projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1394f032 | 1 | /* |
| 96f1050d | 2 | * Copyright 2004-2009 Analog Devices Inc. |
| 1394f032 | 3 | * |
| de450838 | 4 | * Licensed under the Clear BSD license or the GPL-2 (or later) |
| 1394f032 BW |
5 | */ |
| 6 | ||
| 7 | #include <linux/linkage.h> | |
| 8 | ||
| 9 | .align 2 | |
| 10 | ||
| 11 | #ifdef CONFIG_MEMSET_L1 | |
| 12 | .section .l1.text | |
| 13 | #else | |
| 14 | .text | |
| 15 | #endif | |
| 16 | ||
| 17 | /* | |
| 18 | * C Library function MEMSET | |
| 19 | * R0 = address (leave unchanged to form result) | |
| 20 | * R1 = filler byte | |
| 21 | * R2 = count | |
| 22 | * Favours word aligned data. | |
| 648eee52 | 23 | * The strncpy assumes that I0 and I1 are not used in this function |
| 1394f032 BW |
24 | */ |
| 25 | ||
| 26 | ENTRY(_memset) | |
| 27 | P0 = R0 ; /* P0 = address */ | |
| 28 | P2 = R2 ; /* P2 = count */ | |
| 29 | R3 = R0 + R2; /* end */ | |
| 30 | CC = R2 <= 7(IU); | |
| 31 | IF CC JUMP .Ltoo_small; | |
| 32 | R1 = R1.B (Z); /* R1 = fill char */ | |
| 33 | R2 = 3; | |
| 34 | R2 = R0 & R2; /* addr bottom two bits */ | |
| 35 | CC = R2 == 0; /* AZ set if zero. */ | |
| 36 | IF !CC JUMP .Lforce_align ; /* Jump if addr not aligned. */ | |
| 37 | ||
| 38 | .Laligned: | |
| 39 | P1 = P2 >> 2; /* count = n/4 */ | |
| 40 | R2 = R1 << 8; /* create quad filler */ | |
| 41 | R2.L = R2.L + R1.L(NS); | |
| 42 | R2.H = R2.L + R1.H(NS); | |
| 43 | P2 = R3; | |
| 44 | ||
| 45 | LSETUP (.Lquad_loop , .Lquad_loop) LC0=P1; | |
| 46 | .Lquad_loop: | |
| 47 | [P0++] = R2; | |
| 48 | ||
| 49 | CC = P0 == P2; | |
| 50 | IF !CC JUMP .Lbytes_left; | |
| 51 | RTS; | |
| 52 | ||
| 53 | .Lbytes_left: | |
| 54 | R2 = R3; /* end point */ | |
| 55 | R3 = P0; /* current position */ | |
| 56 | R2 = R2 - R3; /* bytes left */ | |
| 57 | P2 = R2; | |
| 58 | ||
| 59 | .Ltoo_small: | |
| 60 | CC = P2 == 0; /* Check zero count */ | |
| 61 | IF CC JUMP .Lfinished; /* Unusual */ | |
| 62 | ||
| 63 | .Lbytes: | |
| 64 | LSETUP (.Lbyte_loop , .Lbyte_loop) LC0=P2; | |
| 65 | .Lbyte_loop: | |
| 66 | B[P0++] = R1; | |
| 67 | ||
| 68 | .Lfinished: | |
| 69 | RTS; | |
| 70 | ||
| 71 | .Lforce_align: | |
| 72 | CC = BITTST (R0, 0); /* odd byte */ | |
| 73 | R0 = 4; | |
| 74 | R0 = R0 - R2; | |
| 75 | P1 = R0; | |
| 76 | R0 = P0; /* Recover return address */ | |
| 77 | IF !CC JUMP .Lskip1; | |
| 78 | B[P0++] = R1; | |
| 79 | .Lskip1: | |
| 80 | CC = R2 <= 2; /* 2 bytes */ | |
| 81 | P2 -= P1; /* reduce count */ | |
| 82 | IF !CC JUMP .Laligned; | |
| 83 | B[P0++] = R1; | |
| 84 | B[P0++] = R1; | |
| 85 | JUMP .Laligned; | |
| 86 | ||
| 51be24c3 | 87 | ENDPROC(_memset) |