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         u32 device_id;
  61
  62         struct cache_info icache;
  63         struct cache_info dcache;
  64 };
  65
  66 static inline unsigned int avr32_get_manufacturer_id(struct avr32_cpuinfo *cpu)
  67 {
  68         return (cpu->device_id >> 1) & 0x7f;
  69 }
  70 static inline unsigned int avr32_get_product_number(struct avr32_cpuinfo *cpu)
  71 {
  72         return (cpu->device_id >> 12) & 0xffff;
  73 }
  74 static inline unsigned int avr32_get_chip_revision(struct avr32_cpuinfo *cpu)
  75 {
  76         return (cpu->device_id >> 28) & 0x0f;
  77 }
  78
  79 extern struct avr32_cpuinfo boot_cpu_data;
  80
  81 #ifdef CONFIG_SMP
  82 extern struct avr32_cpuinfo cpu_data[];
  83 #define current_cpu_data cpu_data[smp_processor_id()]
  84 #else
  85 #define cpu_data (&boot_cpu_data)
  86 #define current_cpu_data boot_cpu_data
  87 #endif
  88
  89 /* This decides where the kernel will search for a free chunk of vm
  90  * space during mmap's
  91  */
  92 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  93
  94 #define cpu_relax()             barrier()
  95 #define cpu_sync_pipeline()     asm volatile("sub pc, -2" : : : "memory")
  96
  97 struct cpu_context {
  98         unsigned long sr;
  99         unsigned long pc;
 100         unsigned long ksp;      /* Kernel stack pointer */
 101         unsigned long r7;
 102         unsigned long r6;
 103         unsigned long r5;
 104         unsigned long r4;
 105         unsigned long r3;
 106         unsigned long r2;
 107         unsigned long r1;
 108         unsigned long r0;
 109 };
 110
 111 /* This struct contains the CPU context as stored by switch_to() */
 112 struct thread_struct {
 113         struct cpu_context cpu_context;
 114         unsigned long single_step_addr;
 115         u16 single_step_insn;
 116 };
 117
 118 #define INIT_THREAD {                                           \
 119         .cpu_context = {                                        \
 120                 .ksp = sizeof(init_stack) + (long)&init_stack,  \
 121         },                                                      \
 122 }
 123
 124 /*
 125  * Do necessary setup to start up a newly executed thread.
 126  */
 127 #define start_thread(regs, new_pc, new_sp)       \
 128         do {                                     \
 129                 set_fs(USER_DS);                 \
 130                 memset(regs, 0, sizeof(*regs));  \
 131                 regs->sr = MODE_USER;            \
 132                 regs->pc = new_pc & ~1;          \
 133                 regs->sp = new_sp;               \
 134         } while(0)
 135
 136 struct task_struct;
 137
 138 /* Free all resources held by a thread */
 139 extern void release_thread(struct task_struct *);
 140
 141 /* Create a kernel thread without removing it from tasklists */
 142 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 143
 144 /* Prepare to copy thread state - unlazy all lazy status */
 145 #define prepare_to_copy(tsk) do { } while(0)
 146
 147 /* Return saved PC of a blocked thread */
 148 #define thread_saved_pc(tsk)    ((tsk)->thread.cpu_context.pc)
 149
 150 struct pt_regs;
 151 extern unsigned long get_wchan(struct task_struct *p);
 152 extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
 153 extern void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
 154                                struct pt_regs *regs, const char *log_lvl);
 155
 156 #define task_pt_regs(p) \
 157         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
 158
 159 #define KSTK_EIP(tsk)   ((tsk)->thread.cpu_context.pc)
 160 #define KSTK_ESP(tsk)   ((tsk)->thread.cpu_context.ksp)
 161
 162 #define ARCH_HAS_PREFETCH
 163
 164 static inline void prefetch(const void *x)
 165 {
 166         const char *c = x;
 167         asm volatile("pref %0" : : "r"(c));
 168 }
 169 #define PREFETCH_STRIDE L1_CACHE_BYTES
 170
 171 #endif /* __ASSEMBLY__ */
 172
 173 #endif /* __ASM_AVR32_PROCESSOR_H */