boot.h

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#pragma once
 
#include "multiboot.h"
 
typedef struct boot_info_t {
    unsigned int magic;
 
    /*
     * Bootloader physical range
     * it can be overwritten to do other things
     * */
 
    unsigned int bootloader_phy_start;
    unsigned int bootloader_phy_end;
 
    /*
     * Kernel virtual and physical range
     * must not be overwritten
     * it's assumed to be contiguous, so section holes are just wasted space
     * */
 
    unsigned int kernel_phy_start;
    unsigned int kernel_phy_end;
 
    unsigned int kernel_start;
    unsigned int kernel_end;
 
    unsigned int kernel_size;
 
    unsigned int module_end;
 
    /*
     * Range of addressable lowmemory, is memory that is available
     * (not used by the kernel executable nor by the bootloader)
     * and can be accessed by the kernel at any time
     * */
 
    unsigned int lowmem_phy_start;
    unsigned int lowmem_phy_end;
 
    unsigned int lowmem_start;
    unsigned int lowmem_end;
 
    unsigned int stack_end;
 
    /*
     * Range of non-addressable highmemory, is memory that can be
     * accessed by the kernel only if previously mapped
     * */
 
    unsigned int highmem_phy_start;
    unsigned int highmem_phy_end;
 
    multiboot_info_t *multiboot_header;
 
    unsigned int stack_base;
} boot_info_t;