tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/* No SMP support so far */
87#define current_cpu_data boot_cpu_data
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
97struct 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() */
112struct 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 memset(regs, 0, sizeof(*regs)); \
130 regs->sr = MODE_USER; \
131 regs->pc = new_pc & ~1; \
132 regs->sp = new_sp; \
133 } while(0)
134
135struct task_struct;
136
137/* Free all resources held by a thread */
138extern void release_thread(struct task_struct *);
139
140/* Return saved PC of a blocked thread */
141#define thread_saved_pc(tsk) ((tsk)->thread.cpu_context.pc)
142
143struct pt_regs;
144extern unsigned long get_wchan(struct task_struct *p);
145extern void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl);
146extern void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
147 struct pt_regs *regs, const char *log_lvl);
148
149#define task_pt_regs(p) \
150 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
151
152#define KSTK_EIP(tsk) ((tsk)->thread.cpu_context.pc)
153#define KSTK_ESP(tsk) ((tsk)->thread.cpu_context.ksp)
154
155#define ARCH_HAS_PREFETCH
156
157static inline void prefetch(const void *x)
158{
159 const char *c = x;
160 asm volatile("pref %0" : : "r"(c));
161}
162#define PREFETCH_STRIDE L1_CACHE_BYTES
163
164#endif /* __ASSEMBLY__ */
165
166#endif /* __ASM_AVR32_PROCESSOR_H */