arch/avr32/include/asm/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 #ifdef __KERNEL__
  17 #define STACK_TOP       TASK_SIZE
  18 #define STACK_TOP_MAX   STACK_TOP
  19 #endif
  20
  21 #ifndef __ASSEMBLY__
  22
  23 static inline void *current_text_addr(void)
  24 {
  25         register void *pc asm("pc");
  26         return pc;
  27 }
  28
  29 enum arch_type {
  30         ARCH_AVR32A,
  31         ARCH_AVR32B,
  32         ARCH_MAX
  33 };
  34
  35 enum cpu_type {
  36         CPU_MORGAN,
  37         CPU_AT32AP,
  38         CPU_MAX
  39 };
  40
  41 enum tlb_config {
  42         TLB_NONE,
  43         TLB_SPLIT,
  44         TLB_UNIFIED,
  45         TLB_INVALID
  46 };
  47
  48 #define AVR32_FEATURE_RMW       (1 << 0)
  49 #define AVR32_FEATURE_DSP       (1 << 1)
  50 #define AVR32_FEATURE_SIMD      (1 << 2)
  51 #define AVR32_FEATURE_OCD       (1 << 3)
  52 #define AVR32_FEATURE_PCTR      (1 << 4)
  53 #define AVR32_FEATURE_JAVA      (1 << 5)
  54 #define AVR32_FEATURE_FPU       (1 << 6)
  55
  56 struct avr32_cpuinfo {
  57         struct clk *clk;
  58         unsigned long loops_per_jiffy;
  59         enum arch_type arch_type;
  60         enum cpu_type cpu_type;
  61         unsigned short arch_revision;
  62         unsigned short cpu_revision;
  63         enum tlb_config tlb_config;
  64         unsigned long features;
  65         u32 device_id;
  66
  67         struct cache_info icache;
  68         struct cache_info dcache;
  69 };
  70
  71 static inline unsigned int avr32_get_manufacturer_id(struct avr32_cpuinfo *cpu)
  72 {
  73         return (cpu->device_id >> 1) & 0x7f;
  74 }
  75 static inline unsigned int avr32_get_product_number(struct avr32_cpuinfo *cpu)
  76 {
  77         return (cpu->device_id >> 12) & 0xffff;
  78 }
  79 static inline unsigned int avr32_get_chip_revision(struct avr32_cpuinfo *cpu)
  80 {
  81         return (cpu->device_id >> 28) & 0x0f;
  82 }
  83
  84 extern struct avr32_cpuinfo boot_cpu_data;
  85
  86 #ifdef CONFIG_SMP
  87 extern struct avr32_cpuinfo cpu_data[];
  88 #define current_cpu_data cpu_data[smp_processor_id()]
  89 #else
  90 #define cpu_data (&boot_cpu_data)
  91 #define current_cpu_data boot_cpu_data
  92 #endif
  93
  94 /* This decides where the kernel will search for a free chunk of vm
  95  * space during mmap's
  96  */
  97 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  98
  99 #define cpu_relax()             barrier()
 100 #define cpu_sync_pipeline()     asm volatile("sub pc, -2" : : : "memory")
 101
 102 struct cpu_context {
 103         unsigned long sr;
 104         unsigned long pc;
 105         unsigned long ksp;      /* Kernel stack pointer */
 106         unsigned long r7;
 107         unsigned long r6;
 108         unsigned long r5;
 109         unsigned long r4;
 110         unsigned long r3;
 111         unsigned long r2;
 112         unsigned long r1;
 113         unsigned long r0;
 114 };
 115
 116 /* This struct contains the CPU context as stored by switch_to() */
 117 struct thread_struct {
 118         struct cpu_context cpu_context;
 119         unsigned long single_step_addr;
 120         u16 single_step_insn;
 121 };
 122
 123 #define INIT_THREAD {                                           \
 124         .cpu_context = {                                        \
 125                 .ksp = sizeof(init_stack) + (long)&init_stack,  \
 126         },                                                      \
 127 }
 128
 129 /*
 130  * Do necessary setup to start up a newly executed thread.
 131  */
 132 #define start_thread(regs, new_pc, new_sp)       \
 133         do {                                     \
 134                 set_fs(USER_DS);                 \
 135                 memset(regs, 0, sizeof(*regs));  \
 136                 regs->sr = MODE_USER;            \
 137                 regs->pc = new_pc & ~1;          \
 138                 regs->sp = new_sp;               \
 139         } while(0)
 140
 141 struct task_struct;
 142
 143 /* Free all resources held by a thread */
 144 extern void release_thread(struct task_struct *);
 145
 146 /* Create a kernel thread without removing it from tasklists */
 147 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 148
 149 /* Prepare to copy thread state - unlazy all lazy status */
 150 #define prepare_to_copy(tsk) do { } while(0)
 151
 152 /* Return saved PC of a blocked thread */
 153 #define thread_saved_pc(tsk)    ((tsk)->thread.cpu_context.pc)
 154
 155 struct pt_regs;
 156 extern unsigned long get_wchan(struct task_struct *p);
 157 extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
 158 extern void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
 159                                struct pt_regs *regs, const char *log_lvl);
 160
 161 #define task_pt_regs(p) \
 162         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
 163
 164 #define KSTK_EIP(tsk)   ((tsk)->thread.cpu_context.pc)
 165 #define KSTK_ESP(tsk)   ((tsk)->thread.cpu_context.ksp)
 166
 167 #define ARCH_HAS_PREFETCH
 168
 169 static inline void prefetch(const void *x)
 170 {
 171         const char *c = x;
 172         asm volatile("pref %0" : : "r"(c));
 173 }
 174 #define PREFETCH_STRIDE L1_CACHE_BYTES
 175
 176 #endif /* __ASSEMBLY__ */
 177
 178 #endif /* __ASM_AVR32_PROCESSOR_H */