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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: *
36: * @(#)srt0.c 5.3 (Berkeley) 4/28/91
37: */
38:
39: /*
40: * Startup code for standalone system
41: * Non-relocating version -- for programs which are loaded by boot
42: * Relocating version for boot
43: * Small relocating version for "micro" boot
44: */
45:
46: .globl _end
47: .globl _edata
48: .globl _main
49: .globl __rtt
50: .globl _exit
51: .globl _bootdev
52: .globl _cyloffset
53:
54: #ifdef SMALL
55: /* where the disklabel goes if we have one */
56: .globl _disklabel
57: _disklabel:
58: .space 512
59: #endif
60:
61: entry: .globl entry
62: .globl start
63:
64: #if defined(REL) && !defined(SMALL)
65:
66: /* relocate program and enter at symbol "start" */
67:
68: #movl $entry-RELOC,%esi # from beginning of ram
69: movl $0,%esi
70: #movl $entry,%edi # to relocated area
71: movl $ RELOC,%edi # to relocated area
72: # movl $_edata-RELOC,%ecx # this much
73: movl $64*1024,%ecx
74: cld
75: rep
76: movsb
77: # relocate program counter to relocation base
78: pushl $start
79: ret
80: #endif
81:
82: start:
83:
84: /* setup stack pointer */
85:
86: #ifdef REL
87: leal 4(%esp),%eax /* ignore old pc */
88: movl $ RELOC-4*4,%esp
89: /* copy down boot parameters */
90: movl %esp,%ebx
91: pushl $3*4
92: pushl %ebx
93: pushl %eax
94: call _bcopy
95: movl %ebx,%esp
96: #else
97: /* save old stack state */
98: movl %esp,savearea
99: movl %ebp,savearea+4
100: movl $ RELOC-0x2400,%esp
101: #endif
102:
103: /* clear memory as needed */
104:
105: movl %esp,%esi
106: #ifdef REL
107:
108: /*
109: * Clear Bss and up to 64K heap
110: */
111: movl $64*1024,%ebx
112: movl $_end,%eax # should be movl $_end-_edata but ...
113: subl $_edata,%eax
114: addl %ebx,%eax
115: pushl %eax
116: pushl $_edata
117: call _bzero
118:
119: /*
120: * Clear 64K of stack
121: */
122: movl %esi,%eax
123: subl %ebx,%eax
124: subl $5*4,%ebx
125: pushl %ebx
126: pushl %eax
127: call _bzero
128: #else
129: movl $_edata,%edx
130: movl %esp,%eax
131: subl %edx,%eax
132: pushl %edx
133: pushl %esp
134: call _bzero
135: #endif
136: movl %esi,%esp
137:
138: pushl $0
139: popf
140:
141: #ifndef SMALL
142: call _kbdreset /* resets keyboard and gatea20 brain damage */
143: #endif
144:
145: call _main
146: jmp 1f
147:
148: .data
149: _bootdev: .long 0
150: _cyloffset: .long 0
151: savearea: .long 0,0 # sp & bp to return to
152: .text
153: #ifndef SMALL
154: .globl _getchar
155: #endif
156: .globl _wait
157:
158: __rtt:
159: #ifndef SMALL
160: call _getchar
161: #else
162: _exit:
163: pushl $1000000
164: call _wait
165: popl %eax
166: #endif
167: movl $-7,%eax
168: jmp 1f
169: #ifndef SMALL
170: _exit:
171: call _getchar
172: #endif
173: movl 4(%esp),%eax
174: 1:
175: #ifdef REL
176: #ifndef SMALL
177: call _reset_cpu
178: #endif
179: movw $0x1234,%ax
180: movw %ax,0x472 # warm boot
181: movl $0,%esp # segment violation
182: ret
183: #else
184: movl savearea,%esp
185: movl savearea+4,%ebp
186: ret
187: #endif
188:
189: .globl _inb
190: _inb: movl 4(%esp),%edx
191: subl %eax,%eax # clr eax
192: inb %dx,%al
193: ret
194:
195: .globl _outb
196: _outb: movl 4(%esp),%edx
197: movl 8(%esp),%eax
198: outb %al,%dx
199: ret
200:
201: .globl ___udivsi3
202: ___udivsi3:
203: movl 4(%esp),%eax
204: xorl %edx,%edx
205: divl 8(%esp)
206: ret
207:
208: .globl ___divsi3
209: ___divsi3:
210: movl 4(%esp),%eax
211: xorl %edx,%edx
212: cltd
213: idivl 8(%esp)
214: ret
215:
216: #
217: # bzero (base,cnt)
218: #
219:
220: .globl _bzero
221: _bzero:
222: pushl %edi
223: movl 8(%esp),%edi
224: movl 12(%esp),%ecx
225: movb $0x00,%al
226: cld
227: rep
228: stosb
229: popl %edi
230: ret
231:
232: #
233: # bcopy (src,dst,cnt)
234: # NOTE: does not (yet) handle overlapped copies
235: #
236:
237: .globl _bcopy
238: _bcopy:
239: pushl %esi
240: pushl %edi
241: movl 12(%esp),%esi
242: movl 16(%esp),%edi
243: movl 20(%esp),%ecx
244: cld
245: rep
246: movsb
247: popl %edi
248: popl %esi
249: ret
250:
251: # insw(port,addr,cnt)
252: .globl _insw
253: _insw:
254: pushl %edi
255: movw 8(%esp),%dx
256: movl 12(%esp),%edi
257: movl 16(%esp),%ecx
258: cld
259: nop
260: .byte 0x66,0xf2,0x6d # rep insw
261: nop
262: movl %edi,%eax
263: popl %edi
264: ret
265:
266: # outsw(port,addr,cnt)
267: .globl _outsw
268: _outsw:
269: pushl %esi
270: movw 8(%esp),%dx
271: movl 12(%esp),%esi
272: movl 16(%esp),%ecx
273: cld
274: nop
275: .byte 0x66,0xf2,0x6f # rep outsw
276: nop
277: movl %esi,%eax
278: popl %esi
279: ret
280:
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