7102838b49
This lets some code decide whether or not there's any mmu present to use. Also kernel VM will complain if it isn't set as an extra safety.
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* Copyright (c) 2015 Stefan Kristiansson
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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/reg.h>
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#include <kernel/thread.h>
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#include <dev/uart.h>
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#include <dev/timer/or1k_ticktimer.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/or1ksim.h>
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#include <sys/types.h>
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#include <target/debugconfig.h>
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#if WITH_KERNEL_VM
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#include <kernel/vm.h>
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#endif
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struct mmu_initial_mapping mmu_initial_mappings[] = {
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/* 32 MB of RAM space */
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{
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.phys = 0x0,
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.virt = KERNEL_BASE,
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.size = 32*1024*1024,
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.flags = 0,
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.name = "memory"
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},
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/* peripherals */
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{
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.phys = 0x90000000,
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.virt = 0x90000000,
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.size = 0x04000000,
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.flags = MMU_INITIAL_MAPPING_FLAG_DEVICE,
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.name = "peripherals"
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},
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/* identity map to let the boot code run */
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{
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.phys = 0,
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.virt = 0,
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.size = 1024*1024*1024,
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.flags = MMU_INITIAL_MAPPING_TEMPORARY
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},
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/* null entry to terminate the list */
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{ 0 }
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};
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static pmm_arena_t ram_arena = {
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.name = "ram",
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.base = 0,
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.size = MEMSIZE,
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.flags = PMM_ARENA_FLAG_KMAP
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};
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void platform_dputc(char c) {
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if (c == '\n')
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uart_putc(DEBUG_UART, '\r');
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uart_putc(DEBUG_UART, c);
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}
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int platform_dgetc(char *c, bool wait) {
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int _c;
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if ((_c = uart_getc(DEBUG_UART, false)) < 0)
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return -1;
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*c = _c;
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return 0;
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}
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void platform_early_init(void) {
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uart_init_early();
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or1k_ticktimer_init(TIMER_CLOCK_FREQ);
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#if WITH_KERNEL_VM
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pmm_add_arena(&ram_arena);
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#endif
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}
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