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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [IA64] import linux/include/asm-ia64/uaccess.h for /dev/mem paravirtualization
# 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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