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minix/servers/vm/region.c
Ben Gras 449ed17833 VM: shared memory pagefault fix 
. if there is no memory there, it's not writable; this
	  check bug by the shared memory's writable() method causes
	  pagefaults not to be handled  at all in certain situations,
	  triggering an assert() in pt_writemap()
	. added some assert()s to catch this and similar situations
	  in the future

Change-Id: Ife89bfab4f9a3aa7bf4e33dfb0b13b89dcd5bb94
2013-03-07 10:40:22 +01:00

1936 lines
47 KiB
C
Raw Blame History

#include <minix/com.h>
#include <minix/callnr.h>
#include <minix/type.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/debug.h>
#include <minix/bitmap.h>
#include <minix/hash.h>
#include <machine/multiboot.h>
#include <sys/mman.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdint.h>
#include <sys/param.h>
#include "vm.h"
#include "proto.h"
#include "util.h"
#include "glo.h"
#include "region.h"
#include "sanitycheck.h"
#include "yieldedavl.h"
#include "memlist.h"
#include "memtype.h"
/* LRU list. */
static yielded_t *lru_youngest = NULL, *lru_oldest = NULL;
static int map_ph_writept(struct vmproc *vmp, struct vir_region *vr,
struct phys_region *pr);
static phys_bytes freeyieldednode(yielded_t *node, int freemem);
static struct vir_region *map_copy_region(struct vmproc *vmp, struct
vir_region *vr);
#if SANITYCHECKS
static void lrucheck(void);
#endif
/* hash table of yielded blocks */
#define YIELD_HASHSIZE 65536
static yielded_avl vm_yielded_blocks[YIELD_HASHSIZE];
static int avl_inited = 0;
void map_region_init(void)
{
int h;
assert(!avl_inited);
for(h = 0; h < YIELD_HASHSIZE; h++)
yielded_init(&vm_yielded_blocks[h]);
avl_inited = 1;
}
static yielded_avl *get_yielded_avl(block_id_t id)
{
u32_t h;
assert(avl_inited);
hash_i_64(id.owner, id.id, h);
h = h % YIELD_HASHSIZE;
assert(h >= 0);
assert(h < YIELD_HASHSIZE);
return &vm_yielded_blocks[h];
}
void map_printregion(struct vir_region *vr)
{
int i;
struct phys_region *ph;
printf("map_printmap: map_name: %s\n", vr->memtype->name);
printf("\t%lx (len 0x%lx, %lukB), %p\n",
vr->vaddr, vr->length, vr->length/1024, vr->memtype->name);
printf("\t\tphysblocks:\n");
for(i = 0; i < vr->length/VM_PAGE_SIZE; i++) {
if(!(ph=vr->physblocks[i])) continue;
printf("\t\t@ %lx (refs %d): phys 0x%lx\n",
(vr->vaddr + ph->offset),
ph->ph->refcount, ph->ph->phys);
}
}
struct phys_region *physblock_get(struct vir_region *region, vir_bytes offset)
{
int i;
struct phys_region *foundregion;
assert(!(offset % VM_PAGE_SIZE));
assert(offset >= 0 && offset < region->length);
i = offset/VM_PAGE_SIZE;
if((foundregion = region->physblocks[i]))
assert(foundregion->offset == offset);
return foundregion;
}
void physblock_set(struct vir_region *region, vir_bytes offset,
struct phys_region *newphysr)
{
int i;
assert(!(offset % VM_PAGE_SIZE));
assert(offset >= 0 && offset < region->length);
i = offset/VM_PAGE_SIZE;
if(newphysr) {
assert(!region->physblocks[i]);
assert(newphysr->offset == offset);
} else {
assert(region->physblocks[i]);
}
region->physblocks[i] = newphysr;
}
/*===========================================================================*
* map_printmap *
*===========================================================================*/
void map_printmap(vmp)
struct vmproc *vmp;
{
struct vir_region *vr;
region_iter iter;
printf("memory regions in process %d:\n", vmp->vm_endpoint);
region_start_iter_least(&vmp->vm_regions_avl, &iter);
while((vr = region_get_iter(&iter))) {
map_printregion(vr);
region_incr_iter(&iter);
}
}
static struct vir_region *getnextvr(struct vir_region *vr)
{
struct vir_region *nextvr;
region_iter v_iter;
SLABSANE(vr);
region_start_iter(&vr->parent->vm_regions_avl, &v_iter, vr->vaddr, AVL_EQUAL);
assert(region_get_iter(&v_iter));
assert(region_get_iter(&v_iter) == vr);
region_incr_iter(&v_iter);
nextvr = region_get_iter(&v_iter);
if(!nextvr) return NULL;
SLABSANE(nextvr);
assert(vr->parent == nextvr->parent);
assert(vr->vaddr < nextvr->vaddr);
assert(vr->vaddr + vr->length <= nextvr->vaddr);
return nextvr;
}
int pr_writable(struct vir_region *vr, struct phys_region *pr)
{
assert(vr->memtype->writable);
return ((vr->flags & VR_WRITABLE) && vr->memtype->writable(pr));
}
#if SANITYCHECKS
/*===========================================================================*
* map_sanitycheck_pt *
*===========================================================================*/
static int map_sanitycheck_pt(struct vmproc *vmp,
struct vir_region *vr, struct phys_region *pr)
{
struct phys_block *pb = pr->ph;
int rw;
int r;
if(pr_writable(vr, pr))
rw = PTF_WRITE;
else
rw = PTF_READ;
r = pt_writemap(vmp, &vmp->vm_pt, vr->vaddr + pr->offset,
pb->phys, VM_PAGE_SIZE, PTF_PRESENT | PTF_USER | rw, WMF_VERIFY);
if(r != OK) {
printf("proc %d phys_region 0x%lx sanity check failed\n",
vmp->vm_endpoint, pr->offset);
map_printregion(vr);
}
return r;
}
/*===========================================================================*
* map_sanitycheck *
*===========================================================================*/
void map_sanitycheck(char *file, int line)
{
struct vmproc *vmp;
lrucheck();
/* Macro for looping over all physical blocks of all regions of
* all processes.
