Changeset 58777 in vbox for trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SlabInit.c

Timestamp:

Nov 19, 2015 5:20:00 PM (9 years ago)

Author:

vboxsync

Message:

bs3kit: Core allocator code.

File:

• trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SlabInit.c (modified) (3 diffs)

trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SlabInit.c

@@ -1 +1 @@
 /* $Id$ */
 /** @file
- * BS3Kit - Bs3SlabListAdd
+ * BS3Kit - Bs3SlabInit
  */
 
@@ -31 +31 @@
 BS3_DECL(void) Bs3SlabInit(PBS3SLABCLT pSlabCtl, size_t cbSlabCtl, uint32_t uFlatSlabPtr, uint32_t cbSlab, uint16_t cbChunk)
 {
+    uint16_t cBits;
     BS3_ASSERT(RT_IS_POWER_OF_TWO(cbChunk));
     BS3_ASSERT(cbSlab >= cbChunk * 4);
@@ -39 +40 @@
     BS3_XPTR_SET_FLAT(BS3SLABCLT, pSlabCtl->pbStart, uFlatSlabPtr);
     pSlabCtl->cbChunk           = cbChunk;
-    pSlabCtl->cChunks           = cbSlab / cbChunk;
+    pSlabCtl->cChunkShift       = ASMBitFirstSetU16(cbChunk) - 1;
+    pSlabCtl->cChunks           = cbSlab >> pSlabCtl->cChunkShift;
     pSlabCtl->cFreeChunks       = pSlabCtl->cChunks;
-    pSlabCtl->cBits             = RT_ALIGN_T(pSlabCtl->cChunks, 32, uint16_t);
-    BS3_ASSERT(cbSlabCtl >= RT_OFFSETOF(BS3SLABCTL, bmAllocated[pSlabCtl->cBits >> 3]));
-    Bs3MemZero(&pSlabCtl->bmAllocated, pSlabCtl->cBits >> 3);
+    cBits                       = RT_ALIGN_T(pSlabCtl->cChunks, 32, uint16_t);
+    BS3_ASSERT(cbSlabCtl >= RT_OFFSETOF(BS3SLABCTL, bmAllocated[cBits >> 3]));
+    Bs3MemZero(&pSlabCtl->bmAllocated, cBits >> 3);
 
     /* Mark excess bitmap padding bits as allocated. */
-    if (pSlabCtl->cBits != pSlabCtl->cChunks)
+    if (cBits != pSlabCtl->cChunks)
     {
         uint16_t iBit;
-        for (iBit = pSlabCtl->cChunks; iBit < pSlabCtl->cBits; iBit++)
+        for (iBit = pSlabCtl->cChunks; iBit < cBits; iBit++)
             ASMBitSet(pSlabCtl->bmAllocated, iBit);
     }