diff options
Diffstat (limited to 'kernel.soso/vmm.c')
| -rw-r--r-- | kernel.soso/vmm.c | 261 |
1 files changed, 87 insertions, 174 deletions
diff --git a/kernel.soso/vmm.c b/kernel.soso/vmm.c index 740763b3..7dad53be 100644 --- a/kernel.soso/vmm.c +++ b/kernel.soso/vmm.c @@ -16,8 +16,7 @@ static int gTotalPageCount = 0; static void handlePageFault(Registers *regs); static void syncPageDirectoriesKernelMemory(); -void initializeMemory(uint32 high_mem) -{ +void initializeMemory(uint32 high_mem) { int pg; unsigned long i; @@ -25,41 +24,34 @@ void initializeMemory(uint32 high_mem) gTotalPageCount = (high_mem * 1024) / PAGESIZE_4M; - for (pg = 0; pg < gTotalPageCount / 8; ++pg) - { + for (pg = 0; pg < gTotalPageCount / 8; ++pg) { gPhysicalPageFrameBitmap[pg] = 0; } - for (pg = gTotalPageCount / 8; pg < RAM_AS_4M_PAGES / 8; ++pg) - { + for (pg = gTotalPageCount / 8; pg < RAM_AS_4M_PAGES / 8; ++pg) { gPhysicalPageFrameBitmap[pg] = 0xFF; } //Pages reserved for the kernel - for (pg = PAGE_INDEX_4M(0x0); pg < (int)(PAGE_INDEX_4M(RESERVED_AREA)); ++pg) - { + for (pg = PAGE_INDEX_4M(0x0); pg < (int)(PAGE_INDEX_4M(RESERVED_AREA)); ++pg) { SET_PAGEFRAME_USED(gPhysicalPageFrameBitmap, pg); } //Heap pages reserved - for (pg = 0; pg < RAM_AS_4K_PAGES / 8; ++pg) - { + for (pg = 0; pg < RAM_AS_4K_PAGES / 8; ++pg) { gKernelPageHeapBitmap[pg] = 0xFF; } - for (pg = PAGE_INDEX_4K(KERN_PD_AREA_BEGIN); pg < (int)(PAGE_INDEX_4K(KERN_PD_AREA_END)); ++pg) - { + for (pg = PAGE_INDEX_4K(KERN_PD_AREA_BEGIN); pg < (int)(PAGE_INDEX_4K(KERN_PD_AREA_END)); ++pg) { SET_PAGEHEAP_UNUSED(pg * PAGESIZE_4K); } //Identity map - for (i = 0; i < 4; ++i) - { + for (i = 0; i < 4; ++i) { gKernelPageDirectory[i] = (i * PAGESIZE_4M | (PG_PRESENT | PG_WRITE | PG_4MB));//add PG_USER for accesing kernel code in user mode } - for (i = 4; i < 1024; ++i) - { + for (i = 4; i < 1024; ++i) { gKernelPageDirectory[i] = 0; } @@ -76,19 +68,14 @@ void initializeMemory(uint32 high_mem) initializeKernelHeap(); } -char* getPageFrame4M() -{ +char* getPageFrame4M() { int byte, bit; uint32 page = -1; - for (byte = 0; byte < RAM_AS_4M_PAGES / 8; byte++) - { - if (gPhysicalPageFrameBitmap[byte] != 0xFF) - { - for (bit = 0; bit < 8; bit++) - { - if (!(gPhysicalPageFrameBitmap[byte] & (1 << bit))) - { + for (byte = 0; byte < RAM_AS_4M_PAGES / 8; byte++) { + if (gPhysicalPageFrameBitmap[byte] != 0xFF) { + for (bit = 0; bit < 8; bit++) { + if (!(gPhysicalPageFrameBitmap[byte] & (1 << bit))) { page = 8 * byte + bit; SET_PAGEFRAME_USED(gPhysicalPageFrameBitmap, page); Debug_PrintF("DEBUG: got 4M on physical %x\n", page * PAGESIZE_4M); @@ -102,28 +89,22 @@ char* getPageFrame4M() return (char *) -1; } -void releasePageFrame4M(uint32 p_addr) -{ +void releasePageFrame4M(uint32 p_addr) { Debug_PrintF("DEBUG: released 4M on physical %x\n", p_addr); SET_PAGEFRAME_UNUSED(gPhysicalPageFrameBitmap, p_addr); } -uint32* getPdFromReservedArea4K() -{ +uint32* getPdFromReservedArea4K() { int byte, bit; int page = -1; //printkf("DEBUG: getPdFromReservedArea4K() begin\n"); - for (byte = 0; byte < RAM_AS_4K_PAGES / 8; byte++) - { - if (gKernelPageHeapBitmap[byte] != 0xFF) - { - for (bit = 0; bit < 8; bit++) - { - if (!