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authorHuang Ying <ying.huang@intel.com>2009-02-03 14:22:48 +0800
committerH. Peter Anvin <hpa@zytor.com>2009-02-03 18:29:18 -0800
commitf5deb79679af6eb41b61112fadcda28b2a4cfb0d (patch)
tree5de5beef9b17d72e99a9691f8bbd4459c9228e45 /drivers/firmware
parentc415b3dce30dfb41234e118662e8720f47343a4f (diff)
x86: kexec: Use one page table in x86_64 machine_kexec
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: Huang Ying <ying.huang@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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