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s390x/tcg: add MMU for real addresses

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This makes it easy to access real addresses (prefix) and in addition
checks for valid memory addresses, which is missing when using e.g.
stl_phys().

We can later reuse it to implement low address protection checks (then
we might even decide to introduce yet another MMU for absolute
addresses, just for handling storage keys and low address protection).

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170926183318.12995-3-david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2017-09-26 20:33:14 +02:00 • committed by Cornelia Huck
parent 0bd695a960
commit fb66944df9
4 changed files with 40 additions and 10 deletions
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4
target/s390x/cpu.h
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@ -43,12 +43,13 @@
#include "fpu/softfloat.h"
#define NB_MMU_MODES 3
#define NB_MMU_MODES 4
#define TARGET_INSN_START_EXTRA_WORDS 1
#define MMU_MODE0_SUFFIX _primary
#define MMU_MODE1_SUFFIX _secondary
#define MMU_MODE2_SUFFIX _home
#define MMU_MODE3_SUFFIX _real
#define MMU_USER_IDX 0
@ -351,6 +352,7 @@ extern const struct VMStateDescription vmstate_s390_cpu;
#define MMU_PRIMARY_IDX 0
#define MMU_SECONDARY_IDX 1
#define MMU_HOME_IDX 2
#define MMU_REAL_IDX 3
static inline int cpu_mmu_index(CPUS390XState *env, bool ifetch)
{