locore.S revision 1.1 
1/*	$NetBSD: locore.S,v 1.1 2026/01/09 22:54:28 jmcneill Exp $	*/
2/*	$OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $	*/
3
4/*
5 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
6 * Copyright (C) 1995, 1996 TooLs GmbH.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by TooLs GmbH.
20 * 4. The name of TooLs GmbH may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include "opt_ddb.h"
36#include "opt_kgdb.h"
37#include "opt_ppcparam.h"
38#include "assym.h"
39
40#include <sys/syscall.h>
41
42#include <machine/param.h>
43#include <machine/psl.h>
44#include <machine/trap.h>
45#include <machine/asm.h>
46
47#include <powerpc/spr.h>
48#include <powerpc/oea/spr.h>
49#include <powerpc/oea/hid.h>
50
51#include "ksyms.h"
52
53/*
54 * Some instructions gas doesn't understand (yet?)
55 */
56#define	bdneq	bdnzf 2,
57
58/*
59 * Globals
60 */
61GLOBAL(startsym)
62	.long	0			/* start symbol table */
63GLOBAL(endsym)
64	.long	0			/* end symbol table */
65/*
66 * This symbol is here for the benefit of kvm_mkdb, and is supposed to
67 * mark the start of kernel text.
68 */
69	.text
70	.globl	_C_LABEL(kernel_text)
71_C_LABEL(kernel_text):
72
73/*
74 * Startup entry.  Note, this must be the first thing in the text
75 * segment!
76 */
77	.text
78	.globl	__start
79__start:
80	b	__mmu_init
81
82	/*
83	 * Command-line argument protocol supported by HBC.
84	 */
85	.long	0x5f617267	/* WII_ARGV_MAGIC */
86	.globl	_C_LABEL(wii_argv)
87_C_LABEL(wii_argv):
88	.long	0		/* argv magic, set by loader */
89	.long	0		/* command line */
90	.long	0		/* command line length */
91	.long	0		/* argc */
92	.long	0		/* argv */
93	.long	0		/* end of argv */
94
95__mmu_init:
96	/* reset MMU to a known state */
97#include "mmuinit.S"
98
99	/* compute end of kernel memory */
100	lis	%r4, _C_LABEL(end)@ha
101	addi	%r4, %r4, _C_LABEL(end)@l
102
103#if NKSYMS || defined(DDB) || defined(MODULAR)
104	/* If we had symbol table location we'd store it here and would've adjusted r4 here */
105	lis	%r7, _C_LABEL(startsym)@ha
106	addi	%r7, %r7, _C_LABEL(startsym)@l
107	stw	%r4, 0(%r7)
108	lis	%r7, _C_LABEL(endsym)@ha
109	addi	%r7, %r7,_C_LABEL(endsym)@l
110	stw	%r4, 0(%r7)
111#endif
112
113	lis	%r1, 0
114	INIT_CPUINFO(%r4, %r1, %r9, %r0)
115
116	lis	%r3, __start@ha
117	addi	%r3, %r3, __start@l
118
119	xor	%r5, %r5, %r5
120	xor	%r6, %r6, %r6
121	bl	_C_LABEL(initppc)
122
123	sync
124	isync
125	mfspr	%r8, SPR_HID0
126	ori	%r8, %r8, (HID0_ICE | HID0_DCE)@l
127	isync
128	mtspr	SPR_HID0, %r8
129	sync
130	isync
131
132	bl	_C_LABEL(main)
133
134loop:	b	loop			/* XXX not reached */
135
136	.globl	_C_LABEL(enable_intr)
137_C_LABEL(enable_intr):
138	mfmsr	%r3
139	ori	%r3, %r3, PSL_EE@l
140	mtmsr	%r3
141	blr
142
143	.globl	_C_LABEL(disable_intr)
144_C_LABEL(disable_intr):
145	mfmsr	%r3
146 	andi.	%r3, %r3, ~PSL_EE@l
147	mtmsr	%r3
148	blr
149
150/*
151 * Include common switch / setfault code
152 */
153#include <powerpc/powerpc/locore_subr.S>
154
155/*
156 * Include common trap / exception code
157 */
158#include <powerpc/powerpc/trap_subr.S>
159
160/*
161 * Include PIO routines
162 */
163#include <powerpc/powerpc/pio_subr.S>
164