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>
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/*
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* Implementation of s390 diagnose codes
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*
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* Copyright IBM Corp. 2007
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* Author(s): Michael Holzheu <holzheu@de.ibm.com>
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*/
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#include <linux/module.h>
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#include <asm/diag.h>
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/*
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* Diagnose 14: Input spool file manipulation
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*/
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int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
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{
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register unsigned long _ry1 asm("2") = ry1;
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register unsigned long _ry2 asm("3") = subcode;
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int rc = 0;
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asm volatile(
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#ifdef CONFIG_64BIT
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" sam31\n"
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" diag %2,2,0x14\n"
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" sam64\n"
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#else
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" diag %2,2,0x14\n"
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#endif
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (rc), "+d" (_ry2)
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: "d" (rx), "d" (_ry1)
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: "cc");
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return rc;
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}
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EXPORT_SYMBOL(diag14);
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/*
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* Diagnose 210: Get information about a virtual device
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*/
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int diag210(struct diag210 *addr)
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{
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/*
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* diag 210 needs its data below the 2GB border, so we
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* use a static data area to be sure
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*/
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static struct diag210 diag210_tmp;
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static DEFINE_SPINLOCK(diag210_lock);
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unsigned long flags;
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int ccode;
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spin_lock_irqsave(&diag210_lock, flags);
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diag210_tmp = *addr;
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#ifdef CONFIG_64BIT
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asm volatile(
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" lhi %0,-1\n"
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" sam31\n"
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" diag %1,0,0x210\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1: sam64\n"
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EX_TABLE(0b, 1b)
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: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
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#else
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asm volatile(
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" lhi %0,-1\n"
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" diag %1,0,0x210\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b, 1b)
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: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
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#endif
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*addr = diag210_tmp;
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spin_unlock_irqrestore(&diag210_lock, flags);
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return ccode;
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}
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EXPORT_SYMBOL(diag210);
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