*/
#define ALLREGIONS(regioncode, physcode) \
for(vmp = vmproc; vmp < &vmproc[VMP_NR]; vmp++) { \
vir_bytes voffset; \
region_iter v_iter; \
struct vir_region *vr; \
if(!(vmp->vm_flags & VMF_INUSE)) \
continue; \
region_start_iter_least(&vmp->vm_regions_avl, &v_iter); \
while((vr = region_get_iter(&v_iter))) { \
struct phys_region *pr; \
regioncode; \
for(voffset = 0; voffset < vr->length; \
voffset += VM_PAGE_SIZE) { \
if(!(pr = physblock_get(vr, voffset))) \
continue; \
physcode; \
} \
region_incr_iter(&v_iter); \
} \
}
#define MYSLABSANE(s) MYASSERT(slabsane_f(__FILE__, __LINE__, s, sizeof(*(s))))
/* Basic pointers check. */
ALLREGIONS(MYSLABSANE(vr),MYSLABSANE(pr); MYSLABSANE(pr->ph);MYSLABSANE(pr->parent));
ALLREGIONS(/* MYASSERT(vr->parent == vmp) */,MYASSERT(pr->parent == vr););
/* Do counting for consistency check. */
ALLREGIONS(;,USE(pr->ph, pr->ph->seencount = 0;););
ALLREGIONS(;,MYASSERT(pr->offset == voffset););
ALLREGIONS(;,USE(pr->ph, pr->ph->seencount++;);
if(pr->ph->seencount == 1) {
if(pr->parent->memtype->ev_sanitycheck)
pr->parent->memtype->ev_sanitycheck(pr, file, line);
}
);
/* Do consistency check. */
ALLREGIONS({ struct vir_region *nextvr = getnextvr(vr);
if(nextvr) {
MYASSERT(vr->vaddr < nextvr->vaddr);
MYASSERT(vr->vaddr + vr->length <= nextvr->vaddr);
}
}
MYASSERT(!(vr->vaddr % VM_PAGE_SIZE));,
if(pr->ph->refcount != pr->ph->seencount) {
map_printmap(vmp);
printf("ph in vr %p: 0x%lx refcount %u "
"but seencount %u\n",
vr, pr->offset,
pr->ph->refcount, pr->ph->seencount);
}
{
int n_others = 0;
struct phys_region *others;
if(pr->ph->refcount > 0) {
MYASSERT(pr->ph->firstregion);
if(pr->ph->refcount == 1) {
MYASSERT(pr->ph->firstregion == pr);
}
} else {
MYASSERT(!pr->ph->firstregion);
}
for(others = pr->ph->firstregion; others;
others = others->next_ph_list) {
MYSLABSANE(others);
MYASSERT(others->ph == pr->ph);
n_others++;
}
MYASSERT(pr->ph->refcount == n_others);
}
MYASSERT(pr->ph->refcount == pr->ph->seencount);
MYASSERT(!(pr->offset % VM_PAGE_SIZE)););
ALLREGIONS(,MYASSERT(map_sanitycheck_pt(vmp, vr, pr) == OK));
}
#define LRUCHECK lrucheck()
static void lrucheck(void)
{
yielded_t *list;
/* list is empty and ok if both ends point to null. */
if(!lru_youngest && !lru_oldest)
return;
/* if not, both should point to something. */
SLABSANE(lru_youngest);
SLABSANE(lru_oldest);
assert(!lru_youngest->younger);
assert(!lru_oldest->older);
for(list = lru_youngest; list; list = list->older) {
SLABSANE(list);
if(list->younger) {
SLABSANE(list->younger);
assert(list->younger->older == list);
} else assert(list == lru_youngest);
if(list->older) {
SLABSANE(list->older);
assert(list->older->younger == list);
} else assert(list == lru_oldest);
}
}
void blockstats(void)
{
yielded_t *list;
int blocks = 0;
phys_bytes mem = 0;
clock_t ticks;
int s;
s = getuptime(&ticks);
assert(s == OK);
LRUCHECK;
for(list = lru_youngest; list; list = list->older) {
mem += VM_PAGE_SIZE;
blocks++;
}
if(blocks > 0)
printf("%d blocks, %lukB; ", blocks, mem/1024);
printmemstats();
}
#else
#define LRUCHECK
#endif
/*=========================================================================*
* map_ph_writept *
*=========================================================================*/
static int map_ph_writept(struct vmproc *vmp, struct vir_region *vr,
struct phys_region *pr)
{
int flags = PTF_PRESENT | PTF_USER;
struct phys_block *pb = pr->ph;
assert(vr);
assert(pr);
assert(pb);
assert(!(vr->vaddr % VM_PAGE_SIZE));
assert(!(pr->offset % VM_PAGE_SIZE));
assert(pb->refcount > 0);
if(pr_writable(vr, pr))
flags |= PTF_WRITE;
else
flags |= PTF_READ;
#if defined(__arm__)
if (pb->phys >= 0x80000000 && pb->phys < (0xc0000000 - VM_PAGE_SIZE)) {
// LSC Do this only for actual RAM
flags |= ARM_VM_PTE_WT;
}
#endif
if(pt_writemap(vmp, &vmp->vm_pt, vr->vaddr + pr->offset,
pb->phys, VM_PAGE_SIZE, flags,
#if SANITYCHECKS
!pr->written ? 0 :
#endif
WMF_OVERWRITE) != OK) {
printf("VM: map_writept: pt_writemap failed\n");
return ENOMEM;
}
#if SANITYCHECKS
USE(pr, pr->written = 1;);
#endif
return OK;
}
#define SLOT_FAIL ((vir_bytes) -1)
/*===========================================================================*
* region_find_slot_range *
*===========================================================================*/
static vir_bytes region_find_slot_range(struct vmproc *vmp,
vir_bytes minv, vir_bytes maxv, vir_bytes length)
{
struct vir_region *lastregion;
vir_bytes startv = 0;
int foundflag = 0;
region_iter iter;
SANITYCHECK(SCL_FUNCTIONS);
/* Length must be reasonable. */
assert(length > 0);
/* Special case: allow caller to set maxv to 0 meaning 'I want
* it to be mapped in right here.'
*/
if(maxv == 0) {
maxv = minv + length;
/* Sanity check. */
if(maxv <= minv) {
printf("region_find_slot: minv 0x%lx and bytes 0x%lx\n",
minv, length);
return SLOT_FAIL;
}
}
/* Basic input sanity checks. */
assert(!(length % VM_PAGE_SIZE));
if(minv >= maxv) {
printf("VM: 1 minv: 0x%lx maxv: 0x%lx length: 0x%lx\n",
minv, maxv, length);
}
assert(minv < maxv);
if(minv + length > maxv)
return SLOT_FAIL;
#define FREEVRANGE_TRY(rangestart, rangeend) { \
vir_bytes frstart = (rangestart), frend = (rangeend); \
frstart = MAX(frstart, minv); \
frend = MIN(frend, maxv); \
if(frend > frstart && (frend - frstart) >= length) { \
startv = frend-length; \
foundflag = 1; \
} }
#define FREEVRANGE(start, end) { \
assert(!foundflag); \
FREEVRANGE_TRY(((start)+VM_PAGE_SIZE), ((end)-VM_PAGE_SIZE)); \
if(!foundflag) { \
FREEVRANGE_TRY((start), (end)); \
} \
}
/* find region after maxv. */
region_start_iter(&vmp->vm_regions_avl, &iter, maxv, AVL_GREATER_EQUAL);
lastregion = region_get_iter(&iter);
if(!lastregion) {
/* This is the free virtual address space after the last region. */
region_start_iter(&vmp->vm_regions_avl, &iter, maxv, AVL_LESS);
lastregion = region_get_iter(&iter);
FREEVRANGE(lastregion ?
