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Merge pull request #1347 from davidcunado-arm/dc/affinities

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FVP: Fix function for translating MPIDR to linear index
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Dimitris Papastamos 2018-04-12 10:47:14 +01:00 committed by GitHub
commit 0f17a68324
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1 changed files with 14 additions and 8 deletions
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22
plat/arm/board/fvp/aarch32/fvp_helpers.S
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@ -104,15 +104,20 @@ func plat_is_my_cpu_primary
bx lr
endfunc plat_is_my_cpu_primary
/* -----------------------------------------------------
/* ---------------------------------------------------------------------
* unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
*
* Function to calculate the core position on FVP.
*
* (ClusterId * FVP_MAX_CPUS_PER_CLUSTER) +
* (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
* ---------------------------------------------------------------------
*/
func plat_arm_calc_core_pos
mov r3, r0
@ -125,14 +130,15 @@ func plat_arm_calc_core_pos
lsleq r3, r0, #MPIDR_AFFINITY_BITS
/* Extract individual affinity fields from MPIDR */
mov r2, #FVP_MAX_PE_PER_CPU
ubfx r0, r3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
ubfx r1, r3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
mla r0, r1, r2, r0
mov r1, #FVP_MAX_CPUS_PER_CLUSTER
ubfx r2, r3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
mla r0, r1, r2, r0
/* Compute linear position */
mov r3, #FVP_MAX_CPUS_PER_CLUSTER
mla r1, r2, r3, r1
mov r3, #FVP_MAX_PE_PER_CPU
mla r0, r1, r3, r0
bx lr
endfunc plat_arm_calc_core_pos