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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 | ||
17 | #ifdef __KERNEL__ | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | ||
21 | #include <asm/arcregs.h> /* for STATUS_E1_MASK et all */ | |
16f9afe6 | 22 | #include <asm/ptrace.h> |
3be80aae VG |
23 | |
24 | /* Arch specific stuff which needs to be saved per task. | |
25 | * However these items are not so important so as to earn a place in | |
26 | * struct thread_info | |
27 | */ | |
28 | struct thread_struct { | |
29 | unsigned long ksp; /* kernel mode stack pointer */ | |
30 | unsigned long callee_reg; /* pointer to callee regs */ | |
31 | unsigned long fault_address; /* dbls as brkpt holder as well */ | |
bf90e1ea VG |
32 | #ifdef CONFIG_ARC_FPU_SAVE_RESTORE |
33 | struct arc_fpu fpu; | |
34 | #endif | |
3be80aae VG |
35 | }; |
36 | ||
37 | #define INIT_THREAD { \ | |
38 | .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ | |
39 | } | |
40 | ||
41 | /* Forward declaration, a strange C thing */ | |
42 | struct task_struct; | |
43 | ||
44 | /* | |
45 | * Return saved PC of a blocked thread. | |
46 | */ | |
47 | unsigned long thread_saved_pc(struct task_struct *t); | |
48 | ||
49 | #define task_pt_regs(p) \ | |
283237a0 | 50 | ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) |
3be80aae VG |
51 | |
52 | /* Free all resources held by a thread. */ | |
53 | #define release_thread(thread) do { } while (0) | |
54 | ||
55 | /* Prepare to copy thread state - unlazy all lazy status */ | |
56 | #define prepare_to_copy(tsk) do { } while (0) | |
57 | ||
41195d23 VG |
58 | /* |
59 | * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise | |
60 | * get optimised away by gcc | |
61 | */ | |
62 | #ifdef CONFIG_SMP | |
63 | #define cpu_relax() __asm__ __volatile__ ("" : : : "memory") | |
64 | #else | |
3be80aae | 65 | #define cpu_relax() do { } while (0) |
41195d23 | 66 | #endif |
3be80aae | 67 | |
3be80aae VG |
68 | #define copy_segments(tsk, mm) do { } while (0) |
69 | #define release_segments(mm) do { } while (0) | |
70 | ||
71 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) | |
47746745 | 72 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) |
3be80aae VG |
73 | |
74 | /* | |
75 | * Where abouts of Task's sp, fp, blink when it was last seen in kernel mode. | |
16f9afe6 | 76 | * Look in process.c for details of kernel stack layout |
3be80aae | 77 | */ |
47746745 | 78 | #define TSK_K_ESP(tsk) (tsk->thread.ksp) |
16f9afe6 | 79 | |
47746745 | 80 | #define TSK_K_REG(tsk, off) (*((unsigned int *)(TSK_K_ESP(tsk) + \ |
16f9afe6 VG |
81 | sizeof(struct callee_regs) + off))) |
82 | ||
47746745 VG |
83 | #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) |
84 | #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) | |
3be80aae VG |
85 | |
86 | /* | |
87 | * Do necessary setup to start up a newly executed thread. | |
88 | * | |
89 | * E1,E2 so that Interrupts are enabled in user mode | |
90 | * L set, so Loop inhibited to begin with | |
91 | * lp_start and lp_end seeded with bogus non-zero values so to easily catch | |
92 | * the ARC700 sr to lp_start hardware bug | |
93 | */ | |
94 | #define start_thread(_regs, _pc, _usp) \ | |
95 | do { \ | |
96 | set_fs(USER_DS); /* reads from user space */ \ | |
97 | (_regs)->ret = (_pc); \ | |
98 | /* Interrupts enabled in User Mode */ \ | |
99 | (_regs)->status32 = STATUS_U_MASK | STATUS_L_MASK \ | |
100 | | STATUS_E1_MASK | STATUS_E2_MASK; \ | |
101 | (_regs)->sp = (_usp); \ | |
102 | /* bogus seed values for debugging */ \ | |
103 | (_regs)->lp_start = 0x10; \ | |
104 | (_regs)->lp_end = 0x80; \ | |
105 | } while (0) | |
106 | ||
107 | extern unsigned int get_wchan(struct task_struct *p); | |
108 | ||
109 | /* | |
110 | * Default implementation of macro that returns current | |
111 | * instruction pointer ("program counter"). | |
112 | * Should the PC register be read instead ? This macro does not seem to | |
113 | * be used in many places so this wont be all that bad. | |
114 | */ | |
115 | #define current_text_addr() ({ __label__ _l; _l: &&_l; }) | |
116 | ||
117 | #endif /* !__ASSEMBLY__ */ | |
118 | ||
119 | /* Kernels Virtual memory area. | |
120 | * Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a | |
121 | * "kernel translated" region (like KSEG2 in MIPS). So we use a upper part | |
122 | * of the translated bottom 2GB for kernel virtual memory and protect | |
123 | * these pages from user accesses by disabling Ru, Eu and Wu. | |
124 | */ | |
125 | #define VMALLOC_SIZE (0x10000000) /* 256M */ | |
126 | #define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE) | |
127 | #define VMALLOC_END (PAGE_OFFSET) | |
128 | ||
129 | /* Most of the architectures seem to be keeping some kind of padding between | |
130 | * userspace TASK_SIZE and PAGE_OFFSET. i.e TASK_SIZE != PAGE_OFFSET. | |
131 | */ | |
132 | #define USER_KERNEL_GUTTER 0x10000000 | |
133 | ||
134 | /* User address space: | |
135 | * On ARC700, CPU allows the entire lower half of 32 bit address space to be | |
136 | * translated. Thus potentially 2G (0:0x7FFF_FFFF) could be User vaddr space. | |
137 | * However we steal 256M for kernel addr (0x7000_0000:0x7FFF_FFFF) and another | |
138 | * 256M (0x6000_0000:0x6FFF_FFFF) is gutter between user/kernel spaces | |
139 | * Thus total User vaddr space is (0:0x5FFF_FFFF) | |
140 | */ | |
141 | #define TASK_SIZE (PAGE_OFFSET - VMALLOC_SIZE - USER_KERNEL_GUTTER) | |
142 | ||
143 | #define STACK_TOP TASK_SIZE | |
144 | #define STACK_TOP_MAX STACK_TOP | |
145 | ||
146 | /* This decides where the kernel will search for a free chunk of vm | |
147 | * space during mmap's. | |
148 | */ | |
149 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
150 | ||
151 | #endif /* __KERNEL__ */ | |
152 | ||
153 | #endif /* __ASM_ARC_PROCESSOR_H */ |