lastregion->vaddr+lastregion->length : 0, VM_DATATOP);
}
if(!foundflag) {
struct vir_region *vr;
while((vr = region_get_iter(&iter)) && !foundflag) {
struct vir_region *nextvr;
region_decr_iter(&iter);
nextvr = region_get_iter(&iter);
FREEVRANGE(nextvr ? nextvr->vaddr+nextvr->length : 0,
vr->vaddr);
}
}
if(!foundflag) {
return SLOT_FAIL;
}
/* However we got it, startv must be in the requested range. */
assert(startv >= minv);
assert(startv < maxv);
assert(startv + length <= maxv);
/* remember this position as a hint for next time. */
vmp->vm_region_top = startv + length;
return startv;
}
/*===========================================================================*
* region_find_slot *
*===========================================================================*/
static vir_bytes region_find_slot(struct vmproc *vmp,
vir_bytes minv, vir_bytes maxv, vir_bytes length)
{
vir_bytes v, hint = vmp->vm_region_top;
/* use the top of the last inserted region as a minv hint if
* possible. remember that a zero maxv is a special case.
*/
if(maxv && hint < maxv && hint >= minv) {
v = region_find_slot_range(vmp, minv, hint, length);
if(v != SLOT_FAIL)
return v;
}
return region_find_slot_range(vmp, minv, maxv, length);
}
static int phys_slot(vir_bytes len)
{
assert(!(len % VM_PAGE_SIZE));
return len / VM_PAGE_SIZE;
}
struct vir_region *region_new(struct vmproc *vmp, vir_bytes startv, vir_bytes length,
int flags, mem_type_t *memtype)
{
struct vir_region *newregion;
struct phys_region **physregions;
static u32_t id;
int slots = phys_slot(length);
if(!(SLABALLOC(newregion))) {
printf("vm: region_new: could not allocate\n");
return NULL;
}
/* Fill in node details. */
USE(newregion,
memset(newregion, 0, sizeof(*newregion));
newregion->vaddr = startv;
newregion->length = length;
newregion->flags = flags;
newregion->memtype = memtype;
newregion->remaps = 0;
newregion->id = id++;
newregion->lower = newregion->higher = NULL;
newregion->parent = vmp;);
if(!(physregions = calloc(slots, sizeof(struct phys_region *)))) {
printf("VM: region_new: allocating phys blocks failed\n");
SLABFREE(newregion);
return NULL;
}
USE(newregion, newregion->physblocks = physregions;);
return newregion;
}
/*===========================================================================*
* map_page_region *
*===========================================================================*/
struct vir_region *map_page_region(vmp, minv, maxv, length,
flags, mapflags, memtype)
struct vmproc *vmp;
vir_bytes minv;
vir_bytes maxv;
vir_bytes length;
u32_t flags;
int mapflags;
mem_type_t *memtype;
{
struct vir_region *newregion;
vir_bytes startv;
assert(!(length % VM_PAGE_SIZE));
SANITYCHECK(SCL_FUNCTIONS);
startv = region_find_slot(vmp, minv, maxv, length);
if (startv == SLOT_FAIL)
return NULL;
/* Now we want a new region. */
if(!(newregion = region_new(vmp, startv, length, flags, memtype))) {
printf("VM: map_page_region: allocating region failed\n");
return NULL;
}
/* If a new event is specified, invoke it. */
if(newregion->memtype->ev_new) {
if(newregion->memtype->ev_new(newregion) != OK) {
/* ev_new will have freed and removed the region */
return NULL;
}
}
if(mapflags & MF_PREALLOC) {
if(map_handle_memory(vmp, newregion, 0, length, 1) != OK) {
printf("VM: map_page_region: prealloc failed\n");
free(newregion->physblocks);
USE(newregion,
newregion->physblocks = NULL;);
SLABFREE(newregion);
return NULL;
}
}
/* Pre-allocations should be uninitialized, but after that it's a
* different story.
*/
USE(newregion, newregion->flags &= ~VR_UNINITIALIZED;);
/* Link it. */
region_insert(&vmp->vm_regions_avl, newregion);
#if SANITYCHECKS
assert(startv == newregion->vaddr);
{
struct vir_region *nextvr;
if((nextvr = getnextvr(newregion))) {
assert(newregion->vaddr < nextvr->vaddr);
}
}
#endif
SANITYCHECK(SCL_FUNCTIONS);
return newregion;
}
/*===========================================================================*
* map_subfree *
*===========================================================================*/
static int map_subfree(struct vir_region *region,
vir_bytes start, vir_bytes len)
{
struct phys_region *pr;
vir_bytes end = start+len;
vir_bytes voffset;
#if SANITYCHECKS
SLABSANE(region);
for(voffset = 0; voffset < phys_slot(region->length);
voffset += VM_PAGE_SIZE) {
struct phys_region *others;
struct phys_block *pb;
if(!(pr = physblock_get(region, voffset)))
continue;
pb = pr->ph;
for(others = pb->firstregion; others;
others = others->next_ph_list) {
assert(others->ph == pb);
}
}
#endif
for(voffset = start; voffset < end; voffset+=VM_PAGE_SIZE) {
if(!(pr = physblock_get(region, voffset)))
continue;
assert(pr->offset >= start);
assert(pr->offset < end);
pb_unreferenced(region, pr, 1);
SLABFREE(pr);
}
return OK;
}
/*===========================================================================*
* map_free *
*===========================================================================*/
int map_free(struct vir_region *region)
{
int r;
if((r=map_subfree(region, 0, region->length)) != OK) {
printf("%d\n", __LINE__);
return r;
}
if(region->memtype->ev_delete)
region->memtype->ev_delete(region);
free(region->physblocks);
region->physblocks = NULL;
SLABFREE(region);
return OK;
}
/*===========================================================================*
* yielded_block_cmp *
*===========================================================================*/
int yielded_block_cmp(struct block_id *id1, struct block_id *id2)
{
if(id1->owner < id2->owner)
return -1;
if(id1->owner > id2->owner)
return 1;
return cmp64(id1->id, id2->id);
}
/*===========================================================================*
* free_yielded_proc *
*===========================================================================*/
static vir_bytes free_yielded_proc(struct vmproc *vmp)
{
vir_bytes total = 0;
int h;
SANITYCHECK(SCL_FUNCTIONS);
/* Free associated regions. */
for(h = 0; h < YIELD_HASHSIZE && vmp->vm_yielded > 0; h++) {
yielded_t *yb;
yielded_iter iter;
yielded_avl *avl = &vm_yielded_blocks[h];
yielded_start_iter_least(avl, &iter);
while((yb = yielded_get_iter(&iter))) {
yielded_t *next_yb;
SLABSANE(yb);
yielded_incr_iter(&iter);
if(yb->id.owner != vmp->vm_endpoint)
continue;
next_yb = yielded_get_iter(&iter);
total += freeyieldednode(yb, 1);
/* the above removal invalidated our iter; restart it
* for the node we want to start at.
