1 /* processor.h: FRV processor definitions
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #ifndef _ASM_PROCESSOR_H
13 #define _ASM_PROCESSOR_H
15 #include <asm/mem-layout.h>
19 * Default implementation of macro that returns current
20 * instruction pointer ("program counter").
22 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
24 #include <linux/compiler.h>
25 #include <linux/linkage.h>
26 #include <asm/sections.h>
27 #include <asm/segment.h>
29 #include <asm/registers.h>
30 #include <asm/ptrace.h>
31 #include <asm/current.h>
32 #include <asm/cache.h>
34 /* Forward declaration, a strange C thing */
38 * CPU type and hardware bug flags. Kept separately for each CPU.
42 unsigned long *pgd_quick;
43 unsigned long *pte_quick;
44 unsigned long pgtable_cache_sz;
46 } __cacheline_aligned;
48 extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
50 #define cpu_data (&boot_cpu_data)
51 #define current_cpu_data boot_cpu_data
59 struct thread_struct {
60 struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
61 struct task_struct *curr; /* [GR29] current pointer for this thread */
62 unsigned long sp; /* [GR1 ] kernel stack pointer */
63 unsigned long fp; /* [GR2 ] kernel frame pointer */
64 unsigned long lr; /* link register */
65 unsigned long pc; /* program counter */
66 unsigned long gr[12]; /* [GR16-GR27] */
67 unsigned long sched_lr; /* LR from schedule() */
70 struct pt_regs *frame0; /* top (user) stack frame */
71 struct user_context *user; /* userspace context */
73 } __attribute__((aligned(8)));
75 extern struct pt_regs *__kernel_frame0_ptr;
76 extern struct task_struct *__kernel_current_task;
81 #define INIT_THREAD_FRAME0 \
83 (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
85 #define INIT_THREAD { \
87 (struct task_struct *) init_stack, \
89 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
91 { INIT_THREAD_FRAME0 }, \
95 * do necessary setup to start up a newly executed thread.
96 * - need to discard the frame stacked by init() invoking the execve syscall
98 #define start_thread(_regs, _pc, _usp) \
100 set_fs(USER_DS); /* reads from user space */ \
101 __frame = __kernel_frame0_ptr; \
102 __frame->pc = (_pc); \
103 __frame->psr &= ~PSR_S; \
104 __frame->sp = (_usp); \
107 extern void prepare_to_copy(struct task_struct *tsk);
109 /* Free all resources held by a thread. */
110 static inline void release_thread(struct task_struct *dead_task)
114 extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
115 extern asmlinkage void save_user_regs(struct user_context *target);
116 extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
118 #define copy_segments(tsk, mm) do { } while (0)
119 #define release_segments(mm) do { } while (0)
120 #define forget_segments() do { } while (0)
123 * Free current thread data structures etc..
125 static inline void exit_thread(void)
130 * Return saved PC of a blocked thread.
132 extern unsigned long thread_saved_pc(struct task_struct *tsk);
134 unsigned long get_wchan(struct task_struct *p);
136 #define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
137 #define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
139 /* Allocation and freeing of basic task resources. */
140 extern struct task_struct *alloc_task_struct(void);
141 extern void free_task_struct(struct task_struct *p);
143 #define cpu_relax() barrier()
145 /* data cache prefetch */
146 #define ARCH_HAS_PREFETCH
147 static inline void prefetch(const void *x)
149 asm volatile("dcpl %0,gr0,#0" : : "r"(x));
152 #endif /* __ASSEMBLY__ */
153 #endif /* _ASM_PROCESSOR_H */