/*
 * Example of using hugepage memory in a user application using the mmap
 * system call with MAP_HUGETLB flag.  Before running this program make
 * sure the administrator has allocated enough default sized huge pages
 * to cover the 256 MB allocation.
 *
 * For ia64 architecture, Linux kernel reserves Region number 4 for hugepages.
 * That means the addresses starting with 0x800000... will need to be
 * specified.  Specifying a fixed address is not required on ppc64, i386
 * or x86_64.
 */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>

#define LENGTH (256UL*1024*1024)
#define PROTECTION (PROT_READ | PROT_WRITE)

#ifndef MAP_HUGETLB
#define MAP_HUGETLB 0x40000 /* arch specific */
#endif

/* Only ia64 requires this */
#ifdef __ia64__
#define ADDR (void *)(0x8000000000000000UL)
#define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_FIXED)
#else
#define ADDR (void *)(0x0UL)
#define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB)
#endif

static void check_bytes(char *addr)
{
	printf("First hex is %x\n", *((unsigned int *)addr));
}

static void write_bytes(char *addr)
{
	unsigned long i;

	for (i = 0; i < LENGTH; i++)
		*(addr + i) = (char)i;
}

static int read_bytes(char *addr)
{
	unsigned long i;

	check_bytes(addr);
	for (i = 0; i < LENGTH; i++)
		if (*(addr + i) != (char)i) {
			printf("Mismatch at %lu\n", i);
			return 1;
		}
	return 0;
}

int main(void)
{
	void *addr;
	int ret;

	addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, 0, 0);
	if (addr == MAP_FAILED) {
		perror("mmap");
		exit(1);
	}

	printf("Returned address is %p\n", addr);
	check_bytes(addr);
	write_bytes(addr);
	ret = read_bytes(addr);

	/* munmap() length of MAP_HUGETLB memory must be hugepage aligned */
	if (munmap(addr, LENGTH)) {
		perror("munmap");
		exit(1);
	}

	return ret;
}
c741d6770fb0986aef24'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/crypto/cast5.h'>
<input type='hidden' name='id' value='238d1d0f79f619d75c2cc741d6770fb0986aef24'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/crypto?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>crypto</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>cast5.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='238d1d0f79f619d75c2cc741d6770fb0986aef24'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-30 09:32:26 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-30 09:32:26 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>238d1d0f79f619d75c2cc741d6770fb0986aef24</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>ed11bb89c3c61cba7aff3ebc90647f83758a982d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>include/crypto/cast5.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/cast5.h?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>f3de082c12e5e9ff43c58a7561f6ec3272d03a48</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24&amp;id2=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/cast5.h?id=36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75'>36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/cast5.h?id=238d1d0f79f619d75c2cc741d6770fb0986aef24&amp;id2=36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux</div><div class='commit-msg'>Pull documentation fixes from Jonathan Corbet:
 "Two small fixes:

   - A merge error on my part broke the DocBook build. I've
     requisitioned one of tglx's frozen sharks for appropriate
     disciplinary action and resolved to be more careful about testing
     the DocBook stuff as long as it's still around.

   - Fix an error in unaligned-memory-access.txt"

* tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux:
  Documentation/unaligned-memory-access.txt: fix incorrect comparison operator
  docs: Fix build failure
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>Diffstat</a> (limited to 'include/crypto/cast5.h')</div><table summary='diffstat' class='diffstat'>