e72e9355e3
git: https://android.googlesource.com/kernel/common branch: android-4.9 commit: 03fcc2fe71308c2d164b4e6cbfc738c63e670444
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#ifndef _LINUX_KAISER_H
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#define _LINUX_KAISER_H
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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#include <asm/kaiser.h>
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static inline int kaiser_map_thread_stack(void *stack)
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{
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/*
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* Map that page of kernel stack on which we enter from user context.
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*/
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return kaiser_add_mapping((unsigned long)stack +
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THREAD_SIZE - PAGE_SIZE, PAGE_SIZE, __PAGE_KERNEL);
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}
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static inline void kaiser_unmap_thread_stack(void *stack)
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{
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/*
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* Note: may be called even when kaiser_map_thread_stack() failed.
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*/
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kaiser_remove_mapping((unsigned long)stack +
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THREAD_SIZE - PAGE_SIZE, PAGE_SIZE);
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}
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#else
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/*
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* These stubs are used whenever CONFIG_PAGE_TABLE_ISOLATION is off, which
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* includes architectures that support KAISER, but have it disabled.
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*/
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static inline void kaiser_init(void)
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{
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}
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static inline int kaiser_add_mapping(unsigned long addr,
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unsigned long size, u64 flags)
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{
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return 0;
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}
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static inline void kaiser_remove_mapping(unsigned long start,
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unsigned long size)
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{
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}
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static inline int kaiser_map_thread_stack(void *stack)
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{
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return 0;
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}
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static inline void kaiser_unmap_thread_stack(void *stack)
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{
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}
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#endif /* !CONFIG_PAGE_TABLE_ISOLATION */
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#endif /* _LINUX_KAISER_H */
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