target/sparc: sun4u Invert Endian TTE bit

This bit configures endianness of PCI MMIO devices. It is used by
Solaris and OpenBSD sunhme drivers.

Tested working on OpenBSD.

Unfortunately Solaris 10 had a unrelated keyboard issue blocking
testing... another inch towards Solaris 10 on SPARC64 =)
Signed-off-by: NTony Nguyen <tony.nguyen@bt.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Tested-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <3c8d5181a584f1b3712d3d8d66801b13cecb4b88.1566466906.git.tony.nguyen@bt.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

target/sparc/cpu.h

@@ -275,6 +275,7 @@ enum {
 
 #define TTE_VALID_BIT       (1ULL << 63)
 #define TTE_NFO_BIT         (1ULL << 60)
+#define TTE_IE_BIT          (1ULL << 59)
 #define TTE_USED_BIT        (1ULL << 41)
 #define TTE_LOCKED_BIT      (1ULL <<  6)
 #define TTE_SIDEEFFECT_BIT  (1ULL <<  3)
@@ -291,6 +292,7 @@ enum {
 
 #define TTE_IS_VALID(tte)   ((tte) & TTE_VALID_BIT)
 #define TTE_IS_NFO(tte)     ((tte) & TTE_NFO_BIT)
+#define TTE_IS_IE(tte)      ((tte) & TTE_IE_BIT)
 #define TTE_IS_USED(tte)    ((tte) & TTE_USED_BIT)
 #define TTE_IS_LOCKED(tte)  ((tte) & TTE_LOCKED_BIT)
 #define TTE_IS_SIDEEFFECT(tte) ((tte) & TTE_SIDEEFFECT_BIT)

target/sparc/mmu_helper.c

@@ -537,6 +537,10 @@ static int get_physical_address_data(CPUSPARCState *env, hwaddr *physical,
         if (ultrasparc_tag_match(&env->dtlb[i], address, context, physical)) {
             int do_fault = 0;
 
+            if (TTE_IS_IE(env->dtlb[i].tte)) {
+                attrs->byte_swap = true;
+            }
+
             /* access ok? */
             /* multiple bits in SFSR.FT may be set on TT_DFAULT */
             if (TTE_IS_PRIV(env->dtlb[i].tte) && is_user) {
@@ -792,7 +796,7 @@ void dump_mmu(CPUSPARCState *env)
             }
             if (TTE_IS_VALID(env->dtlb[i].tte)) {
                 qemu_printf("[%02u] VA: %" PRIx64 ", PA: %llx"
-                            ", %s, %s, %s, %s, ctx %" PRId64 " %s\n",
+                            ", %s, %s, %s, %s, ie %s, ctx %" PRId64 " %s\n",
                             i,
                             env->dtlb[i].tag & (uint64_t)~0x1fffULL,
                             TTE_PA(env->dtlb[i].tte),
@@ -801,6 +805,8 @@ void dump_mmu(CPUSPARCState *env)
                             TTE_IS_W_OK(env->dtlb[i].tte) ? "RW" : "RO",
                             TTE_IS_LOCKED(env->dtlb[i].tte) ?
                             "locked" : "unlocked",
+                            TTE_IS_IE(env->dtlb[i].tte) ?
+                            "yes" : "no",
                             env->dtlb[i].tag & (uint64_t)0x1fffULL,
                             TTE_IS_GLOBAL(env->dtlb[i].tte) ?
                             "global" : "local");