1 | /* |
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2 | * ioc_ata.c - ATA driver implementation |
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3 | * |
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4 | * Copyright (c) 2017 Maxime Villard |
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5 | * |
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6 | * This file is part of ALMOS-MKH. |
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7 | * |
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8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; version 2.0 of the License. |
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11 | * |
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12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |
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22 | #include <chdev.h> |
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23 | #include <dev_ioc.h> |
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24 | #include <hal_drivers.h> |
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25 | #include <hal_kentry.h> |
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26 | #include <thread.h> |
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27 | #include <spinlock.h> |
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28 | |
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29 | #include <hal_internal.h> |
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30 | |
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31 | #define PIO_ATA_CBR_BASE 0x1F0 |
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32 | # define ATA_DATA 0x000 |
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33 | # define ATA_ERRFEAT 0x001 /* two regs */ |
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34 | # define ATA_SCR 0x002 |
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35 | # define ATA_SNR 0x003 /* lba0 */ |
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36 | # define ATA_CLR 0x004 /* lba1 */ |
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37 | # define ATA_CHR 0x005 /* lba2 */ |
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38 | # define ATA_DHR 0x006 /* drive | lba3 */ |
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39 | # define ATA_SR 0x007 |
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40 | # define ATA_SR_ERR 0x01 |
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41 | # define ATA_SR_IDX 0x02 |
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42 | # define ATA_SR_CORR 0x04 |
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43 | # define ATA_SR_DRQ 0x08 |
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44 | # define ATA_SR_DSC 0x10 |
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45 | # define ATA_SR_DF 0x20 |
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46 | # define ATA_SR_DRDY 0x40 |
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47 | # define ATA_SR_BSY 0x80 |
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48 | # define ATA_CR 0x007 /* two regs */ |
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49 | |
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50 | #define ATA_CMD_READ_SECTORS_RETRY 0x20 |
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51 | #define ATA_CMD_READ_SECTORS_NORETRY 0x21 |
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52 | #define ATA_CMD_WRITE_SECTORS_RETRY 0x30 |
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53 | #define ATA_CMD_WRITE_SECTORS_NORETRY 0x31 |
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54 | #define ATA_CMD_IDENTIFY 0xEC |
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55 | |
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56 | static inline uint16_t ata_data_read() |
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57 | { |
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58 | return in16(PIO_ATA_CBR_BASE + ATA_DATA); |
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59 | } |
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60 | |
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61 | static inline void ata_data_write(uint16_t val) |
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62 | { |
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63 | out16(PIO_ATA_CBR_BASE + ATA_DATA, val); |
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64 | } |
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65 | |
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66 | static inline uint8_t ata_cbr_read(uint32_t reg) |
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67 | { |
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68 | return in8(PIO_ATA_CBR_BASE + reg); |
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69 | } |
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70 | |
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71 | static inline void ata_cbr_write(uint32_t reg, uint8_t val) |
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72 | { |
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73 | out8(PIO_ATA_CBR_BASE + reg, val); |
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74 | } |
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75 | |
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76 | static inline int ata_wait() |
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77 | { |
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78 | uint8_t status; |
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79 | |
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80 | while (1) { |
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81 | status = ata_cbr_read(ATA_SR); |
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82 | if (status & ATA_SR_DRQ) |
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83 | break; |
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84 | } |
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85 | |
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86 | return ((status & ATA_SR_ERR) ? -1 : 0); |
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87 | } |
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88 | |
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89 | static void ata_prepare(uint8_t slave, uint32_t lba, uint8_t count) |
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90 | { |
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91 | ata_cbr_write(ATA_ERRFEAT, 0x00); /* NULL byte to port 0x1F1 */ |
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92 | ata_cbr_write(ATA_SCR, count); /* sector count */ |
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93 | |
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94 | /* set the lba */ |
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95 | ata_cbr_write(ATA_SNR, (lba >> 0) & 0xFF); |
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96 | ata_cbr_write(ATA_CLR, (lba >> 8) & 0xFF); |
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97 | ata_cbr_write(ATA_CHR, (lba >> 16)& 0xFF); |
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98 | |
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99 | /* set the drive and lba3 */ |
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100 | ata_cbr_write(ATA_DHR, 0xE0 | (slave << 4) | ((lba >> 24) & 0x0F)); |
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101 | } |
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102 | |
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103 | static int ata_read(uint8_t count, char *buf) |
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104 | { |
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105 | uint16_t tmpword; |
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106 | size_t idx, n; |
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107 | |
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108 | for (n = 0; n < count; n++) { |
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109 | /* wait for the drive to signal that it's ready */ |
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110 | if (ata_wait() == -1) |
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111 | x86_panic("ata_wait"); |
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112 | |
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113 | /* read one block */ |
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114 | for (idx = 0; idx < 256; idx++) { |
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115 | tmpword = ata_data_read(); |
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116 | buf[n * 512 + idx * 2] = (uint8_t)(tmpword & 0xFF); |
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117 | buf[n * 512 + idx * 2 + 1] = (uint8_t)(tmpword >> 8); |
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118 | } |
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119 | } |
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120 | |
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121 | return 0; |
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122 | } |
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123 | |
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124 | static int ata_write(uint8_t count, char *buf) |
