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csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO

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It could help to reduce the latency of the time-related functions
in user space.

We have referenced arm's and riscv's implementation for the patch.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren
2021-01-17 23:38:18 +08:00
parent 8dcbc611f0
commit 0d3b051adb
14 changed files with 225 additions and 3 deletions
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arch/csky/abiv2/inc/abi/regdef.h
+5
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@@ -4,7 +4,12 @@
#ifndef __ASM_CSKY_REGDEF_H
#define __ASM_CSKY_REGDEF_H
#ifdef __ASSEMBLY__
#define syscallid r7
#else
#define syscallid "r7"
#endif
#define regs_syscallid(regs) regs->regs[3]
#define regs_fp(regs) regs->regs[4]