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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 "arch_GOARCH.h"
#include "os_GOOS.h"
#include "defs_GOOS_GOARCH.h"
#include "malloc.h"
enum {
MEM_COMMIT = 0x1000,
MEM_RESERVE = 0x2000,
MEM_DECOMMIT = 0x4000,
MEM_RELEASE = 0x8000,
PAGE_READWRITE = 0x0004,
};
#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, uint64 *stat)
{
runtime·xadd64(stat, n);
return runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, (uintptr)(MEM_COMMIT|MEM_RESERVE), (uintptr)PAGE_READWRITE);
}
void
runtime·SysUnused(void *v, uintptr n)
{
void *r;
r = runtime·stdcall(runtime·VirtualFree, 3, v, n, (uintptr)MEM_DECOMMIT);
if(r == nil)
runtime·throw("runtime: failed to decommit pages");
}
void
runtime·SysUsed(void *v, uintptr n)
{
void *r;
r = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_COMMIT, (uintptr)PAGE_READWRITE);
if(r != v)
runtime·throw("runtime: failed to commit pages");
}
void
runtime·SysFree(void *v, uintptr n, uint64 *stat)
{
uintptr r;
runtime·xadd64(stat, -(uint64)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_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_READWRITE);
}
void
runtime·SysMap(void *v, uintptr n, uint64 *stat)
{
void *p;
runtime·xadd64(stat, n);
p = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_COMMIT, (uintptr)PAGE_READWRITE);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}
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