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| /* |
| * Copyright (c) 2007 Michal Kebrt, Petr Stepan |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup arm32gxemul |
| * @{ |
| */ |
| /** @file |
| * @brief GXemul drivers. |
| */ |
| |
| #include <interrupt.h> |
| #include <ipc/irq.h> |
| #include <console/chardev.h> |
| #include <arch/drivers/gxemul.h> |
| #include <console/console.h> |
| #include <sysinfo/sysinfo.h> |
| #include <print.h> |
| #include <ddi/device.h> |
| #include <mm/page.h> |
| #include <arch/machine.h> |
| #include <arch/debug/print.h> |
| |
| /* Addresses of devices. */ |
| #define GXEMUL_VIDEORAM 0x10000000 |
| #define GXEMUL_KBD 0x10000000 |
| #define GXEMUL_HALT_OFFSET 0x10 |
| #define GXEMUL_RTC 0x15000000 |
| #define GXEMUL_RTC_FREQ_OFFSET 0x100 |
| #define GXEMUL_RTC_ACK_OFFSET 0x110 |
| #define GXEMUL_IRQC 0x16000000 |
| #define GXEMUL_IRQC_MASK_OFFSET 0x4 |
| #define GXEMUL_IRQC_UNMASK_OFFSET 0x8 |
| #define GXEMUL_MP 0x11000000 |
| #define GXEMUL_MP_MEMSIZE_OFFSET 0x0090 |
| #define GXEMUL_FB 0x12000000 |
| |
| /* IRQs */ |
| #define GXEMUL_KBD_IRQ 2 |
| #define GXEMUL_TIMER_IRQ 4 |
| |
| static gxemul_hw_map_t gxemul_hw_map; |
| static chardev_t console; |
| static irq_t gxemul_console_irq; |
| static irq_t gxemul_timer_irq; |
| |
| static bool hw_map_init_called = false; |
| |
| static void gxemul_kbd_enable(chardev_t *dev); |
| static void gxemul_kbd_disable(chardev_t *dev); |
| static void gxemul_write(chardev_t *dev, const char ch); |
| static char gxemul_do_read(chardev_t *dev); |
| |
| static chardev_operations_t gxemul_ops = { |
| .resume = gxemul_kbd_enable, |
| .suspend = gxemul_kbd_disable, |
| .write = gxemul_write, |
| .read = gxemul_do_read, |
| }; |
| |
| |
| /** Returns the mask of active interrupts. */ |
| static inline uint32_t gxemul_irqc_get_sources(void) |
| { |
| return *((uint32_t *) gxemul_hw_map.irqc); |
| } |
| |
| |
| /** Masks interrupt. |
| * |
| * @param irq interrupt number |
| */ |
| static inline void gxemul_irqc_mask(uint32_t irq) |
| { |
| *((uint32_t *) gxemul_hw_map.irqc_mask) = irq; |
| } |
| |
| |
| /** Unmasks interrupt. |
| * |
| * @param irq interrupt number |
| */ |
| static inline void gxemul_irqc_unmask(uint32_t irq) |
| { |
| *((uint32_t *) gxemul_hw_map.irqc_unmask) = irq; |
| } |
| |
| |
| /** Initializes #gxemul_hw_map. */ |
| void gxemul_hw_map_init(void) |
| { |
| gxemul_hw_map.videoram = hw_map(GXEMUL_VIDEORAM, PAGE_SIZE); |
| gxemul_hw_map.kbd = hw_map(GXEMUL_KBD, PAGE_SIZE); |
| gxemul_hw_map.rtc = hw_map(GXEMUL_RTC, PAGE_SIZE); |
| gxemul_hw_map.irqc = hw_map(GXEMUL_IRQC, PAGE_SIZE); |
| |
| gxemul_hw_map.rtc_freq = gxemul_hw_map.rtc + GXEMUL_RTC_FREQ_OFFSET; |
| gxemul_hw_map.rtc_ack = gxemul_hw_map.rtc + GXEMUL_RTC_ACK_OFFSET; |
| gxemul_hw_map.irqc_mask = gxemul_hw_map.irqc + GXEMUL_IRQC_MASK_OFFSET; |
| gxemul_hw_map.irqc_unmask = gxemul_hw_map.irqc + |
| GXEMUL_IRQC_UNMASK_OFFSET; |
| |
| hw_map_init_called = true; |
| } |
| |
| |
| /** Putchar that works with gxemul. |
| * |
| * @param dev Not used. |
| * @param ch Characted to be printed. |
| */ |
| static void gxemul_write(chardev_t *dev, const char ch) |
