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Working on Paging API #67

This commit is contained in:
Adrien Bourmault 2020-01-11 00:05:34 +01:00
parent ee73150891
commit 40cd623b97
1 changed files with 14 additions and 14 deletions
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28
kaleid/kernel/mm/paging.c
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@ -14,8 +14,6 @@
pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE))); pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE)));
ulong *MmPhysicalPageTable; ulong *MmPhysicalPageTable;
extern MemoryMap_t memoryMap;
extern ulong _text; extern ulong _text;
extern ulong _text_end; extern ulong _text_end;
extern ulong _rodata; extern ulong _rodata;
@ -23,9 +21,11 @@ extern ulong _rodata_end;
extern ulong _data; extern ulong _data;
extern ulong _data_end; extern ulong _data_end;
extern MemoryMap_t memoryMap;
ulong MmStackGuards[2] = { 0 }; ulong MmStackGuards[2] = { 0 };
ulong MmVirtLastAddress = 0; ulong MmVirtLastAddress = 0;
ulong MmPhysLastKernelAddress = 0; ulong MmPhysLastKernAddress = 0;
enum enum
{ {
@ -59,8 +59,8 @@ void MmInitPaging(void)
ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize; ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
// Difference between the end of kernel and the begin of userspace // Difference between the end of kernel and the begin of userspace
MmPhysLastKernelAddress = (ulong)(_heap_start + _heap_max); MmPhysLastKernAddress = (ulong)(_heap_start + _heap_max);
ulong diffKernUsr = (ulong)USERSPACE - MmPhysLastKernelAddress - KPAGESIZE; ulong diffKernUsr = (ulong)USERSPACE - MmPhysLastKernAddress - KPAGESIZE;
// Maximum VIRTUAL address in memory // Maximum VIRTUAL address in memory
MmVirtLastAddress = phRamSize + diffKernUsr; MmVirtLastAddress = phRamSize + diffKernUsr;
@ -161,22 +161,22 @@ void MmInitPaging(void)
//DebugLog("\tSection .rodata at %p\n", curAddrPT); //DebugLog("\tSection .rodata at %p\n", curAddrPT);
} }
// While we're inside the kernel pages // While we're inside the kernel pages
else if ((ulong)curAddrPT <= MmPhysLastKernelAddress) { else if ((ulong)curAddrPT <= MmPhysLastKernAddress) {
MmPT[index] = (ulong)curAddrPT | PRESENT | READWRITE; MmPT[index] = (ulong)curAddrPT | PRESENT | READWRITE;
MmPhysicalPageTable[xedni] = (ulong)curAddrPT; MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
if ((ulong)curAddrPT == MmPhysLastKernelAddress) { if ((ulong)curAddrPT == MmPhysLastKernAddress) {
//DebugLog("\tLast page of kernel at %p\n", curAddrPT); //DebugLog("\tLast page of kernel at %p\n", curAddrPT);
} }
} }
// While we're inside the userspace pages // While we're inside the userspace pages
else if ((ulong)curAddrPT >= USERSPACE) { else if ((ulong)curAddrPT >= USERSPACE) {
MmPT[index] = ((ulong)curAddrPT - diffKernUsr); // Not present for instance, unallocated MmPT[index] = ((ulong)curAddrPT - diffKernUsr) | PRESENT; // Not present for instance
xedni = (((ulong)curAddrPT - diffKernUsr) / ((ulong)KPAGESIZE)); xedni = (((ulong)curAddrPT - diffKernUsr) / ((ulong)KPAGESIZE));
MmPhysicalPageTable[xedni] = (ulong)curAddrPT; MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
if ((ulong)curAddrPT == USERSPACE) { if ((ulong)curAddrPT == USERSPACE) {
//DebugLog("\tUserspace at %p:%p\n", curAddrPT, curAddrPT - diffKernUsr); DebugLog("\tUserspace at %p:%p\n", curAddrPT, curAddrPT - diffKernUsr);
} }
} }
else { else {
@ -229,7 +229,7 @@ void *MmTransVirtToPhyAddr(void* virtualAddr)
ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1)); ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr); pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr);
if (*page & PRESENT) { if (*page == (*page & ~(KPAGESIZE - 1))) {
return NULL; return NULL;
} }
@ -241,7 +241,7 @@ void *MmTransPhyToVirtAddr(void* physicalAddr)
ulong phyAddrPage = (ulong)physicalAddr & ( ~(KPAGESIZE - 1)); ulong phyAddrPage = (ulong)physicalAddr & ( ~(KPAGESIZE - 1));
return (void*)( MmPhysicalPageTable[(ulong)physicalAddr return (void*)( MmPhysicalPageTable[(ulong)physicalAddr
/ ((ulong)KPAGESIZE) / ((ulong)KPAGESIZE)
+ ((ulong)physicalAddr - phyAddrPage) ] ); ] + ((ulong)physicalAddr - phyAddrPage));
} }
// //
@ -287,13 +287,13 @@ void MmUnmapPage(void* virtualAddr)
{ {
pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr); pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr);
*page &= (~PRESENT); *page = 0;
KeFlushTlbSingle(*page); KeFlushTlbSingle(*page);
} }
// //
// Find physical unallocated pages // Find a free block of pages
// //
void *MmGetPhyPageBlock(size_t size, bool usermode) { void *MmGetPhyPageBlock(size_t size, bool usermode) {
void *startPhyPage = 0; void *startPhyPage = 0;
@ -307,7 +307,7 @@ void *MmGetPhyPageBlock(size_t size, bool usermode) {
if (!usermode) { if (!usermode) {
startPhyPage = MmTransVirtToPhyAddr((void*)KPAGESIZE + 1); startPhyPage = MmTransVirtToPhyAddr((void*)KPAGESIZE + 1);
endPhyPage = (void*)MmPhysLastKernelAddress; endPhyPage = (void*)MmPhysLastKernAddress;
} else { } else {
startPhyPage = MmTransVirtToPhyAddr((void*)USERSPACE); startPhyPage = MmTransVirtToPhyAddr((void*)USERSPACE);
endPhyPage = (void*)(phRamSize & ~(KPAGESIZE - 1)); endPhyPage = (void*)(phRamSize & ~(KPAGESIZE - 1));