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ia64/pv_ops: paravirtualize mov = ar.itc. 

paravirtualize mov reg = ar.itc.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2009-03-04 21:05:38 +09:00 committed by Tony Luck
parent 9d1964f25c
commit 94752a794d
4 changed files with 10 additions and 5 deletions
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5
arch/ia64/include/asm/native/inst.h
View File

@ -77,6 +77,11 @@
(pred) mov reg = psr \
CLOBBER(clob)
#define MOV_FROM_ITC(pred, pred_clob, reg, clob) \
(pred) mov reg = ar.itc \
CLOBBER(clob) \
CLOBBER_PRED(pred_clob)
#define MOV_TO_IFA(reg, clob) \
mov cr.ifa = reg \
CLOBBER(clob)

4
arch/ia64/kernel/entry.S
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@ -735,7 +735,7 @@ GLOBAL_ENTRY(__paravirt_leave_syscall)
__paravirt_work_processed_syscall:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
adds r2=PT(LOADRS)+16,r12
(pUStk) mov.m r22=ar.itc // fetch time at leave
MOV_FROM_ITC(pUStk, p9, r22, r19) // fetch time at leave
adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
;;
(p6) ld4 r31=[r18] // load current_thread_info()->flags
@ -984,7 +984,7 @@ GLOBAL_ENTRY(__paravirt_leave_kernel)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
.pred.rel.mutex pUStk,pKStk
MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled
(pUStk) mov.m r22=ar.itc // M fetch time at leave
MOV_FROM_ITC(pUStk, p9, r22, r29) // M fetch time at leave
nop.i 0
;;
#else

4
arch/ia64/kernel/fsys.S
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@ -280,7 +280,7 @@ ENTRY(fsys_gettimeofday)
(p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control
;;
.pred.rel.mutex p8,p9
(p8) mov r2 = ar.itc // CPU_TIMER. 36 clocks latency!!!
MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!!
(p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues..
(p13) ld8 r25 = [r19] // get itc_lastcycle value
ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec
@ -684,7 +684,7 @@ GLOBAL_ENTRY(paravirt_fsys_bubble_down)
;;
mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
mov.m r30=ar.itc // M get cycle for accounting
MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting
#else
nop.m 0
#endif

2
arch/ia64/kernel/ivt.S
View File

@ -804,7 +804,7 @@ ENTRY(break_fault)
///////////////////////////////////////////////////////////////////////
st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
mov.m r30=ar.itc // M get cycle for accounting
MOV_FROM_ITC(p0, p14, r30, r18) // M get cycle for accounting
#else
mov b6=r30 // I0 setup syscall handler branch reg early
#endif