xref: /freebsd/sys/powerpc/aim/locore.S (revision dc9d16844c13cbe99ea9cdd0057b048e5b5a68bf)
1/* $FreeBSD$ */
2/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
3
4/*-
5 * Copyright (C) 2001 Benno Rice
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28/*-
29 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
30 * Copyright (C) 1995, 1996 TooLs GmbH.
31 * All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 *    notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 *    notice, this list of conditions and the following disclaimer in the
40 *    documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 *    must display the following acknowledgement:
43 *	This product includes software developed by TooLs GmbH.
44 * 4. The name of TooLs GmbH may not be used to endorse or promote products
45 *    derived from this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
50 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
52 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
53 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
54 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
55 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
56 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
57 */
58
59#include "assym.s"
60
61#include <sys/syscall.h>
62
63#include <machine/trap.h>
64#include <machine/param.h>
65#include <machine/sr.h>
66#include <machine/spr.h>
67#include <machine/psl.h>
68#include <machine/asm.h>
69
70/* Locate the per-CPU data structure */
71#define GET_CPUINFO(r)  \
72        mfsprg0  r
73
74/*
75 * Compiled KERNBASE location and the kernel load address
76 */
77        .globl  kernbase
78        .set    kernbase, KERNBASE
79
80#define	TMPSTKSZ	8192		/* 8K temporary stack */
81
82/*
83 * Globals
84 */
85	.data
86	.align	4
87GLOBAL(tmpstk)
88	.space	TMPSTKSZ
89GLOBAL(esym)
90	.long	0			/* end of symbol table */
91
92GLOBAL(ofmsr)
93	.long	0, 0, 0, 0, 0		/* msr/sprg0-3 used in Open Firmware */
94
95#define	INTRCNT_COUNT	256		/* max(HROWPIC_IRQMAX,OPENPIC_IRQMAX) */
96GLOBAL(intrnames)
97	.space	INTRCNT_COUNT * (MAXCOMLEN + 1) * 2
98GLOBAL(eintrnames)
99	.align 4
100GLOBAL(intrcnt)
101	.space	INTRCNT_COUNT * 4 * 2
102GLOBAL(eintrcnt)
103
104/*
105 * File-scope for locore.S
106 */
107idle_u:
108	.long	0			/* fake uarea during idle after exit */
109openfirmware_entry:
110	.long	0			/* Open Firmware entry point */
111srsave:
112	.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
113
114	.text
115	.globl	btext
116btext:
117
118/*
119 * This symbol is here for the benefit of kvm_mkdb, and is supposed to
120 * mark the start of kernel text.
121 */
122	.globl	kernel_text
123kernel_text:
124
125/*
126 * Startup entry.  Note, this must be the first thing in the text
127 * segment!
128 */
129	.text
130	.globl	__start
131__start:
132#ifdef	FIRMWORKSBUGS
133	mfmsr	0
134	andi.	0,0,PSL_IR|PSL_DR
135	beq	1f
136
137	bl	ofwr_init
1381:
139#endif
140	li	8,0
141	li	9,0x100
142	mtctr	9
1431:
144	dcbf	0,8
145	icbi	0,8
146	addi	8,8,0x20
147	bdnz	1b
148	sync
149	isync
150
151	/* Save the argument pointer and length */
152	mr	20,6
153	mr	21,7
154
155	lis	8,openfirmware_entry@ha
156	stw	5,openfirmware_entry@l(8) /* save client interface handler */
157	mr	3,5
158
159	lis	1,(tmpstk+TMPSTKSZ-16)@ha
160	addi	1,1,(tmpstk+TMPSTKSZ-16)@l
161
162	mfmsr	0
163	lis	9,ofmsr@ha
164	stwu	0,ofmsr@l(9)
165
166	mfsprg0	0			/* save SPRG0-3 */
167	stw	0,4(9)			/* ofmsr[1] = sprg0 */
168	mfsprg1 0
169	stw	0,8(9)			/* ofmsr[2] = sprg1 */
170	mfsprg2 0
171	stw	0,12(9)			/* ofmsr[3] = sprg2 */
172	mfsprg3 0
173	stw	0,16(9)			/* ofmsr[4] = sprg3 */
174
175	bl	OF_init
176
177	lis	4,end@ha
178	addi	4,4,end@l
179	mr	5,4
180
181	lis	3,kernel_text@ha
182	addi	3,3,kernel_text@l
183
184	/* Restore the argument pointer and length */
185	mr	6,20
186	mr	7,21
187
188	bl	powerpc_init
189	mr	%r1, %r3
190	li	%r3, 0
191	stw	%r3, 0(%r1)
192	bl	mi_startup
193	b	OF_exit
194
195/*
196 * int setfault()
197 *
198 * Similar to setjmp to setup for handling faults on accesses to user memory.
199 * Any routine using this may only call bcopy, either the form below,
200 * or the (currently used) C code optimized, so it doesn't use any non-volatile
201 * registers.
202 */
203	.globl	setfault
204setfault:
205	mflr	0
206	mfcr	12
207	mfsprg	4,0
208	lwz	4,PC_CURTHREAD(4)
209	lwz	4,TD_PCB(4)
210	stw	3,PCB_ONFAULT(4)
211	stw	0,0(3)
212	stw	1,4(3)
213	stw	2,8(3)
214	stmw	12,12(3)
215	xor	3,3,3
216	blr
217
218#include <powerpc/aim/trap_subr.S>
219