Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-v850/processor.h |
| 3 | * |
| 4 | * Copyright (C) 2001,02,03 NEC Electronics Corporation |
| 5 | * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General |
| 8 | * Public License. See the file COPYING in the main directory of this |
| 9 | * archive for more details. |
| 10 | * |
| 11 | * Written by Miles Bader <miles@gnu.org> |
| 12 | */ |
| 13 | |
| 14 | #ifndef __V850_PROCESSOR_H__ |
| 15 | #define __V850_PROCESSOR_H__ |
| 16 | |
| 17 | #include <linux/config.h> |
| 18 | #ifndef __ASSEMBLY__ /* <linux/thread_info.h> is not asm-safe. */ |
| 19 | #include <linux/thread_info.h> |
| 20 | #endif |
| 21 | |
| 22 | #include <asm/ptrace.h> |
| 23 | #include <asm/entry.h> |
| 24 | |
| 25 | /* Some code expects `segment' stuff to be defined here. */ |
| 26 | #include <asm/segment.h> |
| 27 | |
| 28 | |
| 29 | /* |
| 30 | * The only places this is used seem to be horrible bletcherous kludges, |
| 31 | * so we just define it to be as large as possible. |
| 32 | */ |
| 33 | #define TASK_SIZE (0xFFFFFFFF) |
| 34 | |
| 35 | /* |
| 36 | * This decides where the kernel will search for a free chunk of vm |
| 37 | * space during mmap's. We won't be using it. |
| 38 | */ |
| 39 | #define TASK_UNMAPPED_BASE 0 |
| 40 | |
| 41 | |
| 42 | #ifndef __ASSEMBLY__ |
| 43 | |
| 44 | |
| 45 | /* |
| 46 | * Default implementation of macro that returns current |
| 47 | * instruction pointer ("program counter"). |
| 48 | */ |
| 49 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) |
| 50 | |
| 51 | /* If you change this, you must change the associated assembly-languages |
| 52 | constants defined below, THREAD_*. */ |
| 53 | struct thread_struct { |
| 54 | /* kernel stack pointer (must be first field in structure) */ |
| 55 | unsigned long ksp; |
| 56 | }; |
| 57 | |
| 58 | #define INIT_THREAD { sizeof init_stack + (unsigned long)init_stack } |
| 59 | |
| 60 | |
| 61 | /* Do necessary setup to start up a newly executed thread. */ |
| 62 | extern inline void start_thread (struct pt_regs *regs, |
| 63 | unsigned long pc, unsigned long usp) |
| 64 | { |
| 65 | regs->pc = pc; |
| 66 | regs->gpr[GPR_SP] = usp; |
| 67 | regs->kernel_mode = 0; |
| 68 | } |
| 69 | |
| 70 | /* Free all resources held by a thread. */ |
| 71 | extern inline void release_thread (struct task_struct *dead_task) |
| 72 | { |
| 73 | } |
| 74 | |
| 75 | /* Prepare to copy thread state - unlazy all lazy status */ |
| 76 | #define prepare_to_copy(tsk) do { } while (0) |
| 77 | |
| 78 | extern int kernel_thread (int (*fn)(void *), void * arg, unsigned long flags); |
| 79 | |
| 80 | /* Free current thread data structures etc. */ |
| 81 | static inline void exit_thread (void) |
| 82 | { |
| 83 | } |
| 84 | |
| 85 | |
| 86 | /* Return the registers saved during context-switch by the currently |
| 87 | not-running thread T. Note that this only includes some registers! |
| 88 | See entry.S for details. */ |
| 89 | #define thread_saved_regs(t) \ |
| 90 | ((struct pt_regs*)((t)->thread.ksp + STATE_SAVE_PT_OFFSET)) |
| 91 | /* Return saved (kernel) PC of a blocked thread. Actually, we return the |
| 92 | LP register, because the thread is actually blocked in switch_thread, |
| 93 | and we're interested in the PC it will _return_ to. */ |
| 94 | #define thread_saved_pc(t) (thread_saved_regs(t)->gpr[GPR_LP]) |
| 95 | |
| 96 | |
| 97 | unsigned long get_wchan (struct task_struct *p); |
| 98 | |
| 99 | |
| 100 | /* Return some info about the user process TASK. */ |
| 101 | #define task_tos(task) ((unsigned long)(task)->thread_info + THREAD_SIZE) |
| 102 | #define task_regs(task) ((struct pt_regs *)task_tos (task) - 1) |
| 103 | #define task_sp(task) (task_regs (task)->gpr[GPR_SP]) |
| 104 | #define task_pc(task) (task_regs (task)->pc) |
| 105 | /* Grotty old names for some. */ |
| 106 | #define KSTK_EIP(task) task_pc (task) |
| 107 | #define KSTK_ESP(task) task_sp (task) |
| 108 | |
| 109 | |
| 110 | #define cpu_relax() ((void)0) |
| 111 | |
| 112 | |
| 113 | #else /* __ASSEMBLY__ */ |
| 114 | |
| 115 | #define THREAD_KSP 0 |
| 116 | |
| 117 | #endif /* !__ASSEMBLY__ */ |
| 118 | |
| 119 | |
| 120 | #endif /* __V850_PROCESSOR_H__ */ |