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Add vmapbuf/vunmapbuf for VAXstations that need them.

This commit is contained in:
ragge 1996-07-20 18:02:47 +00:00
parent caff7b03d4
commit a6c464a5f7
1 changed files with 59 additions and 1 deletions
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60
sys/arch/vax/vax/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.25 1996/05/19 16:44:33 ragge Exp $ */
/* $NetBSD: vm_machdep.c,v 1.26 1996/07/20 18:02:47 ragge Exp $ */
/*
* Copyright (c) 1994 Ludd, University of Lule}, Sweden.
@ -56,6 +56,7 @@
#include <machine/pcb.h>
#include <machine/frame.h>
#include <machine/cpu.h>
#include <machine/sid.h>
#include <sys/syscallargs.h>
@ -562,3 +563,60 @@ cpu_swapin(p)
*j = 0; /* Set kernel stack red zone */
#endif
}
#if VAX410 || VAX43
/*
* vmapbuf()/vunmapbuf() only used on some vaxstations without
* any busadapter with MMU.
* XXX - This must be reworked to be effective.
*/
void
vmapbuf(bp, len)
struct buf *bp;
vm_size_t len;
{
vm_offset_t faddr, taddr, off, pa;
pmap_t fmap, tmap;
if ((vax_boardtype != VAX_BTYP_43) && (vax_boardtype != VAX_BTYP_410))
return;
faddr = trunc_page(bp->b_saveaddr = bp->b_data);
off = (vm_offset_t)bp->b_data - faddr;
len = round_page(off + len);
taddr = kmem_alloc_wait(phys_map, len);
bp->b_data = (caddr_t)(taddr + off);
fmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
tmap = vm_map_pmap(phys_map);
len = len >> PGSHIFT;
while (len--) {
pa = pmap_extract(fmap, faddr);
if (pa == 0)
panic("vmapbuf: null page frame for %x", faddr);
pmap_enter(tmap, taddr, pa & ~(NBPG - 1),
VM_PROT_READ|VM_PROT_WRITE, TRUE);
faddr += NBPG;
taddr += NBPG;
}
}
/*
* Free the io map PTEs associated with this IO operation.
* We also invalidate the TLB entries and restore the original b_addr.
*/
void
vunmapbuf(bp, len)
struct buf *bp;
vm_size_t len;
{
vm_offset_t addr, off;
if ((vax_boardtype != VAX_BTYP_43) && (vax_boardtype != VAX_BTYP_410))
return;
addr = trunc_page(bp->b_data);
off = (vm_offset_t)bp->b_data - addr;
len = round_page(off + len);
kmem_free_wakeup(phys_map, addr, len);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = 0;
}
#endif