From 607b4b0876bd3b1f33786ecc010ca2723de57270 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 3 Feb 2011 19:43:23 +0000 Subject: [PATCH] target-arm: Clean up handling of MPIDR The ARM cp15 register 0,c0,c0,5 is standardised in the v7 architecture as the MPIDR. Clean up its implementation to remove A9 specific handling. This commit includes fixing an error in the value returned for the MPIDR on A9, where we were erroneously claiming a cluster ID of 9. Signed-off-by: Peter Maydell Signed-off-by: Aurelien Jarno --- target-arm/helper.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 3cf91818b9..d46defc118 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -1608,12 +1608,28 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn) return 0; case 3: /* TLB type register. */ return 0; /* No lockable TLB entries. */ - case 5: /* CPU ID */ - if (ARM_CPUID(env) == ARM_CPUID_CORTEXA9) { - return env->cpu_index | 0x80000900; - } else { - return env->cpu_index; + case 5: /* MPIDR */ + /* The MPIDR was standardised in v7; prior to + * this it was implemented only in the 11MPCore. + * For all other pre-v7 cores it does not exist. + */ + if (arm_feature(env, ARM_FEATURE_V7) || + ARM_CPUID(env) == ARM_CPUID_ARM11MPCORE) { + int mpidr = env->cpu_index; + /* We don't support setting cluster ID ([8..11]) + * so these bits always RAZ. + */ + if (arm_feature(env, ARM_FEATURE_V7MP)) { + mpidr |= (1 << 31); + /* Cores which are uniprocessor (non-coherent) + * but still implement the MP extensions set + * bit 30. (For instance, A9UP.) However we do + * not currently model any of those cores. + */ + } + return mpidr; } + /* otherwise fall through to the unimplemented-reg case */ default: goto bad_reg; }