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934e4ecf | 1 | /* init_main.c 4.2 %G% */ |
c4708522 BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/dir.h" | |
6 | #include "../h/user.h" | |
7 | #include "../h/filsys.h" | |
8 | #include "../h/mount.h" | |
9 | #include "../h/map.h" | |
10 | #include "../h/proc.h" | |
11 | #include "../h/inode.h" | |
12 | #include "../h/seg.h" | |
13 | #include "../h/conf.h" | |
14 | #include "../h/buf.h" | |
15 | #include "../h/mtpr.h" | |
16 | #include "../h/pte.h" | |
17 | #include "../h/clock.h" | |
18 | #include "../h/vm.h" | |
19 | #include "../h/cmap.h" | |
831e498e | 20 | #include "../h/text.h" |
00ea40c7 | 21 | #include "../h/vlimit.h" |
c4708522 BJ |
22 | |
23 | /* | |
24 | * Initialization code. | |
25 | * Called from cold start routine as | |
26 | * soon as a stack and segmentation | |
27 | * have been established. | |
28 | * Functions: | |
29 | * clear and free user core | |
30 | * turn on clock | |
31 | * hand craft 0th process | |
32 | * call all initialization routines | |
33 | * fork - process 0 to schedule | |
34 | * - process 2 to page out | |
35 | * - process 1 execute bootstrap | |
36 | * | |
37 | * loop at loc 13 (0xd) in user mode -- /etc/init | |
38 | * cannot be executed. | |
39 | */ | |
40 | main(firstaddr) | |
41 | { | |
73248996 | 42 | register int i; |
c4708522 BJ |
43 | |
44 | cpusid = mfpr(SID); /* get system identification */ | |
45 | #ifdef FASTVAX | |
46 | rqinit(); | |
47 | #endif | |
48 | startup(firstaddr); | |
49 | if (lotsfree == 0) | |
50 | lotsfree = LOTSFREE; | |
51 | ||
52 | /* | |
53 | * set up system process 0 (swapper) | |
54 | */ | |
55 | ||
56 | proc[0].p_p0br = (struct pte *)mfpr(P0BR); | |
57 | proc[0].p_szpt = 1; | |
58 | proc[0].p_addr = uaddr(&proc[0]); | |
59 | proc[0].p_stat = SRUN; | |
60 | proc[0].p_flag |= SLOAD|SSYS; | |
61 | proc[0].p_nice = NZERO; | |
62 | u.u_procp = &proc[0]; | |
63 | u.u_cmask = CMASK; | |
73248996 | 64 | for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) |
403556fe BJ |
65 | switch (i) { |
66 | ||
67 | case LIM_STACK: | |
68 | u.u_limit[i] = 512*1024; | |
69 | continue; | |
70 | case LIM_DATA: | |
71 | u.u_limit[i] = ctob(MAXDSIZ); | |
72 | continue; | |
73 | default: | |
74 | u.u_limit[i] = INFINITY; | |
75 | continue; | |
76 | } | |
c4708522 BJ |
77 | clkstart(); |
78 | ||
79 | /* | |
80 | * Initialize devices and | |
81 | * set up 'known' i-nodes | |
82 | */ | |
83 | ||
84 | ihinit(); | |
0d5a507c | 85 | bhinit(); |
c4708522 BJ |
86 | cinit(); |
87 | binit(); | |
88 | bswinit(); | |
89 | iinit(); | |
90 | rootdir = iget(rootdev, (ino_t)ROOTINO); | |
91 | rootdir->i_flag &= ~ILOCK; | |
92 | u.u_cdir = iget(rootdev, (ino_t)ROOTINO); | |
93 | u.u_cdir->i_flag &= ~ILOCK; | |
94 | u.u_rdir = NULL; | |
95 | u.u_dmap = zdmap; | |
96 | u.u_smap = zdmap; | |
97 | ||
98 | /* | |
99 | * make page-out daemon (process 2) | |
100 | * the daemon has ctopt(NSWBUF*CLSIZE*KLMAX) pages of page | |
101 | * table so that it can map dirty pages into | |
102 | * its address space during asychronous pushes. | |
103 | */ | |
104 | ||
105 | mpid = 1; | |
106 | proc[0].p_szpt = clrnd(ctopt(NSWBUF*CLSIZE*KLMAX + UPAGES)); | |
107 | proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ | |
108 | if (newproc(0)) { | |
109 | proc[2].p_flag |= SLOAD|SSYS; | |
110 | proc[2].p_dsize = u.u_dsize = NSWBUF*CLSIZE*KLMAX; | |
111 | pageout(); | |
112 | } | |
113 | ||
114 | /* | |
115 | * make init process and | |
116 | * enter scheduling loop | |
117 | */ | |
118 | ||
119 | mpid = 0; | |
120 | proc[1].p_stat = 0; | |
121 | proc[0].p_szpt = CLSIZE; | |
122 | if (newproc(0)) { | |
123 | expand(clrnd((int)btoc(szicode)), P0BR); | |
934e4ecf | 124 | (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); |
81263dba | 125 | (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); |