*/
if(!next_yb) break;
yielded_start_iter(avl, &iter, next_yb->id, AVL_EQUAL);
assert(yielded_get_iter(&iter) == next_yb);
}
}
return total;
}
static phys_bytes freeyieldednode(yielded_t *node, int freemem)
{
yielded_t *older, *younger, *removed;
yielded_avl *avl;
int p;
SLABSANE(node);
LRUCHECK;
/* Update LRU. */
younger = node->younger;
older = node->older;
if(younger) {
SLABSANE(younger);
assert(younger->older == node);
USE(younger, younger->older = node->older;);
} else {
assert(node == lru_youngest);
lru_youngest = node->older;
}
if(older) {
SLABSANE(older);
assert(older->younger == node);
USE(older, older->younger = node->younger;);
} else {
assert(node == lru_oldest);
lru_oldest = node->younger;
}
LRUCHECK;
/* Update AVL. */
if(vm_isokendpt(node->id.owner, &p) != OK)
panic("out of date owner of yielded block %d", node->id.owner);
avl = get_yielded_avl(node->id);
removed = yielded_remove(avl, node->id);
assert(removed == node);
assert(vmproc[p].vm_yielded > 0);
vmproc[p].vm_yielded--;
/* Free associated memory if requested. */
if(freemem) {
free_mem(ABS2CLICK(node->physaddr), node->pages);
}
/* Free node. */
SLABFREE(node);
return VM_PAGE_SIZE;
}
/*========================================================================*
* free_yielded *
*========================================================================*/
vir_bytes free_yielded(vir_bytes max_bytes)
{
/* PRIVATE yielded_t *lru_youngest = NULL, *lru_oldest = NULL; */
vir_bytes freed = 0;
int blocks = 0;
while(freed < max_bytes && lru_oldest) {
SLABSANE(lru_oldest);
freed += freeyieldednode(lru_oldest, 1);
blocks++;
}
return freed;
}
/*========================================================================*
* map_free_proc *
*========================================================================*/
int map_free_proc(vmp)
struct vmproc *vmp;
{
struct vir_region *r;
while((r = region_search_root(&vmp->vm_regions_avl))) {
SANITYCHECK(SCL_DETAIL);
#if SANITYCHECKS
nocheck++;
#endif
region_remove(&vmp->vm_regions_avl, r->vaddr); /* For sanity checks. */
map_free(r);
#if SANITYCHECKS
nocheck--;
#endif
SANITYCHECK(SCL_DETAIL);
}
region_init(&vmp->vm_regions_avl);
/* Free associated yielded blocks. */
free_yielded_proc(vmp);
SANITYCHECK(SCL_FUNCTIONS);
return OK;
}
/*===========================================================================*
* map_lookup *
*===========================================================================*/
struct vir_region *map_lookup(vmp, offset, physr)
struct vmproc *vmp;
vir_bytes offset;
struct phys_region **physr;
{
struct vir_region *r;
SANITYCHECK(SCL_FUNCTIONS);
#if SANITYCHECKS
if(!region_search_root(&vmp->vm_regions_avl))
panic("process has no regions: %d", vmp->vm_endpoint);
#endif
if((r = region_search(&vmp->vm_regions_avl, offset, AVL_LESS_EQUAL))) {
vir_bytes ph;
if(offset >= r->vaddr && offset < r->vaddr + r->length) {
ph = offset - r->vaddr;
if(physr) {
*physr = physblock_get(r, ph);
if(*physr) assert((*physr)->offset == ph);
}
return r;
}
}
SANITYCHECK(SCL_FUNCTIONS);
return NULL;
}
u32_t vrallocflags(u32_t flags)
{
u32_t allocflags = 0;
if(flags & VR_PHYS64K)
allocflags |= PAF_ALIGN64K;
if(flags & VR_LOWER16MB)
allocflags |= PAF_LOWER16MB;
if(flags & VR_LOWER1MB)
allocflags |= PAF_LOWER1MB;
if(flags & VR_CONTIG)
allocflags |= PAF_CONTIG;
if(!(flags & VR_UNINITIALIZED))
allocflags |= PAF_CLEAR;
return allocflags;
}
/*===========================================================================*
* map_clone_ph_block *
*===========================================================================*/
struct phys_region *map_clone_ph_block(vmp, region, ph)
struct vmproc *vmp;
struct vir_region *region;
struct phys_region *ph;
{
vir_bytes offset;
u32_t allocflags;
phys_bytes physaddr;
struct phys_region *newpr;
int region_has_single_block;
SANITYCHECK(SCL_FUNCTIONS);
/* Warning: this function will free the passed
* phys_region *ph and replace it (in the same offset)
* with another! So both the pointer to it
* and any iterators over the phys_regions in the vir_region
* will be invalid on successful return. (Iterators over
* the vir_region could be invalid on unsuccessful return too.)
*/
/* This is only to be done if there is more than one copy. */
assert(ph->ph->refcount > 1);
/* This function takes a physical block, copies its contents
* into newly allocated memory, and replaces the single physical
* block by one or more physical blocks with refcount 1 with the
* same contents as the original. In other words, a fragmentable
* version of map_copy_ph_block().
*/
/* Remember where and how much. */
offset = ph->offset;
physaddr = ph->ph->phys;
/* Now unlink the original physical block so we can replace
* it with new ones.
*/
SLABSANE(ph);
SLABSANE(ph->ph);
assert(ph->ph->refcount > 1);
pb_unreferenced(region, ph, 1);
SLABFREE(ph);
SANITYCHECK(SCL_DETAIL);
/* Put new free memory in. */
allocflags = vrallocflags(region->flags | VR_UNINITIALIZED);
region_has_single_block = (offset == 0 && region->length == VM_PAGE_SIZE);
assert(region_has_single_block || !(allocflags & PAF_CONTIG));
assert(!(allocflags & PAF_CLEAR));
if(map_pf(vmp, region, offset, 1) != OK) {
/* XXX original range now gone. */
printf("VM: map_clone_ph_block: map_pf failed.\n");
return NULL;
}
/* Copy the block to the new memory.
* Can only fail if map_new_physblock didn't do what we asked.
