loader.h

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#ifndef THREADS_LOADER_H
#define THREADS_LOADER_H
 
/** Constants fixed by the PC BIOS. */
#define LOADER_BASE 0x7c00      /**< Physical address of loader's base. */
#define LOADER_END  0x7e00      /**< Physical address of end of loader. */
 
/** Physical address of kernel base. */
#define LOADER_KERN_BASE 0x20000       /**< 128 kB. */
 
/** Kernel virtual address at which all physical memory is mapped.
   Must be aligned on a 4 MB boundary. */
#define LOADER_PHYS_BASE 0xc0000000     /**< 3 GB. */
 
/** Important loader physical addresses. */
#define LOADER_SIG (LOADER_END - LOADER_SIG_LEN)   /**< 0xaa55 BIOS signature. */
#define LOADER_PARTS (LOADER_SIG - LOADER_PARTS_LEN)     /**< Partition table. */
#define LOADER_ARGS (LOADER_PARTS - LOADER_ARGS_LEN)   /**< Command-line args. */
#define LOADER_ARG_CNT (LOADER_ARGS - LOADER_ARG_CNT_LEN) /**< Number of args. */
 
/** Sizes of loader data structures. */
#define LOADER_SIG_LEN 2
#define LOADER_PARTS_LEN 64
#define LOADER_ARGS_LEN 128
#define LOADER_ARG_CNT_LEN 4
 
/** GDT selectors defined by loader.
   More selectors are defined by userprog/gdt.h. */
#define SEL_NULL        0x00    /**< Null selector. */
#define SEL_KCSEG       0x08    /**< Kernel code selector. */
#define SEL_KDSEG       0x10    /**< Kernel data selector. */
 
#ifndef __ASSEMBLER__
#include <stdint.h>
 
/** Amount of physical memory, in 4 kB pages. */
extern uint32_t init_ram_pages;
#endif
 
#endif /**< threads/loader.h */