Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
4baa9922 | 2 | * arch/arm/include/asm/processor.h |
1da177e4 LT |
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 | ||
864232fa | 22 | #include <asm/hw_breakpoint.h> |
1da177e4 | 23 | #include <asm/ptrace.h> |
1da177e4 | 24 | #include <asm/types.h> |
27a84793 | 25 | #include <asm/unified.h> |
1da177e4 | 26 | |
922a70d3 | 27 | #ifdef __KERNEL__ |
794baba6 | 28 | #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ |
922a70d3 DH |
29 | TASK_SIZE : TASK_SIZE_26) |
30 | #define STACK_TOP_MAX TASK_SIZE | |
31 | #endif | |
32 | ||
1da177e4 | 33 | struct debug_info { |
864232fa WD |
34 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
35 | struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; | |
36 | #endif | |
1da177e4 LT |
37 | }; |
38 | ||
39 | struct thread_struct { | |
40 | /* fault info */ | |
41 | unsigned long address; | |
42 | unsigned long trap_no; | |
43 | unsigned long error_code; | |
44 | /* debugging */ | |
45 | struct debug_info debug; | |
46 | }; | |
47 | ||
48 | #define INIT_THREAD { } | |
49 | ||
e72b0475 HC |
50 | #ifdef CONFIG_MMU |
51 | #define nommu_start_thread(regs) do { } while (0) | |
52 | #else | |
53 | #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data | |
54 | #endif | |
55 | ||
1da177e4 LT |
56 | #define start_thread(regs,pc,sp) \ |
57 | ({ \ | |
59f0cb0f | 58 | memset(regs->uregs, 0, sizeof(regs->uregs)); \ |
1da177e4 LT |
59 | if (current->personality & ADDR_LIMIT_32BIT) \ |
60 | regs->ARM_cpsr = USR_MODE; \ | |
61 | else \ | |
62 | regs->ARM_cpsr = USR26_MODE; \ | |
63 | if (elf_hwcap & HWCAP_THUMB && pc & 1) \ | |
64 | regs->ARM_cpsr |= PSR_T_BIT; \ | |
26584853 | 65 | regs->ARM_cpsr |= PSR_ENDSTATE; \ |
1da177e4 LT |
66 | regs->ARM_pc = pc & ~1; /* pc */ \ |
67 | regs->ARM_sp = sp; /* sp */ \ | |
e72b0475 | 68 | nommu_start_thread(regs); \ |
1da177e4 LT |
69 | }) |
70 | ||
71 | /* Forward declaration, a strange C thing */ | |
72 | struct task_struct; | |
73 | ||
74 | /* Free all resources held by a thread. */ | |
75 | extern void release_thread(struct task_struct *); | |
76 | ||
1da177e4 LT |
77 | unsigned long get_wchan(struct task_struct *p); |
78 | ||
5dab26af | 79 | #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) |
534be1d5 WD |
80 | #define cpu_relax() smp_mb() |
81 | #else | |
1da177e4 | 82 | #define cpu_relax() barrier() |
534be1d5 | 83 | #endif |
1da177e4 | 84 | |
3a6bfbc9 DB |
85 | #define cpu_relax_lowlatency() cpu_relax() |
86 | ||
815d5ec8 | 87 | #define task_pt_regs(p) \ |
32d39a93 | 88 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) |
815d5ec8 AV |
89 | |
90 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc | |
91 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp | |
1da177e4 | 92 | |
27a84793 WD |
93 | #ifdef CONFIG_SMP |
94 | #define __ALT_SMP_ASM(smp, up) \ | |
95 | "9998: " smp "\n" \ | |
96 | " .pushsection \".alt.smp.init\", \"a\"\n" \ | |
97 | " .long 9998b\n" \ | |
98 | " " up "\n" \ | |
99 | " .popsection\n" | |
100 | #else | |
101 | #define __ALT_SMP_ASM(smp, up) up | |
102 | #endif | |
103 | ||
1da177e4 LT |
104 | /* |
105 | * Prefetching support - only ARMv5. | |
106 | */ | |
107 | #if __LINUX_ARM_ARCH__ >= 5 | |
108 | ||
109 | #define ARCH_HAS_PREFETCH | |
02828845 NP |
110 | static inline void prefetch(const void *ptr) |
111 | { | |
112 | __asm__ __volatile__( | |
16f719de | 113 | "pld\t%a0" |
e744dff7 | 114 | :: "p" (ptr)); |
02828845 | 115 | } |
1da177e4 | 116 | |
d8f57aa4 | 117 | #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) |
1da177e4 | 118 | #define ARCH_HAS_PREFETCHW |
d8f57aa4 WD |
119 | static inline void prefetchw(const void *ptr) |
120 | { | |
121 | __asm__ __volatile__( | |
122 | ".arch_extension mp\n" | |
123 | __ALT_SMP_ASM( | |
124 | WASM(pldw) "\t%a0", | |
125 | WASM(pld) "\t%a0" | |
126 | ) | |
127 | :: "p" (ptr)); | |
128 | } | |
129 | #endif | |
1da177e4 LT |
130 | #endif |
131 | ||
7dbaa466 RH |
132 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
133 | ||
1da177e4 LT |
134 | #endif |
135 | ||
136 | #endif /* __ASM_ARM_PROCESSOR_H */ |