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 #if defined(__NetBSD__) || defined(__FreeBSD__)
  16 #define HAVE_IPC
  17 #include <sys/types.h>
  18 #include <sys/ipc.h>
  19 #include <sys/shm.h>
  20 #define SHMSEG 32     /* XXX SEMMNI /usr/src/sys/conf/param.h */
  21 #define SHM_RANGE_START       0x40000000
  22 #endif
  23
  24 /*
  25  * Array to track selector allocation.
  26  */
  27 #define MAX_SELECTORS           512
  28 #define SELECTOR_ISFREE         0x8000
  29 #define SELECTOR_INDEXMASK      0x0fff
  30
  31 extern unsigned short SelectorMap[MAX_SELECTORS];
  32
  33 #ifdef HAVE_IPC
  34 #define SAFEMAKEPTR(s, o) (((int) (s) << 16) | ((o) & 0xffff))
  35 #define FIXPTR(p)         (p)
  36 #else
  37 #define SAFEMAKEPTR(s, o) \
  38     (((int) SelectorMap[SelectorMap[(s) >> 3] & SELECTOR_INDEXMASK] << 19) \
  39      | 0x70000 | ((o) & 0xffff))
  40 #define FIXPTR(p)         SAFEMAKEPTR((unsigned long) (p) >> 16, (p))
  41 #endif
  42
  43 /*
  44  * Structure to hold info about each selector we create.
  45  */
  46
  47 typedef struct segment_descriptor_s
  48 {
  49     void          *base_addr;   /* Pointer to segment in flat memory    */
  50     unsigned int   length;      /* Length of segment                    */
  51     unsigned int   flags;       /* Segment flags (see neexe.h and below)*/
  52     unsigned short selector;    /* Selector used to access this segment */
  53     unsigned short owner;       /* Handle of owner program              */
  54     unsigned char  type;        /* DATA or CODE                         */
  55 #ifdef HAVE_IPC
  56     key_t          shm_key;     /* Shared memory key or IPC_PRIVATE     */
  57 #endif
  58 } SEGDESC;
  59
  60 extern int IPCCopySelector(int i_old, unsigned long new, int swap_type);
  61
  62 /*
  63  * Additional flags
  64  */
  65 #define NE_SEGFLAGS_MALLOCED    0x00010000 /* Memory allocated with malloc() */
  66
  67 /*
  68  * Global memory flags
  69  */
  70 #define GLOBAL_FLAGS_MOVEABLE           0x0002
  71 #define GLOBAL_FLAGS_ZEROINIT           0x0040
  72 #define GLOBAL_FLAGS_CODE               0x00010000
  73 #define GLOBAL_FLAGS_EXECUTEONLY        0x00020000
  74 #define GLOBAL_FLAGS_READONLY           0x00020000
  75
  76 #define FIRST_SELECTOR  8
  77
  78 static __inline__ int Is16bitAddress(void *address)
  79 {
  80     return ((int) address >= (((FIRST_SELECTOR << 3) | 0x0007) << 16));
  81 }
  82
  83 extern SEGDESC Segments[];
  84
  85 #endif /* SEGMEM_H */
  86
  87
  88
  89