60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
#include <stdio.h>
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#include <stddef.h>
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#include <inttypes.h>
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#include <sys/mman.h>
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#include "memblock.h"
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/* we're working with 4MiB of simulated system RAM */
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#define MEMORY_SIZE 0x400000ULL
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int main(int argc, const char **argv)
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{
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void *system_memory = mmap(
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NULL,
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MEMORY_SIZE,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS,
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-1, 0);
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if (system_memory == MAP_FAILED) {
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perror("mmap");
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fprintf(stderr, "cannot allocate simulated system RAM buffer");
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return -1;
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}
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printf("allocated 0x%llx bytes of memory to act as system RAM at %p\n", MEMORY_SIZE, system_memory);
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memblock_add(0, MEMORY_SIZE);
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memblock_reserve(0x10000, 0x40000);
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memblock_reserve(0x60000, 0x20000);
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memblock_reserve(0x30000, 0x40000);
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memblock_reserve(0x100000, 0x10000);
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printf("memory regions:\n");
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memblock_iter_t it;
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for_each_mem_range(&it, 0, 0x100000) {
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printf("\t%08" PRIxPTR "-%08" PRIxPTR "\n",
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it.base,
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it.limit);
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}
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printf("reserved regions:\n");
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for_each_reserved_mem_range(&it, 0, 0x100000) {
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printf("\t%08" PRIxPTR "-%08" PRIxPTR "\n",
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it.base,
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it.limit);
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}
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printf("free regions:\n");
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for_each_free_mem_range(&it, 0, 0x100000) {
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printf("\t%08" PRIxPTR "-%08" PRIxPTR "\n",
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it.base,
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it.limit);
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}
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munmap(system_memory, MEMORY_SIZE);
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return 0;
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}
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