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include: Make sbi_current_hartid() as macro in riscv_asm.h

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The sbi_current_hartid() being a regular function is quite
expensive because for callers it is a function call instead
of a direct CSR read. This patch converts sbi_current_hartid()
into a macro in riscv_asm.h.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-03-12 10:21:25 +05:30
committed by Anup Patel
parent 16e7071f6d
commit 823345ecae
20 changed files with 49 additions and 52 deletions
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2
include/sbi/riscv_asm.h
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@@ -157,6 +157,8 @@ void csr_write_num(int csr_num, unsigned long val);
__asm__ __volatile__("wfi" ::: "memory"); \
} while (0)
/* Get current HART id */
#define current_hartid() ((unsigned int)csr_read(CSR_MHARTID))
/* determine CPU extension, return non-zero support */
int misa_extension_imp(char ext);