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[Xen-changelog] [xen-unstable] [IA64] import linux/include/asm-ia64/uacc

To: xen-changelog@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-changelog] [xen-unstable] [IA64] import linux/include/asm-ia64/uaccess.h for /dev/mem paravirtualization
From: Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 09 Dec 2006 15:44:34 +0000
Delivery-date: Sat, 09 Dec 2006 07:46:40 -0800
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# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID bef3a5ffd78d234cfa62641429c4e60ee754ae9d
# Parent  82a58111366979e09cf538881a2d89dccb56bd69
[IA64] import linux/include/asm-ia64/uaccess.h for /dev/mem paravirtualization

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/include/asm-ia64/uaccess.h |  401 ++++++++++++++++++++++++
 1 files changed, 401 insertions(+)

diff -r 82a581113669 -r bef3a5ffd78d 
linux-2.6-xen-sparse/include/asm-ia64/uaccess.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/include/asm-ia64/uaccess.h   Mon Dec 04 08:37:20 
2006 -0700
@@ -0,0 +1,401 @@
+#ifndef _ASM_IA64_UACCESS_H
+#define _ASM_IA64_UACCESS_H
+
+/*
+ * This file defines various macros to transfer memory areas across
+ * the user/kernel boundary.  This needs to be done carefully because
+ * this code is executed in kernel mode and uses user-specified
+ * addresses.  Thus, we need to be careful not to let the user to
+ * trick us into accessing kernel memory that would normally be
+ * inaccessible.  This code is also fairly performance sensitive,
+ * so we want to spend as little time doing safety checks as
+ * possible.
+ *
+ * To make matters a bit more interesting, these macros sometimes also
+ * called from within the kernel itself, in which case the address
+ * validity check must be skipped.  The get_fs() macro tells us what
+ * to do: if get_fs()==USER_DS, checking is performed, if
+ * get_fs()==KERNEL_DS, checking is bypassed.
+ *
+ * Note that even if the memory area specified by the user is in a
+ * valid address range, it is still possible that we'll get a page
+ * fault while accessing it.  This is handled by filling out an
+ * exception handler fixup entry for each instruction that has the
+ * potential to fault.  When such a fault occurs, the page fault
+ * handler checks to see whether the faulting instruction has a fixup
+ * associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and
+ * then resumes execution at the continuation point.
+ *
+ * Based on <asm-alpha/uaccess.h>.
+ *
+ * Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co
+ *     David Mosberger-Tang <davidm@xxxxxxxxxx>
+ */
+
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/page-flags.h>
+#include <linux/mm.h>
+
+#include <asm/intrinsics.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+
+/*
+ * For historical reasons, the following macros are grossly misnamed:
+ */
+#define KERNEL_DS      ((mm_segment_t) { ~0UL })               /* cf. 
access_ok() */
+#define USER_DS                ((mm_segment_t) { TASK_SIZE-1 })        /* cf. 
access_ok() */
+
+#define VERIFY_READ    0
+#define VERIFY_WRITE   1
+
+#define get_ds()  (KERNEL_DS)
+#define get_fs()  (current_thread_info()->addr_limit)
+#define set_fs(x) (current_thread_info()->addr_limit = (x))
+
+#define segment_eq(a, b)       ((a).seg == (b).seg)
+
+/*
+ * When accessing user memory, we need to make sure the entire area really is 
in
+ * user-level space.  In order to do this efficiently, we make sure that the 
page at
+ * address TASK_SIZE is never valid.  We also need to make sure that the 
address doesn't
+ * point inside the virtually mapped linear page table.
