Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * vineetg: March 2009
6 * -Implemented task_pt_regs( )
7 *
8 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
9 */
10
11#ifndef __ASM_ARC_PROCESSOR_H
12#define __ASM_ARC_PROCESSOR_H
13
14#ifndef __ASSEMBLY__
15
16#include <asm/ptrace.h>
17#include <asm/dsp.h>
18#include <asm/fpu.h>
19
20/* Arch specific stuff which needs to be saved per task.
21 * However these items are not so important so as to earn a place in
22 * struct thread_info
23 */
24struct thread_struct {
25 unsigned long ksp; /* kernel mode stack pointer */
26 unsigned long callee_reg; /* pointer to callee regs */
27 unsigned long fault_address; /* dbls as brkpt holder as well */
28#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
29 struct dsp_callee_regs dsp;
30#endif
31#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
32 struct arc_fpu fpu;
33#endif
34};
35
36#define INIT_THREAD { \
37 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
38}
39
40/* Forward declaration, a strange C thing */
41struct task_struct;
42
43#define task_pt_regs(p) \
44 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
45
46/*
47 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
48 * get optimised away by gcc
49 */
50#define cpu_relax() barrier()
51
52#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
53#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
54
55/*
56 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
57 * Look in process.c for details of kernel stack layout
58 */
59#define TSK_K_ESP(tsk) (tsk->thread.ksp)
60
61#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
62 sizeof(struct callee_regs) + off)))
63
64#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
65#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
66
67extern void start_thread(struct pt_regs * regs, unsigned long pc,
68 unsigned long usp);
69
70extern unsigned int __get_wchan(struct task_struct *p);
71
72#endif /* !__ASSEMBLY__ */
73
74/*
75 * Default System Memory Map on ARC
76 *
77 * ---------------------------- (lower 2G, Translated) -------------------------
78 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
79 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
80 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
81 *
82 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
83 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
84 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
85 * -----------------------------------------------------------------------------
86 */
87
88#define TASK_SIZE 0x60000000
89
90#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
91
92/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
93#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PMD_SIZE * 4)
94
95#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
96
97#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
98
99#define STACK_TOP TASK_SIZE
100#define STACK_TOP_MAX STACK_TOP
101
102/* This decides where the kernel will search for a free chunk of vm
103 * space during mmap's.
104 */
105#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
106
107#endif /* __ASM_ARC_PROCESSOR_H */