From a0a7d73a053d50434835bda0ccbb132839adb5ce Mon Sep 17 00:00:00 2001
From: Connor Wood <connorwood71@gmail.com>
Date: Fri, 14 Jul 2017 20:22:11 +0100
Subject: [PATCH] Removed PIT code
---
x86_64/initialize.asm | 35 -----------------------------------
x86_64/startup-common.asm | 4 ----
2 files changed, 39 deletions(-)
diff --git a/x86_64/initialize.asm b/x86_64/initialize.asm
index 90a42d4..e0ac449 100644
--- a/x86_64/initialize.asm
+++ b/x86_64/initialize.asm
@@ -18,38 +18,3 @@ initialize:
or ax, 0000011000000000b
mov cr4, eax
ret
-
-;PIT Frequency
-;If using nanoseconds, to minimize drift, one should find a frequency as close to an integer nanosecond value in wavelength
-;Divider Hz Nanoseconds Properties
-;2685 444.38795779019242706393 2250286.00003631746492922946 Best For Context Switching
-;5370 222.19397889509621353196 4500572.00007263492985856020
-;21029 56.73981961418358774390 17624306.99991199998882825455
-;23714 50.31549576902532962244 19874592.99994831745375667118
-;26399 45.19798729749864262535 22124878.99998463491868476373
-;29084 41.02536331545408701233 24375165.00002095238361424615
-;31769 37.55804925136663623868 26625451.00005726984854313455
-;34454 34.63115071302799868423 28875737.00009358731347639618
-;50113 23.80982313305263437963 41999471.99993295237244784676
-;52798 22.59899364874932131267 44249757.99996926983737931766
-;55483 21.50535599492937776736 46500044.00000558730230583335 Lowest Drift
-;58168 20.51268165772704350616 48750330.00004190476724037528
-;60853 19.60760630809765610021 51000616.00007822223218031738
-
-.pit:
- ;initialize the PIT
- mov ax, 2685 ;this is the divider for the PIT
- out 0x40, al
- rol ax, 8
- out 0x40, al
- ;DISABLED ;enable rtc interrupt
- ;mov al, 0xB
- ;out 0x70, al
- ;rol ax, 8
- ;in al, 0x71
- ;rol ax, 8
- ;out 0x70, al
- ;rol ax, 8
- ;or al, 0x40
- ;out 0x71, al
- ret
diff --git a/x86_64/startup-common.asm b/x86_64/startup-common.asm
index fb29d7f..5fd0834 100644
--- a/x86_64/startup-common.asm
+++ b/x86_64/startup-common.asm
@@ -41,10 +41,6 @@ startup:
call printrm
call initialize.sse
- mov si, init_pit_msg
- call printrm
- call initialize.pit
-
mov si, startup_arch_msg
call printrm
--
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