133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
|
|
||
|
/* This file implements the methods of physically contiguous anonymous memory. */
|
||
|
|
||
|
#include <assert.h>
|
||
|
|
||
|
#include "proto.h"
|
||
|
#include "vm.h"
|
||
|
#include "region.h"
|
||
|
#include "glo.h"
|
||
|
|
||
|
static int anon_contig_reference(struct phys_region *, struct phys_region *);
|
||
|
static int anon_contig_unreference(struct phys_region *pr);
|
||
|
static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
|
||
|
struct phys_region *ph, int write, vfs_callback_t cb, void *state,
|
||
|
int len, int *io);
|
||
|
static int anon_contig_sanitycheck(struct phys_region *pr, const char *file, int line);
|
||
|
static int anon_contig_writable(struct phys_region *pr);
|
||
|
static void anon_contig_split(struct vmproc *vmp, struct vir_region *vr,
|
||
|
struct vir_region *r1, struct vir_region *r2);
|
||
|
static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l);
|
||
|
static int anon_contig_new(struct vir_region *vr);
|
||
|
static int anon_contig_pt_flags(struct vir_region *vr);
|
||
|
|
||
|
struct mem_type mem_type_anon_contig = {
|
||
|
.name = "anonymous memory (physically contiguous)",
|
||
|
.ev_new = anon_contig_new,
|
||
|
.ev_reference = anon_contig_reference,
|
||
|
.ev_unreference = anon_contig_unreference,
|
||
|
.ev_pagefault = anon_contig_pagefault,
|
||
|
.ev_resize = anon_contig_resize,
|
||
|
.ev_split = anon_contig_split,
|
||
|
.ev_sanitycheck = anon_contig_sanitycheck,
|
||
|
.writable = anon_contig_writable,
|
||
|
.pt_flags = anon_contig_pt_flags,
|
||
|
};
|
||
|
|
||
|
static int anon_contig_pt_flags(struct vir_region *vr){
|
||
|
#if defined(__arm__)
|
||
|
return ARM_VM_PTE_DEVICE;
|
||
|
#else
|
||
|
return 0;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
|
||
|
struct phys_region *ph, int write, vfs_callback_t cb, void *state,
|
||
|
int len, int *io)
|
||
|
{
|
||
|
panic("anon_contig_pagefault: pagefault cannot happen");
|
||
|
}
|
||
|
|
||
|
static int anon_contig_new(struct vir_region *region)
|
||
|
{
|
||
|
u32_t allocflags;
|
||
|
phys_bytes new_pages, new_page_cl, cur_ph;
|
||
|
phys_bytes p, pages;
|
||
|
|
||
|
allocflags = vrallocflags(region->flags);
|
||
|
|
||
|
pages = region->length/VM_PAGE_SIZE;
|
||
|
|
||
|
assert(physregions(region) == 0);
|
||
|
|
||
|
for(p = 0; p < pages; p++) {
|
||
|
struct phys_block *pb = pb_new(MAP_NONE);
|
||
|
struct phys_region *pr = NULL;
|
||
|
if(pb)
|
||
|
pr = pb_reference(pb, p * VM_PAGE_SIZE, region, &mem_type_anon_contig);
|
||
|
if(!pr) {
|
||
|
if(pb) pb_free(pb);
|
||
|
map_free(region);
|
||
|
return ENOMEM;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
assert(physregions(region) == pages);
|
||
|
|
||
|
if((new_page_cl = alloc_mem(pages, allocflags)) == NO_MEM) {
|
||
|
map_free(region);
|
||
|
return ENOMEM;
|
||
|
}
|
||
|
|
||
|
cur_ph = new_pages = CLICK2ABS(new_page_cl);
|
||
|
|
||
|
for(p = 0; p < pages; p++) {
|
||
|
struct phys_region *pr = physblock_get(region, p * VM_PAGE_SIZE);
|
||
|
assert(pr);
|
||
|
assert(pr->ph);
|
||
|
assert(pr->ph->phys == MAP_NONE);
|
||
|
assert(pr->offset == p * VM_PAGE_SIZE);
|
||
|
pr->ph->phys = cur_ph + pr->offset;
|
||
|
}
|
||
|
|
||
|
return OK;
|
||
|
}
|
||
|
|
||
|
static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l)
|
||
|
{
|
||
|
printf("VM: cannot resize physically contiguous memory.\n");
|
||
|
return ENOMEM;
|
||
|
}
|
||
|
|
||
|
static int anon_contig_reference(struct phys_region *pr,
|
||
|
struct phys_region *newpr)
|
||
|
{
|
||
|
printf("VM: cannot fork with physically contig memory.\n");
|
||
|
return ENOMEM;
|
||
|
}
|
||
|
|
||
|
/* Methods inherited from the anonymous memory methods. */
|
||
|
|
||
|
static int anon_contig_unreference(struct phys_region *pr)
|
||
|
{
|
||
|
return mem_type_anon.ev_unreference(pr);
|
||
|
}
|
||
|
|
||
|
static int anon_contig_sanitycheck(struct phys_region *pr, const char *file, int line)
|
||
|
{
|
||
|
return mem_type_anon.ev_sanitycheck(pr, file, line);
|
||
|
}
|
||
|
|
||
|
static int anon_contig_writable(struct phys_region *pr)
|
||
|
{
|
||
|
return mem_type_anon.writable(pr);
|
||
|
}
|
||
|
|
||
|
static void anon_contig_split(struct vmproc *vmp, struct vir_region *vr,
|
||
|
struct vir_region *r1, struct vir_region *r2)
|
||
|
{
|
||
|
return;
|
||
|
}
|
||
|
|