169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_SYSTEM_H
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#define _ASM_C6X_SYSTEM_H
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#include <linux/linkage.h>
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#include <linux/irqflags.h>
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#define prepare_to_switch() do { } while (0)
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struct task_struct;
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struct thread_struct;
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asmlinkage void *__switch_to(struct thread_struct *prev,
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struct thread_struct *next,
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struct task_struct *tsk);
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#define switch_to(prev, next, last) \
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do { \
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current->thread.wchan = (u_long) __builtin_return_address(0); \
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(last) = __switch_to(&(prev)->thread, \
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&(next)->thread, (prev)); \
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mb(); \
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current->thread.wchan = 0; \
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} while (0)
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/* Reset the board */
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#define HARD_RESET_NOW()
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#define get_creg(reg) \
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({ unsigned int __x; \
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asm volatile ("mvc .s2 " #reg ",%0\n" : "=b"(__x)); __x; })
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#define set_creg(reg, v) \
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do { unsigned int __x = (unsigned int)(v); \
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asm volatile ("mvc .s2 %0," #reg "\n" : : "b"(__x)); \
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} while (0)
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#define or_creg(reg, n) \
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do { unsigned __x, __n = (unsigned)(n); \
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asm volatile ("mvc .s2 " #reg ",%0\n" \
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"or .l2 %1,%0,%0\n" \
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"mvc .s2 %0," #reg "\n" \
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"nop\n" \
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: "=&b"(__x) : "b"(__n)); \
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} while (0)
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#define and_creg(reg, n) \
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do { unsigned __x, __n = (unsigned)(n); \
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asm volatile ("mvc .s2 " #reg ",%0\n" \
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"and .l2 %1,%0,%0\n" \
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"mvc .s2 %0," #reg "\n" \
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"nop\n" \
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: "=&b"(__x) : "b"(__n)); \
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} while (0)
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#define get_coreid() (get_creg(DNUM) & 0xff)
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/* Set/get IST */
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#define set_ist(x) set_creg(ISTP, x)
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#define get_ist() get_creg(ISTP)
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/*
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* Exception management
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*/
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asmlinkage void enable_exception(void);
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#define disable_exception()
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#define get_except_type() get_creg(EFR)
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#define ack_exception(type) set_creg(ECR, 1 << (type))
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#define get_iexcept() get_creg(IERR)
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#define set_iexcept(mask) set_creg(IERR, (mask))
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/*
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* Misc. functions
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*/
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#define nop() asm("NOP\n");
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#define mb() barrier()
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#define rmb() barrier()
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#define wmb() barrier()
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#define set_mb(var, value) do { var = value; mb(); } while (0)
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#define set_wmb(var, value) do { var = value; wmb(); } while (0)
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while (0)
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#define xchg(ptr, x) \
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((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
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sizeof(*(ptr))))
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#define tas(ptr) xchg((ptr), 1)
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unsigned int _lmbd(unsigned int, unsigned int);
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unsigned int _bitr(unsigned int);
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struct __xchg_dummy { unsigned int a[100]; };
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#define __xg(x) ((volatile struct __xchg_dummy *)(x))
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static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
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{
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unsigned int tmp;
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unsigned long flags;
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local_irq_save(flags);
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switch (size) {
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case 1:
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tmp = 0;
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tmp = *((unsigned char *) ptr);
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*((unsigned char *) ptr) = (unsigned char) x;
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break;
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case 2:
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tmp = 0;
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tmp = *((unsigned short *) ptr);
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*((unsigned short *) ptr) = x;
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break;
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case 4:
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tmp = 0;
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tmp = *((unsigned int *) ptr);
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*((unsigned int *) ptr) = x;
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break;
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}
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local_irq_restore(flags);
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return tmp;
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}
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#include <asm-generic/cmpxchg-local.h>
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/*
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
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* them available.
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*/
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#define cmpxchg_local(ptr, o, n) \
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((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
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(unsigned long)(o), \
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(unsigned long)(n), \
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sizeof(*(ptr))))
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
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#include <asm-generic/cmpxchg.h>
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#define _extu(x, s, e) \
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({ unsigned int __x; \
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asm volatile ("extu .S2 %3,%1,%2,%0\n" : \
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"=b"(__x) : "n"(s), "n"(e), "b"(x)); \
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__x; })
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extern unsigned int c6x_core_freq;
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struct pt_regs;
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extern void die(char *str, struct pt_regs *fp, int nr);
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extern asmlinkage int process_exception(struct pt_regs *regs);
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extern void time_init(void);
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extern void free_initmem(void);
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extern void (*c6x_restart)(void);
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extern void (*c6x_halt)(void);
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#endif /* _ASM_C6X_SYSTEM_H */
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