qemu/roms/seabios/src/fw/acpi-dsdt-hpet.dsl

   1 /****************************************************************
   2  * HPET
   3  ****************************************************************/
   4
   5 Scope(\_SB) {
   6     Device(HPET) {
   7         Name(_HID, EISAID("PNP0103"))
   8         Name(_UID, 0)
   9         OperationRegion(HPTM, SystemMemory, 0xFED00000, 0x400)
  10         Field(HPTM, DWordAcc, Lock, Preserve) {
  11             VEND, 32,
  12             PRD, 32,
  13         }
  14         Method(_STA, 0, NotSerialized) {
  15             Store(VEND, Local0)
  16             Store(PRD, Local1)
  17             ShiftRight(Local0, 16, Local0)
  18             If (LOr(LEqual(Local0, 0), LEqual(Local0, 0xffff))) {
  19                 Return (0x0)
  20             }
  21             If (LOr(LEqual(Local1, 0), LGreater(Local1, 100000000))) {
  22                 Return (0x0)
  23             }
  24             Return (0x0F)
  25         }
  26         Name(_CRS, ResourceTemplate() {
  27 #if 0       /* This makes WinXP BSOD for not yet figured reasons. */
  28             IRQNoFlags() {2, 8}
  29 #endif
  30             Memory32Fixed(ReadOnly,
  31                 0xFED00000,         // Address Base
  32                 0x00000400,         // Address Length
  33                 )
  34         })
  35     }
  36 }