+ */
+#define __access_ok(addr, size, segment)                                       
        \
+({                                                                             
        \
+       __chk_user_ptr(addr);                                                   
        \
+       (likely((unsigned long) (addr) <= (segment).seg)                        
        \
+        && ((segment).seg == KERNEL_DS.seg                                     
        \
+            || likely(REGION_OFFSET((unsigned long) (addr)) < 
RGN_MAP_LIMIT)));        \
+})
+#define access_ok(type, addr, size)    __access_ok((addr), (size), get_fs())
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ *
+ * Careful to not
+ * (a) re-use the arguments for side effects (sizeof/typeof is ok)
+ * (b) require any knowledge of processes at this stage
+ */
+#define put_user(x, ptr)       __put_user_check((__typeof__(*(ptr))) (x), 
(ptr), sizeof(*(ptr)), get_fs())
+#define get_user(x, ptr)       __get_user_check((x), (ptr), sizeof(*(ptr)), 
get_fs())
+
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the programmer has to do the
+ * checks by hand with "access_ok()")
+ */
+#define __put_user(x, ptr)     __put_user_nocheck((__typeof__(*(ptr))) (x), 
(ptr), sizeof(*(ptr)))
+#define __get_user(x, ptr)     __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
+
+extern long __put_user_unaligned_unknown (void);
+
+#define __put_user_unaligned(x, ptr)                                           
                \
+({                                                                             
                \
+       long __ret;                                                             
                \
+       switch (sizeof(*(ptr))) {                                               
                \
+               case 1: __ret = __put_user((x), (ptr)); break;                  
                \
+               case 2: __ret = (__put_user((x), (u8 __user *)(ptr)))           
                \
+                       | (__put_user((x) >> 8, ((u8 __user *)(ptr) + 1))); 
break;              \
+               case 4: __ret = (__put_user((x), (u16 __user *)(ptr)))          
                \
+                       | (__put_user((x) >> 16, ((u16 __user *)(ptr) + 1))); 
break;            \
+               case 8: __ret = (__put_user((x), (u32 __user *)(ptr)))          
                \
+                       | (__put_user((x) >> 32, ((u32 __user *)(ptr) + 1))); 
break;            \
+               default: __ret = __put_user_unaligned_unknown();                
                \
+       }                                                                       
                \
+       __ret;                                                                  
                \
+})
+
+extern long __get_user_unaligned_unknown (void);
+
+#define __get_user_unaligned(x, ptr)                                           
                \
+({                                                                             
                \
+       long __ret;                                                             
                \
+       switch (sizeof(*(ptr))) {                                               
                \
+               case 1: __ret = __get_user((x), (ptr)); break;                  
                \
+               case 2: __ret = (__get_user((x), (u8 __user *)(ptr)))           
                \
+                       | (__get_user((x) >> 8, ((u8 __user *)(ptr) + 1))); 
break;              \
+               case 4: __ret = (__get_user((x), (u16 __user *)(ptr)))          
                \
+                       | (__get_user((x) >> 16, ((u16 __user *)(ptr) + 1))); 
break;            \
+               case 8: __ret = (__get_user((x), (u32 __user *)(ptr)))          
                \
+                       | (__get_user((x) >> 32, ((u32 __user *)(ptr) + 1))); 
break;            \
+               default: __ret = __get_user_unaligned_unknown();                
                \
+       }                                                                       
                \
+       __ret;                                                                  
                \
+})
+
+#ifdef ASM_SUPPORTED
+  struct __large_struct { unsigned long buf[100]; };
+# define __m(x) (*(struct __large_struct __user *)(x))
+
+/* We need to declare the __ex_table section before we can use it in .xdata.  
*/
+asm (".section \"__ex_table\", \"a\"\n\t.previous");
+
+# define __get_user_size(val, addr, n, err)                                    
                \
+do {                                                                           
                \
+       register long __gu_r8 asm ("r8") = 0;                                   
                \
+       register long __gu_r9 asm ("r9");                                       
                \
+       asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by 
exception handler\n"     \
+            "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n"                         
                \
+            "[1:]"                                                             
                \
+            : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8));    
                \
+       (err) = __gu_r8;                                                        
                \
+       (val) = __gu_r9;                                                        
                \
+} while (0)
+
+/*
+ * The "__put_user_size()" macro tells gcc it reads from memory instead of 
writing it.  This
+ * is because they do not write to any memory gcc knows about, so there are no 
aliasing
+ * issues.
+ */
+# define __put_user_size(val, addr, n, err)                                    
                \
+do {                                                                           
                \
+       register long __pu_r8 asm ("r8") = 0;                                   
                \
+       asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by 
exception handler\n" \
+                     "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n"                  
                \
+                     "[1:]"                                                    
                \
+                     : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), 
"0"(__pu_r8));               \
+       (err) = __pu_r8;                                                        
                \
+} while (0)
+
+#else /* !ASM_SUPPORTED */
+# define RELOC_TYPE    2       /* ip-rel */
+# define __get_user_size(val, addr, n, err)                            \
+do {                                                                   \
+       __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE);   \
+       (err) = ia64_getreg(_IA64_REG_R8);                              \
+       (val) = ia64_getreg(_IA64_REG_R9);                              \
+} while (0)
+# define __put_user_size(val, addr, n, err)                                    
                \
+do {                                                                           
                \
+       __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned 
long) (val));    \
+       (err) = ia64_getreg(_IA64_REG_R8);                                      
                \
+} while (0)
+#endif /* !ASM_SUPPORTED */
+
+extern void __get_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve 
subroutine-calls, which
+ * could clobber r8 and r9 (among others).  Thus, be careful not to evaluate 
it while
+ * using r8/r9.
