20357559c1
The kernel resides in the higher half, and as of now still identity maps the lower half for compatibility. Will not merge back to master until all the previous features work properly in virtual memory..
58 lines
1.5 KiB
Text
58 lines
1.5 KiB
Text
/*We have to write out this linker script so the linker knows where to put all the soup of stuff we put in start.s and main.c. i'll write out reasoning as i go. */
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/*letting em know our entry point is actually label "start" in start.s, and not some function in the c file.*/
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ENTRY(start)
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SECTIONS
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{
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/*start me at 1Mb because below that is x86 essential stuff, which we dont want to be written on top of.*/
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. = 1M;
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/* we're going to maintain 4K alignment - apparently useful for paging, and i'm not complaining about the lost space anyway. */
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/*our multiboot header from start.s - has to go at the beginning of the executable so the bootloader knows we're loadable.*/
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/*executable section*/
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.mb_sect :
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{
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*(.multiboot)
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}
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.lower_text :
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{
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*(.lower_text)
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}
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/* Higher half addressing! We'll have to also specify that we want to be physically placed at 1MB.*/
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. += 0xC0000000;
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_kernel_start = .;
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.text ALIGN (4K) : AT (ADDR (.text) - 0xC0000000)
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{
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*(.text)
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}
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/*general read only data*/
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.rodata ALIGN (4K) : AT(ADDR(.rodata) - 0xC0000000)
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{
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*(.rodata*)
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*(.gdt_sect)
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*(.idtr)
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}
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/*initialized rw data. */
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.data ALIGN (4K) : AT(ADDR(.data) - 0xC0000000)
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{
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*(.data)
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}
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/*uninitialized data, and our stack as defined in start.s*/
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.bss ALIGN(4K) : AT(ADDR(.bss) - 0xC0000000)
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{
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*(COMMON)
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*(.bss)
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*(.bootstrap_tables)
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*(.tss)
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*(.idt)
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}
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_kernel_end = .;
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}
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