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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 <asm/page.h>
17#include <asm/ptrace.h>
18#include <asm/cpu-regs.h>
19#include <linux/threads.h>
20
21/* Forward declaration, a strange C thing */
22struct task_struct;
23struct mm_struct;
24
25/*
26 * Default implementation of macro that returns current
27 * instruction pointer ("program counter").
28 */
29#define current_text_addr() \
30({ \
31 void *__pc; \
32 asm("mov pc,%0" : "=a"(__pc)); \
33 __pc; \
34})
35
36extern void show_registers(struct pt_regs *regs);
37
38/*
39 * CPU type and hardware bug flags. Kept separately for each CPU.
40 * Members of this structure are referenced in head.S, so think twice
41 * before touching them. [mj]
42 */
43
44struct mn10300_cpuinfo {
45 int type;
46 unsigned long loops_per_sec;
47 char hard_math;
48 unsigned long *pgd_quick;
49 unsigned long *pte_quick;
50 unsigned long pgtable_cache_sz;
51};
52
53extern struct mn10300_cpuinfo boot_cpu_data;
54
55#define cpu_data &boot_cpu_data
56#define current_cpu_data boot_cpu_data
57
58extern void identify_cpu(struct mn10300_cpuinfo *);
59extern void print_cpu_info(struct mn10300_cpuinfo *);
60extern void dodgy_tsc(void);
61#define cpu_relax() do {} while (0)
62
63/*
64 * User space process size: 1.75GB (default).
65 */
66#define TASK_SIZE 0x70000000
67
68/*
69 * Where to put the userspace stack by default
70 */
71#define STACK_TOP 0x70000000
72#define STACK_TOP_MAX STACK_TOP
73
74/* This decides where the kernel will search for a free chunk of vm
75 * space during mmap's.
76 */
77#define TASK_UNMAPPED_BASE 0x30000000
78
79typedef struct {
80 unsigned long seg;
81} mm_segment_t;
82
83struct fpu_state_struct {
84 unsigned long fs[32]; /* fpu registers */
85 unsigned long fpcr; /* fpu control register */
86};
87
88struct thread_struct {
89 struct pt_regs *uregs; /* userspace register frame */
90 unsigned long pc; /* kernel PC */
91 unsigned long sp; /* kernel SP */
92 unsigned long a3; /* kernel FP */
93 unsigned long wchan;
94 unsigned long usp;
95 struct pt_regs *__frame;
96 unsigned long fpu_flags;
97#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
98 struct fpu_state_struct fpu_state;
99};
100
101#define INIT_THREAD \
102{ \
103 .uregs = init_uregs, \
104 .pc = 0, \
105 .sp = 0, \
106 .a3 = 0, \
107 .wchan = 0, \
108 .__frame = NULL, \
109}
110
111#define INIT_MMAP \
112{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
113 NULL, NULL }
114
115/*
116 * do necessary setup to start up a newly executed thread
117 * - need to discard the frame stacked by the kernel thread invoking the execve
118 * syscall (see RESTORE_ALL macro)
119 */
120#define start_thread(regs, new_pc, new_sp) do { \
121 set_fs(USER_DS); \
122 __frame = current->thread.uregs; \
123 __frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; \
124 __frame->pc = new_pc; \
125 __frame->sp = new_sp; \
126} while (0)
127
128/* Free all resources held by a thread. */
129extern void release_thread(struct task_struct *);
130
131/* Prepare to copy thread state - unlazy all lazy status */
132extern void prepare_to_copy(struct task_struct *tsk);
133
134/*
135 * create a kernel thread without removing it from tasklists
136 */
137extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
138
139/*
140 * Return saved PC of a blocked thread.
141 */
142extern unsigned long thread_saved_pc(struct task_struct *tsk);
143
144unsigned long get_wchan(struct task_struct *p);
145
146#define task_pt_regs(task) \
147({ \
148 struct pt_regs *__regs__; \
149 __regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
150 __regs__ - 1; \
151})
152
153#define KSTK_EIP(task) (task_pt_regs(task)->pc)
154#define KSTK_ESP(task) (task_pt_regs(task)->sp)
155
156#define KSTK_TOP(info) \
157({ \
158 (unsigned long)(info) + THREAD_SIZE; \
159})
160
161#define ARCH_HAS_PREFETCH
162#define ARCH_HAS_PREFETCHW
163
164static inline void prefetch(const void *x)
165{
166#ifndef CONFIG_MN10300_CACHE_DISABLED
167#ifdef CONFIG_MN10300_PROC_MN103E010
168 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
169#else
170 asm volatile ("dcpf (%0)" : : "r"(x));
171#endif
172#endif
173}
174
175static inline void prefetchw(const void *x)
176{
177#ifndef CONFIG_MN10300_CACHE_DISABLED
178#ifdef CONFIG_MN10300_PROC_MN103E010
179 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
180#else
181 asm volatile ("dcpf (%0)" : : "r"(x));
182#endif
183#endif
184}
185
186#endif /* _ASM_PROCESSOR_H */
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