xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

RISC-V: Access CSRs using CSR numbers

Browse Source 
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 addes CSRs by name.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Anup Patel
2019-04-25 08:38:41 +00:00
committed by Palmer Dabbelt
parent 6dcaf00487
commit a3182c91ef
9 changed files with 57 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/riscv/include/asm/mmu_context.h
View File

@@ -83,12 +83,7 @@ static inline void switch_mm(struct mm_struct *prev,
cpumask_clear_cpu(cpu, mm_cpumask(prev));
cpumask_set_cpu(cpu, mm_cpumask(next));
/*
* Use the old spbtr name instead of using the current satp
* name to support binutils 2.29 which doesn't know about the
* privileged ISA 1.10 yet.
*/
csr_write(sptbr, virt_to_pfn(next->pgd) | SATP_MODE);
csr_write(CSR_SATP, virt_to_pfn(next->pgd) | SATP_MODE);
local_flush_tlb_all();
flush_icache_deferred(next);