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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 | 62 | #define cpu_relax() barrier() |
46c3e6b8 TZ |
63 | |
64 | #else | |
65 | ||
66 | #define cpu_relax() \ | |
67 | __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") | |
68 | ||
46c3e6b8 | 69 | #endif |
3a6bfbc9 | 70 | |
3be80aae VG |
71 | #define copy_segments(tsk, mm) do { } while (0) |
72 | #define release_segments(mm) do { } while (0) | |
73 | ||
74 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) | |
13648b01 | 75 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) |
3be80aae VG |
76 | |
77 | /* | |
2547476a | 78 | * Where about of Task's sp, fp, blink when it was last seen in kernel mode. |
16f9afe6 | 79 | * Look in process.c for details of kernel stack layout |
3be80aae | 80 | */ |
13648b01 | 81 | #define TSK_K_ESP(tsk) (tsk->thread.ksp) |
16f9afe6 | 82 | |
1269f4d5 | 83 | #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ |
16f9afe6 VG |
84 | sizeof(struct callee_regs) + off))) |
85 | ||
13648b01 VG |
86 | #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) |
87 | #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) | |
3be80aae | 88 | |
2ab402df VG |
89 | extern void start_thread(struct pt_regs * regs, unsigned long pc, |
90 | unsigned long usp); | |
3be80aae VG |
91 | |
92 | extern unsigned int get_wchan(struct task_struct *p); | |
93 | ||
94 | /* | |
95 | * Default implementation of macro that returns current | |
96 | * instruction pointer ("program counter"). | |
97 | * Should the PC register be read instead ? This macro does not seem to | |
98 | * be used in many places so this wont be all that bad. | |
99 | */ | |
100 | #define current_text_addr() ({ __label__ _l; _l: &&_l; }) | |
101 | ||
102 | #endif /* !__ASSEMBLY__ */ | |
103 | ||
4db27dca | 104 | /* |
15ca68a9 | 105 | * Default System Memory Map on ARC |
4db27dca VG |
106 | * |
107 | * ---------------------------- (lower 2G, Translated) ------------------------- | |
108 | * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) | |
109 | * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) | |
110 | * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) | |
111 | * | |
112 | * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- | |
113 | * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) | |
114 | * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) | |
115 | * ----------------------------------------------------------------------------- | |
3be80aae | 116 | */ |
45890f6d | 117 | |
15ca68a9 | 118 | #define TASK_SIZE 0x60000000 |
3be80aae | 119 | |
15ca68a9 NC |
120 | #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) |
121 | ||
122 | /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ | |
123 | #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) | |
124 | ||
125 | #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) | |
3be80aae | 126 | |
15ca68a9 | 127 | #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) |
3be80aae | 128 | |
8bcf2c48 NC |
129 | #ifdef CONFIG_ARC_PLAT_EZNPS |
130 | /* NPS architecture defines special window of 129M in user address space for | |
131 | * special memory areas, when accessing this window the MMU do not use TLB. | |
132 | * Instead MMU direct the access to: | |
133 | * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) | |
134 | * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) | |
135 | * | |
136 | * CMEM - is the fastest memory we got and its size is 16K. | |
137 | * FMT - is used to map either to internal/external memory. | |
138 | * Internal memory is the second fast memory and its size is 16M | |
139 | * External memory is the biggest memory (16G) and also the slowest. | |
140 | * | |
141 | * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. | |
142 | */ | |
143 | #define STACK_TOP 0x57e00000 | |
144 | #else | |
3be80aae | 145 | #define STACK_TOP TASK_SIZE |
8bcf2c48 NC |
146 | #endif |
147 | ||
3be80aae VG |
148 | #define STACK_TOP_MAX STACK_TOP |
149 | ||
150 | /* This decides where the kernel will search for a free chunk of vm | |
151 | * space during mmap's. | |
152 | */ | |
153 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
154 | ||
3be80aae | 155 | #endif /* __ASM_ARC_PROCESSOR_H */ |