*/
if(copy_abs2region(physaddr, region, offset, VM_PAGE_SIZE) != OK)
panic("copy_abs2region failed, no good reason for that");
newpr = physblock_get(region, offset);
assert(newpr);
assert(newpr->offset == offset);
SANITYCHECK(SCL_FUNCTIONS);
return newpr;
}
/*===========================================================================*
* map_pf *
*===========================================================================*/
int map_pf(vmp, region, offset, write)
struct vmproc *vmp;
struct vir_region *region;
vir_bytes offset;
int write;
{
struct phys_region *ph;
int r = OK;
offset -= offset % VM_PAGE_SIZE;
assert(offset >= 0);
assert(offset < region->length);
assert(!(region->vaddr % VM_PAGE_SIZE));
assert(!(write && !(region->flags & VR_WRITABLE)));
SANITYCHECK(SCL_FUNCTIONS);
if(!(ph = physblock_get(region, offset))) {
struct phys_block *pb;
/* New block. */
if(!(pb = pb_new(MAP_NONE))) {
printf("map_pf: pb_new failed\n");
return ENOMEM;
}
if(!(ph = pb_reference(pb, offset, region))) {
printf("map_pf: pb_reference failed\n");
pb_free(pb);
return ENOMEM;
}
}
assert(ph);
assert(ph->ph);
/* If we're writing and the block is already
* writable, nothing to do.
*/
assert(region->memtype->writable);
if(!write || !region->memtype->writable(ph)) {
assert(region->memtype->ev_pagefault);
assert(ph->ph);
if((r = region->memtype->ev_pagefault(vmp,
region, ph, write)) == SUSPEND) {
panic("map_pf: memtype->ev_pagefault returned SUSPEND\n");
return SUSPEND;
}
if(r != OK) {
printf("map_pf: memtype->ev_pagefault failed\n");
if(ph)
pb_unreferenced(region, ph, 1);
return r;
}
assert(ph);
assert(ph->ph);
assert(ph->ph->phys != MAP_NONE);
}
assert(ph->ph);
assert(ph->ph->phys != MAP_NONE);
if((r = map_ph_writept(vmp, region, ph)) != OK) {
printf("map_pf: writept failed\n");
return r;
}
SANITYCHECK(SCL_FUNCTIONS);
#if SANITYCHECKS
if(OK != pt_checkrange(&vmp->vm_pt, region->vaddr+offset,
VM_PAGE_SIZE, write)) {
panic("map_pf: pt_checkrange failed: %d", r);
}
#endif
return r;
}
int map_handle_memory(vmp, region, start_offset, length, write)
struct vmproc *vmp;
struct vir_region *region;
vir_bytes start_offset;
vir_bytes length;
int write;
{
vir_bytes offset, lim;
int r;
assert(length > 0);
lim = start_offset + length;
assert(lim > start_offset);
for(offset = start_offset; offset < lim; offset += VM_PAGE_SIZE)
if((r = map_pf(vmp, region, offset, write)) != OK)
return r;
return OK;
}
/*===========================================================================*
* map_pin_memory *
*===========================================================================*/
int map_pin_memory(struct vmproc *vmp)
{
struct vir_region *vr;
int r;
region_iter iter;
region_start_iter_least(&vmp->vm_regions_avl, &iter);
/* Scan all memory regions. */
while((vr = region_get_iter(&iter))) {
/* Make sure region is mapped to physical memory and writable.*/
r = map_handle_memory(vmp, vr, 0, vr->length, 1);
if(r != OK) {
panic("map_pin_memory: map_handle_memory failed: %d", r);
}
region_incr_iter(&iter);
}
return OK;
}
/*===========================================================================*
* map_copy_region *
*===========================================================================*/
static struct vir_region *map_copy_region(struct vmproc *vmp, struct vir_region *vr)
{
/* map_copy_region creates a complete copy of the vir_region
* data structure, linking in the same phys_blocks directly,
* but all in limbo, i.e., the caller has to link the vir_region
* to a process. Therefore it doesn't increase the refcount in
* the phys_block; the caller has to do this once it's linked.
* The reason for this is to keep the sanity checks working
* within this function.
*/
struct vir_region *newvr;
struct phys_region *ph;
int r;
#if SANITYCHECKS
int cr;
cr = physregions(vr);
#endif
vir_bytes p;
if(!(newvr = region_new(vr->parent, vr->vaddr, vr->length, vr->flags, vr->memtype)))
return NULL;
if(vr->memtype->ev_copy && (r=vr->memtype->ev_copy(vr, newvr)) != OK) {
map_free(newvr);
printf("VM: memtype-specific copy failed (%d)\n", r);
return NULL;
}
for(p = 0; p < phys_slot(vr->length); p++) {
if(!(ph = physblock_get(vr, p*VM_PAGE_SIZE))) continue;
struct phys_region *newph = pb_reference(ph->ph, ph->offset, newvr);
if(!newph) { map_free(newvr); return NULL; }
#if SANITYCHECKS
USE(newph, newph->written = 0;);
assert(physregions(vr) == cr);
#endif
}
#if SANITYCHECKS
assert(physregions(vr) == physregions(newvr));
#endif
return newvr;
}
/*===========================================================================*
* copy_abs2region *
*===========================================================================*/
int copy_abs2region(phys_bytes abs, struct vir_region *destregion,
phys_bytes offset, phys_bytes len)
{
assert(destregion);
assert(destregion->physblocks);
while(len > 0) {
phys_bytes sublen, suboffset;
struct phys_region *ph;
assert(destregion);
assert(destregion->physblocks);
if(!(ph = physblock_get(destregion, offset))) {
printf("VM: copy_abs2region: no phys region found (1).\n");
return EFAULT;
}
assert(ph->offset <= offset);
if(ph->offset+VM_PAGE_SIZE <= offset) {
printf("VM: copy_abs2region: no phys region found (2).\n");
return EFAULT;
}
