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3be80aae VG |
1 | /* |
2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * vineetg: March 2009 | |
9 | * -Implemented task_pt_regs( ) | |
10 | * | |
11 | * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004 | |
12 | */ | |
13 | ||
14 | #ifndef __ASM_ARC_PROCESSOR_H | |
15 | #define __ASM_ARC_PROCESSOR_H | |
16 | ||
3be80aae VG |
17 | #ifndef __ASSEMBLY__ |
18 | ||
16f9afe6 | 19 | #include <asm/ptrace.h> |
3be80aae | 20 | |
52e9bae9 VG |
21 | #ifdef CONFIG_ARC_FPU_SAVE_RESTORE |
22 | /* These DPFP regs need to be saved/restored across ctx-sw */ | |
23 | struct arc_fpu { | |
24 | struct { | |
25 | unsigned int l, h; | |
26 | } aux_dpfp[2]; | |
27 | }; | |
28 | #endif | |
29 | ||
3be80aae VG |
30 | /* Arch specific stuff which needs to be saved per task. |
31 | * However these items are not so important so as to earn a place in | |
32 | * struct thread_info | |
33 | */ | |
34 | struct thread_struct { | |
35 | unsigned long ksp; /* kernel mode stack pointer */ | |
36 | unsigned long callee_reg; /* pointer to callee regs */ | |
37 | unsigned long fault_address; /* dbls as brkpt holder as well */ | |
bf90e1ea VG |
38 | #ifdef CONFIG_ARC_FPU_SAVE_RESTORE |
39 | struct arc_fpu fpu; | |
40 | #endif | |
3be80aae VG |
41 | }; |
42 | ||
43 | #define INIT_THREAD { \ | |
44 | .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ | |
45 | } | |
46 | ||
47 | /* Forward declaration, a strange C thing */ | |
48 | struct task_struct; | |
49 | ||
2ab402df | 50 | /* Return saved PC of a blocked thread */ |
3be80aae VG |
51 | unsigned long thread_saved_pc(struct task_struct *t); |
52 | ||
53 | #define task_pt_regs(p) \ | |
283237a0 | 54 | ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) |
3be80aae | 55 | |
2ab402df | 56 | /* Free all resources held by a thread */ |
3be80aae VG |
57 | #define release_thread(thread) do { } while (0) |
58 | ||
59 | /* Prepare to copy thread state - unlazy all lazy status */ | |
60 | #define prepare_to_copy(tsk) do { } while (0) | |
61 | ||
41195d23 VG |
62 | /* |
63 | * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise | |
64 | * get optimised away by gcc | |
65 | */ | |
66 | #ifdef CONFIG_SMP | |
67 | #define cpu_relax() __asm__ __volatile__ ("" : : : "memory") | |
68 | #else | |
3be80aae | 69 | #define cpu_relax() do { } while (0) |
41195d23 | 70 | #endif |
3be80aae | 71 | |
3a6bfbc9 DB |
72 | #define cpu_relax_lowlatency() cpu_relax() |
73 | ||
3be80aae VG |
74 | #define copy_segments(tsk, mm) do { } while (0) |
75 | #define release_segments(mm) do { } while (0) | |
76 | ||
77 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) | |
78 | ||
79 | /* | |
80 | * Where abouts of Task's sp, fp, blink when it was last seen in kernel mode. | |
16f9afe6 | 81 | * Look in process.c for details of kernel stack layout |
3be80aae VG |
82 | */ |
83 | #define KSTK_ESP(tsk) (tsk->thread.ksp) | |
16f9afe6 VG |
84 | |
85 | #define KSTK_REG(tsk, off) (*((unsigned int *)(KSTK_ESP(tsk) + \ | |
86 | sizeof(struct callee_regs) + off))) | |
87 | ||
88 | #define KSTK_BLINK(tsk) KSTK_REG(tsk, 4) | |
89 | #define KSTK_FP(tsk) KSTK_REG(tsk, 0) | |
3be80aae | 90 | |
2ab402df VG |
91 | extern void start_thread(struct pt_regs * regs, unsigned long pc, |
92 | unsigned long usp); | |
3be80aae VG |
93 | |
94 | extern unsigned int get_wchan(struct task_struct *p); | |
95 | ||
96 | /* | |
97 | * Default implementation of macro that returns current | |
98 | * instruction pointer ("program counter"). | |
99 | * Should the PC register be read instead ? This macro does not seem to | |
100 | * be used in many places so this wont be all that bad. | |
101 | */ | |
102 | #define current_text_addr() ({ __label__ _l; _l: &&_l; }) | |
103 | ||
104 | #endif /* !__ASSEMBLY__ */ | |
105 | ||
106 | /* Kernels Virtual memory area. | |
107 | * Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a | |
108 | * "kernel translated" region (like KSEG2 in MIPS). So we use a upper part | |
109 | * of the translated bottom 2GB for kernel virtual memory and protect | |
110 | * these pages from user accesses by disabling Ru, Eu and Wu. | |
111 | */ | |
112 | #define VMALLOC_SIZE (0x10000000) /* 256M */ | |
113 | #define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE) | |
114 | #define VMALLOC_END (PAGE_OFFSET) | |
115 | ||
116 | /* Most of the architectures seem to be keeping some kind of padding between | |
117 | * userspace TASK_SIZE and PAGE_OFFSET. i.e TASK_SIZE != PAGE_OFFSET. | |
118 | */ | |
119 | #define USER_KERNEL_GUTTER 0x10000000 | |
120 | ||
121 | /* User address space: | |
122 | * On ARC700, CPU allows the entire lower half of 32 bit address space to be | |
123 | * translated. Thus potentially 2G (0:0x7FFF_FFFF) could be User vaddr space. | |
124 | * However we steal 256M for kernel addr (0x7000_0000:0x7FFF_FFFF) and another | |
125 | * 256M (0x6000_0000:0x6FFF_FFFF) is gutter between user/kernel spaces | |
126 | * Thus total User vaddr space is (0:0x5FFF_FFFF) | |
127 | */ | |
128 | #define TASK_SIZE (PAGE_OFFSET - VMALLOC_SIZE - USER_KERNEL_GUTTER) | |
129 | ||
130 | #define STACK_TOP TASK_SIZE | |
131 | #define STACK_TOP_MAX STACK_TOP | |
132 | ||
133 | /* This decides where the kernel will search for a free chunk of vm | |
134 | * space during mmap's. | |
135 | */ | |
136 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
137 | ||
3be80aae | 138 | #endif /* __ASM_ARC_PROCESSOR_H */ |