| /* | |
| * 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) |