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2215 | kebrt | 1 | /* |
2263 | kebrt | 2 | * Copyright (c) 2007 Michal Kebrt, Petr Stepan |
2215 | kebrt | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup arm32 |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #include <interrupt.h> |
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36 | #include <ipc/irq.h> |
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37 | #include <console/chardev.h> |
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38 | #include <arch/drivers/gxemul.h> |
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39 | #include <console/console.h> |
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40 | #include <sysinfo/sysinfo.h> |
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41 | #include <print.h> |
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2245 | stepan | 42 | #include <ddi/device.h> |
2263 | kebrt | 43 | #include <mm/page.h> |
2274 | kebrt | 44 | #include <arch/machine.h> |
2215 | kebrt | 45 | |
46 | /** Address of devices. */ |
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2263 | kebrt | 47 | #define GXEMUL_VIDEORAM 0x10000000 |
48 | #define GXEMUL_KBD 0x10000000 |
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49 | #define GXEMUL_RTC 0x15000000 |
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50 | #define GXEMUL_RTC_FREQ_OFFSET 0x100 |
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51 | #define GXEMUL_RTC_ACK_OFFSET 0x110 |
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52 | #define GXEMUL_IRQC 0x16000000 |
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53 | #define GXEMUL_IRQC_MASK_OFFSET 0x4 |
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54 | #define GXEMUL_IRQC_UNMASK_OFFSET 0x8 |
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55 | #define GXEMUL_MP 0x11000000 |
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56 | #define GXEMUL_MP_MEMSIZE_OFFSET 0x0090 |
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2215 | kebrt | 57 | |
2263 | kebrt | 58 | |
2245 | stepan | 59 | /** IRQs */ |
60 | #define GXEMUL_KBD_IRQ 2 |
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61 | #define GXEMUL_TIMER_IRQ 4 |
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62 | |||
2263 | kebrt | 63 | static gxemul_hw_map_t gxemul_hw_map; |
2215 | kebrt | 64 | static chardev_t console; |
65 | static irq_t gxemul_irq; |
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2245 | stepan | 66 | static irq_t gxemul_timer_irq; |
2215 | kebrt | 67 | |
2290 | kebrt | 68 | static bool hw_map_init_called = false; |
69 | |||
2215 | kebrt | 70 | static void gxemul_write(chardev_t *dev, const char ch); |
71 | static void gxemul_enable(chardev_t *dev); |
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72 | static void gxemul_disable(chardev_t *dev); |
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73 | static char gxemul_do_read(chardev_t *dev); |
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74 | |||
75 | static chardev_operations_t gxemul_ops = { |
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76 | .resume = gxemul_enable, |
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77 | .suspend = gxemul_disable, |
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78 | .write = gxemul_write, |
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79 | .read = gxemul_do_read, |
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80 | }; |
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81 | |||
2263 | kebrt | 82 | |
83 | /** Initializes #gxemul_hw_map. */ |
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2284 | stepan | 84 | void gxemul_hw_map_init(void) |
2263 | kebrt | 85 | { |
86 | gxemul_hw_map.videoram = hw_map(GXEMUL_VIDEORAM, PAGE_SIZE); |
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87 | gxemul_hw_map.kbd = hw_map(GXEMUL_KBD, PAGE_SIZE); |
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88 | gxemul_hw_map.rtc = hw_map(GXEMUL_RTC, PAGE_SIZE); |
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89 | gxemul_hw_map.irqc = hw_map(GXEMUL_IRQC, PAGE_SIZE); |
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90 | |||
91 | gxemul_hw_map.rtc_freq = gxemul_hw_map.rtc + GXEMUL_RTC_FREQ_OFFSET; |
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92 | gxemul_hw_map.rtc_ack = gxemul_hw_map.rtc + GXEMUL_RTC_ACK_OFFSET; |
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93 | gxemul_hw_map.irqc_mask = gxemul_hw_map.irqc + GXEMUL_IRQC_MASK_OFFSET; |
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94 | gxemul_hw_map.irqc_unmask = gxemul_hw_map.irqc + GXEMUL_IRQC_UNMASK_OFFSET; |
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2264 | kebrt | 95 | |
2290 | kebrt | 96 | hw_map_init_called = true; |
2263 | kebrt | 97 | } |
98 | |||
2215 | kebrt | 99 | /** Putchar that works with gxemul */ |
100 | void gxemul_write(chardev_t *dev, const char ch) |
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101 | { |
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2263 | kebrt | 102 | *((char *) gxemul_hw_map.videoram) = ch; |
2215 | kebrt | 103 | } |
104 | |||
105 | /* Called from getc(). */ |
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106 | void gxemul_enable(chardev_t *dev) |
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107 | { |
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108 | // cp0_unmask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 109 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 110 | } |
111 | |||
112 | /* Called from getc(). */ |
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113 | void gxemul_disable(chardev_t *dev) |
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114 | { |
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115 | // cp0_mask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 116 | gxemul_irqc_mask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 117 | } |
118 | |||
119 | /** Read character using polling, assume interrupts disabled */ |
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120 | static char gxemul_do_read(chardev_t *dev) |
