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/fpu.h>
18
19#ifdef CONFIG_ARC_PLAT_EZNPS
20struct eznps_dp {
21 unsigned int eflags;
22 unsigned int gpa1;
23};
24#endif
25
26/* Arch specific stuff which needs to be saved per task.
27 * However these items are not so important so as to earn a place in
28 * struct thread_info
29 */
30struct thread_struct {
31 unsigned long ksp; /* kernel mode stack pointer */
32 unsigned long callee_reg; /* pointer to callee regs */
33 unsigned long fault_address; /* dbls as brkpt holder as well */
34#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
35 struct arc_fpu fpu;
36#endif
37#ifdef CONFIG_ARC_PLAT_EZNPS
38 struct eznps_dp dp;
39#endif
40};
41
42#define INIT_THREAD { \
43 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
44}
45
46/* Forward declaration, a strange C thing */
47struct task_struct;
48
49#define task_pt_regs(p) \
50 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
51
52/* Free all resources held by a thread */
53#define release_thread(thread) do { } while (0)
54
55/*
56 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
57 * get optimised away by gcc
58 */
59#ifndef CONFIG_EZNPS_MTM_EXT
60
61#define cpu_relax() barrier()
62
63#else
64
65#define cpu_relax() \
66 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
67
68#endif
69
70#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
71#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
72
73/*
74 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
75 * Look in process.c for details of kernel stack layout
76 */
77#define TSK_K_ESP(tsk) (tsk->thread.ksp)
78
79#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
80 sizeof(struct callee_regs) + off)))
81
82#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
83#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
84
85extern void start_thread(struct pt_regs * regs, unsigned long pc,
86 unsigned long usp);
87
88extern unsigned int get_wchan(struct task_struct *p);
89
90#endif /* !__ASSEMBLY__ */
91
92/*
93 * Default System Memory Map on ARC
94 *
95 * ---------------------------- (lower 2G, Translated) -------------------------
96 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
97 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
98 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
99 *
100 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
101 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
102 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
103 * -----------------------------------------------------------------------------
104 */
105
106#define TASK_SIZE 0x60000000
107
108#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
109
110/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
111#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
112
113#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
114
115#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
116
117#ifdef CONFIG_ARC_PLAT_EZNPS
118/* NPS architecture defines special window of 129M in user address space for
119 * special memory areas, when accessing this window the MMU do not use TLB.
120 * Instead MMU direct the access to:
121 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
122 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
123 *
124 * CMEM - is the fastest memory we got and its size is 16K.
125 * FMT - is used to map either to internal/external memory.
126 * Internal memory is the second fast memory and its size is 16M
127 * External memory is the biggest memory (16G) and also the slowest.
128 *
129 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
130 */
131#define STACK_TOP 0x57e00000
132#else
133#define STACK_TOP TASK_SIZE
134#endif
135
136#define STACK_TOP_MAX STACK_TOP
137
138/* This decides where the kernel will search for a free chunk of vm
139 * space during mmap's.
140 */
141#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
142
143#endif /* __ASM_ARC_PROCESSOR_H */