riscv: Access CSRs using CSR numbers
We should prefer accessing CSRs using their CSR numbers because: 1. It compiles fine with older toolchains. 2. We can use latest CSR names in #define macro names of CSR numbers as-per RISC-V spec. 3. We can access newly added CSRs even if toolchain does not recognize newly added CSRs by name. This commit is inspired from Linux kernel commit a3182c91ef4e ("RISC-V: Access CSRs using CSR numbers"). Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NRick Chen <rick@andestech.com> Reviewed-by: NAnup Patel <anup.patel@wdc.com> Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>
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