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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:
1.1.1.2 ! root 61: .globl entry
! 62: .set entry,0
1.1 root 63: .globl start
64:
65: #if defined(REL) && !defined(SMALL)
66:
67: /* relocate program and enter at symbol "start" */
68:
69: #movl $entry-RELOC,%esi # from beginning of ram
70: movl $0,%esi
71: #movl $entry,%edi # to relocated area
72: movl $ RELOC,%edi # to relocated area
73: # movl $_edata-RELOC,%ecx # this much
74: movl $64*1024,%ecx
75: cld
76: rep
77: movsb
78: # relocate program counter to relocation base
79: pushl $start
80: ret
81: #endif
82:
83: start:
84:
85: /* setup stack pointer */
86:
87: #ifdef REL
88: leal 4(%esp),%eax /* ignore old pc */
89: movl $ RELOC-4*4,%esp
90: /* copy down boot parameters */
91: movl %esp,%ebx
92: pushl $3*4
93: pushl %ebx
94: pushl %eax
95: call _bcopy
96: movl %ebx,%esp
97: #else
98: /* save old stack state */
99: movl %esp,savearea
100: movl %ebp,savearea+4
101: movl $ RELOC-0x2400,%esp
102: #endif
103:
104: /* clear memory as needed */
105:
106: movl %esp,%esi
107: #ifdef REL
108:
109: /*
110: * Clear Bss and up to 64K heap
111: */
112: movl $64*1024,%ebx
113: movl $_end,%eax # should be movl $_end-_edata but ...
114: subl $_edata,%eax
115: addl %ebx,%eax
116: pushl %eax
117: pushl $_edata
118: call _bzero
119:
120: /*
121: * Clear 64K of stack
122: */
123: movl %esi,%eax
124: subl %ebx,%eax
125: subl $5*4,%ebx
126: pushl %ebx
127: pushl %eax
128: call _bzero
129: #else
130: movl $_edata,%edx
131: movl %esp,%eax
132: subl %edx,%eax
133: pushl %edx
134: pushl %esp
135: call _bzero
136: #endif
1.1.1.2 ! root 137: /*movl %esi,%esp*/
1.1 root 138:
1.1.1.2 ! root 139: /*pushl $0
! 140: popf*/
1.1 root 141:
142: call _kbdreset /* resets keyboard and gatea20 brain damage */
143:
144: call _main
145: jmp 1f
146:
147: .data
148: _bootdev: .long 0
149: _cyloffset: .long 0
150: savearea: .long 0,0 # sp & bp to return to
151: .text
152: .globl _wait
153:
154: __rtt:
155: pushl $1000000
156: call _wait
157: popl %eax
158: movl $-7,%eax
159: jmp 1f
1.1.1.2 ! root 160:
1.1 root 161: _exit:
1.1.1.2 ! root 162: pushl $1000000
! 163: call _wait
! 164: popl %eax
1.1 root 165: movl 4(%esp),%eax
166: 1:
167: #ifdef REL
168: #ifndef SMALL
169: call _reset_cpu
170: #endif
171: movw $0x1234,%ax
172: movw %ax,0x472 # warm boot
173: movl $0,%esp # segment violation
174: ret
175: #else
176: movl savearea,%esp
177: movl savearea+4,%ebp
178: ret
179: #endif
180:
181: .globl _inb
182: _inb: movl 4(%esp),%edx
183: subl %eax,%eax # clr eax
1.1.1.2 ! root 184: jmp 7f ; nop ; 7: jmp 7f ; nop ; 7: ;
1.1 root 185: inb %dx,%al
1.1.1.2 ! root 186: jmp 7f ; nop ; 7: jmp 7f ; nop ; 7: ;
1.1 root 187: ret
188:
189: .globl _outb
190: _outb: movl 4(%esp),%edx
191: movl 8(%esp),%eax
1.1.1.2 ! root 192: jmp 7f ; nop ; 7: jmp 7f ; nop ; 7: ;
1.1 root 193: outb %al,%dx
1.1.1.2 ! root 194: jmp 7f ; nop ; 7: jmp 7f ; nop ; 7: ;
1.1 root 195: ret
196:
197: .globl ___udivsi3
198: ___udivsi3:
199: movl 4(%esp),%eax
200: xorl %edx,%edx
201: divl 8(%esp)
202: ret
203:
204: .globl ___divsi3
205: ___divsi3:
206: movl 4(%esp),%eax
207: xorl %edx,%edx
208: cltd
209: idivl 8(%esp)
210: ret
211:
212: #
213: # bzero (base,cnt)
214: #
215:
216: .globl _bzero
217: _bzero:
218: pushl %edi
219: movl 8(%esp),%edi
220: movl 12(%esp),%ecx
221: movb $0x00,%al
222: cld
223: rep
224: stosb
225: popl %edi
226: ret
227:
228: #
229: # bcopy (src,dst,cnt)
230: # NOTE: does not (yet) handle overlapped copies
231: #
232:
233: .globl _bcopy
234: _bcopy:
235: pushl %esi
236: pushl %edi
237: movl 12(%esp),%esi
238: movl 16(%esp),%edi
239: movl 20(%esp),%ecx
240: cld
241: rep
242: movsb
243: popl %edi
244: popl %esi
245: ret
246:
247: # insw(port,addr,cnt)
248: .globl _insw
249: _insw:
250: pushl %edi
251: movw 8(%esp),%dx
252: movl 12(%esp),%edi
253: movl 16(%esp),%ecx
254: cld
255: nop
256: .byte 0x66,0xf2,0x6d # rep insw
257: nop
258: movl %edi,%eax
259: popl %edi
260: ret
261:
262: # outsw(port,addr,cnt)
263: .globl _outsw
264: _outsw:
265: pushl %esi
266: movw 8(%esp),%dx
267: movl 12(%esp),%esi
268: movl 16(%esp),%ecx
269: cld
270: nop
271: .byte 0x66,0xf2,0x6f # rep outsw
272: nop
273: movl %esi,%eax
274: popl %esi
275: ret
276:
1.1.1.2 ! root 277: .globl _scream
! 278: _scream: inb $0x61,%al
! 279: orb $3,%al
! 280: outb %al, $0x61
! 281: ret
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