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target/s390x: remove some Linux assumptions from IPTE 

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Message-Id: <20170531220129.27724-3-aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Aurelien Jarno 2017-06-01 00:01:01 +02:00 committed by Richard Henderson
parent 51a718bf3d
commit 8a4719f527
3 changed files with 12 additions and 9 deletions
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2
target/s390x/cpu.h
View File

@ -1035,6 +1035,8 @@ struct sysib_322 {
#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
#define VADDR_PX 0xff000 /* page index bits */
#define _PAGE_RO 0x200 /* HW read-only bit */
#define _PAGE_INVALID 0x400 /* HW invalid bit */
#define _PAGE_RES0 0x800 /* bit must be zero */

17
target/s390x/mem_helper.c
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@ -1073,19 +1073,22 @@ uint32_t HELPER(mvcp)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
}
/* invalidate pte */
void HELPER(ipte)(CPUS390XState *env, uint64_t pte_addr, uint64_t vaddr)
void HELPER(ipte)(CPUS390XState *env, uint64_t pto, uint64_t vaddr)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
uint64_t page = vaddr & TARGET_PAGE_MASK;
uint64_t pte = 0;
uint64_t pte_addr, pte;
/* XXX broadcast to other CPUs */
/* XXX Linux is nice enough to give us the exact pte address.
According to spec we'd have to find it out ourselves */
/* XXX Linux is fine with overwriting the pte, the spec requires
us to only set the invalid bit */
stq_phys(cs->as, pte_addr, pte | _PAGE_INVALID);
/* Compute the page table entry address */
pte_addr = (pto & _SEGMENT_ENTRY_ORIGIN);
pte_addr += (vaddr & _VADDR_PX) >> 9;
/* Mark the page table entry as invalid */
pte = ldq_phys(cs->as, pte_addr);
pte |= _PAGE_INVALID;
stq_phys(cs->as, pte_addr, pte);
/* XXX we exploit the fact that Linux passes the exact virtual
address here - it's not obliged to! */

2
target/s390x/mmu_helper.c
View File

@ -143,8 +143,6 @@ static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr,
return 0;
}
#define VADDR_PX 0xff000 /* Page index bits */
/* Decode segment table entry */
static int mmu_translate_segment(CPUS390XState *env, target_ulong vaddr,
uint64_t asc, uint64_t st_entry,