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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> |
2326 | kebrt | 45 | #include <arch/debug/print.h> |
2215 | kebrt | 46 | |
2340 | kebrt | 47 | |
2355 | stepan | 48 | /** Addresses of devices. */ |
2263 | kebrt | 49 | #define GXEMUL_VIDEORAM 0x10000000 |
50 | #define GXEMUL_KBD 0x10000000 |
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2300 | kebrt | 51 | #define GXEMUL_HALT_OFFSET 0x10 |
2263 | kebrt | 52 | #define GXEMUL_RTC 0x15000000 |
53 | #define GXEMUL_RTC_FREQ_OFFSET 0x100 |
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54 | #define GXEMUL_RTC_ACK_OFFSET 0x110 |
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55 | #define GXEMUL_IRQC 0x16000000 |
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56 | #define GXEMUL_IRQC_MASK_OFFSET 0x4 |
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57 | #define GXEMUL_IRQC_UNMASK_OFFSET 0x8 |
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58 | #define GXEMUL_MP 0x11000000 |
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59 | #define GXEMUL_MP_MEMSIZE_OFFSET 0x0090 |
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2340 | kebrt | 60 | #define GXEMUL_FB 0x12000000 |
2215 | kebrt | 61 | |
2263 | kebrt | 62 | |
2245 | stepan | 63 | /** IRQs */ |
64 | #define GXEMUL_KBD_IRQ 2 |
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65 | #define GXEMUL_TIMER_IRQ 4 |
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66 | |||
2263 | kebrt | 67 | static gxemul_hw_map_t gxemul_hw_map; |
2215 | kebrt | 68 | static chardev_t console; |
69 | static irq_t gxemul_irq; |
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2245 | stepan | 70 | static irq_t gxemul_timer_irq; |
2215 | kebrt | 71 | |
2290 | kebrt | 72 | static bool hw_map_init_called = false; |
73 | |||
2215 | kebrt | 74 | static void gxemul_write(chardev_t *dev, const char ch); |
75 | static void gxemul_enable(chardev_t *dev); |
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76 | static void gxemul_disable(chardev_t *dev); |
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77 | static char gxemul_do_read(chardev_t *dev); |
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78 | |||
79 | static chardev_operations_t gxemul_ops = { |
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80 | .resume = gxemul_enable, |
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81 | .suspend = gxemul_disable, |
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82 | .write = gxemul_write, |
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83 | .read = gxemul_do_read, |
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84 | }; |
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85 | |||
2357 | kebrt | 86 | |
2355 | stepan | 87 | /** Returns the mask of active interrupts. */ |
2340 | kebrt | 88 | static inline uint32_t gxemul_irqc_get_sources(void) |
89 | { |
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90 | return *(uint32_t*) gxemul_hw_map.irqc; |
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91 | } |
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2263 | kebrt | 92 | |
2357 | kebrt | 93 | |
2340 | kebrt | 94 | /** Masks interrupt. |
95 | * |
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96 | * @param irq interrupt number |
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97 | */ |
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98 | static inline void gxemul_irqc_mask(uint32_t irq) |
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99 | { |
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100 | *(uint32_t*) gxemul_hw_map.irqc_mask = irq; |
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101 | } |
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102 | |||
2357 | kebrt | 103 | |
2340 | kebrt | 104 | /** Unmasks interrupt. |
105 | * |
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106 | * @param irq interrupt number |
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107 | */ |
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108 | static inline void gxemul_irqc_unmask(uint32_t irq) |
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109 | { |
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110 | *(uint32_t*) gxemul_hw_map.irqc_unmask = irq; |
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111 | } |
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112 | |||
2357 | kebrt | 113 | |
2263 | kebrt | 114 | /** Initializes #gxemul_hw_map. */ |
2358 | kebrt | 115 | void gxemul_hw_map_init(void) |
2263 | kebrt | 116 | { |
117 | gxemul_hw_map.videoram = hw_map(GXEMUL_VIDEORAM, PAGE_SIZE); |
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118 | gxemul_hw_map.kbd = hw_map(GXEMUL_KBD, PAGE_SIZE); |
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119 | gxemul_hw_map.rtc = hw_map(GXEMUL_RTC, PAGE_SIZE); |
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120 | gxemul_hw_map.irqc = hw_map(GXEMUL_IRQC, PAGE_SIZE); |
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121 | |||
122 | gxemul_hw_map.rtc_freq = gxemul_hw_map.rtc + GXEMUL_RTC_FREQ_OFFSET; |
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123 | gxemul_hw_map.rtc_ack = gxemul_hw_map.rtc + GXEMUL_RTC_ACK_OFFSET; |
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124 | gxemul_hw_map.irqc_mask = gxemul_hw_map.irqc + GXEMUL_IRQC_MASK_OFFSET; |
