Use "access_type" in pmap_enter() more intelligent.
Allocate device register space bigger than the logical page size from the kernel map, thus decreasing the pre-allocated page table memory.
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ragge
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8b4801d18a
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e9689cc9bd
@ -1,4 +1,4 @@
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/* $NetBSD: cpu.h,v 1.34 1999/02/02 18:37:22 ragge Exp $ */
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/* $NetBSD: cpu.h,v 1.35 1999/04/17 00:01:18 ragge Exp $ */
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/*
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* Copyright (c) 1994 Ludd, University of Lule}, Sweden
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@ -109,7 +109,7 @@ extern int want_resched; /* resched() was called */
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/*
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* This defines the I/O device register space size in pages.
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*/
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#define IOSPSZ ((1*1024*1024) / VAX_NBPG) /* 1 MB == 2k pages */
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#define IOSPSZ ((64*1024) / VAX_NBPG) /* 64k == 128 pages */
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struct device;
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@ -1,4 +1,4 @@
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/* $NetBSD: machdep.c,v 1.78 1999/04/14 23:42:00 ragge Exp $ */
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/* $NetBSD: machdep.c,v 1.79 1999/04/17 00:01:19 ragge Exp $ */
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/*
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* Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
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@ -816,6 +816,8 @@ process_sstep(p, sstep)
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* uses resource maps when allocating space, which is allocated from
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* the IOMAP submap. The implementation is similar to the uba resource
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* map handling. Size is given in pages.
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* If the page requested is bigger than a logical page, space is
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* allocated from the kernel map instead.
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*
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* It is known that the first page in the iospace area is unused; it may
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* be use by console device drivers (before the map system is inited).
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@ -834,13 +836,19 @@ vax_map_physmem(phys, size)
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if (!iospace_inited)
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panic("vax_map_physmem: called before rminit()?!?");
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#endif
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pageno = rmalloc(iomap, size);
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if (pageno == 0) {
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if (warned++ == 0) /* Warn only once */
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printf("vax_map_physmem: iomap too small\n");
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return 0;
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if (size >= LTOHPN) {
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addr = uvm_km_valloc(kernel_map, size * VAX_NBPG);
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if (addr == 0)
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panic("vax_map_physmem: kernel map full");
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} else {
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pageno = rmalloc(iomap, size);
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if (pageno == 0) {
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if (warned++ == 0) /* Warn only once */
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printf("vax_map_physmem: iomap too small");
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return 0;
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}
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addr = iospace + (pageno * VAX_NBPG);
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}
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addr = iospace + (pageno * VAX_NBPG);
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ioaccess(addr, phys, size);
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#ifdef PHYSMEMDEBUG
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printf("vax_map_physmem: alloc'ed %d pages for paddr %lx, at %lx\n",
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@ -863,6 +871,9 @@ vax_unmap_physmem(addr, size)
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printf("vax_unmap_physmem: unmapping %d pages at addr %lx\n",
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size, addr);
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#endif
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rmfree(iomap, size, pageno);
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iounaccess(addr, size);
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if (size >= LTOHPN)
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uvm_km_free(kernel_map, addr, size * VAX_NBPG);
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else
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rmfree(iomap, size, pageno);
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: pmap.c,v 1.61 1999/03/26 23:41:38 mycroft Exp $ */
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/* $NetBSD: pmap.c,v 1.62 1999/04/17 00:01:19 ragge Exp $ */
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/*
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* Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
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* All rights reserved.
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@ -556,38 +556,39 @@ printf("pmap_kenter_pgs: va: %lx, pgs %p, npgs %x\n", va, pgs, npgs);
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}
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#endif
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void
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/*
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* pmap_enter() is the main routine that puts in mappings for pages, or
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* upgrades mappings to more "rights". Note that:
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* - "wired" isn't used. We don't loose mappings unless asked for.
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* - "access_type" is set if the entering was caused by a fault.