+ */
+#define __do_get_user(check, x, ptr, size, segment)                            
        \
+({                                                                             
        \
+       const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);                      
        \
+       __typeof__ (size) __gu_size = (size);                                   
        \
+       long __gu_err = -EFAULT;                                                
        \
+       unsigned long __gu_val = 0;                                             
        \
+       if (!check || __access_ok(__gu_ptr, size, segment))                     
        \
+               switch (__gu_size) {                                            
        \
+                     case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); 
break;  \
+                     case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); 
break;  \
+                     case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); 
break;  \
+                     case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); 
break;  \
+                     default: __get_user_unknown(); break;                     
        \
+               }                                                               
        \
+       (x) = (__typeof__(*(__gu_ptr))) __gu_val;                               
        \
+       __gu_err;                                                               
        \
+})
+
+#define __get_user_nocheck(x, ptr, size)       __do_get_user(0, x, ptr, size, 
KERNEL_DS)
+#define __get_user_check(x, ptr, size, segment)        __do_get_user(1, x, 
ptr, size, segment)
+
+extern void __put_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve 
subroutine-calls, which
+ * could clobber r8 (among others).  Thus, be careful not to evaluate them 
while using r8.
+ */
+#define __do_put_user(check, x, ptr, size, segment)                            
        \
+({                                                                             
        \
+       __typeof__ (x) __pu_x = (x);                                            
        \
+       __typeof__ (*(ptr)) __user *__pu_ptr = (ptr);                           
        \
+       __typeof__ (size) __pu_size = (size);                                   
        \
+       long __pu_err = -EFAULT;                                                
        \
+                                                                               
        \
+       if (!check || __access_ok(__pu_ptr, __pu_size, segment))                
        \
+               switch (__pu_size) {                                            
        \
+                     case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); 
break;    \
+                     case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); 
break;    \
+                     case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); 
break;    \
+                     case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); 
break;    \
+                     default: __put_user_unknown(); break;                     
        \
+               }                                                               
        \
+       __pu_err;                                                               
        \
+})
+
+#define __put_user_nocheck(x, ptr, size)       __do_put_user(0, x, ptr, size, 
KERNEL_DS)
+#define __put_user_check(x, ptr, size, segment)        __do_put_user(1, x, 
ptr, size, segment)
+
+/*
+ * Complex access routines
+ */
+extern unsigned long __must_check __copy_user (void __user *to, const void 
__user *from,
+                                              unsigned long count);
+
+static inline unsigned long
+__copy_to_user (void __user *to, const void *from, unsigned long count)
+{
+       return __copy_user(to, (__force void __user *) from, count);
+}
+
+static inline unsigned long
+__copy_from_user (void *to, const void __user *from, unsigned long count)
+{
+       return __copy_user((__force void __user *) to, from, count);
+}
+
+#define __copy_to_user_inatomic                __copy_to_user
+#define __copy_from_user_inatomic      __copy_from_user
+#define copy_to_user(to, from, n)                                              
        \
+({                                                                             
        \
+       void __user *__cu_to = (to);                                            
        \
+       const void *__cu_from = (from);                                         
        \
+       long __cu_len = (n);                                                    
        \
+                                                                               
        \
+       if (__access_ok(__cu_to, __cu_len, get_fs()))                           
        \
+               __cu_len = __copy_user(__cu_to, (__force void __user *) 
__cu_from, __cu_len);   \
+       __cu_len;                                                               
        \
+})
+
+#define copy_from_user(to, from, n)                                            
        \
+({                                                                             
        \
+       void *__cu_to = (to);                                                   
        \
+       const void __user *__cu_from = (from);                                  
        \
+       long __cu_len = (n);                                                    
        \
+                                                                               
        \
+       __chk_user_ptr(__cu_from);                                              
        \
+       if (__access_ok(__cu_from, __cu_len, get_fs()))                         
        \
+               __cu_len = __copy_user((__force void __user *) __cu_to, 
__cu_from, __cu_len);   \
+       __cu_len;                                                               
        \
+})
+
+#define __copy_in_user(to, from, size) __copy_user((to), (from), (size))
+
+static inline unsigned long
+copy_in_user (void __user *to, const void __user *from, unsigned long n)
+{
+       if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, 
to, n)))
+               n = __copy_user(to, from, n);
+       return n;
+}
+
+extern unsigned long __do_clear_user (void __user *, unsigned long);
+
+#define __clear_user(to, n)            __do_clear_user(to, n)
+
+#define clear_user(to, n)                                      \
+({                                                             \
+       unsigned long __cu_len = (n);                           \
+       if (__access_ok(to, __cu_len, get_fs()))                \
+               __cu_len = __do_clear_user(to, __cu_len);       \
+       __cu_len;                                               \
+})
+
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire buffer 
filled, else
+ * strlen.