(gKernelPageHeapBitmap[byte] & (1 << bit))) - { + for (byte = 0; byte < RAM_AS_4K_PAGES / 8; byte++) { + if (gKernelPageHeapBitmap[byte] != 0xFF) { + for (bit = 0; bit < 8; bit++) { + if (!(gKernelPageHeapBitmap[byte] & (1 << bit))) { page = 8 * byte + bit; SET_PAGEHEAP_USED(page); //printkf("DEBUG: getPdFromReservedArea4K() found pageIndex:%d\n", page); @@ -137,45 +118,38 @@ uint32* getPdFromReservedArea4K() return (uint32 *) -1; } -void releasePdFromReservedArea4K(uint32 *v_addr) -{ +void releasePdFromReservedArea4K(uint32 *v_addr) { SET_PAGEHEAP_UNUSED(v_addr); } -uint32 *createPd() -{ +uint32 *createPd() { int i; uint32* pd = getPdFromReservedArea4K(); - for (i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) - { + for (i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) { pd[i] = gKernelPageDirectory[i]; } - for (i = KERNELMEMORY_PAGE_COUNT; i < 1024; ++i) - { + for (i = KERNELMEMORY_PAGE_COUNT; i < 1024; ++i) { pd[i] = 0; } return pd; } -void destroyPd(uint32 *pd) -{ +void destroyPd(uint32 *pd) { int startIndex = PAGE_INDEX_4M(USER_OFFSET); int lastIndex = PAGE_INDEX_4M(USER_OFFSET_END); ///we don't touch mmapped areas - for (int i = startIndex; i < lastIndex; ++i) - { + for (int i = startIndex; i < lastIndex; ++i) { uint32 p_addr = pd[i] & 0xFFC00000; - if (p_addr) - { + if (p_addr) { releasePageFrame4M(p_addr); } @@ -185,26 +159,22 @@ void destroyPd(uint32 *pd) releasePdFromReservedArea4K(pd); } -uint32 *copyPd(uint32* pd) -{ +uint32 *copyPd(uint32* pd) { int i; uint32* newPd = getPdFromReservedArea4K(); - for (i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) - { + for (i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) { newPd[i] = gKernelPageDirectory[i]; } disablePaging(); - for (i = KERNELMEMORY_PAGE_COUNT; i < 1024; ++i) - { + for (i = KERNELMEMORY_PAGE_COUNT; i < 1024; ++i) { newPd[i] = 0; - if ((pd[i] & PG_PRESENT) == PG_PRESENT) - { + if ((pd[i] & PG_PRESENT) == PG_PRESENT) { uint32 pagePyhsical = pd[i] & 0xFFC00000; char* newPagePhysical = getPageFrame4M(); @@ -226,8 +196,7 @@ uint32 *copyPd(uint32* pd) //When calling this function: //If it is intended to alloc kernel memory, v_addr must be < KERN_HEAP_END. //If it is intended to alloc user memory, v_addr must be > KERN_HEAP_END. -BOOL addPageToPd(uint32* pd, char *v_addr, char *p_addr, int flags) -{ +BOOL addPageToPd(uint32* pd, char *v_addr, char *p_addr, int flags) { uint32 *pde = NULL; //printkf("DEBUG: addPageToPd(): v_addr:%x p_addr:%x flags:%x\n", v_addr, p_addr, flags); @@ -235,8 +204,7 @@ BOOL addPageToPd(uint32* pd, char *v_addr, char *p_addr, int flags) int index = (((uint32) v_addr & 0xFFC00000) >> 22); pde = pd + index; - if ((*pde & PG_PRESENT) == PG_PRESENT) - { + if ((*pde & PG_PRESENT) == PG_PRESENT) { //Already assigned! Debug_PrintF("ERROR: addPageToPd(): pde:%x is already assigned!!