suboffset = offset - ph->offset;
assert(suboffset < VM_PAGE_SIZE);
sublen = len;
if(sublen > VM_PAGE_SIZE - suboffset)
sublen = VM_PAGE_SIZE - suboffset;
assert(suboffset + sublen <= VM_PAGE_SIZE);
if(ph->ph->refcount != 1) {
printf("VM: copy_abs2region: refcount not 1.\n");
return EFAULT;
}
if(sys_abscopy(abs, ph->ph->phys + suboffset, sublen) != OK) {
printf("VM: copy_abs2region: abscopy failed.\n");
return EFAULT;
}
abs += sublen;
offset += sublen;
len -= sublen;
}
return OK;
}
/*=========================================================================*
* map_writept *
*=========================================================================*/
int map_writept(struct vmproc *vmp)
{
struct vir_region *vr;
struct phys_region *ph;
int r;
region_iter v_iter;
region_start_iter_least(&vmp->vm_regions_avl, &v_iter);
while((vr = region_get_iter(&v_iter))) {
vir_bytes p;
for(p = 0; p < vr->length; p += VM_PAGE_SIZE) {
if(!(ph = physblock_get(vr, p))) continue;
if((r=map_ph_writept(vmp, vr, ph)) != OK) {
printf("VM: map_writept: failed\n");
return r;
}
}
region_incr_iter(&v_iter);
}
return OK;
}
/*========================================================================*
* map_proc_copy *
*========================================================================*/
int map_proc_copy(dst, src)
struct vmproc *dst;
struct vmproc *src;
{
/* Copy all the memory regions from the src process to the dst process. */
region_init(&dst->vm_regions_avl);
return map_proc_copy_from(dst, src, NULL);
}
/*========================================================================*
* map_proc_copy_from *
*========================================================================*/
int map_proc_copy_from(dst, src, start_src_vr)
struct vmproc *dst;
struct vmproc *src;
struct vir_region *start_src_vr;
{
struct vir_region *vr;
region_iter v_iter;
if(!start_src_vr)
start_src_vr = region_search_least(&src->vm_regions_avl);
assert(start_src_vr);
assert(start_src_vr->parent == src);
region_start_iter(&src->vm_regions_avl, &v_iter,
start_src_vr->vaddr, AVL_EQUAL);
assert(region_get_iter(&v_iter) == start_src_vr);
/* Copy source regions after the destination's last region (if any). */
SANITYCHECK(SCL_FUNCTIONS);
while((vr = region_get_iter(&v_iter))) {
struct vir_region *newvr;
if(!(newvr = map_copy_region(dst, vr))) {
map_free_proc(dst);
return ENOMEM;
}
USE(newvr, newvr->parent = dst;);
region_insert(&dst->vm_regions_avl, newvr);
assert(vr->length == newvr->length);
#if SANITYCHECKS
{
vir_bytes vaddr;
struct phys_region *orig_ph, *new_ph;
assert(vr->physblocks != newvr->physblocks);
for(vaddr = 0; vaddr < vr->length; vaddr += VM_PAGE_SIZE) {
orig_ph = physblock_get(vr, vaddr);
new_ph = physblock_get(newvr, vaddr);
if(!orig_ph) { assert(!new_ph); continue;}
assert(new_ph);
assert(orig_ph != new_ph);
assert(orig_ph->ph == new_ph->ph);
}
}
#endif
region_incr_iter(&v_iter);
}
map_writept(src);
map_writept(dst);
SANITYCHECK(SCL_FUNCTIONS);
return OK;
}
int map_region_extend_upto_v(struct vmproc *vmp, vir_bytes v)
{
vir_bytes offset = v;
struct vir_region *vr, *nextvr;
struct phys_region **newpr;
int newslots, prevslots, addedslots;
offset = roundup(offset, VM_PAGE_SIZE);
if(!(vr = region_search(&vmp->vm_regions_avl, offset, AVL_LESS))) {
printf("VM: nothing to extend\n");
return ENOMEM;
}
if(vr->vaddr + vr->length >= v) return OK;
assert(vr->vaddr <= offset);
newslots = phys_slot(offset - vr->vaddr);
prevslots = phys_slot(vr->length);
assert(newslots >= prevslots);
addedslots = newslots - prevslots;
if(!(newpr = realloc(vr->physblocks,
newslots * sizeof(struct phys_region *)))) {
printf("VM: map_region_extend_upto_v: realloc failed\n");
return ENOMEM;
}
vr->physblocks = newpr;
memset(vr->physblocks + prevslots, 0,
addedslots * sizeof(struct phys_region *));
if((nextvr = getnextvr(vr))) {
assert(offset <= nextvr->vaddr);
}
if(nextvr && nextvr->vaddr < offset) {
printf("VM: can't grow into next region\n");
return ENOMEM;
}
if(!vr->memtype->ev_resize) {
printf("VM: can't resize this type of memory\n");
return ENOMEM;
}
return vr->memtype->ev_resize(vmp, vr, offset - vr->vaddr);
}
/*========================================================================*
* map_unmap_region *
*========================================================================*/
int map_unmap_region(struct vmproc *vmp, struct vir_region *r,
vir_bytes offset, vir_bytes len)
{
/* Shrink the region by 'len' bytes, from the start. Unreference
* memory it used to reference if any.
*/
vir_bytes regionstart;
int freeslots = phys_slot(len);
SANITYCHECK(SCL_FUNCTIONS);
if(offset+len > r->length || (len % VM_PAGE_SIZE)) {
printf("VM: bogus length 0x%lx\n", len);
return EINVAL;
}
regionstart = r->vaddr + offset;
/* unreference its memory */
map_subfree(r, offset, len);
/* if unmap was at start/end of this region, it actually shrinks */
if(offset == 0) {
struct phys_region *pr;
vir_bytes voffset;
int remslots;
region_remove(&vmp->vm_regions_avl, r->vaddr);
USE(r,
r->vaddr += len;
r->length -= len;);
remslots = phys_slot(r->length);
region_insert(&vmp->vm_regions_avl, r);
/* vaddr has increased; to make all the phys_regions
* point to the same addresses, make them shrink by the
* same amount.
