int
mm_md_readwrite(dev_t dev, struct uio *uio)
{
switch (minor(dev)) {
case DEV_EEPROM:
return eeprom_uio(uio);
case DEV_LEDS:
return leds_uio(uio);
default:
return ENXIO;
}
}
/*ARGSUSED*/
int
mmrw(dev_t dev, struct uio *uio, int flags)
{
vaddr_t va;
paddr_t pa;
int o, c;
struct iovec *iov;
int error = 0;
static int physlock;
vm_prot_t prot;
extern void *vmmap;
if (minor(dev) == DEV_MEM) {
/* lock against other uses of shared vmmap */
while (physlock > 0) {
physlock++;
error = tsleep((void *)&physlock, PZERO | PCATCH,
"mmrw", 0);
if (error)
return (error);
}
physlock = 1;
}
while (uio->uio_resid > 0 && error == 0) {
int n;
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("mmrw");
continue;
}
/* Note how much is still to go */
n = uio->uio_resid;
switch (minor(dev)) {
case DEV_MEM:
pa = (paddr_t)uio->uio_offset;
if (!pmap_pa_exists(pa)) {
error = EFAULT;
goto unlock;
}
prot = uio->uio_rw == UIO_READ ? VM_PROT_READ :
VM_PROT_WRITE;
pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
trunc_page(pa), prot, prot|PMAP_WIRED);
pmap_update(pmap_kernel());
o = uio->uio_offset & PGOFSET;
c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
error = uiomove((char *)vmmap + o, c, uio);
pmap_remove(pmap_kernel(),
(vaddr_t)vmmap, (vaddr_t)vmmap + PAGE_SIZE);
pmap_update(pmap_kernel());
break;
case DEV_KMEM:
va = (vaddr_t)uio->uio_offset;
if (va >= MSGBUF_VA && va < MSGBUF_VA+PAGE_SIZE) {
c = min(iov->iov_len, 4096);
} else if (va >= prom_vstart && va < prom_vend &&
uio->uio_rw == UIO_READ) {
/* Allow read-only access to the PROM */
c = min(iov->iov_len, prom_vend - prom_vstart);
} else {
c = min(iov->iov_len, MAXPHYS);
if (!uvm_kernacc((void *)va, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return (EFAULT);
}
error = uiomove((void *)va, c, uio);
break;
case DEV_NULL:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
return (0);
/* XXX should add sbus, etc */
#if defined(SUN4)
case DEV_EEPROM:
if (cputyp == CPU_SUN4)
error = eeprom_uio(uio);
else
error = ENXIO;
break;
#endif /* SUN4 */
case DEV_ZERO:
if (uio->uio_rw == UIO_WRITE) {
uio->uio_resid = 0;
return(0);
}
if (zeropage == NULL) {
zeropage = (void *)
malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
bzero(zeropage, PAGE_SIZE);
}
c = min(iov->iov_len, PAGE_SIZE);
error = uiomove(zeropage, c, uio);
break;
default:
return (ENXIO);
}
/* If we didn't make any progress (i.e. EOF), we're done here */
if (n == uio->uio_resid)
break;
}
if (minor(dev) == 0) {
unlock:
if (physlock > 1)
wakeup((void *)&physlock);
physlock = 0;
}
return (error);
}
