1/*-
2 * Copyright (c) 2001 Jake Burkholder.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <machine/asm.h>
28__FBSDID("$FreeBSD$");
29
30#include <machine/asi.h>
31#include <machine/asmacros.h>
32#include <machine/intr_machdep.h>
33#include <machine/pstate.h>
34#include <machine/wstate.h>
35
36#include "assym.s"
37
38	.register %g2,#ignore
39
40	.globl	kernbase
41	.set	kernbase, KERNBASE
42
43/*
44 * void _start(caddr_t metadata, u_long o1, u_long o2, u_long o3,
45 *     u_long ofw_vec)
46 */
47ENTRY(btext)
48ENTRY(_start)
49	/*
50	 * Initialize misc. state to known values: interrupts disabled, normal
51	 * globals, windows flushed (cr = 0, cs = nwindows - 1), PIL_TICK and
52	 * floating point disabled.
53	 * Note that some firmware versions don't implement a clean window
54	 * trap handler so we unfortunately can't clear the windows by setting
55	 * %cleanwin to zero here.
56	 */
57	wrpr	%g0, PSTATE_NORMAL, %pstate
58	flushw
59	wrpr	%g0, PIL_TICK, %pil
60	wr	%g0, 0, %fprs
61
62	/*
63	 * Get onto our per-CPU panic stack, which precedes the struct pcpu in
64	 * the per-CPU page.
65	 */
66	SET(pcpu0 + (PCPU_PAGES * PAGE_SIZE) - PC_SIZEOF, %l1, %l0)
67	sub	%l0, SPOFF + CCFSZ, %sp
68
69	/*
70	 * Do initial bootstrap to setup pmap and thread0.
71	 */
72	call	sparc64_init
73	 nop
74
75	/*
76	 * Get onto thread0's kstack.
77	 */
78	sub	PCB_REG, SPOFF + CCFSZ, %sp
79
80	/*
81	 * And away we go.  This doesn't return.
82	 */
83	call	mi_startup
84	 nop
85	sir
86	! NOTREACHED
87END(_start)
88
89/*
90 * void cpu_setregs(struct pcpu *pc)
91 */
92ENTRY(cpu_setregs)
93	ldx	[%o0 + PC_CURPCB], %o1
94
95	/*
96	 * Ensure we are on normal globals.
97	 */
98	wrpr	%g0, PSTATE_NORMAL, %pstate
99
100	/*
101	 * Normal %g6 points to the current thread's PCB, and %g7 points to
102	 * the per-CPU data structure.
103	 */
104	mov	%o1, PCB_REG
105	mov	%o0, PCPU_REG
106
107	/*
108	 * Switch to alternate globals.
109	 */
110	wrpr	%g0, PSTATE_ALT, %pstate
111
112	/*
113	 * Alternate %g5 points to a per-CPU panic stack, %g6 points to the
114	 * current thread's PCB, and %g7 points to the per-CPU data structure.
115	 */
116	mov	%o0, ASP_REG
117	mov	%o1, PCB_REG
118	mov	%o0, PCPU_REG
119
120	/*
121	 * Switch to interrupt globals.
122	 */
123	wrpr	%g0, PSTATE_INTR, %pstate
124
125	/*
126	 * Interrupt %g7 points to the per-CPU data structure.
127	 */
128	mov	%o0, PCPU_REG
129
130	/*
131	 * Switch to normal globals again.
132	 */
133	wrpr	%g0, PSTATE_NORMAL, %pstate
134
135	/*
136	 * Force trap level 1 and take over the trap table.
137	 */
138	SET(tl0_base, %o2, %o1)
139	SET(tba_taken_over, %o3, %o2)
140	mov	1, %o3
141	wrpr	%g0, WSTATE_KERNEL, %wstate
142	wrpr	%g0, 1, %tl
143	wrpr	%o1, 0, %tba
144	stw	%o3, [%o2]
145
146	retl
147	 nop
148END(cpu_setregs)
149