[Qemu-devel] [PATCH 05/10] PPC: Properly emulate L1CSR0 and L1CSR1

[Alexander Graf <agraf@suse.de>]

There are 2 L1 cache control registers - one for data (L1CSR0) and
one for instructions (L1CSR1).

Emulate both of them well enough to give the guest the illusion that
it could actually do anything about its caches.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 target-ppc/cpu.h            | 12 ++++++++++++
 target-ppc/translate_init.c | 14 +++++++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 15abad4..30b328d 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1708,6 +1708,18 @@ static inline int cpu_mmu_index (CPUPPCState *env)
 /* External Input Interrupt Directed to Guest State */
 #define EPCR_EXTGS            (1 << 31)
 
+#define   L1CSR0_CPE		0x00010000	/* Data Cache Parity Enable */
+#define   L1CSR0_CUL		0x00000400	/* (D-)Cache Unable to Lock */
+#define   L1CSR0_DCLFR		0x00000100	/* D-Cache Lock Flash Reset */
+#define   L1CSR0_DCFI		0x00000002	/* Data Cache Flash Invalidate */
+#define   L1CSR0_DCE		0x00000001	/* Data Cache Enable */
+
+#define   L1CSR1_CPE		0x00010000	/* Instruction Cache Parity Enable */
+#define   L1CSR1_ICUL		0x00000400	/* I-Cache Unable to Lock */
+#define   L1CSR1_ICLFR		0x00000100	/* I-Cache Lock Flash Reset */
+#define   L1CSR1_ICFI		0x00000002	/* Instruction Cache Flash Invalidate */
+#define   L1CSR1_ICE		0x00000001	/* Instruction Cache Enable */
+
 /*****************************************************************************/
 /* PowerPC Instructions types definitions                                    */
 enum {
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 403ce7a..7322116 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -1448,7 +1448,16 @@ static void spr_write_e500_l1csr0 (void *opaque, int sprn, int gprn)
 {
     TCGv t0 = tcg_temp_new();
 
-    tcg_gen_andi_tl(t0, cpu_gpr[gprn], ~256);
+    tcg_gen_andi_tl(t0, cpu_gpr[gprn], L1CSR0_DCE | L1CSR0_CPE);
+    gen_store_spr(sprn, t0);
+    tcg_temp_free(t0);
+}
+
+static void spr_write_e500_l1csr1(void *opaque, int sprn, int gprn)
+{
+    TCGv t0 = tcg_temp_new();
+
+    tcg_gen_andi_tl(t0, cpu_gpr[gprn], L1CSR1_ICE | L1CSR1_CPE);
     gen_store_spr(sprn, t0);
     tcg_temp_free(t0);
 }
@@ -4566,10 +4575,9 @@ static void init_proc_e500 (CPUPPCState *env, int version)
                  SPR_NOACCESS, SPR_NOACCESS,
                  &spr_read_generic, &spr_write_e500_l1csr0,
                  0x00000000);
-    /* XXX : not implemented */
     spr_register(env, SPR_Exxx_L1CSR1, "L1CSR1",
                  SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
+                 &spr_read_generic, &spr_write_e500_l1csr1,
                  0x00000000);
     spr_register(env, SPR_BOOKE_MCSRR0, "MCSRR0",
                  SPR_NOACCESS, SPR_NOACCESS,
-- 
1.8.1.4