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