14
  15 // === PROTOTYPES ===
  16 #if 0
  17 tVFS_Handle     *VFS_GetHandle(int FD);
  18 #endif
  19  int    VFS_AllocHandle(int FD, tVFS_Node *Node, int Mode);
  20
  21 // === GLOBALS ===
  22 tVFS_Handle     *gaUserHandles = (void*)MM_PPD_VFS;
  23 tVFS_Handle     *gaKernelHandles = (void*)MM_KERNEL_VFS;
  24
  25 // === CODE ===
  26 /**
  27  * \fn tVFS_Handle *VFS_GetHandle(int FD)
  28  * \brief Gets a pointer to the handle information structure
  29  */
  30 tVFS_Handle *VFS_GetHandle(int FD)
  31 {
  32         tVFS_Handle     *h;
  33
  34         //Log_Debug("VFS", "VFS_GetHandle: (FD=0x%x)", FD);
  35
  36         if(FD < 0)      return NULL;
  37
  38         if(FD & VFS_KERNEL_FLAG) {
  39                 FD &= (VFS_KERNEL_FLAG - 1);
  40                 if(FD >= MAX_KERNEL_FILES)      return NULL;
  41                 h = &gaKernelHandles[ FD ];
  42         } else {
  43                 if(FD >= CFGINT(CFG_VFS_MAXFILES))      return NULL;
  44                 h = &gaUserHandles[ FD ];
  45         }
  46
  47         if(h->Node == NULL)     return NULL;
  48         //Log_Debug("VFS", "VFS_GetHandle: RETURN %p", h);
  49         return h;
  50 }
  51
  52 int VFS_AllocHandle(int bIsUser, tVFS_Node *Node, int Mode)
  53 {
  54          int    i;
  55
  56         // Check for a user open
  57         if(bIsUser)
  58         {
  59                 // Allocate Buffer
  60                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
  61                 {
  62                         Uint    addr, size;
  63                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
  64                         for(addr = 0; addr < size; addr += 0x1000)
  65                         {
  66                                 if( !MM_Allocate( (Uint)gaUserHandles + addr ) )
  67                                 {
  68                                         Warning("OOM - VFS_AllocHandle");
  69                                         Threads_Exit(0, 0xFF);  // Terminate user
  70                                 }
  71                         }
  72                         memset( gaUserHandles, 0, size );
  73                 }
  74                 // Get a handle
  75                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
  76                 {
  77                         if(gaUserHandles[i].Node)       continue;
  78                         gaUserHandles[i].Node = Node;
  79                         gaUserHandles[i].Position = 0;
  80                         gaUserHandles[i].Mode = Mode;
  81                         return i;
  82                 }
  83         }
  84         else
  85         {
  86                 // Allocate space if not already
  87                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
  88                 {
  89                         Uint    addr, size;
  90                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
  91                         for(addr = 0; addr < size; addr += 0x1000)
  92                         {
  93                                 if( !MM_Allocate( (Uint)gaKernelHandles + addr ) )
  94                                 {
  95                                         Panic("OOM - VFS_AllocHandle");
  96                                         Threads_Exit(0, 0xFF);  // Terminate application (get some space back)
  97                                 }
  98                         }
  99                         memset( gaKernelHandles, 0, size );
 100                 }
 101                 // Get a handle
 102                 for(i=0;i<MAX_KERNEL_FILES;i++)
 103                 {
 104                         if(gaKernelHandles[i].Node)     continue;
 105                         gaKernelHandles[i].Node = Node;
 106                         gaKernelHandles[i].Position = 0;
 107                         gaKernelHandles[i].Mode = Mode;
 108                         return i|VFS_KERNEL_FLAG;
 109                 }
 110         }
 111
 112         return -1;
 113 }