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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 | ||
3be80aae | 50 | #define task_pt_regs(p) \ |
283237a0 | 51 | ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) |
3be80aae | 52 | |
2ab402df | 53 | /* Free all resources held by a thread */ |
3be80aae VG |
54 | #define release_thread(thread) do { } while (0) |
55 | ||
41195d23 VG |
56 | /* |
57 | * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise | |
58 | * get optimised away by gcc | |
59 | */ | |
46c3e6b8 | 60 | #ifndef CONFIG_EZNPS_MTM_EXT |
3be80aae | 61 | |
46c3e6b8 TZ |
62 | #define cpu_relax() barrier() |
63 | #define cpu_relax_lowlatency() cpu_relax() | |
64 | ||
65 | #else | |
66 | ||
67 | #define cpu_relax() \ | |
68 | __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") | |
69 | ||
70 | #define cpu_relax_lowlatency() barrier() | |
71 | ||
72 | #endif | |
3a6bfbc9 | 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) | |
13648b01 | 78 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) |
3be80aae VG |
79 | |
80 | /* | |
2547476a | 81 | * Where about of Task's sp, fp, blink when it was last seen in kernel mode. |
16f9afe6 | 82 | * Look in process.c for details of kernel stack layout |
3be80aae | 83 | */ |
13648b01 | 84 | #define TSK_K_ESP(tsk) (tsk->thread.ksp) |
16f9afe6 | 85 | |
1269f4d5 | 86 | #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ |
16f9afe6 VG |
87 | sizeof(struct callee_regs) + off))) |
88 | ||
13648b01 VG |
89 | #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) |
90 | #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) | |
3be80aae | 91 | |
3240dd57 VG |
92 | #define thread_saved_pc(tsk) TSK_K_BLINK(tsk) |
93 | ||
2ab402df VG |
94 | extern void start_thread(struct pt_regs * regs, unsigned long pc, |
95 | unsigned long usp); | |
3be80aae VG |
96 | |
97 | extern unsigned int get_wchan(struct task_struct *p); | |
98 | ||
99 | /* | |
100 | * Default implementation of macro that returns current | |
101 | * instruction pointer ("program counter"). | |
102 | * Should the PC register be read instead ? This macro does not seem to | |
103 | * be used in many places so this wont be all that bad. | |
104 | */ | |
105 | #define current_text_addr() ({ __label__ _l; _l: &&_l; }) | |
106 | ||
107 | #endif /* !__ASSEMBLY__ */ | |
108 | ||
4db27dca | 109 | /* |
15ca68a9 | 110 | * Default System Memory Map on ARC |
4db27dca VG |
111 | * |
112 | * ---------------------------- (lower 2G, Translated) ------------------------- | |
113 | * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) | |
114 | * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) | |
115 | * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) | |
116 | * | |
117 | * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- | |
118 | * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) | |
119 | * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) | |
120 | * ----------------------------------------------------------------------------- | |
3be80aae | 121 | */ |
45890f6d | 122 | |
15ca68a9 | 123 | #define TASK_SIZE 0x60000000 |
3be80aae | 124 | |
15ca68a9 NC |
125 | #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) |
126 | ||
127 | /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ | |
128 | #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) | |
129 | ||
130 | #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) | |
3be80aae | 131 | |
15ca68a9 | 132 | #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) |
3be80aae | 133 | |
8bcf2c48 NC |
134 | #ifdef CONFIG_ARC_PLAT_EZNPS |
135 | /* NPS architecture defines special window of 129M in user address space for | |
136 | * special memory areas, when accessing this window the MMU do not use TLB. | |
137 | * Instead MMU direct the access to: | |
138 | * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) | |
139 | * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) | |
140 | * | |
141 | * CMEM - is the fastest memory we got and its size is 16K. | |
142 | * FMT - is used to map either to internal/external memory. | |
143 | * Internal memory is the second fast memory and its size is 16M | |
144 | * External memory is the biggest memory (16G) and also the slowest. | |
145 | * | |
146 | * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. | |
147 | */ | |
148 | #define STACK_TOP 0x57e00000 | |
149 | #else | |
3be80aae | 150 | #define STACK_TOP TASK_SIZE |
8bcf2c48 NC |
151 | #endif |
152 | ||
3be80aae VG |
153 | #define STACK_TOP_MAX STACK_TOP |
154 | ||
155 | /* This decides where the kernel will search for a free chunk of vm | |
156 | * space during mmap's. | |
157 | */ | |
158 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
159 | ||
3be80aae | 160 | #endif /* __ASM_ARC_PROCESSOR_H */ |