lib/libsys/vm_cache.c

   1
   2 #include "syslib.h"
   3
   4 #include <string.h>
   5 #include <assert.h>
   6
   7 #include <sys/mman.h>
   8 #include <minix/vm.h>
   9 #include <minix/sysutil.h>
  10 #include <machine/vmparam.h>
  11
  12 int vm_cachecall(message *m, int call, void *addr, u32_t dev, u64_t dev_offset,
  13         u64_t ino, u64_t ino_offset, u32_t *flags, int blocksize)
  14 {
  15     if(blocksize % PAGE_SIZE)
  16         panic("blocksize %d should be a multiple of pagesize %d\n",
  17                 blocksize, PAGE_SIZE);
  18
  19     if(ino_offset % PAGE_SIZE)
  20         panic("inode offset %lld should be a multiple of pagesize %d\n",
  21                 ino_offset, PAGE_SIZE);
  22
  23     if(dev_offset % PAGE_SIZE)
  24         panic("dev offset offset %lld should be a multiple of pagesize %d\n",
  25                 dev_offset, PAGE_SIZE);
  26
  27     memset(m, 0, sizeof(*m));
  28
  29     assert(dev != NO_DEV);
  30
  31     m->m_u.m_vmmcp.dev_offset_pages = dev_offset/PAGE_SIZE;
  32     m->m_u.m_vmmcp.ino_offset_pages = ino_offset/PAGE_SIZE;
  33     m->m_u.m_vmmcp.ino = ino;
  34     m->m_u.m_vmmcp.block = addr;
  35     m->m_u.m_vmmcp.flags_ptr = flags;
  36     m->m_u.m_vmmcp.dev = dev;
  37     m->m_u.m_vmmcp.pages = blocksize / PAGE_SIZE;
  38     m->m_u.m_vmmcp.flags = 0;
  39
  40     return _taskcall(VM_PROC_NR, call, m);
  41 }
  42
  43 void *vm_map_cacheblock(u32_t dev, u64_t dev_offset,
  44         u64_t ino, u64_t ino_offset, u32_t *flags, int blocksize)
  45 {
  46         message m;
  47
  48         if(vm_cachecall(&m, VM_MAPCACHEPAGE, NULL, dev, dev_offset,
  49                 ino, ino_offset, flags, blocksize) != OK)
  50                 return MAP_FAILED;
  51
  52         return m.m_u.m_vmmcp_reply.addr;
  53 }
  54
  55 int vm_set_cacheblock(void *block, u32_t dev, u64_t dev_offset,
  56         u64_t ino, u64_t ino_offset, u32_t *flags, int blocksize)
  57 {
  58         message m;
  59
  60         return vm_cachecall(&m, VM_SETCACHEPAGE, block, dev, dev_offset,
  61                 ino, ino_offset, flags, blocksize);
  62 }