/share/man/man9/pmap_map.9

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  2. .\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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  28. .Dd July 21, 2003
  29. .Dt PMAP_MAP 9
  30. .Os
  31. .Sh NAME
  32. .Nm pmap_map
  33. .Nd map a physical memory range into kernel virtual address (KVA) space
  34. .Sh SYNOPSIS
  35. .In sys/param.h
  36. .In vm/vm.h
  37. .In vm/pmap.h
  38. .Ft vm_offset_t
  39. .Fo pmap_map
  40. .Fa "vm_offset_t *virt" "vm_paddr_t start" "vm_paddr_t end" "int prot"
  41. .Fc
  42. .Sh DESCRIPTION
  43. The
  44. .Fn pmap_map
  45. function maps a range of physical addresses into kernel virtual address (KVA)
  46. space, from
  47. .Fa start
  48. to
  49. .Fa end ,
  50. with protection bits
  51. .Fa prot .
  52. .Pp
  53. The value passed in
  54. .Fa *virt
  55. is treated as a hint for the virtual address of the beginning of the mapping.
  56. .Sh IMPLEMENTATION NOTES
  57. The
  58. .Fa prot
  59. argument is currently ignored by machine-dependent implementations.
  60. .Pp
  61. Architectures which can support a direct mapped physical to virtual
  62. region can return the appropriate address within that region, leaving
  63. .Fa *virt
  64. unchanged.
  65. .Sh RETURN VALUES
  66. The
  67. .Fn pmap_map
  68. function returns the virtual address of the beginning of the mapping, if
  69. the mapping was successfully made;
  70. .Fa *virt
  71. will also be updated with the first usable address after the mapped region.
  72. .Pp
  73. If the function is unsuccessful,
  74. .Dv NULL
  75. is returned.
  76. .Sh SEE ALSO
  77. .Xr pmap 9
  78. .Sh AUTHORS
  79. This manual page was written by
  80. .An Bruce M Simpson Aq bms@spc.org .