Added some handy address conversion macros.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8041 a95241bf-73f2-0310-859d-f6bbb57e9c96
2004-06-18 13:23:34 +00:00
parent 1889be2a4d
commit 7fe1bdeec9
1 changed files with 7 additions and 0 deletions
@@ -24,6 +24,13 @@ struct bios_regs {
 };

 #define CARRY_FLAG	0x01
+#define ZERO_FLAG	0x40
+
+#define ADDRESS_SEGMENT(address) ((addr_t)(address) >> 4)
+#define ADDRESS_OFFSET(address) ((addr_t)(address) & 0xf)
+#define LINEAR_ADDRESS(segment, offset) (((addr_t)(segment) << 4) + (addr_t)(offset))
+#define SEGMENTED_TO_LINEAR(segmented) \
+	LINEAR_ADDRESS((addr_t)(segmented) >> 16, (addr_t)(segmented) & 0xffff)

 static const addr_t kDataSegmentScratch = 0x10020;	// about 768 bytes
 static const addr_t kDataSegmentBase = 0x10000;