The branch stable/14 has been updated by andrew:
URL:
https://cgit.FreeBSD.org/src/commit/?id=aa594ddcc85459ed342694816df26434e96ba88a
commit aa594ddcc85459ed342694816df26434e96ba88a
Author: Andrew Turner <and...@freebsd.org>
AuthorDate: 2024-09-27 13:37:10 +0000
Commit: Andrew Turner <and...@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
