69 lines
1.7 KiB
C
69 lines
1.7 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 <socks/memblock.h>
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/* we're working with 4MiB of simulated system RAM */
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#define MEMORY_SIZE_MB 128
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/* virtual address of where system memory is mapped */
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static void *system_memory = NULL;
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#define MEMPTR(offset) ((uintptr_t)system_memory + (offset))
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#define MB_TO_BYTES(v) ((size_t)(v) * 0x100000)
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#define PHYS_TO_VIRT(p) ((void *)((uintptr_t)system_memory + (p)))
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#define VIRT_TO_PHYS(p) ((void *)((p) - (uintptr_t)system_memory))
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int main(int argc, const char **argv)
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{
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system_memory = mmap(
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NULL,
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MB_TO_BYTES(MEMORY_SIZE_MB),
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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\n");
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return -1;
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}
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printf("allocated %u MiB (0x%zx bytes) of memory to act as system RAM at %p\n", MEMORY_SIZE_MB, MB_TO_BYTES(MEMORY_SIZE_MB), system_memory);
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memblock_add(0, MB_TO_BYTES(MEMORY_SIZE_MB));
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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, ULLONG_MAX) {
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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, MB_TO_BYTES(MEMORY_SIZE_MB));
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return 0;
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}
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