• Huang Ying's avatar
    x86: kexec: Use one page table in x86_64 machine_kexec · f5deb796
    Huang Ying authored
    Impact: reduce kernel BSS size by 7 pages, improve code readability
    Two page tables are used in current x86_64 kexec implementation. One
    is used to jump from kernel virtual address to identity map address,
    the other is used to map all physical memory. In fact, on x86_64,
    there is no conflict between kernel virtual address space and physical
    memory space, so just one page table is sufficient. The page table
    pages used to map control page are dynamically allocated to save
    memory if kexec image is not loaded. ASM code used to map control page
    is replaced by C code too.
    Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
machine_kexec_64.c 6.3 KB