* Paging (virtual memory) support
* Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
* Copyright (c) 2003,2004 David H. Hovemeyer <daveho@cs.umd.edu>
- * $Revision: 1.1 $
+ * $Revision: 1.2 $
*
* This is free software. You are permitted to use,
* redistribute, and modify it as specified in the file "COPYING".
//#include <geekos/vfs.h>
#include <geekos/crc32.h>
#include <geekos/paging.h>
-#include <geekos/serial.h>
+#include <geekos/debug.h>
/* ----------------------------------------------------------------------
* flag to indicate if debugging paging code
*/
int debugFaults = 0;
-#define Debug(args...) if (debugFaults) Print(args)
+#define Debug(args...) if (debugFaults) PrintBoth(args)
-void SerialPrintPD(pde_t *pde)
+void PrintPD(pde_t *pde)
{
- int i;
+ uint_t i;
- SerialPrint("Page Directory at %p:\n",pde);
- for (i=0;i<NUM_PAGE_DIR_ENTRIES && pde[i].present;i++) {
- SerialPrintPDE((void*)(PAGE_SIZE*NUM_PAGE_TABLE_ENTRIES*i),&(pde[i]));
+ PrintBoth("Page Directory at %p:\n",pde);
+ for (i = 0; i < NUM_PAGE_DIR_ENTRIES; i++) {
+ if (pde[i].present) {
+ if ((i * PAGE_SIZE * 1024) > 0x40000000) {
+ PrintPDE((void*)(PAGE_SIZE*NUM_PAGE_TABLE_ENTRIES*i),&(pde[i]));
+ }
+ }
}
}
-void SerialPrintPT(void *starting_address, pte_t *pte)
+void PrintPT(void *starting_address, pte_t *pte)
{
int i;
- SerialPrint("Page Table at %p:\n",pte);
- for (i=0;i<NUM_PAGE_TABLE_ENTRIES && pte[i].present;i++) {
- SerialPrintPTE(starting_address + PAGE_SIZE*i,&(pte[i]));
+ PrintBoth("Page Table at %p:\n",pte);
+ for (i=0;i<NUM_PAGE_TABLE_ENTRIES;i++) {
+ if (pte[i].present) {
+ PrintPTE(starting_address + PAGE_SIZE*i,&(pte[i]));
+ }
}
}
-void SerialPrintPDE(void *virtual_address, pde_t *pde)
+void PrintPDE(void *virtual_address, pde_t *pde)
{
- SerialPrint("PDE %p -> %p : present=%x, flags=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
+ Print("PDE %p -> %p : present=%x, flags=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
virtual_address,
(void*) (pde->pageTableBaseAddr << PAGE_POWER),
pde->present,
pde->kernelInfo);
}
-void SerialPrintPTE(void *virtual_address, pte_t *pte)
+void PrintPTE(void *virtual_address, pte_t *pte)
{
- SerialPrint("PTE %p -> %p : present=%x, flags=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, kernelInfo=%x\n",
+ PrintBoth("PTE %p -> %p : present=%x, flags=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, kernelInfo=%x\n",
virtual_address,
(void*)(pte->pageBaseAddr << PAGE_POWER),
pte->present,
}
-void SerialDumpPageTables(pde_t *pde)
+void DumpPageTables(pde_t *pde)
{
- int i;
+ uint_t i;
- SerialPrint("Dumping the pages starting with the pde page at %p\n",pde);
+ PrintBoth("Dumping the pages starting with the pde page at %p\n",pde);
- for (i=0;i<NUM_PAGE_DIR_ENTRIES && pde[i].present;i++) {
- SerialPrintPDE((void*)(PAGE_SIZE*NUM_PAGE_TABLE_ENTRIES*i),&(pde[i]));
- SerialPrintPT((void*)(PAGE_SIZE*NUM_PAGE_TABLE_ENTRIES*i),(void*)(pde[i].pageTableBaseAddr<<PAGE_POWER));
+ for (i = 0; i < NUM_PAGE_DIR_ENTRIES; i++) {
+ if (pde[i].present) {
+ if ((i * PAGE_SIZE * 1024) >= 0x40000000) {
+ PrintPDE((void *)(PAGE_SIZE * NUM_PAGE_TABLE_ENTRIES * i), &(pde[i]));
+ PrintPT((void *)(PAGE_SIZE * NUM_PAGE_TABLE_ENTRIES * i), (void *)(pde[i].pageTableBaseAddr << PAGE_POWER));
+ }
+ }
}
}
g_freePageCount+=0;
- SerialPrintLevel(100,"Pid %d, Page Fault received, at address %x (%d pages free)\n",
+ PrintBoth("Pid %d, Page Fault received, at address %x (%d pages free)\n",
g_currentThread->pid, address, g_freePageCount);
if (faultCode.protectionViolation)
