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31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief GXemul drivers. |
33 | * @brief GXemul drivers. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <interrupt.h> |
- | |
37 | #include <console/chardev.h> |
- | |
38 | #include <arch/drivers/gxemul.h> |
36 | #include <arch/drivers/gxemul.h> |
39 | #include <console/console.h> |
- | |
40 | #include <sysinfo/sysinfo.h> |
- | |
41 | #include <print.h> |
- | |
42 | #include <ddi/device.h> |
- | |
43 | #include <mm/page.h> |
37 | #include <mm/page.h> |
44 | #include <arch/machine.h> |
- | |
45 | #include <arch/debug/print.h> |
- | |
46 | 38 | ||
47 | /* Addresses of devices. */ |
- | |
48 | #define GXEMUL_VIDEORAM 0x10000000 |
- | |
49 | #define GXEMUL_KBD 0x10000000 |
- | |
50 | #define GXEMUL_HALT_OFFSET 0x10 |
- | |
51 | #define GXEMUL_RTC 0x15000000 |
- | |
52 | #define GXEMUL_RTC_FREQ_OFFSET 0x100 |
- | |
53 | #define GXEMUL_RTC_ACK_OFFSET 0x110 |
- | |
54 | #define GXEMUL_IRQC 0x16000000 |
- | |
55 | #define GXEMUL_IRQC_MASK_OFFSET 0x4 |
- | |
56 | #define GXEMUL_IRQC_UNMASK_OFFSET 0x8 |
- | |
57 | #define GXEMUL_MP 0x11000000 |
- | |
58 | #define GXEMUL_MP_MEMSIZE_OFFSET 0x0090 |
- | |
59 | #define GXEMUL_FB 0x12000000 |
- | |
60 | - | ||
61 | /* IRQs */ |
- | |
62 | #define GXEMUL_KBD_IRQ 2 |
- | |
63 | #define GXEMUL_TIMER_IRQ 4 |
- | |
64 | - | ||
65 | static gxemul_hw_map_t gxemul_hw_map; |
- | |
66 | static chardev_t console; |
- | |
67 | static irq_t gxemul_console_irq; |
- | |
68 | static irq_t gxemul_timer_irq; |
- | |
69 | - | ||
70 | static bool hw_map_init_called = false; |
- | |
71 | - | ||
72 | static void gxemul_kbd_enable(chardev_t *dev); |
- | |
73 | static void gxemul_kbd_disable(chardev_t *dev); |
- | |
74 | static void gxemul_write(chardev_t *dev, const char ch, bool silent); |
- | |
75 | static char gxemul_do_read(chardev_t *dev); |
- | |
76 | - | ||
77 | static chardev_operations_t gxemul_ops = { |
- | |
78 | .resume = gxemul_kbd_enable, |
39 | void *gxemul_kbd; |
79 | .suspend = gxemul_kbd_disable, |
- | |
80 | .write = gxemul_write, |
40 | void *gxemul_rtc; |
81 | .read = gxemul_do_read, |
41 | void *gxemul_irqc; |
82 | }; |
- | |
83 | - | ||
84 | - | ||
85 | /** Returns the mask of active interrupts. */ |
- | |
86 | static inline uint32_t gxemul_irqc_get_sources(void) |
- | |
87 | { |
- | |
88 | return *((uint32_t *) gxemul_hw_map.irqc); |
- | |
89 | } |
- | |
90 | - | ||
91 | - | ||
92 | /** Masks interrupt. |
- | |
93 | * |
- | |
94 | * @param irq interrupt number |
- | |
95 | */ |
- | |
96 | static inline void gxemul_irqc_mask(uint32_t irq) |
- | |
97 | { |
- | |
98 | *((uint32_t *) gxemul_hw_map.irqc_mask) = irq; |
- | |
99 | } |
- | |
100 | - | ||
101 | - | ||
102 | /** Unmasks interrupt. |
- | |
103 | * |
- | |
104 | * @param irq interrupt number |
- | |
105 | */ |
- | |
106 | static inline void gxemul_irqc_unmask(uint32_t irq) |
- | |
107 | { |
- | |
108 | *((uint32_t *) gxemul_hw_map.irqc_unmask) = irq; |
- | |
109 | } |
- | |
110 | - | ||
