From af78ad21cdd2c1ff6f1df327b602d2e0e9db4c08 Mon Sep 17 00:00:00 2001
From: xamidev <qelal@batareika.com>
Date: Tue, 16 Jul 2024 22:00:07 +0200
Subject: [PATCH] Add: PIT (sysclock)

---
 iso/boot/kernel.elf | Bin 20624 -> 20864 bytes
 kernel.elf          | Bin 20624 -> 20864 bytes
 kmain.c             |  25 ++-----------------------
 makefile            |   2 +-
 os.iso              | Bin 497664 -> 497664 bytes
 system.h            |   3 +++
 timer.c             |  26 ++++++++++++++++++++++++++
 7 files changed, 32 insertions(+), 24 deletions(-)
 create mode 100644 timer.c

diff --git a/iso/boot/kernel.elf b/iso/boot/kernel.elf
index 12cf0136f41a092f6cdab3afaf5b4f50947252ea..a95472e29547a9a22f8c7e4e73efe496359b8372 100755
GIT binary patch
delta 4247
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diff --git a/kernel.elf b/kernel.elf
index 12cf0136f41a092f6cdab3afaf5b4f50947252ea..a95472e29547a9a22f8c7e4e73efe496359b8372 100755
GIT binary patch
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delta 4078
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diff --git a/kmain.c b/kmain.c
index 7f55655..82e269e 100644
--- a/kmain.c
+++ b/kmain.c
@@ -23,34 +23,13 @@ int kmain(int retvalue)
 
   clear();
 
-  // printf testing
+  colorputs("Blank OS version 1 iteration 3 minor 20\n", 10);
 
   // TODO: Framebuffer upgrade: color output
   // TODO: Serial printf to dump registers on kernel panic
   // TODO: Fix scrolling bug (framebuffer driver)
 
-  int age = 34;
-  int problems = 124;
-  char* name = "xamidev"; 
-  
-  printf("Hello %s, you are %d years old and have %d problems. wow %%\n", name, age, problems);
-  
-  long suchwow = 2934342;
-  char character = 65;
-  printf("such number %u\nsuch character %c", suchwow, character);
-  
-  printf("wow negative %d\n", -3742);
-  printf("such hex %x %X\n", 0xcafe, 0xdeadbeef);
-  
-  printf("such pointer %p\n", (void*)0xcafe1234);
-
-  for (int i=0; i<10; i++)
-  {
-    colorputs("hello colorful world!!\n", i);
-  }
-  // Div by zero exception
-  
-  //printf("Lalala, what a beautiful day! %d", 4/0);
+  timer_install();
 
   return retvalue;
 }
diff --git a/makefile b/makefile
index 14f5ca0..db6ae9a 100644
--- a/makefile
+++ b/makefile
@@ -1,4 +1,4 @@
-OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o idt.o system.o isr.o irq.o 
+OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o idt.o system.o isr.o irq.o timer.o 
 CC = gcc
 CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -Wextra -c
 LDFLAGS = -T link.ld -melf_i386
diff --git a/os.iso b/os.iso
index db0f41cd70dc78aaddd7e241683d099308cb896a..347513c96c5e5a91faca7e6de81441a179818505 100644
GIT binary patch
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diff --git a/system.h b/system.h
index 031f160..6104e5b 100644
--- a/system.h
+++ b/system.h
@@ -17,4 +17,7 @@ void isr_install();
 void irq_install();
 void irq_install_handler(int irq, void (*handler)(struct regs *r));
 void irq_uninstall_handler(int irq);
+void timer_install();
+void delay(int ticks);
 #endif
+
diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..ddc308e
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,26 @@
+#include "system.h"
+#include "stdio.h"
+
+int timer_ticks = 0;
+
+void timer_handler()
+{
+	timer_ticks++;
+
+	if(timer_ticks % 18 == 0)
+	{
+		puts("One second has passed\n");
+	}
+}
+
+void timer_install()
+{
+	irq_install_handler(0, timer_handler);
+}
+
+void delay(int ticks)
+{
+	unsigned long eticks;
+	eticks = timer_ticks + ticks;
+	while ((unsigned long)timer_ticks < eticks);
+}