mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-02 02:34:05 +08:00
4625cd6379
Rather than having two functionally identical implementations for 32- and 64-bit configurations, extend the existing assembly abstractions enough to fold the two rwlock implementations into a shared one. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4E258DD7020000780004E3EA@nat28.tlf.novell.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
/*
|
|
* i386 semaphore implementation.
|
|
*
|
|
* (C) Copyright 1999 Linus Torvalds
|
|
*
|
|
* Portions Copyright 1999 Red Hat, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/frame.h>
|
|
#include <asm/dwarf2.h>
|
|
|
|
/*
|
|
* The semaphore operations have a special calling sequence that
|
|
* allow us to do a simpler in-line version of them. These routines
|
|
* need to convert that sequence back into the C sequence when
|
|
* there is contention on the semaphore.
|
|
*
|
|
* %eax contains the semaphore pointer on entry. Save the C-clobbered
|
|
* registers (%eax, %edx and %ecx) except %eax whish is either a return
|
|
* value or just clobbered..
|
|
*/
|
|
.section .sched.text, "ax"
|
|
|
|
/* Fix up special calling conventions */
|
|
ENTRY(call_rwsem_down_read_failed)
|
|
CFI_STARTPROC
|
|
pushl_cfi %ecx
|
|
CFI_REL_OFFSET ecx,0
|
|
pushl_cfi %edx
|
|
CFI_REL_OFFSET edx,0
|
|
call rwsem_down_read_failed
|
|
popl_cfi %edx
|
|
popl_cfi %ecx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_down_read_failed)
|
|
|
|
ENTRY(call_rwsem_down_write_failed)
|
|
CFI_STARTPROC
|
|
pushl_cfi %ecx
|
|
CFI_REL_OFFSET ecx,0
|
|
calll rwsem_down_write_failed
|
|
popl_cfi %ecx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_down_write_failed)
|
|
|
|
ENTRY(call_rwsem_wake)
|
|
CFI_STARTPROC
|
|
decw %dx /* do nothing if still outstanding active readers */
|
|
jnz 1f
|
|
pushl_cfi %ecx
|
|
CFI_REL_OFFSET ecx,0
|
|
call rwsem_wake
|
|
popl_cfi %ecx
|
|
1: ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_wake)
|
|
|
|
/* Fix up special calling conventions */
|
|
ENTRY(call_rwsem_downgrade_wake)
|
|
CFI_STARTPROC
|
|
pushl_cfi %ecx
|
|
CFI_REL_OFFSET ecx,0
|
|
pushl_cfi %edx
|
|
CFI_REL_OFFSET edx,0
|
|
call rwsem_downgrade_wake
|
|
popl_cfi %edx
|
|
popl_cfi %ecx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_downgrade_wake)
|