git: aa594ddcc854 - stable/14 - arm64: Add an SVE sysarch
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Date: Mon, 21 Oct 2024 15:05:12 UTC
The branch stable/14 has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=aa594ddcc85459ed342694816df26434e96ba88a commit aa594ddcc85459ed342694816df26434e96ba88a Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2024-09-27 13:37:10 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2024-10-21 15:03:26 +0000 arm64: Add an SVE sysarch To allow for user space to read the SVE vector length add a sysarch handler to return the value to userspace. Reviewed by: imp Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D43308 (cherry picked from commit 87a58d931db7b40d8d225a7edb82b78937078b7f) --- sys/arm64/arm64/sys_machdep.c | 22 +++++++++++++++++++++- sys/arm64/include/sysarch.h | 3 +++ 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/sys/arm64/arm64/sys_machdep.c b/sys/arm64/arm64/sys_machdep.c index c50b745cfba0..aba864b9526e 100644 --- a/sys/arm64/arm64/sys_machdep.c +++ b/sys/arm64/arm64/sys_machdep.c @@ -29,14 +29,34 @@ #include <sys/cdefs.h> #include <sys/param.h> +#include <sys/proc.h> #include <sys/systm.h> #include <sys/sysproto.h> +#include <machine/pcb.h> #include <machine/sysarch.h> +#include <security/audit/audit.h> + int sysarch(struct thread *td, struct sysarch_args *uap) { + struct pcb *pcb; + unsigned long sve_len; + int error; + + switch (uap->op) { + case ARM64_GET_SVE_VL: + pcb = td->td_pcb; + sve_len = pcb->pcb_sve_len; + error = EINVAL; + if (sve_len != 0) + error = copyout(&sve_len, uap->parms, sizeof(sve_len)); + break; + default: + error = EINVAL; + break; + } - return (ENOTSUP); + return (error); } diff --git a/sys/arm64/include/sysarch.h b/sys/arm64/include/sysarch.h index 2bd45d384743..f72d3427602e 100644 --- a/sys/arm64/include/sysarch.h +++ b/sys/arm64/include/sysarch.h @@ -39,6 +39,9 @@ #ifndef _MACHINE_SYSARCH_H_ #define _MACHINE_SYSARCH_H_ +#define ARM64_GET_SVE_VL 0x200 +/* Reserved ARM64_SET_SVE_VL 0x201 */ + #ifndef _KERNEL __BEGIN_DECLS