1
2
3
4#include <linux/linkage.h>
5
6 .text
7ENTRY(memset)
8 move $r5, $r0 ! Return value
9 beqz $r2, end_memset ! Exit when len = 0
10 srli $p1, $r2, 2 ! $p1 is how many words to copy
11 andi $r2, $r2, 3 ! How many bytes are less than a word
12 beqz $p1, byte_set ! When n is less than a word
13
14 ! set $r1 from ??????ab to abababab
15 andi $r1, $r1,
16 slli $p0, $r1,
17 or $r1, $r1, $p0 ! $r1 = 0000abab
18 slli $p0, $r1,
19 or $r1, $r1, $p0 ! $r1 = abababab
20word_set:
21 addi $p1, $p1,
22 smw.bim $r1, [$r0], $r1 ! Copy the word to det
23 bnez $p1, word_set ! Still words to set, continue looping
24 beqz $r2, end_memset ! No left byte to set
25byte_set: ! Less than 4 bytes left to set
26 addi $r2, $r2,
27 sbi.bi $r1, [$r0],
28 bnez $r2, byte_set ! Still bytes left to set
29end_memset:
30 move $r0, $r5
31 ret
32
33ENDPROC(memset)
34