/* * 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 [31mCONFIG_EXCPT_IRQ_SYSC_L1[0m .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) |