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125 | { |
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126 | uint16_t tmpword; |
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127 | size_t idx, n; |
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128 | |
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129 | for (n = 0; n < count; n++) { |
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130 | /* wait for the drive to signal that it's ready */ |
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131 | if (ata_wait() == -1) |
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132 | x86_panic("ata_wait"); |
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133 | |
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134 | /* write one block */ |
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135 | for (idx = 0; idx < 256; idx++) { |
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136 | tmpword = (buf[n * 512 + idx * 2 + 1] << 8) | |
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137 | buf[n * 512 + idx * 2]; |
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138 | ata_data_write(tmpword); |
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139 | } |
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140 | } |
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141 | |
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142 | return 0; |
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143 | } |
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144 | |
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145 | static uint16_t bswap16(uint16_t x) |
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146 | { |
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147 | return ((x << 8) & 0xFF00) | ((x >> 8) & 0x00FF); |
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148 | } |
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149 | |
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150 | static void ata_init() |
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151 | { |
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152 | uint8_t data[512]; |
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153 | uint16_t tmpw, *p; |
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154 | size_t idx; |
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155 | char *model; |
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156 | int ret; |
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157 | |
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158 | ata_prepare(0, 0, 0); |
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159 | ata_cbr_write(ATA_CR, ATA_CMD_IDENTIFY); |
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160 | |
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161 | /* wait for the drive to signal that it's ready */ |
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162 | ret = ata_wait(); |
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163 | if (ret == -1) |
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164 | x86_panic("-> unable to identify ATA\n"); |
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165 | |
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166 | /* |
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167 | * Read the first sector, swap it, and print the disk model. |
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168 | */ |
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169 | for (idx = 0; idx < 256; idx++) { |
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170 | tmpw = ata_data_read(); |
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171 | data[idx * 2] = (uint8_t)((tmpw >> 0) & 0xFF); |
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172 | data[idx * 2 + 1] = (uint8_t)((tmpw >> 8) & 0xFF); |
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173 | } |
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174 | for (idx = 27*2; idx < 46*2; idx += 2) { |
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175 | p = (uint16_t *)(&data[idx]); |
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176 | *p = bswap16(*p); |
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177 | } |
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178 | model = (char *)&data[27*2]; |
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179 | data[46*2] = '\0'; |
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180 | x86_printf("-> ATA model: '%s'\n", model); |
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181 | } |
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182 | |
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183 | /* -------------------------------------------------------------------------- */ |
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184 | |
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185 | static void ioc_ata_cmd(xptr_t th_xp); |
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186 | extern void x86_ioapic_ata0(); |
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187 | |
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188 | void ioc_ata_init(chdev_t *chdev) |
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189 | { |
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190 | chdev->cmd = &ioc_ata_cmd; |
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191 | chdev->isr = &x86_ioapic_ata0; |
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192 | ata_init(); |
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193 | } |
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194 | |
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195 | static void ioc_ata_cmd(xptr_t th_xp) |
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196 | { |
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197 | uint32_t cmd_type; // IOC_READ / IOC_WRITE / IOC_SYNC_READ |
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198 | uint32_t lba; // command argument |
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199 | uint32_t count; // command argument |
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200 | xptr_t buf_xp; // command argument |
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201 | |
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202 | // get client thread cluster and local pointer |
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203 | cxy_t th_cxy = GET_CXY( th_xp ); |
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204 | thread_t * th_ptr = (thread_t *)GET_PTR( th_xp ); |
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205 | |
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206 | // get command arguments and extended pointer on IOC device |
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207 | cmd_type = hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.type ) ); |
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208 | lba = hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.lba ) ); |
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209 | count = hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.count ) ); |
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210 | buf_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->ioc_cmd.buf_xp ) ); |
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211 | |
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212 | /* execute operation */ |
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213 | ata_prepare(0, lba, count); |
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214 | if (cmd_type == IOC_WRITE) { |
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215 | ata_cbr_write(ATA_CR, ATA_CMD_WRITE_SECTORS_RETRY); |
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216 | } else { |
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217 | ata_cbr_write(ATA_CR, ATA_CMD_READ_SECTORS_RETRY); |
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218 | } |
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219 | |
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220 | /* waiting policy depends on the command type */ |
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221 | if (cmd_type == IOC_SYNC_READ) { |
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222 | ata_read(count, (char *)buf_xp); |
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223 | } else { |
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224 | x86_panic("!IOC_SYNC_READ not supported"); |
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225 | } |
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226 | } |
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227 | |
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228 | void ioc_ata_isr(hal_cpu_context_t *ctx) |
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229 | { |
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230 | x86_printf("rip = %Z\n", ctx->tf_rip); |
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231 | |
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232 | x86_panic((char *)__func__); |
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233 | } |
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234 | |
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