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1.1 nbrk 1: /* $OpenBSD: srt0.S,v 1.2 2002/08/11 12:20:43 art Exp $ */
2: /* $NetBSD: srt0.S,v 1.5.4.2 1996/07/17 01:51:46 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1994 Paul Kranenburg
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: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Paul Kranenburg.
19: * 4. The name of the author may not be used to endorse or promote products
20: * derived from this software without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: #include <machine/param.h>
35: #include <machine/psl.h>
36: #include <machine/asm.h>
37:
38: #define CCFSZ 96
39:
40: .file "str0.s"
41:
42: .data
43: .global _C_LABEL(cputyp), _C_LABEL(nbpg), _C_LABEL(pgofset)
44: .global _C_LABEL(pgshift)
45: _C_LABEL(cputyp):
46: .word 1
47: _C_LABEL(nbpg):
48: .word 1
49: _C_LABEL(pgofset):
50: .word 1
51: _C_LABEL(pgshift):
52: .word 1
53:
54: .text
55: .globl start
56:
57: start:
58: /*
59: * Set up a stack.
60: */
61: set start, %o1
62: save %o1, -CCFSZ, %sp
63:
64: /*
65: * Relocate.
66: */
67: 1: call 2f
68: nop
69: 2: add %o7, (start-1b), %l0
70: set start, %l1
71: set _C_LABEL(end), %o0
72: sub %o0, %l1, %l2 ! length
73: 3: ld [%l0], %o0
74: add %l0, 4, %l0
75: st %o0, [%l1]
76: subcc %l2, 4, %l2
77: bg 3b
78: add %l1, 4, %l1
79:
80: set 4f, %g1
81: jmp %g1
82: nop
83:
84: 4:
85: #ifdef notyet
86: /*
87: * Enable traps
88: */
89: wr %g0, 0, %wim ! make sure we can set psr
90: nop; nop; nop
91: wr %g0, PSR_S|PSR_PS|PSR_PIL, %psr ! set initial psr
92: nop; nop; nop
93: wr %g0, 2, %wim ! set initial %wim (w1 invalid)
94:
95: rd %psr, %l0
96: wr %l0, PSR_ET, %psr
97: nop; nop; nop
98: #endif
99:
100: /*
101: * Clear BSS
102: */
103: set _C_LABEL(edata), %o0 ! bzero(edata, end - edata)
104: set _C_LABEL(end), %o1
105: call _C_LABEL(bzero)
106: sub %o1, %o0, %o1
107:
108: /*
109: * Enable interrupts, but only above level 11. This enables "L1-A",
110: * but avoids spurious interrupt bites from most other devices.
111: */
112: rd %psr, %o0
113: andn %o0, PSR_PIL, %o0
114: wr %o0, 0xb00, %psr ! (11 << 8)
115: nop; nop; nop
116:
117: /*
118: * Set CPU type that we are running on.
119: */
120: sethi %hi(_C_LABEL(cputyp)), %o0
121: set 0x4000, %g7
122: cmp %i0, %g7
123: beq 5f
124: nop
125:
126: /*
127: * Save address of PROM vector (passed in %i0).
128: */
129: sethi %hi(_C_LABEL(promvec)), %o1
130: st %i0, [%o1 + %lo(_C_LABEL(promvec))]
131:
132: mov CPU_SUN4C, %g4
133: mov SUN4CM_PGSHIFT, %g5
134: b,a 6f
135:
136: 5:
137: mov CPU_SUN4, %g4
138: mov SUN4_PGSHIFT, %g5
139:
140: 6:
141: st %g4, [%o0 + %lo(_C_LABEL(cputyp))]
142: sethi %hi(_C_LABEL(pgshift)), %o0 ! pgshift = log2(nbpg)
143: st %g5, [%o0 + %lo(_C_LABEL(pgshift))]
144:
145: mov 1, %o0 ! nbpg = 1 << pgshift
146: sll %o0, %g5, %g5
147: sethi %hi(_C_LABEL(nbpg)), %o0 ! nbpg = bytes in a page
148: st %g5, [%o0 + %lo(_C_LABEL(nbpg))]
149:
150: sub %g5, 1, %g5
151: sethi %hi(_C_LABEL(pgofset)), %o0 ! page offset = bytes in a page - 1
152: st %g5, [%o0 + %lo(_C_LABEL(pgofset))]
153:
154: call _C_LABEL(main)
155: mov %i0, %o0
156:
157: ret
158: restore
159:
160:
161: #ifdef TIGHT
162:
163: /*
164: * XXX - Space saving .div & .rem routines (small & non-negative numbres only)
165: */
166: .align 4
167: .global .div, .udiv
168: ! int n = 0; while (a >= b) { a -= b; n++; }; return n;
169: .div:
170: .udiv:
171: cmp %o0, %o1
172: bl 2f
173: mov 0, %o5
174: 1:
175: sub %o0, %o1, %o0
176: cmp %o0, %o1
177: bge 1b
178: add %o5, 1, %o5
179: 2:
180: retl
181: mov %o5, %o0
182:
183: .align 4
184: .global .rem, .urem
185: ! while (a>=b) a -= b; return a;
186: .rem:
187: .urem:
188: cmp %o0, %o1
189: bl 2f
190: nop
191: sub %o0, %o1, %o0
192: 1:
193: cmp %o0, %o1
194: bge,a 1b
195: sub %o0, %o1, %o0
196: 2:
197: retl
198: nop
199:
200: #endif /* TIGHT */