/* * 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)