Kernel/x86 - Hack to return quickly when mapping <1MiB addreses

diff --git a/KernelLand/Kernel/arch/x86/mm_virt.c b/KernelLand/Kernel/arch/x86/mm_virt.c
index 0eb60a1..216bc1e 100644 (file)
--- a/KernelLand/Kernel/arch/x86/mm_virt.c
+++ b/KernelLand/Kernel/arch/x86/mm_virt.c
@@ -1029,12 +1029,17 @@ void MM_FreeTemp(void *VAddr)
  */
 void *MM_MapHWPages(tPAddr PAddr, Uint Number)
 {
-        int    i, j;
+        int    j;
        
        PAddr &= ~0xFFF;
-       
+
+       if( PAddr < 1024*1024 && (1024*1024-PAddr) >= Number * PAGE_SIZE )
+       {
+               return (void*)(KERNEL_BASE + PAddr);
+       }
+
        // Scan List
-       for( i = 0; i < NUM_HW_PAGES; i ++ )
+       for( int i = 0; i < NUM_HW_PAGES; i ++ )
        {               
                // Check if addr used
                if( gaPageTable[ (HW_MAP_ADDR >> 12) + i ] & 1 )
@@ -1137,7 +1142,11 @@ void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
         int    i, j;
        
        //Log_Debug("VirtMem", "MM_UnmapHWPages: (VAddr=0x%08x, Number=%i)", VAddr, Number);
-       
+
+       //
+       if( KERNEL_BASE <= VAddr && VAddr < KERNEL_BASE + 1024*1024 )
+               return ;        
+
        // Sanity Check
        if(VAddr < HW_MAP_ADDR || VAddr+Number*0x1000 > HW_MAP_MAX)     return;