From 0a41dae5f406d498b5c9ab1542cb5660e0d982f6 Mon Sep 17 00:00:00 2001
From: Scott Gasch <scott.gasch@gmail.com>
Date: Wed, 1 Jun 2016 19:37:09 -0700
Subject: Initial checkin of toy OS project.

---
 kernel/init/main.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 kernel/init/main.c

(limited to 'kernel/init/main.c')

diff --git a/kernel/init/main.c b/kernel/init/main.c
new file mode 100644
index 0000000..22fd14a
--- /dev/null
+++ b/kernel/init/main.c
@@ -0,0 +1,67 @@
+//+----------------------------------------------------------------------------
+//
+// File:     main.c
+//
+// Module:   
+//
+// Synopsis: 
+//
+// Created:  sgasch  4 Jul 2003
+//
+//+----------------------------------------------------------------------------
+
+#include "kernel.h"
+#include "hal.h"
+#include "rtl.h"
+
+extern char __bss_start;
+extern char end;
+
+void
+ZeroBSS(void)
+{
+    BYTE *pBssStart, *pBssEnd;
+
+    pBssStart = &__bss_start;
+    pBssEnd = &end;
+
+    // Fill .bss section with zero
+    RtlSetMemory((void *)pBssStart, '\0', (pBssEnd - pBssStart));
+}
+
+void
+_assert(CHAR *szFunction, CHAR *szFile, ULONG uLine)
+{
+    HalVideoSetCursorPosition(0, 0);
+    HalVideoPrint("ASSERTION in %s at %s line %u.\n",
+               szFunction, szFile, uLine);
+    while(1)
+    {
+        ;
+    }
+}
+
+//
+// Entry point of the kernel.  Not called main because I don't care to 
+// listen to gcc's warnings about argc and argv anymore.
+//
+int
+KernelEntry(BIOS_HARDWARE_BLOCK *phw)
+{
+    ZeroBSS();
+
+    HalVideoInitialize(phw);
+    HalInitializeInterrupts();
+
+    HalVideoPrint("Interrupts initialized.\n");
+    
+ hang:
+    HalReadTimestampCounter();
+    HalVideoPrint("Timestamp Counter: %u%u\n", 
+                  ((g_ullTimeStampCounter >> 32) & 0xffffffff),
+                  (g_ullTimeStampCounter & 0xffffffff));
+    goto hang;
+
+    return(-1);
+}
+
-- 
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