root/src/pkg/runtime/mem_netbsd.c

DEFINITIONS

1. runtimeﾂｷSysAlloc
2. runtimeﾂｷSysUnused
3. runtimeﾂｷSysUsed
4. runtimeﾂｷSysFree
5. runtimeﾂｷSysFault
6. runtimeﾂｷSysReserve
7. runtimeﾂｷSysMap

// 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 "defs_GOOS_GOARCH.h"
#include "os_GOOS.h"
#include "malloc.h"

enum
{
        ENOMEM = 12,
};

void*
runtimeﾂｷSysAlloc(uintptr n, uint64 *stat)
{
        void *v;

        v = runtimeﾂｷmmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
        if(v < (void*)4096)
                return nil;
        runtimeﾂｷxadd64(stat, n);
        return v;
}

void
runtimeﾂｷSysUnused(void *v, uintptr n)
{
        runtimeﾂｷmadvise(v, n, MADV_FREE);
}

void
runtimeﾂｷSysUsed(void *v, uintptr n)
{
        USED(v);
        USED(n);
}

void
runtimeﾂｷSysFree(void *v, uintptr n, uint64 *stat)
{
        runtimeﾂｷxadd64(stat, -(uint64)n);
        runtimeﾂｷmunmap(v, n);
}

void
runtimeﾂｷSysFault(void *v, uintptr n)
{
        runtimeﾂｷmmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}

void*
runtimeﾂｷSysReserve(void *v, uintptr n, bool *reserved)
{
        void *p;

        // On 64-bit, people with ulimit -v set complain if we reserve too
        // much address space.  Instead, assume that the reservation is okay
        // and check the assumption in SysMap.
        if(sizeof(void*) == 8 && n > 1LL<<32) {
                *reserved = false;
                return v;
        }

        p = runtimeﾂｷmmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
        if(p < (void*)4096)
                return nil;
        *reserved = true;
        return p;
}

void
runtimeﾂｷSysMap(void *v, uintptr n, bool reserved, uint64 *stat)
{
        void *p;
        
        runtimeﾂｷxadd64(stat, n);

        // On 64-bit, we don't actually have v reserved, so tread carefully.
        if(!reserved) {
                p = runtimeﾂｷmmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
                if(p == (void*)ENOMEM)
                        runtimeﾂｷthrow("runtime: out of memory");
                if(p != v) {
                        runtimeﾂｷprintf("runtime: address space conflict: map(%p) = %p\n", v, p);
                        runtimeﾂｷthrow("runtime: address space conflict");
                }
                return;
        }

        p = runtimeﾂｷmmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
        if(p == (void*)ENOMEM)
                runtimeﾂｷthrow("runtime: out of memory");
        if(p != v)
                runtimeﾂｷthrow("runtime: cannot map pages in arena address space");
}