c4708522 BJ |
126 | /* |
127 | * Return goes to loc. 0 of user init | |
128 | * code just copied out. | |
129 | */ | |
130 | return; | |
131 | } | |
132 | proc[0].p_szpt = 1; | |
133 | sched(); | |
134 | } | |
135 | ||
136 | /* | |
137 | * iinit is called once (from main) | |
138 | * very early in initialization. | |
139 | * It reads the root's super block | |
140 | * and initializes the current date | |
141 | * from the last modified date. | |
142 | * | |
143 | * panic: iinit -- cannot read the super | |
144 | * block. Usually because of an IO error. | |
145 | */ | |
146 | iinit() | |
147 | { | |
148 | register struct buf *cp, *bp; | |
149 | register struct filsys *fp; | |
c4708522 BJ |
150 | |
151 | (*bdevsw[major(rootdev)].d_open)(rootdev, 1); | |
152 | bp = bread(rootdev, SUPERB); | |
153 | cp = geteblk(); | |
154 | if(u.u_error) | |
155 | panic("iinit"); | |
156 | bcopy(bp->b_un.b_addr, cp->b_un.b_addr, sizeof(struct filsys)); | |
157 | brelse(bp); | |
158 | mount[0].m_bufp = cp; | |
159 | mount[0].m_dev = rootdev; | |
160 | fp = cp->b_un.b_filsys; | |
161 | fp->s_flock = 0; | |
162 | fp->s_ilock = 0; | |
163 | fp->s_ronly = 0; | |
164 | fp->s_lasti = 1; | |
165 | fp->s_nbehind = 0; | |
403556fe | 166 | clkinit(fp->s_time); |
c4708522 BJ |
167 | bootime = time; |
168 | } | |
169 | ||
170 | /* | |
171 | * This is the set of buffers proper, whose heads | |
172 | * were declared in buf.h. There can exist buffer | |
173 | * headers not pointing here that are used purely | |
174 | * as arguments to the I/O routines to describe | |
175 | * I/O to be done-- e.g. swap headers swbuf[] for | |
176 | * swapping. | |
a53ab6ba BJ |
177 | * |
178 | * These are actually allocated kernel map slots and space is | |
179 | * allocated in locore.s for them. | |
c4708522 | 180 | */ |
143f81a8 | 181 | char buffers[NBUF][BSIZE]; |
c4708522 BJ |
182 | |
183 | /* | |
184 | * Initialize the buffer I/O system by freeing | |
185 | * all buffers and setting all device buffer lists to empty. | |
c4708522 BJ |
186 | */ |
187 | binit() | |
188 | { | |
189 | register struct buf *bp; | |
190 | register struct buf *dp; | |
191 | register int i; | |
192 | struct bdevsw *bdp; | |
41888f16 | 193 | struct swdevt *swp; |
c4708522 BJ |
194 | |
195 | bfreelist.b_forw = bfreelist.b_back = | |
196 | bfreelist.av_forw = bfreelist.av_back = &bfreelist; | |
197 | for (i=0; i<NBUF; i++) { | |
198 | bp = &buf[i]; | |
199 | bp->b_dev = NODEV; | |
200 | bp->b_un.b_addr = buffers[i]; | |
201 | bp->b_back = &bfreelist; | |
202 | bp->b_forw = bfreelist.b_forw; | |
203 | bfreelist.b_forw->b_back = bp; | |
204 | bfreelist.b_forw = bp; | |
205 | bp->b_flags = B_BUSY; | |
206 | brelse(bp); | |
207 | } | |
208 | for (bdp = bdevsw; bdp->d_open; bdp++) { | |
209 | dp = bdp->d_tab; | |
210 | if(dp) { | |
211 | dp->b_forw = dp; | |
212 | dp->b_back = dp; | |
213 | } | |
214 | nblkdev++; | |
215 | } | |
41888f16 BJ |
216 | /* |
217 | * Count swap devices, and adjust total swap space available. | |
218 | * Some of this space will not be available until a vswapon() | |
219 | * system is issued, usually when the system goes multi-user. | |
220 | */ | |
221 | nswdev = 0; | |
222 | for (swp = swdevt; swp->sw_dev; swp++) | |
223 | nswdev++; | |
224 | if (nswdev == 0) | |
225 | panic("binit"); | |
226 | nswap *= nswdev; | |
227 | maxpgio *= nswdev; | |
228 | swfree(0); | |
c4708522 BJ |
229 | } |
230 | ||
231 | /* | |
232 | * Initialize linked list of free swap | |
233 | * headers. These do not actually point | |
234 | * to buffers, but rather to pages that | |
235 | * are being swapped in and out. | |
236 | */ | |
237 | bswinit() | |
238 | { | |
239 | register int i; | |
240 | ||
241 | bswlist.av_forw = &swbuf[0]; | |
242 | for (i=0; i<NSWBUF-1; i++) | |
243 | swbuf[i].av_forw = &swbuf[i+1]; | |
244 | swbuf[NSWBUF-1].av_forw = NULL; | |
245 | } |