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121 | { |
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122 | char ch; |
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123 | |||
124 | while (1) { |
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2263 | kebrt | 125 | ch = *((volatile char *) gxemul_hw_map.kbd); |
2215 | kebrt | 126 | if (ch) { |
127 | if (ch == '\r') |
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128 | return '\n'; |
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129 | if (ch == 0x7f) |
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130 | return '\b'; |
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131 | return ch; |
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132 | } |
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133 | } |
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134 | } |
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135 | |||
136 | /** Process keyboard interrupt. */ |
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137 | static void gxemul_irq_handler(irq_t *irq, void *arg, ...) |
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138 | { |
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139 | if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox)) |
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140 | ipc_irq_send_notif(irq); |
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141 | else { |
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142 | char ch = 0; |
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143 | |||
2263 | kebrt | 144 | ch = *((char *) gxemul_hw_map.kbd); |
2215 | kebrt | 145 | if (ch =='\r') |
146 | ch = '\n'; |
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147 | if (ch == 0x7f) |
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148 | ch = '\b'; |
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2284 | stepan | 149 | chardev_push_character(&console, ch); |
2215 | kebrt | 150 | } |
151 | } |
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152 | |||
153 | static irq_ownership_t gxemul_claim(void) |
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154 | { |
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155 | return IRQ_ACCEPT; |
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156 | } |
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157 | |||
2274 | kebrt | 158 | void machine_grab_console(void) |
2215 | kebrt | 159 | { |
160 | ipl_t ipl = interrupts_disable(); |
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2263 | kebrt | 161 | spinlock_lock(&gxemul_irq.lock); |
2215 | kebrt | 162 | gxemul_irq.notif_cfg.notify = false; |
163 | spinlock_unlock(&gxemul_irq.lock); |
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164 | interrupts_restore(ipl); |
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165 | } |
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166 | |||
2274 | kebrt | 167 | void machine_release_console(void) |
2215 | kebrt | 168 | { |
169 | ipl_t ipl = interrupts_disable(); |
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170 | spinlock_lock(&gxemul_irq.lock); |
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171 | if (gxemul_irq.notif_cfg.answerbox) |
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172 | gxemul_irq.notif_cfg.notify = true; |
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173 | spinlock_unlock(&gxemul_irq.lock); |
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174 | interrupts_restore(ipl); |
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175 | } |
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176 | |||
177 | |||
2263 | kebrt | 178 | /** Return console object representing gxemul console */ |
2274 | kebrt | 179 | void machine_console_init(devno_t devno) |
2215 | kebrt | 180 | { |
2263 | kebrt | 181 | chardev_initialize("gxemul_console", &console, &gxemul_ops); |
2215 | kebrt | 182 | stdin = &console; |
183 | stdout = &console; |
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184 | |||
185 | irq_initialize(&gxemul_irq); |
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186 | gxemul_irq.devno = devno; |
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187 | gxemul_irq.inr = GXEMUL_KBD_IRQ; |
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188 | gxemul_irq.claim = gxemul_claim; |
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189 | gxemul_irq.handler = gxemul_irq_handler; |
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190 | irq_register(&gxemul_irq); |
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191 | |||
192 | // cp0_unmask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 193 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 194 | |
195 | sysinfo_set_item_val("kbd", NULL, true); |
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196 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
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197 | sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ); |
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2263 | kebrt | 198 | sysinfo_set_item_val("kbd.address.virtual", NULL, gxemul_hw_map.kbd); |
2215 | kebrt | 199 | } |
200 | |||
2245 | stepan | 201 | /** Return the mask of active interrupts. */ |
202 | inline uint32_t gxemul_irqc_get_sources(void) |
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203 | { |
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2263 | kebrt | 204 | return *(uint32_t*) gxemul_hw_map.irqc; |
2245 | stepan | 205 | } |
206 | |||
207 | /** Masks interrupt. |
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208 | * |
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209 | * @param irq interrupt number |
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210 | */ |
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211 | inline void gxemul_irqc_mask(uint32_t irq) |
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212 | { |
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2263 | kebrt | 213 | *(uint32_t*) gxemul_hw_map.irqc_mask = irq; |
