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1 #include <stdio.h> |
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2 |
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3 |
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4 /* size of NVRAM in bytes */ |
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5 #define NVRAM_MAX_SIZE 262144 |
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6 |
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7 /* size of block in byte */ |
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8 #define NVRAM_BLOCK_SIZE 256 |
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9 |
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10 #define NVRAM_FILE_NAME "__nvram__" |
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11 |
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12 FILE *nvram_file = NULL; |
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13 |
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14 |
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15 void iat_flash_read_regs(); |
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16 void iat_flash_write_regs(); |
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17 void iat_flash_write_page(unsigned int); |
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18 void iat_flash_read_page(unsigned int); |
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19 |
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20 |
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21 short data_len; /* 0 to NVRAM_BLOCK_SIZE bytes */ |
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22 short data_num_pages; |
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23 unsigned int *data_page = NULL; |
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24 unsigned int data_addr; |
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25 |
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26 unsigned int *regs_page = NULL; |
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27 |
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28 int iat_init() |
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29 { |
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30 int i; |
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31 |
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32 nvram_file = fopen(NVRAM_FILE_NAME, "wr"); |
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33 if (nvram_file == NULL) |
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34 return -1; |
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35 |
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36 int n = NVRAM_BLOCK_SIZE / sizeof(unsigned int); |
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37 |
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38 /* some actions to initialise the flash */ |
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39 data_len = 0; |
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40 data_num_pages = 0; |
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41 |
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42 data_page = (unsigned int *)malloc(sizeof(unsigned int) * n); |
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43 memset(data_page, 0, sizeof(unsigned int)*n); |
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44 |
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45 if (data_page == NULL) |
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46 return -1; |
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47 |
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48 regs_page = (unsigned int *)malloc(sizeof(unsigned int) * n); |
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49 memset(regs_page, 0, sizeof(unsigned int)*n); |
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50 if (regs_page == NULL) |
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51 return -2; |
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52 |
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53 iat_flash_read_regs(); |
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54 |
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55 /* start the data at the location specified in the registers */ |
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56 if (0) /* for now it is 0, but put here a test to know whether |
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57 or not the NVRAM has been written before */ |
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58 data_addr = regs_page[1]; |
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59 else |
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60 data_addr = NVRAM_BLOCK_SIZE; /* let start at block 1 */ |
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61 |
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62 /* create a file the size of the simulated NVRAM */ |
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63 for(i=0; i<NVRAM_MAX_SIZE/NVRAM_BLOCK_SIZE + 1; i++) |
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64 fwrite(data_page, sizeof(unsigned int), n, nvram_file); |
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65 |
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66 return 0; |
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67 } |
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68 |
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69 |
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70 void iat_end() |
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71 { |
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72 iat_flash_write_page(data_addr); |
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73 |
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74 iat_flash_write_regs(); |
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75 |
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76 fclose(nvram_file); |
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77 } |
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78 |
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79 |
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80 void iat_flash_read_regs() |
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81 { |
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82 fseek(nvram_file, 0, SEEK_SET); |
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83 fread(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file); |
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84 } |
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85 |
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86 |
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87 void iat_flash_write_regs() |
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88 { |
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89 fseek(nvram_file, 0, SEEK_SET); |
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90 fwrite(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file); |
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91 } |
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92 |
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93 |
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94 void iat_flash_read_page(unsigned int addr) |
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95 { |
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96 fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET); |
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97 fread(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file); |
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98 } |
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99 |
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100 |
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101 void iat_flash_write_page(unsigned int addr) |
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102 { |
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103 fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET); |
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104 fwrite(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file); |
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105 } |
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106 |
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107 |
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108 /*------------------------------------------------------*/ |
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109 int main() |
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110 { |
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111 iat_init(); |
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112 iat_end(); |
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113 } |
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114 /*------------------------------------------------------*/ |