Commit | Line | Data |
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0a34b6fd | 1 | /* init_main.c 4.10 %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" |
0a34b6fd | 22 | #include "../h/clist.h" |
c4708522 BJ |
23 | |
24 | /* | |
25 | * Initialization code. | |
26 | * Called from cold start routine as | |
27 | * soon as a stack and segmentation | |
28 | * have been established. | |
29 | * Functions: | |
30 | * clear and free user core | |
31 | * turn on clock | |
32 | * hand craft 0th process | |
33 | * call all initialization routines | |
34 | * fork - process 0 to schedule | |
35 | * - process 2 to page out | |
36 | * - process 1 execute bootstrap | |
37 | * | |
38 | * loop at loc 13 (0xd) in user mode -- /etc/init | |
39 | * cannot be executed. | |
40 | */ | |
41 | main(firstaddr) | |
42 | { | |
73248996 | 43 | register int i; |
dd4b582c | 44 | register struct proc *p; |
c4708522 | 45 | |
c4708522 | 46 | rqinit(); |
c4708522 BJ |
47 | startup(firstaddr); |
48 | if (lotsfree == 0) | |
49 | lotsfree = LOTSFREE; | |
50 | ||
51 | /* | |
52 | * set up system process 0 (swapper) | |
53 | */ | |
dd4b582c BJ |
54 | p = &proc[0]; |
55 | p->p_p0br = (struct pte *)mfpr(P0BR); | |
56 | p->p_szpt = 1; | |
57 | p->p_addr = uaddr(p); | |
58 | p->p_stat = SRUN; | |
59 | p->p_flag |= SLOAD|SSYS; | |
60 | p->p_nice = NZERO; | |
61 | setredzone(p->p_addr, (caddr_t)&u); | |
62 | u.u_procp = p; | |
c4708522 | 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) | |
c34926db | 100 | * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page |
c4708522 BJ |
101 | * table so that it can map dirty pages into |
102 | * its address space during asychronous pushes. | |
103 | */ | |
104 | ||
105 | mpid = 1; | |
c34926db | 106 | proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); |
c4708522 BJ |
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; | |
c34926db | 110 | proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; |
c4708522 BJ |
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 | { | |
5b564702 | 148 | register struct buf *bp; |
c4708522 | 149 | register struct filsys *fp; |
c4708522 BJ |
150 | |
151 | (*bdevsw[major(rootdev)].d_open)(rootdev, 1); | |
152 | bp = bread(rootdev, SUPERB); | |
c4708522 BJ |
153 | if(u.u_error) |
154 | panic("iinit"); | |
63e97a1d | 155 | bp->b_flags |= B_LOCKED; /* block can never be re-used */ |
c4708522 | 156 | brelse(bp); |
c4708522 | 157 | mount[0].m_dev = rootdev; |
63e97a1d BJ |
158 | mount[0].m_bufp = bp; |
159 | fp = bp->b_un.b_filsys; | |
c4708522 BJ |
160 | fp->s_flock = 0; |
161 | fp->s_ilock = 0; | |
162 | fp->s_ronly = 0; | |
163 | fp->s_lasti = 1; | |
164 | fp->s_nbehind = 0; | |
403556fe | 165 | clkinit(fp->s_time); |
c4708522 BJ |
166 | bootime = time; |
167 | } | |
168 | ||
c4708522 BJ |
169 | /* |
170 | * Initialize the buffer I/O system by freeing | |
171 | * all buffers and setting all device buffer lists to empty. | |
c4708522 BJ |
172 | */ |
173 | binit() | |
174 | { | |
175 | register struct buf *bp; | |
176 | register struct buf *dp; | |
177 | register int i; | |
178 | struct bdevsw *bdp; | |
41888f16 | 179 | struct swdevt *swp; |
c4708522 | 180 | |
63e97a1d BJ |
181 | for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { |
182 | dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; | |
183 | dp->b_flags = B_HEAD; | |
184 | } | |
185 | dp--; /* dp = &bfreelist[BQUEUES-1]; */ | |
0a34b6fd | 186 | for (i=0; i<nbuf; i++) { |
c4708522 BJ |
187 | bp = &buf[i]; |
188 | bp->b_dev = NODEV; | |
0a34b6fd | 189 | bp->b_un.b_addr = buffers + i * BSIZE; |
63e97a1d BJ |
190 | bp->b_back = dp; |
191 | bp->b_forw = dp->b_forw; | |
192 | dp->b_forw->b_back = bp; | |
193 | dp->b_forw = bp; | |
194 | bp->b_flags = B_BUSY|B_INVAL; | |
c4708522 BJ |
195 | brelse(bp); |
196 | } | |
5b564702 | 197 | for (bdp = bdevsw; bdp->d_open; bdp++) |
c4708522 | 198 | nblkdev++; |
41888f16 BJ |
199 | /* |
200 | * Count swap devices, and adjust total swap space available. | |
201 | * Some of this space will not be available until a vswapon() | |
202 | * system is issued, usually when the system goes multi-user. | |
203 | */ | |
204 | nswdev = 0; | |
205 | for (swp = swdevt; swp->sw_dev; swp++) | |
206 | nswdev++; | |
207 | if (nswdev == 0) | |
208 | panic("binit"); | |
209 | nswap *= nswdev; | |
210 | maxpgio *= nswdev; | |
211 | swfree(0); | |
c4708522 BJ |
212 | } |
213 | ||
214 | /* | |
215 | * Initialize linked list of free swap | |
216 | * headers. These do not actually point | |
217 | * to buffers, but rather to pages that | |
218 | * are being swapped in and out. | |
219 | */ | |
220 | bswinit() | |
221 | { | |
222 | register int i; | |
0a34b6fd | 223 | register struct buf *sp = swbuf; |
c4708522 | 224 | |
c34926db | 225 | bswlist.av_forw = sp; |
0a34b6fd | 226 | for (i=0; i<nswbuf-1; i++, sp++) |
c34926db BJ |
227 | sp->av_forw = sp+1; |
228 | sp->av_forw = NULL; | |
c4708522 | 229 | } |
e7c7d88e BJ |
230 | |
231 | /* | |
232 | * Initialize clist by freeing all character blocks, then count | |
233 | * number of character devices. (Once-only routine) | |
234 | */ | |
235 | cinit() | |
236 | { | |
237 | register int ccp; | |
238 | register struct cblock *cp; | |
239 | register struct cdevsw *cdp; | |
240 | ||
241 | ccp = (int)cfree; | |
242 | ccp = (ccp+CROUND) & ~CROUND; | |
243 | for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { | |
244 | cp->c_next = cfreelist; | |
245 | cfreelist = cp; | |
246 | cfreecount += CBSIZE; | |
247 | } | |
248 | ccp = 0; | |
249 | for(cdp = cdevsw; cdp->d_open; cdp++) | |
250 | ccp++; | |
251 | nchrdev = ccp; | |
252 | } |