@@ -501,6 +501,17 @@
__v; \
})
+#if __riscv_xlen < 64
+#define csr_read_hi_lo(csr) \
+({ \
+ u32 hi = csr_read(csr##H); \
+ u32 lo = csr_read(csr); \
+ lo | ((u64)hi << 32); \
+})
+#else
+#define csr_read_hi_lo csr_read
+#endif
+
#define csr_write(csr, val) \
({ \
unsigned long __v = (unsigned long)(val); \
@@ -509,6 +520,17 @@
: "memory"); \
})
+#if __riscv_xlen < 64
+#define csr_write_hi_lo(csr, val) \
+({ \
+ u64 _v = (u64)(val); \
+ csr_write(csr##H, (_v) >> 32); \
+ csr_write(csr, (_v)); \
+})
+#else
+#define csr_write_hi_lo csr_write
+#endif
+
#define csr_read_set(csr, val) \
({ \
unsigned long __v = (unsigned long)(val); \
In RV32, we may have the need to read both low 32 bit and high 32 bit of the CSR. Therefore adding the csr_read_hi_lo() and csr_write_hi_lo() to support such case. Suggested-by: Andrew Jones <ajones@ventanamicro.com> Suggested-by: Zong Li <zong.li@sifive.com> Signed-off-by: Nick Hu <nick.hu@sifive.com> --- arch/riscv/include/asm/csr.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)