blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 271 insertions, 0 deletions

diff --git a/include/asm-blackfin/uaccess.h b/include/asm-blackfin/uaccess.h
new file mode 100644
index 000000000000..bfcb6794c672
--- /dev/null
+++ b/include/asm-blackfin/uaccess.h
@@ -0,0 +1,271 @@
+/* Changes made by Lineo Inc.    May 2001
+ *
+ * Based on: include/asm-m68knommu/uaccess.h
+ */
+
+#ifndef __BLACKFIN_UACCESS_H
+#define __BLACKFIN_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+
+#include <asm/segment.h>
+#ifndef CONFIG_NO_ACCESS_CHECK
+# include <asm/bfin-global.h>
+#endif
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+        current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a,b) ((a) == (b))
+
+#define VERIFY_READ     0
+#define VERIFY_WRITE    1
+
+#define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size))
+
+static inline int is_in_rom(unsigned long addr)
+{
+        /*
+         * What we are really trying to do is determine if addr is
+         * in an allocated kernel memory region. If not then assume
+         * we cannot free it or otherwise de-allocate it. Ideally
+         * we could restrict this to really being in a ROM or flash,
+         * but that would need to be done on a board by board basis,
+         * not globally.
+         */
+        if ((addr < _ramstart) || (addr >= _ramend))
+                return (1);
+
+        /* Default case, not in ROM */
+        return (0);
+}
+
+/*
+ * 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.
+ */
+
+#ifdef CONFIG_NO_ACCESS_CHECK
+static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
+#else
+#ifdef CONFIG_ACCESS_OK_L1
+extern int _access_ok(unsigned long addr, unsigned long size)__attribute__((l1_text));
+#else
+extern int _access_ok(unsigned long addr, unsigned long size);
+#endif
+#endif
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+        unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+extern unsigned long search_exception_table(unsigned long);
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ */
+
+#define put_user(x,p)                                           \
+        ({                                                      \
+                int _err = 0;                                   \
+                typeof(*(p)) _x = (x);                          \
+                typeof(*(p)) *_p = (p);                         \
+                if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
+                        _err = -EFAULT;                         \
+                }                                               \
+                else {                                          \
+                switch (sizeof (*(_p))) {                       \
+                case 1:                                         \
+                        __put_user_asm(_x, _p, B);              \
+                        break;                                  \
+                case 2:                                         \
+                        __put_user_asm(_x, _p, W);              \
+                        break;                                  \
+                case 4:                                         \
+                        __put_user_asm(_x, _p,  );              \
+                        break;                                  \
+                case 8: {                                       \
+                        long _xl, _xh;                          \
+                        _xl = ((long *)&_x)[0];                 \
+                        _xh = ((long *)&_x)[1];                 \
+                        __put_user_asm(_xl, ((long *)_p)+0, );  \
+                        __put_user_asm(_xh, ((long *)_p)+1, );  \
+                } break;                                        \
+                default:                                        \
+                        _err = __put_user_bad();                \
+                        break;                                  \
+                }                                               \
+                }                                               \
+                _err;                                           \
+        })
+
+#define __put_user(x,p) put_user(x,p)
+static inline int bad_user_access_length(void)
+{
+        panic("bad_user_access_length");
+        return -1;
+}
+
+#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
+                           __FILE__, __LINE__, __FUNCTION__),\
+                           bad_user_access_length(), (-EFAULT))
+
+/*
+ * Tell gcc we read from memory instead of writing: this is because
+ * we do not write to any memory gcc knows about, so there are no
+ * aliasing issues.
+ */
+
+#define __ptr(x) ((unsigned long *)(x))
+
+#define __put_user_asm(x,p,bhw)                         \
+        __asm__ (#bhw"[%1] = %0;\n\t"                   \
+                 : /* no outputs */                     \
+                 :"d" (x),"a" (__ptr(p)) : "memory")
+
+#define get_user(x,p)                                                   \
+        ({                                                              \
+                int _err = 0;                                           \
+                typeof(*(p)) *_p = (p);                                 \
+                if (!access_ok(VERIFY_READ, _p, sizeof(*(_p)))) {       \
+                        _err = -EFAULT;                                 \
+                }                                                       \
+                else {                                                  \
+                switch (sizeof(*(_p))) {                                \
+                case 1:                                                 \
+                        __get_user_asm(x, _p, B,(Z));                   \
+                        break;                                          \
+                case 2:                                                 \
+                        __get_user_asm(x, _p, W,(Z));                   \
+                        break;                                          \
+                case 4:                                                 \
+                        __get_user_asm(x, _p,  , );                     \
+                        break;                                          \
+                case 8: {                                               \
+                        unsigned long _xl, _xh;                         \
+                        __get_user_asm(_xl, ((unsigned long *)_p)+0,  , ); \
+                        __get_user_asm(_xh, ((unsigned long *)_p)+1,  , ); \
+                        ((unsigned long *)&x)[0] = _xl;                 \
+                        ((unsigned long *)&x)[1] = _xh;                 \
+                } break;                                                \
+                default:                                                \
+                        x = 0;                                          \
+                        printk(KERN_INFO "get_user_bad: %s:%d %s\n",    \
+                               __FILE__, __LINE__, __FUNCTION__);       \
+                        _err = __get_user_bad();                        \
+                        break;                                          \
+                }                                                       \
+                }                                                       \
+                _err;                                                   \
+        })
+
+#define __get_user(x,p) get_user(x,p)
+
+#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
+
+#define __get_user_asm(x,p,bhw,option)                          \
+        {                                                       \
+                unsigned long _tmp;                             \
+                __asm__ ("%0 =" #bhw "[%1]"#option";\n\t"       \
+                         : "=d" (_tmp)                          \
+                         : "a" (__ptr(p)));                     \
+                (x) = (__typeof__(*(p))) _tmp;                  \
+        }
+
+#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
+#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\
+                                                 return retval; })
+
+#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\
+                                                   return retval; })
+
+static inline long copy_from_user(void *to,
+                                  const void __user * from, unsigned long n)
+{
+        if (access_ok(VERIFY_READ, from, n))
+                memcpy(to, from, n);
+        else
+                return n;
+        return 0;
+}
+
+static inline long copy_to_user(void *to,
+                                const void __user * from, unsigned long n)
+{
+        if (access_ok(VERIFY_WRITE, to, n))
+                memcpy(to, from, n);
+        else
+                return n;
+        return 0;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+static inline long strncpy_from_user(char *dst,
+                                     const char *src, long count)
+{
+        char *tmp;
+        if (!access_ok(VERIFY_READ, src, 1))
+                return -EFAULT;
+        strncpy(dst, src, count);
+        for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
+        return (tmp - dst);
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+static inline long strnlen_user(const char *src, long n)
+{
+        return (strlen(src) + 1);
+}
+
+#define strlen_user(str) strnlen_user(str, 32767)
+
+/*
+ * Zero Userspace
+ */
+
+static inline unsigned long __clear_user(void *to, unsigned long n)
+{
+        memset(to, 0, n);
+        return 0;
+}
+
+#define clear_user(to, n) __clear_user(to, n)
+
+#endif                          /* _BLACKFIN_UACCESS_H */