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1.1 root 1: /* $Header: /kernel/kersrc/i286/RCS/mmain.c,v 1.1 92/07/17 15:21:33 bin Exp Locker: bin $ */
2: /* (lgl-
3: * The information contained herein is a trade secret of Mark Williams
4: * Company, and is confidential information. It is provided under a
5: * license agreement, and may be copied or disclosed only under the
6: * terms of that agreement. Any reproduction or disclosure of this
7: * material without the express written authorization of Mark Williams
8: * Company or persuant to the license agreement is unlawful.
9: *
10: * COHERENT Version 2.3.37
11: * Copyright (c) 1982, 1983, 1984.
12: * An unpublished work by Mark Williams Company, Chicago.
13: * All rights reserved.
14: -lgl) */
15: /*
16: * 8086/8088 Coherent.
17: * All machines.
18: * Machine dependent stuff.
19: *
20: * $Log: mmain.c,v $
21: * Revision 1.1 92/07/17 15:21:33 bin
22: * Initial revision
23: *
24: * Revision 1.2 91/06/20 14:40:23 bin
25: * update provided by hal
26: *
27: * Revision 1.2 88/08/05 15:43:42 src
28: * Bug: Spawning large number of processes would cause system to crash.
29: * Fix: Kernel alloc space no longer overlaps loadable driver data.
30: *
31: * Revision 1.1 88/03/24 17:39:46 src
32: * Initial revision
33: *
34: * 88/02/24 Allan Cornish /usr/src/sys/i8086/src/mmain.c
35: * corebot is now aligned on a 512 byte boundary.
36: *
37: * 87/11/30 Allan Cornish /usr/src/sys/i8086/src/mmain.c
38: * Check for kernel data space > 64 Kbytes now done AFTER rounding up.
39: *
40: * 87/11/21 Allan Cornish /usr/src/sys/i8086/src/mmain.c
41: * Use of bruc/ctob macros eliminated since no longer valid in protected mode.
42: *
43: * 87/11/14 Allan Cornish /usr/src/sys/i8086/src/mmain.c
44: * Init code+data now split into icodep/icodes and idatap/idatas.
45: *
46: * 87/11/12 Allan Cornish /usr/src/sys/i8086/src/mmain.c
47: * Corebot/coretop now paddr_t rather than saddr_t to support protected mode.
48: *
49: * 87/10/05 Allan Cornish /usr/src/sys/i8086/src/mmain.c
50: * Loadable driver data slot allocation added.
51: *
52: * 87/05/08 Allan Cornish /usr/src/sys/i8086/src/mmain.c
53: * Ctob(sds) is now cast as ctob((paddr_t)sds) to avoid address truncation.
54: *
55: * 86/07/23 Allan Cornish
56: * Added check for kernel data space exceeding 64 Kbytes.
57: */
58: #include <sys/coherent.h>
59: #include <sys/i8086.h>
60: #include <sys/clist.h>
61: #include <errno.h>
62: #include <sys/inode.h>
63: #include <sys/proc.h>
64: #include <sys/seg.h>
65: #include <signal.h>
66: #include <sys/buf.h>
67: #include <sys/typed.h>
68:
69: /* Arguments are passed into the kernel through boot_gift.
70: * If you start getting "Not enough room for all arguments." messages
71: * at boot time, just increase the BG_LEN to whatever you need.
72: * This structure is EXACTLY BG_LEN bytes long.
73: */
74: #define BG_LEN 512
75: TYPED_SPACE(boot_gift, BG_LEN, T_FIFO_SIC);
76:
77: saddr_t uasa; /* Currently active uarea */
78:
79: /*
80: * General initialisation.
81: */
82: i8086()
83: {
84: register unsigned allocp;
85: extern vaddr_t aicodep;
86: extern vaddr_t aicodes;
87: extern vaddr_t aidatap;
88: extern vaddr_t aidatas;
89: extern vaddr_t etext;
90: extern vaddr_t end;
91: auto faddr_t fp;
92: long datsize;
93: unsigned bsize, csize, isize, ssize;
94:
95: /*
96: * Set up memory bases.
97: * Align the buffers modulo BSIZE (512) in the physical space,
98: * so that any machines that have only 16 bit DMA counters will
99: * work out.
100: */
101: datsize = (long)&end;
102: datsize += ALLSIZE;
103: datsize += NBUF * sizeof(BUF);
104: datsize += ssize = NSLOT*(sizeof(int) + slotsz);
105: datsize += isize = NINODE*sizeof(INODE);
106: datsize += csize = NCLIST*sizeof(CLIST);
107: datsize += bsize = NBUF*BSIZE;
108: datsize = (datsize + 511) & ~511;
109: if ( datsize >= 0x10000L )
110: panic("Kernel data exceeds 64 Kbytes");
111:
112: blockp = datsize - bsize - ((sds&0x1F)<<4);
113: clistp = (unsigned)blockp - csize;
114: inodep = (unsigned)clistp - isize;
115: slotp = (unsigned)inodep - ssize;
116: allocp = &end;
117: blockp += (sds << 4L);
118: if ((unsigned)allocp > (unsigned)slotp)
119: panic("No alloc space");
120: corebot = ((sds << 4L) + datsize + 511) & ~511;
121: asize = (unsigned)slotp - allocp;
122: msize = (coretop-holetop+holebot-corebot) / 1024;
123: allkp = setarena(allocp, asize);
124: icodep = (char *)&aicodep;
125: icodes = (int)&aicodes;
126: idatap = (char *)&aidatap;
127: idatas = (int)&aidatas;
128: fp = ptov( corebot, (fsize_t) UPASIZE );
129: uasa = FP_SEL(fp);
130:
131: /* outb(0x65, 0x9e); /* MLK set Planar Control Register */
132: }
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