target/ppc: Add HASHKEYR and HASHPKEYR SPRs

Add the Special Purpose Registers HASHKEYR and HASHPKEYR, which were
introduced by the Power ISA 3.1B. They are used by the new instructions
hashchk(p) and hashst(p).

The ISA states that the Operating System should generate the value for
these registers when creating a process, so it's its responsability to
do so. We initialize it with 0 for qemu-softmmu, and set a random 64
bits value for linux-user.

Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Reviewed-by: Lucas Mateus Castro <lucas.araujo@eldorado.org.br>
Message-Id: <20220715205439.161110-2-victor.colombo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index a4c893cfadbb75a2c1600259a6de5479e37a505c..4551d81b5faf110c4c62766b92ed15332e9e28f0 100644 (file)
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1676,6 +1676,8 @@ void ppc_compat_add_property(Object *obj, const char *name,
 #define SPR_BOOKE_GIVOR14     (0x1BD)
 #define SPR_TIR               (0x1BE)
 #define SPR_PTCR              (0x1D0)
+#define SPR_HASHKEYR          (0x1D4)
+#define SPR_HASHPKEYR         (0x1D5)
 #define SPR_BOOKE_SPEFSCR     (0x200)
 #define SPR_Exxx_BBEAR        (0x201)
 #define SPR_Exxx_BBTAR        (0x202)

diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 899c4a586e690a1f7c7c42903bc8409b8407af76..6e080ebda02d932797afb72a36c6f088c48fd217 100644 (file)
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -5700,6 +5700,33 @@ static void register_power9_mmu_sprs(CPUPPCState *env)
 #endif
 }
 
+static void register_power10_hash_sprs(CPUPPCState *env)
+{
+    /*
+     * it's the OS responsability to generate a random value for the registers
+     * in each process' context. So, initialize it with 0 here.
+     */
+    uint64_t hashkeyr_initial_value = 0, hashpkeyr_initial_value = 0;
+#if defined(CONFIG_USER_ONLY)
+    /* in linux-user, setup the hash register with a random value */
+    GRand *rand = g_rand_new();
+    hashkeyr_initial_value =
+        ((uint64_t)g_rand_int(rand) << 32) | (uint64_t)g_rand_int(rand);
+    hashpkeyr_initial_value =
+        ((uint64_t)g_rand_int(rand) << 32) | (uint64_t)g_rand_int(rand);
+    g_rand_free(rand);
+#endif
+    spr_register(env, SPR_HASHKEYR, "HASHKEYR",
+            SPR_NOACCESS, SPR_NOACCESS,
+            &spr_read_generic, &spr_write_generic,
+            hashkeyr_initial_value);
+    spr_register_hv(env, SPR_HASHPKEYR, "HASHPKEYR",
+            SPR_NOACCESS, SPR_NOACCESS,
+            SPR_NOACCESS, SPR_NOACCESS,
+            &spr_read_generic, &spr_write_generic,
+            hashpkeyr_initial_value);
+}
+
 /*
  * Initialize PMU counter overflow timers for Power8 and
  * newer Power chips when using TCG.
@@ -6518,6 +6545,7 @@ static void init_proc_POWER10(CPUPPCState *env)
     register_power8_book4_sprs(env);
     register_power8_rpr_sprs(env);
     register_power9_mmu_sprs(env);
+    register_power10_hash_sprs(env);
 
     /* FIXME: Filter fields properly based on privilege level */
     spr_register_kvm_hv(env, SPR_PSSCR, "PSSCR", NULL, NULL, NULL, NULL,