\n", pde); return FALSE; @@ -251,21 +219,16 @@ BOOL addPageToPd(uint32* pd, char *v_addr, char *p_addr, int flags) asm("invlpg %0"::"m"(v_addr)); - if (v_addr <= (char*)(KERN_HEAP_END - PAGESIZE_4M)) - { - if (pd == gKernelPageDirectory) - { + if (v_addr <= (char*)(KERN_HEAP_END - PAGESIZE_4M)) { + if (pd == gKernelPageDirectory) { syncPageDirectoriesKernelMemory(); } - else - { + else { PANIC("Attemped to allocate kernel memory to a page directory which is not the kernel page directory!!!\n"); } } - else - { - if (pd == gKernelPageDirectory) - { + else { + if (pd == gKernelPageDirectory) { //No panic here. Because we allow kernel to map anywhere! } } @@ -273,16 +236,13 @@ BOOL addPageToPd(uint32* pd, char *v_addr, char *p_addr, int flags) return TRUE; } -BOOL removePageFromPd(uint32* pd, char *v_addr, BOOL releasePageFrame) -{ +BOOL removePageFromPd(uint32* pd, char *v_addr, BOOL releasePageFrame) { int index = (((uint32) v_addr & 0xFFC00000) >> 22); uint32* pde = pd + index; - if ((*pde & PG_PRESENT) == PG_PRESENT) - { + if ((*pde & PG_PRESENT) == PG_PRESENT) { uint32 p_addr = *pde & 0xFFC00000; - if (releasePageFrame) - { + if (releasePageFrame) { releasePageFrame4M(p_addr); } @@ -290,10 +250,8 @@ BOOL removePageFromPd(uint32* pd, char *v_addr, BOOL releasePageFrame) asm("invlpg %0"::"m"(v_addr)); - if (v_addr <= (char*)(KERN_HEAP_END - PAGESIZE_4M)) - { - if (pd == gKernelPageDirectory) - { + if (v_addr <= (char*)(KERN_HEAP_END - PAGESIZE_4M)) { + if (pd == gKernelPageDirectory) { syncPageDirectoriesKernelMemory(); } } @@ -304,24 +262,18 @@ BOOL removePageFromPd(uint32* pd, char *v_addr, BOOL releasePageFrame) return FALSE; } -static void syncPageDirectoriesKernelMemory() -{ +static void syncPageDirectoriesKernelMemory() { //get page directory list //it can be easier to traverse proccesses(and access its pd) here - for (int byte = 0; byte < RAM_AS_4M_PAGES / 8; byte++) - { - if (gKernelPageHeapBitmap[byte] != 0xFF) - { - for (int bit = 0; bit < 8; bit++) - { - if ((gKernelPageHeapBitmap[byte] & (1 << bit))) - { + for (int byte = 0; byte < RAM_AS_4M_PAGES / 8; byte++) { + if (gKernelPageHeapBitmap[byte] != 0xFF) { + for (int bit = 0; bit < 8; bit++) { + if ((gKernelPageHeapBitmap[byte] & (1 << bit))) { int page = 8 * byte + bit; uint32* pd = (uint32*)(page * PAGESIZE_4K); - for (int i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) - { + for (int i = 0; i < KERNELMEMORY_PAGE_COUNT; ++i) { pd[i] = gKernelPageDirectory[i]; } } @@ -330,18 +282,14 @@ static void syncPageDirectoriesKernelMemory() } } -uint32 getTotalPageCount() -{ +uint32 getTotalPageCount() { return gTotalPageCount; } -uint32 getUsedPageCount() -{ +uint32 getUsedPageCount() { int count = 0; - for (int i = 0; i < gTotalPageCount; ++i) - { - if(IS_PAGEFRAME_USED(gPhysicalPageFrameBitmap, i)) - { + for (int i = 0; i < gTotalPageCount; ++i) { + if(IS_PAGEFRAME_USED(gPhysicalPageFrameBitmap, i)) { ++count; } } @@ -349,13 +297,11 @@ uint32 getUsedPageCount() return count; } -uint32 