mman.c

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#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
 
#if defined(__x86_64__)
#include <sys/cdefs.h>
#include <machine/amd64.h>
#else
#error "Unsupported Architecture!"
#endif
 
#include <syscall.h>
 
int
getpagesizes(size_t *pagesize, int nelem)
{
#if defined(__x86_64__)
    if (pagesize) {
        if (nelem >= 1)
            pagesize[0] = PGSIZE;
        if (nelem >= 2)
            pagesize[1] = LARGE_PGSIZE;
        if (nelem >= 3)
            pagesize[2] = HUGE_PGSIZE;
        return (nelem > 3 ? 3 : nelem);
    }
    return 3;
#else
#error "Unsupported Architecture!"
#endif
}
 
void*
mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
{
    void *realAddr;
 
    if (!(flags & MAP_FIXED)) {
        // Find an address
    }
 
    if (flags & MAP_ANON) {
        realAddr = OSMemMap(addr, len, prot | flags);
    } else {
        abort();
    }
 
    // XXX: Update mapping
 
    return realAddr;
}
 
int
munmap(void *addr, size_t len)
{
    // XXX: Update mappings
 
    return OSMemUnmap(addr, len);
}
 
int
mprotect(void *addr, size_t len, int prot)
{
    // XXX: Update mappings
 
    return OSMemProtect(addr, len, prot);
}
 
int
madvise(void *addr, size_t len, int behav)
{
    return 0;
}