include/asm-avr32/processor.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_AVR32_PROCESSOR_H
   9 #define __ASM_AVR32_PROCESSOR_H
  10
  11 #include <asm/page.h>
  12 #include <asm/cache.h>
  13
  14 #define TASK_SIZE       0x80000000
  15
  16 #ifndef __ASSEMBLY__
  17
  18 static inline void *current_text_addr(void)
  19 {
  20         register void *pc asm("pc");
  21         return pc;
  22 }
  23
  24 enum arch_type {
  25         ARCH_AVR32A,
  26         ARCH_AVR32B,
  27         ARCH_MAX
  28 };
  29
  30 enum cpu_type {
  31         CPU_MORGAN,
  32         CPU_AT32AP,
  33         CPU_MAX
  34 };
  35
  36 enum tlb_config {
  37         TLB_NONE,
  38         TLB_SPLIT,
  39         TLB_UNIFIED,
  40         TLB_INVALID
  41 };
  42
  43 #define AVR32_FEATURE_RMW       (1 << 0)
  44 #define AVR32_FEATURE_DSP       (1 << 1)
  45 #define AVR32_FEATURE_SIMD      (1 << 2)
  46 #define AVR32_FEATURE_OCD       (1 << 3)
  47 #define AVR32_FEATURE_PCTR      (1 << 4)
  48 #define AVR32_FEATURE_JAVA      (1 << 5)
  49 #define AVR32_FEATURE_FPU       (1 << 6)
  50
  51 struct avr32_cpuinfo {
  52         struct clk *clk;
  53         unsigned long loops_per_jiffy;
  54         enum arch_type arch_type;
  55         enum cpu_type cpu_type;
  56         unsigned short arch_revision;
  57         unsigned short cpu_revision;
  58         enum tlb_config tlb_config;
  59         unsigned long features;
  60
  61         struct cache_info icache;
  62         struct cache_info dcache;
  63 };
  64
  65 extern struct avr32_cpuinfo boot_cpu_data;
  66
  67 #ifdef CONFIG_SMP
  68 extern struct avr32_cpuinfo cpu_data[];
  69 #define current_cpu_data cpu_data[smp_processor_id()]
  70 #else
  71 #define cpu_data (&boot_cpu_data)
  72 #define current_cpu_data boot_cpu_data
  73 #endif
  74
  75 /* This decides where the kernel will search for a free chunk of vm
  76  * space during mmap's
  77  */
  78 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  79
  80 #define cpu_relax()             barrier()
  81 #define cpu_sync_pipeline()     asm volatile("sub pc, -2" : : : "memory")
  82
  83 struct cpu_context {
  84         unsigned long sr;
  85         unsigned long pc;
  86         unsigned long ksp;      /* Kernel stack pointer */
  87         unsigned long r7;
  88         unsigned long r6;
  89         unsigned long r5;
  90         unsigned long r4;
  91         unsigned long r3;
  92         unsigned long r2;
  93         unsigned long r1;
  94         unsigned long r0;
  95 };
  96
  97 /* This struct contains the CPU context as stored by switch_to() */
  98 struct thread_struct {
  99         struct cpu_context cpu_context;
 100         unsigned long single_step_addr;
 101         u16 single_step_insn;
 102 };
 103
 104 #define INIT_THREAD {                                           \
 105         .cpu_context = {                                        \
 106                 .ksp = sizeof(init_stack) + (long)&init_stack,  \
 107         },                                                      \
 108 }
 109
 110 /*
 111  * Do necessary setup to start up a newly executed thread.
 112  */
 113 #define start_thread(regs, new_pc, new_sp)       \
 114         do {                                     \
 115                 set_fs(USER_DS);                 \
 116                 memset(regs, 0, sizeof(*regs));  \
 117                 regs->sr = MODE_USER;            \
 118                 regs->pc = new_pc & ~1;          \
 119                 regs->sp = new_sp;               \
 120         } while(0)
 121
 122 struct task_struct;
 123
 124 /* Free all resources held by a thread */
 125 extern void release_thread(struct task_struct *);
 126
 127 /* Create a kernel thread without removing it from tasklists */
 128 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 129
 130 /* Prepare to copy thread state - unlazy all lazy status */
 131 #define prepare_to_copy(tsk) do { } while(0)
 132
 133 /* Return saved PC of a blocked thread */
 134 #define thread_saved_pc(tsk)    ((tsk)->thread.cpu_context.pc)
 135
 136 struct pt_regs;
 137 extern unsigned long get_wchan(struct task_struct *p);
 138 extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
 139 extern void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
 140                                struct pt_regs *regs, const char *log_lvl);
 141
 142 #define KSTK_EIP(tsk)   ((tsk)->thread.cpu_context.pc)
 143 #define KSTK_ESP(tsk)   ((tsk)->thread.cpu_context.ksp)
 144
 145 #define ARCH_HAS_PREFETCH
 146
 147 static inline void prefetch(const void *x)
 148 {
 149         const char *c = x;
 150         asm volatile("pref %0" : : "r"(c));
 151 }
 152 #define PREFETCH_STRIDE L1_CACHE_BYTES
 153
 154 #endif /* __ASSEMBLY__ */
 155
 156 #endif /* __ASM_AVR32_PROCESSOR_H */