2010-01-13 18:50:02 -07:00
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#include "runtime.h"
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#include "defs.h"
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#include "os.h"
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#include "malloc.h"
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void*
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SysAlloc(uintptr n)
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{
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2010-09-28 18:30:01 -06:00
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void *v;
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2010-01-13 18:50:02 -07:00
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mstats.sys += n;
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2010-09-28 18:30:01 -06:00
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v = runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(v < (void*)4096) {
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printf("mmap: errno=%p\n", v);
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throw("mmap");
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}
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return v;
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2010-01-13 18:50:02 -07:00
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}
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void
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SysUnused(void *v, uintptr n)
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{
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USED(v);
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USED(n);
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// TODO(rsc): call madvise MADV_DONTNEED
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}
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void
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SysFree(void *v, uintptr n)
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{
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2010-09-27 10:50:01 -06:00
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mstats.sys -= n;
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2010-09-07 07:57:22 -06:00
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runtime_munmap(v, n);
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2010-01-13 18:50:02 -07:00
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}
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2010-09-28 18:30:01 -06:00
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void
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SysMemInit(void)
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{
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// Code generators assume that references to addresses
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// on the first page will fault. Map the page explicitly with
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// no permissions, to head off possible bugs like the system
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// allocating that page as the virtual address space fills.
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// Ignore any error, since other systems might be smart
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// enough to never allow anything there.
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// runtime_mmap(nil, 4096, PROT_NONE, MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
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}
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