d343041caa
Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
117 lines
3 KiB
C
117 lines
3 KiB
C
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/* This file implements the methods of physically contiguous anonymous memory. */
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#include <assert.h>
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#include "proto.h"
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#include "vm.h"
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#include "region.h"
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#include "glo.h"
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static int anon_contig_reference(struct phys_region *pr);
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static int anon_contig_unreference(struct phys_region *pr);
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static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
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struct phys_region *ph, int write);
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static int anon_contig_sanitycheck(struct phys_region *pr, char *file, int line);
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static int anon_contig_writable(struct phys_region *pr);
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static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l);
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static int anon_contig_new(struct vir_region *vr);
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struct mem_type mem_type_anon_contig = {
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.name = "anonymous memory (physically contiguous)",
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.ev_new = anon_contig_new,
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.ev_reference = anon_contig_reference,
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.ev_unreference = anon_contig_unreference,
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.ev_pagefault = anon_contig_pagefault,
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.ev_resize = anon_contig_resize,
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.ev_sanitycheck = anon_contig_sanitycheck,
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.writable = anon_contig_writable
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};
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static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
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struct phys_region *ph, int write)
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{
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panic("anon_contig_pagefault: pagefault cannot happen");
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}
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static int anon_contig_new(struct vir_region *region)
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{
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u32_t allocflags;
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phys_bytes new_pages, new_page_cl, cur_ph;
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int p, pages;
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physr_iter iter;
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allocflags = vrallocflags(region->flags);
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pages = region->length/VM_PAGE_SIZE;
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assert(physregions(region) == 0);
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for(p = 0; p < pages; p++) {
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struct phys_block *pb = pb_new(MAP_NONE);
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struct phys_region *pr = NULL;
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if(pb)
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pr = pb_reference(pb, p * VM_PAGE_SIZE, region);
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if(!pr) {
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if(pb) pb_free(pb);
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map_free(region);
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return ENOMEM;
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}
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}
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assert(physregions(region) == pages);
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if((new_page_cl = alloc_mem(pages, allocflags)) == NO_MEM) {
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map_free(region);
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return ENOMEM;
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}
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cur_ph = new_pages = CLICK2ABS(new_page_cl);
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physr_start_iter_least(region->phys, &iter);
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for(p = 0; p < pages; p++) {
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struct phys_region *pr = physr_get_iter(&iter);
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assert(pr);
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assert(pr->ph);
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assert(pr->ph->phys == MAP_NONE);
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assert(pr->offset == p * VM_PAGE_SIZE);
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pr->ph->phys = cur_ph + pr->offset;
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physr_incr_iter(&iter);
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}
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assert(!physr_get_iter(&iter));
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return OK;
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}
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static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l)
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{
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printf("VM: cannot resize physically contiguous memory.\n");
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return ENOMEM;
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}
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static int anon_contig_reference(struct phys_region *pr)
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{
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printf("VM: cannot fork with physically contig memory.\n");
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return ENOMEM;
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}
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/* Methods inherited from the anonymous memory methods. */
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static int anon_contig_unreference(struct phys_region *pr)
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{
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return mem_type_anon.ev_unreference(pr);
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}
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static int anon_contig_sanitycheck(struct phys_region *pr, char *file, int line)
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{
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return mem_type_anon.ev_sanitycheck(pr, file, line);
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}
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static int anon_contig_writable(struct phys_region *pr)
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{
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return mem_type_anon.writable(pr);
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}
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