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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/processor.h | |
3 | * | |
4 | * Copyright (C) 1995-1999 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #ifndef __ASM_ARM_PROCESSOR_H | |
12 | #define __ASM_ARM_PROCESSOR_H | |
13 | ||
14 | /* | |
15 | * Default implementation of macro that returns current | |
16 | * instruction pointer ("program counter"). | |
17 | */ | |
18 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
19 | ||
20 | #ifdef __KERNEL__ | |
21 | ||
22 | #include <asm/ptrace.h> | |
1da177e4 LT |
23 | #include <asm/types.h> |
24 | ||
922a70d3 DH |
25 | #ifdef __KERNEL__ |
26 | #define STACK_TOP ((current->personality == PER_LINUX_32BIT) ? \ | |
27 | TASK_SIZE : TASK_SIZE_26) | |
28 | #define STACK_TOP_MAX TASK_SIZE | |
29 | #endif | |
30 | ||
1da177e4 LT |
31 | union debug_insn { |
32 | u32 arm; | |
33 | u16 thumb; | |
34 | }; | |
35 | ||
36 | struct debug_entry { | |
37 | u32 address; | |
38 | union debug_insn insn; | |
39 | }; | |
40 | ||
41 | struct debug_info { | |
42 | int nsaved; | |
43 | struct debug_entry bp[2]; | |
44 | }; | |
45 | ||
46 | struct thread_struct { | |
47 | /* fault info */ | |
48 | unsigned long address; | |
49 | unsigned long trap_no; | |
50 | unsigned long error_code; | |
51 | /* debugging */ | |
52 | struct debug_info debug; | |
53 | }; | |
54 | ||
55 | #define INIT_THREAD { } | |
56 | ||
e72b0475 HC |
57 | #ifdef CONFIG_MMU |
58 | #define nommu_start_thread(regs) do { } while (0) | |
59 | #else | |
60 | #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data | |
61 | #endif | |
62 | ||
1da177e4 LT |
63 | #define start_thread(regs,pc,sp) \ |
64 | ({ \ | |
65 | unsigned long *stack = (unsigned long *)sp; \ | |
66 | set_fs(USER_DS); \ | |
67 | memzero(regs->uregs, sizeof(regs->uregs)); \ | |
68 | if (current->personality & ADDR_LIMIT_32BIT) \ | |
69 | regs->ARM_cpsr = USR_MODE; \ | |
70 | else \ | |
71 | regs->ARM_cpsr = USR26_MODE; \ | |
72 | if (elf_hwcap & HWCAP_THUMB && pc & 1) \ | |
73 | regs->ARM_cpsr |= PSR_T_BIT; \ | |
74 | regs->ARM_pc = pc & ~1; /* pc */ \ | |
75 | regs->ARM_sp = sp; /* sp */ \ | |
76 | regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ | |
77 | regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ | |
78 | regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ | |
e72b0475 | 79 | nommu_start_thread(regs); \ |
1da177e4 LT |
80 | }) |
81 | ||
82 | /* Forward declaration, a strange C thing */ | |
83 | struct task_struct; | |
84 | ||
85 | /* Free all resources held by a thread. */ | |
86 | extern void release_thread(struct task_struct *); | |
87 | ||
88 | /* Prepare to copy thread state - unlazy all lazy status */ | |
89 | #define prepare_to_copy(tsk) do { } while (0) | |
90 | ||
91 | unsigned long get_wchan(struct task_struct *p); | |
92 | ||
93 | #define cpu_relax() barrier() | |
94 | ||
95 | /* | |
96 | * Create a new kernel thread | |
97 | */ | |
98 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
99 | ||
815d5ec8 | 100 | #define task_pt_regs(p) \ |
32d39a93 | 101 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) |
815d5ec8 AV |
102 | |
103 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc | |
104 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp | |
1da177e4 LT |
105 | |
106 | /* | |
107 | * Prefetching support - only ARMv5. | |
108 | */ | |
109 | #if __LINUX_ARM_ARCH__ >= 5 | |
110 | ||
111 | #define ARCH_HAS_PREFETCH | |
02828845 NP |
112 | static inline void prefetch(const void *ptr) |
113 | { | |
114 | __asm__ __volatile__( | |
115 | "pld\t%0" | |
116 | : | |
117 | : "o" (*(char *)ptr) | |
118 | : "cc"); | |
119 | } | |
1da177e4 LT |
120 | |
121 | #define ARCH_HAS_PREFETCHW | |
122 | #define prefetchw(ptr) prefetch(ptr) | |
123 | ||
124 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
125 | #define spin_lock_prefetch(x) do { } while (0) | |
126 | ||
127 | #endif | |
128 | ||
129 | #endif | |
130 | ||
131 | #endif /* __ASM_ARM_PROCESSOR_H */ |