83 lines
3.7 KiB
C
83 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/macros.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/memoryrangeentry.h"
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#include "libc/sysv/consts/madv.h"
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#include "libc/sysv/errfuns.h"
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forceinline typeof(PrefetchVirtualMemory) *GetPrefetchVirtualMemory(void) {
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static bool once;
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static typeof(PrefetchVirtualMemory) *PrefetchVirtualMemory_;
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if (!once) {
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once = true;
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PrefetchVirtualMemory_ = /* win8.1+ */
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getprocaddressmodule("KernelBase.dll", "PrefetchVirtualMemory");
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}
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return PrefetchVirtualMemory_;
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}
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forceinline typeof(OfferVirtualMemory) *GetOfferVirtualMemory(void) {
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static bool once;
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static typeof(OfferVirtualMemory) *OfferVirtualMemory_;
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if (!once) {
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once = true;
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OfferVirtualMemory_ = /* win8.1+ */
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getprocaddressmodule("KernelBase.dll", "OfferVirtualMemory");
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}
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return OfferVirtualMemory_;
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}
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textwindows int madvise$nt(void *addr, size_t length, int advice) {
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uint32_t rangecount;
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struct NtMemoryRangeEntry ranges[1];
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if ((advice & (int)MADV_WILLNEED) == (int)MADV_WILLNEED ||
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(advice & (int)MADV_SEQUENTIAL) == (int)MADV_SEQUENTIAL) {
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typeof(PrefetchVirtualMemory) *fn = GetPrefetchVirtualMemory();
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if (fn) {
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ranges[0].VirtualAddress = addr;
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ranges[0].NumberOfBytes = length;
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rangecount = ARRAYLEN(ranges);
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if (fn(GetCurrentProcess(), &rangecount, ranges, 0)) {
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return 0;
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} else {
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return winerr();
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}
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} else {
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return enosys();
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}
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} else if ((advice & (int)MADV_FREE) == (int)MADV_FREE) {
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typeof(OfferVirtualMemory) *fn = GetOfferVirtualMemory();
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if (fn) {
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if (fn(addr, length, kNtVmOfferPriorityNormal)) {
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return 0;
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} else {
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return winerr();
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}
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} else {
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return enosys();
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}
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} else {
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return einval();
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}
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}
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