111 | 42 | ||
112 | /** Initializes #gxemul_hw_map. */ |
- | |
113 | void gxemul_hw_map_init(void) |
43 | void gxemul_init(void) |
114 | { |
44 | { |
115 | gxemul_hw_map.videoram = hw_map(GXEMUL_VIDEORAM, PAGE_SIZE); |
- | |
116 | gxemul_hw_map.kbd = hw_map(GXEMUL_KBD, PAGE_SIZE); |
45 | gxemul_kbd = (void *) hw_map(GXEMUL_KBD_ADDRESS, PAGE_SIZE); |
117 | gxemul_hw_map.rtc = hw_map(GXEMUL_RTC, PAGE_SIZE); |
46 | gxemul_rtc = (void *) hw_map(GXEMUL_RTC_ADDRESS, PAGE_SIZE); |
118 | gxemul_hw_map.irqc = hw_map(GXEMUL_IRQC, PAGE_SIZE); |
47 | gxemul_irqc = (void *) hw_map(GXEMUL_IRQC_ADDRESS, PAGE_SIZE); |
119 | - | ||
120 | gxemul_hw_map.rtc_freq = gxemul_hw_map.rtc + GXEMUL_RTC_FREQ_OFFSET; |
- | |
121 | gxemul_hw_map.rtc_ack = gxemul_hw_map.rtc + GXEMUL_RTC_ACK_OFFSET; |
- | |
122 | gxemul_hw_map.irqc_mask = gxemul_hw_map.irqc + GXEMUL_IRQC_MASK_OFFSET; |
- | |
123 | gxemul_hw_map.irqc_unmask = gxemul_hw_map.irqc + |
- | |
124 | GXEMUL_IRQC_UNMASK_OFFSET; |
- | |
125 | - | ||
126 | hw_map_init_called = true; |
- | |
127 | } |
- | |
128 | - | ||
129 | - | ||
130 | /** Putchar that works with gxemul. |
- | |
131 | * |
- | |
132 | * @param dev Not used. |
- | |
133 | * @param ch Characted to be printed. |
- | |
134 | */ |
- | |
135 | static void gxemul_write(chardev_t *dev, const char ch, bool silent) |
- | |
136 | { |
- | |
137 | if (!silent) |
- | |
138 | *((char *) gxemul_hw_map.videoram) = ch; |
- | |
139 | } |
- | |
140 | - | ||
141 | /** Enables gxemul keyboard (interrupt unmasked). |
- | |
142 | * |
- | |
143 | * @param dev Not used. |
- | |
144 | * |
- | |
145 | * Called from getc(). |
- | |
146 | */ |
- | |
147 | static void gxemul_kbd_enable(chardev_t *dev) |
- | |
148 | { |
- | |
149 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
- | |
150 | } |
- | |
151 | - | ||
152 | /** Disables gxemul keyboard (interrupt masked). |
- | |
153 | * |
- | |
154 | * @param dev not used |
- | |
155 | * |
- | |
156 | * Called from getc(). |
- | |
157 | */ |
- | |
158 | static void gxemul_kbd_disable(chardev_t *dev) |
- | |
159 | { |
- | |
160 | gxemul_irqc_mask(GXEMUL_KBD_IRQ); |
- | |
161 | } |
- | |
162 | - | ||
163 | /** Read character using polling, assume interrupts disabled. |
- | |
164 | * |
- | |
165 | * @param dev Not used. |
- | |
166 | */ |
- | |
167 | static char gxemul_do_read(chardev_t *dev) |
- | |
168 | { |
- | |
169 | char ch; |
- | |
170 | - | ||
171 | while (1) { |
- | |
172 | ch = *((volatile char *) gxemul_hw_map.kbd); |
- | |
173 | if (ch) { |
- | |
174 | if (ch == '\r') |
- | |
175 | return '\n'; |
- | |
176 | if (ch == 0x7f) |
- | |
177 | return '\b'; |
- | |
178 | return ch; |
- | |
179 | } |
- | |
180 | } |
- | |
181 | } |
- | |
182 | - | ||
183 | /** Process keyboard interrupt. |
- | |
184 | * |
- | |
185 | * @param irq IRQ information. |
- | |
186 | */ |
- | |
187 | static void gxemul_irq_handler(irq_t *irq) |
- | |
188 | { |
- | |
189 | char ch = 0; |
- | |
190 | - | ||
191 | ch = *((char *) gxemul_hw_map.kbd); |
- | |
192 | if (ch == '\r') { |
- | |
