projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1394f032 | 1 | /* |
| 96f1050d | 2 | * Copyright 2004-2009 Analog Devices Inc. |
| 1394f032 | 3 | * |
| 96f1050d | 4 | * Licensed under the GPL-2 or later |
| 1394f032 BW |
5 | */ |
| 6 | ||
| 7 | #include <linux/linkage.h> | |
| 8 | #include <asm/thread_info.h> | |
| 9 | #include <asm/errno.h> | |
| 8f65873e | 10 | #include <asm/blackfin.h> |
| 1394f032 BW |
11 | #include <asm/asm-offsets.h> |
| 12 | ||
| 639f6571 | 13 | #include <asm/context.S> |
| 1394f032 BW |
14 | |
| 15 | #ifdef CONFIG_EXCPT_IRQ_SYSC_L1 | |
| 16 | .section .l1.text | |
| 17 | #else | |
| 18 | .text | |
| 19 | #endif | |
| 20 | ||
| 21 | ENTRY(_ret_from_fork) | |
| 6a01f230 | 22 | #ifdef CONFIG_IPIPE |
| 6b8019c8 PG |
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; | |
| 6a01f230 | 45 | #endif /* CONFIG_IPIPE */ |
| 1394f032 | 46 | SP += -12; |
| d86bfb16 | 47 | pseudo_long_call _schedule_tail, p5; |
| 1394f032 | 48 | SP += 12; |
| ee1e17c6 AV |
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: | |
| 1394f032 BW |
57 | RESTORE_CONTEXT |
| 58 | rti; | |
| 51be24c3 | 59 | ENDPROC(_ret_from_fork) |