*/
for(voffset = offset; voffset < r->length;
voffset += VM_PAGE_SIZE) {
if(!(pr = physblock_get(r, voffset))) continue;
assert(pr->offset >= offset);
USE(pr, pr->offset -= len;);
}
if(remslots)
memmove(r->physblocks, r->physblocks + freeslots,
remslots * sizeof(struct phys_region *));
} else if(offset + len == r->length) {
assert(len <= r->length);
r->length -= len;
}
if(r->length == 0) {
/* Whole region disappears. Unlink and free it. */
region_remove(&vmp->vm_regions_avl, r->vaddr);
map_free(r);
}
SANITYCHECK(SCL_DETAIL);
if(pt_writemap(vmp, &vmp->vm_pt, regionstart,
MAP_NONE, len, 0, WMF_OVERWRITE) != OK) {
printf("VM: map_unmap_region: pt_writemap failed\n");
return ENOMEM;
}
SANITYCHECK(SCL_FUNCTIONS);
return OK;
}
/*========================================================================*
* map_get_phys *
*========================================================================*/
int map_get_phys(struct vmproc *vmp, vir_bytes addr, phys_bytes *r)
{
struct vir_region *vr;
if (!(vr = map_lookup(vmp, addr, NULL)) ||
(vr->vaddr != addr))
return EINVAL;
if (!vr->memtype->regionid)
return EINVAL;
if(r)
*r = vr->memtype->regionid(vr);
return OK;
}
/*========================================================================*
* map_get_ref *
*========================================================================*/
int map_get_ref(struct vmproc *vmp, vir_bytes addr, u8_t *cnt)
{
struct vir_region *vr;
if (!(vr = map_lookup(vmp, addr, NULL)) ||
(vr->vaddr != addr) || !vr->memtype->refcount)
return EINVAL;
if (cnt)
*cnt = vr->memtype->refcount(vr);
return OK;
}
/*========================================================================*
* get_stats_info *
*========================================================================*/
void get_stats_info(struct vm_stats_info *vsi)
{
yielded_t *yb;
vsi->vsi_cached = 0L;
for(yb = lru_youngest; yb; yb = yb->older)
vsi->vsi_cached++;
}
void get_usage_info_kernel(struct vm_usage_info *vui)
{
memset(vui, 0, sizeof(*vui));
vui->vui_total = kernel_boot_info.kernel_allocated_bytes +
kernel_boot_info.kernel_allocated_bytes_dynamic;
}
static void get_usage_info_vm(struct vm_usage_info *vui)
{
memset(vui, 0, sizeof(*vui));
vui->vui_total = kernel_boot_info.vm_allocated_bytes +
get_vm_self_pages() * VM_PAGE_SIZE;
}
/*========================================================================*
* get_usage_info *
*========================================================================*/
void get_usage_info(struct vmproc *vmp, struct vm_usage_info *vui)
{
struct vir_region *vr;
struct phys_region *ph;
region_iter v_iter;
region_start_iter_least(&vmp->vm_regions_avl, &v_iter);
vir_bytes voffset;
memset(vui, 0, sizeof(*vui));
if(vmp->vm_endpoint == VM_PROC_NR) {
get_usage_info_vm(vui);
return;
}
if(vmp->vm_endpoint < 0) {
get_usage_info_kernel(vui);
return;
}
while((vr = region_get_iter(&v_iter))) {
for(voffset = 0; voffset < vr->length; voffset += VM_PAGE_SIZE) {
if(!(ph = physblock_get(vr, voffset))) continue;
/* All present pages are counted towards the total. */
vui->vui_total += VM_PAGE_SIZE;
if (ph->ph->refcount > 1) {
/* Any page with a refcount > 1 is common. */
vui->vui_common += VM_PAGE_SIZE;
/* Any common, non-COW page is shared. */
if (vr->flags & VR_SHARED)
vui->vui_shared += VM_PAGE_SIZE;
}
}
region_incr_iter(&v_iter);
}
}
/*===========================================================================*
* get_region_info *
*===========================================================================*/
int get_region_info(struct vmproc *vmp, struct vm_region_info *vri,
int max, vir_bytes *nextp)
{
struct vir_region *vr;
vir_bytes next;
int count;
region_iter v_iter;
next = *nextp;
if (!max) return 0;
region_start_iter(&vmp->vm_regions_avl, &v_iter, next, AVL_GREATER_EQUAL);
if(!(vr = region_get_iter(&v_iter))) return 0;
for(count = 0; (vr = region_get_iter(&v_iter)) && count < max; count++, vri++) {
struct phys_region *ph1 = NULL, *ph2 = NULL;
vir_bytes voffset;
/* where to start on next iteration, regardless of what we find now */
next = vr->vaddr + vr->length;
/* Report part of the region that's actually in use. */
/* Get first and last phys_regions, if any */
for(voffset = 0; voffset < vr->length; voffset += VM_PAGE_SIZE) {
struct phys_region *ph;
if(!(ph = physblock_get(vr, voffset))) continue;
if(!ph1) ph1 = ph;
ph2 = ph;
}
if(!ph1 || !ph2) { assert(!ph1 && !ph2); continue; }
/* Report start+length of region starting from lowest use. */
vri->vri_addr = vr->vaddr + ph1->offset;
vri->vri_prot = 0;
vri->vri_length = ph2->offset + VM_PAGE_SIZE - ph1->offset;
/* "AND" the provided protection with per-page protection. */
if (!(vr->flags & VR_WRITABLE))
vri->vri_prot &= ~PROT_WRITE;
region_incr_iter(&v_iter);
}
*nextp = next;
return count;
}
/*========================================================================*
* regionprintstats *
*========================================================================*/
void printregionstats(struct vmproc *vmp)
{
struct vir_region *vr;
struct phys_region *pr;
vir_bytes used = 0, weighted = 0;
region_iter v_iter;
region_start_iter_least(&vmp->vm_regions_avl, &v_iter);
while((vr = region_get_iter(&v_iter))) {
vir_bytes voffset;
region_incr_iter(&v_iter);
if(vr->flags & VR_DIRECT)
continue;
for(voffset = 0; voffset < vr->length; voffset+=VM_PAGE_SIZE) {
if(!(pr = physblock_get(vr, voffset))) continue;
used += VM_PAGE_SIZE;
weighted += VM_PAGE_SIZE / pr->ph->refcount;
}
}
printf("%6lukB %6lukB\n", used/1024, weighted/1024);
return;
}
/*===========================================================================*
* get_clean_phys_region *
*===========================================================================*/
static struct phys_region *
get_clean_phys_region(struct vmproc *vmp, vir_bytes vaddr, struct vir_region **ret_region)
{
struct vir_region *region;
vir_bytes mapaddr;
struct phys_region *ph;
mapaddr = vaddr;
if(!(region = map_lookup(vmp, mapaddr, &ph)) || !ph) {
printf("VM: get_clean_phys_region: 0x%lx not found\n", vaddr);
return NULL;
}
assert(mapaddr >= region->vaddr);
assert(mapaddr < region->vaddr + region->length);
/* If it's mapped more than once, make a copy. */
assert(ph->ph->refcount > 0);
if(ph->ph->refcount > 1) {
if(!(ph = map_clone_ph_block(vmp, region,
ph))) {
printf("VM: get_clean_phys_region: ph copy failed\n");
return NULL;
}
}
assert(ph->ph->refcount == 1);
*ret_region = region;
return ph;
}
static int getblock(struct vmproc *vmp, u64_t id, vir_bytes vaddr, int pages)
{
yielded_t *yb;
struct phys_region *ph;
struct vir_region *region;
yielded_avl *avl;
block_id_t blockid;
phys_bytes phaddr;
int p;
/* Try to get the yielded block */
blockid.owner = vmp->vm_endpoint;
blockid.id = id;
avl = get_yielded_avl(blockid);
if(!(yb = yielded_search(avl, blockid, AVL_EQUAL))) {
return ESRCH;
}
if(yb->pages != pages) {
printf("VM: getblock: length mismatch (%d != %d)\n",
pages, yb->pages);
return EFAULT;
}
phaddr = yb->physaddr;
for(p = 0; p < pages; p++) {
/* Get the intended phys region, make sure refcount is 1. */
if(!(ph = get_clean_phys_region(vmp, vaddr, &region))) {
printf("VM: getblock: not found for %d\n", vmp->vm_endpoint);
return EINVAL;
}
assert(ph->ph->refcount == 1);
/* Free the block that is currently there. */
free_mem(ABS2CLICK(ph->ph->phys), 1);
/* Set the phys block to new addr and update pagetable. */
USE(ph->ph, ph->ph->phys = phaddr;);
if(map_ph_writept(vmp, region, ph) != OK) {
/* Presumably it was mapped, so there is no reason
* updating should fail.
