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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-ia64-devel] [PATCH 4/8] ia64/pv_ops: paravirtualize arch/ia64/kernel/switch_leave.S
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/kernel/switch_leave.S | 86 ++++++++++++++++++++++----------------
1 files changed, 50 insertions(+), 36 deletions(-)
diff --git a/arch/ia64/kernel/switch_leave.S b/arch/ia64/kernel/switch_leave.S
index b235917..c016556 100644
--- a/arch/ia64/kernel/switch_leave.S
+++ b/arch/ia64/kernel/switch_leave.S
@@ -44,8 +44,14 @@
#include <asm/pgtable.h>
#include <asm/thread_info.h>
-#include "minstate.h"
+#ifdef __IA64_ASM_PARAVIRTUALIZED_XEN
+#include "../xen/inst_xen.h"
+#include "../xen/xenminstate.h"
+#else
+#include "inst_native.h"
+#endif
+#include "minstate.h"
/*
* prev_task <- ia64_switch_to(struct task_struct *next)
@@ -53,7 +59,8 @@
* called. The code starting at .map relies on this. The rest of the code
* doesn't care about the interrupt masking status.
*/
-GLOBAL_ENTRY(__ia64_switch_to)
+GLOBAL_ENTRY(__paravirt_switch_to)
+ BR_IF_NATIVE(__ia64_switch_to, r22, p7)
.prologue
alloc r16=ar.pfs,1,0,0,0
DO_SAVE_SWITCH_STACK
@@ -77,7 +84,7 @@ GLOBAL_ENTRY(__ia64_switch_to)
;;
.done:
ld8 sp=[r21] // load kernel stack pointer of new task
- mov IA64_KR(CURRENT)=in0 // update "current" application register
+ MOV_TO_KR(CURRENT, in0) // update "current" application register
mov r8=r13 // return pointer to previously running
task
mov r13=in0 // set "current" pointer
;;
@@ -89,25 +96,30 @@ GLOBAL_ENTRY(__ia64_switch_to)
br.ret.sptk.many rp // boogie on out in new context
.map:
- rsm psr.ic // interrupts (psr.i) are already
disabled here
+ RSM_PSR_IC(r25) // interrupts (psr.i) are already
disabled here
movl r25=PAGE_KERNEL
;;
srlz.d
or r23=r25,r20 // construct PA | page properties
mov r25=IA64_GRANULE_SHIFT<<2
;;
- mov cr.itir=r25
- mov cr.ifa=in0 // VA of next task...
+ MOV_TO_ITIR(p0, r25, r8)
+ MOV_TO_IFA(in0, r8) // VA of next task...
;;
mov r25=IA64_TR_CURRENT_STACK
- mov IA64_KR(CURRENT_STACK)=r26 // remember last page we mapped...
+ MOV_TO_KR(CURRENT_STACK, r26) // remember last page we mapped...
;;
itr.d dtr[r25]=r23 // wire in new mapping...
- ssm psr.ic // reenable the psr.ic bit
- ;;
- srlz.d
+ SSM_PSR_IC_AND_SRLZ_D(r8, r9) // reenable the psr.ic bit
br.cond.sptk .done
-END(__ia64_switch_to)
+END(__paravirt_switch_to)
+
+#ifdef IA64_ASM_PARAVIRTUALIZED_XEN
+GLOBAL_ENTRY(xen_work_processed_syscall_with_check)
+ BR_IF_NATIVE(__ia64_work_processed_syscall, r2, p7)
+ br.cond.sptk xen_work_processed_syscall
+END(xen_work_processed_syscall_with_check)
+#endif /* IA64_ASM_PARAVIRTUALIZED_XEN */
/*
* ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
@@ -153,7 +165,8 @@ END(__ia64_switch_to)
* ar.csd: cleared
* ar.ssd: cleared
*/
-GLOBAL_ENTRY(__ia64_leave_syscall)
+GLOBAL_ENTRY(__paravirt_leave_syscall)
+ BR_IF_NATIVE(__ia64_leave_syscall, r22, p7)
PT_REGS_UNWIND_INFO(0)
/*
* work.need_resched etc. mustn't get changed by this CPU before it
returns to
@@ -177,12 +190,12 @@ GLOBAL_ENTRY(__ia64_leave_syscall)
;;
cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
#else /* !CONFIG_PREEMPT */
-(pUStk) rsm psr.i
+ RSM_PSR_I(pUStk, r2, r18)
cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
#endif
-.global __ia64_work_processed_syscall;
-__ia64_work_processed_syscall:
+.global __paravirt_work_processed_syscall;
+__paravirt_work_processed_syscall:
adds r2=PT(LOADRS)+16,r12
adds r3=PT(AR_BSPSTORE)+16,r12
adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
@@ -205,7 +218,7 @@ __ia64_work_processed_syscall:
(pNonSys) break 0 // bug check: we shouldn't be here if
pNonSys is TRUE!
