arch/um/kernel/skas/mem_user.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <errno.h>
   7 #include <sys/mman.h>
   8 #include "mem_user.h"
   9 #include "mem.h"
  10 #include "user.h"
  11 #include "os.h"
  12 #include "proc_mm.h"
  13
  14 void map(int fd, unsigned long virt, unsigned long len, int r, int w,
  15          int x, int phys_fd, unsigned long long offset)
  16 {
  17         struct proc_mm_op map;
  18         int prot, n;
  19
  20         prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
  21                 (x ? PROT_EXEC : 0);
  22
  23         map = ((struct proc_mm_op) { .op        = MM_MMAP,
  24                                      .u         =
  25                                      { .mmap    =
  26                                        { .addr          = virt,
  27                                          .len           = len,
  28                                          .prot          = prot,
  29                                          .flags         = MAP_SHARED |
  30                                                           MAP_FIXED,
  31                                          .fd            = phys_fd,
  32                                          .offset        = offset
  33                                        } } } );
  34         n = os_write_file(fd, &map, sizeof(map));
  35         if(n != sizeof(map))
  36                 printk("map : /proc/mm map failed, err = %d\n", -n);
  37 }
  38
  39 int unmap(int fd, void *addr, unsigned long len)
  40 {
  41         struct proc_mm_op unmap;
  42         int n;
  43
  44         unmap = ((struct proc_mm_op) { .op      = MM_MUNMAP,
  45                                        .u       =
  46                                        { .munmap        =
  47                                          { .addr        = (unsigned long) addr,
  48                                            .len         = len } } } );
  49         n = os_write_file(fd, &unmap, sizeof(unmap));
  50         if(n != sizeof(unmap)) {
  51                 if(n < 0)
  52                         return(n);
  53                 else if(n > 0)
  54                         return(-EIO);
  55         }
  56
  57         return(0);
  58 }
  59
  60 int protect(int fd, unsigned long addr, unsigned long len, int r, int w,
  61             int x, int must_succeed)
  62 {
  63         struct proc_mm_op protect;
  64         int prot, n;
  65
  66         prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
  67                 (x ? PROT_EXEC : 0);
  68
  69         protect = ((struct proc_mm_op) { .op    = MM_MPROTECT,
  70                                        .u       =
  71                                        { .mprotect      =
  72                                          { .addr        = (unsigned long) addr,
  73                                            .len         = len,
  74                                            .prot        = prot } } } );
  75
  76         n = os_write_file(fd, &protect, sizeof(protect));
  77         if(n != sizeof(protect)) {
  78                 if(n == 0) return(0);
  79
  80                 if(must_succeed)
  81                         panic("protect failed, err = %d", -n);
  82
  83                 return(-EIO);
  84         }
  85
  86         return(0);
  87 }
  88
  89 void before_mem_skas(unsigned long unused)
  90 {
  91 }
  92
  93 /*
  94  * Overrides for Emacs so that we follow Linus's tabbing style.
  95  * Emacs will notice this stuff at the end of the file and automatically
  96  * adjust the settings for this buffer only.  This must remain at the end
  97  * of the file.
  98  * ---------------------------------------------------------------------------
  99  * Local variables:
 100  * c-file-style: "linux"
 101  * End:
 102  */