riscv: provide missing base extension functions

Provide library functions to read:

* machine vendor ID
* machine architecture ID
* machine implementation ID

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 76453121ea13a9bf443b3439dce72ed147302987..81fcfe0b3638295f2b079515f394d66793b6d3ac 100644 (file)
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -155,6 +155,9 @@ long sbi_get_spec_version(void);
 int sbi_get_impl_id(void);
 int sbi_get_impl_version(long *version);
 int sbi_probe_extension(int ext);
+int sbi_get_mvendorid(long *mvendorid);
+int sbi_get_marchid(long *marchid);
+int sbi_get_mimpid(long *mimpid);
 void sbi_srst_reset(unsigned long type, unsigned long reason);
 
 #endif

diff --git a/arch/riscv/lib/sbi.c b/arch/riscv/lib/sbi.c
index d427d1b29eaf70feee5731841b95cbcd031a036a..8724e3a4600fca93fda445f48194c575b274c19e 100644 (file)
--- a/arch/riscv/lib/sbi.c
+++ b/arch/riscv/lib/sbi.c
@@ -127,6 +127,71 @@ int sbi_probe_extension(int extid)
        return -ENOTSUPP;
 }
 
+/**
+ * sbi_get_mvendorid() - get machine vendor ID
+ *
+ * @mimpid:    on return machine vendor ID
+ * Return:     0 on success
+ */
+int sbi_get_mvendorid(long *mvendorid)
+{
+       struct sbiret ret;
+
+       ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MVENDORID,
+                       0, 0, 0, 0, 0, 0);
+       if (ret.error)
+               return -ENOTSUPP;
+
+       if (mvendorid)
+               *mvendorid = ret.value;
+
+       return 0;
+}
+
+/**
+ * sbi_get_marchid() - get machine architecture ID
+ *
+ * @mimpid:    on return machine architecture ID
+ * Return:     0 on success
+ */
+int sbi_get_marchid(long *marchid)
+{
+       struct sbiret ret;
+
+       ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MARCHID,
+                       0, 0, 0, 0, 0, 0);
+
+       if (ret.error)
+               return -ENOTSUPP;
+
+       if (marchid)
+               *marchid = ret.value;
+
+       return 0;
+}
+
+/**
+ * sbi_get_mimpid() - get machine implementation ID
+ *
+ * @mimpid:    on return machine implementation ID
+ * Return:     0 on success
+ */
+int sbi_get_mimpid(long *mimpid)
+{
+       struct sbiret ret;
+
+       ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MIMPID,
+                       0, 0, 0, 0, 0, 0);
+
+       if (ret.error)
+               return -ENOTSUPP;
+
+       if (mimpid)
+               *mimpid = ret.value;
+
+       return 0;
+}
+
 /**
  * sbi_srst_reset() - invoke system reset extension
  *