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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/asm_linkage.h>
#include <sys/machthread.h>
#include <sys/asi.h>
#include <sys/privregs.h>
#include <sys/spitregs.h>
#include "assym.h"
/*
* fhc_shutdown_asm(u_longlong_t base, int size)
*
* Flush cpu E$ then shutdown.
* This function is special in that it really sets the D-tags to
* a known state. And this is the behavior we're looking for.
*
* The flush address is known to be a cpu-unique non-existent
* cacheable address. We write to non-existent memory, using
* the side effect of d-tag invalidation.
*
* Also, note that this function is never run from main memory.
* Rather it is copied to non-cacheable SRAM (hence the ..._end
* label at the bottom of the function). This implies that the
* function must be position independent code that doesn't reference
* cacheable real memory.
*/
ENTRY(fhc_shutdown_asm)
! turn off errors (we'll be writing to non-existent memory)
stxa %g0, [%g0]ASI_ESTATE_ERR
membar #Sync ! SYNC
rdpr %pstate, %o4
andn %o4, PSTATE_IE | PSTATE_AM, %o3
wrpr %o3, %g0, %pstate
1:
brlez,pn %o1, 2f ! if (len <= 0) exit loop
dec 64, %o1 ! size -= 64
sta %g0, [%o0]ASI_MEM ! store (unpopulated) word
ba 1b
inc 64, %o0 ! addr += 64
2:
membar #Sync ! SYNC
shutdown ! SHUTDOWN
/*NOTREACHED*/
! if, for some reason, this cpu doesn't shutdown, just sit here
3:
ba 3b
nop ! eventually the master will notice
SET_SIZE(fhc_shutdown_asm)
.global fhc_shutdown_asm_end
fhc_shutdown_asm_end:
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