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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * William Jolitz.
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 the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
1.1.1.4 ! root 36: * from: @(#)srt0.c 5.3 (Berkeley) 4/28/91
! 37: * srt0.c,v 1.2 1993/05/22 08:02:23 cgd Exp
1.1 root 38: */
39:
40: /*
41: * Startup code for standalone system
42: * Non-relocating version -- for programs which are loaded by boot
43: * Relocating version for boot
44: * Small relocating version for "micro" boot
45: */
46:
47: .globl _end
48: .globl _edata
49: .globl _main
50: .globl __rtt
51: .globl _exit
52: .globl _bootdev
53: .globl _cyloffset
1.1.1.3 root 54: #define NOP inb $0x84,%al ; inb $0x84,%al
1.1 root 55:
56: #ifdef SMALL
57: /* where the disklabel goes if we have one */
58: .globl _disklabel
59: _disklabel:
60: .space 512
1.1.1.3 root 61: .globl _scsisn
62: .set _scsisn, RELOC+0x60
1.1 root 63: #endif
64:
1.1.1.2 root 65: .globl entry
66: .set entry,0
1.1 root 67: .globl start
68:
69: #if defined(REL) && !defined(SMALL)
70:
71: /* relocate program and enter at symbol "start" */
72:
73: #movl $entry-RELOC,%esi # from beginning of ram
74: movl $0,%esi
75: #movl $entry,%edi # to relocated area
76: movl $ RELOC,%edi # to relocated area
77: # movl $_edata-RELOC,%ecx # this much
78: movl $64*1024,%ecx
79: cld
80: rep
81: movsb
82: # relocate program counter to relocation base
83: pushl $start
84: ret
85: #endif
86:
87: start:
88:
89: /* setup stack pointer */
90:
91: #ifdef REL
92: leal 4(%esp),%eax /* ignore old pc */
1.1.1.3 root 93: movl $ RELOC-3*4,%ebx
94: /* copy boot parameters */
1.1 root 95: pushl $3*4
96: pushl %ebx
97: pushl %eax
98: call _bcopy
99: movl %ebx,%esp
100: #else
101: /* save old stack state */
102: movl %esp,savearea
103: movl %ebp,savearea+4
104: movl $ RELOC-0x2400,%esp
105: #endif
106:
107: /* clear memory as needed */
108:
109: movl %esp,%esi
110: #ifdef REL
111:
112: /*
113: * Clear Bss and up to 64K heap
114: */
115: movl $64*1024,%ebx
116: movl $_end,%eax # should be movl $_end-_edata but ...
117: subl $_edata,%eax
1.1.1.3 root 118: #addl %ebx,%eax
1.1 root 119: pushl %eax
120: pushl $_edata
121: call _bzero
122:
123: /*
124: * Clear 64K of stack
125: */
126: movl %esi,%eax
127: subl %ebx,%eax
128: subl $5*4,%ebx
129: pushl %ebx
130: pushl %eax
131: call _bzero
132: #else
133: movl $_edata,%edx
134: movl %esp,%eax
135: subl %edx,%eax
136: pushl %edx
137: pushl %esp
138: call _bzero
139: #endif
140:
141: call _kbdreset /* resets keyboard and gatea20 brain damage */
1.1.1.3 root 142: movl %esi,%esp
1.1 root 143: call _main
144: jmp 1f
145:
146: .data
147: _bootdev: .long 0
148: _cyloffset: .long 0
149: savearea: .long 0,0 # sp & bp to return to
150: .text
151: .globl _wait
152:
153: __rtt:
154: pushl $1000000
155: call _wait
156: popl %eax
157: movl $-7,%eax
158: jmp 1f
1.1.1.2 root 159:
1.1 root 160: _exit:
1.1.1.2 root 161: pushl $1000000
162: call _wait
163: popl %eax
1.1 root 164: movl 4(%esp),%eax
165: 1:
166: #ifdef REL
167: #ifndef SMALL
168: call _reset_cpu
169: #endif
170: movw $0x1234,%ax
171: movw %ax,0x472 # warm boot
172: movl $0,%esp # segment violation
173: ret
174: #else
175: movl savearea,%esp
176: movl savearea+4,%ebp
177: ret
178: #endif
179:
180: .globl _inb
181: _inb: movl 4(%esp),%edx
182: subl %eax,%eax # clr eax
1.1.1.3 root 183: NOP
1.1 root 184: inb %dx,%al
185: ret
186:
187: .globl _outb
188: _outb: movl 4(%esp),%edx
1.1.1.3 root 189: NOP
1.1 root 190: movl 8(%esp),%eax
191: outb %al,%dx
192: ret
193:
194: .globl ___udivsi3
195: ___udivsi3:
196: movl 4(%esp),%eax
197: xorl %edx,%edx
198: divl 8(%esp)
199: ret
200:
201: .globl ___divsi3
202: ___divsi3:
203: movl 4(%esp),%eax
204: xorl %edx,%edx
205: cltd
206: idivl 8(%esp)
207: ret
208:
209: #
210: # bzero (base,cnt)
211: #
212:
213: .globl _bzero
214: _bzero:
215: pushl %edi
216: movl 8(%esp),%edi
217: movl 12(%esp),%ecx
218: movb $0x00,%al
219: cld
220: rep
221: stosb
222: popl %edi
223: ret
224:
225: #
226: # bcopy (src,dst,cnt)
227: # NOTE: does not (yet) handle overlapped copies
228: #
229:
230: .globl _bcopy
231: _bcopy:
232: pushl %esi
233: pushl %edi
234: movl 12(%esp),%esi
235: movl 16(%esp),%edi
236: movl 20(%esp),%ecx
237: cld
238: rep
239: movsb
240: popl %edi
241: popl %esi
242: ret
243:
244: # insw(port,addr,cnt)
245: .globl _insw
246: _insw:
247: pushl %edi
248: movw 8(%esp),%dx
249: movl 12(%esp),%edi
250: movl 16(%esp),%ecx
1.1.1.3 root 251: NOP
1.1 root 252: cld
253: nop
254: .byte 0x66,0xf2,0x6d # rep insw
255: nop
256: movl %edi,%eax
257: popl %edi
258: ret
259:
260: # outsw(port,addr,cnt)
261: .globl _outsw
262: _outsw:
263: pushl %esi
264: movw 8(%esp),%dx
265: movl 12(%esp),%esi
266: movl 16(%esp),%ecx
1.1.1.3 root 267: NOP
1.1 root 268: cld
269: nop
270: .byte 0x66,0xf2,0x6f # rep outsw
271: nop
272: movl %esi,%eax
273: popl %esi
274: ret
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