Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#ifndef __ASSEMBLY__
18
19#include <asm/ptrace.h>
20
21#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
22/* These DPFP regs need to be saved/restored across ctx-sw */
23struct arc_fpu {
24 struct {
25 unsigned int l, h;
26 } aux_dpfp[2];
27};
28#endif
29
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 */
34struct 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 */
38#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
39 struct arc_fpu fpu;
40#endif
41};
42
43#define INIT_THREAD { \
44 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
45}
46
47/* Forward declaration, a strange C thing */
48struct task_struct;
49
50#define task_pt_regs(p) \
51 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
52
53/* Free all resources held by a thread */
54#define release_thread(thread) do { } while (0)
55
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 */
60#ifndef CONFIG_EZNPS_MTM_EXT
61
62#define cpu_relax() barrier()
63
64#else
65
66#define cpu_relax() \
67 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
68
69#endif
70
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)
75#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
76
77/*
78 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
79 * Look in process.c for details of kernel stack layout
80 */
81#define TSK_K_ESP(tsk) (tsk->thread.ksp)
82
83#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
84 sizeof(struct callee_regs) + off)))
85
86#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
87#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
88
89extern void start_thread(struct pt_regs * regs, unsigned long pc,
90 unsigned long usp);
91
92extern 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
104/*
105 * Default System Memory Map on ARC
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 * -----------------------------------------------------------------------------
116 */
117
118#define TASK_SIZE 0x60000000
119
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)
126
127#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
128
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
145#define STACK_TOP TASK_SIZE
146#endif
147
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
155#endif /* __ASM_ARC_PROCESSOR_H */