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[libcpu] arm64: implement cpuid get by assembly #9052

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Merged
BernardXiong merged 1 commit into from
Jun 11, 2024
Merged

[libcpu] arm64: implement cpuid get by assembly #9052

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15 changes: 12 additions & 3 deletions libcpu/aarch64/common/context_gcc.S
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Original file line number Diff line number Diff line change
Expand Up @@ -62,12 +62,21 @@ rt_hw_cpu_id_set:
/*
int rt_hw_cpu_id(void)
*/
.weak rt_hw_cpu_id
.type rt_hw_cpu_id, @function
rt_hw_cpu_id:
#ifdef ARCH_USING_GENERIC_CPUID
.globl rt_hw_cpu_id
#else /* !ARCH_USING_GENERIC_CPUID */
.weak rt_hw_cpu_id
#endif /* ARCH_USING_GENERIC_CPUID */

#if RT_CPUS_NR > 1
mrs x0, tpidr_el1
#else
#ifdef ARCH_USING_GENERIC_CPUID
mrs x0, tpidrro_el0
#else /* !ARCH_USING_GENERIC_CPUID */
mrs x0, tpidr_el1
#endif /* ARCH_USING_GENERIC_CPUID */
#else /* RT_CPUS_NR == 1 */
mov x0, xzr
#endif
ret
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18 changes: 0 additions & 18 deletions libcpu/aarch64/common/cpu.c
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Expand Up @@ -231,24 +231,6 @@ int rt_hw_cpu_boot_secondary(int num_cpus, rt_uint64_t *cpu_hw_ids, struct cpu_o

#endif /*RT_USING_SMP*/

/**
* Generic hw-cpu-id
*/
#ifdef ARCH_USING_GENERIC_CPUID

int rt_hw_cpu_id(void)
{
#if RT_CPUS_NR > 1
long cpuid;
__asm__ volatile("mrs %0, tpidrro_el0":"=r"(cpuid));
return cpuid;
#else
return 0;
#endif /* RT_CPUS_NR > 1 */
}

#endif /* ARCH_USING_GENERIC_CPUID */

/**
* @addtogroup ARM CPU
*/
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