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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/ia64/xen/xenivt.S
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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 <[email protected]>

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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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