Replace is_user variable with mmu_idx in softmmu core,

allowing support of more than 2 mmu access modes.
Add backward compatibility is_user variable in targets code when needed.
Implement per target cpu_mmu_index function, avoiding duplicated code
  and #ifdef TARGET_xxx in softmmu core functions.
Implement per target mmu modes definitions. As an example, add PowerPC
  hypervisor mode definition and Alpha executive and kernel modes definitions.
Optimize PowerPC case, precomputing mmu_idx when MSR register changes
  and using the same definition in code translation code.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3384 c046a42c-6fe2-441c-8c8c-71466251a162

target-arm/cpu.h

@@ -43,6 +43,8 @@ typedef void ARMWriteCPFunc(void *opaque, int cp_info,
 typedef uint32_t ARMReadCPFunc(void *opaque, int cp_info,
                                int dstreg, int operand);
 
+#define NB_MMU_MODES 2
+
 /* We currently assume float and double are IEEE single and double
    precision respectively.
    Doing runtime conversions is tricky because VFP registers may contain
@@ -301,6 +303,15 @@ void cpu_arm_set_cp_io(CPUARMState *env, int cpnum,
 #define cpu_signal_handler cpu_arm_signal_handler
 #define cpu_list arm_cpu_list
 
+/* MMU modes definitions */
+#define MMU_MODE0_SUFFIX _kernel
+#define MMU_MODE1_SUFFIX _user
+#define MMU_USER_IDX 1
+static inline int cpu_mmu_index (CPUState *env)
+{
+    return (env->uncached_cpsr & CPSR_M) == ARM_CPU_MODE_USR ? 1 : 0;
+}
+
 #include "cpu-all.h"
 
 #endif