ia64/pv_ops/xen: paravirtualize ivt.S for xen.
Isaku Yamahata [Fri, 17 Oct 2008 02:18:03 +0000 (11:18 +0900)]
paravirtualize ivt.S for xen by multi compile.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/include/asm/xen/inst.h
arch/ia64/xen/Makefile
arch/ia64/xen/xenivt.S [new file with mode: 0644]

index 1e92ed0..e6a25c3 100644 (file)
@@ -22,6 +22,7 @@
 
 #include <asm/xen/privop.h>
 
+#define ia64_ivt                               xen_ivt
 #define DO_SAVE_MIN                            XEN_DO_SAVE_MIN
 
 #define MOV_FROM_IFA(reg)      \
index 7cb4247..5c87e4a 100644 (file)
@@ -2,5 +2,19 @@
 # Makefile for Xen components
 #
 
-obj-y := hypercall.o xensetup.o xen_pv_ops.o \
+obj-y := hypercall.o xenivt.o xensetup.o xen_pv_ops.o \
         hypervisor.o xencomm.o xcom_hcall.o grant-table.o
+
+AFLAGS_xenivt.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN
+
+# xen multi compile
+ASM_PARAVIRT_MULTI_COMPILE_SRCS = ivt.S
+ASM_PARAVIRT_OBJS = $(addprefix xen-,$(ASM_PARAVIRT_MULTI_COMPILE_SRCS:.S=.o))
+obj-y += $(ASM_PARAVIRT_OBJS)
+define paravirtualized_xen
+AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_XEN
+endef
+$(foreach o,$(ASM_PARAVIRT_OBJS),$(eval $(call paravirtualized_xen,$(o))))
+
+$(obj)/xen-%.o: $(src)/../kernel/%.S FORCE
+       $(call if_changed_dep,as_o_S)
diff --git a/arch/ia64/xen/xenivt.S b/arch/ia64/xen/xenivt.S
new file mode 100644 (file)
index 0000000..3e71d50
--- /dev/null
@@ -0,0 +1,52 @@
+/*
+ * arch/ia64/xen/ivt.S
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *     Dan Magenheimer <dan.magenheimer@hp.com>
+ *
+ * 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>
+
+#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 xen_leave_kernel   // we know ia64_leave_kernel is
+                                       // paravirtualized as xen_leave_kernel
+END(xen_event_callback)