1 | /* |
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2 | * memset.c - architecture independent memory set function |
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3 | * |
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4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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6 | * |
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7 | * This file is part of ALMOS-kernel. |
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8 | * |
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9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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10 | * under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; version 2.0 of the License. |
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12 | * |
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13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |
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23 | #include <string.h> |
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24 | |
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25 | /* TODO: introduce the possiblity to use architecture specific |
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26 | * more optimized version if any */ |
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27 | |
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28 | void do_memset_8(void *dst, uint32_t val, size_t size) |
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29 | { |
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30 | volatile uint32_t *dst_ptr; |
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31 | register uint32_t *limit_ptr; |
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32 | |
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33 | dst_ptr = dst; |
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34 | limit_ptr = (uint32_t*)((uint8_t*)dst + (size << 5)); |
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35 | |
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36 | while(dst_ptr != limit_ptr) |
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37 | { |
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38 | dst_ptr[0] = val; |
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39 | dst_ptr[1] = val; |
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40 | dst_ptr[2] = val; |
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41 | dst_ptr[3] = val; |
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42 | dst_ptr[4] = val; |
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43 | dst_ptr[5] = val; |
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44 | dst_ptr[6] = val; |
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45 | dst_ptr[7] = val; |
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46 | |
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47 | dst_ptr += 8; |
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48 | } |
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49 | } |
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50 | |
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51 | #include <kdmsg.h> |
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52 | #include <cpu.h> |
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53 | void *memset(void *s, int c, unsigned int size) |
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54 | { |
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55 | register uint8_t *ptr = s; |
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56 | register uint32_t *wptr; |
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57 | register uint32_t val; |
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58 | register uint32_t isize; |
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59 | register uint32_t count; |
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60 | |
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61 | c&=0xFF; |
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62 | ptr = s; |
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63 | |
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64 | while(((uint32_t) ptr & 0x3) && size && size--) |
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65 | *(ptr++) = (uint8_t) c; |
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66 | |
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67 | if(size == 0) return s; |
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68 | |
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69 | val = c << 24 | c << 16 | c << 8 | (c & 0xFF); |
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70 | isize = size >> 5; |
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71 | |
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72 | if(isize != 0) |
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73 | do_memset_8(ptr, val, isize); |
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74 | |
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75 | count = isize << 5; |
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76 | size -= count; |
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77 | |
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78 | if(size == 0) return s; |
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79 | |
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80 | wptr = (uint32_t*)(ptr + count); |
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81 | isize = size >> 2; |
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82 | count = isize; |
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83 | |
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84 | while(isize--) |
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85 | *(wptr++) = val; |
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86 | |
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87 | size = size - (count << 2); |
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88 | ptr = (uint8_t*)wptr; |
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89 | |
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90 | while(size--) |
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91 | *(ptr++) = (uint8_t)c; |
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92 | |
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93 | return s; |
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94 | } |
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