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
current_text_addr(void)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
avr32_get_manufacturer_id(struct avr32_cpuinfo * cpu)71 static inline unsigned int avr32_get_manufacturer_id(struct avr32_cpuinfo *cpu)
72 {
73 return (cpu->device_id >> 1) & 0x7f;
74 }
avr32_get_product_number(struct avr32_cpuinfo * cpu)75 static inline unsigned int avr32_get_product_number(struct avr32_cpuinfo *cpu)
76 {
77 return (cpu->device_id >> 12) & 0xffff;
78 }
avr32_get_chip_revision(struct avr32_cpuinfo * cpu)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 memset(regs, 0, sizeof(*regs)); \
135 regs->sr = MODE_USER; \
136 regs->pc = new_pc & ~1; \
137 regs->sp = new_sp; \
138 } while(0)
139
140 struct task_struct;
141
142 /* Free all resources held by a thread */
143 extern void release_thread(struct task_struct *);
144
145 /* Create a kernel thread without removing it from tasklists */
146 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
147
148 /* Prepare to copy thread state - unlazy all lazy status */
149 #define prepare_to_copy(tsk) do { } while(0)
150
151 /* Return saved PC of a blocked thread */
152 #define thread_saved_pc(tsk) ((tsk)->thread.cpu_context.pc)
153
154 struct pt_regs;
155 extern unsigned long get_wchan(struct task_struct *p);
156 extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
157 extern void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
158 struct pt_regs *regs, const char *log_lvl);
159
160 #define task_pt_regs(p) \
161 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
162
163 #define KSTK_EIP(tsk) ((tsk)->thread.cpu_context.pc)
164 #define KSTK_ESP(tsk) ((tsk)->thread.cpu_context.ksp)
165
166 #define ARCH_HAS_PREFETCH
167
prefetch(const void * x)168 static inline void prefetch(const void *x)
169 {
170 const char *c = x;
171 asm volatile("pref %0" : : "r"(c));
172 }
173 #define PREFETCH_STRIDE L1_CACHE_BYTES
174
175 #endif /* __ASSEMBLY__ */
176
177 #endif /* __ASM_AVR32_PROCESSOR_H */
178