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