;;
invala // M0|1 invalidate ALAT
- rsm psr.i | psr.ic // M2 turn off interrupts and interruption
collection
+ RSM_PSR_I_IC(r28, r29, r30) // M2 turn off interrupts and
interruption collection
cmp.eq p9,p0=r0,r0 // A set p9 to indicate that we should
restore cr.ifs
ld8 r29=[r2],16 // M0|1 load cr.ipsr
@@ -217,7 +230,7 @@ __ia64_work_processed_syscall:
(pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
;;
ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs
-(pKStk) mov r22=psr // M2 read PSR now that
interrupts are disabled
+ MOV_FROM_PSR(pKStk, r22, r21) // M2 read PSR now that interrupts
are disabled
nop 0
;;
ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
@@ -246,7 +259,7 @@ __ia64_work_processed_syscall:
srlz.d // M0 ensure interruption collection
is off (for cover)
shr.u r18=r19,16 // I0|1 get byte size of existing
"dirty" partition
- cover // B add current frame into dirty
partition & set cr.ifs
+ COVER // B add current frame into dirty
partition & set cr.ifs
;;
mov r19=ar.bsp // M2 get new backing store pointer
mov f10=f0 // F clear f10
@@ -261,9 +274,10 @@ __ia64_work_processed_syscall:
mov.m ar.ssd=r0 // M2 clear ar.ssd
mov f11=f0 // F clear f11
br.cond.sptk.many rbs_switch // B
-END(__ia64_leave_syscall)
+END(__paravirt_leave_syscall)
-GLOBAL_ENTRY(__ia64_leave_kernel)
+GLOBAL_ENTRY(__paravirt_leave_kernel)
+ BR_IF_NATIVE(__ia64_leave_kernel, r22, p7)
PT_REGS_UNWIND_INFO(0)
/*
* work.need_resched etc. mustn't get changed by this CPU before it
returns to
@@ -287,7 +301,7 @@ GLOBAL_ENTRY(__ia64_leave_kernel)
;;
cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
#else
-(pUStk) rsm psr.i
+ RSM_PSR_I(pUStk, r17, r31)
cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
#endif
@@ -335,7 +349,7 @@ GLOBAL_ENTRY(__ia64_leave_kernel)
mov ar.csd=r30
mov ar.ssd=r31
;;
- rsm psr.i | psr.ic // initiate turning off of interrupt and
interruption collection
+ RSM_PSR_I_IC(r23, r22, r25) // initiate turning off of interrupt
and interruption collection
invala // invalidate ALAT
;;
ld8.fill r22=[r2],24
@@ -367,13 +381,13 @@ GLOBAL_ENTRY(__ia64_leave_kernel)
mov ar.ccv=r15
;;
ldf.fill f11=[r2]
- bsw.0 // switch back to bank 0 (no stop bit required
beforehand...)
+ BSW_0(r2, r3, r15) // switch back to bank 0 (no stop bit required
beforehand...)
;;
(pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
adds r16=PT(CR_IPSR)+16,r12
adds r17=PT(CR_IIP)+16,r12
-(pKStk) mov r22=psr // M2 read PSR now that interrupts are
disabled
+ MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are
disabled
nop.i 0
nop.i 0
;;
@@ -421,7 +435,7 @@ GLOBAL_ENTRY(__ia64_leave_kernel)
* NOTE: alloc, loadrs, and cover can't be predicated.
*/
(pNonSys) br.cond.dpnt dont_preserve_current_frame
- cover // add current frame into dirty
partition and set cr.ifs
+ COVER // add current frame into dirty
partition and set cr.ifs
;;
mov r19=ar.bsp // get new backing store pointer
rbs_switch:
@@ -524,16 +538,16 @@ skip_rbs_switch:
(pKStk) dep r29=r22,r29,21,1 // I0 update ipsr.pp with psr.pp
(pLvSys)mov r16=r0 // A clear r16 for leave_syscall, no-op
otherwise
;;
- mov cr.ipsr=r29 // M2
+ MOV_TO_IPSR(r29, r25) // M2
mov ar.pfs=r26 // I0
(pLvSys)mov r17=r0 // A clear r17 for leave_syscall, no-op
otherwise
-(p9) mov cr.ifs=r30 // M2
+ MOV_TO_IFS(p9, r30, r25)// M2
mov b0=r21 // I0
(pLvSys)mov r18=r0 // A clear r18 for leave_syscall, no-op
otherwise
mov ar.fpsr=r20 // M2
- mov cr.iip=r28 // M2
+ MOV_TO_IIP(r28, r25) // M2
nop 0
;;
(pUStk) mov ar.rnat=r24 // M2 must happen with RSE in lazy mode
@@ -542,7 +556,7 @@ skip_rbs_switch:
mov ar.rsc=r27 // M2
mov pr=r31,-1 // I0
- rfi // B
+ RFI // B
/*
* On entry:
@@ -568,28 +582,28 @@ skip_rbs_switch:
#endif
br.call.spnt.many rp=schedule
.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1
- rsm psr.i // disable interrupts
+ RSM_PSR_I(p0, r2, r20) // disable interrupts
;;
#ifdef CONFIG_PREEMPT
(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
;;
(pKStk) st4 [r20]=r0 // preempt_count() <- 0
#endif
-(pLvSys)br.cond.sptk.few ia64_work_pending_syscall_end
+(pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
br.cond.sptk.many .work_processed_kernel // re-check
.notify:
(pUStk) br.call.spnt.many rp=notify_resume_user
.ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0
-(pLvSys)br.cond.sptk.few ia64_work_pending_syscall_end
+(pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
br.cond.sptk.many .work_processed_kernel // don't re-check
-.global ia64_work_pending_syscall_end;
-ia64_work_pending_syscall_end:
+.global __paravirt_pending_syscall_end;
+__paravirt_pending_syscall_end:
adds r2=PT(R8)+16,r12
adds r3=PT(R10)+16,r12
;;
ld8 r8=[r2]
ld8 r10=[r3]
- br.cond.sptk.many ia64_work_processed_syscall // re-check
-END(__ia64_leave_kernel)
+ br.cond.sptk.many __paravirt_work_processed_syscall_target //
re-check
+END(__paravirt_leave_kernel)
--
1.5.3
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