Create variables for page size

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Justine Tunney 2024-07-18 21:02:59 -07:00
parent 23dfb79d33
commit 567d8fe32d
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34 changed files with 137 additions and 101 deletions

47
libc/intrin/pagesize.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2023 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "libc/dce.h"
#include "libc/intrin/kprintf.h"
#include "libc/nt/struct/systeminfo.h"
#include "libc/nt/systeminfo.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/auxv.h"
#ifdef __x86_64__
__static_yoink("_init_pagesize");
#endif
int __pagesize;
int __gransize;
textstartup static int __pagesize_get(unsigned long *auxv) {
for (; auxv && auxv[0]; auxv += 2)
if (auxv[0] == AT_PAGESZ)
return auxv[1];
#ifdef __aarch64__
return 16384;
#else
return 4096;
#endif
}
textstartup dontinstrument void __pagesize_init(unsigned long *auxv) {
if (!__pagesize)
__gransize = __pagesize = __pagesize_get(auxv);
}