83ace2701b
Currently the diag10() function can only release one page. For exploiters that have to call diag10 on a contiguous memory region this is suboptimal. This patch replaces the diag10() function with diag10_range() that is able to release multiple pages. In addition to that the new function now allows to release memory with addresses higher than 2047 MiB. This was due to a restriction of the diagnose implementation under z/VM prior to release 5.2. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
/*
|
|
* Implementation of s390 diagnose codes
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Author(s): Michael Holzheu <holzheu@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <asm/diag.h>
|
|
|
|
/*
|
|
* Diagnose 14: Input spool file manipulation
|
|
*/
|
|
int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
|
|
{
|
|
register unsigned long _ry1 asm("2") = ry1;
|
|
register unsigned long _ry2 asm("3") = subcode;
|
|
int rc = 0;
|
|
|
|
asm volatile(
|
|
#ifdef CONFIG_64BIT
|
|
" sam31\n"
|
|
" diag %2,2,0x14\n"
|
|
" sam64\n"
|
|
#else
|
|
" diag %2,2,0x14\n"
|
|
#endif
|
|
" ipm %0\n"
|
|
" srl %0,28\n"
|
|
: "=d" (rc), "+d" (_ry2)
|
|
: "d" (rx), "d" (_ry1)
|
|
: "cc");
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(diag14);
|
|
|
|
/*
|
|
* Diagnose 210: Get information about a virtual device
|
|
*/
|
|
int diag210(struct diag210 *addr)
|
|
{
|
|
/*
|
|
* diag 210 needs its data below the 2GB border, so we
|
|
* use a static data area to be sure
|
|
*/
|
|
static struct diag210 diag210_tmp;
|
|
static DEFINE_SPINLOCK(diag210_lock);
|
|
unsigned long flags;
|
|
int ccode;
|
|
|
|
spin_lock_irqsave(&diag210_lock, flags);
|
|
diag210_tmp = *addr;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
asm volatile(
|
|
" lhi %0,-1\n"
|
|
" sam31\n"
|
|
" diag %1,0,0x210\n"
|
|
"0: ipm %0\n"
|
|
" srl %0,28\n"
|
|
"1: sam64\n"
|
|
EX_TABLE(0b, 1b)
|
|
: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
|
|
#else
|
|
asm volatile(
|
|
" lhi %0,-1\n"
|
|
" diag %1,0,0x210\n"
|
|
"0: ipm %0\n"
|
|
" srl %0,28\n"
|
|
"1:\n"
|
|
EX_TABLE(0b, 1b)
|
|
: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
|
|
#endif
|
|
|
|
*addr = diag210_tmp;
|
|
spin_unlock_irqrestore(&diag210_lock, flags);
|
|
|
|
return ccode;
|
|
}
|
|
EXPORT_SYMBOL(diag210);
|