[PATCH] avr32 architecture

This adds support for the Atmel AVR32 architecture as well as the AT32AP7000
CPU and the AT32STK1000 development board.

AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for
cost-sensitive embedded applications, with particular emphasis on low power
consumption and high code density.  The AVR32 architecture is not binary
compatible with earlier 8-bit AVR architectures.

The AVR32 architecture, including the instruction set, is described by the
AVR32 Architecture Manual, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf

The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture.  It
features a 7-stage pipeline, 16KB instruction and data caches and a full
Memory Management Unit.  It also comes with a large set of integrated
peripherals, many of which are shared with the AT91 ARM-based controllers from
Atmel.

Full data sheet is available from

http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf

while the CPU core implementation including caches and MMU is documented by
the AVR32 AP Technical Reference, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf

Information about the AT32STK1000 development board can be found at

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918

including a BSP CD image with an earlier version of this patch, development
tools (binaries and source/patches) and a root filesystem image suitable for
booting from SD card.

Alternatively, there's a preliminary "getting started" guide available at
http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links
to the sources and patches you will need in order to set up a cross-compiling
environment for avr32-linux.

This patch, as well as the other patches included with the BSP and the
toolchain patches, is actively supported by Atmel Corporation.

[dmccr@us.ibm.com: Fix more pxx_page macro locations]
[bunk@stusta.de: fix `make defconfig']
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 335 insertions, 0 deletions

