#format wiki #language en == Cyrill Gorcunov == Email: [[MailTo(gorcunov AT SPAMFREE gmail DOT com)]] === Interesting links === * Virtual Memory: Issues Of Implementation http://www.eng.umd.edu/~blj/papers/computer31-6.pdf * Memory Subsystem (lecture) http://www.ece.gatech.edu/academic/courses/summer2007/ece3055/Lectures/VirtualMemory/VirtualMemory-lee.pdf === My notes on Linux kernel internals === ==== x86-32 memory initialization ==== Paging is initialized in arch/x86/mm/init_32.c. The function 'paging_init()' is called once by setup_arch during kernel initialization. It immediately calls pagetable_init(). pagetable_init() starts by defining the base of the page table directory: {{{ *pgd_base = swapper_pg_dir; }}} swapper_pg_dir is defined in head_32.S as {{{ .section ".bss.page_aligned","wa" .align PAGE_SIZE_asm ENTRY(swapper_pg_dir) .fill 1024,4,0 }}} that creates an array of 1024 entries each of 4 bytes length (Page Directory entries in terms of Intel manual). A such definition allows ld program to place swapper_pg_dir at special predefined memory address while linking a kernel. It points to 0x1000 above the 'root' of kernel memory. Kernel memory is defined to start at PAGE_OFFSET, which is 0XC0000000 for x86, or 3 gigabytes. (This is where the 3G/1G split is defined.) Every virtual address above PAGE_OFFSET is the kernel, any address below PAGE_OFFSET is a user space. Further is available on http://linux-mm.org/VirtualMemory ==== x86-32 memory initialization (SMP) ==== To be continued... Probably ;) ---- . CategoryHomepage