| { |
| *((char *) gxemul_hw_map.videoram) = ch; |
| } |
| |
| /** Enables gxemul keyboard (interrupt unmasked). |
| * |
| * @param dev Not used. |
| * |
| * Called from getc(). |
| */ |
| static void gxemul_kbd_enable(chardev_t *dev) |
| { |
| gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
| } |
| |
| /** Disables gxemul keyboard (interrupt masked). |
| * |
| * @param dev not used |
| * |
| * Called from getc(). |
| */ |
| static void gxemul_kbd_disable(chardev_t *dev) |
| { |
| gxemul_irqc_mask(GXEMUL_KBD_IRQ); |
| } |
| |
| /** Read character using polling, assume interrupts disabled. |
| * |
| * @param dev Not used. |
| */ |
| static char gxemul_do_read(chardev_t *dev) |
| { |
| char ch; |
| |
| while (1) { |
| ch = *((volatile char *) gxemul_hw_map.kbd); |
| if (ch) { |
| if (ch == '\r') |
| return '\n'; |
| if (ch == 0x7f) |
| return '\b'; |
| return ch; |
| } |
| } |
| } |
| |
| /** Process keyboard interrupt. |
| * |
| * @param irq IRQ information. |
| * @param arg Not used. |
| */ |
| static void gxemul_irq_handler(irq_t *irq, void *arg, ...) |
| { |
| if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox)) { |
| ipc_irq_send_notif(irq); |
| } else { |
| char ch = 0; |
| |
| ch = *((char *) gxemul_hw_map.kbd); |
| if (ch == '\r') { |
| ch = '\n'; |
| } |
| if (ch == 0x7f) { |
| ch = '\b'; |
| } |
| chardev_push_character(&console, ch); |
| } |
| } |
| |
| static irq_ownership_t gxemul_claim(void) |
| { |
| return IRQ_ACCEPT; |
| } |
| |
| |
| /** Acquire console back for kernel. */ |
| void gxemul_grab_console(void) |
| { |
| ipl_t ipl = interrupts_disable(); |
| spinlock_lock(&gxemul_console_irq.lock); |
| gxemul_console_irq.notif_cfg.notify = false; |
| spinlock_unlock(&gxemul_console_irq.lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Return console to userspace. */ |
| void gxemul_release_console(void) |
| { |
| ipl_t ipl = interrupts_disable(); |
| spinlock_lock(&gxemul_console_irq.lock); |
| if (gxemul_console_irq.notif_cfg.answerbox) { |
| gxemul_console_irq.notif_cfg.notify = true; |
| } |
| spinlock_unlock(&gxemul_console_irq.lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Initializes console object representing gxemul console. |
| * |
| * @param devno device number. |
| */ |
| void gxemul_console_init(devno_t devno) |
| { |
| chardev_initialize("gxemul_console", &console, &gxemul_ops); |
| stdin = &console; |
| stdout = &console; |
| |
| irq_initialize(&gxemul_console_irq); |
| gxemul_console_irq.devno = devno; |
| gxemul_console_irq.inr = GXEMUL_KBD_IRQ; |
| gxemul_console_irq.claim = gxemul_claim; |
| gxemul_console_irq.handler = gxemul_irq_handler; |
| irq_register(&gxemul_console_irq); |
| |
| gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
| |
| sysinfo_set_item_val("kbd", NULL, true); |
| sysinfo_set_item_val("kbd.devno", NULL, devno); |
| sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ); |
| sysinfo_set_item_val("kbd.address.virtual", NULL, gxemul_hw_map.kbd); |
| } |
| |
| /** Starts gxemul Real Time Clock device, which asserts regular interrupts. |
| * |
| * @param frequency Interrupts frequency (0 disables RTC). |
| */ |
