1 /* MN10300 Processor specifics
2 *
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
11 */
12
13 #ifndef _ASM_PROCESSOR_H
14 #define _ASM_PROCESSOR_H
15
16 #include <linux/threads.h>
17 #include <linux/thread_info.h>
18 #include <asm/page.h>
19 #include <asm/ptrace.h>
20 #include <asm/cpu-regs.h>
21 #include <asm/uaccess.h>
22 #include <asm/current.h>
23
24 /* Forward declaration, a strange C thing */
25 struct task_struct;
26 struct mm_struct;
27
28 /*
29 * Default implementation of macro that returns current
30 * instruction pointer ("program counter").
31 */
32 #define current_text_addr() \
33 ({ \
34 void *__pc; \
35 asm("mov pc,%0" : "=a"(__pc)); \
36 __pc; \
37 })
38
39 extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
40
41 extern void show_registers(struct pt_regs *regs);
42
43 /*
44 * CPU type and hardware bug flags. Kept separately for each CPU.
45 * Members of this structure are referenced in head.S, so think twice
46 * before touching them. [mj]
47 */
48
49 struct mn10300_cpuinfo {
50 int type;
51 unsigned long loops_per_jiffy;
52 char hard_math;
53 };
54
55 extern struct mn10300_cpuinfo boot_cpu_data;
56
57 #ifdef CONFIG_SMP
58 #if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
59 # error Sorry, NR_CPUS should be 2 to 8
60 #endif
61 extern struct mn10300_cpuinfo cpu_data[];
62 #define current_cpu_data cpu_data[smp_processor_id()]
63 #else /* CONFIG_SMP */
64 #define cpu_data &boot_cpu_data
65 #define current_cpu_data boot_cpu_data
66 #endif /* CONFIG_SMP */
67
68 extern void identify_cpu(struct mn10300_cpuinfo *);
69 extern void print_cpu_info(struct mn10300_cpuinfo *);
70 extern void dodgy_tsc(void);
71
72 #define cpu_relax() barrier()
73 #define cpu_relax_lowlatency() cpu_relax()
74
75 /*
76 * User space process size: 1.75GB (default).
77 */
78 #define TASK_SIZE 0x70000000
79
80 /*
81 * Where to put the userspace stack by default
82 */
83 #define STACK_TOP 0x70000000
84 #define STACK_TOP_MAX STACK_TOP
85
86 /* This decides where the kernel will search for a free chunk of vm
87 * space during mmap's.
88 */
89 #define TASK_UNMAPPED_BASE 0x30000000
90
91 struct fpu_state_struct {
92 unsigned long fs[32]; /* fpu registers */
93 unsigned long fpcr; /* fpu control register */
94 };
95
96 struct thread_struct {
97 struct pt_regs *uregs; /* userspace register frame */
98 unsigned long pc; /* kernel PC */
99 unsigned long sp; /* kernel SP */
100 unsigned long a3; /* kernel FP */
101 unsigned long wchan;
102 unsigned long usp;
103 unsigned long fpu_flags;
104 #define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
105 #define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
106 struct fpu_state_struct fpu_state;
107 };
108
109 #define INIT_THREAD \
110 { \
111 .uregs = init_uregs, \
112 .pc = 0, \
113 .sp = 0, \
114 .a3 = 0, \
115 .wchan = 0, \
116 }
117
118 #define INIT_MMAP \
119 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
120 NULL, NULL }
121
122 /*
123 * do necessary setup to start up a newly executed thread
124 */
start_thread(struct pt_regs * regs,unsigned long new_pc,unsigned long new_sp)125 static inline void start_thread(struct pt_regs *regs,
126 unsigned long new_pc, unsigned long new_sp)
127 {
128 regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
129 regs->pc = new_pc;
130 regs->sp = new_sp;
131 }
132
133
134 /* Free all resources held by a thread. */
135 extern void release_thread(struct task_struct *);
136
137 /*
138 * Return saved PC of a blocked thread.
139 */
140 extern unsigned long thread_saved_pc(struct task_struct *tsk);
141
142 unsigned long get_wchan(struct task_struct *p);
143
144 #define task_pt_regs(task) ((task)->thread.uregs)
145 #define KSTK_EIP(task) (task_pt_regs(task)->pc)
146 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
147
148 #define KSTK_TOP(info) \
149 ({ \
150 (unsigned long)(info) + THREAD_SIZE; \
151 })
152
153 #define ARCH_HAS_PREFETCH
154 #define ARCH_HAS_PREFETCHW
155
prefetch(const void * x)156 static inline void prefetch(const void *x)
157 {
158 #ifdef CONFIG_MN10300_CACHE_ENABLED
159 #ifdef CONFIG_MN10300_PROC_MN103E010
160 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
161 #else
162 asm volatile ("dcpf (%0)" : : "r"(x));
163 #endif
164 #endif
165 }
166
prefetchw(const void * x)167 static inline void prefetchw(const void *x)
168 {
169 #ifdef CONFIG_MN10300_CACHE_ENABLED
170 #ifdef CONFIG_MN10300_PROC_MN103E010
171 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
172 #else
173 asm volatile ("dcpf (%0)" : : "r"(x));
174 #endif
175 #endif
176 }
177
178 #endif /* _ASM_PROCESSOR_H */
179