+ */
+extern long __must_check __strncpy_from_user (char *to, const char __user 
*from, long to_len);
+
+#define strncpy_from_user(to, from, n)                                 \
+({                                                                     \
+       const char __user * __sfu_from = (from);                        \
+       long __sfu_ret = -EFAULT;                                       \
+       if (__access_ok(__sfu_from, 0, get_fs()))                       \
+               __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
+       __sfu_ret;                                                      \
+})
+
+/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
+extern unsigned long __strlen_user (const char __user *);
+
+#define strlen_user(str)                               \
+({                                                     \
+       const char __user *__su_str = (str);            \
+       unsigned long __su_ret = 0;                     \
+       if (__access_ok(__su_str, 0, get_fs()))         \
+               __su_ret = __strlen_user(__su_str);     \
+       __su_ret;                                       \
+})
+
+/*
+ * Returns: 0 if exception before NUL or reaching the supplied limit
+ * (N), a value greater than N if the limit would be exceeded, else
+ * strlen.
+ */
+extern unsigned long __strnlen_user (const char __user *, long);
+
+#define strnlen_user(str, len)                                 \
+({                                                             \
+       const char __user *__su_str = (str);                    \
+       unsigned long __su_ret = 0;                             \
+       if (__access_ok(__su_str, 0, get_fs()))                 \
+               __su_ret = __strnlen_user(__su_str, len);       \
+       __su_ret;                                               \
+})
+
+/* Generic code can't deal with the location-relative format that we use for 
compactness.  */
+#define ARCH_HAS_SORT_EXTABLE
+#define ARCH_HAS_SEARCH_EXTABLE
+
+struct exception_table_entry {
+       int addr;       /* location-relative address of insn this fixup is for 
*/
+       int cont;       /* location-relative continuation addr.; if bit 2 is 
set, r9 is set to 0 */
+};
+
+extern void ia64_handle_exception (struct pt_regs *regs, const struct 
exception_table_entry *e);
+extern const struct exception_table_entry *search_exception_tables (unsigned 
long addr);
+
+static inline int
+ia64_done_with_exception (struct pt_regs *regs)
+{
+       const struct exception_table_entry *e;
+       e = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri);
+       if (e) {
+               ia64_handle_exception(regs, e);
+               return 1;
+       }
+       return 0;
+}
+
+#define ARCH_HAS_TRANSLATE_MEM_PTR     1
+static __inline__ char *
+xlate_dev_mem_ptr (unsigned long p)
+{
+       struct page *page;
+       char * ptr;
+
+       page = pfn_to_page(p >> PAGE_SHIFT);
+       if (PageUncached(page))
+               ptr = (char *)p + __IA64_UNCACHED_OFFSET;
+       else
+               ptr = __va(p);
+
+       return ptr;
+}
+
+/*
+ * Convert a virtual cached kernel memory pointer to an uncached pointer
+ */
+static __inline__ char *
+xlate_dev_kmem_ptr (char * p)
+{
+       struct page *page;
+       char * ptr;
+
+       page = virt_to_page((unsigned long)p >> PAGE_SHIFT);
+       if (PageUncached(page))
+               ptr = (char *)__pa(p) + __IA64_UNCACHED_OFFSET;
+       else
+               ptr = p;
+
+       return ptr;
+}
+
+#endif /* _ASM_IA64_UACCESS_H */

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