Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #ifndef _ASM_IA64_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #define _ASM_IA64_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * This file defines various macros to transfer memory areas across
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * the user/kernel boundary.  This needs to be done carefully because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * this code is executed in kernel mode and uses user-specified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * addresses.  Thus, we need to be careful not to let the user to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * trick us into accessing kernel memory that would normally be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * inaccessible.  This code is also fairly performance sensitive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * so we want to spend as little time doing safety checks as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * To make matters a bit more interesting, these macros sometimes also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * called from within the kernel itself, in which case the address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * validity check must be skipped.  The get_fs() macro tells us what
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * to do: if get_fs()==USER_DS, checking is performed, if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * get_fs()==KERNEL_DS, checking is bypassed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * Note that even if the memory area specified by the user is in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * valid address range, it is still possible that we'll get a page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * fault while accessing it.  This is handled by filling out an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * exception handler fixup entry for each instruction that has the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * potential to fault.  When such a fault occurs, the page fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * handler checks to see whether the faulting instruction has a fixup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * then resumes execution at the continuation point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * Based on <asm-alpha/uaccess.h>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *	David Mosberger-Tang <davidm@hpl.hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/page-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <asm/intrinsics.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include <asm/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * For historical reasons, the following macros are grossly misnamed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define KERNEL_DS	((mm_segment_t) { ~0UL })		/* cf. access_ok() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define USER_DS		((mm_segment_t) { TASK_SIZE-1 })	/* cf. access_ok() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define get_fs()  (current_thread_info()->addr_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define set_fs(x) (current_thread_info()->addr_limit = (x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * When accessing user memory, we need to make sure the entire area really is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * user-level space.  In order to do this efficiently, we make sure that the page at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * address TASK_SIZE is never valid.  We also need to make sure that the address doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * point inside the virtually mapped linear page table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static inline int __access_ok(const void __user *p, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	unsigned long addr = (unsigned long)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	unsigned long seg = get_fs().seg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return likely(addr <= seg) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	 (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #define access_ok(addr, size)	__access_ok((addr), (size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  * These are the main single-value transfer routines.  They automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * use the right size if we just have the right pointer type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * Careful to not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * (a) re-use the arguments for side effects (sizeof/typeof is ok)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * (b) require any knowledge of processes at this stage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) #define put_user(x, ptr)	__put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) #define get_user(x, ptr)	__get_user_check((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * The "__xxx" versions do not do address space checking, useful when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * doing multiple accesses to the same area (the programmer has to do the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * checks by hand with "access_ok()")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #define __put_user(x, ptr)	__put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #define __get_user(x, ptr)	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #ifdef ASM_SUPPORTED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)   struct __large_struct { unsigned long buf[100]; };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) # define __m(x) (*(struct __large_struct __user *)(x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /* We need to declare the __ex_table section before we can use it in .xdata.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) asm (".section \"__ex_table\", \"a\"\n\t.previous");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) # define __get_user_size(val, addr, n, err)							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) do {												\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	register long __gu_r8 asm ("r8") = 0;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	register long __gu_r9 asm ("r9");							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	     "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n"						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	     "[1:]"										\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	     : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8));			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	(err) = __gu_r8;									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	(val) = __gu_r9;									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  * The "__put_user_size()" macro tells gcc it reads from memory instead of writing it.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  * is because they do not write to any memory gcc knows about, so there are no aliasing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  * issues.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) # define __put_user_size(val, addr, n, err)							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) do {												\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	register long __pu_r8 asm ("r8") = 0;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		      "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n"					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		      "[1:]"									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		      : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8));		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	(err) = __pu_r8;									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #else /* !ASM_SUPPORTED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) # define RELOC_TYPE	2	/* ip-rel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) # define __get_user_size(val, addr, n, err)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) do {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	__ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	(err) = ia64_getreg(_IA64_REG_R8);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	(val) = ia64_getreg(_IA64_REG_R9);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) # define __put_user_size(val, addr, n, err)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) do {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	__st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE,	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		  (__force unsigned long) (val));			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	(err) = ia64_getreg(_IA64_REG_R8);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #endif /* !ASM_SUPPORTED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) extern void __get_user_unknown (void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * could clobber r8 and r9 (among others).  