Working on page allocator (3) #67

include/mm/palloc.h

@@ -31,7 +31,15 @@
 
 //----------------------------------------------------------------------------//
 
+typedef struct AllocatedPage_t{
+    void *phyAddress;
+    ulong id;
+    struct AllocatedPage_t *next;
+} AllocatedPage_t;
 
+//----------------------------------------------------------------------------//
+
+error_t MmGetFreePageFrame(void **framePtr, size_t *pageNumber, size_t size);
 
 //----------------------------------------------------------------------------//
 

kaleid/kernel/mm/paging.c

@@ -78,6 +78,8 @@ void MmInitPaging(void)
     ulong lastDirectoryAddr = 0;
     ulong phDirSize = 0;
 
+    KernLog("\tActivating paging...\n");
+
     // Maximum PHYSICAL address in memory
     ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
 
@@ -214,7 +216,7 @@ void MmInitPaging(void)
     lastDirectoryAddr = (ulong)MmPT;
 
     MmLoadPML4((void *)MmPageMapLevel4);
-    //MmEnableWriteProtect();
+    MmEnableWriteProtect();
 
     DebugLog("\tPage table size : %u MB\n", (lastDirectoryAddr - firstDirectoryAddr + phDirSize)/MB);
 }
@@ -415,5 +417,5 @@ static void PagingHandler(ISRFrame_t *regs)
 void MmActivatePageHandler(void)
 {
     KeRegisterISR(PagingHandler, 0xe);
-    DebugLog("\tPaging activated\n");
+    //DebugLog("\tPage handler activated\n");
 }

kaleid/kernel/mm/palloc.c

@@ -37,22 +37,35 @@ enum
     Whatever2          = 1UL << 62
 };
 
-typedef struct {
-    void **FramePtr;
-    int pageNumber;
-} FramePtr_t;
+static AllocatedPage_t busyPagesList = { (void*)0, 0, (AllocatedPage_t*)0 };
 
 //---------
 
+static bool MmIsPageBusy(void *phyAddr) {
+    AllocatedPage_t *busyPage = &busyPagesList;
+    bool isBusy = false;
+
+    while(busyPage->next) {
+        busyPages = busyPage->next;
+        DebugLog("Busy page at %p\n", busyPage->phyAddress);
+
+        if (phyPageAddr == busyPage->phyAddress) {
+            isBusy = true;
+            break;
+        }
+    }
+
+    return isBusy;
+}
+
 //
 // Returns a structure that describes a pageframe
 //
-/* FramePtr_t MmAllocPageBlock(size_t size) { */
-/*     ulong pageNumber = (ulong)size / KPAGESIZE; */
+error_t MmGetFreePageFrame(void **framePtr, size_t *pageNumber, size_t size) {
+    *pageNumber = (ulong)size / KPAGESIZE;
 
-
-/*     return (FramePtr_t)0; */
-/* } */
+    return EOK;
+}
 
 
 

kaleid/kernel/sh/testcmds.c

@@ -24,6 +24,7 @@
 
 #include <vers.h>
 #include <mm/paging.h>
+#include <mm/palloc.h>
 #include <mm/map.h>
 #include <io/ata.h>
 #include <io/vga.h>
@@ -256,9 +257,10 @@ error_t CmdPageBlock(int argc, char **argv, char *cmdline)
     size_t size = (size_t)atoi(argv[1]);
     bool usermode = (bool)atoi(argv[2]);
 
-    //MmGetPhyPageBlock(size, usermode);
+    size_t pageNum = 0;
 
-    return EOK;
+    error_t err = MmGetFreePageFrame((void**)0x12345678, &pageNum, (size_t)4096);
+    return err;
 }
 
 error_t CmdPF(int argc, char **argv, char *cmdline)