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[/] [raptor64/] [trunk/] [software/] [sample code/] [bootrom.s] - Blame information for rev 16

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        org 0xFFFF_FFFF_FFFF_F000
start:
        ori             r1,r0,#5117             ; test data
        sqrt    r4,r1
        sqrt    r4,r1
        ori             r2,r0,#1067
        mulu    r5,r1,r2
        ori             r1,r0,#0xFFFF_FFFF_FFD0_0000
        ori     r2,r0,#0x32
        ori     r3,r0,#1612
j1:
        sc              r2,[r1]
        addi    r1,r1,#2
        subi    r3,r3,#1
        bne             r3,r0,j1
        call    Getkey
        nop
        nop
        nop
        nop
 
Getkey:
        ori             r1,r0,#0xFFFF_FFFF_FFDC_0000
sr1:
        lb              r2,[r1]
        bge             r2,r0,sr1
        lb              r0,1[r1]                ; clear keyboard strobe
        ret
 
;==============================================================================
; Checkerboard RAM tester
;==============================================================================
;
ramtest:
        or              r8,r0,r0                ; r8 = 0
        ori             r1,r0,#0xAAAA5555AAAA5555       ; checkerboard pattern
ramtest2:
        sw              r1,[r8]                 ; save the checkerboard to memory
        lw              r2,[r8]                 ; read it back
        cmp             r3,r1,r2                ; is it the same ?
        bnez    r3,r0,ramtest1
        addi    r8,r8,#8                ; increment RAM pointer
        cmpi    r3,r8,#0x0000_0000_0100_0000
        bltz    r3,r0,ramtest2
ramtest1:
        or              r10,r8,r0               ; r10 = max ram address
        ; readback the checkerboard pattern
        or              r8,r0,r0                ; r8 = 0
ramtest4:
        lw              r2,[r8]
        cmpi    r3,r2,#0xAAAA5555AAAA5555
        bnez    r3,r0,ramtest3
        addi    r8,r8,#8
        cmpi    r3,r8,#0x0000_0000_0100_0000
        bltz    r3,r0,ramtest4
ramtest3:
        bne             r8,r10,ramtest8 ; check for equal maximum address
 
        ; perform ramtest again with inverted checkerboard
        or              r8,r0,r0                ; r8 = 0
        ori             r1,r0,#0x5555AAAA5555AAAA
ramtest5:
        sw              r1,[r8]
        lw              r2,[r8]
        cmp             r3,r1,r2
        bnez    r3,r0,ramtest6
        addi    r8,r8,#8
        cmpi    r3,r8,#0x0000_0000_0100_0000
        bltz    r3,r0,ramtest5
ramtest6:
        or              r11,r8,r0               ; r11 = max ram address
        ; readback checkerboard
        or              r8,r0,r0
ramtest7:
        lw              r2,[r8]
        cmpi    r3,r2,#0x5555AAAA5555AAAA
        bnez    r3,r0,ramtest8
        addi    r8,r8,#8
        cmpi    r3,r8,#0x0000_0000_0100_0000
        bltz    r3,r0,ramtest7
ramtest8:
        beq             r8,r11,ramtest9
        min             r8,r8,r11
ramtest9:
        beq             r8,r10,ramtest10
        min             r8,r8,r10
ramtest10:
        sw              r8,0x00000400   ;memend
 
        org             0xFFFF_FFFF_FFFF_FFC0
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        org             0xFFFF_FFFF_FFFF_FFF0
        jmp             start

Line No.	Rev	Author	Line
1	10	robfinch
2			`org 0xFFFF_FFFF_FFFF_F000`
3			`start:`
4			`ori r1,r0,#5117 ; test data`
5			`sqrt r4,r1`
6			`sqrt r4,r1`
7			`ori r2,r0,#1067`
8			`mulu r5,r1,r2`
9			`ori r1,r0,#0xFFFF_FFFF_FFD0_0000`
10			`ori r2,r0,#0x32`
11			`ori r3,r0,#1612`
12			`j1:`
13			`sc r2,[r1]`
14			`addi r1,r1,#2`
15			`subi r3,r3,#1`
16			`bne r3,r0,j1`
17			`call Getkey`
18			`nop`
19			`nop`
20			`nop`
21			`nop`
22
23			`Getkey:`
24			`ori r1,r0,#0xFFFF_FFFF_FFDC_0000`
25			`sr1:`
26			`lb r2,[r1]`
27			`bge r2,r0,sr1`
28			`lb r0,1[r1] ; clear keyboard strobe`
29			`ret`
30
31			`;==============================================================================`
32			`; Checkerboard RAM tester`
33			`;==============================================================================`
34			`;`
35			`ramtest:`
36			`or r8,r0,r0 ; r8 = 0`
37			`ori r1,r0,#0xAAAA5555AAAA5555 ; checkerboard pattern`
38			`ramtest2:`
39			`sw r1,[r8] ; save the checkerboard to memory`
40			`lw r2,[r8] ; read it back`
41			`cmp r3,r1,r2 ; is it the same ?`
42			`bnez r3,r0,ramtest1`
43			`addi r8,r8,#8 ; increment RAM pointer`
44			`cmpi r3,r8,#0x0000_0000_0100_0000`
45			`bltz r3,r0,ramtest2`
46			`ramtest1:`
47			`or r10,r8,r0 ; r10 = max ram address`
48			`; readback the checkerboard pattern`
49			`or r8,r0,r0 ; r8 = 0`
50			`ramtest4:`
51			`lw r2,[r8]`
52			`cmpi r3,r2,#0xAAAA5555AAAA5555`
53			`bnez r3,r0,ramtest3`
54			`addi r8,r8,#8`
55			`cmpi r3,r8,#0x0000_0000_0100_0000`
56			`bltz r3,r0,ramtest4`
57			`ramtest3:`
58			`bne r8,r10,ramtest8 ; check for equal maximum address`
59
60			`; perform ramtest again with inverted checkerboard`
61			`or r8,r0,r0 ; r8 = 0`
62			`ori r1,r0,#0x5555AAAA5555AAAA`
63			`ramtest5:`
64			`sw r1,[r8]`
65			`lw r2,[r8]`
66			`cmp r3,r1,r2`
67			`bnez r3,r0,ramtest6`
68			`addi r8,r8,#8`
69			`cmpi r3,r8,#0x0000_0000_0100_0000`
70			`bltz r3,r0,ramtest5`
71			`ramtest6:`
72			`or r11,r8,r0 ; r11 = max ram address`
73			`; readback checkerboard`
74			`or r8,r0,r0`
75			`ramtest7:`
76			`lw r2,[r8]`
77			`cmpi r3,r2,#0x5555AAAA5555AAAA`
78			`bnez r3,r0,ramtest8`
79			`addi r8,r8,#8`
80			`cmpi r3,r8,#0x0000_0000_0100_0000`
81			`bltz r3,r0,ramtest7`
82			`ramtest8:`
83			`beq r8,r11,ramtest9`
84			`min r8,r8,r11`
85			`ramtest9:`
86			`beq r8,r10,ramtest10`
87			`min r8,r8,r10`
88			`ramtest10:`
89			`sw r8,0x00000400 ;memend`
90
91			`org 0xFFFF_FFFF_FFFF_FFC0`
92			`nop`
93			`nop`
94			`nop`
95			`nop`
96			`nop`
97			`nop`
98			`nop`
99			`nop`
100			`nop`
101			`org 0xFFFF_FFFF_FFFF_FFF0`
102			`jmp start`

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Subversion Repositories raptor64

[/] [raptor64/] [trunk/] [software/] [sample code/] [bootrom.s] - Blame information for rev 16