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riscv: Add memmmap so we can mmap /dev/mem
Reviewed by: mhorne Sponsored by: Axiado Differential Revision: https://reviews.freebsd.org/D26622
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=366315
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@ -35,6 +35,6 @@
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d_open_t memopen;
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d_read_t memrw;
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d_ioctl_t memioctl_md;
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#define memmmap (d_mmap_t *)NULL
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d_mmap_t memmmap;
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#endif /* _MACHINE_MEMDEV_H_ */
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@ -122,6 +122,21 @@ memrw(struct cdev *dev, struct uio *uio, int flags)
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return (error);
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}
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/*
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* Allow user processes to MMAP some memory sections
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* instead of going through read/write.
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*/
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int
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memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int prot __unused, vm_memattr_t *memattr __unused)
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{
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if (dev2unit(dev) == CDEV_MINOR_MEM) {
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*paddr = offset;
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return (0);
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}
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return (-1);
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}
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int
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memioctl_md(struct cdev *dev __unused, u_long cmd __unused,
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caddr_t data __unused, int flags __unused, struct thread *td __unused)
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