193 | ch = '\n'; |
- | |
194 | } |
- | |
195 | if (ch == 0x7f) { |
- | |
196 | ch = '\b'; |
- | |
197 | } |
- | |
198 | chardev_push_character(&console, ch); |
- | |
199 | } |
- | |
200 | - | ||
201 | static irq_ownership_t gxemul_claim(irq_t *irq) |
- | |
202 | { |
- | |
203 | return IRQ_ACCEPT; |
- | |
204 | } |
- | |
205 | - | ||
206 | /** Initializes console object representing gxemul console. |
- | |
207 | * |
- | |
208 | * @param devno device number. |
- | |
209 | */ |
- | |
210 | void gxemul_console_init(devno_t devno) |
- | |
211 | { |
- | |
212 | chardev_initialize("gxemul_console", &console, &gxemul_ops); |
- | |
213 | stdin = &console; |
- | |
214 | stdout = &console; |
- | |
215 | - | ||
216 | irq_initialize(&gxemul_console_irq); |
- | |
217 | gxemul_console_irq.devno = devno; |
- | |
218 | gxemul_console_irq.inr = GXEMUL_KBD_IRQ; |
- | |
219 | gxemul_console_irq.claim = gxemul_claim; |
- | |
220 | gxemul_console_irq.handler = gxemul_irq_handler; |
- | |
221 | irq_register(&gxemul_console_irq); |
- | |
222 | - | ||
223 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
- | |
224 | - | ||
225 | sysinfo_set_item_val("kbd", NULL, true); |
- | |
226 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
- | |
227 | sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ); |
- | |
228 | sysinfo_set_item_val("kbd.address.virtual", NULL, gxemul_hw_map.kbd); |
- | |
229 | } |
- | |
230 | - | ||
231 | /** Starts gxemul Real Time Clock device, which asserts regular interrupts. |
- | |
232 | * |
- | |
233 | * @param frequency Interrupts frequency (0 disables RTC). |
- | |
234 | */ |
- | |
235 | static void gxemul_timer_start(uint32_t frequency) |
- | |
236 | { |
- | |
237 | *((uint32_t*) gxemul_hw_map.rtc_freq) = frequency; |
- | |
238 | } |
- | |
239 | - | ||
240 | static irq_ownership_t gxemul_timer_claim(irq_t *irq) |
- | |
241 | { |
- | |
242 | return IRQ_ACCEPT; |
- | |
243 | } |
- | |
244 | - | ||
245 | /** Timer interrupt handler. |
- | |
246 | * |
- | |
247 | * @param irq Interrupt information. |
- | |
248 | * @param arg Not used. |
- | |
249 | */ |
- | |
250 | static void gxemul_timer_irq_handler(irq_t *irq) |
- | |
251 | { |
- | |
252 | /* |
- | |
253 | * We are holding a lock which prevents preemption. |
- | |
254 | * Release the lock, call clock() and reacquire the lock again. |
- | |
255 | */ |
- | |
256 | spinlock_unlock(&irq->lock); |
- | |
257 | clock(); |
- | |
258 | spinlock_lock(&irq->lock); |
- | |
259 | - | ||
260 | /* acknowledge tick */ |
- | |
261 | *((uint32_t*) gxemul_hw_map.rtc_ack) = 0; |
- | |
262 | } |
- | |
263 | - | ||
264 | /** Initializes and registers timer interrupt handler. */ |
- | |
265 | static void gxemul_timer_irq_init(void) |
- | |
266 | { |
- | |
267 | irq_initialize(&gxemul_timer_irq); |
- | |
268 | gxemul_timer_irq.devno = device_assign_devno(); |
- | |
269 | gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ; |
- | |
270 | gxemul_timer_irq.claim = gxemul_timer_claim; |
- | |
271 | gxemul_timer_irq.handler = gxemul_timer_irq_handler; |
