linux/arch/avr32/include/asm/processor.h
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   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
  23static inline void *current_text_addr(void)
  24{
  25        register void *pc asm("pc");
  26        return pc;
  27}
  28
  29enum arch_type {
  30        ARCH_AVR32A,
  31        ARCH_AVR32B,
  32        ARCH_MAX
  33};
  34
  35enum cpu_type {
  36        CPU_MORGAN,
  37        CPU_AT32AP,
  38        CPU_MAX
  39};
  40
  41enum 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
  56struct 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
  71static inline unsigned int avr32_get_manufacturer_id(struct avr32_cpuinfo *cpu)
  72{
  73        return (cpu->device_id >> 1) & 0x7f;
  74}
  75static inline unsigned int avr32_get_product_number(struct avr32_cpuinfo *cpu)
  76{
  77        return (cpu->device_id >> 12) & 0xffff;
  78}
  79static inline unsigned int avr32_get_chip_revision(struct avr32_cpuinfo *cpu)
  80{
  81        return (cpu->device_id >> 28) & 0x0f;
  82}
  83
  84extern struct avr32_cpuinfo boot_cpu_data;
  85
  86#ifdef CONFIG_SMP
  87extern 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
 102struct 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() */
 117struct 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
 141struct task_struct;
 142
 143/* Free all resources held by a thread */
 144extern void release_thread(struct task_struct *);
 145
 146/* Create a kernel thread without removing it from tasklists */
 147extern 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
 155struct pt_regs;
 156extern unsigned long get_wchan(struct task_struct *p);
 157extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
 158extern 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
 169static 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 */
 179