[Xen-ia64-devel] [PATCH 26/28] ia64/xen: fsys paravirtualization.

[yamahata@xxxxxxxxxxxxx]

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/kernel/fsys.S |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index 4484197..7d97e37 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -570,11 +570,34 @@ ENTRY(fsys_fallback_syscall)
        adds r17=-1024,r15
        movl r14=sys_call_table
        ;;
+#ifdef CONFIG_XEN
+       movl r18=running_on_xen;;
+       ld4 r18=[r18];;
+       // p14 = running_on_xen
+       // p15 = !running_on_xen
+       cmp.ne p14,p15=r0,r18
+       ;;
+(p14)  movl r18=XSI_PSR_I_ADDR;;
+(p14)  ld8 r18=[r18]
+(p14)  mov r29=1;;
+(p14)  st1 [r18]=r29
+(p15)  rsm psr.i
+#else
        rsm psr.i
+#endif
        shladd r18=r17,3,r14
        ;;
        ld8 r18=[r18]                           // load normal (heavy-weight) 
syscall entry-point
+#ifdef CONFIG_XEN
+(p14)  mov r27=r8
+(p14)  XEN_HYPER_GET_PSR
+       ;;
+(p14)  mov r29=r8
+(p14)  mov r8=r27
+(p15)  mov r29=psr                             // read psr (12 cyc load 
latency)
+#else
        mov r29=psr                             // read psr (12 cyc load 
latency)
+#endif
        mov r27=ar.rsc
        mov r21=ar.fpsr
        mov r26=ar.pfs
@@ -686,7 +709,25 @@ GLOBAL_ENTRY(fsys_bubble_down)
        mov rp=r14                              // I0   set the real return addr
        and r3=_TIF_SYSCALL_TRACEAUDIT,r3       // A
        ;;
+#ifdef CONFIG_XEN
+       movl r14=running_on_xen;;
+       ld4 r14=[r14];;
+       // p14 = running_on_xen
+       // p15 = !running_on_xen
+       cmp.ne p14,p15=r0,r14
+       ;;
+(p14)  movl r28=XSI_PSR_I_ADDR;;
+(p14)  ld8 r28=[r28];;
+(p14)  adds r28=-1,r28;;                       // event_pending
+(p14)  ld1 r14=[r28];;
+(p14)  cmp.ne.unc p13,p14=r14,r0;;
+(p13)  XEN_HYPER_SSM_I
+(p14)  adds r28=1,r28;;                        // event_mask
+(p14)  st1 [r28]=r0;;
+(p15)  ssm psr.i
+#else
        ssm psr.i                               // M2   we're on kernel stacks 
now, reenable irqs
+#endif
        cmp.eq p8,p0=r3,r0                      // A
 (p10)  br.cond.spnt.many ia64_ret_from_syscall // B    return if bad 
call-frame or r15 is a NaT
 
-- 
1.5.3

-- 
yamahata

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