source: mainline/arch/amd64/_link.ld.in@ 5f85c91

/** AMD64 linker script
 *  
 * umapped section:
 *      kernel text
 *      kernel data
 * mapped section:
 *      kernel text
 *      kernel data 
 */

#define __ASM__
#include <arch/boot/boot.h>
#include <arch/mm/page.h>

OUTPUT_FORMAT(BFD)
ENTRY(kernel_image_start)

SECTIONS {
        .unmapped BOOTSTRAP_OFFSET: AT (BOOTSTRAP_OFFSET) {
                unmapped_ktext_start = .;
                *(K_TEXT_START);
                *(K_TEXT_START_2);
                unmapped_ktext_end = .;

                unmapped_kdata_start = .;
                *(K_DATA_START);
                unmapped_kdata_end = .;
        }

        .mapped (PA2KA(BOOT_OFFSET+BOOTSTRAP_OFFSET)+SIZEOF(.unmapped)) : AT (BOOTSTRAP_OFFSET+SIZEOF(.unmapped)) {
                ktext_start = .;
                *(BOOT_DATA);
                *(.text);
                ktext_end = .;

                kdata_start = .;
                *(.data);               /* initialized data */
                *(.rodata*);            /* string literals */
                hardcoded_load_address = .;
                QUAD(PA2KA(BOOT_OFFSET+BOOTSTRAP_OFFSET));
                hardcoded_ktext_size = .;
                QUAD(ktext_end - ktext_start + (unmapped_ktext_end - unmapped_ktext_start));
                hardcoded_kdata_size = .;
                QUAD(kdata_end - kdata_start + (unmapped_kdata_end - unmapped_kdata_start));
                hardcoded_unmapped_ktext_size = .;
                LONG(unmapped_ktext_end - unmapped_ktext_start);
                hardcoded_unmapped_kdata_size = .;
                LONG(unmapped_kdata_end - unmapped_kdata_start);
                *(COMMON);              /* global variables */

                *(.eh_frame);
                *(.bss);                /* uninitialized static variables */

                symbol_table = .;
                *(symtab.*);            /* Symbol table, must be LAST symbol!*/

                kdata_end = .;
        }

        _hardcoded_kernel_size = (ktext_end - ktext_start) + (unmapped_ktext_end - unmapped_ktext_start) + (kdata_end - kdata_start) + (unmapped_kdata_end - unmapped_kdata_start);

        /* Symbols that need to be accessed both from real mode & long mode */
        /* e820*_boot is real mode (pre-above-1MB-move), e820* is */
        /* kernel mapped above-1MB-physical copied symbol */
        e820table_boot = KA2PA(e820table) - BOOT_OFFSET;
        e820counter_boot = KA2PA(e820counter) - BOOT_OFFSET;

        /* real_bootstrap_gdtr is mapped real_bootstrap_gdtr_boot */
        /* It is physically outside of kernel area, we have to access */
        /* it after modification from long mode for booting */
        /* SMP slave processors */
        real_bootstrap_gdtr = PA2KA(real_bootstrap_gdtr_boot);
}