- SerialPrintLevel(100," Protection Violation, ");
+ PrintBoth(" Protection Violation, ");
else
- SerialPrintLevel(100," Non-present page, ");
+ PrintBoth(" Non-present page, ");
if (faultCode.writeFault)
- SerialPrintLevel(100,"Write Fault, ");
+ PrintBoth("Write Fault, ");
else
- SerialPrintLevel(100,"Read Fault, ");
+ PrintBoth("Read Fault, ");
if (faultCode.userModeFault)
- SerialPrintLevel(100,"in User Mode\n");
+ PrintBoth("in User Mode\n");
else
- SerialPrintLevel(100,"in Supervisor Mode\n");
+ PrintBoth("in Supervisor Mode\n");
}
/*
/* Get the address that caused the page fault */
address = Get_Page_Fault_Address();
- Debug("Page fault @%lx\n", address);
+ PrintBoth("Page fault @%lx\n", address);
/* Get the fault code */
faultCode = *((faultcode_t *) &(state->errorCode));
/* rest of your handling code here */
- SerialPrintLevel(100,"Unexpected Page Fault received\n");
+ PrintBoth("Unexpected Page Fault received\n");
Print_Fault_Info(address, faultCode);
Dump_Interrupt_State(state);
/* user faults just kill the process */
PrintBoth("Intitialing Virtual Memory\n");
if (checkPaging()) {
- SerialPrintLevel(100,"Paging is currently ON\n");
+ PrintBoth("Paging is currently ON\n");
return ;
}
- SerialPrintLevel(100,"Paging is currently OFF - initializing the pages for a 1-1 map\n");
+ PrintBoth("Paging is currently OFF - initializing the pages for a 1-1 map\n");
numpages=bootInfo->memSizeKB / (PAGE_SIZE/1024);
numpagetables = numpages / NUM_PAGE_TABLE_ENTRIES + ((numpages % NUM_PAGE_TABLE_ENTRIES) != 0 );
- SerialPrintLevel(100,"We need %d pages, and thus %d page tables, and one page directory\n",numpages, numpagetables);
+ PrintBoth("We need %d pages, and thus %d page tables, and one page directory\n",numpages, numpagetables);
pd = (pde_t*)Alloc_Page();
if (!pd) {
- SerialPrintLevel(100,"We are giving up since we can't allocate a page directory!\n");
+ PrintBoth("We are giving up since we can't allocate a page directory!\n");
return;
} else {
- SerialPrintLevel(100,"Our PDE is at physical address %p\n",pd);
+ PrintBoth("Our PDE is at physical address %p\n",pd);
}
for (i=0;i<NUM_PAGE_DIR_ENTRIES;i++) {
} else {
pt = (pte_t*)Alloc_Page();
if (!pt) {
- SerialPrintLevel(100,"We are giving up since we can't allocate page table %d\n",i);
+ PrintBoth("We are giving up since we can't allocate page table %d\n",i);
} else {
- //SerialPrintLevel(100,"Page Table %d is at physical address %p\n",i,pt);
+ //PrintBoth("Page Table %d is at physical address %p\n",i,pt);
}
pd[i].present=1;
pd[i].flags= VM_READ | VM_WRITE | VM_EXEC | VM_USER;
}
}
}
- SerialPrintLevel(100,"Done creating 1<->1 initial page tables\n");
- SerialPrintLevel(100,"Now installing page fault handler\n");
+
+
+ PrintBoth("Done creating 1<->1 initial page tables\n");
+ PrintBoth("Now installing page fault handler\n");
// SerialDumpPageTables(pd);
Install_Interrupt_Handler(14,Page_Fault_Handler);
- SerialPrintLevel(100,"Now turning on the paging bit!\n");
+ PrintBoth("Now turning on the paging bit!\n");
Enable_Paging(pd);
- SerialPrintLevel(100,"We are still alive after paging turned on!\n");
- SerialPrintLevel(100,"checkPaging returns %d\n",checkPaging());
+ PrintBoth("We are still alive after paging turned on!\n");
+ PrintBoth("checkPaging returns %d\n",checkPaging());
+}
+
+
+
+/* How we test...
+ * 1 <-> 1 mapping of physical memory,
+ * We assume that physical memory << 1G
+ * we setup the test so that 1G+ is mapped in a testable order
+ * then go through and ensure that all the paging operations work...
