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#ifdef CONFIG_ARC_PLAT_EZNPS
31struct eznps_dp {
32 unsigned int eflags;
33 unsigned int gpa1;
34};
35#endif
36
37/* Arch specific stuff which needs to be saved per task.
38 * However these items are not so important so as to earn a place in
39 * struct thread_info
40 */
41struct thread_struct {
42 unsigned long ksp; /* kernel mode stack pointer */
43 unsigned long callee_reg; /* pointer to callee regs */
44 unsigned long fault_address; /* dbls as brkpt holder as well */
45#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
46 struct arc_fpu fpu;
47#endif
48#ifdef CONFIG_ARC_PLAT_EZNPS
49 struct eznps_dp dp;
50#endif
51};
52
53#define INIT_THREAD { \
54 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
55}
56
57/* Forward declaration, a strange C thing */
58struct task_struct;
59
60#define task_pt_regs(p) \
61 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
62
63/* Free all resources held by a thread */
64#define release_thread(thread) do { } while (0)
65
66/*
67 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
68 * get optimised away by gcc
69 */
70#ifndef CONFIG_EZNPS_MTM_EXT
71
72#define cpu_relax() barrier()
73
74#else
75
76#define cpu_relax() \
77 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
78
79#endif
80
81#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
82#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
83
84/*
85 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
86 * Look in process.c for details of kernel stack layout
87 */
88#define TSK_K_ESP(tsk) (tsk->thread.ksp)
89
90#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
91 sizeof(struct callee_regs) + off)))
92
93#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
94#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
95
96extern void start_thread(struct pt_regs * regs, unsigned long pc,
97 unsigned long usp);
98
99extern unsigned int get_wchan(struct task_struct *p);
100
101#endif /* !__ASSEMBLY__ */
102
103/*
104 * Default System Memory Map on ARC
105 *
106 * ---------------------------- (lower 2G, Translated) -------------------------
107 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
108 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
109 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
110 *
111 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
112 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
113 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
114 * -----------------------------------------------------------------------------
115 */
116
117#define TASK_SIZE 0x60000000
118
119#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
120
121/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
122#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
123
124#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
125
126#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
127
128#ifdef CONFIG_ARC_PLAT_EZNPS
129/* NPS architecture defines special window of 129M in user address space for
130 * special memory areas, when accessing this window the MMU do not use TLB.
131 * Instead MMU direct the access to:
132 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
133 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
134 *
135 * CMEM - is the fastest memory we got and its size is 16K.
136 * FMT - is used to map either to internal/external memory.
137 * Internal memory is the second fast memory and its size is 16M
138 * External memory is the biggest memory (16G) and also the slowest.
139 *
140 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
141 */
142#define STACK_TOP 0x57e00000
143#else
144#define STACK_TOP TASK_SIZE
145#endif
146
147#define STACK_TOP_MAX STACK_TOP
148
149/* This decides where the kernel will search for a free chunk of vm
150 * space during mmap's.
151 */
152#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
153
154#endif /* __ASM_ARC_PROCESSOR_H */