Add a new function, pmap_alloc_ptpt(), that allocates the PTPT and
maps it the way we want, rather than using uvm_km_zalloc() and playing the "revoke cacheability" song-and-dance.
This commit is contained in:
thorpej
parent
7f1019eef4
commit
2b924304ab
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@ -1,4 +1,4 @@
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/* $NetBSD: pmap.c,v 1.92 2002/04/10 15:56:21 thorpej Exp $ */
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/* $NetBSD: pmap.c,v 1.93 2002/04/10 17:08:13 thorpej Exp $ */
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/*
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* Copyright (c) 2002 Wasabi Systems, Inc.
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@ -143,7 +143,7 @@
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#include <machine/param.h>
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#include <arm/arm32/katelib.h>
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__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.92 2002/04/10 15:56:21 thorpej Exp $");
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__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.93 2002/04/10 17:08:13 thorpej Exp $");
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#ifdef PMAP_DEBUG
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#define PDEBUG(_lev_,_stat_) \
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if (pmap_debug_level >= (_lev_)) \
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@ -285,6 +285,9 @@ static int pmap_allocpagedir __P((struct pmap *));
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static int pmap_clean_page __P((struct pv_entry *, boolean_t));
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static void pmap_remove_all __P((struct vm_page *));
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static int pmap_alloc_ptpt(struct pmap *);
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static void pmap_free_ptpt(struct pmap *);
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static struct vm_page *pmap_alloc_ptp __P((struct pmap *, vaddr_t));
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static struct vm_page *pmap_get_ptp __P((struct pmap *, vaddr_t));
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__inline static void pmap_clearbit __P((struct vm_page *, unsigned int));
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@ -1329,21 +1332,75 @@ pmap_free_l1pt(struct l1pt *pt)
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free(pt, M_VMPMAP);
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}
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/*
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* pmap_alloc_ptpt:
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*
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* Allocate the page table that maps the PTE array.
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*/
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static int
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pmap_alloc_ptpt(struct pmap *pmap)
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{
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struct vm_page *pg;
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pt_entry_t *pte;
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KASSERT(pmap->pm_vptpt == 0);
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pmap->pm_vptpt = uvm_km_valloc(kernel_map, L2_TABLE_SIZE);
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if (pmap->pm_vptpt == 0) {
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PDEBUG(0,
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printf("pmap_alloc_ptpt: no KVA for PTPT\n"));
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return (ENOMEM);
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}
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for (;;) {
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pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_ZERO);
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if (pg != NULL)
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break;
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uvm_wait("pmap_ptpt");
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}
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pmap->pm_pptpt = VM_PAGE_TO_PHYS(pg);
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pte = vtopte(pmap->pm_vptpt);
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KDASSERT(pmap_pte_v(pte) == 0);
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*pte = L2_S_PROTO | pmap->pm_pptpt |
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L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE);
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return (0);
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}
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/*
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* pmap_free_ptpt:
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*
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* Free the page table that maps the PTE array.
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*/
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static void
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pmap_free_ptpt(struct pmap *pmap)
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{
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pmap_kremove(pmap->pm_vptpt, L2_TABLE_SIZE);
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pmap_update(pmap_kernel());
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uvm_pagefree(PHYS_TO_VM_PAGE(pmap->pm_pptpt));
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uvm_km_free(kernel_map, pmap->pm_vptpt, L2_TABLE_SIZE);
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}
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/*
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* Allocate a page directory.
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* This routine will either allocate a new page directory from the pool
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* of L1 page tables currently held by the kernel or it will allocate
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* a new one via pmap_alloc_l1pt().
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* It will then initialise the l1 page table for use.
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*
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* XXX must tidy up and fix this code, not happy about how it does the pmaps_locking
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*/
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static int
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pmap_allocpagedir(struct pmap *pmap)
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{
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paddr_t pa;
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struct l1pt *pt;
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pt_entry_t *pte;
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int error;
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PDEBUG(0, printf("pmap_allocpagedir(%p)\n", pmap));
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@ -1378,35 +1435,19 @@ pmap_allocpagedir(struct pmap *pmap)
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bzero((void *)pmap->pm_pdir, (L1_TABLE_SIZE - KERNEL_PD_SIZE));
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/* Allocate a page table to map all the page tables for this pmap */
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#ifdef DIAGNOSTIC
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if (pmap->pm_vptpt) {
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/* XXX What if we have one already ? */
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panic("pmap_allocpagedir: have pt already\n");
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}
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#endif /* DIAGNOSTIC */
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pmap->pm_vptpt = uvm_km_zalloc(kernel_map, NBPG);
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if (pmap->pm_vptpt == 0) {
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pmap_freepagedir(pmap);
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return(ENOMEM);
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if ((error = pmap_alloc_ptpt(pmap)) != 0) {
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pmap_freepagedir(pmap);
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return (error);
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}
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/* need to lock this all up for growkernel */
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/* need to lock this all up for growkernel */
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simple_lock(&pmaps_lock);
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/* wish we didn't have to keep this locked... */
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/* Duplicate the kernel mappings. */
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bcopy((char *)pmap_kernel()->pm_pdir + (L1_TABLE_SIZE - KERNEL_PD_SIZE),
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(char *)pmap->pm_pdir + (L1_TABLE_SIZE - KERNEL_PD_SIZE),
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KERNEL_PD_SIZE);
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pte = vtopte(pmap->pm_vptpt);
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pmap->pm_pptpt = l2pte_pa(*pte);
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/* Revoke cacheability and bufferability */
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/* XXX should be done better than this */
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*pte &= ~L2_S_CACHE_MASK;
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/* Wire in this page table */
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pmap_map_in_l1(pmap, PTE_BASE, pmap->pm_pptpt, TRUE);
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@ -1486,7 +1527,7 @@ pmap_freepagedir(struct pmap *pmap)
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{
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/* Free the memory used for the page table mapping */
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if (pmap->pm_vptpt != 0)
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uvm_km_free(kernel_map, (vaddr_t)pmap->pm_vptpt, NBPG);
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pmap_free_ptpt(pmap);
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/* junk the L1 page table */
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if (pmap->pm_l1pt->pt_flags & PTFLAG_STATIC) {
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