1.1 --- a/src/segm.c	Wed Feb 16 07:26:03 2011 +0200
     1.2 +++ b/src/segm.c	Wed Feb 16 07:50:25 2011 +0200
     1.3 @@ -1,6 +1,7 @@
     1.4  #include <string.h>
     1.5  #include "segm.h"
     1.6  
     1.7 +/* bits for the 3rd 16bt part of the descriptor */
     1.8  #define BIT_ACCESSED	(1 << 8)
     1.9  #define BIT_WR			(1 << 9)
    1.10  #define BIT_RD			(1 << 9)
    1.11 @@ -10,6 +11,7 @@
    1.12  #define BIT_NOSYS		(1 << 12)
    1.13  #define BIT_PRESENT		(1 << 15)
    1.14  
    1.15 +/* bits for the last 16bit part of the descriptor */
    1.16  #define BIT_BIG			(1 << 6)
    1.17  #define BIT_DEFAULT		(1 << 6)
    1.18  #define BIT_GRAN		(1 << 7)
    1.19 @@ -18,7 +20,12 @@
    1.20  
    1.21  static void segm_desc(desc_t *desc, uint32_t base, uint32_t limit, int dpl, int type);
    1.22  
    1.23 +/* these functions are implemented in segm-asm.S */
    1.24 +void setup_selectors(uint16_t code, uint16_t data);
    1.25 +void set_gdt(uint32_t addr, uint16_t limit);
    1.26  
    1.27 +
    1.28 +/* our global descriptor table */
    1.29  static desc_t gdt[4];
    1.30  
    1.31  
    1.32 @@ -33,6 +40,7 @@
    1.33  	setup_selectors(selector(SEGM_KCODE, 0), selector(SEGM_KDATA, 0));
    1.34  }
    1.35  
    1.36 +/* constructs a GDT selector based on index and priviledge level */
    1.37  uint16_t selector(int idx, int rpl)
    1.38  {
    1.39  	return (idx << 3) | (rpl & 3);