49644a2c39
Port to the really neat 68010 based board at https://rosco-m68k.com/ Port Features: -10Mhz 68010 -1MB ram -Dual UART + timer implemented as a 68c681 chip -timer running at 1Khz, UART A for console -interrupt driven RX support Some amount of extending of the 68k exceptinon code was needed to support the autovectored irqs that the 68681 uart uses. Added build system support for 68010.
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* Copyright (c) 2018 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 <lk/err.h>
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#include <lk/reg.h>
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#include <lk/trace.h>
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#include <kernel/thread.h>
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#include <platform.h>
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#include <platform/interrupts.h>
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#include <platform/debug.h>
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#include <platform/timer.h>
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#include <platform/rosco-m68k.h>
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#include <sys/types.h>
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#if WITH_LIB_MINIP
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#include <lib/minip.h>
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#endif
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#include <kernel/novm.h>
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#if WITH_LIB_CONSOLE
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#include <lib/console.h>
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#endif
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#include "platform_p.h"
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#define LOCAL_TRACE 0
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extern uint8_t __bss_end;
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void platform_early_init(void) {
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duart_early_init();
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dprintf(INFO, "ROSCO-M68K: firmware structure at 0x400 - 0x41f:\n");
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hexdump((void *)0x400, 0x20);
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uint32_t cpu_info = *(uint32_t *)0x41c;
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printf("cpu family %u speed %u\n", cpu_info >> 29, cpu_info & 0x1fffffff);
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// TODO: probe memory
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// TODO: consider using firmware struct left around 0x400
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uint32_t membase = 0x0;
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uint32_t memsize = 0x100000; // 1MB
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dprintf(INFO, "ROSCO-M68K: memory base %#x size %#x\n", membase, memsize);
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novm_add_arena("mem", membase, memsize);
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// build a table of illegal instructions around 0 to try to catch bad branches
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volatile uint16_t *ptr = 0;
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for (int i = 0; i < 256; i++) {
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ptr[i] = 0x4afa; // undefined opcode
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}
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}
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void platform_init(void) {
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duart_init();
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}
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enum handler_return m68k_platform_irq(uint8_t irq) {
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LTRACEF("irq %u\n", irq);
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switch (irq) {
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case 0x45: // DUART irq
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return duart_irq();
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default:
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panic("unhandled platform irq %u\n", irq);
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}
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return INT_NO_RESCHEDULE;
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}
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