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1.1 root 1: /*
2: * Copyright (c) 1980,1986 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: /* "@(#)hpboot.c 7.2 (Berkeley) 8/28/86" */
8: #include <sys/disklabel.h>
9:
10:
11: /*
12: * RP??/RM?? 1st level boot program: loads next 7.5Kbytes from
13: * boot sectors of file system and sets it up to run.
14: * Reads from the controller and drive passed in from the boot
15: * rom.
16: * R1: address of the boot device's adapter
17: * R2: controller number of the boot device
18: * R3: unit number of the boot device
19: * R5: software boot control flags
20: * R6: address of driver subroutine from ROM
21: * SP: base address of usable memory + 0x200
22: */
23: .set BOOTSIZE,15 /* size of boot in sectors */
24: .set RELOC,0x70000
25: /* MBA registers */
26: .set M_cr,4 /* MBA control reg */
27: .set M_sr,8 /* MBA status reg */
28: .set M_var,12 /* MBA virt addr reg */
29: .set M_bc,16 /* MBA byte count reg */
30: .set M_map,0x800 /* start of MBA map reg's */
31: .set MBAinit,1 /* MBA init bit in MBA control reg */
32: .set MBABUSY,0x80000000 /* MBA SR: data transfer busy */
33: .set pMBABUSY,31 /* bit position of MBABUSY */
34: /* Drive information */
35: .set RP,0x400 /* start of drive registers */
36: .set RPDR,0x80 /* offset per drive unit */
37: .set RP_cr,0 /* control status register */
38: .set RP_sr,4 /* drive status reg */
39: .set RP_stk,0x14 /* desired track/sector reg */
40: .set RP_dt,0x18 /* drive type reg */
41: .set RP_off,0x24 /* RP offset reg */
42: .set RP_cyl,0x28 /* desired cyl reg */
43: .set RPBPSECT,512 /* bytes per sector */
44: /* RP?? function codes, status bits */
45: .set RP_GO,1 /* go */
46: .set RP_RED,070 /* read */
47: .set RP_DC,010 /* drive clear */
48: .set RP_RIP,020 /* read in preset */
49: .set RP_FMT,0x1000 /* format 22 */
50: .set RP_MOL,0x1000 /* medium on line */
51: .set RP_DRY,0200 /* drive ready */
52: .set RP_ERR,040000 /* composite error */
53: .set RP_pDRY,7 /* bit position of RP_DRY */
54: .set RP_pERR,14 /* bit position of RP_ERR */
55:
56: init:
57: .word 0 /* entry mask for DEC monitor */
58: nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
59: nop;nop;
60: start:
61: clrl r10 /* major("/dev/hp0a") */
62: extzv $13,$2,r1,r4 /* get MBA number from R1 */
63: insv r4,$24,$8,r10 /* set MBA number */
64: insv r3,$16,$8,r10 /* drive number */
65: extzv $12,$4,r5,r4 /* get partition from r5 */
66: bicw2 $0xf000,r5 /* remove from r5 */
67: insv r4,$8,$4,r10 /* set partition */
68: movl r5,r11
69: movl r1,r9 /* save adaptor address */
70: movl r3,r8 /* and unit number */
71: brw start0
72:
73: /*
74: * Leave space for pack label.
75: */
76: pad:
77: .space LABELOFFSET - (pad - init)
78: packlabel:
79: .space d_end_
80:
81: start0:
82: movl $RELOC,sp
83: moval init,r6
84: movc3 $end,(r6),(sp)
85: jmp *$RELOC+start1
86: /* running relocated */
87: start1:
88: movl $MBAinit,M_cr(r9)
89: /* read-in-preset the drive and set format */
90: mull2 $RPDR,r8
91: movab RP(r9)[r8],r8
92: movl $RP_RIP+RP_GO,RP_cr(r8)
93: movl $RP_FMT,RP_off(r8)
94:
95: .set PROGSIZE,(BOOTSIZE*RPBPSECT)
96: start2:
97: movl $0,RP_cyl(r8)
98: movl $1,RP_stk(r8)
99: movl $-PROGSIZE,M_bc(r9)
100: /* set up MASSBUS map for DMA */
101: clrl r0
102: 1:
103: bisl3 $0x80000000,r0,M_map(r9)[r0]
104: aobleq $BOOTSIZE,r0,1b
105: clrl M_var(r9)
106: movl $RP_RED+RP_GO,RP_cr(r8)
107: rprdy:
108: movl RP_sr(r8),r0
109: bbc $RP_pDRY,r0,rprdy
110: bbs $RP_pERR,r0,rperr
111: rprdy2:
112: bbs $pMBABUSY,M_sr(r9),rprdy2
113:
114: /* Eagles are too fast for the controller. Slow the thing down. */
115: /* (May not be needed with wait for mba above.) */
116: clrl r3
117: buzz: acbl $2000,$1,r3,buzz
118: bicpsw $2
119: jbr clear
120: rperr:
121: halt
122: /* clear core and execute program */
123: clear:
124: movl $PROGSIZE,r3
125: clrcor:
126: clrq (r3)
127: acbl $RELOC,$8,r3,clrcor
128: /* run loaded program */
129: calls $0,*$0
130: brw start2
131:
132: end:
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