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#include "runtime.h"
#include "defs.h"
#include "os.h"
#include "malloc.h"
void*
runtime·SysAlloc(uintptr n)
{
void *v;
mstats.sys += n;
v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(v < (void*)4096)
return nil;
return v;
}
void
runtime·SysUnused(void *v, uintptr n)
{
USED(v);
USED(n);
// TODO(rsc): call madvise MADV_DONTNEED
}
void
runtime·SysFree(void *v, uintptr n)
{
mstats.sys -= n;
runtime·munmap(v, n);
}
void*
runtime·SysReserve(void *v, uintptr n)
{
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
}
enum
{
ENOMEM = 12,
};
void
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p == (void*)-ENOMEM)
runtime·throw("runtime: out of memory");
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}
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