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Blackfin: initial preempt support while returning from interrupt 

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2010-08-12 07:56:40 +00:00 committed by Mike Frysinger
parent c0ab938745
commit 33ded95b1c
2 changed files with 126 additions and 3 deletions
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112
arch/blackfin/mach-common/entry.S
View File

@ -889,6 +889,66 @@ ENTRY(_ret_from_exception)
rts;
ENDPROC(_ret_from_exception)
#if defined(CONFIG_PREEMPT)
ENTRY(_up_to_irq14)
#if ANOMALY_05000281 || ANOMALY_05000461
r0.l = lo(SAFE_USER_INSTRUCTION);
r0.h = hi(SAFE_USER_INSTRUCTION);
reti = r0;
#endif
#ifdef CONFIG_DEBUG_HWERR
/* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#else
/* Only enable irq14 interrupt, until we transition to _evt_evt14 */
r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#endif
sti r0;
p0.l = lo(EVT14);
p0.h = hi(EVT14);
p1.l = _evt_up_evt14;
p1.h = _evt_up_evt14;
[p0] = p1;
csync;
raise 14;
1:
jump 1b;
ENDPROC(_up_to_irq14)
ENTRY(_evt_up_evt14)
#ifdef CONFIG_DEBUG_HWERR
r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
sti r0;
#else
cli r0;
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
[--sp] = rets;
sp += -12;
call _trace_hardirqs_off;
sp += 12;
rets = [sp++];
#endif
[--sp] = RETI;
SP += 4;
/* restore normal evt14 */
p0.l = lo(EVT14);
p0.h = hi(EVT14);
p1.l = _evt_evt14;
p1.h = _evt_evt14;
[p0] = p1;
csync;
rts;
ENDPROC(_evt_up_evt14)
#endif
#ifdef CONFIG_IPIPE
_resume_kernel_from_int:
@ -902,8 +962,54 @@ _resume_kernel_from_int:
( r7:4, p5:3 ) = [sp++];
rets = [sp++];
rts
#elif defined(CONFIG_PREEMPT)
_resume_kernel_from_int:
/* check preempt_count */
r7 = sp;
r4.l = lo(ALIGN_PAGE_MASK);
r4.h = hi(ALIGN_PAGE_MASK);
r7 = r7 & r4;
p5 = r7;
r7 = [p5 + TI_PREEMPT];
cc = r7 == 0x0;
if !cc jump .Lreturn_to_kernel;
.Lneed_schedule:
r7 = [p5 + TI_FLAGS];
r4.l = lo(_TIF_WORK_MASK);
r4.h = hi(_TIF_WORK_MASK);
r7 = r7 & r4;
cc = BITTST(r7, TIF_NEED_RESCHED);
if !cc jump .Lreturn_to_kernel;
/*
* let schedule done at level 15, otherwise sheduled process will run
* at high level and block low level interrupt
*/
r6 = reti; /* save reti */
r5.l = .Lkernel_schedule;
r5.h = .Lkernel_schedule;
reti = r5;
rti;
.Lkernel_schedule:
[--sp] = rets;
sp += -12;
pseudo_long_call _preempt_schedule_irq, p4;
sp += 12;
rets = [sp++];
[--sp] = rets;
sp += -12;
/* up to irq14 so that reti after restore_all can return to irq15(kernel) */
pseudo_long_call _up_to_irq14, p4;
sp += 12;
rets = [sp++];
reti = r6; /* restore reti so that origin process can return to interrupted point */
jump .Lneed_schedule;
#else
#define _resume_kernel_from_int 2f
#define _resume_kernel_from_int .Lreturn_to_kernel
#endif
ENTRY(_return_from_int)
@ -913,7 +1019,7 @@ ENTRY(_return_from_int)
p2.h = hi(ILAT);
r0 = [p2];
cc = bittst (r0, EVT_IVG15_P);
if cc jump 2f;
if cc jump .Lreturn_to_kernel;
/* if not return to user mode, get out */
p2.l = lo(IPEND);
@ -945,7 +1051,7 @@ ENTRY(_return_from_int)
STI r0;
raise 15; /* raise evt15 to do signal or reschedule */
rti;
2:
.Lreturn_to_kernel:
rts;
ENDPROC(_return_from_int)

17
arch/blackfin/mach-common/interrupt.S
View File

@ -116,7 +116,24 @@ __common_int_entry:
cc = r0 == 0;
if cc jump .Lcommon_restore_context;
#else /* CONFIG_IPIPE */
#ifdef CONFIG_PREEMPT
r7 = sp;
r4.l = lo(ALIGN_PAGE_MASK);
r4.h = hi(ALIGN_PAGE_MASK);
r7 = r7 & r4;
p5 = r7;
r7 = [p5 + TI_PREEMPT]; /* get preempt count */
r7 += 1; /* increment it */
[p5 + TI_PREEMPT] = r7;
#endif
pseudo_long_call _do_irq, p2;
#ifdef CONFIG_PREEMPT
r7 += -1;
[p5 + TI_PREEMPT] = r7; /* restore preempt count */
#endif
SP += 12;
#endif /* CONFIG_IPIPE */
pseudo_long_call _return_from_int, p2;