Messages in this thread Patch in this message | | | From | Tiezhu Yang <> | Subject | [PATCH] LoongArch: Fix wrong fpu version | Date | Sat, 18 Jun 2022 12:50:31 +0800 |
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According to the configuration information accessible by the CPUCFG instruction in LoongArch Reference Manual [1], FP_ver is stored in bit [5: 3] of CPUCFG2, the current code to get fpu version is wrong, use CPUCFG2_FPVERS to fix it.
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
Fixes: 628c3bb40e9a ("LoongArch: Add boot and setup routines") Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> --- arch/loongarch/kernel/cpu-probe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c index 6c87ea3..529ab8f4 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -263,7 +263,7 @@ void cpu_probe(void) c->cputype = CPU_UNKNOWN; c->processor_id = read_cpucfg(LOONGARCH_CPUCFG0); - c->fpu_vers = (read_cpucfg(LOONGARCH_CPUCFG2) >> 3) & 0x3; + c->fpu_vers = (read_cpucfg(LOONGARCH_CPUCFG2) & CPUCFG2_FPVERS) >> 3; c->fpu_csr0 = FPU_CSR_RN; c->fpu_mask = FPU_CSR_RSVD; -- 2.1.0
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