Thus, be careful not to evaluate it while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * using r8/r9.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #define __do_get_user(check, x, ptr, size)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ({											\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	__typeof__ (size) __gu_size = (size);						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	long __gu_err = -EFAULT;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	unsigned long __gu_val = 0;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (!check || __access_ok(__gu_ptr, size))					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		switch (__gu_size) {							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		      case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		      case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		      case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		      case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		      default: __get_user_unknown(); break;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		}									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	(x) = (__force __typeof__(*(__gu_ptr))) __gu_val;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	__gu_err;									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #define __get_user_nocheck(x, ptr, size)	__do_get_user(0, x, ptr, size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #define __get_user_check(x, ptr, size)	__do_get_user(1, x, ptr, size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) extern void __put_user_unknown (void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)  * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)  * could clobber r8 (among others).  Thus, be careful not to evaluate them while using r8.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #define __do_put_user(check, x, ptr, size)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ({											\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	__typeof__ (x) __pu_x = (x);							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	__typeof__ (*(ptr)) __user *__pu_ptr = (ptr);					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	__typeof__ (size) __pu_size = (size);						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	long __pu_err = -EFAULT;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 											\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (!check || __access_ok(__pu_ptr, __pu_size))					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		switch (__pu_size) {							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		      case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		      case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		      case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		      case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		      default: __put_user_unknown(); break;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		}									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	__pu_err;									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #define __put_user_nocheck(x, ptr, size)	__do_put_user(0, x, ptr, size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #define __put_user_check(x, ptr, size)	__do_put_user(1, x, ptr, size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * Complex access routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 					       unsigned long count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) raw_copy_to_user(void __user *to, const void *from, unsigned long count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return __copy_user(to, (__force void __user *) from, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) raw_copy_from_user(void *to, const void __user *from, unsigned long count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return __copy_user((__force void __user *) to, from, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) #define INLINE_COPY_FROM_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #define INLINE_COPY_TO_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) extern unsigned long __do_clear_user (void __user *, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #define __clear_user(to, n)		__do_clear_user(to, n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) #define clear_user(to, n)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ({								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	unsigned long __cu_len = (n);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (__access_ok(to, __cu_len))				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		__cu_len = __do_clear_user(to, __cu_len);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	__cu_len;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * strlen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) #define strncpy_from_user(to, from, n)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ({									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	const char __user * __sfu_from = (from);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	long __sfu_ret = -EFAULT;					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (__access_ok(__sfu_from, 0))					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		__sfu_ret = __strncpy_from_user((to), __sfu_from, (n));	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	__sfu_ret;							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * Returns: 0 if exception before NUL or reaching the supplied limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * (N), a value greater than N if the limit would be exceeded, else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  * strlen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) extern unsigned long __strnlen_user (const char __user *, long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) #define strnlen_user(str, len)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) ({								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	const char __user *__su_str = (str);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	unsigned long __su_ret = 0;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (__access_ok(__su_str, 0))				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		__su_ret = __strnlen_user(__su_str, len);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	__su_ret;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) #define ARCH_HAS_TRANSLATE_MEM_PTR	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static __inline__ void *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) xlate_dev_mem_ptr(phys_addr_t p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	void *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	page = pfn_to_page(p >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (PageUncached(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		ptr = (void *)p + __IA64_UNCACHED_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		ptr = __va(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * Convert a virtual cached kernel memory pointer to an uncached pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static __inline__ void *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) xlate_dev_kmem_ptr(void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	void *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	page = virt_to_page((unsigned long)p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (PageUncached(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		ptr = (void *)__pa(p) + __IA64_UNCACHED_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		ptr = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #endif /* _ASM_IA64_UACCESS_H */