diff options
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 11 | ||||
| -rw-r--r-- | arch/blackfin/mach-common/interrupt.S | 6 |
2 files changed, 14 insertions, 3 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index bc08c98d008..4845d51e88a 100644 --- a/arch/blackfin/mach-common/entry.S +++ b/arch/blackfin/mach-common/entry.S @@ -952,8 +952,17 @@ ENDPROC(_evt_up_evt14) #ifdef CONFIG_IPIPE _resume_kernel_from_int: + r1 = LO(~0x8000) (Z); + r1 = r0 & r1; + r0 = 1; + r0 = r1 - r0; + r2 = r1 & r0; + cc = r2 == 0; + /* Sync the root stage only from the outer interrupt level. */ + if !cc jump .Lnosync; r0.l = ___ipipe_sync_root; r0.h = ___ipipe_sync_root; + [--sp] = reti; [--sp] = rets; [--sp] = ( r7:4, p5:3 ); SP += -12; @@ -961,6 +970,8 @@ _resume_kernel_from_int: SP += 12; ( r7:4, p5:3 ) = [sp++]; rets = [sp++]; + reti = [sp++]; +.Lnosync: rts #elif defined(CONFIG_PREEMPT) diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S index 2df37db3b49..469ce7282dc 100644 --- a/arch/blackfin/mach-common/interrupt.S +++ b/arch/blackfin/mach-common/interrupt.S @@ -274,16 +274,16 @@ ENDPROC(_evt_system_call) * level to EVT14 to prepare the caller for a normal interrupt * return through RTI. * - * We currently use this facility in two occasions: + * We currently use this feature in two occasions: * - * - to branch to __ipipe_irq_tail_hook as requested by a high + * - before branching to __ipipe_irq_tail_hook as requested by a high * priority domain after the pipeline delivered an interrupt, * e.g. such as Xenomai, in order to start its rescheduling * procedure, since we may not switch tasks when IRQ levels are * nested on the Blackfin, so we have to fake an interrupt return * so that we may reschedule immediately. * - * - to branch to sync_root_irqs, in order to play any interrupt + * - before branching to __ipipe_sync_root(), in order to play any interrupt * pending for the root domain (i.e. the Linux kernel). This lowers * the core priority level enough so that Linux IRQ handlers may * never delay interrupts handled by high priority domains; we defer |