5 commits

Author	SHA1	Message	Date
Mark Johnston	6f8ba91638	RISC-V: Implement get_cyclecount(9). ... Add the missing implementation for get_cyclecount(9) on RISC-V by reading the cycle CSR. Submitted by: Mitchell Horne <mhorne063@gmail.com> Reviewed by: jhb MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D17953	2018-11-13 18:20:27 +00:00
John Baldwin	4cbbb74888	Add a KPI for the delay while spinning on a spin lock. ... Replace a call to DELAY(1) with a new cpu_lock_delay() KPI. Currently cpu_lock_delay() is defined to DELAY(1) on all platforms. However, platforms with a DELAY() implementation that uses spin locks should implement a custom cpu_lock_delay() doesn't use locks. Reviewed by: kib MFC after: 3 days	2018-11-05 21:34:17 +00:00
Ruslan Bukin	b51092c7ec	Use SPP (Supervisor Previous Privilege) bit in the sstatus ... register to determine if trap is from userspace. Otherwise if we jump to kernel address from userspace, then TRAPF_USERMODE failed to detect usermode and then do_ast triggers a panic "ast in kernel mode". Reviewed by: markj@ Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D16469	2018-07-27 16:13:06 +00:00
Ruslan Bukin	98f50c44e3	Update RISC-V port to Privileged Architecture Version 1.9. ... Sponsored by: DARPA, AFRL Sponsored by: HEIF5	2016-08-02 14:50:14 +00:00
Ruslan Bukin	8d7e7a98db	Import RISC-V machine headers. This is a minimal set required to compile ... kernel and userland. Reviewed by: andrew, imp, kib Sponsored by: DARPA, AFRL Sponsored by: HEIF5 Differential Revision: https://reviews.freebsd.org/D4554	2015-12-17 18:44:30 +00:00