getFreePageCount() -{ +uint32 getFreePageCount() { return gTotalPageCount - getUsedPageCount(); } -static void printPageFaultInfo(uint32 faultingAddress, Registers *regs) -{ +static void printPageFaultInfo(uint32 faultingAddress, Registers *regs) { int present = regs->errorCode & 0x1; int rw = regs->errorCode & 0x2; int us = regs->errorCode & 0x4; @@ -365,21 +311,18 @@ static void printPageFaultInfo(uint32 faultingAddress, Registers *regs) printkf("Page fault!!! When trying to %s %x - IP:%x\n", rw ? "write to" : "read from", faultingAddress, regs->eip); printkf("The page was %s\n", present ? "present" : "not present"); - if (reserved) - { + if (reserved) { printkf("Reserved bit was set\n"); } - if (id) - { + if (id) { printkf("Caused by an instruction fetch\n"); } printkf("CPU was in %s\n", us ? "user-mode" : "supervisor mode"); } -static void handlePageFault(Registers *regs) -{ +static void handlePageFault(Registers *regs) { // A page fault has occurred. // The faulting address is stored in the CR2 register. @@ -390,30 +333,25 @@ static void handlePageFault(Registers *regs) //Debug_PrintF("stack of handler is %x\n", &faultingAddress); Thread* faultingThread = getCurrentThread(); - if (NULL != faultingThread) - { + if (NULL != faultingThread) { Thread* mainThread = getMainKernelThread(); - if (mainThread == faultingThread) - { + if (mainThread == faultingThread) { printPageFaultInfo(faultingAddress, regs); PANIC("Page fault in Kernel main thread!!!"); } - else - { + else { printPageFaultInfo(faultingAddress, regs); Debug_PrintF("Faulting thread is %d\n", faultingThread->threadId); - if (faultingThread->userMode) - { + if (faultingThread->userMode) { Debug_PrintF("Destroying process %d\n", faultingThread->owner->pid); destroyProcess(faultingThread->owner); } - else - { + else { Debug_PrintF("Destroying kernel thread %d\n", faultingThread->threadId); destroyThread(faultingThread); @@ -422,26 +360,22 @@ static void handlePageFault(Registers *regs) waitForSchedule(); } } - else - { + else { printPageFaultInfo(faultingAddress, regs); PANIC("Page fault!!!"); } } -void initializeProcessMmap(Process* process) -{ +void initializeProcessMmap(Process* process) { int page = 0; - for (page = 0; page < RAM_AS_4M_PAGES / 8; ++page) - { + for (page = 0; page < RAM_AS_4M_PAGES / 8; ++page) { process->mmappedVirtualMemory[page] = 0xFF; } //Virtual pages reserved for mmap - for (page = PAGE_INDEX_4M(USER_OFFSET_MMAP); page < (int)(PAGE_INDEX_4M(USER_OFFSET_MMAP_END)); ++page) - { + for (page = PAGE_INDEX_4M(USER_OFFSET_MMAP); page < (int)(PAGE_INDEX_4M(USER_OFFSET_MMAP_END)); ++page) { //? printkf("reserving for mmap: %x\n", page*PAGESIZE_4M); SET_PAGEFRAME_UNUSED(process->mmappedVirtualMemory, page * PAGESIZE_4M); } @@ -449,10 +383,8 @@ void initializeProcessMmap(Process* process) //this functions uses either pAddress or pAddressList //both of them must not be null! -void* mapMemory(Process* process, uint32 nBytes, uint32 pAddress, List* pAddressList) -{ - if (nBytes == 0) - { +void* mapMemory(Process* process, uint32 nBytes, uint32 pAddress, List* pAddressList) { + if (nBytes == 0) { return NULL; } @@ -460,15 +392,12 @@ void* mapMemory(Process* process, uint32 nBytes, uint32 pAddress, List* pAddress int neededPages = (nBytes / PAGESIZE_4M) + 1; - if (pAddressList) - { - if (List_GetCount(pAddressList) < neededPages) - { + if (pAddressList) { + if (List_GetCount(pAddressList) < neededPages) { return NULL; } } - else if (0 == pAddress) - { + else if (0 == pAddress) { return NULL; } @@ -476,61 +405,50 @@ void* mapMemory(Process* process, uint32 nBytes, uint32 pAddress, List* pAddress uint32 vMem = 0; - for (pageIndex = PAGE_INDEX_4M(USER_OFFSET_MMAP); pageIndex < (int)(PAGE_INDEX_4M(USER_OFFSET_MMAP_END)); ++pageIndex) - { - if (IS_PAGEFRAME_USED(process->mmappedVirtualMemory, pageIndex)) - { + for (pageIndex = PAGE_INDEX_4M(USER_OFFSET_MMAP); pageIndex < (int)(PAGE_INDEX_4M(USER_OFFSET_MMAP_END)); ++pageIndex) { + if (IS_PAGEFRAME_USED(process->mmappedVirtualMemory, pageIndex)) { foundAdjacent = 0; vMem = 0; } - else - { - if (0 == foundAdjacent) - { + else { + if (0 == foundAdjacent) { vMem = pageIndex * PAGESIZE_4M; } ++foundAdjacent; } - if (foundAdjacent == neededPages) - { + if (foundAdjacent == neededPages) { break; } } //Debug_PrintF("mapMemory: needed:%d foundAdjacent:%d vMem:%x\n", neededPages, foundAdjacent, vMem); - if (foundAdjacent == neededPages) - { + if (foundAdjacent == neededPages) { uint32 p = 0; ListNode* pListNode = NULL; - if (pAddressList) - { + if (pAddressList) { pListNode = List_GetFirstNode(pAddressList); p = (uint32)(uint32*)pListNode->data; } - else - { + else { p = pAddress; } p = p & 0xFFC00000; uint32 v = vMem; - for (int i = 0; i < neededPages; ++i) - { + for (int i = 0; i < neededPages; ++i) { addPageToPd(process->pd, (char*)v, (char*)p, PG_USER); SET_PAGEFRAME_USED(process->mmappedVirtualMemory, PAGE_INDEX_4M(v)); v += PAGESIZE_4M; - if (pAddressList) - { + if (pAddressList) { pListNode = pListNode->next; p = (uint32)(uint32*)pListNode->data; p = p & 0xFFC00000; } - else - { + else { p += PAGESIZE_4M; } } @@ -541,15 +459,12 @@ void* mapMemory(Process* process, uint32 nBytes, uint32 pAddress, List* pAddress return NULL; } -BOOL unmapMemory(Process* process, uint32 nBytes, uint32 vAddress) -{ - if (nBytes == 0) - { +BOOL unmapMemory(Process* process, uint32 nBytes, uint32 vAddress) { + if (nBytes == 0) { return FALSE; } - if (vAddress < USER_OFFSET_MMAP) - { + if (vAddress < USER_OFFSET_MMAP) { return FALSE; } @@ -562,10 +477,8 @@ BOOL unmapMemory(Process* process, uint32 nBytes, uint32 vAddress) BOOL result = FALSE; - for (pageIndex = startIndex; pageIndex < endIndex; ++pageIndex) - { - if (IS_PAGEFRAME_USED(process->mmappedVirtualMemory, pageIndex)) - { + for (pageIndex = startIndex; pageIndex < endIndex; ++pageIndex) { + if (IS_PAGEFRAME_USED(process->mmappedVirtualMemory, pageIndex)) { char* vAddr = (char*)(pageIndex * PAGESIZE_4M); removePageFromPd(process->pd, vAddr, FALSE); |