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s390x/helper: Added format control bit to MMU translation 

With the EDAT-1 facility, the MMU translation can stop at the
segment table already, pointing to a 1 MB block. And while we're
at it, move the page table entry handling to a separate function,
too, as suggested by Alexander Graf.

Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Thomas Huth 2014-04-25 15:37:19 +02:00 committed by Cornelia Huck
parent 422f32c5b1
commit c4400206d4
2 changed files with 56 additions and 18 deletions
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4
target-s390x/cpu.h
View File

@ -270,6 +270,9 @@ typedef struct CPUS390XState {
#define FLAG_MASK_64 (PSW_MASK_64 >> 32)
#define FLAG_MASK_32 0x00001000
/* Control register 0 bits */
#define CR0_EDAT 0x0000000000800000ULL
static inline int cpu_mmu_index (CPUS390XState *env)
{
if (env->psw.mask & PSW_MASK_PSTATE) {
@ -927,6 +930,7 @@ struct sysib_322 {
#define _REGION_ENTRY_LENGTH 0x03 /* region third length */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffULL /* segment table origin */
#define _SEGMENT_ENTRY_FC 0x400 /* format control */
#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */

70
target-s390x/helper.c
View File

@ -184,6 +184,50 @@ static target_ulong mmu_real2abs(CPUS390XState *env, target_ulong raddr)
return raddr;
}
/* Decode page table entry (normal 4KB page) */
static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr,
uint64_t asc, uint64_t asce,
target_ulong *raddr, int *flags, int rw)
{
if (asce & _PAGE_INVALID) {
DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, asce);
trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
return -1;
}
if (asce & _PAGE_RO) {
*flags &= ~PAGE_WRITE;
}
*raddr = asce & _ASCE_ORIGIN;
PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, asce);
return 0;
}
/* Decode EDAT1 segment frame absolute address (1MB page) */
static int mmu_translate_sfaa(CPUS390XState *env, target_ulong vaddr,
uint64_t asc, uint64_t asce, target_ulong *raddr,
int *flags, int rw)
{
if (asce & _SEGMENT_ENTRY_INV) {
DPRINTF("%s: SEG=0x%" PRIx64 " invalid\n", __func__, asce);
trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
return -1;
}
if (asce & _SEGMENT_ENTRY_RO) {
*flags &= ~PAGE_WRITE;
}
*raddr = (asce & 0xfffffffffff00000ULL) | (vaddr & 0xfffff);
PTE_DPRINTF("%s: SEG=0x%" PRIx64 "\n", __func__, asce);
return 0;
}
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)
@ -243,28 +287,18 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n",
__func__, origin, offs, new_asce);
if (level != _ASCE_TYPE_SEGMENT) {
if (level == _ASCE_TYPE_SEGMENT) {
/* 4KB page */
return mmu_translate_pte(env, vaddr, asc, new_asce, raddr, flags, rw);
} else if (level - 4 == _ASCE_TYPE_SEGMENT &&
(new_asce & _SEGMENT_ENTRY_FC) && (env->cregs[0] & CR0_EDAT)) {
/* 1MB page */
return mmu_translate_sfaa(env, vaddr, asc, new_asce, raddr, flags, rw);
} else {
/* yet another region */
return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr,
flags, rw);
}
/* PTE */
if (new_asce & _PAGE_INVALID) {
DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, new_asce);
trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
return -1;
}
if (new_asce & _PAGE_RO) {
*flags &= ~PAGE_WRITE;
}
*raddr = new_asce & _ASCE_ORIGIN;
PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, new_asce);
return 0;
}
static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr,