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Linux/arch/c6x/include/asm/processor.h

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  1 /*
  2  *  Port on Texas Instruments TMS320C6x architecture
  3  *
  4  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
  5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
  6  *
  7  *  Updated for 2.6.34: Mark Salter <msalter@redhat.com>
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License version 2 as
 11  *  published by the Free Software Foundation.
 12  */
 13 #ifndef _ASM_C6X_PROCESSOR_H
 14 #define _ASM_C6X_PROCESSOR_H
 15 
 16 #include <asm/ptrace.h>
 17 #include <asm/page.h>
 18 #include <asm/current.h>
 19 
 20 /*
 21  * Default implementation of macro that returns current
 22  * instruction pointer ("program counter").
 23  */
 24 #define current_text_addr()                     \
 25 ({                                              \
 26         void *__pc;                             \
 27         asm("mvc .S2 pce1,%0\n" : "=b"(__pc));  \
 28         __pc;                                   \
 29 })
 30 
 31 /*
 32  * User space process size. This is mostly meaningless for NOMMU
 33  * but some C6X processors may have RAM addresses up to 0xFFFFFFFF.
 34  * Since calls like mmap() can return an address or an error, we
 35  * have to allow room for error returns when code does something
 36  * like:
 37  *
 38  *       addr = do_mmap(...)
 39  *       if ((unsigned long)addr >= TASK_SIZE)
 40  *            ... its an error code, not an address ...
 41  *
 42  * Here, we allow for 4096 error codes which means we really can't
 43  * use the last 4K page on systems with RAM extending all the way
 44  * to the end of the 32-bit address space.
 45  */
 46 #define TASK_SIZE       0xFFFFF000
 47 
 48 /*
 49  * This decides where the kernel will search for a free chunk of vm
 50  * space during mmap's. We won't be using it
 51  */
 52 #define TASK_UNMAPPED_BASE      0
 53 
 54 struct thread_struct {
 55         unsigned long long b15_14;
 56         unsigned long long a15_14;
 57         unsigned long long b13_12;
 58         unsigned long long a13_12;
 59         unsigned long long b11_10;
 60         unsigned long long a11_10;
 61         unsigned long long ricl_icl;
 62         unsigned long  usp;             /* user stack pointer */
 63         unsigned long  pc;              /* kernel pc */
 64         unsigned long  wchan;
 65 };
 66 
 67 #define INIT_THREAD                                     \
 68 {                                                       \
 69         .usp = 0,                                       \
 70         .wchan = 0,                                     \
 71 }
 72 
 73 #define INIT_MMAP { \
 74         &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
 75         NULL, NULL }
 76 
 77 #define task_pt_regs(task) \
 78         ((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1)
 79 
 80 #define alloc_kernel_stack()    __get_free_page(GFP_KERNEL)
 81 #define free_kernel_stack(page) free_page((page))
 82 
 83 
 84 /* Forward declaration, a strange C thing */
 85 struct task_struct;
 86 
 87 extern void start_thread(struct pt_regs *regs, unsigned int pc,
 88                          unsigned long usp);
 89 
 90 /* Free all resources held by a thread. */
 91 static inline void release_thread(struct task_struct *dead_task)
 92 {
 93 }
 94 
 95 #define copy_segments(tsk, mm)          do { } while (0)
 96 #define release_segments(mm)            do { } while (0)
 97 
 98 /*
 99  * saved PC of a blocked thread.
100  */
101 #define thread_saved_pc(tsk) (task_pt_regs(tsk)->pc)
102 
103 /*
104  * saved kernel SP and DP of a blocked thread.
105  */
106 #ifdef _BIG_ENDIAN
107 #define thread_saved_ksp(tsk) \
108         (*(unsigned long *)&(tsk)->thread.b15_14)
109 #define thread_saved_dp(tsk) \
110         (*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
111 #else
112 #define thread_saved_ksp(tsk) \
113         (*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
114 #define thread_saved_dp(tsk) \
115         (*(unsigned long *)&(tsk)->thread.b15_14)
116 #endif
117 
118 extern unsigned long get_wchan(struct task_struct *p);
119 
120 #define KSTK_EIP(task)  (task_pt_regs(task)->pc)
121 #define KSTK_ESP(task)  (task_pt_regs(task)->sp)
122 
123 #define cpu_relax()             do { } while (0)
124 #define cpu_relax_lowlatency()        cpu_relax()
125 
126 extern const struct seq_operations cpuinfo_op;
127 
128 /* Reset the board */
129 #define HARD_RESET_NOW()
130 
131 extern unsigned int c6x_core_freq;
132 
133 
134 extern void (*c6x_restart)(void);
135 extern void (*c6x_halt)(void);
136 
137 #endif /* ASM_C6X_PROCESSOR_H */
138 

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