Allow platform-specific code to define DMA-safe memory ranges for ISA.
If pages being loaded into the VM system intersect with any of these ranges, the intersecting pages will be placed on a lower-priority free list to protect them.
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thorpej
parent
d47ea67c1f
commit
d7d001fe70
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@ -1,4 +1,4 @@
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/* $NetBSD: pmap.c,v 1.27 1998/07/08 00:18:16 mark Exp $ */
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/* $NetBSD: pmap.c,v 1.28 1998/07/08 04:48:20 thorpej Exp $ */
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/*
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* Copyright (c) 1994-1998 Mark Brinicombe.
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@ -77,6 +77,7 @@
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#endif
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#include <machine/bootconfig.h>
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#include <machine/bus.h>
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#include <machine/pmap.h>
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#include <machine/pcb.h>
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#include <machine/param.h>
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@ -185,6 +186,66 @@ pmap_debug(level)
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}
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#endif /* PMAP_DEBUG */
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#include "isadma.h"
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#if NISADMA > 0
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/*
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* Used to protect memory for ISA DMA bounce buffers. If, when loading
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* pages into the system, memory intersects with any of these ranges,
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* the intersecting memory will be loaded into a lower-priority free list.
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*/
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bus_dma_segment_t *pmap_isa_dma_ranges;
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int pmap_isa_dma_nranges;
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boolean_t pmap_isa_dma_range_intersect __P((vm_offset_t, vm_size_t,
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vm_offset_t *, vm_size_t *));
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/*
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* Check if a memory range intersects with an ISA DMA range, and
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* return the page-rounded intersection if it does. The intersection
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* will be placed on a lower-priority free list.
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*/
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boolean_t
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pmap_isa_dma_range_intersect(pa, size, pap, sizep)
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vm_offset_t pa;
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vm_size_t size;
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vm_offset_t *pap;
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vm_size_t *sizep;
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{
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bus_dma_segment_t *ds;
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int i;
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if (pmap_isa_dma_ranges == NULL)
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return (FALSE);
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for (i = 0, ds = pmap_isa_dma_ranges;
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i < pmap_isa_dma_nranges; i++, ds++) {
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if (ds->ds_addr <= pa && pa < (ds->ds_addr + ds->ds_len)) {
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/*
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* Beginning of region intersects with this range.
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*/
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*pap = trunc_page(pa);
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*sizep = round_page(min(pa + size,
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ds->ds_addr + ds->ds_len) - pa);
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return (TRUE);
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}
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if (pa < ds->ds_addr && ds->ds_addr < (pa + size)) {
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/*
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* End of region intersects with this range.
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*/
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*pap = trunc_page(ds->ds_addr);
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*sizep = round_page(min((pa + size) - ds->ds_addr,
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ds->ds_len));
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return (TRUE);
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}
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}
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/*
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* No intersection found.
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*/
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return (FALSE);
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}
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#endif /* NISADMA > 0 */
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/*
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* Functions for manipluation pv_entry structures. These are used to keep a
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@ -589,6 +650,10 @@ pmap_bootstrap(kernel_l1pt, kernel_ptpt)
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{
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int loop;
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vm_offset_t start, end;
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#if defined(UVM) && NISADMA > 0
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vm_offset_t istart;
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vm_size_t isize;
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#endif
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loop = 0;
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while (loop < bootconfig.dramblocks) {
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@ -598,14 +663,68 @@ pmap_bootstrap(kernel_l1pt, kernel_ptpt)
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start = physical_freestart;
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if (end > physical_freeend)
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end = physical_freeend;
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/* printf("%d: %lx -> %lx\n", loop, start, end-1);*/
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#if 0
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printf("%d: %lx -> %lx\n", loop, start, end-1);
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#endif
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#if defined(UVM)
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#if NISADMA > 0
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if (pmap_isa_dma_range_intersect(start, end - start,
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&istart, &isize)) {
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/*
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* Place the pages that intersect with the
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* ISA DMA range onto the ISA DMA free list.
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*/
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#if 0
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printf(" ISADMA 0x%lx -> 0x%lx\n",
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istart, istart + isize - 1);
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#endif
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uvm_page_physload(atop(istart),
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atop(istart + isize), atop(istart),
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atop(istart + isize),
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VM_FREELIST_ISADMA);
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/*
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* Load the pieces that come before
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* the intersection into the default
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* free list.
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*/
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if (start < istart) {
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#if 0
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printf(" BEFORE 0x%lx -> 0x%lx\n",
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start, istart - 1);
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#endif
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uvm_page_physload(atop(start),
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atop(istart), atop(start),
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atop(istart), VM_FREELIST_DEFAULT);
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}
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/*
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* Load the pieces that come after
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* the intersection into the default
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* free list.
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*/
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if ((istart + isize) < end) {
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#if 0
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printf(" AFTER 0x%lx -> 0x%lx\n",
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(istart + isize), end - 1);
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#endif
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uvm_page_physload(atop(istart + isize),
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atop(end), atop(istart + isize),
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atop(end), VM_FREELIST_DEFAULT);
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}
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} else {
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uvm_page_physload(atop(start), atop(end),
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atop(start), atop(end));
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atop(start), atop(end),
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VM_FREELIST_DEFAULT);
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}
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#else
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uvm_page_physload(atop(start), atop(end),
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atop(start), atop(end), VM_FREELIST_DEFAULT);
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#endif /* NISADMA > 0 */
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#else
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vm_page_physload(atop(start), atop(end),
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atop(start), atop(end));
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#endif
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#endif /* UVM */
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++loop;
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}
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}
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