AcessOS Microkernel Version
mm_phys.c
*/
+#define DEBUG 1
#include <common.h>
#include <mboot.h>
#include <mm_virt.h>
// Initialise globals
giPageCount = (MBoot->HighMem >> 2) + 256; // HighMem is a kByte value
- Log("giPageCount = %i", giPageCount);
+ LOG("giPageCount = %i", giPageCount);
// Get used page count
kernelPages = (Uint)&gKernelEnd - KERNEL_BASE;
}
// Allocate References
- Log("Reference Pages %i", (giPageCount*4+0xFFF)>>12);
+ LOG("Reference Pages %i", (giPageCount*4+0xFFF)>>12);
for(num = 0; num < (giPageCount*4+0xFFF)>>12; num++)
{
MM_Allocate( REFERENCE_BASE + (num<<12) );
memsetd(gaPageReferences, 1, kernelPages);
for( num = kernelPages; num < giPageCount; num++ )
{
- //if(gaPageBitmap[ num2 / 32 ] == 0) {
- // memsetd(&gaPageReferences[num2], 0, 31-(num2&31));
- // num2 = (num2 + 32) & ~31;
- //} else
- gaPageReferences[num] = (gaPageBitmap[ num / 32 ] >> (num&31)) & 1;
+ gaPageReferences[num] = (gaPageBitmap[ num / 32 ] >> (num&31)) & 1;
}
}
/**
- * \fn Uint32 MM_AllocPhys()
+ * \fn tPAddr MM_AllocPhys()
* \brief Allocates a physical page
*/
tPAddr MM_AllocPhys()
for(a=0;gaSuperBitmap[a]==-1&&a<num;a++);
if(a == num) {
RELEASE( &giPhysAlloc );
+ Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
return 0;
}
for(b=0;gaSuperBitmap[a]&(1<<b);b++);
// Release Spinlock
RELEASE( &giPhysAlloc );
+ //LOG("Allocated 0x%x\n", ret);
//LOG("ret = %x", ret);
return ret;
}
/**
* \fn void MM_DerefPhys(Uint32 Addr)
*/
-void MM_DerefPhys(Uint32 Addr)
+void MM_DerefPhys(tPAddr Addr)
{
// Get page number
Addr >>= 12;
// Mark as free in bitmaps
if( gaPageReferences[ Addr ] == 0 )
{
+ //LOG("Freed 0x%x by %p\n", Addr<<12, __builtin_return_address(0));
gaPageBitmap[ Addr / 32 ] &= ~(1 << (Addr&31));
if(gaPageReferences[ Addr ] == 0)
gaSuperBitmap[ Addr >> 10 ] &= ~(1 << ((Addr >> 5)&31));
// Release spinlock
RELEASE( &giPhysAlloc );
}
+
+/**
+ * \fn int MM_GetRefCount(tPAddr Addr)
+ */
+int MM_GetRefCount(tPAddr Addr)
+{
+ // Get page number
+ Addr >>= 12;
+
+ // We don't care about non-ram pages
+ if(Addr >= giPageCount) return -1;
+
+ // Check if it is freed
+ return gaPageReferences[ Addr ];
+}