projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* processor.h: FRV processor definitions |
| 2 | * | |
| 3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells ([email protected]) | |
| 5 | * | |
| 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. | |
| 10 | */ | |
| 11 | ||
| 12 | #ifndef _ASM_PROCESSOR_H | |
| 13 | #define _ASM_PROCESSOR_H | |
| 14 | ||
| 1da177e4 LT |
15 | #include <asm/mem-layout.h> |
| 16 | ||
| 17 | #ifndef __ASSEMBLY__ | |
| 18 | /* | |
| 19 | * Default implementation of macro that returns current | |
| 20 | * instruction pointer ("program counter"). | |
| 21 | */ | |
| 22 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
| 23 | ||
| f6dc8c5b | 24 | #include <linux/compiler.h> |
| 1da177e4 LT |
25 | #include <linux/linkage.h> |
| 26 | #include <asm/sections.h> | |
| 27 | #include <asm/segment.h> | |
| 28 | #include <asm/fpu.h> | |
| 29 | #include <asm/registers.h> | |
| 30 | #include <asm/ptrace.h> | |
| 31 | #include <asm/current.h> | |
| 32 | #include <asm/cache.h> | |
| 33 | ||
| 34 | /* Forward declaration, a strange C thing */ | |
| 35 | struct task_struct; | |
| 36 | ||
| 37 | /* | |
| 38 | * CPU type and hardware bug flags. Kept separately for each CPU. | |
| 39 | */ | |
| 40 | struct cpuinfo_frv { | |
| 41 | #ifdef CONFIG_MMU | |
| 42 | unsigned long *pgd_quick; | |
| 43 | unsigned long *pte_quick; | |
| 44 | unsigned long pgtable_cache_sz; | |
| 45 | #endif | |
| 46 | } __cacheline_aligned; | |
| 47 | ||
| 48 | extern struct cpuinfo_frv __nongprelbss boot_cpu_data; | |
| 49 | ||
| 50 | #define cpu_data (&boot_cpu_data) | |
| 51 | #define current_cpu_data boot_cpu_data | |
| 52 | ||
| 53 | /* | |
| 54 | * Bus types | |
| 55 | */ | |
| 56 | #define EISA_bus 0 | |
| 57 | #define MCA_bus 0 | |
| 58 | ||
| 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() */ | |
| 68 | ||
| 69 | union { | |
| 70 | struct pt_regs *frame0; /* top (user) stack frame */ | |
| 71 | struct user_context *user; /* userspace context */ | |
| 72 | }; | |
| 73 | } __attribute__((aligned(8))); | |
| 74 | ||
| 75 | extern struct pt_regs *__kernel_frame0_ptr; | |
| 76 | extern struct task_struct *__kernel_current_task; | |
| 77 | ||
| 78 | #endif | |
| 79 | ||
| 80 | #ifndef __ASSEMBLY__ | |
| 81 | #define INIT_THREAD_FRAME0 \ | |
| 82 | ((struct pt_regs *) \ | |
| 83 | (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context))) | |
| 84 | ||
| 85 | #define INIT_THREAD { \ | |
| 86 | NULL, \ | |
| 87 | (struct task_struct *) init_stack, \ | |
| 88 | 0, 0, 0, 0, \ | |
| 89 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \ | |
| 90 | 0, \ | |
| 91 | { INIT_THREAD_FRAME0 }, \ | |
| 92 | } | |
| 93 | ||
| 94 | /* | |
| 95 | * do necessary setup to start up a newly executed thread. | |
| 96 | * - need to discard the frame stacked by init() invoking the execve syscall | |
| 97 | */ | |
| 98 | #define start_thread(_regs, _pc, _usp) \ | |
| 99 | do { \ | |
| 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); \ | |
| 105 | } while(0) | |
| 106 | ||
| 107 | extern void prepare_to_copy(struct task_struct *tsk); | |
| 108 | ||
| 109 | /* Free all resources held by a thread. */ | |
| 110 | static inline void release_thread(struct task_struct *dead_task) | |
| 111 | { | |
| 112 | } | |
| 113 | ||
| 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, ...); | |
| 117 | ||
| 118 | #define copy_segments(tsk, mm) do { } while (0) | |
| 119 | #define release_segments(mm) do { } while (0) | |
| 120 | #define forget_segments() do { } while (0) | |
| 121 | ||
| 122 | /* | |
| 123 | * Free current thread data structures etc.. | |
| 124 | */ | |
| 125 | static inline void exit_thread(void) | |
| 126 | { | |
| 127 | } | |
| 128 | ||
| 129 | /* | |
| 130 | * Return saved PC of a blocked thread. | |
| 131 | */ | |
| 132 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
| 133 | ||
| 134 | unsigned long get_wchan(struct task_struct *p); | |
| 135 | ||
| 136 | #define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc) | |
| 137 | #define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp) | |
| 138 | ||
| 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); | |
| 142 | ||
| f6dc8c5b | 143 | #define cpu_relax() barrier() |
| 1da177e4 LT |
144 | |
| 145 | /* data cache prefetch */ | |
| 146 | #define ARCH_HAS_PREFETCH | |
| 147 | static inline void prefetch(const void *x) | |
| 148 | { | |
| 149 | asm volatile("dcpl %0,gr0,#0" : : "r"(x)); | |
| 150 | } | |
| 151 | ||
| 152 | #endif /* __ASSEMBLY__ */ | |
| 153 | #endif /* _ASM_PROCESSOR_H */ |