mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
5142ec4690
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>
52 lines
1.2 KiB
ArmAsm
52 lines
1.2 KiB
ArmAsm
/*
|
|
* 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)
|