svn commit: r366315 - in head/sys/riscv: include riscv
Kristof Provost
kp at FreeBSD.org
Thu Oct 1 15:04:56 UTC 2020
Author: kp
Date: Thu Oct 1 15:04:55 2020
New Revision: 366315
URL: https://svnweb.freebsd.org/changeset/base/366315
Log:
riscv: Add memmmap so we can mmap /dev/mem
Reviewed by: mhorne
Sponsored by: Axiado
Differential Revision: https://reviews.freebsd.org/D26622
Modified:
head/sys/riscv/include/memdev.h
head/sys/riscv/riscv/mem.c
Modified: head/sys/riscv/include/memdev.h
==============================================================================
--- head/sys/riscv/include/memdev.h Thu Oct 1 14:20:36 2020 (r366314)
+++ head/sys/riscv/include/memdev.h Thu Oct 1 15:04:55 2020 (r366315)
@@ -35,6 +35,6 @@
d_open_t memopen;
d_read_t memrw;
d_ioctl_t memioctl_md;
-#define memmmap (d_mmap_t *)NULL
+d_mmap_t memmmap;
#endif /* _MACHINE_MEMDEV_H_ */
Modified: head/sys/riscv/riscv/mem.c
==============================================================================
--- head/sys/riscv/riscv/mem.c Thu Oct 1 14:20:36 2020 (r366314)
+++ head/sys/riscv/riscv/mem.c Thu Oct 1 15:04:55 2020 (r366315)
@@ -122,6 +122,21 @@ memrw(struct cdev *dev, struct uio *uio, int flags)
return (error);
}
+/*
+ * Allow user processes to MMAP some memory sections
+ * instead of going through read/write.
+ */
+int
+memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
+ int prot __unused, vm_memattr_t *memattr __unused)
+{
+ if (dev2unit(dev) == CDEV_MINOR_MEM) {
+ *paddr = offset;
+ return (0);
+ }
+ return (-1);
+}
+
int
memioctl_md(struct cdev *dev __unused, u_long cmd __unused,
caddr_t data __unused, int flags __unused, struct thread *td __unused)
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