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s390x/helper: Fixed real-to-absolute address translation

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The real-to-absolute address translation in mmu_translate() was
missing the second part for translating the page at the prefix
address back to the 0 page. And while we're at it, also moved the
code into a separate helper function since this might come in
handy for other parts of the code, too.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Thomas Huth 2013-09-03 13:31:36 +02:00 committed by Cornelia Huck
parent 9898370497
commit 422f32c5b1
1 changed files with 15 additions and 3 deletions
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18
target-s390x/helper.c
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@ -170,6 +170,20 @@ static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr,
trigger_pgm_exception(env, type, ilen);
}
/**
* Translate real address to absolute (= physical)
* address by taking care of the prefix mapping.
*/
static target_ulong mmu_real2abs(CPUS390XState *env, target_ulong raddr)
{
if (raddr < 0x2000) {
return raddr + env->psa; /* Map the lowcore. */
} else if (raddr >= env->psa && raddr < env->psa + 0x2000) {
return raddr - env->psa; /* Map the 0 page. */
}
return raddr;
}
static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
uint64_t asc, uint64_t asce, int level,
target_ulong *raddr, int *flags, int rw)
@ -363,9 +377,7 @@ int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
out:
/* Convert real address -> absolute address */
if (*raddr < 0x2000) {
*raddr = *raddr + env->psa;
}
*raddr = mmu_real2abs(env, *raddr);
if (*raddr <= ram_size) {
sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE];