1 /*
2 * arch/arm/include/asm/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>
23 #include <asm/types.h>
24
25 #ifdef __KERNEL__
26 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
27 TASK_SIZE : TASK_SIZE_26)
28 #define STACK_TOP_MAX TASK_SIZE
29 #endif
30
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
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
63 #define start_thread(regs,pc,sp) \
64 ({ \
65 unsigned long *stack = (unsigned long *)sp; \
66 set_fs(USER_DS); \
67 memset(regs->uregs, 0, 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_cpsr |= PSR_ENDSTATE; \
75 regs->ARM_pc = pc & ~1; /* pc */ \
76 regs->ARM_sp = sp; /* sp */ \
77 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
78 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
79 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
80 nommu_start_thread(regs); \
81 })
82
83 /* Forward declaration, a strange C thing */
84 struct task_struct;
85
86 /* Free all resources held by a thread. */
87 extern void release_thread(struct task_struct *);
88
89 /* Prepare to copy thread state - unlazy all lazy status */
90 #define prepare_to_copy(tsk) do { } while (0)
91
92 unsigned long get_wchan(struct task_struct *p);
93
94 #define cpu_relax() barrier()
95
96 /*
97 * Create a new kernel thread
98 */
99 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
100
101 #define task_pt_regs(p) \
102 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
103
104 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
105 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
106
107 /*
108 * Prefetching support - only ARMv5.
109 */
110 #if __LINUX_ARM_ARCH__ >= 5
111
112 #define ARCH_HAS_PREFETCH
113 static inline void prefetch(const void *ptr)
114 {
115 __asm__ __volatile__(
116 "pld\t%a0"
117 :
118 : "p" (ptr)
119 : "cc");
120 }
121
122 #define ARCH_HAS_PREFETCHW
123 #define prefetchw(ptr) prefetch(ptr)
124
125 #define ARCH_HAS_SPINLOCK_PREFETCH
126 #define spin_lock_prefetch(x) do { } while (0)
127
128 #endif
129
130 #endif
131
132 #endif /* __ASM_ARM_PROCESSOR_H */
133
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