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ia64/pv_ops/xen: paravirtualize ivt.S for xen.

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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>
This commit is contained in:
Isaku Yamahata 2008-10-17 11:18:03 +09:00 committed by Tony Luck
parent 21820cce17
commit 5142ec4690
3 changed files with 68 additions and 1 deletions
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1
arch/ia64/include/asm/xen/inst.h
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@ -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) \

16
arch/ia64/xen/Makefile
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@ -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)

52
arch/ia64/xen/xenivt.S Normal file
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@ -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)