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
58 struct thread_struct
{
59 struct pt_regs
*frame
; /* [GR28] exception frame ptr for this thread */
60 struct task_struct
*curr
; /* [GR29] current pointer for this thread */
61 unsigned long sp
; /* [GR1 ] kernel stack pointer */
62 unsigned long fp
; /* [GR2 ] kernel frame pointer */
63 unsigned long lr
; /* link register */
64 unsigned long pc
; /* program counter */
65 unsigned long gr
[12]; /* [GR16-GR27] */
66 unsigned long sched_lr
; /* LR from schedule() */
69 struct pt_regs
*frame0
; /* top (user) stack frame */
70 struct user_context
*user
; /* userspace context */
72 } __attribute__((aligned(8)));
74 extern struct pt_regs
*__kernel_frame0_ptr
;
75 extern struct task_struct
*__kernel_current_task
;
80 #define INIT_THREAD_FRAME0 \
82 (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
84 #define INIT_THREAD { \
86 (struct task_struct *) init_stack, \
88 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
90 { INIT_THREAD_FRAME0 }, \
94 * do necessary setup to start up a newly executed thread.
96 #define start_thread(_regs, _pc, _usp) \
99 _regs->psr &= ~PSR_S; \
100 _regs->sp = (_usp); \
103 /* Free all resources held by a thread. */
104 static inline void release_thread(struct task_struct
*dead_task
)
108 extern asmlinkage
void save_user_regs(struct user_context
*target
);
109 extern asmlinkage
void *restore_user_regs(const struct user_context
*target
, ...);
111 #define copy_segments(tsk, mm) do { } while (0)
112 #define release_segments(mm) do { } while (0)
113 #define forget_segments() do { } while (0)
116 * Free current thread data structures etc..
118 static inline void exit_thread(void)
123 * Return saved PC of a blocked thread.
125 extern unsigned long thread_saved_pc(struct task_struct
*tsk
);
127 unsigned long get_wchan(struct task_struct
*p
);
129 #define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
130 #define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
132 #define cpu_relax() barrier()
134 /* data cache prefetch */
135 #define ARCH_HAS_PREFETCH
136 static inline void prefetch(const void *x
)
138 asm volatile("dcpl %0,gr0,#0" : : "r"(x
));
141 #endif /* __ASSEMBLY__ */
142 #endif /* _ASM_PROCESSOR_H */