arm64: debug: Treat the BRPs/WRPs as unsigned
IDAA64DFR0_EL1: BRPs and WRPs are unsigned values. Use the appropriate helpers to extract those fields. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reported-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -138,16 +138,18 @@ extern struct pmu perf_ops_bp;
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/* Determine number of BRP registers available. */
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static inline int get_num_brps(void)
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{
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u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);
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return 1 +
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cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),
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cpuid_feature_extract_unsigned_field(dfr0,
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ID_AA64DFR0_BRPS_SHIFT);
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}
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/* Determine number of WRP registers available. */
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static inline int get_num_wrps(void)
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{
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u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);
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return 1 +
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cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),
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cpuid_feature_extract_unsigned_field(dfr0,
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ID_AA64DFR0_WRPS_SHIFT);
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}
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