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Commit 94752a79 authored by Isaku Yamahata's avatar Isaku Yamahata Committed by Tony Luck
Browse files

ia64/pv_ops: paravirtualize mov = ar.itc. 



paravirtualize mov reg = ar.itc.

Signed-off-by: default avatarIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 9d1964f2

arch/ia64/include/asm/native/inst.h

+5 −0
Original line number Diff line number Diff line
@@ -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)

arch/ia64/kernel/entry.S

+2 −2
Original line number Diff line number Diff line
@@ -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

arch/ia64/kernel/fsys.S

+2 −2
Original line number Diff line number Diff line
@@ -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

arch/ia64/kernel/ivt.S

+1 −1
Original line number Diff line number Diff line
@@ -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