d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add memrw. This has had minimal testing, and will likely panic the kernel

Browse Source 
when trying to read data from outside the DMAP region. I expect this panic
to be from within uiomove_fromphys, which needs to grow support to support
such addresses.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2015-07-31 13:39:51 +00:00
parent 9b8c3c4f0b
commit 872df66596
1 changed files with 70 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
sys/arm64/arm64/mem.c
View File

@ -33,15 +33,84 @@ __FBSDID("$FreeBSD$");
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/uio.h>
#include <machine/memdev.h>
#include <machine/vmparam.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_page.h>
struct mem_range_softc mem_range_softc;
int
memrw(struct cdev *dev, struct uio *uio, int flags)
{
struct iovec *iov;
struct vm_page m;
vm_page_t marr;
vm_offset_t off, v;
u_int cnt;
int error;
panic("ARM64TODO: memrw");
error = 0;
while (uio->uio_resid > 0 && error == 0) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("memrw");
continue;
}
v = uio->uio_offset;
off = v & PAGE_MASK;
cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off);
if (cnt == 0)
continue;
switch(dev2unit(dev)) {
case CDEV_MINOR_KMEM:
/* If the address is in the DMAP just copy it */
if (VIRT_IN_DMAP(v)) {
error = uiomove((void *)v, cnt, uio);
break;
}
if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ?
VM_PROT_READ : VM_PROT_WRITE)) {
error = EFAULT;
break;
}
/* Get the physical address to read */
v = pmap_extract(kernel_pmap, v);
if (v == 0) {
error = EFAULT;
break;
}
/* FALLTHROUGH */
case CDEV_MINOR_MEM:
/* If within the DMAP use this to copy from */
if (PHYS_IN_DMAP(v)) {
v = PHYS_TO_DMAP(v);
error = uiomove((void *)v, cnt, uio);
break;
}
/* Have uiomove_fromphys handle the data */
m.phys_addr = trunc_page(v);
marr = &m;
uiomove_fromphys(&marr, off, cnt, uio);
break;
}
}
return (error);
}