kitten/user/liblwk/pmem.c

   1 /* Copyright (c) 2008, Sandia National Laboratories */
   2
   3 #include <lwk/liblwk.h>
   4
   5 const char *
   6 pmem_type_to_string(pmem_type_t type)
   7 {
   8         switch(type) {
   9                 case PMEM_TYPE_BOOTMEM:     return "BOOTMEM";     break;
  10                 case PMEM_TYPE_BIGPHYSAREA: return "BIGPHYSAREA"; break;
  11                 case PMEM_TYPE_INITRD:      return "INITRD";      break;
  12                 case PMEM_TYPE_INIT_TASK:   return "INIT_TASK";   break;
  13                 case PMEM_TYPE_KMEM:        return "KMEM";        break;
  14                 case PMEM_TYPE_UMEM:        return "UMEM";        break;
  15         }
  16         return "UNKNOWN";
  17 }
  18
  19 void
  20 pmem_region_unset_all(struct pmem_region *rgn)
  21 {
  22         rgn->type_is_set      = false;
  23         rgn->lgroup_is_set    = false;
  24         rgn->allocated_is_set = false;
  25         rgn->name_is_set      = false;
  26 }
  27
  28 int
  29 pmem_alloc_umem(size_t size, size_t alignment, struct pmem_region *rgn)
  30 {
  31         struct pmem_region constraint, result;
  32
  33         /* Find and allocate a chunk of PMEM_TYPE_UMEM physical memory */
  34         pmem_region_unset_all(&constraint);
  35         constraint.start     = 0;
  36         constraint.end       = (paddr_t)(-1);
  37         constraint.type      = PMEM_TYPE_UMEM; constraint.type_is_set = true;
  38         constraint.allocated = false;          constraint.allocated_is_set = true;
  39
  40         if (pmem_alloc(size, alignment, &constraint, &result))
  41                 return -ENOMEM;
  42
  43         *rgn = result;
  44         return 0;
  45 }
  46
  47 bool
  48 pmem_is_umem(paddr_t start, size_t extent)
  49 {
  50         struct pmem_region query, result;
  51         int status;
  52
  53         pmem_region_unset_all(&query);
  54         query.start = start;
  55         query.end   = start + extent;
  56         query.type  = PMEM_TYPE_UMEM; query.type_is_set = true;
  57         result.end  = 0;
  58
  59         while ((status = pmem_query(&query, &result)) == 0) {
  60                 if (result.start != query.start)
  61                         return false;
  62                 if (result.end == query.end)
  63                         break;
  64                 query.start = result.end;
  65         }
  66         return (status) ? false : true;
  67 }