1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later
5 */
6
7#include <linux/linkage.h>
8#include <asm/thread_info.h>
9#include <asm/errno.h>
10#include <asm/blackfin.h>
11#include <asm/asm-offsets.h>
12
13#include <asm/context.S>
14
15#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
16.section .l1.text
17#else
18.text
19#endif
20
21ENTRY(_ret_from_fork)
22#ifdef CONFIG_IPIPE
23	/*
24	 * Hw IRQs are off on entry, and we don't want the scheduling tail
25	 * code to starve high priority domains from interrupts while it
26	 * runs. Therefore we first stall the root stage to have the
27	 * virtual interrupt state reflect IMASK.
28	 */
29	p0.l = ___ipipe_root_status;
30	p0.h = ___ipipe_root_status;
31	r4 = [p0];
32	bitset(r4, 0);
33	[p0] = r4;
34	/*
35	 * Then we may enable hw IRQs, allowing preemption from high
36	 * priority domains. schedule_tail() will do local_irq_enable()
37	 * since Blackfin does not define __ARCH_WANT_UNLOCKED_CTXSW, so
38	 * there is no need to unstall the root domain by ourselves
39	 * afterwards.
40	 */
41	p0.l = _bfin_irq_flags;
42	p0.h = _bfin_irq_flags;
43	r4 = [p0];
44	sti r4;
45#endif /* CONFIG_IPIPE */
46	SP += -12;
47	pseudo_long_call _schedule_tail, p5;
48	SP += 12;
49	p1 = [sp++];
50	r0 = [sp++];
51	cc = p1 == 0;
52	if cc jump .Lfork;
53	sp += -12;
54	call (p1);
55	sp += 12;
56.Lfork:
57	RESTORE_CONTEXT
58	rti;
59ENDPROC(_ret_from_fork)
60