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Diffstat (limited to 'arch/riscv/kernel/cpu.c')
-rw-r--r--arch/riscv/kernel/cpu.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index d11d6320fb..c1f3655238 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -139,6 +139,34 @@ int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
return -1;
}
+unsigned long __init riscv_get_marchid(void)
+{
+ struct riscv_cpuinfo *ci = this_cpu_ptr(&riscv_cpuinfo);
+
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+ ci->marchid = sbi_spec_is_0_1() ? 0 : sbi_get_marchid();
+#elif IS_ENABLED(CONFIG_RISCV_M_MODE)
+ ci->marchid = csr_read(CSR_MARCHID);
+#else
+ ci->marchid = 0;
+#endif
+ return ci->marchid;
+}
+
+unsigned long __init riscv_get_mvendorid(void)
+{
+ struct riscv_cpuinfo *ci = this_cpu_ptr(&riscv_cpuinfo);
+
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+ ci->mvendorid = sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid();
+#elif IS_ENABLED(CONFIG_RISCV_M_MODE)
+ ci->mvendorid = csr_read(CSR_MVENDORID);
+#else
+ ci->mvendorid = 0;
+#endif
+ return ci->mvendorid;
+}
+
DEFINE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
unsigned long riscv_cached_mvendorid(unsigned int cpu_id)
@@ -170,12 +198,16 @@ static int riscv_cpuinfo_starting(unsigned int cpu)
struct riscv_cpuinfo *ci = this_cpu_ptr(&riscv_cpuinfo);
#if IS_ENABLED(CONFIG_RISCV_SBI)
- ci->mvendorid = sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid();
- ci->marchid = sbi_spec_is_0_1() ? 0 : sbi_get_marchid();
+ if (!ci->mvendorid)
+ ci->mvendorid = sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid();
+ if (!ci->marchid)
+ ci->marchid = sbi_spec_is_0_1() ? 0 : sbi_get_marchid();
ci->mimpid = sbi_spec_is_0_1() ? 0 : sbi_get_mimpid();
#elif IS_ENABLED(CONFIG_RISCV_M_MODE)
- ci->mvendorid = csr_read(CSR_MVENDORID);
- ci->marchid = csr_read(CSR_MARCHID);
+ if (!ci->mvendorid)
+ ci->mvendorid = csr_read(CSR_MVENDORID);
+ if (!ci->marchid)
+ ci->marchid = csr_read(CSR_MARCHID);
ci->mimpid = csr_read(CSR_MIMPID);
#else
ci->mvendorid = 0;