* [Qemu-devel] [PATCH 1/2] Add dummy implementation of generic timer cp15 registers
2012-01-25 13:32 [Qemu-devel] [PATCH 0/2] Cortex-A15 support: target-arm patches Peter Maydell
@ 2012-01-25 13:32 ` Peter Maydell
2012-01-25 14:01 ` Andreas Färber
2012-01-25 13:32 ` [Qemu-devel] [PATCH 2/2] Add Cortex-A15 CPU definition Peter Maydell
1 sibling, 1 reply; 5+ messages in thread
From: Peter Maydell @ 2012-01-25 13:32 UTC (permalink / raw)
To: qemu-devel; +Cc: Andreas Färber, patches
Add a dummy implementation of the cp15 registers for the generic
timer (found in the Cortex-A15), just sufficient for Linux to
decide that it can't use it. This requires at least CNTP_CTL and
CNTFRQ to be implemented as RAZ/WI; we RAZ/WI all of c14.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target-arm/cpu.h | 1 +
target-arm/helper.c | 12 ++++++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 42c53a7..7442c99 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -382,6 +382,7 @@ enum arm_features {
ARM_FEATURE_VAPA, /* cp15 VA to PA lookups */
ARM_FEATURE_ARM_DIV, /* divide supported in ARM encoding */
ARM_FEATURE_VFP4, /* VFPv4 (implies that NEON is v2) */
+ ARM_FEATURE_GENERIC_TIMER,
};
static inline int arm_feature(CPUARMState *env, int feature)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 22e40fc..5e7205a 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1764,7 +1764,11 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
goto bad_reg;
}
break;
- case 14: /* Reserved. */
+ case 14: /* Generic timer */
+ if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) {
+ /* Dummy implementation: RAZ/WI for all */
+ break;
+ }
goto bad_reg;
case 15: /* Implementation specific. */
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
@@ -2134,7 +2138,11 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
default:
goto bad_reg;
}
- case 14: /* Reserved. */
+ case 14: /* Generic timer */
+ if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) {
+ /* Dummy implementation: RAZ/WI for all */
+ return 0;
+ }
goto bad_reg;
case 15: /* Implementation specific. */
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
--
1.7.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [Qemu-devel] [PATCH 2/2] Add Cortex-A15 CPU definition
2012-01-25 13:32 [Qemu-devel] [PATCH 0/2] Cortex-A15 support: target-arm patches Peter Maydell
2012-01-25 13:32 ` [Qemu-devel] [PATCH 1/2] Add dummy implementation of generic timer cp15 registers Peter Maydell
@ 2012-01-25 13:32 ` Peter Maydell
1 sibling, 0 replies; 5+ messages in thread
From: Peter Maydell @ 2012-01-25 13:32 UTC (permalink / raw)
To: qemu-devel; +Cc: Andreas Färber, patches
Add a definition of a Cortex-A15 CPU. Note that for the moment we do
not implement any of:
* Large Physical Address Extensions (LPAE)
* Virtualization Extensions
* Generic Timer
* TrustZone (this is also true of our existing Cortex-A9 model, etc)
This CPU model is sufficient to boot a Linux kernel which has been
compiled for an A15 without LPAE enabled.
