Kernel - Fixing very slow CheckMem function

[tpg/acess2.git] / Kernel / arch / armv7 / mm_virt.c

diff --git a/Kernel/arch/armv7/mm_virt.c b/Kernel/arch/armv7/mm_virt.c
index 64b5d57..d74313f 100644 (file)
--- a/Kernel/arch/armv7/mm_virt.c
+++ b/Kernel/arch/armv7/mm_virt.c
@@ -391,6 +391,33 @@ void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
        MM_int_SetPageInfo(VAddr, &pi);
 }
 
+int MM_IsValidBuffer(tVAddr Addr, size_t Size)
+{
+       tMM_PageInfo    pi;
+        int    bUser = 0;
+       
+       Size += Addr & (PAGE_SIZE-1);
+       Addr &= ~(PAGE_SIZE-1);
+
+       if( MM_int_GetPageInfo(Addr, &pi) )     return 0;
+       Addr += PAGE_SIZE;
+
+       if(pi.AP != AP_KRW_ONLY && pi.AP != AP_KRO_ONLY)
+               bUser = 1;
+
+       while( Size >= PAGE_SIZE )
+       {
+               if( MM_int_GetPageInfo(Addr, &pi) )
+                       return 0;
+               if(bUser && (pi.AP == AP_KRW_ONLY || pi.AP == AP_KRO_ONLY))
+                       return 0;
+               Addr += PAGE_SIZE;
+               Size -= PAGE_SIZE;
+       }
+       
+       return 1;
+}
+
 int MM_Map(tVAddr VAddr, tPAddr PAddr)
 {
        tMM_PageInfo    pi = {0};
@@ -923,6 +950,8 @@ void MM_DumpTables(tVAddr Start, tVAddr End)
         int    i = 0, inRange=0;
        
        pi_old.Size = 0;
+       pi_old.AP = 0;
+       pi_old.PhysAddr = 0;
 
        Debug("Page Table Dump (%p to %p):", Start, End);
        range_start = Start;