4 .global flushcache @ beginning_addr, end_addr, flags
11 .global block_or @ void *src, size_t n, int pat
15 orr r2, r2, r2, lsl #8
16 orr r2, r2, r2, lsl #16
25 stmia r0!, {r3-r5,r12}
31 .global block_andor @ void *src, size_t n, int andpat, int orpat
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
51 stmia r0!, {r4-r6,r12}
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
65 ldrb r3, [r1] @ get bit 0 pixels
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
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
83 @ can this be avoided?
84 mov r4, r4, lsl #3 @ *8
97 mov r5, r5, lsl #3 @ *8