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target-arm/cpu.h | 1 +
target-arm/helper.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 7442c99..0d9b39c 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -433,6 +433,7 @@ void cpu_arm_set_cp_io(CPUARMState *env, int cpnum,
#define ARM_CPUID_ARM11MPCORE 0x410fb022
#define ARM_CPUID_CORTEXA8 0x410fc080
#define ARM_CPUID_CORTEXA9 0x410fc090
+#define ARM_CPUID_CORTEXA15 0x412fc0f1
#define ARM_CPUID_CORTEXM3 0x410fc231
#define ARM_CPUID_ANY 0xffffffff
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 5e7205a..ea4f35f 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -10,6 +10,16 @@
#if !defined(CONFIG_USER_ONLY)
#include "hw/loader.h"
#endif
+#include "sysemu.h"
+
+static uint32_t cortexa15_cp15_c0_c1[8] = {
+ 0x00001131, 0x00011011, 0x02010555, 0x00000000,
+ 0x10201105, 0x20000000, 0x01240000, 0x02102211
+};
+
+static uint32_t cortexa15_cp15_c0_c2[8] = {
+ 0x02101110, 0x13112111, 0x21232041, 0x11112131, 0x10011142, 0, 0, 0
+};
static uint32_t cortexa9_cp15_c0_c1[8] =
{ 0x1031, 0x11, 0x000, 0, 0x00100103, 0x20000000, 0x01230000, 0x00002111 };
@@ -158,6 +168,27 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
env->cp15.c0_ccsid[1] = 0x200fe015; /* 16k L1 icache. */
env->cp15.c1_sys = 0x00c50078;
break;
+ case ARM_CPUID_CORTEXA15:
+ set_feature(env, ARM_FEATURE_V7);
+ set_feature(env, ARM_FEATURE_VFP4);
+ set_feature(env, ARM_FEATURE_VFP_FP16);
+ set_feature(env, ARM_FEATURE_NEON);
+ set_feature(env, ARM_FEATURE_THUMB2EE);
+ set_feature(env, ARM_FEATURE_ARM_DIV);
+ set_feature(env, ARM_FEATURE_V7MP);
+ set_feature(env, ARM_FEATURE_GENERIC_TIMER);
+ env->vfp.xregs[ARM_VFP_FPSID] = 0x410430f0;
+ env->vfp.xregs[ARM_VFP_MVFR0] = 0x10110222;
+ env->vfp.xregs[ARM_VFP_MVFR1] = 0x11111111;
+ memcpy(env->cp15.c0_c1, cortexa15_cp15_c0_c1, 8 * sizeof(uint32_t));
+ memcpy(env->cp15.c0_c2, cortexa15_cp15_c0_c2, 8 * sizeof(uint32_t));
+ env->cp15.c0_cachetype = 0x8444c004;
+ env->cp15.c0_clid = 0x0a200023;
+ env->cp15.c0_ccsid[0] = 0x701fe00a; /* 32K L1 dcache */
+ env->cp15.c0_ccsid[1] = 0x201fe00a; /* 32K L1 icache */
+ env->cp15.c0_ccsid[2] = 0x711fe07a; /* 4096K L2 unified cache */
+ env->cp15.c1_sys = 0x00c50078;
+ break;
case ARM_CPUID_CORTEXM3:
set_feature(env, ARM_FEATURE_V7);
set_feature(env, ARM_FEATURE_M);
@@ -416,6 +447,7 @@ static const struct arm_cpu_t arm_cpu_names[] = {
{ ARM_CPUID_CORTEXM3, "cortex-m3"},
{ ARM_CPUID_CORTEXA8, "cortex-a8"},
{ ARM_CPUID_CORTEXA9, "cortex-a9"},
+ { ARM_CPUID_CORTEXA15, "cortex-a15" },
{ ARM_CPUID_TI925T, "ti925t" },
{ ARM_CPUID_PXA250, "pxa250" },
{ ARM_CPUID_SA1100, "sa1100" },
@@ -670,8 +702,6 @@ uint32_t HELPER(get_r13_banked)(CPUState *env, uint32_t mode)
#else
-extern int semihosting_enabled;
-
/* Map CPU modes onto saved register banks. */
static inline int bank_number(CPUState *env, int mode)
{
@@ -1945,6 +1975,7 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
case ARM_CPUID_CORTEXA8:
return 2;
case ARM_CPUID_CORTEXA9:
+ case ARM_CPUID_CORTEXA15:
return 0;
default:
goto bad_reg;
@@ -2065,11 +2096,26 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
goto bad_reg;
}
case 1: /* L2 cache */
- if (crm != 0) {
+ /* L2 Lockdown and Auxiliary control. */
+ switch (op2) {
+ case 0:
+ /* L2 cache lockdown (A8 only) */
+ return 0;
+ case 2:
+ /* L2 cache auxiliary control (A8) or control (A15) */
+ if (ARM_CPUID(env) == ARM_CPUID_CORTEXA15) {
+ /* Linux wants the number of processors from here.
+ * Might as well set the interrupt-controller bit too.
+ */
+ return ((smp_cpus - 1) << 24) | (1 << 23);
+ }
+ return 0;
+ case 3:
+ /* L2 cache extended control (A15) */
+ return 0;
+ default:
goto bad_reg;
}
- /* L2 Lockdown and Auxiliary control. */
- return 0;
default:
goto bad_reg;
}
--
1.7.1
^ permalink raw reply related [flat|nested] 5+ messages in thread