FVP: change the method for translating MPIDR values to a linear indices
x3 will be assigned by the folloing instructions. So the first instruction is not needed any more. old method: (ClusterId * FVP_MAX_CPUS_PER_CLUSTER) + (CPUId * FVP_MAX_PE_PER_CPU) + ThreadId it should be (ClusterId * FVP_MAX_CPUS_PER_CLUSTER) * FVP_MAX_PE_PER_CPU + (CPUId * FVP_MAX_PE_PER_CPU) + ThreadId which can be simplified as: (ClusterId * FVP_MAX_CPUS_PER_CLUSTER + CPUId) * FVP_MAX_PE_PER_CPU + ThreadId Signed-off-by: Wang Feng <feng_feng.wang@spreadtrum.com>
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@ -178,19 +178,22 @@ func plat_is_my_cpu_primary
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ret
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endfunc plat_is_my_cpu_primary
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/* -----------------------------------------------------
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/* ---------------------------------------------------------------------
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* unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
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*
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* Function to calculate the core position on FVP.
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*
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* (ClusterId * FVP_MAX_CPUS_PER_CLUSTER) +
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* (ClusterId * FVP_MAX_CPUS_PER_CLUSTER * FVP_MAX_PE_PER_CPU) +
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* (CPUId * FVP_MAX_PE_PER_CPU) +
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* ThreadId
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* -----------------------------------------------------
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*
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* which can be simplified as:
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*
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* ((ClusterId * FVP_MAX_CPUS_PER_CLUSTER + CPUId) * FVP_MAX_PE_PER_CPU)
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* + ThreadId
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* ---------------------------------------------------------------------
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*/
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func plat_arm_calc_core_pos
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mov x3, x0
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/*
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* Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it
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* look as if in a multi-threaded implementation.
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@ -205,9 +208,9 @@ func plat_arm_calc_core_pos
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ubfx x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
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/* Compute linear position */
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mov x4, #FVP_MAX_PE_PER_CPU
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madd x0, x1, x4, x0
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mov x5, #FVP_MAX_CPUS_PER_CLUSTER
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madd x0, x2, x5, x0
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mov x4, #FVP_MAX_CPUS_PER_CLUSTER
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madd x1, x2, x4, x1
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mov x5, #FVP_MAX_PE_PER_CPU
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madd x0, x1, x5, x0
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ret
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endfunc plat_arm_calc_core_pos
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