D26622.id.diff
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	Index: head/sys/riscv/include/memdev.h
	===================================================================
	--- head/sys/riscv/include/memdev.h
	+++ head/sys/riscv/include/memdev.h
	@@ -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_ */
	Index: head/sys/riscv/riscv/mem.c
	===================================================================
	--- head/sys/riscv/riscv/mem.c
	+++ head/sys/riscv/riscv/mem.c
	@@ -122,6 +122,21 @@
	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)