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1.1 root 1: #include "sys/param.h"
2: #include "sys/systm.h"
3: #include "sys/user.h"
4: #include "sys/filsys.h"
5: #include "sys/mtpr.h"
6: #include "sys/pte.h"
7: #include "sys/proc.h"
8: #include "sys/inode.h"
9: #include "sys/conf.h"
10: #include "sys/buf.h"
11: #include "sys/clock.h"
12: #include "sys/vm.h"
13: #include "sys/text.h"
14: #include "sys/vlimit.h"
15: #include "sys/file.h"
16:
17: /*
18: * Initialization code.
19: * Called from cold start routine as
20: * soon as a stack and segmentation
21: * have been established.
22: * Functions:
23: * clear and free user core
24: * turn on clock
25: * hand craft 0th process
26: * call all initialization routines
27: * fork - process 0 to schedule
28: * - process 2 to page out
29: * - process 1 execute bootstrap
30: *
31: * loop at low addr in user mode -- /etc/init
32: * cannot be executed.
33: */
34: struct proc *procNPROC;
35: struct text *textNTEXT;
36: struct file *fileNFILE;
37: struct inode *inodeNINODE;
38: time_t bootime; /* should probably go away */
39:
40: main()
41: {
42: register int i;
43: register struct proc *p;
44: extern char sigcode[];
45: extern int szsigcode;
46: extern char icode[];
47: extern int szicode;
48: extern int swbufcnt;
49:
50: rqinit();
51: procNPROC = &proc[SYSPIDS];
52: textNTEXT = &text[textcnt];
53: fileNFILE = &file[filecnt];
54: inodeNINODE = &inode[inodecnt];
55: startup();
56:
57: /*
58: * set up system process 0 (swapper)
59: */
60: p = &proc[SWAPPID];
61: p->p_stat = SRUN;
62: p->p_flag |= SLOAD|SSYS;
63: p->p_nice = NZERO;
64: u.u_procp = p;
65: bcopy((caddr_t)sigcode, (caddr_t)u.u_pcb.pcb_sigc, szsigcode);
66: u.u_cmask = CMASK;
67: for (i = 0; i < NGROUPS; i++)
68: u.u_groups[i] = NOGROUP; /* null access group for init */
69: for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++)
70: u.u_limit[i] = INFINITY;
71: u.u_limit[LIM_STACK] = ctob(maxssize);
72: u.u_limit[LIM_DATA] = ctob(maxdsize);
73: u.u_limit[LIM_TEXT] = ctob(maxtsize);
74: p->p_maxrss = INFINITY/NBPG;
75: callinit();
76: clkstart();
77:
78: /*
79: * Initialize devices and
80: * set up 'known' i-nodes
81: */
82:
83: ihinit();
84: bhinit();
85: binit();
86: qinit();
87: bswinit();
88: iinit();
89: bootime = time;
90: u.u_dmap = zdmap;
91: u.u_smap = zdmap;
92:
93: /*
94: * Set the scan rate and other parameters of the paging subsystem.
95: */
96: setupclock();
97:
98: /*
99: * make page-out daemon (process 2)
100: * the daemon has ctopt(swbufcnt*CLSIZE*KLMAX) pages of page
101: * table so that it can map dirty pages into
102: * its address space during asychronous pushes.
103: * this stuff should be shoved out to a vm init routine.
104: */
105:
106: p->p_szpt = clrnd(ctopt(swbufcnt*CLSIZE*KLMAX + UPAGES));
107: if (newproc(&proc[PAGEPID], PAGEPID)) {
108: proc[PAGEPID].p_flag |= SLOAD|SSYS;
109: proc[PAGEPID].p_dsize = u.u_dsize = swbufcnt*CLSIZE*KLMAX;
110: pageout();
111: }
112: /*
113: * make init process and
114: * enter scheduling loop
115: */
116: p->p_szpt = CLSIZE;
117: if (newproc(&proc[INITPID], INITPID)) {
118: expand(clrnd((int)btoc(szicode)), P0BR);
119: (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
120: (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode);
121: /*
122: * Return goes to loc. 0 of user init
123: * code just copied out.
124: */
125: return;
126: }
127: p->p_szpt = 1;
128: sched();
129: }
130:
131: /*
132: * iinit is called once (from main)
133: * very early in initialization.
134: * It reads the root's super block
135: * it mounts the root filesystem.
136: * there is a small amount of magic:
137: * an inode is invented to hold the special file
138: * for the root device, so it is known that
139: * a special file in that filesystem is involved;
140: * the filesystem is mounted on the special file,
141: * then patched so that the root is also the mount point.
142: * some of this magic should be removed.
143: *
144: * some filesystem types init the date, again through magic
145: */
146:
147: static struct inode rootspcl;
148:
149: iinit()
150: {
151: register struct inode *ip;
152: extern int rootfstyp;
153:
154: bdevopen(rootdev);
155: if (u.u_error)
156: panic("iinit root");
157: bdevopen(swapdev);
158: if (u.u_error)
159: panic("iinit swap");
160: rootspcl.i_dev = NODEV;
161: rootspcl.i_fstyp = rootfstyp;
162: rootspcl.i_mode = IFBLK;
163: rootspcl.i_un.i_rdev = rootdev;
164: rootspcl.i_count = 1;
165: /* rootspcl.i_un.i_bufp == NULL; does it matter? */
166: if (fstypsw[rootfstyp] == NULL)
167: panic("iinit fstyp");
168: (*fstypsw[rootfstyp]->t_mount)(&rootspcl, &rootspcl, 0, 1, rootfstyp);
169: if (u.u_error)
170: panic("iinit mount");
171: ip = rootspcl.i_mroot;
172: ip->i_mpoint = ip;
173: ip->i_mroot = NULL; /* own mount point, but not mounted on self */
174: rootdir = ip;
175: u.u_cdir = ip;
176: ip->i_count += 2; /* needed? */
177: u.u_rdir = NULL;
178: }
179:
180: /*
181: * open a block device, with no more than dev
182: */
183:
184: bdevopen(dev)
185: dev_t dev;
186: {
187: register unsigned maj;
188:
189: maj = major(dev);
190: if (maj >= nblkdev || bdevsw[maj] == NULL) {
191: u.u_error = ENODEV;
192: return;
193: }
194: (*bdevsw[maj]->d_open)(dev, FREAD|FWRITE);
195: }
196:
197: /*
198: * Initialize the buffer I/O system by freeing
199: * all buffers and setting all device buffer lists to empty.
200: */
201: binit()
202: {
203: register struct buf *bp;
204: register struct buf *dp;
205: register int i;
206:
207: for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) {
208: dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp;
209: dp->b_flags = B_HEAD;
210: }
211: dp--; /* dp = &bfreelist[BQUEUES-1]; */
212: for (i=0; i<nbuf; i++) {
213: bp = &buf[i];
214: bp->b_dev = NODEV;
215: bp->b_un.b_addr = buffers + i * BUFSIZE;
216: bp->b_back = dp;
217: bp->b_forw = dp->b_forw;
218: dp->b_forw->b_back = bp;
219: dp->b_forw = bp;
220: bp->b_flags = B_BUSY|B_INVAL;
221: brelse(bp);
222: }
223: }
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