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*/
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void
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pmap_enter(pmap, v, p, prot, wired, access_type)
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register pmap_t pmap;
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pmap_t pmap;
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vaddr_t v;
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paddr_t p;
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vm_prot_t prot;
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boolean_t wired;
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vm_prot_t access_type;
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vm_prot_t prot, access_type;
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boolean_t wired;
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{
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struct pv_entry *pv, *tmp;
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int i, s, nypte, *patch;
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int i, s, newpte, oldpte, *patch;
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#ifdef PMAPDEBUG
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if(startpmapdebug)
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printf("pmap_enter: pmap: %p,virt %lx, phys %lx, prot %x w %x\n",
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pmap,v,p,prot, wired);
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#endif
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/* Can this happen with UVM??? */
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if (pmap == 0)
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return;
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if (v < 0x40000000) {
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/* Find addess of correct pte */
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if (v & KERNBASE) {
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patch = (int *)Sysmap;
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i = (v - KERNBASE) >> VAX_PGSHIFT;
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newpte = (p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_KW:PG_KR);
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} else if (v < 0x40000000) {
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patch = (int *)pmap->pm_p0br;
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i = (v >> VAX_PGSHIFT);
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if (i >= (pmap->pm_p0lr & ~AST_MASK))
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panic("P0 too small in pmap_enter");
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patch = (int *)pmap->pm_p0br;
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nypte = PG_V|(p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_RW:PG_RO);
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} else if (v & KERNBASE) {
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patch = (int *)Sysmap;
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i = (v - KERNBASE) >> VAX_PGSHIFT;
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nypte = PG_V|(p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_KW:PG_KR);
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newpte = (p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_RW:PG_RO);
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} else {
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patch = (int *)pmap->pm_p1br;
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i = (v - 0x40000000) >> VAX_PGSHIFT;
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@ -595,30 +596,29 @@ printf("pmap_enter: pmap: %p,virt %lx, phys %lx, prot %x w %x\n",
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panic("pmap_enter: must expand P1");
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if (v < pmap->pm_stack)
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pmap->pm_stack = v;
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nypte = PG_V|(p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_RW:PG_RO);
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newpte = (p>>VAX_PGSHIFT)|(prot&VM_PROT_WRITE?PG_RW:PG_RO);
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}
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if ((patch[i] & ~PG_M) == nypte)
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oldpte = patch[i] & ~(PG_V|PG_M);
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/* No mapping change. Can this happen??? */
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if (newpte == oldpte)
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return;
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if ((patch[i] & PG_FRAME) &&
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((patch[i] & PG_FRAME) != (nypte & PG_FRAME)))
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#ifdef PMAP_NEW
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pmap_page_protect(PHYS_TO_VM_PAGE((patch[i] & PG_FRAME)
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<< VAX_PGSHIFT), 0);
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#else
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pmap_page_protect((patch[i] & PG_FRAME) << VAX_PGSHIFT, 0);
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#endif
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pv = pv_table + (p >> PGSHIFT);
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/* Changing mapping? */
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oldpte &= PG_FRAME;
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if ((newpte & PG_FRAME) != oldpte) {
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/* Mapped before? Remove it then. */
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if (oldpte)
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pmap_page_protect(PHYS_TO_VM_PAGE((oldpte
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<< VAX_PGSHIFT)), 0);
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/*
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* If we map in a new physical page we also must add it
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* in the pv_table.
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*/
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if ((patch[i] & PG_FRAME) != (nypte & PG_FRAME)) {
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pv = pv_table + (p >> PGSHIFT);
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s = splimp();
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if (pv->pv_pte == 0) {
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pv->pv_pte = (struct pte *)&patch[i];
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pv->pv_pte = (struct pte *) & patch[i];
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pv->pv_pmap = pmap;
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} else {
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MALLOC(tmp, struct pv_entry *, sizeof(struct pv_entry),
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@ -633,19 +633,27 @@ printf("pmap_enter: pmap: %p,virt %lx, phys %lx, prot %x w %x\n",
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pv->pv_next = tmp;
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}
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splx(s);
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} else {
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/* No mapping change, just flush the TLB */
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mtpr(0, PR_TBIA);
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}
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pmap->pm_stats.resident_count++;
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patch[i] = nypte;
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patch[i+1] = nypte+1;
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patch[i+2] = nypte+2;
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patch[i+3] = nypte+3;
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patch[i+4] = nypte+4;
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patch[i+5] = nypte+5;
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patch[i+6] = nypte+6;
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patch[i+7] = nypte+7;
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if (access_type & VM_PROT_READ) {
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pv->pv_attr |= PG_V;
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newpte |= PG_V;
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}
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if (access_type & VM_PROT_WRITE)
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pv->pv_attr |= PG_M;
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mtpr(0, PR_TBIA);
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patch[i] = newpte;
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patch[i+1] = newpte+1;
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patch[i+2] = newpte+2;
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patch[i+3] = newpte+3;
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patch[i+4] = newpte+4;
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patch[i+5] = newpte+5;
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patch[i+6] = newpte+6;
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patch[i+7] = newpte+7;
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}
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void *
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