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/*
* arch/s390/mm/page-states.c
*
* Copyright IBM Corp. 2008
*
* Guest page hinting for unused pages.
*
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/init.h>
#define ESSA_SET_STABLE 1
#define ESSA_SET_UNUSED 2
static int cmma_flag;
static int __init cmma(char *str)
{
char *parm;
parm = strstrip(str);
if (strcmp(parm, "yes") == 0 || strcmp(parm, "on") == 0) {
cmma_flag = 1;
return 1;
}
cmma_flag = 0;
if (strcmp(parm, "no") == 0 || strcmp(parm, "off") == 0)
return 1;
return 0;
}
__setup("cmma=", cmma);
void __init cmma_init(void)
{
register unsigned long tmp asm("0") = 0;
register int rc asm("1") = -EOPNOTSUPP;
if (!cmma_flag)
return;
asm volatile(
" .insn rrf,0xb9ab0000,%1,%1,0,0\n"
"0: la %0,0\n"
"1:\n"
EX_TABLE(0b,1b)
: "+&d" (rc), "+&d" (tmp));
if (rc)
cmma_flag = 0;
}
void arch_free_page(struct page *page, int order)
{
int i, rc;
if (!cmma_flag)
return;
for (i = 0; i < (1 << order); i++)
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
: "=&d" (rc)
: "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
"i" (ESSA_SET_UNUSED));
}
void arch_alloc_page(struct page *page, int order)
{
int i, rc;
if (!cmma_flag)
return;
for (i = 0; i < (1 << order); i++)
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
: "=&d" (rc)
: "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
"i" (ESSA_SET_STABLE));
}
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