[PATCH 03/12] s390: Add mapping helper functions.

[Cornelia Huck <cornelia.huck@xxxxxxxxxx>]

Add s390_cpu_physical_memory_{map,unmap} with special handling
for the lowcore.

Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
---
 target-s390x/cpu.h    |  4 ++++
 target-s390x/helper.c | 26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 6700fe9..cd729d3 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -299,6 +299,10 @@ int cpu_s390x_handle_mmu_fault (CPUS390XState *env, target_ulong address, int rw
 
 
 #ifndef CONFIG_USER_ONLY
+void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr len,
+                                   int is_write);
+void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
+                                    int is_write);
 void s390x_tod_timer(void *opaque);
 void s390x_cpu_timer(void *opaque);
 
diff --git a/target-s390x/helper.c b/target-s390x/helper.c
index bf2b4d3..d350f28 100644
--- a/target-s390x/helper.c
+++ b/target-s390x/helper.c
@@ -490,6 +490,32 @@ static void cpu_unmap_lowcore(LowCore *lowcore, hwaddr len)
     cpu_physical_memory_unmap(lowcore, len, 1, len);
 }
 
+void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr len,
+                                   int is_write)
+{
+    hwaddr start = addr;
+
+    /* Mind the prefix area. */
+    if (addr < 8192) {
+        start += env->psa;
+    } else if ((env->psa <= addr) && (addr < env->psa + 8192)) {
+        start -= env->psa;
+    }
+
+    if ((addr + len <= env->psa) || (addr >= env->psa + 8192)) {
+        return cpu_physical_memory_map(start, &len, is_write);
+    }
+
+    DPRINTF("mapping across lowcore boundaries not yet supported\n");
+    return NULL;
+}
+
+void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
+                                    int is_write)
+{
+    cpu_physical_memory_unmap(addr, len, is_write, len);
+}
+
 static void do_svc_interrupt(CPUS390XState *env)
 {
     uint64_t mask, addr;
-- 
1.7.12.4

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