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125 | gxemul_hw_map.irqc_unmask = gxemul_hw_map.irqc + GXEMUL_IRQC_UNMASK_OFFSET; |
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2264 | kebrt | 126 | |
2290 | kebrt | 127 | hw_map_init_called = true; |
2263 | kebrt | 128 | } |
129 | |||
2357 | kebrt | 130 | |
2215 | kebrt | 131 | /** Putchar that works with gxemul */ |
2340 | kebrt | 132 | static void gxemul_write(chardev_t *dev, const char ch) |
2215 | kebrt | 133 | { |
2263 | kebrt | 134 | *((char *) gxemul_hw_map.videoram) = ch; |
2215 | kebrt | 135 | } |
136 | |||
2357 | kebrt | 137 | |
2215 | kebrt | 138 | /* Called from getc(). */ |
2340 | kebrt | 139 | static void gxemul_enable(chardev_t *dev) |
2215 | kebrt | 140 | { |
2245 | stepan | 141 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 142 | } |
143 | |||
2357 | kebrt | 144 | |
2215 | kebrt | 145 | /* Called from getc(). */ |
2340 | kebrt | 146 | static void gxemul_disable(chardev_t *dev) |
2215 | kebrt | 147 | { |
2245 | stepan | 148 | gxemul_irqc_mask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 149 | } |
150 | |||
2357 | kebrt | 151 | |
152 | /** Read character using polling, assume interrupts disabled. |
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153 | * |
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154 | * @param dev Not used. |
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155 | */ |
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2215 | kebrt | 156 | static char gxemul_do_read(chardev_t *dev) |
157 | { |
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158 | char ch; |
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159 | |||
160 | while (1) { |
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2263 | kebrt | 161 | ch = *((volatile char *) gxemul_hw_map.kbd); |
2215 | kebrt | 162 | if (ch) { |
163 | if (ch == '\r') |
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164 | return '\n'; |
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165 | if (ch == 0x7f) |
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166 | return '\b'; |
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167 | return ch; |
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168 | } |
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169 | } |
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170 | } |
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171 | |||
2357 | kebrt | 172 | |
2215 | kebrt | 173 | /** Process keyboard interrupt. */ |
174 | static void gxemul_irq_handler(irq_t *irq, void *arg, ...) |
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175 | { |
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2357 | kebrt | 176 | if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox)) { |
2215 | kebrt | 177 | ipc_irq_send_notif(irq); |
2357 | kebrt | 178 | } else { |
2215 | kebrt | 179 | char ch = 0; |
180 | |||
2357 | kebrt | 181 | ch = *((char *) gxemul_hw_map.kbd); |
182 | if (ch == '\r') { |
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183 | ch = '\n'; |
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184 | } |
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185 | if (ch == 0x7f) { |
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186 | ch = '\b'; |
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187 | } |
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188 | chardev_push_character(&console, ch); |
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2215 | kebrt | 189 | } |
190 | } |
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191 | |||
2357 | kebrt | 192 | |
2215 | kebrt | 193 | static irq_ownership_t gxemul_claim(void) |
194 | { |
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195 | return IRQ_ACCEPT; |
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196 | } |
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197 | |||
2357 | kebrt | 198 | |
2358 | kebrt | 199 | void gxemul_grab_console(void) |
2215 | kebrt | 200 | { |
201 | ipl_t ipl = interrupts_disable(); |
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2263 | kebrt | 202 | spinlock_lock(&gxemul_irq.lock); |
2215 | kebrt | 203 | gxemul_irq.notif_cfg.notify = false; |
204 | spinlock_unlock(&gxemul_irq.lock); |
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205 | interrupts_restore(ipl); |
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206 | } |
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207 | |||
2357 | kebrt | 208 | |
2358 | kebrt | 209 | void gxemul_release_console(void) |
2215 | kebrt | 210 | { |
211 | ipl_t ipl = interrupts_disable(); |
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212 | spinlock_lock(&gxemul_irq.lock); |
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2357 | kebrt | 213 | if (gxemul_irq.notif_cfg.answerbox) { |
2215 | kebrt | 214 | gxemul_irq.notif_cfg.notify = true; |
2357 | kebrt | 215 | } |
2215 | kebrt | 216 | spinlock_unlock(&gxemul_irq.lock); |
217 | interrupts_restore(ipl); |
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218 | } |
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219 | |||
220 | |||
2357 | kebrt | 221 | /** Initializes console object representing gxemul console. |
222 | * |
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223 | * @param Console device number. |
