Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 2 | * arch/arm/include/asm/processor.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 22 | #include <asm/hw_breakpoint.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/types.h> |
| 25 | |
David Howells | 922a70d | 2008-02-08 04:19:26 -0800 | [diff] [blame] | 26 | #ifdef __KERNEL__ |
Lennert Buytenhek | 794baba | 2008-12-05 03:25:47 +0100 | [diff] [blame] | 27 | #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ |
David Howells | 922a70d | 2008-02-08 04:19:26 -0800 | [diff] [blame] | 28 | TASK_SIZE : TASK_SIZE_26) |
| 29 | #define STACK_TOP_MAX TASK_SIZE |
| 30 | #endif |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | struct debug_info { |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 33 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 34 | struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; |
| 35 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | struct thread_struct { |
| 39 | /* fault info */ |
| 40 | unsigned long address; |
| 41 | unsigned long trap_no; |
| 42 | unsigned long error_code; |
| 43 | /* debugging */ |
| 44 | struct debug_info debug; |
| 45 | }; |
| 46 | |
| 47 | #define INIT_THREAD { } |
| 48 | |
Hyok S. Choi | e72b047 | 2006-01-13 21:04:17 +0000 | [diff] [blame] | 49 | #ifdef CONFIG_MMU |
| 50 | #define nommu_start_thread(regs) do { } while (0) |
| 51 | #else |
| 52 | #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data |
| 53 | #endif |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define start_thread(regs,pc,sp) \ |
| 56 | ({ \ |
Russell King | 59f0cb0 | 2008-10-27 11:24:09 +0000 | [diff] [blame] | 57 | memset(regs->uregs, 0, sizeof(regs->uregs)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | if (current->personality & ADDR_LIMIT_32BIT) \ |
| 59 | regs->ARM_cpsr = USR_MODE; \ |
| 60 | else \ |
| 61 | regs->ARM_cpsr = USR26_MODE; \ |
| 62 | if (elf_hwcap & HWCAP_THUMB && pc & 1) \ |
| 63 | regs->ARM_cpsr |= PSR_T_BIT; \ |
Catalin Marinas | 2658485 | 2009-05-30 14:00:18 +0100 | [diff] [blame] | 64 | regs->ARM_cpsr |= PSR_ENDSTATE; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | regs->ARM_pc = pc & ~1; /* pc */ \ |
| 66 | regs->ARM_sp = sp; /* sp */ \ |
Hyok S. Choi | e72b047 | 2006-01-13 21:04:17 +0000 | [diff] [blame] | 67 | nommu_start_thread(regs); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | }) |
| 69 | |
| 70 | /* Forward declaration, a strange C thing */ |
| 71 | struct task_struct; |
| 72 | |
| 73 | /* Free all resources held by a thread. */ |
| 74 | extern void release_thread(struct task_struct *); |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | unsigned long get_wchan(struct task_struct *p); |
| 77 | |
Will Deacon | 5dab26af | 2011-03-04 12:38:54 +0100 | [diff] [blame] | 78 | #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) |
Will Deacon | 534be1d | 2010-06-21 15:29:03 +0100 | [diff] [blame] | 79 | #define cpu_relax() smp_mb() |
| 80 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | #define cpu_relax() barrier() |
Will Deacon | 534be1d | 2010-06-21 15:29:03 +0100 | [diff] [blame] | 82 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 84 | #define task_pt_regs(p) \ |
Al Viro | 32d39a9 | 2006-01-12 01:05:58 -0800 | [diff] [blame] | 85 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 86 | |
| 87 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc |
| 88 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | /* |
| 91 | * Prefetching support - only ARMv5. |
| 92 | */ |
| 93 | #if __LINUX_ARM_ARCH__ >= 5 |
| 94 | |
| 95 | #define ARCH_HAS_PREFETCH |
Nicolas Pitre | 0282884 | 2006-12-13 18:39:26 +0100 | [diff] [blame] | 96 | static inline void prefetch(const void *ptr) |
| 97 | { |
| 98 | __asm__ __volatile__( |
Nicolas Pitre | 16f719d | 2008-08-12 22:10:59 +0100 | [diff] [blame] | 99 | "pld\t%a0" |
Nicolas Pitre | 0282884 | 2006-12-13 18:39:26 +0100 | [diff] [blame] | 100 | : |
Nicolas Pitre | 16f719d | 2008-08-12 22:10:59 +0100 | [diff] [blame] | 101 | : "p" (ptr) |
Nicolas Pitre | 0282884 | 2006-12-13 18:39:26 +0100 | [diff] [blame] | 102 | : "cc"); |
| 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | #define ARCH_HAS_PREFETCHW |
| 106 | #define prefetchw(ptr) prefetch(ptr) |
| 107 | |
| 108 | #define ARCH_HAS_SPINLOCK_PREFETCH |
| 109 | #define spin_lock_prefetch(x) do { } while (0) |
| 110 | |
| 111 | #endif |
| 112 | |
Rob Herring | 7dbaa46 | 2011-11-22 04:01:07 +0100 | [diff] [blame] | 113 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | #endif |
| 116 | |
| 117 | #endif /* __ASM_ARM_PROCESSOR_H */ |