1 /* MN10300 Processor specifics
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)
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.
13 #ifndef _ASM_PROCESSOR_H
14 #define _ASM_PROCESSOR_H
16 #include <linux/threads.h>
17 #include <linux/thread_info.h>
19 #include <asm/ptrace.h>
20 #include <asm/cpu-regs.h>
21 #include <asm/uaccess.h>
22 #include <asm/current.h>
24 /* Forward declaration, a strange C thing */
29 * Default implementation of macro that returns current
30 * instruction pointer ("program counter").
32 #define current_text_addr() \
35 asm("mov pc,%0" : "=a"(__pc)); \
39 extern void get_mem_info(unsigned long *mem_base
, unsigned long *mem_size
);
41 extern void show_registers(struct pt_regs
*regs
);
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]
49 struct mn10300_cpuinfo
{
51 unsigned long loops_per_jiffy
;
55 extern struct mn10300_cpuinfo boot_cpu_data
;
58 #if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
59 # error Sorry, NR_CPUS should be 2 to 8
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 */
68 extern void identify_cpu(struct mn10300_cpuinfo
*);
69 extern void print_cpu_info(struct mn10300_cpuinfo
*);
70 extern void dodgy_tsc(void);
71 #define cpu_relax() barrier()
74 * User space process size: 1.75GB (default).
76 #define TASK_SIZE 0x70000000
79 * Where to put the userspace stack by default
81 #define STACK_TOP 0x70000000
82 #define STACK_TOP_MAX STACK_TOP
84 /* This decides where the kernel will search for a free chunk of vm
85 * space during mmap's.
87 #define TASK_UNMAPPED_BASE 0x30000000
89 struct fpu_state_struct
{
90 unsigned long fs
[32]; /* fpu registers */
91 unsigned long fpcr
; /* fpu control register */
94 struct thread_struct
{
95 struct pt_regs
*uregs
; /* userspace register frame */
96 unsigned long pc
; /* kernel PC */
97 unsigned long sp
; /* kernel SP */
98 unsigned long a3
; /* kernel FP */
101 unsigned long fpu_flags
;
102 #define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
103 #define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
104 struct fpu_state_struct fpu_state
;
107 #define INIT_THREAD \
109 .uregs = init_uregs, \
117 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
121 * do necessary setup to start up a newly executed thread
122 * - need to discard the frame stacked by the kernel thread invoking the execve
123 * syscall (see RESTORE_ALL macro)
125 static inline void start_thread(struct pt_regs
*regs
,
126 unsigned long new_pc
, unsigned long new_sp
)
128 struct thread_info
*ti
= current_thread_info();
129 struct pt_regs
*frame0
;
132 frame0
= thread_info_to_uregs(ti
);
133 frame0
->epsw
= EPSW_nSL
| EPSW_IE
| EPSW_IM
;
140 /* Free all resources held by a thread. */
141 extern void release_thread(struct task_struct
*);
143 /* Prepare to copy thread state - unlazy all lazy status */
144 extern void prepare_to_copy(struct task_struct
*tsk
);
147 * create a kernel thread without removing it from tasklists
149 extern int kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
152 * Return saved PC of a blocked thread.
154 extern unsigned long thread_saved_pc(struct task_struct
*tsk
);
156 unsigned long get_wchan(struct task_struct
*p
);
158 #define task_pt_regs(task) ((task)->thread.uregs)
159 #define KSTK_EIP(task) (task_pt_regs(task)->pc)
160 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
162 #define KSTK_TOP(info) \
164 (unsigned long)(info) + THREAD_SIZE; \
167 #define ARCH_HAS_PREFETCH
168 #define ARCH_HAS_PREFETCHW
170 static inline void prefetch(const void *x
)
172 #ifdef CONFIG_MN10300_CACHE_ENABLED
173 #ifdef CONFIG_MN10300_PROC_MN103E010
174 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x
));
176 asm volatile ("dcpf (%0)" : : "r"(x
));
181 static inline void prefetchw(const void *x
)
183 #ifdef CONFIG_MN10300_CACHE_ENABLED
184 #ifdef CONFIG_MN10300_PROC_MN103E010
185 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x
));
187 asm volatile ("dcpf (%0)" : : "r"(x
));
192 #endif /* _ASM_PROCESSOR_H */