Kernel: use 22.10 fixed point arithmetic in HPET timestamp calculation.

git-svn-id: svn://kolibrios.org@5791 a494cfbc-eb01-0410-851d-a64ba20cac60
2015-09-04 11:50:27 +00:00
parent 86fb4bfe83
commit a410b6abe3
2 changed files with 22 additions and 10 deletions
--- a/kernel/trunk/init.inc
+++ b/kernel/trunk/init.inc
@@ -623,10 +623,12 @@ init_hpet:
        mov     ecx, eax

        mov     eax, [ebx+HPET_PERIOD]
-        mov     edx, 0x431BDE83
-        mul     edx
-        shr     edx, 18
-        mov     [hpet_period-OS_BASE], edx
+        xor     edx, edx
+        shld    edx, eax, 10
+        shl     eax, 10
+        mov     esi, 1000000
+        div     esi
+        mov     [hpet_period-OS_BASE], eax

        mov     esi, [ebx+HPET_CFG]
        and     esi, not HPET_CFG_ENABLE