diff --git a/include/asm-avr32/uaccess.h b/include/asm-avr32/uaccess.h
new file mode 100644
index 000000000000..821deb5a9d28
--- /dev/null
+++ b/include/asm-avr32/uaccess.h
@@ -0,0 +1,335 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_UACCESS_H
+#define __ASM_AVR32_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+
+#define VERIFY_READ     0
+#define VERIFY_WRITE    1
+
+typedef struct {
+        unsigned int is_user_space;
+} mm_segment_t;
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not.  If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons (Data Segment Register?), these macros are misnamed.
+ */
+#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
+#define segment_eq(a,b) ((a).is_user_space == (b).is_user_space)
+
+#define USER_ADDR_LIMIT 0x80000000
+
+#define KERNEL_DS       MAKE_MM_SEG(0)
+#define USER_DS         MAKE_MM_SEG(1)
+
+#define get_ds()        (KERNEL_DS)
+
+static inline mm_segment_t get_fs(void)
+{
+        return MAKE_MM_SEG(test_thread_flag(TIF_USERSPACE));
+}
+
+static inline void set_fs(mm_segment_t s)
+{
+        if (s.is_user_space)
+                set_thread_flag(TIF_USERSPACE);
+        else
+                clear_thread_flag(TIF_USERSPACE);
+}
+
+/*
+ * Test whether a block of memory is a valid user space address.
+ * Returns 0 if the range is valid, nonzero otherwise.
+ *
+ * We do the following checks:
+ *   1. Is the access from kernel space?
+ *   2. Does (addr + size) set the carry bit?
+ *   3. Is (addr + size) a negative number (i.e. >= 0x80000000)?
+ *
+ * If yes on the first check, access is granted.
+ * If no on any of the others, access is denied.
+ */
+#define __range_ok(addr, size)                                          \
+        (test_thread_flag(TIF_USERSPACE)                                \
+         && (((unsigned long)(addr) >= 0x80000000)                      \
+             || ((unsigned long)(size) > 0x80000000)                    \
+             || (((unsigned long)(addr) + (unsigned long)(size)) > 0x80000000)))
+
+#define access_ok(type, addr, size) (likely(__range_ok(addr, size) == 0))
+
+static inline int
+verify_area(int type, const void __user *addr, unsigned long size)
+{
+        return access_ok(type, addr, size) ? 0 : -EFAULT;
+}
+
+/* Generic arbitrary sized copy. Return the number of bytes NOT copied */
+extern __kernel_size_t __copy_user(void *to, const void *from,
+                                   __kernel_size_t n);
+
+extern __kernel_size_t copy_to_user(void __user *to, const void *from,
+                                    __kernel_size_t n);
+extern __kernel_size_t copy_from_user(void *to, const void __user *from,
+                                      __kernel_size_t n);
+
+static inline __kernel_size_t __copy_to_user(void __user *to, const void *from,
+                                             __kernel_size_t n)
+{
+        return __copy_user((void __force *)to, from, n);
+}
+static inline __kernel_size_t __copy_from_user(void *to,
+                                               const void __user *from,
+                                               __kernel_size_t n)
+{
+        return __copy_user(to, (const void __force *)from, n);
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+/*
+ * put_user: - Write a simple value into user space.
+ * @x:   Value to copy to user space.
+ * @ptr: Destination address, in user space.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * This macro copies a single simple value from kernel space to user
+ * space.  It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
+ * to the result of dereferencing @ptr.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ */
+#define put_user(x,ptr) \
+        __put_user_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * get_user: - Get a simple variable from user space.
+ * @x:   Variable to store result.
+ * @ptr: Source address, in user space.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * This macro copies a single simple variable from user space to kernel
+ * space.  It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and the result of
+ * dereferencing @ptr must be assignable to @x without a cast.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ * On error, the variable @x is set to zero.
+ */
+#define get_user(x,ptr) \
+        __get_user_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * __put_user: - Write a simple value into user space, with less checking.
+ * @x:   Value to copy to user space.
+ * @ptr: Destination address, in user space.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * This macro copies a single simple value from kernel space to user
+ * space.  It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
+ * to the result of dereferencing @ptr.
+ *
+ * Caller must check the pointer with access_ok() before calling this
+ * function.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ */
+#define __put_user(x,ptr) \
+        __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * __get_user: - Get a simple variable from user space, with less checking.
+ * @x:   Variable to store result.
+ * @ptr: Source address, in user space.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * This macro copies a single simple variable from user space to kernel
+ * space.  It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and the result of
+ * dereferencing @ptr must be assignable to @x without a cast.
+ *
+ * Caller must check the pointer with access_ok() before calling this
+ * function.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ * On error, the variable @x is set to zero.
+ */
+#define __get_user(x,ptr) \
+        __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
+
+extern int __get_user_bad(void);
+extern int __put_user_bad(void);
+
+#define __get_user_nocheck(x, ptr, size)                                \
+({                                                                      \
+        typeof(*(ptr)) __gu_val = (typeof(*(ptr)) __force)0;            \
+        int __gu_err = 0;                                               \
+                                                                        \
+        switch (size) {                                                 \
+        case 1: __get_user_asm("ub", __gu_val, ptr, __gu_err); break;   \
+        case 2: __get_user_asm("uh", __gu_val, ptr, __gu_err); break;   \
+        case 4: __get_user_asm("w", __gu_val, ptr, __gu_err); break;    \
+        case 8: __get_user_asm("d", __gu_val, ptr, __gu_err); break;    \
+        default: __gu_err = __get_user_bad(); break;                    \
+        }                                                               \
+                                                                        \
+        x = __gu_val;                                                   \
+        __gu_err;                                                       \
+})
+
+#define __get_user_check(x, ptr, size)                                  \
+({                                                                      \
+        typeof(*(ptr)) __gu_val = (typeof(*(ptr)) __force)0;            \
+        const typeof(*(ptr)) __user * __gu_addr = (ptr);                \
+        int __gu_err = 0;                                               \
+                                                                        \
+        if (access_ok(VERIFY_READ, __gu_addr, size)) {                  \
+                switch (size) {                                         \
+                case 1:                                                 \
+                        __get_user_asm("ub", __gu_val, __gu_addr,       \
