projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 05e3da35 KB |
1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Computer Consoles Inc. | |
| 7 | * | |
| 8 | * %sccs.include.proprietary.c% | |
| 9 | * | |
| 10 | * @(#)machdep.c 1.6 (Berkeley) %G% | |
| 11 | */ | |
| bca8fd8b | 12 | |
| b28b3a13 KB |
13 | #include "../tahoe/mem.h" |
| 14 | #include "../include/mtpr.h" | |
| 15 | #include "../tahoe/SYS.h" | |
| bca8fd8b | 16 | |
| a05e383f | 17 | .set _scb, 0x0 |
| bca8fd8b SL |
18 | .set HIGH, 0x1f # mask for total disable |
| 19 | .set BERVEC, 0x80 # offset into scb of the bus error vector | |
| 20 | .set RESTVEC, 0x8 # offset into scb of the restart vector | |
| 21 | ||
| 22 | ENTRY(mtpr, 0) | |
| 23 | mtpr 8(fp),4(fp) | |
| 24 | ret | |
| 25 | ||
| 26 | ENTRY(mfpr, 0) | |
| 27 | mfpr 4(fp),r0 | |
| 28 | ret | |
| 29 | ||
| 30 | ENTRY(bcopy, R2|R1|R0) | |
| 31 | movl 4(fp),r0 | |
| 32 | movl 8(fp),r1 | |
| 33 | movl 12(fp),r2 | |
| 34 | movblk | |
| 35 | ret | |
| 36 | ||
| 37 | /* | |
| 38 | * badaddr(addr, len) | |
| 39 | * see if access addr with a len type instruction causes a machine check | |
| 40 | * len is length of access (1=byte, 2=short, 4=long) | |
| 41 | * r0 = 0 means good(exists); r0 =1 means does not exist. | |
| 42 | */ | |
| 43 | ENTRY(badaddr, R5|R4|R3|R2|R1) | |
| 44 | mfpr $IPL,r1 | |
| 45 | mtpr $HIGH,$IPL | |
| 46 | mfpr $SCBB,r5 | |
| 47 | mtpr $0,$SCBB | |
| 48 | movl *$BERVEC,r2 | |
| 49 | movl 4(fp),r3 | |
| 50 | movl 8(fp),r4 | |
| 51 | movab 9f,*$BERVEC | |
| 52 | bbc $0,r4,1f; tstb (r3) | |
| 53 | 1: bbc $1,r4,1f; tstw (r3) | |
| 54 | 1: bbc $2,r4,1f; tstl (r3) | |
| 55 | 1: clrl r0 # made it w/o machine checks | |
| 73861197 KB |
56 | 2: movl r2,*$BERVEC |
| 57 | mtpr r1,$IPL | |
| 58 | mtpr r5,$SCBB | |
| 59 | ret | |
| 60 | ||
| 61 | /* | |
| 62 | * wbadaddr(addr, len, value) | |
| 63 | * see if write of value to addr with a len type instruction causes | |
| 64 | * a machine check | |
| 65 | * len is length of access (1=byte, 2=short, 4=long) | |
| 66 | * r0 = 0 means good(exists); r0 =1 means does not exist. | |
| 67 | */ | |
| 68 | ENTRY(wbadaddr, R5|R4|R3|R2|R1) | |
| 69 | mfpr $IPL,r1 | |
| 70 | mtpr $HIGH,$IPL | |
| 71 | mfpr $SCBB,r5 | |
| 72 | mtpr $0,$SCBB | |
| 73 | movl *$BERVEC,r2 | |
| 74 | movl 4(fp),r3 | |
| 75 | movl 8(fp),r4 | |
| 76 | movab 9f,*$BERVEC | |
| 77 | bbc $0,r4,1f; movb 15(fp), (r3) | |
| 78 | 1: bbc $1,r4,1f; movw 14(fp), (r3) | |
| 79 | 1: bbc $2,r4,1f; movl 12(fp), (r3) | |
| 80 | 1: clrl r0 # made it w/o machine checks | |
| bca8fd8b SL |
81 | 2: movl r2,*$BERVEC |
| 82 | mtpr r1,$IPL | |
| 83 | mtpr r5,$SCBB | |
| 84 | ret | |
| 85 | ||
| 86 | .align 2 | |
| 87 | 9: # Here we catch buss error (if it comes) | |
| 88 | andl3 4(sp),$ERRCD,r0 | |
| 89 | cmpl r0,$APE | |
| 90 | jneq 1f | |
| 91 | halt # Address parity error !!! | |
| 92 | 1: cmpl r0,$VBE | |
| 93 | jneq 1f | |
| 94 | halt # Versabus error | |
| 95 | 1: | |
| 96 | movl $1,r0 # Anything else = bad address | |
| 97 | movab 8(sp),sp # discard buss error trash | |
| 98 | movab 2b,(sp) # new program counter on stack. | |
| 99 | rei | |
| 100 | ||
| 101 | ENTRY(movow, 0) | |
| 102 | movow 10(fp),*4(fp) | |
| 103 | ret | |
| 104 | ||
| 105 | ENTRY(movob, 0) | |
| a05e383f | 106 | movob 11(fp),*4(fp) |
| bca8fd8b | 107 | ret |