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[S390] replace diag10() with diag10_range() function

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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>
This commit is contained in:
Michael Holzheu
2011-05-10 17:13:41 +02:00
committed by Martin Schwidefsky
parent 91d378088b
commit 83ace2701b
3 changed files with 16 additions and 24 deletions
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17
arch/s390/include/asm/diag.h
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@@ -9,9 +9,22 @@
#define _ASM_S390_DIAG_H
/*
* Diagnose 10: Release pages
* Diagnose 10: Release page range
*/
extern void diag10(unsigned long addr);
static inline void diag10_range(unsigned long start_pfn, unsigned long num_pfn)
{
unsigned long start_addr, end_addr;
start_addr = start_pfn << PAGE_SHIFT;
end_addr = (start_pfn + num_pfn - 1) << PAGE_SHIFT;
asm volatile(
"0: diag %0,%1,0x10\n"
"1:\n"
EX_TABLE(0b, 1b)
EX_TABLE(1b, 1b)
: : "a" (start_addr), "a" (end_addr));
}
/*
* Diagnose 14: Input spool file manipulation