xref: /titanic_51/usr/src/uts/sun4u/sunfire/ml/fhc_asm.s (revision 29949e866e40b95795203f3ee46f44a197c946e4)
1*29949e86Sstevel/*
2*29949e86Sstevel * CDDL HEADER START
3*29949e86Sstevel *
4*29949e86Sstevel * The contents of this file are subject to the terms of the
5*29949e86Sstevel * Common Development and Distribution License (the "License").
6*29949e86Sstevel * You may not use this file except in compliance with the License.
7*29949e86Sstevel *
8*29949e86Sstevel * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*29949e86Sstevel * or http://www.opensolaris.org/os/licensing.
10*29949e86Sstevel * See the License for the specific language governing permissions
11*29949e86Sstevel * and limitations under the License.
12*29949e86Sstevel *
13*29949e86Sstevel * When distributing Covered Code, include this CDDL HEADER in each
14*29949e86Sstevel * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*29949e86Sstevel * If applicable, add the following below this CDDL HEADER, with the
16*29949e86Sstevel * fields enclosed by brackets "[]" replaced with your own identifying
17*29949e86Sstevel * information: Portions Copyright [yyyy] [name of copyright owner]
18*29949e86Sstevel *
19*29949e86Sstevel * CDDL HEADER END
20*29949e86Sstevel */
21*29949e86Sstevel
22*29949e86Sstevel/*
23*29949e86Sstevel * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
24*29949e86Sstevel * Use is subject to license terms.
25*29949e86Sstevel */
26*29949e86Sstevel
27*29949e86Sstevel#pragma ident	"%Z%%M%	%I%	%E% SMI"
28*29949e86Sstevel
29*29949e86Sstevel#include <sys/param.h>
30*29949e86Sstevel#include <sys/errno.h>
31*29949e86Sstevel#include <sys/asm_linkage.h>
32*29949e86Sstevel#include <sys/machthread.h>
33*29949e86Sstevel#include <sys/asi.h>
34*29949e86Sstevel#include <sys/privregs.h>
35*29949e86Sstevel#include <sys/spitregs.h>
36*29949e86Sstevel
37*29949e86Sstevel#if defined(lint)
38*29949e86Sstevel
39*29949e86Sstevel#else	/* lint */
40*29949e86Sstevel#include "assym.h"
41*29949e86Sstevel#endif	/* lint */
42*29949e86Sstevel
43*29949e86Sstevel/*
44*29949e86Sstevel * fhc_shutdown_asm(u_longlong_t base, int size)
45*29949e86Sstevel *
46*29949e86Sstevel * Flush cpu E$ then shutdown.
47*29949e86Sstevel * This function is special in that it really sets the D-tags to
48*29949e86Sstevel * a known state.  And this is the behavior we're looking for.
49*29949e86Sstevel *
50*29949e86Sstevel * The flush address is known to be a cpu-unique non-existent
51*29949e86Sstevel * cacheable address.  We write to non-existent memory, using
52*29949e86Sstevel * the side effect of d-tag invalidation.
53*29949e86Sstevel *
54*29949e86Sstevel * Also, note that this function is never run from main memory.
55*29949e86Sstevel * Rather it is copied to non-cacheable SRAM (hence the ..._end
56*29949e86Sstevel * label at the bottom of the function).  This implies that the
57*29949e86Sstevel * function must be position independent code that doesn't reference
58*29949e86Sstevel * cacheable real memory.
59*29949e86Sstevel */
60*29949e86Sstevel#if defined(lint)
61*29949e86Sstevel
62*29949e86Sstevel/*ARGSUSED*/
63*29949e86Sstevelvoid
64*29949e86Sstevelfhc_shutdown_asm(u_longlong_t base, int size)
65*29949e86Sstevel{}
66*29949e86Sstevel
67*29949e86Sstevel#else	/* lint */
68*29949e86Sstevel
69*29949e86Sstevel	ENTRY(fhc_shutdown_asm)
70*29949e86Sstevel	! turn off errors (we'll be writing to non-existent memory)
71*29949e86Sstevel	stxa	%g0, [%g0]ASI_ESTATE_ERR
72*29949e86Sstevel	membar	#Sync			! SYNC
73*29949e86Sstevel
74*29949e86Sstevel	rdpr	%pstate, %o4
75*29949e86Sstevel	andn	%o4, PSTATE_IE | PSTATE_AM, %o3
76*29949e86Sstevel	wrpr	%o3, %g0, %pstate
77*29949e86Sstevel1:
78*29949e86Sstevel	brlez,pn %o1, 2f		! if (len <= 0) exit loop
79*29949e86Sstevel	  dec	64, %o1			! size -= 64
80*29949e86Sstevel        sta     %g0, [%o0]ASI_MEM	! store (unpopulated) word
81*29949e86Sstevel	ba	1b
82*29949e86Sstevel	  inc	64, %o0			! addr += 64
83*29949e86Sstevel2:
84*29949e86Sstevel	membar  #Sync			! SYNC
85*29949e86Sstevel	shutdown			! SHUTDOWN
86*29949e86Sstevel	/*NOTREACHED*/
87*29949e86Sstevel
88*29949e86Sstevel	! if, for some reason, this cpu doesn't shutdown, just sit here
89*29949e86Sstevel3:
90*29949e86Sstevel	ba	3b
91*29949e86Sstevel	  nop				! eventually the master will notice
92*29949e86Sstevel	SET_SIZE(fhc_shutdown_asm)
93*29949e86Sstevel
94*29949e86Sstevel	.global	fhc_shutdown_asm_end
95*29949e86Sstevelfhc_shutdown_asm_end:
96*29949e86Sstevel
97*29949e86Sstevel#endif	/* lint */
98