2245 | stepan | 214 | } |
215 | |||
216 | /** Unmasks interrupt. |
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217 | * |
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218 | * @param irq interrupt number |
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219 | */ |
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220 | inline void gxemul_irqc_unmask(uint32_t irq) |
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221 | { |
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2263 | kebrt | 222 | *(uint32_t*) gxemul_hw_map.irqc_unmask = irq; |
2245 | stepan | 223 | } |
224 | |||
225 | |||
226 | /** Starts gxemul Real Time Clock device, which asserts regular interrupts. |
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227 | * |
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228 | * @param frequency interrupts frequency (0 disables RTC) |
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229 | */ |
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230 | void gxemul_timer_start(uint32_t frequency) |
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231 | { |
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2263 | kebrt | 232 | *(uint32_t*) gxemul_hw_map.rtc_freq = frequency; |
2245 | stepan | 233 | } |
234 | |||
235 | static irq_ownership_t gxemul_timer_claim(void) |
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236 | { |
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237 | return IRQ_ACCEPT; |
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238 | } |
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239 | |||
240 | static void gxemul_timer_irq_handler(irq_t *irq, void *arg, ...) |
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241 | { |
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242 | /* TODO time drifts ?? |
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243 | unsigned long drift; |
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244 | |||
245 | drift = cp0_count_read() - nextcount; |
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246 | while (drift > cp0_compare_value) { |
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247 | drift -= cp0_compare_value; |
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248 | CPU->missed_clock_ticks++; |
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249 | } |
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250 | nextcount = cp0_count_read() + cp0_compare_value - drift; |
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251 | cp0_compare_write(nextcount); |
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252 | */ |
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253 | |||
254 | /* |
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255 | * We are holding a lock which prevents preemption. |
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256 | * Release the lock, call clock() and reacquire the lock again. |
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257 | */ |
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258 | spinlock_unlock(&irq->lock); |
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2286 | stepan | 259 | clock(); |
2245 | stepan | 260 | spinlock_lock(&irq->lock); |
2261 | stepan | 261 | |
262 | /* acknowledge tick */ |
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2263 | kebrt | 263 | *(uint32_t*) gxemul_hw_map.rtc_ack = 0; |
2245 | stepan | 264 | |
265 | /* TODO what's that? * |
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266 | if (virtual_timer_fnc != NULL) |
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267 | virtual_timer_fnc(); |
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268 | */ |
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269 | } |
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270 | |||
271 | /** |
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272 | * Initializes and registers timer interrupt handler. |
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273 | */ |
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274 | void gxemul_timer_irq_init() |
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275 | { |
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276 | irq_initialize(&gxemul_timer_irq); |
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277 | gxemul_timer_irq.devno = device_assign_devno(); |
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278 | gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ; |
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279 | gxemul_timer_irq.claim = gxemul_timer_claim; |
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280 | gxemul_timer_irq.handler = gxemul_timer_irq_handler; |
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2261 | stepan | 281 | |
2245 | stepan | 282 | irq_register(&gxemul_timer_irq); |
283 | } |
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284 | |||
2274 | kebrt | 285 | void machine_timer_irq_start() |
2263 | kebrt | 286 | { |
2274 | kebrt | 287 | gxemul_timer_irq_init(); |
288 | gxemul_timer_start(GXEMUL_TIMER_FREQ); |
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289 | } |
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290 | |||
291 | size_t machine_get_memory_size(void) |
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292 | { |
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2263 | kebrt | 293 | return *((int*)(GXEMUL_MP + GXEMUL_MP_MEMSIZE_OFFSET)); |
294 | } |
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2245 | stepan | 295 | |
2290 | kebrt | 296 | void machine_debug_putc(char ch) { |
297 | if (!hw_map_init_called) { |
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298 | *((volatile char *) GXEMUL_KBD) = ch; |
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299 | } else { |
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300 | *((char *) gxemul_hw_map.videoram) = ch; |
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301 | } |
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2264 | kebrt | 302 | } |
303 | |||
2215 | kebrt | 304 | /** @} |
305 | */ |