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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "runtime.h"
#include "os.h"
#include "defs.h"
#include "malloc.h"
enum {
MEM_COMMIT = 0x1000,
MEM_RESERVE = 0x2000,
MEM_RELEASE = 0x8000,
PAGE_EXECUTE_READWRITE = 0x40,
};
#pragma dynimport runtime·VirtualAlloc VirtualAlloc "kernel32.dll"
#pragma dynimport runtime·VirtualFree VirtualFree "kernel32.dll"
extern void *runtime·VirtualAlloc;
extern void *runtime·VirtualFree;
void*
runtime·SysAlloc(uintptr n)
{
mstats.sys += n;
return runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, (uintptr)(MEM_COMMIT|MEM_RESERVE), (uintptr)PAGE_EXECUTE_READWRITE);
}
void
runtime·SysUnused(void *v, uintptr n)
{
USED(v);
USED(n);
}
void
runtime·SysFree(void *v, uintptr n)
{
uintptr r;
mstats.sys -= n;
r = (uintptr)runtime·stdcall(runtime·VirtualFree, 3, v, (uintptr)0, (uintptr)MEM_RELEASE);
if(r == 0)
runtime·throw("runtime: failed to release pages");
}
void*
runtime·SysReserve(void *v, uintptr n)
{
// v is just a hint.
// First try at v.
v = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_RESERVE, (uintptr)PAGE_EXECUTE_READWRITE);
if(v != nil)
return v;
// Next let the kernel choose the address.
return runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, (uintptr)MEM_RESERVE, (uintptr)PAGE_EXECUTE_READWRITE);
}
void
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_COMMIT, (uintptr)PAGE_EXECUTE_READWRITE);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}
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