* The entry addresses could be pointing to either guest physical memory or host physical memory
* Instead we just return the entry address, and a flag to show if it points to a pte or a large page...
*/
-pde32_entry_type_t pde32_lookup(pde32_t * pde, addr_t addr, addr_t * entry) {
- pde32_t * pde_entry = &(pde[PDE32_INDEX(addr)]);
+pde32_entry_type_t pde32_lookup(pde32_t * pd, addr_t addr, addr_t * entry) {
+ pde32_t * pde_entry = &(pd[PDE32_INDEX(addr)]);
if (!pde_entry->present) {
*entry = 0;
- return NOT_PRESENT;
+ return PDE32_ENTRY_NOT_PRESENT;
} else {
*entry = PAGE_ADDR(pde_entry->pt_base_addr);
- if (pde_entry->large_pages) {
+ if (pde_entry->large_page) {
*entry += PAGE_OFFSET(addr);
- return LARGE_PAGE;
+ return PDE32_ENTRY_LARGE_PAGE;
} else {
- return PTE32;
+ *entry = PDE32_T_ADDR(*pde_entry);
+ return PDE32_ENTRY_PTE32;
}
}
- return NOT_PRESENT;
+ return PDE32_ENTRY_NOT_PRESENT;
}
-int pte32_lookup(pte32_t * pte, addr_t addr, addr_t * entry) {
- pte32_t * pte_entry = &(pte[PTE32_INDEX(addr)]);
+
+/* Takes a virtual addr (addr) and returns the physical addr (entry) as defined in the page table
+ */
+int pte32_lookup(pte32_t * pt, addr_t addr, addr_t * entry) {
+ pte32_t * pte_entry = &(pt[PTE32_INDEX(addr)]);
if (!pte_entry->present) {
*entry = 0;
+ PrintDebug("Lookup at non present page (index=%d)\n", PTE32_INDEX(addr));
return -1;
} else {
- *entry = PAGE_ADDR(pte_entry->page_base_addr);
- *entry += PAGE_OFFSET(addr);
+ *entry = PTE32_T_ADDR(*pte_entry) + PT32_PAGE_OFFSET(addr);
return 0;
}
+pt_access_status_t can_access_pde32(pde32_t * pde, addr_t addr, pf_error_t access_type) {
+ pde32_t * entry = &pde[PDE32_INDEX(addr)];
+ if (entry->present == 0) {
+ return PT_ENTRY_NOT_PRESENT;
+ } else if ((entry->writable == 0) && (access_type.write == 1)) {
+ return PT_WRITE_ERROR;
+ } else if ((entry->user_page == 0) && (access_type.user == 1)) {
+ // Check CR0.WP
+ return PT_USER_ERROR;
+ }
+
+ return PT_ACCESS_OK;
+}
+
+
+pt_access_status_t can_access_pte32(pte32_t * pte, addr_t addr, pf_error_t access_type) {
+ pte32_t * entry = &pte[PTE32_INDEX(addr)];
+
+ if (entry->present == 0) {
+ return PT_ENTRY_NOT_PRESENT;
+ } else if ((entry->writable == 0) && (access_type.write == 1)) {
+ return PT_WRITE_ERROR;
+ } else if ((entry->user_page == 0) && (access_type.user == 1)) {
+ // Check CR0.WP
+ return PT_USER_ERROR;
+ }
+
+ return PT_ACCESS_OK;
+}
int i, j;
struct shadow_map * map = &(guest_info->mem_map);
-
pde32_t * pde = os_hooks->allocate_pages(1);
for (i = 0; i < MAX_PDE32_ENTRIES; i++) {
(region->host_type == HOST_REGION_REMOTE) ||
(region->host_type == HOST_REGION_SWAPPED)) {
pte[j].present = 0;
- pte[j].flags = 0;
+ pte[j].writable = 0;
+ pte[j].user_page = 0;
+ pte[j].write_through = 0;
+ pte[j].cache_disable = 0;
pte[j].accessed = 0;
pte[j].dirty = 0;
pte[j].pte_attr = 0;
} else {
addr_t host_addr;
pte[j].present = 1;
- pte[j].flags = VM_READ | VM_WRITE | VM_EXEC | VM_USER;
-
+ pte[j].writable = 1;
+ pte[j].user_page = 1;
+ pte[j].write_through = 0;
+ pte[j].cache_disable = 0;
pte[j].accessed = 0;
pte[j].dirty = 0;
pte[j].pte_attr = 0;
os_hooks->free_page(pte);
pde[i].present = 0;
- pde[i].flags = 0;
+ pde[i].writable = 0;
+ pde[i].user_page = 0;
+ pde[i].write_through = 0;
+ pde[i].cache_disable = 0;
pde[i].accessed = 0;
pde[i].reserved = 0;
- pde[i].large_pages = 0;
+ pde[i].large_page = 0;
pde[i].global_page = 0;
pde[i].vmm_info = 0;
pde[i].pt_base_addr = 0;
} else {
pde[i].present = 1;
- pde[i].flags = VM_READ | VM_WRITE | VM_EXEC | VM_USER;
+ pde[i].writable = 1;
+ pde[i].user_page = 1;
+ pde[i].write_through = 0;
+ pde[i].cache_disable = 0;
pde[i].accessed = 0;
pde[i].reserved = 0;
- pde[i].large_pages = 0;
+ pde[i].large_page = 0;
pde[i].global_page = 0;
pde[i].vmm_info = 0;
pde[i].pt_base_addr = PAGE_ALIGNED_ADDR(pte);
void PrintPDE32(addr_t virtual_address, pde32_t * pde)
{
- PrintDebug("PDE %p -> %p : present=%x, flags=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
- virtual_address,
- (void *) (pde->pt_base_addr << PAGE_POWER),
- pde->present,
- pde->flags,
- pde->accessed,
- pde->reserved,
- pde->large_pages,
- pde->global_page,
- pde->vmm_info);
+ PrintDebug("PDE %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
+ virtual_address,
+ (void *) (pde->pt_base_addr << PAGE_POWER),
+ pde->present,
+ pde->writable,
+ pde->user_page,
+ pde->write_through,
+ pde->cache_disable,
+ pde->accessed,
+ pde->reserved,
+ pde->large_page,
+ pde->global_page,
+ pde->vmm_info);
}
void PrintPTE32(addr_t virtual_address, pte32_t * pte)
{
- PrintDebug("PTE %p -> %p : present=%x, flags=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, vmm_info=%x\n",
- virtual_address,
- (void*)(pte->page_base_addr << PAGE_POWER),
- pte->present,
- pte->flags,
- pte->accessed,
- pte->dirty,
- pte->pte_attr,
- pte->global_page,
- pte->vmm_info);
+ PrintDebug("PTE %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, vmm_info=%x\n",
+ virtual_address,
+ (void*)(pte->page_base_addr << PAGE_POWER),
+ pte->present,
+ pte->writable,
+ pte->user_page,
+ pte->write_through,
+ pte->cache_disable,
+ pte->accessed,
+ pte->dirty,
+ pte->pte_attr,
+ pte->global_page,
+ pte->vmm_info);
}