+ * The static mapping sits at 1G
+ * The tests are run at 2G
+
+ */
+
+void VM_Test(struct Boot_Info *bootInfo, uint_t num_test_pages) {
+ int i,j;
+
+ pde_t * pd;
+ //pde_t *pde;
+ // pte_t *pte;
+
+ PrintBoth("Running Paging Test\n");
+
+ pd = Get_PDBR();
+
+
+ void * one_gig = (void *)0x40000000;
+ void * two_gig = (void *)0x80000000;
+
+ /* Set up the 1 GIG static map */
+ ulong_t pde_offset = (((ulong_t)one_gig / PAGE_SIZE) / 1024);
+ for (i = 0; i < num_test_pages; i += 1024) {
+ pde_t * pde = &(pd[pde_offset + (i / 1024)]);
+ pte_t * pte = (pte_t *)Alloc_Page();
+ memset(pte, 0, PAGE_SIZE);
+
+ pde->present = 1;
+ pde->flags= VM_READ | VM_WRITE | VM_EXEC | VM_USER;
+ pde->pageTableBaseAddr = PAGE_ALLIGNED_ADDR(pte);
+
+ for (j = 0; (j + i) < num_test_pages ; j++) {
+ pte[j].present = 1;
+ pte[j].flags = VM_READ | VM_WRITE | VM_EXEC | VM_USER;
+ pte[j].pageBaseAddr = PAGE_ALLIGNED_ADDR(Alloc_Page());
+ }
+ }
+
+ PrintBoth("Setup VM Test static map\n");
+
+
+ /* Setup the Two Gig test area */
+ /* First is just a incrmental mirroring of the 1G area */
+
+ pde_offset = (((ulong_t)two_gig / PAGE_SIZE) / 1024);
+
+ for (i = 0; i < num_test_pages; i += 1024) {
+ pde_t * pde = &(pd[pde_offset + (i / 1024)]);
+ pte_t * pte = (pte_t *)Alloc_Page();
+ memset(pte, 0, PAGE_SIZE);
+
+ pde->present = 1;
+ pde->flags= VM_READ | VM_WRITE | VM_EXEC | VM_USER;
+ pde->pageTableBaseAddr = PAGE_ALLIGNED_ADDR(pte);
+
+ for (j = 0; (j + i) < num_test_pages; j++) {
+ pte_t * static_pte = LookupPage(one_gig + (PAGE_SIZE * (j+i)));
+ pte[j].present = 1;
+ pte[j].flags = VM_READ | VM_WRITE | VM_EXEC | VM_USER;
+ pte[j].pageBaseAddr = static_pte->pageBaseAddr;
+ }
+ }
+
+ PrintBoth("Setup initial test area\n");
+
+ PrintBoth("Loading CR3\n");
+ Set_PDBR(pd);
+
+ DumpPageTables(pd);
+
+ PrintBoth("Writing to Test Area\n");
+
+ /* Write data to each page in the 2G test area */
+ uint_t * test_ptr = (uint_t *)two_gig;
+ for (i = 0; i < num_test_pages; i++) {
+
+ PrintBoth("Writing %d to %p\n", i, test_ptr);
+ *test_ptr = (uint_t)i;
+ test_ptr += PAGE_SIZE / 4;
+ }
+
+
+ PrintBoth("Reversing Page Mapping\n");
+
+ /* Reverse 2G test area mapping */
+
+ pde_offset = (((ulong_t)two_gig / PAGE_SIZE) / 1024);
+
+ for (i = 0; i < num_test_pages; i += 1024) {
+ pde_t * pde = &(pd[pde_offset + (i / 1024)]);
+ pte_t * pte = (pte_t *)(pde->pageTableBaseAddr << 12);
+
+ for (j = 0; (j + i) < num_test_pages ; j++) {
+ pte_t * static_pte = LookupPage(one_gig + (PAGE_SIZE * (num_test_pages - (j+i) - 1)));
+ pte[j].pageBaseAddr = static_pte->pageBaseAddr;
+ }
+ }
+
+
+ Set_PDBR(pd);
+
+ PrintBoth("Page Mapping Reversed\n");
+ DumpPageTables(pd);
+
+
+ PrintBoth("Page Consistency Check\n");
+
+ test_ptr = (uint_t *)two_gig;
+ for (i = 0; i < num_test_pages; i++) {
+ if ((*test_ptr) != num_test_pages - (i+1)) {
+ PrintBoth("Consistency Error: (Test Value=%d; Actual Value=%d)\n", (num_test_pages - i), (*test_ptr));
+ while(1);
+ }
+ test_ptr += PAGE_SIZE / 4;
+ }
+
+ PrintBoth("Test Sucessful\n");
+
+
+ PrintBoth("Invalidation Test\n");
+
+
+ Invalidate_PG(two_gig);
+
+ uint_t foo = 0;
+
+ foo = *(uint_t *)two_gig;
+ *(uint_t *)((char *)two_gig + 4) = foo;
+
+
+ PrintBoth("Invalidation Test Successful\n");
}
