include/segmem.h

   1 /* $Id: segmem.h,v 1.3 1993/07/04 04:04:21 root Exp root $
   2  */
   3 /*
   4  * Copyright  Robert J. Amstadt, 1993
   5  */
   6 #ifndef SEGMEM_H
   7 #define SEGMEM_H
   8
   9 #ifdef __linux__
  10 #define HAVE_IPC
  11 #include <sys/ipc.h>
  12 #include <sys/shm.h>
  13 #endif
  14
  15 /*
  16  * Array to track selector allocation.
  17  */
  18 #define MAX_SELECTORS           512
  19 #define SELECTOR_ISFREE         0x8000
  20 #define SELECTOR_INDEXMASK      0x0fff
  21
  22 extern unsigned short SelectorMap[MAX_SELECTORS];
  23
  24 #ifdef HAVE_IPC
  25 #define SAFEMAKEPTR(s, o) (((int) (s) << 16) | ((o) & 0xffff))
  26 #define FIXPTR(p)         (p)
  27 #else
  28 #define SAFEMAKEPTR(s, o) \
  29     (((int) SelectorMap[SelectorMap[(s) >> 3] & SELECTOR_INDEXMASK] << 19) \
  30      | 0x70000 | ((o) & 0xffff))
  31 #define FIXPTR(p)         SAFEMAKEPTR((unsigned long) (p) >> 16, (p))
  32 #endif
  33
  34 /*
  35  * Structure to hold info about each selector we create.
  36  */
  37
  38 typedef struct segment_descriptor_s
  39 {
  40     void          *base_addr;   /* Pointer to segment in flat memory    */
  41     unsigned int   length;      /* Length of segment                    */
  42     unsigned int   flags;       /* Segment flags (see neexe.h and below)*/
  43     unsigned short selector;    /* Selector used to access this segment */
  44     unsigned short owner;       /* Handle of owner program              */
  45     unsigned char  type;        /* DATA or CODE                         */
  46 #ifdef HAVE_IPC
  47     key_t          shm_key;     /* Shared memory key or IPC_PRIVATE     */
  48 #endif
  49 } SEGDESC;
  50
  51 extern int IPCCopySelector(int i_old, unsigned long new, int swap_type);
  52
  53 /*
  54  * Additional flags
  55  */
  56 #define NE_SEGFLAGS_MALLOCED    0x00010000 /* Memory allocated with malloc() */
  57
  58 /*
  59  * Global memory flags
  60  */
  61 #define GLOBAL_FLAGS_MOVEABLE           0x0002
  62 #define GLOBAL_FLAGS_ZEROINIT           0x0040
  63 #define GLOBAL_FLAGS_CODE               0x00010000
  64 #define GLOBAL_FLAGS_EXECUTEONLY        0x00020000
  65 #define GLOBAL_FLAGS_READONLY           0x00020000
  66
  67 #define FIRST_SELECTOR  8
  68
  69 static __inline__ int Is16bitAddress(void *address)
  70 {
  71     return ((int) address >= (((FIRST_SELECTOR << 3) | 0x0007) << 16));
  72 }
  73
  74 extern SEGDESC Segments[];
  75
  76 #endif /* SEGMEM_H */
  77
  78
  79
  80