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runtime: fix memory allocation on 386
BSD and Darwin require an extra page between end and the first mapping, and Windows has various memory in the way too. Fixes #1464. R=r, r2 CC=golang-dev https://golang.org/cl/4167041
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@ -286,10 +286,16 @@ runtime·mallocinit(void)
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// of address space, which is probably too much in a 32-bit world.
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bitmap_size = MaxArena32 / (sizeof(void*)*8/4);
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arena_size = 512<<20;
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p = (void*)(((uintptr)end + 64*1024 - 1) & ~(64*1024-1));
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if(runtime·SysReserve(p, bitmap_size + arena_size) != p)
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runtime·throw("runtime: cannot reserve memory bitmap virtual address space");
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// SysReserve treats the address we ask for, end, as a hint,
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// not as an absolute requirement. If we ask for the end
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// of the data segment but the operating system requires
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// a little more space before we can start allocating, it will
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// give out a slightly higher pointer. That's fine.
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// Run with what we get back.
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p = runtime·SysReserve(end, bitmap_size + arena_size);
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if(p == nil)
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runtime·throw("runtime: cannot reserve arena virtual address space");
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}
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runtime·mheap.bitmap = p;
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runtime·mheap.arena_start = p + bitmap_size;
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