From c8a195e1eb19d346c03c1dfa6ed66c6215caefa2 Mon Sep 17 00:00:00 2001
From: Franklin Wei <frankhwei536@gmail.com>
Date: Mon, 2 Feb 2015 21:48:38 -0500
Subject: Refactor, begin writing a PS/2 driver

---
 kernel/include/isr.h   | 11 +++++++----
 kernel/include/panic.h |  1 +
 kernel/include/timer.h |  7 +++++++
 kernel/irq.c           |  4 ++++
 kernel/isr.c           |  2 +-
 kernel/main.c          | 26 ++++++++++++++++++--------
 kernel/timer.c         | 17 +++++++++++++++++
 7 files changed, 55 insertions(+), 13 deletions(-)
 create mode 100644 kernel/include/panic.h
 create mode 100644 kernel/include/timer.h
 create mode 100644 kernel/timer.c

(limited to 'kernel')

diff --git a/kernel/include/isr.h b/kernel/include/isr.h
index 5d6d282..de81cd2 100644
--- a/kernel/include/isr.h
+++ b/kernel/include/isr.h
@@ -34,15 +34,18 @@ extern void _isr29(void);
 extern void _isr30(void);
 extern void _isr31(void);
 
-/* installs all the ISR's */
+/* installs ISR's 0-31 */
 void isr_init(void);
 
 /* This defines what the stack looks like after an ISR was running */
 struct regs_t {
-    uint32_t gs, fs, es, ds;      /* pushed the segs last */
+    uint32_t gs, fs, es, ds; /* pushed the segs last */
     uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;  /* pushed by 'pusha' */
-    uint32_t int_no, err_code;    /* our 'push byte #' and ecodes do this */
+    uint32_t err_code; /* exceptions push this */
+    uint32_t int_no; /* interrupt stubs do this */
     uint32_t eip, cs, eflags, useresp, ss;   /* pushed by the processor automatically */
-};
+} __attribute__((packed));
+
+#define IRQ(x) (32+x)
 
 void set_interrupt_handler(uint8_t interrupt, void (*func)(struct regs_t));
diff --git a/kernel/include/panic.h b/kernel/include/panic.h
new file mode 100644
index 0000000..db53e8e
--- /dev/null
+++ b/kernel/include/panic.h
@@ -0,0 +1 @@
+void panic(const char*, ...);
diff --git a/kernel/include/timer.h b/kernel/include/timer.h
new file mode 100644
index 0000000..a7459a6
--- /dev/null
+++ b/kernel/include/timer.h
@@ -0,0 +1,7 @@
+#include <stdint.h>
+
+extern const uint64_t *current_tick;
+
+struct regs_t;
+
+void timer_init(void);
diff --git a/kernel/irq.c b/kernel/irq.c
index 5d48c46..d98ecda 100644
--- a/kernel/irq.c
+++ b/kernel/irq.c
@@ -55,6 +55,10 @@ void irq_handler(struct regs_t regs)
     {
         handler(regs);
     }
+    else
+    {
+        printf("WARNING: Unhandled IRQ: 0x%x!\n", regs.int_no);
+    }
 
     /* If the IDT entry that was invoked was greater than 40
      *  (meaning IRQ8 - 15), then we need to send an EOI to
diff --git a/kernel/isr.c b/kernel/isr.c
index a4627d0..cb59603 100644
--- a/kernel/isr.c
+++ b/kernel/isr.c
@@ -19,7 +19,7 @@ void isr_handler(struct regs_t regs)
     }
     else
     {
-        printf("WARNING: unhandled ISR");
+        printf("WARNING: unhandled ISR!\n");
     }
 }
 
diff --git a/kernel/main.c b/kernel/main.c
index 63ba635..119cf15 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -1,30 +1,40 @@
+#include <stdio.h>
 #include "gdt.h"
 #include "idt.h"
 #include "isr.h"
 #include "irq.h"
+#include "ps2.h"
+#include "timer.h"
 #include "tty.h"
-#include <stdio.h>
-
-void interrupt(struct regs_t regs)
-{
-}
 
 void main(struct multiboot_header *hdr, uint32_t magic)
 {
+    /* init the terminal first so we can get some output */
     tty_init();
 
+    /* then the descriptor tables so we can do more useful stuff */
     gdt_init();
     idt_init();
 
+    /* install all the interrupt stubs */
     isr_init();
     irq_init();
 
-    for(int i=0;i<256;++i)
-        set_interrupt_handler(i, interrupt);
+    /* initialize other drivers */
+    timer_init();
+    ps2_init();
 
     asm("sti");
 
-    printf("Boot finished.!\n");
+    for(;;)
+    {
+        ps2_set_leds(0x01);
+        ps2_set_leds(0x02);
+        ps2_set_leds(0x04);
+        ps2_set_leds(0x02);
+    }
+
+    printf("Boot finished.\n");
     while(1)
         ;
 }
diff --git a/kernel/timer.c b/kernel/timer.c
new file mode 100644
index 0000000..4b700d7
--- /dev/null
+++ b/kernel/timer.c
@@ -0,0 +1,17 @@
+#include <stdint.h>
+#include "isr.h"
+#include "timer.h"
+
+uint64_t current_tick_data = 0;
+
+const uint64_t *current_tick = &current_tick_data;
+
+static void timer_callback(struct regs_t regs)
+{
+    ++current_tick_data;
+}
+
+void timer_init(void)
+{
+    set_interrupt_handler(IRQ(0), timer_callback);
+}
-- 
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