| static void gxemul_timer_start(uint32_t frequency) |
| { |
| *((uint32_t*) gxemul_hw_map.rtc_freq) = frequency; |
| } |
| |
| static irq_ownership_t gxemul_timer_claim(void) |
| { |
| return IRQ_ACCEPT; |
| } |
| |
| /** Timer interrupt handler. |
| * |
| * @param irq Interrupt information. |
| * @param arg Not used. |
| */ |
| static void gxemul_timer_irq_handler(irq_t *irq, void *arg, ...) |
| { |
| /* |
| * We are holding a lock which prevents preemption. |
| * Release the lock, call clock() and reacquire the lock again. |
| */ |
| spinlock_unlock(&irq->lock); |
| clock(); |
| spinlock_lock(&irq->lock); |
| |
| /* acknowledge tick */ |
| *((uint32_t*) gxemul_hw_map.rtc_ack) = 0; |
| } |
| |
| /** Initializes and registers timer interrupt handler. */ |
| static void gxemul_timer_irq_init(void) |
| { |
| irq_initialize(&gxemul_timer_irq); |
| gxemul_timer_irq.devno = device_assign_devno(); |
| gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ; |
| gxemul_timer_irq.claim = gxemul_timer_claim; |
| gxemul_timer_irq.handler = gxemul_timer_irq_handler; |
| |
| irq_register(&gxemul_timer_irq); |
| } |
| |
| |
| /** Starts timer. |
| * |
| * Initiates regular timer interrupts after initializing |
| * corresponding interrupt handler. |
| */ |
| void gxemul_timer_irq_start(void) |
| { |
| gxemul_timer_irq_init(); |
| gxemul_timer_start(GXEMUL_TIMER_FREQ); |
| } |
| |
| /** Returns the size of emulated memory. |
| * |
| * @return Size in bytes. |
| */ |
| size_t gxemul_get_memory_size(void) |
| { |
| return *((int *) (GXEMUL_MP + GXEMUL_MP_MEMSIZE_OFFSET)); |
| } |
| |
| /** Prints a character. |
| * |
| * @param ch Character to be printed. |
| */ |
| void gxemul_debug_putc(char ch) |
| { |
| char *addr = 0; |
| if (!hw_map_init_called) { |
| addr = (char *) GXEMUL_KBD; |
| } else { |
| addr = (char *) gxemul_hw_map.videoram; |
| } |
| |
| *(addr) = ch; |
| } |
| |
| /** Stops gxemul. */ |
| void gxemul_cpu_halt(void) |
| { |
| char * addr = 0; |
| if (!hw_map_init_called) { |
| addr = (char *) GXEMUL_KBD; |
| } else { |
| addr = (char *) gxemul_hw_map.videoram; |
| } |
| |
| *(addr + GXEMUL_HALT_OFFSET) = '\0'; |
| } |
| |
| /** Gxemul specific interrupt exception handler. |
| * |
| * Determines sources of the interrupt from interrupt controller and |
| * calls high-level handlers for them. |
| * |
| * @param exc_no Interrupt exception number. |
| * @param istate Saved processor state. |
| */ |
| void gxemul_irq_exception(int exc_no, istate_t *istate) |
| { |
| uint32_t sources = gxemul_irqc_get_sources(); |
| int i; |
| |
| for (i = 0; i < GXEMUL_IRQC_MAX_IRQ; i++) { |
| if (sources & (1 << i)) { |
| irq_t *irq = irq_dispatch_and_lock(i); |
| if (irq) { |
| /* The IRQ handler was found. */ |
| irq->handler(irq, irq->arg); |
| spinlock_unlock(&irq->lock); |
| } else { |
| /* Spurious interrupt.*/ |
| dprintf("cpu%d: spurious interrupt (inum=%d)\n", |
| CPU->id, i); |
| } |
| } |
| } |
| } |
| |
| /** Returns address of framebuffer device. |
| * |
| * @return Address of framebuffer device. |
| */ |
| uintptr_t gxemul_get_fb_address(void) |
| { |
| return (uintptr_t) GXEMUL_FB; |
| } |
| |
| /** @} |
| */ |