[Qemu-devel] [RFC v2 2/2] target-arm: Add support for Cortex-R4F

[Andreas Färber]

With QOM ARMCPU we can now distinguish between -cpu cortex-r4 and
-cpu cortex-r4f despite identical MIDR.

Signed-off-by: Andreas Färber <address@hidden>
---
 target-arm/cpu.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 Datei geändert, 47 Zeilen hinzugefügt(+)

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 6726498..e176559 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -405,6 +405,52 @@ static void cortex_r4_initfn(Object *obj)
     cpu->id_isar5 = 0x0;
 }
 
+static const struct {
+    uint8_t r;
+    uint8_t p;
+    uint8_t value;
+} cortexr4_fpsid_revs[] = {
+    { 1, 0, 0x3 },
+    { 1, 1, 0x4 },
+    { 1, 2, 0x6 },
+    { 1, 3, 0x7 },
+    { 1, 4, 0x8 },
+    {}
+};
+
+static void cortex_r4f_initfn(Object *obj)
+{
+    ARMCPU *cpu = ARM_CPU(obj);
+
+    /* Cortex-R4F = Cortex-R4 + FPU */
+    cortex_r4_initfn(obj);
+
+    set_feature(&cpu->env, ARM_FEATURE_VFP3);
+    /* TODO VFPv3-D16 */
+    {
+        /* PMM didn't like this dynamic revision lookup... */
+        /* TODO: maybe weave cross-checks into QOM properties instead? */
+        uint8_t r = (cpu->midr >> 20) & 0xf;
+        uint8_t p = cpu->midr & 0xf;
+        uint8_t rev = 0;
+        int i;
+        /* Calculate FPSID value matching to MIDR */
+        for (i = 0; cortexr4_fpsid_revs[i].r != 0; i++) {
+            if (cortexr4_fpsid_revs[i].r == r &&
+                cortexr4_fpsid_revs[i].p == p) {
+                rev = cortexr4_fpsid_revs[i].value;
+                break;
+            }
+        }
+        if (rev == 0) {
+            cpu_abort(&cpu->env,
+                      "Cortex-R4F r%" PRIu8 "p%" PRIu8 " unsupported",
+                      r, p);
+        }
+        cpu->reset_fpsid = 0x41023140 | (rev & 0xf);
+    }
+}
+
 static const ARMCPRegInfo cortexa8_cp_reginfo[] = {
     { .name = "L2LOCKDOWN", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 0,
       .access = PL1_RW, .type = ARM_CP_CONST, .resetvalue = 0 },
@@ -761,6 +807,7 @@ static const ARMCPUInfo arm_cpus[] = {
     { .name = "arm11mpcore", .initfn = arm11mpcore_initfn },
     { .name = "cortex-m3",   .initfn = cortex_m3_initfn },
     { .name = "cortex-r4",   .initfn = cortex_r4_initfn },
+    { .name = "cortex-r4f",  .initfn = cortex_r4f_initfn },
     { .name = "cortex-a8",   .initfn = cortex_a8_initfn },
     { .name = "cortex-a9",   .initfn = cortex_a9_initfn },
     { .name = "cortex-a15",  .initfn = cortex_a15_initfn },
-- 
1.7.10.4