Changeset 573 for libcaca/trunk/kernelTweet

Timestamp:

Mar 9, 2006, 4:35:00 PM (15 years ago)

Author:

Sam Hocevar

Message:

• Added assembly code for inb() and outb().
• Print a small message at kernel boot time just to check that the kernel was properly loaded.

Location:

libcaca/trunk/kernel

Files:

• kernel.c (modified) (1 diff)
• kernel.h (modified) (1 diff)

libcaca/trunk/kernel/kernel.c

@@ -30 +30 @@
 void cmain(unsigned long int magic, unsigned long int addr)
 {
+    static char const text[] = "Booting libcaca kernel...";
+    char const *ptr = text;
+    char *video = (char*)0xB8000;
+
     char *argv[] = { NULL };
     int argc = 0;
+
+    /* Print a text message to say hello */
+    while(*ptr)
+        *video = *ptr++; video += 2;
+
+    /* Launch the main program */
     main(argc, argv);
 }

libcaca/trunk/kernel/kernel.h

@@ -28 +28 @@
 #define __BIG_ENDIAN 2
 
+/* Assembly code for outb and inb */
+extern inline void outb(unsigned char val, unsigned short port);
+extern inline unsigned char inb(unsigned short port);
+
+extern inline void outb(unsigned char val, unsigned short port)
+{
+    __asm__ __volatile__ ("outb %b0,%w1" : : "a" (val), "Nd" (port));
+}
+
+extern inline unsigned char inb(unsigned short port)
+{
+    unsigned char tmp;
+    __asm__ __volatile__ ("inb %w1,%0" : "=a" (tmp) : "Nd" (port));
+    return tmp;
+}
+
 /* Various typedefs -- some are x86-specific */
 #define CUSTOM_INTTYPES
 typedef unsigned char uint8_t;
 typedef unsigned short uint16_t;
-typedef unsigned int uint32_t;
-typedef unsigned int uintptr_t;
+typedef unsigned long int uint32_t;
+typedef long int intptr_t;
+typedef long unsigned int uintptr_t;
 
 typedef unsigned int size_t;