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      1 /*++
      2 
      3 Copyright (c) 1998  Intel Corporation
      4 
      5 Module Name:
      6 
      7     lock.c
      8 
      9 Abstract:
     10 
     11     Implements FLOCK
     12 
     13 
     14 
     15 Revision History
     16 
     17 --*/
     18 
     19 
     20 #include "lib.h"
     21 
     22 
     23 
     24 #ifndef __GNUC__
     25 #pragma RUNTIME_CODE(RtAcquireLock)
     26 #endif
     27 VOID
     28 RtAcquireLock (
     29     IN FLOCK    *Lock
     30     )
     31 /*++
     32 
     33 Routine Description:
     34 
     35     Raising to the task priority level of the mutual exclusion
     36     lock, and then acquires ownership of the lock.
     37 
     38 Arguments:
     39 
     40     Lock        - The lock to acquire
     41 
     42 Returns:
     43 
     44     Lock owned
     45 
     46 --*/
     47 {
     48     if (BS) {
     49         if (BS->RaiseTPL != NULL) {
     50             Lock->OwnerTpl = uefi_call_wrapper(BS->RaiseTPL, 1, Lock->Tpl);
     51         }
     52     }
     53     else {
     54         if (LibRuntimeRaiseTPL != NULL) {
     55             Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
     56         }
     57     }
     58     Lock->Lock += 1;
     59     ASSERT (Lock->Lock == 1);
     60 }
     61 
     62 
     63 #ifndef __GNUC__
     64 #pragma RUNTIME_CODE(RtAcquireLock)
     65 #endif
     66 VOID
     67 RtReleaseLock (
     68     IN FLOCK    *Lock
     69     )
     70 /*++
     71 
     72 Routine Description:
     73 
     74     Releases ownership of the mutual exclusion lock, and
     75     restores the previous task priority level.
     76 
     77 Arguments:
     78 
     79     Lock        - The lock to release
     80 
     81 Returns:
     82 
     83     Lock unowned
     84 
     85 --*/
     86 {
     87     EFI_TPL     Tpl;
     88 
     89     Tpl = Lock->OwnerTpl;
     90     ASSERT(Lock->Lock == 1);
     91     Lock->Lock -= 1;
     92     if (BS) {
     93         if (BS->RestoreTPL != NULL) {
     94             uefi_call_wrapper(BS->RestoreTPL, 1, Tpl);
     95         }
     96     }
     97     else {
     98         if (LibRuntimeRestoreTPL != NULL) {
     99             LibRuntimeRestoreTPL(Tpl);
    100         }
    101     }
    102 }
    103