got interrupts working, added sys/{pic,timer,cpu} modules, ready to work on multitasking

git-svn-id: svn://anubis/hos/trunk@69 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/include/hos_defines.h

@@ -18,10 +18,12 @@ extern "C" {
 #define CONSOLE_MEMORY          0xB8000
 
 extern  u8_t    _code;
+extern  u8_t    _data;
 extern  u8_t    _bss;
 extern  u8_t    _end;
 
 #define KERNEL_CODE (&_code)
+#define KERNEL_DATA (&_data)
 #define KERNEL_BSS  (&_bss)
 #define KERNEL_END  (&_end)
 
@@ -31,6 +33,8 @@ extern  u8_t    _end;
 
 #define KERNEL_STACK_TOP        0xF0000000
 
+#define KERNEL_TIMER_FREQ       1000
+
 #ifdef __cplusplus
 }
 #endif

kernel/include/hos_types.h

@@ -42,8 +42,8 @@ typedef struct
 
 typedef struct
 {
-    u16_t   length;
-    u32_t   phys_addr;
+    u16_t   limit;
+    u32_t   base;
 } __attribute__ ((packed)) gdtr_t;
 
 typedef gdtr_t idtr_t;