937bf65b |
1 | @ vim:filetype=armasm |
2 | |
3 | @ test |
4 | .global flushcache @ beginning_addr, end_addr, flags |
5 | |
6 | flushcache: |
7 | swi #0x9f0002 |
8 | mov pc, lr |
9 | |
c0bf6f9f |
10 | |
6587f346 |
11 | .global block_or @ void *src, size_t n, int pat |
12 | |
13 | block_or: |
14 | stmfd sp!, {r4-r5} |
15 | orr r2, r2, r2, lsl #8 |
16 | orr r2, r2, r2, lsl #16 |
17 | mov r1, r1, lsr #4 |
18 | block_loop_or: |
19 | ldmia r0, {r3-r5,r12} |
20 | subs r1, r1, #1 |
21 | orr r3, r3, r2 |
22 | orr r4, r4, r2 |
23 | orr r5, r5, r2 |
24 | orr r12,r12,r2 |
25 | stmia r0!, {r3-r5,r12} |
26 | bne block_loop_or |
27 | ldmfd sp!, {r4-r5} |
28 | bx lr |
29 | |
30 | |
31 | .global block_andor @ void *src, size_t n, int andpat, int orpat |
32 | |
33 | block_andor: |
34 | stmfd sp!, {r4-r6} |
35 | orr r2, r2, r2, lsl #8 |
36 | orr r2, r2, r2, lsl #16 |
37 | orr r3, r3, r3, lsl #8 |
38 | orr r3, r3, r3, lsl #16 |
39 | mov r1, r1, lsr #4 |
40 | block_loop_andor: |
41 | ldmia r0, {r4-r6,r12} |
42 | subs r1, r1, #1 |
43 | and r4, r4, r2 |
44 | orr r4, r4, r3 |
45 | and r5, r5, r2 |
46 | orr r5, r5, r3 |
47 | and r6, r6, r2 |
48 | orr r6, r6, r3 |
49 | and r12,r12,r2 |
50 | orr r12,r12,r3 |
51 | stmia r0!, {r4-r6,r12} |
52 | bne block_loop_andor |
53 | ldmfd sp!, {r4-r6} |
54 | bx lr |
55 | |
56 | |
57 | |
c0bf6f9f |
58 | /* buggy and slow, probably because function call overhead |
59 | @ renderer helper, based on bitbank's method |
60 | .global draw8pix @ uint8 *P, uint8 *C, uint8 *PALRAM @ dest, src, pal |
61 | |
62 | draw8pix: |
63 | stmfd sp!, {r4,r5} |
64 | |
65 | ldrb r3, [r1] @ get bit 0 pixels |
66 | mov r12,#1 |
67 | orr r12,r12,r12,lsl #8 |
68 | orr r12,r12,r12,lsl #16 |
69 | ldrb r1, [r1, #8] @ get bit 1 pixels |
70 | orr r3, r3, r3, lsl #9 @ shift them over 1 byte + 1 bit |
71 | orr r3, r3, r3, lsl #18 @ now 4 pixels take up 4 bytes |
72 | and r4, r12,r3, lsr #7 @ mask off the upper nibble pixels we want |
73 | and r5, r12,r3, lsr #3 @ mask off the lower nibble pixels we want |
74 | ldr r2, [r2] |
75 | |
76 | orr r1, r1, r1, lsl #9 @ process the bit 1 pixels |
77 | orr r1, r1, r1, lsl #18 |
78 | and r3, r12,r1, lsr #7 @ mask off the upper nibble pixels we want |
79 | and r1, r12,r1, lsr #3 @ mask off the lower nibble |
80 | orr r4, r4, r3, lsl #1 |
81 | orr r5, r5, r1, lsl #5 |
82 | |
83 | @ can this be avoided? |
84 | mov r4, r4, lsl #3 @ *8 |
85 | mov r3, r2, ror r4 |
86 | strb r3, [r0], #1 |
87 | mov r4, r4, lsr #8 |
88 | mov r3, r2, ror r4 |
89 | strb r3, [r0], #1 |
90 | mov r4, r4, lsr #8 |
91 | mov r3, r2, ror r4 |
92 | strb r3, [r0], #1 |
93 | mov r4, r4, lsr #8 |
94 | mov r3, r2, ror r4 |
95 | strb r3, [r0], #1 |
96 | |
97 | mov r5, r5, lsl #3 @ *8 |
98 | mov r3, r2, ror r5 |
99 | strb r3, [r0], #1 |
100 | mov r5, r5, lsr #8 |
101 | mov r3, r2, ror r5 |
102 | strb r3, [r0], #1 |
103 | mov r5, r5, lsr #8 |
104 | mov r3, r2, ror r5 |
105 | strb r3, [r0], #1 |
106 | mov r5, r5, lsr #8 |
107 | mov r3, r2, ror r5 |
108 | strb r3, [r0], #1 |
109 | |
110 | ldmfd sp!, {r4,r5} |
111 | bx lr |
112 | */ |
113 | |