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Ignore whitespace Rev 4345 → Rev 4346

/branches/dynload/kernel/arch/arm32/src/drivers/gxemul.c
33,333 → 33,19
* @brief GXemul drivers.
*/
 
#include <interrupt.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
void *gxemul_kbd;
void *gxemul_rtc;
void *gxemul_irqc;
 
/* 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, bool silent);
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)
void gxemul_init(void)
{
return *((uint32_t *) gxemul_hw_map.irqc);
gxemul_kbd = (void *) hw_map(GXEMUL_KBD_ADDRESS, PAGE_SIZE);
gxemul_rtc = (void *) hw_map(GXEMUL_RTC_ADDRESS, PAGE_SIZE);
gxemul_irqc = (void *) hw_map(GXEMUL_IRQC_ADDRESS, PAGE_SIZE);
}
 
 
/** 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, bool silent)
{
if (!silent)
*((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.
*/
static void gxemul_irq_handler(irq_t *irq)
{
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(irq_t *irq)
{
return IRQ_ACCEPT;
}
 
/** 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(irq_t *irq)
{
return IRQ_ACCEPT;
}
 
/** Timer interrupt handler.
*
* @param irq Interrupt information.
* @param arg Not used.
*/
static void gxemul_timer_irq_handler(irq_t *irq)
{
/*
* 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);
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;
}
 
/** @}
*/