uaccess.h

xen虚拟机源代码安装包

#ifndef __X86_64_UACCESS_H
#define __X86_64_UACCESS_H

#define COMPAT_ARG_XLAT_VIRT_BASE this_cpu(compat_arg_xlat)
#define COMPAT_ARG_XLAT_SIZE      PAGE_SIZE
DECLARE_PER_CPU(char, compat_arg_xlat[COMPAT_ARG_XLAT_SIZE]);
#define is_compat_arg_xlat_range(addr, size) ({                               \
    unsigned long __off;                                                      \
    __off = (unsigned long)(addr) - (unsigned long)COMPAT_ARG_XLAT_VIRT_BASE; \
    (__off <= COMPAT_ARG_XLAT_SIZE) &&                                        \
    ((__off + (unsigned long)(size)) <= COMPAT_ARG_XLAT_SIZE);                \
})

/*
 * Valid if in +ve half of 48-bit address space, or above Xen-reserved area.
 * This is also valid for range checks (addr, addr+size). As long as the
 * start address is outside the Xen-reserved area then we will access a
 * non-canonical address (and thus fault) before ever reaching VIRT_START.
 */
#define __addr_ok(addr) \
    (((unsigned long)(addr) < (1UL<<48)) || \
     ((unsigned long)(addr) >= HYPERVISOR_VIRT_END))

#define access_ok(addr, size) \
    (__addr_ok(addr) || is_compat_arg_xlat_range(addr, size))

#define array_access_ok(addr, count, size) \
    (access_ok(addr, (count)*(size)))

#define __compat_addr_ok(addr) \
    ((unsigned long)(addr) < HYPERVISOR_COMPAT_VIRT_START(current->domain))

#define compat_access_ok(addr, size) \
    __compat_addr_ok((unsigned long)(addr) + ((size) ? (size) - 1 : 0))

#define compat_array_access_ok(addr,count,size) \
    (likely((count) < (~0U / (size))) && \
     compat_access_ok(addr, (count) * (size)))

#define __put_user_size(x,ptr,size,retval,errret)			\
do {									\
	retval = 0;							\
	switch (size) {							\
	case 1: __put_user_asm(x,ptr,retval,"b","b","iq",errret);break;	\
	case 2: __put_user_asm(x,ptr,retval,"w","w","ir",errret);break; \
	case 4: __put_user_asm(x,ptr,retval,"l","k","ir",errret);break;	\
	case 8: __put_user_asm(x,ptr,retval,"q","","ir",errret);break;	\
	default: __put_user_bad();					\
	}								\
} while (0)

#define __get_user_size(x,ptr,size,retval,errret)			\
do {									\
	retval = 0;							\
	switch (size) {							\
	case 1: __get_user_asm(x,ptr,retval,"b","b","=q",errret);break;	\
	case 2: __get_user_asm(x,ptr,retval,"w","w","=r",errret);break;	\
	case 4: __get_user_asm(x,ptr,retval,"l","k","=r",errret);break;	\
	case 8: __get_user_asm(x,ptr,retval,"q","","=r",errret); break;	\
	default: __get_user_bad();					\
	}								\
} while (0)

#endif /* __X86_64_UACCESS_H */