12fee4b59a
Uses the QEMU virt machine for 68k defined in qemu 6.0+. Basic support that boots, prints to the console, takes input from console, and context switches. TODO: interrupt support, timer support.
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/*
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* Copyright (c) 2021 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include "platform_p.h"
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#include <assert.h>
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#include <lk/err.h>
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#include <lk/debug.h>
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#include <lk/reg.h>
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#include <lk/trace.h>
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#include <kernel/debug.h>
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#include <kernel/thread.h>
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#include <platform/interrupts.h>
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#include <platform/virt.h>
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#include <platform/timer.h>
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#define LOCAL_TRACE 0
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static platform_timer_callback t_callback;
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static volatile uint ticks = 0;
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static lk_time_t periodic_interval;
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void goldfish_rtc_early_init(void) {
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}
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void goldfish_rtc_init(void) {
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}
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lk_bigtime_t current_time_hires(void) {
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static lk_bigtime_t bt = 0;
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return ++bt;
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}
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lk_time_t current_time(void) {
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static lk_time_t time = 0;
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return ++time;
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}
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status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval) {
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LTRACEF("callback %p, arg %p, interval %u\n", callback, arg, interval);
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t_callback = callback;
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periodic_interval = interval;
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#if 0
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uint32_t ticks = periodic_interval * 1000; /* timer is running close to 1Mhz */
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ASSERT(ticks <= 0xffff);
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TIMREG(IEN(0)) = (1<<0); // interval interrupt
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TIMREG(INTERVAL_VAL(0)) = ticks;
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TIMREG(CNT_CTRL(0)) = (1<<5) | (1<<4) | (1<<1); // no wave, reset, interval mode
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unmask_interrupt(TTC0_A_INT);
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#endif
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return NO_ERROR;
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}
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