[Xen-ia64-devel] [PATCH 34/50] ia64/xen: helper functions for xen fault handlers.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/xen/xenivt.S |   59 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 59 insertions(+), 0 deletions(-)
 create mode 100644 arch/ia64/xen/xenivt.S

diff --git a/arch/ia64/xen/xenivt.S b/arch/ia64/xen/xenivt.S
new file mode 100644
index 0000000..99bb37a
--- /dev/null
+++ b/arch/ia64/xen/xenivt.S
@@ -0,0 +1,59 @@
+/*
+ * arch/ia64/xen/ivt.S
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *     Dan Magenheimer <dan.magenheimer@xxxxxx>
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/kregs.h>
+#include <asm/pgtable.h>
+
+#define __IA64_ASM_PARAVIRTUALIZED_XEN
+#include "inst_xen.h"
+#include "xenminstate.h"
+#include "../kernel/minstate.h"
+
+       .section .text,"ax"
+GLOBAL_ENTRY(xen_event_callback)
+       mov r31=pr              // prepare to save predicates
+       ;;
+       SAVE_MIN_WITH_COVER     // uses r31; defines r2 and r3
+       ;;
+       movl r3=XSI_PSR_IC
+       mov r14=1
+       ;;
+       st4 [r3]=r14
+       ;;
+       adds r3=8,r2            // set up second base pointer for SAVE_REST
+       srlz.i                  // ensure everybody knows psr.ic is back on
+       ;;
+       SAVE_REST
+       ;;
+1:
+       alloc r14=ar.pfs,0,0,1,0 // must be first in an insn group
+       add out0=16,sp          // pass pointer to pt_regs as first arg
+       ;;
+       br.call.sptk.many b0=xen_evtchn_do_upcall
+       ;;
+       movl r20=XSI_PSR_I_ADDR
+       ;;
+       ld8 r20=[r20]
+       ;;
+       adds r20=-1,r20         // vcpu_info->evtchn_upcall_pending
+       ;;
+       ld1 r20=[r20]
+       ;;
+       cmp.ne p6,p0=r20,r0     // if there are pending events,
+       (p6) br.spnt.few 1b     // call evtchn_do_upcall again.
+       br.sptk.many ia64_leave_kernel
+END(xen_event_callback)
+
+GLOBAL_ENTRY(xen_bsw1)
+       XEN_BSW_1(r14)
+       br.ret.sptk.many b0
+END(xen_bsw1)
-- 
1.5.3


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