/*
- AcessOS Microkernel Version
- mm_phys.c
-*/
+ * Acess2
+ * - Physical memory manager
+ */
+#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;
}
}
for(a=0;gaSuperBitmap[a]==-1&&a<num;a++);
if(a == num) {
RELEASE( &giPhysAlloc );
- Warning("MM_AllocPhys - OUT OF MEMORY\n");
+ Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
return 0;
}
for(b=0;gaSuperBitmap[a]&(1<<b);b++);
for(c=0;gaPageBitmap[a*32+b]&(1<<c);c++);
- //for(c=0;gaPageReferences[a*32*32+b*32+c]>0;c++);
// Mark page used
if(gaPageReferences)
// Release Spinlock
RELEASE( &giPhysAlloc );
- //LOG("ret = %x", ret);
+
+ return ret;
+}
+
+/**
+ * \fn tPAddr MM_AllocPhysRange(int Pages)
+ * \brief Allocate a range of physical pages
+ * \param Pages Number of pages to allocate
+ */
+tPAddr MM_AllocPhysRange(int Pages)
+{
+ int num = giPageCount / 32 / 32;
+ int a, b, c;
+ Uint32 ret;
+
+ LOCK( &giPhysAlloc );
+
+ // Find free page
+ 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++);
+ for(c=0;gaPageBitmap[a*32+b]&(1<<c);c++);
+
+ // Mark page used
+ if(gaPageReferences)
+ gaPageReferences[a*32*32+b*32+c] = 1;
+ gaPageBitmap[ a*32+b ] |= 1 << c;
+
+ // Get address
+ ret = (a << 22) + (b << 17) + (c << 12);
+
+ // Mark used block
+ if(gaPageBitmap[ a*32+b ] == -1) gaSuperBitmap[a] |= 1 << b;
+
+ // Release Spinlock
+ RELEASE( &giPhysAlloc );
+
return ret;
}
// 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));