a021506107
Moves the relocation handling into C, after decompression. This requires that the decompressed size is passed to the decompression routine as well so that relocations can be found. Only kernels that need relocation support will use the code (currently just x86_32), but this is laying the ground work for 64-bit using it in support of KASLR. Based on work by Neill Clift and Michael Davidson. Signed-off-by: Kees Cook <keescook@chromium.org> Link: http://lkml.kernel.org/r/20130708161517.GA4832@www.outflux.net Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#ifndef _ASM_X86_PAGE_32_DEFS_H
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#define _ASM_X86_PAGE_32_DEFS_H
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#include <linux/const.h>
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/*
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* This handles the memory map.
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*
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* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 950MB.
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*
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* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
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* and CONFIG_HIGHMEM64G options in the kernel configuration.
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*/
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#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
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#define __START_KERNEL_map __PAGE_OFFSET
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define STACKFAULT_STACK 0
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#define DOUBLEFAULT_STACK 1
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#define NMI_STACK 0
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#define DEBUG_STACK 0
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#define MCE_STACK 0
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#define N_EXCEPTION_STACKS 1
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#ifdef CONFIG_X86_PAE
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/* 44=32+12, the limit we can fit into an unsigned long pfn */
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#define __PHYSICAL_MASK_SHIFT 44
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#define __VIRTUAL_MASK_SHIFT 32
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#else /* !CONFIG_X86_PAE */
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#define __PHYSICAL_MASK_SHIFT 32
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#define __VIRTUAL_MASK_SHIFT 32
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#endif /* CONFIG_X86_PAE */
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/*
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* Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
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*/
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#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
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#ifndef __ASSEMBLY__
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/*
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* This much address space is reserved for vmalloc() and iomap()
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* as well as fixmap mappings.
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*/
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extern unsigned int __VMALLOC_RESERVE;
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extern int sysctl_legacy_va_layout;
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extern void find_low_pfn_range(void);
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extern void setup_bootmem_allocator(void);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_PAGE_32_DEFS_H */
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