*/
panic("do_get_block: couldn't write pt");
}
vaddr += VM_PAGE_SIZE;
phaddr += VM_PAGE_SIZE;
}
/* Forget about the yielded block and free the struct. */
freeyieldednode(yb, 0);
return OK;
}
static int yieldblock(struct vmproc *vmp, u64_t id,
vir_bytes vaddr, yielded_t **retyb, int pages)
{
yielded_t *newyb;
vir_bytes mem_clicks, v, p, new_phaddr;
struct vir_region *region;
struct phys_region *ph = NULL, *prev_ph = NULL, *first_ph = NULL;
yielded_avl *avl;
block_id_t blockid;
/* Makes no sense if yielded block ID already exists, and
* is likely a serious bug in the caller.
*/
blockid.id = id;
blockid.owner = vmp->vm_endpoint;
avl = get_yielded_avl(blockid);
if(yielded_search(avl, blockid, AVL_EQUAL)) {
printf("!");
return EINVAL;
}
if((vaddr % VM_PAGE_SIZE) || pages < 1) return EFAULT;
v = vaddr;
for(p = 0; p < pages; p++) {
if(!(region = map_lookup(vmp, v, &ph)) || !ph) {
printf("VM: do_yield_block: not found for %d\n",
vmp->vm_endpoint);
return EINVAL;
}
if(!(region->flags & VR_ANON)) {
printf("VM: yieldblock: non-anon 0x%lx\n", v);
return EFAULT;
}
if(ph->ph->refcount != 1) {
printf("VM: do_yield_block: mapped not once for %d\n",
vmp->vm_endpoint);
return EFAULT;
}
if(prev_ph) {
if(ph->ph->phys != prev_ph->ph->phys + VM_PAGE_SIZE) {
printf("VM: physically discontiguous yield\n");
return EINVAL;
}
}
prev_ph = ph;
if(!first_ph) first_ph = ph;
v += VM_PAGE_SIZE;
}
/* Make a new block to record the yielding in. */
if(!SLABALLOC(newyb)) {
return ENOMEM;
}
assert(!(ph->ph->phys % VM_PAGE_SIZE));
if((mem_clicks = alloc_mem(pages, PAF_CLEAR)) == NO_MEM) {
SLABFREE(newyb);
return ENOMEM;
}
/* Update yielded block info. */
USE(newyb,
newyb->id = blockid;
newyb->physaddr = first_ph->ph->phys;
newyb->pages = pages;
newyb->younger = NULL;);
new_phaddr = CLICK2ABS(mem_clicks);
/* Set new phys block to new addr and update pagetable. */
v = vaddr;
for(p = 0; p < pages; p++) {
region = map_lookup(vmp, v, &ph);
assert(region && ph);
assert(ph->ph->refcount == 1);
USE(ph->ph,
ph->ph->phys = new_phaddr;);
if(map_ph_writept(vmp, region, ph) != OK) {
/* Presumably it was mapped, so there is no reason
* updating should fail.
*/
panic("yield_block: couldn't write pt");
}
v += VM_PAGE_SIZE;
new_phaddr += VM_PAGE_SIZE;
}
/* Remember yielded block. */
yielded_insert(avl, newyb);
vmp->vm_yielded++;
/* Add to LRU list too. It's the youngest block. */
LRUCHECK;
if(lru_youngest) {
USE(lru_youngest,
lru_youngest->younger = newyb;);
} else {
lru_oldest = newyb;
}
USE(newyb,
newyb->older = lru_youngest;);
lru_youngest = newyb;
LRUCHECK;
if(retyb)
*retyb = newyb;
return OK;
}
/*===========================================================================*
* do_forgetblocks *
*===========================================================================*/
int do_forgetblocks(message *m)
{
int n;
struct vmproc *vmp;
endpoint_t caller = m->m_source;
if(vm_isokendpt(caller, &n) != OK)
panic("do_yield_block: message from strange source: %d",
m->m_source);
vmp = &vmproc[n];
free_yielded_proc(vmp);
return OK;
}
/*===========================================================================*
* do_forgetblock *
*===========================================================================*/
int do_forgetblock(message *m)
{
int n;
struct vmproc *vmp;
endpoint_t caller = m->m_source;
yielded_t *yb;
u64_t id;
block_id_t blockid;
yielded_avl *avl;
if(vm_isokendpt(caller, &n) != OK)
panic("do_yield_block: message from strange source: %d",
m->m_source);
vmp = &vmproc[n];
id = make64(m->VMFB_IDLO, m->VMFB_IDHI);
blockid.id = id;
blockid.owner = vmp->vm_endpoint;
avl = get_yielded_avl(blockid);
if((yb = yielded_search(avl, blockid, AVL_EQUAL))) {
freeyieldednode(yb, 1);
}
return OK;
}
/*===========================================================================*
* do_yieldblockgetblock *
*===========================================================================*/
int do_yieldblockgetblock(message *m)
{
u64_t yieldid, getid;
int n;
endpoint_t caller = m->m_source;
struct vmproc *vmp;
yielded_t *yb = NULL;
int r = ESRCH;
int pages;
if(vm_isokendpt(caller, &n) != OK)
panic("do_yieldblockgetblock: message from strange source: %d",
m->m_source);
vmp = &vmproc[n];
pages = m->VMYBGB_LEN / VM_PAGE_SIZE;
if((m->VMYBGB_LEN % VM_PAGE_SIZE) || pages < 1) {
static int printed;
if(!printed) {
printed = 1;
printf("vm: non-page-aligned or short block length\n");
}
return EFAULT;
}
yieldid = make64(m->VMYBGB_YIELDIDLO, m->VMYBGB_YIELDIDHI);
getid = make64(m->VMYBGB_GETIDLO, m->VMYBGB_GETIDHI);
if(cmp64(yieldid, VM_BLOCKID_NONE) != 0) {
/* A block was given to yield. */
yieldblock(vmp, yieldid, (vir_bytes) m->VMYBGB_VADDR, &yb,
pages);
}
if(cmp64(getid, VM_BLOCKID_NONE) != 0) {
/* A block was given to get. */
r = getblock(vmp, getid, (vir_bytes) m->VMYBGB_VADDR, pages);
}
return r;
}
void map_setparent(struct vmproc *vmp)
{
region_iter iter;
struct vir_region *vr;
region_start_iter_least(&vmp->vm_regions_avl, &iter);
while((vr = region_get_iter(&iter))) {
USE(vr, vr->parent = vmp;);
region_incr_iter(&iter);
}
}
int physregions(struct vir_region *vr)
{
int n = 0;
vir_bytes voffset;
for(voffset = 0; voffset < vr->length; voffset += VM_PAGE_SIZE) {
if(physblock_get(vr, voffset))
n++;
}
return n;
}
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