[Xen-changelog] More hyperprivop stuff

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1713.2.5, 2005/06/17 10:18:11-06:00, djm@xxxxxxxxxxxxxxx

        More hyperprivop stuff
        Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxx>



 asm-offsets.c |    1 
 hyperprivop.S |   66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 65 insertions(+), 2 deletions(-)


diff -Nru a/xen/arch/ia64/asm-offsets.c b/xen/arch/ia64/asm-offsets.c
--- a/xen/arch/ia64/asm-offsets.c       2005-06-23 07:03:15 -04:00
+++ b/xen/arch/ia64/asm-offsets.c       2005-06-23 07:03:15 -04:00
@@ -59,6 +59,7 @@
        DEFINE(XSI_INCOMPL_REG_OFS, offsetof(vcpu_info_t, 
arch.incomplete_regframe));
        DEFINE(XSI_PEND_OFS, offsetof(vcpu_info_t, arch.pending_interruption));
        DEFINE(XSI_RR0_OFS, offsetof(vcpu_info_t, arch.rrs[0]));
+       DEFINE(XSI_TPR_OFS, offsetof(vcpu_info_t, arch.tpr));
        //DEFINE(IA64_TASK_BLOCKED_OFFSET,offsetof (struct task_struct, 
blocked));
        //DEFINE(IA64_TASK_CLEAR_CHILD_TID_OFFSET,offsetof (struct task_struct, 
clear_child_tid));
        //DEFINE(IA64_TASK_GROUP_LEADER_OFFSET, offsetof (struct task_struct, 
group_leader));
diff -Nru a/xen/arch/ia64/hyperprivop.S b/xen/arch/ia64/hyperprivop.S
--- a/xen/arch/ia64/hyperprivop.S       2005-06-23 07:03:15 -04:00
+++ b/xen/arch/ia64/hyperprivop.S       2005-06-23 07:03:15 -04:00
@@ -69,7 +69,6 @@
        cmp.ne p7,p0=r20,r0
 (p7)   br.spnt.many dispatch_break_fault ;;
 
-// hard to test, because only called from rbs_switch
        // HYPERPRIVOP_COVER?
        cmp.eq p7,p6=XEN_HYPER_COVER,r17
 (p7)   br.sptk.many hyper_cover;;
@@ -82,6 +81,14 @@
        cmp.eq p7,p6=XEN_HYPER_RSM_DT,r17
 (p7)   br.sptk.many hyper_rsm_dt;;
 
+       // HYPERPRIVOP_GET_TPR?
+       cmp.eq p7,p6=XEN_HYPER_GET_TPR,r17
+(p7)   br.sptk.many hyper_get_tpr;;
+
+       // HYPERPRIVOP_SET_TPR?
+       cmp.eq p7,p6=XEN_HYPER_SET_TPR,r17
+(p7)   br.sptk.many hyper_set_tpr;;
+
        // if not one of the above, give up for now and do it the slow way
        br.sptk.many dispatch_break_fault ;;
 
@@ -455,7 +462,6 @@
        rfi
        ;;
 
-#if 1
 // return from metaphysical mode (meta=1) to virtual mode (meta=0)
 ENTRY(hyper_ssm_dt)
 #ifdef FAST_HYPERPRIVOP_CNT
@@ -526,4 +532,60 @@
        mov pr=r31,-1 ;;
        rfi
        ;;
+
+ENTRY(hyper_get_tpr)
+#ifdef FAST_HYPERPRIVOP_CNT
+       movl r20=fast_hyperpriv_cnt+(8*XEN_HYPER_GET_TPR);;
+       ld8 r21=[r20];;
+       adds r21=1,r21;;
+       st8 [r20]=r21;;
+#endif
+       mov r24=cr.ipsr
+       mov r25=cr.iip;;
+       adds r20=XSI_TPR_OFS-XSI_PSR_IC_OFS,r18 ;;
+       ld8 r8=[r20];;
+       extr.u r26=r24,41,2 ;;
+       cmp.eq p6,p7=2,r26 ;;
+(p6)   mov r26=0
+(p6)   adds r25=16,r25
+(p7)   adds r26=1,r26
+       ;;
+       dep r24=r26,r24,41,2
+       ;;
+       mov cr.ipsr=r24
+       mov cr.iip=r25
+       mov pr=r31,-1 ;;
+       rfi
+       ;;
+END(hyper_get_tpr)
+
+// if we get to here, there are no interrupts pending so we
+// can change virtual tpr to any value without fear of provoking
+// (or accidentally missing) delivering an interrupt
+ENTRY(hyper_set_tpr)
+#ifdef FAST_HYPERPRIVOP_CNT
+       movl r20=fast_hyperpriv_cnt+(8*XEN_HYPER_SET_TPR);;
+       ld8 r21=[r20];;
+       adds r21=1,r21;;
+       st8 [r20]=r21;;
 #endif
+       mov r24=cr.ipsr
+       mov r25=cr.iip;;
+       movl r27=0xff00;;
+       adds r20=XSI_TPR_OFS-XSI_PSR_IC_OFS,r18 ;;
+       andcm r8=r8,r27;;
+       st8 [r20]=r8;;
+       extr.u r26=r24,41,2 ;;
+       cmp.eq p6,p7=2,r26 ;;
+(p6)   mov r26=0
+(p6)   adds r25=16,r25
+(p7)   adds r26=1,r26
+       ;;
+       dep r24=r26,r24,41,2
+       ;;
+       mov cr.ipsr=r24
+       mov cr.iip=r25
+       mov pr=r31,-1 ;;
+       rfi
+       ;;
+END(hyper_set_tpr)

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