mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 05:46:42 +07:00
60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
/*
|
|
* Copyright 2004-2009 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/blackfin.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#include <asm/context.S>
|
|
|
|
#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
|
|
.section .l1.text
|
|
#else
|
|
.text
|
|
#endif
|
|
|
|
ENTRY(_ret_from_fork)
|
|
#ifdef CONFIG_IPIPE
|
|
/*
|
|
* Hw IRQs are off on entry, and we don't want the scheduling tail
|
|
* code to starve high priority domains from interrupts while it
|
|
* runs. Therefore we first stall the root stage to have the
|
|
* virtual interrupt state reflect IMASK.
|
|
*/
|
|
p0.l = ___ipipe_root_status;
|
|
p0.h = ___ipipe_root_status;
|
|
r4 = [p0];
|
|
bitset(r4, 0);
|
|
[p0] = r4;
|
|
/*
|
|
* Then we may enable hw IRQs, allowing preemption from high
|
|
* priority domains. schedule_tail() will do local_irq_enable()
|
|
* since Blackfin does not define __ARCH_WANT_UNLOCKED_CTXSW, so
|
|
* there is no need to unstall the root domain by ourselves
|
|
* afterwards.
|
|
*/
|
|
p0.l = _bfin_irq_flags;
|
|
p0.h = _bfin_irq_flags;
|
|
r4 = [p0];
|
|
sti r4;
|
|
#endif /* CONFIG_IPIPE */
|
|
SP += -12;
|
|
pseudo_long_call _schedule_tail, p5;
|
|
SP += 12;
|
|
p1 = [sp++];
|
|
r0 = [sp++];
|
|
cc = p1 == 0;
|
|
if cc jump .Lfork;
|
|
sp += -12;
|
|
call (p1);
|
|
sp += 12;
|
|
.Lfork:
|
|
RESTORE_CONTEXT
|
|
rti;
|
|
ENDPROC(_ret_from_fork)
|