- | |
272 | - | ||
273 | irq_register(&gxemul_timer_irq); |
- | |
274 | } |
- | |
275 | - | ||
276 | - | ||
277 | /** Starts timer. |
- | |
278 | * |
- | |
279 | * Initiates regular timer interrupts after initializing |
- | |
280 | * corresponding interrupt handler. |
- | |
281 | */ |
- | |
282 | void gxemul_timer_irq_start(void) |
- | |
283 | { |
- | |
284 | gxemul_timer_irq_init(); |
- | |
285 | gxemul_timer_start(GXEMUL_TIMER_FREQ); |
- | |
286 | } |
- | |
287 | - | ||
288 | /** Returns the size of emulated memory. |
- | |
289 | * |
- | |
290 | * @return Size in bytes. |
- | |
291 | */ |
- | |
292 | size_t gxemul_get_memory_size(void) |
- | |
293 | { |
- | |
294 | return *((int *) (GXEMUL_MP + GXEMUL_MP_MEMSIZE_OFFSET)); |
- | |
295 | } |
- | |
296 | - | ||
297 | /** Prints a character. |
- | |
298 | * |
- | |
299 | * @param ch Character to be printed. |
- | |
300 | */ |
- | |
301 | void gxemul_debug_putc(char ch) |
- | |
302 | { |
- | |
303 | char *addr = 0; |
- | |
304 | if (!hw_map_init_called) { |
- | |
305 | addr = (char *) GXEMUL_KBD; |
- | |
306 | } else { |
- | |
307 | addr = (char *) gxemul_hw_map.videoram; |
- | |
308 | } |
- | |
309 | - | ||
310 | *(addr) = ch; |
- | |
311 | } |
- | |
312 | - | ||
313 | /** Stops gxemul. */ |
- | |
314 | void gxemul_cpu_halt(void) |
- | |
315 | { |
- | |
316 | char * addr = 0; |
- | |
317 | if (!hw_map_init_called) { |
- | |
318 | addr = (char *) GXEMUL_KBD; |
- | |
319 | } else { |
- | |
320 | addr = (char *) gxemul_hw_map.videoram; |
- | |
321 | } |
- | |
322 | - | ||
323 | *(addr + GXEMUL_HALT_OFFSET) = '\0'; |
- | |
324 | } |
- | |
325 | - | ||
326 | /** Gxemul specific interrupt exception handler. |
- | |
327 | * |
- | |
328 | * Determines sources of the interrupt from interrupt controller and |
- | |
329 | * calls high-level handlers for them. |
- | |
330 | * |
- | |
331 | * @param exc_no Interrupt exception number. |
- | |
332 | * @param istate Saved processor state. |
- | |
333 | */ |
- | |
334 | void gxemul_irq_exception(int exc_no, istate_t *istate) |
- | |
335 | { |
- | |
336 | uint32_t sources = gxemul_irqc_get_sources(); |
- | |
337 | int i; |
- | |
338 | - | ||
339 | for (i = 0; i < GXEMUL_IRQC_MAX_IRQ; i++) { |
- | |
340 | if (sources & (1 << i)) { |
- | |
341 | irq_t *irq = irq_dispatch_and_lock(i); |
- | |
342 | if (irq) { |
- | |
343 | /* The IRQ handler was found. */ |
- | |
344 | irq->handler(irq); |
- | |
345 | spinlock_unlock(&irq->lock); |
- | |
346 | } else { |
- | |
347 | /* Spurious interrupt.*/ |
- | |
348 | dprintf("cpu%d: spurious interrupt (inum=%d)\n", |
- | |
349 | CPU->id, i); |
- | |
350 | } |
- | |
351 | } |
- | |
352 | } |
- | |
353 | } |
- | |
354 | - | ||
355 | /** Returns address of framebuffer device. |
- | |
356 | * |
- | |
357 | * @return Address of framebuffer device. |
- | |
358 | */ |
- | |
359 | uintptr_t gxemul_get_fb_address(void) |
- | |
360 | { |
- | |
361 | return (uintptr_t) GXEMUL_FB; |
- | |
362 | } |
48 | } |
363 | 49 | ||
364 | /** @} |
50 | /** @} |
365 | */ |
51 | */ |