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- Allow access to direct mapped region via /dev/kmem. This makes

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'netstat -r' work.
- Use direct map for /dev/mem.
This commit is contained in:
simokawa 2003-06-22 12:59:43 +00:00
parent cc83270ff2
commit 4287eff159
1 changed files with 16 additions and 13 deletions
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29
sys/amd64/amd64/mem.c
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@ -157,26 +157,28 @@ mmrw(dev_t dev, struct uio *uio, int flags)
/* minor device 0 is physical memory */ /* minor device 0 is physical memory */
case 0: case 0:
v = uio->uio_offset; v = uio->uio_offset;
v &= ~PAGE_MASK; kmemphys:
pmap_kenter((vm_offset_t)ptvmmap, v); o = v & PAGE_MASK;
o = (int)uio->uio_offset & PAGE_MASK; c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o));
c = (u_long)(PAGE_SIZE - ((long)iov->iov_base & PAGE_MASK)); error = uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio);
c = min(c, (u_int)(PAGE_SIZE - o));
c = min(c, (u_int)iov->iov_len);
error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio);
pmap_qremove((vm_offset_t)ptvmmap, 1);
continue; continue;
/* minor device 1 is kernel memory */ /* minor device 1 is kernel memory */
case 1: case 1:
c = iov->iov_len; v = uio->uio_offset;
if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) {
v = DMAP_TO_PHYS(v);
goto kmemphys;
}
c = iov->iov_len;
/* /*
* Make sure that all of the pages are currently resident so * Make sure that all of the pages are currently resident so
* that we don't create any zero-fill pages. * that we don't create any zero-fill pages.
*/ */
addr = trunc_page(uio->uio_offset); addr = trunc_page(v);
eaddr = round_page(uio->uio_offset + c); eaddr = round_page(v + c);
if (addr < (vm_offset_t)KERNBASE) if (addr < (vm_offset_t)KERNBASE)
return (EFAULT); return (EFAULT);
@ -184,11 +186,12 @@ mmrw(dev_t dev, struct uio *uio, int flags)
if (pmap_extract(kernel_pmap, addr) == 0) if (pmap_extract(kernel_pmap, addr) == 0)
return (EFAULT); return (EFAULT);
if (!kernacc((caddr_t)(long)uio->uio_offset, c, if (!kernacc((caddr_t)(long)v, c,
uio->uio_rw == UIO_READ ? uio->uio_rw == UIO_READ ?
VM_PROT_READ : VM_PROT_WRITE)) VM_PROT_READ : VM_PROT_WRITE))
return (EFAULT); return (EFAULT);
error = uiomove((caddr_t)(long)uio->uio_offset, (int)c, uio);
error = uiomove((caddr_t)(long)v, (int)c, uio);
continue; continue;
default: default: