Messages in this thread | | | From | Anup Patel <> | Subject | [PATCH v2 0/3] Allow accessing CSR using CSR number | Date | Sat, 13 Apr 2019 15:38:31 +0000 |
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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_v2 branch of https//github.com/avpatel/linux.git
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: Add separate asm/encoding.h for spec related defines RISC-V: Add interrupt related SCAUSE defines in asm/encoding.h RISC-V: Access CSRs using CSR numbers
arch/riscv/include/asm/csr.h | 67 +++----------------- arch/riscv/include/asm/encoding.h | 95 ++++++++++++++++++++++++++++ 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 | 9 +-- 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 +- 11 files changed, 139 insertions(+), 101 deletions(-) create mode 100644 arch/riscv/include/asm/encoding.h
-- 2.17.1
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