[v3,0/3] Allow accessing CSR using CSR number

Message

Anup Patel April 15, 2019, 9:37 a.m. UTC

This patch series adds support to access CSR using both CSR name and
CSR numbers.

Also, 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. (e.g. sptbr => CSR_SATP, sbadaddr => CSR_STVAL, etc.)
3. We can access newly added CSRs even if toolchain does not recognize
   newly addes CSRs by name. (e.g. BSSTATUS, BSIE, SSIP, etc.)

The patchset can be found in riscv_csr_number_v3 branch of
https//github.com/avpatel/linux.git

Changes since v2:
 - Dropped PATCH1 which added asm/encoding.h
 - Added new PATCH1 which beautifies asm/csr.h by using tabs to
   align macro values

Changes since v1:
 - Squash PATCH2 into cpatch3
 - Added new PATCH2 to add interrupt related SCAUSE defines
   in asm/encoding.h

Anup Patel (3):
  RISC-V: Use tabs to align macro values in asm/csr.h
  RISC-V: Add interrupt related SCAUSE defines in asm/csr.h
  RISC-V: Access CSRs using CSR numbers

 arch/riscv/include/asm/csr.h         | 127 +++++++++++++++++----------
 arch/riscv/include/asm/irqflags.h    |  10 +--
 arch/riscv/include/asm/mmu_context.h |   7 +-
 arch/riscv/kernel/entry.S            |  22 ++---
 arch/riscv/kernel/head.S             |  12 +--
 arch/riscv/kernel/irq.c              |  23 +----
 arch/riscv/kernel/perf_event.c       |   4 +-
 arch/riscv/kernel/smp.c              |   2 +-
 arch/riscv/kernel/traps.c            |   6 +-
 arch/riscv/mm/fault.c                |   6 +-
 10 files changed, 115 insertions(+), 104 deletions(-)

--
2.17.1