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Diffstat (limited to 'arch/c6x/include/asm/unaligned.h')
| -rw-r--r-- | arch/c6x/include/asm/unaligned.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/unaligned.h b/arch/c6x/include/asm/unaligned.h new file mode 100644 index 00000000..b976cb74 --- /dev/null +++ b/arch/c6x/include/asm/unaligned.h @@ -0,0 +1,170 @@ +/* + * Port on Texas Instruments TMS320C6x architecture + * + * Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated + * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) + * Rewritten for 2.6.3x: Mark Salter <msalter@redhat.com> + * + * 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_C6X_UNALIGNED_H +#define _ASM_C6X_UNALIGNED_H + +#include <linux/swab.h> + +/* + * The C64x+ can do unaligned word and dword accesses in hardware + * using special load/store instructions. + */ + +static inline u16 get_unaligned_le16(const void *p) +{ + const u8 *_p = p; + return _p[0] | _p[1] << 8; +} + +static inline u16 get_unaligned_be16(const void *p) +{ + const u8 *_p = p; + return _p[0] << 8 | _p[1]; +} + +static inline void put_unaligned_le16(u16 val, void *p) +{ + u8 *_p = p; + _p[0] = val; + _p[1] = val >> 8; +} + +static inline void put_unaligned_be16(u16 val, void *p) +{ + u8 *_p = p; + _p[0] = val >> 8; + _p[1] = val; +} + +static inline u32 get_unaligned32(const void *p) +{ + u32 val = (u32) p; + asm (" ldnw .d1t1 *%0,%0\n" + " nop 4\n" + : "+a"(val)); + return val; +} + +static inline void put_unaligned32(u32 val, void *p) +{ + asm volatile (" stnw .d2t1 %0,*%1\n" + : : "a"(val), "b"(p) : "memory"); +} + +static inline u64 get_unaligned64(const void *p) +{ + u64 val; + asm volatile (" ldndw .d1t1 *%1,%0\n" + " nop 4\n" + : "=a"(val) : "a"(p)); + return val; +} + +static inline void put_unaligned64(u64 val, const void *p) +{ + asm volatile (" stndw .d2t1 %0,*%1\n" + : : "a"(val), "b"(p) : "memory"); +} + +#ifdef CONFIG_CPU_BIG_ENDIAN + +#define get_unaligned_le32(p) __swab32(get_unaligned32(p)) +#define get_unaligned_le64(p) __swab64(get_unaligned64(p)) +#define get_unaligned_be32(p) get_unaligned32(p) +#define get_unaligned_be64(p) get_unaligned64(p) +#define put_unaligned_le32(v, p) put_unaligned32(__swab32(v), (p)) +#define put_unaligned_le64(v, p) put_unaligned64(__swab64(v), (p)) +#define put_unaligned_be32(v, p) put_unaligned32((v), (p)) +#define put_unaligned_be64(v, p) put_unaligned64((v), (p)) +#define get_unaligned __get_unaligned_be +#define put_unaligned __put_unaligned_be + +#else + +#define get_unaligned_le32(p) get_unaligned32(p) +#define get_unaligned_le64(p) get_unaligned64(p) +#define get_unaligned_be32(p) __swab32(get_unaligned32(p)) +#define get_unaligned_be64(p) __swab64(get_unaligned64(p)) +#define put_unaligned_le32(v, p) put_unaligned32((v), (p)) +#define put_unaligned_le64(v, p) put_unaligned64((v), (p)) +#define put_unaligned_be32(v, p) put_unaligned32(__swab32(v), (p)) +#define put_unaligned_be64(v, p) put_unaligned64(__swab64(v), (p)) +#define get_unaligned __get_unaligned_le +#define put_unaligned __put_unaligned_le + +#endif + +/* + * Cause a link-time error if we try an unaligned access other than + * 1,2,4 or 8 bytes long + */ +extern int __bad_unaligned_access_size(void); + +#define __get_unaligned_le(ptr) (typeof(*(ptr)))({ \ + sizeof(*(ptr)) == 1 ? *(ptr) : \ + (sizeof(*(ptr)) == 2 ? get_unaligned_le16((ptr)) : \ + (sizeof(*(ptr)) == 4 ? get_unaligned_le32((ptr)) : \ + (sizeof(*(ptr)) == 8 ? get_unaligned_le64((ptr)) : \ + __bad_unaligned_access_size()))); \ + }) + +#define __get_unaligned_be(ptr) (__force typeof(*(ptr)))({ \ + sizeof(*(ptr)) == 1 ? *(ptr) : \ + (sizeof(*(ptr)) == 2 ? get_unaligned_be16((ptr)) : \ + (sizeof(*(ptr)) == 4 ? get_unaligned_be32((ptr)) : \ + (sizeof(*(ptr)) == 8 ? get_unaligned_be64((ptr)) : \ + __bad_unaligned_access_size()))); \ + }) + +#define __put_unaligned_le(val, ptr) ({ \ + void *__gu_p = (ptr); \ + switch (sizeof(*(ptr))) { \ + case 1: \ + *(u8 *)__gu_p = (__force u8)(val); \ + break; \ + case 2: \ + put_unaligned_le16((__force u16)(val), __gu_p); \ + break; \ + case 4: \ + put_unaligned_le32((__force u32)(val), __gu_p); \ + break; \ + case 8: \ + put_unaligned_le64((__force u64)(val), __gu_p); \ + break; \ + default: \ + __bad_unaligned_access_size(); \ + break; \ + } \ + (void)0; }) + +#define __put_unaligned_be(val, ptr) ({ \ + void *__gu_p = (ptr); \ + switch (sizeof(*(ptr))) { \ + case 1: \ + *(u8 *)__gu_p = (__force u8)(val); \ + break; \ + case 2: \ + put_unaligned_be16((__force u16)(val), __gu_p); \ + break; \ + case 4: \ + put_unaligned_be32((__force u32)(val), __gu_p); \ + break; \ + case 8: \ + put_unaligned_be64((__force u64)(val), __gu_p); \ + break; \ + default: \ + __bad_unaligned_access_size(); \ + break; \ + } \ + (void)0; }) + +#endif /* _ASM_C6X_UNALIGNED_H */ |