diff options
Diffstat (limited to 'Core/CPU/x64/x64AsmLib/WaitForSemaphore.asm')
| -rw-r--r-- | Core/CPU/x64/x64AsmLib/WaitForSemaphore.asm | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/Core/CPU/x64/x64AsmLib/WaitForSemaphore.asm b/Core/CPU/x64/x64AsmLib/WaitForSemaphore.asm new file mode 100644 index 0000000..a5efa82 --- /dev/null +++ b/Core/CPU/x64/x64AsmLib/WaitForSemaphore.asm @@ -0,0 +1,88 @@ +;************************************************************************* +;************************************************************************* +;** ** +;** (C)Copyright 1985-2009, American Megatrends, Inc. ** +;** ** +;** All Rights Reserved. ** +;** ** +;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 ** +;** ** +;** Phone: (770)-246-8600 ** +;** ** +;************************************************************************* +;************************************************************************* + +;************************************************************************* +; $Header: /Alaska/SOURCE/Core/Modules/x64Core/x64AsmLib/WaitForSemaphore.asm 1 10/01/10 5:08p Felixp $ +; +; $Revision: 1 $ +; +; $Date: 10/01/10 5:08p $ +;************************************************************************* +; Revision History +; ---------------- +; $Log: /Alaska/SOURCE/Core/Modules/x64Core/x64AsmLib/WaitForSemaphore.asm $ +; +; 1 10/01/10 5:08p Felixp +; +; 1 8/24/06 12:57p Felixp +; +;************************************************************************* +;<AMI_FHDR_START> +; +; Name: +; +; Description: +; +;<AMI_FHDR_END> +;************************************************************************* +.code + +;************************************************************************* +;<AMI_PHDR_START> +; +; Name: WaitForSemaphore +; +; Description: +; VOID WaitForSemaphore(IN volatile UINT8 *Semaphore) waits for the +; semaphore to become available; once available, it claims the semaphore and +; returns. +; +; Input: +; IN volatile UINT8 *Semaphore +; Pointer to the desired semaphore. +; +; Output: +; VOID. +; +; Modified: +; +; Referrals: +; +; Notes: +; +;<AMI_PHDR_END> +;************************************************************************* +WaitForSemaphore Proc + mov al, 1 +@@: + xchg al, [rcx] + or al, al + pause + jnz @b + ret +WaitForSemaphore endp + +END +;************************************************************************* +;************************************************************************* +;** ** +;** (C)Copyright 1985-2009, American Megatrends, Inc. ** +;** ** +;** All Rights Reserved. ** +;** ** +;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 ** +;** ** +;** Phone: (770)-246-8600 ** +;** ** +;************************************************************************* |