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/*
* \brief Virtual page-table facility
* \author Thomas Friebel <tf13@os.inf.tu-dresden.de>
* \author Christian Helmuth <ch12@os.inf.tu-dresden.de>
* \date 2006-11-01
*
* This implementation uses l4rm (especially the AVL tree and userptr) to
* manage virt->phys mappings. Each mapping region is represented by one
* pgtab_object that is kept in the l4rm region userptr.
*
* For this to work, dataspaces must be attached to l4rm regions!
*/
#include <l4/dde/ddekit/pgtab.h>
#include <l4/dde/ddekit/memory.h>
#include <l4/dde/ddekit/panic.h>
#include <l4/l4rm/l4rm.h>
#include <l4/lock/lock.h>
#include <l4/util/macros.h>
#include "config.h"
/**
* "Page-table" object
*/
struct pgtab_object
{
l4_addr_t va; /* virtual start address */
l4_addr_t pa; /* physical start address */
/* FIXME reconsider the following members */
l4_size_t size;
unsigned type; /* pgtab region type */
struct pgtab_object * next;
struct pgtab_object * prev;
};
/**
* pa_list_head of page-table object list (for get_virtaddr())
*/
static struct pgtab_object pa_list_head =
{
.va = 0,
.pa = 0,
.size = 0,
.next = &pa_list_head,
.prev = &pa_list_head
};
static l4lock_t pa_list_lock = L4LOCK_UNLOCKED;
/*****************************
** Page-table facility API **
*****************************/
/**
* Get physical address for virtual address
*
* \param virtual virtual address
* \return physical address or 0
*/
ddekit_addr_t ddekit_pgtab_get_physaddr(const void *virtual)
{
/* find pgtab object */
struct pgtab_object *p = l4rm_get_userptr(virtual);
if (!p) {
/* XXX this is verbose */
LOG_Error("no virt->phys mapping for virtual address %p", virtual);
return 0;
}
/* return virt->phys mapping */
l4_size_t offset = (l4_addr_t) virtual - p->va;
return p->pa + offset;
}
/**
* Get virtual address for physical address
*
* \param physical physical address
* \return virtual address or 0
*/
ddekit_addr_t ddekit_pgtab_get_virtaddr(const ddekit_addr_t physical)
{
/* find pgtab object */
struct pgtab_object *p;
ddekit_addr_t retval = 0;
/* find phys->virt mapping */
l4lock_lock(&pa_list_lock);
for (p = pa_list_head.next ; p != &pa_list_head ; p = p->next) {
if (p->pa <= (l4_addr_t)physical &&
(l4_addr_t)physical < p->pa + p->size) {
l4_size_t offset = (l4_addr_t) physical - p->pa;
retval = p->va + offset;
break;
}
}
l4lock_unlock(&pa_list_lock);
if (!retval)
LOG_Error("no phys->virt mapping for physical address %p", (void*)physical);
return retval;
}
int ddekit_pgtab_get_type(const void *virtual)
{
/* find pgtab object */
struct pgtab_object *p = l4rm_get_userptr(virtual);
if (!p) {
/* XXX this is verbose */
LOG_Error("no virt->phys mapping for %p", virtual);
return -1;
}
return p->type;
}
int ddekit_pgtab_get_size(const void *virtual)
{
/* find pgtab object */
struct pgtab_object *p = l4rm_get_userptr(virtual);
if (!p) {
/* XXX this is verbose */
LOG_Error("no virt->phys mapping for %p", virtual);
return -1;
}
return p->size;
}
/**
* Clear virtual->physical mapping for VM region
*
* \param virtual virtual start address for region
* \param type pgtab type for region
*/
void ddekit_pgtab_clear_region(void *virtual, int type)
{
struct pgtab_object *p;
/* find pgtab object */
p = (struct pgtab_object *)l4rm_get_userptr(virtual);
if (!p) {
/* XXX this is verbose */
LOG_Error("no virt->phys mapping for %p", virtual);
return;
}
/* reset userptr in region map */
/* XXX no error handling here */
l4rm_set_userptr(virtual, 0);
/* remove pgtab object from list */
l4lock_lock(&pa_list_lock);
p->next->prev= p->prev;
p->prev->next= p->next;
l4lock_unlock(&pa_list_lock);
/* free pgtab object */
ddekit_simple_free(p);
}
/**
* Set virtual->physical mapping for VM region
*
* \param virtual virtual start address for region
* \param physical physical start address for region
* \param pages number of pages in region
* \param type pgtab type for region
*/
void ddekit_pgtab_set_region(void *virtual, ddekit_addr_t physical, int pages, int type)
{
/* allocate pgtab object */
struct pgtab_object *p = ddekit_simple_malloc(sizeof(*p));
if (!p) {
LOG_Error("ddekit heap exhausted");
return;
}
/* initialize pgtab object */
p->va = l4_trunc_page(virtual);
p->pa = l4_trunc_page(physical);
p->size = pages * L4_PAGESIZE;
p->type = type;
l4lock_lock(&pa_list_lock);
p->next=pa_list_head.next;
p->prev=&pa_list_head;
pa_list_head.next->prev=p;
pa_list_head.next=p;
l4lock_unlock(&pa_list_lock);
/* set userptr in region map to pgtab object */
int err = l4rm_set_userptr((void *)p->va, p);
if (err) {
LOG_Error("l4rm_set_userptr returned %d", err);
ddekit_panic("l4rm_set_userptr");
ddekit_simple_free(p);
}
}
void ddekit_pgtab_set_region_with_size(void *virt, ddekit_addr_t phys, int size, int type)
{
int p = l4_round_page(size);
p >>= L4_PAGESHIFT;
ddekit_pgtab_set_region(virt, phys, p, type);
}
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