+                                       __gu_err);                       \
+                        break;                                          \
+                case 2:                                                 \
+                        __get_user_asm("uh", __gu_val, __gu_addr,       \
+                                       __gu_err);                       \
+                        break;                                          \
+                case 4:                                                 \
+                        __get_user_asm("w", __gu_val, __gu_addr,        \
+                                       __gu_err);                       \
+                        break;                                          \
+                case 8:                                                 \
+                        __get_user_asm("d", __gu_val, __gu_addr,        \
+                                       __gu_err);                       \
+                        break;                                          \
+                default:                                                \
+                        __gu_err = __get_user_bad();                    \
+                        break;                                          \
+                }                                                       \
+        } else {                                                        \
+                __gu_err = -EFAULT;                                     \
+        }                                                               \
+        x = __gu_val;                                                   \
+        __gu_err;                                                       \
+})
+
+#define __get_user_asm(suffix, __gu_val, ptr, __gu_err)                 \
+        asm volatile(                                                   \
+                "1:     ld." suffix "   %1, %3                  \n"     \
+                "2:                                             \n"     \
+                "       .section .fixup, \"ax\"                 \n"     \
+                "3:     mov     %0, %4                          \n"     \
+                "       rjmp    2b                              \n"     \
+                "       .previous                               \n"     \
+                "       .section __ex_table, \"a\"              \n"     \
+                "       .long   1b, 3b                          \n"     \
+                "       .previous                               \n"     \
+                : "=r"(__gu_err), "=r"(__gu_val)                        \
+                : "0"(__gu_err), "m"(*(ptr)), "i"(-EFAULT))
+
+#define __put_user_nocheck(x, ptr, size)                                \
+({                                                                      \
+        typeof(*(ptr)) __pu_val;                                        \
+        int __pu_err = 0;                                               \
+                                                                        \
+        __pu_val = (x);                                                 \
+        switch (size) {                                                 \
+        case 1: __put_user_asm("b", ptr, __pu_val, __pu_err); break;    \
+        case 2: __put_user_asm("h", ptr, __pu_val, __pu_err); break;    \
+        case 4: __put_user_asm("w", ptr, __pu_val, __pu_err); break;    \
+        case 8: __put_user_asm("d", ptr, __pu_val, __pu_err); break;    \
+        default: __pu_err = __put_user_bad(); break;                    \
+        }                                                               \
+        __pu_err;                                                       \
+})
+
+#define __put_user_check(x, ptr, size)                                  \
+({                                                                      \
+        typeof(*(ptr)) __pu_val;                                        \
+        typeof(*(ptr)) __user *__pu_addr = (ptr);                       \
+        int __pu_err = 0;                                               \
+                                                                        \
+        __pu_val = (x);                                                 \
+        if (access_ok(VERIFY_WRITE, __pu_addr, size)) {                 \
+                switch (size) {                                         \
+                case 1:                                                 \
+                        __put_user_asm("b", __pu_addr, __pu_val,        \
+                                       __pu_err);                       \
+                        break;                                          \
+                case 2:                                                 \
+                        __put_user_asm("h", __pu_addr, __pu_val,        \
+                                       __pu_err);                       \
+                        break;                                          \
+                case 4:                                                 \
+                        __put_user_asm("w", __pu_addr, __pu_val,        \
+                                       __pu_err);                       \
+                        break;                                          \
+                case 8:                                                 \
+                        __put_user_asm("d", __pu_addr, __pu_val,                \
+                                       __pu_err);                       \
+                        break;                                          \
+                default:                                                \
+                        __pu_err = __put_user_bad();                    \
+                        break;                                          \
+                }                                                       \
+        } else {                                                        \
+                __pu_err = -EFAULT;                                     \
+        }                                                               \
+        __pu_err;                                                       \
+})
+
+#define __put_user_asm(suffix, ptr, __pu_val, __gu_err)                 \
+        asm volatile(                                                   \
+                "1:     st." suffix "   %1, %3                  \n"     \
+                "2:                                             \n"     \
+                "       .section .fixup, \"ax\"                 \n"     \
+                "3:     mov     %0, %4                          \n"     \
+                "       rjmp    2b                              \n"     \
+                "       .previous                               \n"     \
+                "       .section __ex_table, \"a\"              \n"     \
+                "       .long   1b, 3b                          \n"     \
+                "       .previous                               \n"     \
+                : "=r"(__gu_err), "=m"(*(ptr))                          \
+                : "0"(__gu_err), "r"(__pu_val), "i"(-EFAULT))
+
+extern __kernel_size_t clear_user(void __user *addr, __kernel_size_t size);
+extern __kernel_size_t __clear_user(void __user *addr, __kernel_size_t size);
+
+extern long strncpy_from_user(char *dst, const char __user *src, long count);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+
+extern long strnlen_user(const char __user *__s, long __n);
+extern long __strnlen_user(const char __user *__s, long __n);
+
+#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+#endif /* __ASM_AVR32_UACCESS_H */