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224 | */ |
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2358 | kebrt | 225 | void gxemul_console_init(devno_t devno) |
2215 | kebrt | 226 | { |
2263 | kebrt | 227 | chardev_initialize("gxemul_console", &console, &gxemul_ops); |
2215 | kebrt | 228 | stdin = &console; |
229 | stdout = &console; |
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230 | |||
231 | irq_initialize(&gxemul_irq); |
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232 | gxemul_irq.devno = devno; |
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233 | gxemul_irq.inr = GXEMUL_KBD_IRQ; |
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234 | gxemul_irq.claim = gxemul_claim; |
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235 | gxemul_irq.handler = gxemul_irq_handler; |
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236 | irq_register(&gxemul_irq); |
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237 | |||
2245 | stepan | 238 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 239 | |
240 | sysinfo_set_item_val("kbd", NULL, true); |
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241 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
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242 | sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ); |
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2263 | kebrt | 243 | sysinfo_set_item_val("kbd.address.virtual", NULL, gxemul_hw_map.kbd); |
2215 | kebrt | 244 | } |
245 | |||
2245 | stepan | 246 | |
247 | |||
248 | /** Starts gxemul Real Time Clock device, which asserts regular interrupts. |
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249 | * |
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2357 | kebrt | 250 | * @param frequency Interrupts frequency (0 disables RTC). |
2245 | stepan | 251 | */ |
2340 | kebrt | 252 | static void gxemul_timer_start(uint32_t frequency) |
2245 | stepan | 253 | { |
2263 | kebrt | 254 | *(uint32_t*) gxemul_hw_map.rtc_freq = frequency; |
2245 | stepan | 255 | } |
256 | |||
2357 | kebrt | 257 | |
2245 | stepan | 258 | static irq_ownership_t gxemul_timer_claim(void) |
259 | { |
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260 | return IRQ_ACCEPT; |
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261 | } |
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262 | |||
2357 | kebrt | 263 | |
2355 | stepan | 264 | /** Timer interrupt handler. |
265 | * |
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2357 | kebrt | 266 | * @param irq Interrupt information. |
267 | * @param arg Not used. |
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2355 | stepan | 268 | */ |
2245 | stepan | 269 | static void gxemul_timer_irq_handler(irq_t *irq, void *arg, ...) |
270 | { |
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271 | /* TODO time drifts ?? |
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272 | unsigned long drift; |
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273 | |||
274 | drift = cp0_count_read() - nextcount; |
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275 | while (drift > cp0_compare_value) { |
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276 | drift -= cp0_compare_value; |
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277 | CPU->missed_clock_ticks++; |
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278 | } |
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279 | nextcount = cp0_count_read() + cp0_compare_value - drift; |
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280 | cp0_compare_write(nextcount); |
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281 | */ |
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282 | |||
283 | /* |
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284 | * We are holding a lock which prevents preemption. |
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285 | * Release the lock, call clock() and reacquire the lock again. |
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286 | */ |
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287 | spinlock_unlock(&irq->lock); |
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2286 | stepan | 288 | clock(); |
2245 | stepan | 289 | spinlock_lock(&irq->lock); |
2261 | stepan | 290 | |
291 | /* acknowledge tick */ |
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2263 | kebrt | 292 | *(uint32_t*) gxemul_hw_map.rtc_ack = 0; |
2245 | stepan | 293 | |
294 | /* TODO what's that? * |
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295 | if (virtual_timer_fnc != NULL) |
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296 | virtual_timer_fnc(); |
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297 | */ |
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298 | } |
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299 | |||
2357 | kebrt | 300 | |
301 | /** Initializes and registers timer interrupt handler. */ |
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2340 | kebrt | 302 | static void gxemul_timer_irq_init() |
2245 | stepan | 303 | { |
304 | irq_initialize(&gxemul_timer_irq); |
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305 | gxemul_timer_irq.devno = device_assign_devno(); |
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306 | gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ; |
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307 | gxemul_timer_irq.claim = gxemul_timer_claim; |
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308 | gxemul_timer_irq.handler = gxemul_timer_irq_handler; |
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2261 | stepan | 309 | |
2245 | stepan | 310 | irq_register(&gxemul_timer_irq); |
311 | } |
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312 | |||
2357 | kebrt | 313 | |
2355 | stepan | 314 | /** Starts timer. |
315 | * |
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316 | * Initiates regular timer interrupts after initializing |
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317 | * corresponding interrupt handler. |
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318 | */ |
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2358 | kebrt | 319 | void gxemul_timer_irq_start() |
2263 | kebrt | 320 | { |
2274 | kebrt | 321 | gxemul_timer_irq_init(); |
322 | gxemul_timer_start(GXEMUL_TIMER_FREQ); |
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323 | } |
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324 | |||
2357 | kebrt | 325 | |
2355 | stepan | 326 | /** Returns the size of emulated memory. |
327 | * |
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2357 | kebrt | 328 | * @return Size in bytes. |
2355 | stepan | 329 | */ |
2358 | kebrt | 330 | size_t gxemul_get_memory_size(void) |
2274 | kebrt | 331 | { |
2263 | kebrt | 332 | return *((int*)(GXEMUL_MP + GXEMUL_MP_MEMSIZE_OFFSET)); |
333 | } |
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2245 | stepan | 334 | |
2357 | kebrt | 335 | |
2358 | kebrt | 336 | void gxemul_debug_putc(char ch) |
2300 | kebrt | 337 | { |
338 | char * addr = 0; |
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2290 | kebrt | 339 | if (!hw_map_init_called) { |
2300 | kebrt | 340 | addr = (char *) GXEMUL_KBD; |
2290 | kebrt | 341 | } else { |
2300 | kebrt | 342 | addr = (char *) gxemul_hw_map.videoram; |
2290 | kebrt | 343 | } |
2300 | kebrt | 344 | |
345 | *(addr) = ch; |
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2264 | kebrt | 346 | } |
347 | |||
2357 | kebrt | 348 | |
2355 | stepan | 349 | /** Stops gxemul. */ |
2358 | kebrt | 350 | void gxemul_cpu_halt(void) |
2300 | kebrt | 351 | { |
352 | char * addr = 0; |
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353 | if (!hw_map_init_called) { |
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354 | addr = (char *) GXEMUL_KBD; |
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355 | } else { |
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356 | addr = (char *) gxemul_hw_map.videoram; |
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357 | } |
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358 | |||
359 | *(addr + GXEMUL_HALT_OFFSET) = '\0'; |
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360 | } |
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361 | |||
2357 | kebrt | 362 | |
2355 | stepan | 363 | /** Gxemul specific interrupt exception handler. |
364 | * |
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365 | * Determines sources of the interrupt from interrupt controller and |
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366 | * calls high-level handlers for them. |
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367 | * |
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2357 | kebrt | 368 | * @param exc_no Interrupt exception number. |
369 | * @param istate Saved processor state. |
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2355 | stepan | 370 | */ |
2358 | kebrt | 371 | void gxemul_irq_exception(int exc_no, istate_t *istate) |
2306 | kebrt | 372 | { |
373 | uint32_t sources = gxemul_irqc_get_sources(); |
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374 | int i = 0; |
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375 | for (; i < GXEMUL_IRQC_MAX_IRQ; i++) { |
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376 | if (sources & (1 << i)) { |
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377 | irq_t *irq = irq_dispatch_and_lock(i); |
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378 | if (irq) { |
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379 | /* The IRQ handler was found. */ |
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380 | irq->handler(irq, irq->arg); |
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381 | spinlock_unlock(&irq->lock); |
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382 | } else { |
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383 | /* Spurious interrupt.*/ |
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384 | dprintf("cpu%d: spurious interrupt (inum=%d)\n", CPU->id, i); |
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385 | } |
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386 | } |
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387 | } |
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388 | } |
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389 | |||
2340 | kebrt | 390 | |
2358 | kebrt | 391 | uintptr_t gxemul_get_fb_address(void) |
2357 | kebrt | 392 | { |
2360 | kebrt | 393 | return (uintptr_t) GXEMUL_FB; |
2357 | kebrt | 394 | } |
395 | |||
2215 | kebrt | 396 | /** @} |
397 | */ |