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#ifdef CONFIG_ARC_PLAT_EZNPS
21struct eznps_dp {
22 unsigned int eflags;
23 unsigned int gpa1;
24};
25#endif
26
27/* Arch specific stuff which needs to be saved per task.
28 * However these items are not so important so as to earn a place in
29 * struct thread_info
30 */
31struct thread_struct {
32 unsigned long ksp; /* kernel mode stack pointer */
33 unsigned long callee_reg; /* pointer to callee regs */
34 unsigned long fault_address; /* dbls as brkpt holder as well */
35#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
36 struct dsp_callee_regs dsp;
37#endif
38#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
39 struct arc_fpu fpu;
40#endif
41#ifdef CONFIG_ARC_PLAT_EZNPS
42 struct eznps_dp dp;
43#endif
44};
45
46#define INIT_THREAD { \
47 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
48}
49
50/* Forward declaration, a strange C thing */
51struct task_struct;
52
53#define task_pt_regs(p) \
54 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
55
56/* Free all resources held by a thread */
57#define release_thread(thread) do { } while (0)
58
59/*
60 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
61 * get optimised away by gcc
62 */
63#ifndef CONFIG_EZNPS_MTM_EXT
64
65#define cpu_relax() barrier()
66
67#else
68
69#define cpu_relax() \
70 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
71
72#endif
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#endif /* !__ASSEMBLY__ */
95
96/*
97 * Default System Memory Map on ARC
98 *
99 * ---------------------------- (lower 2G, Translated) -------------------------
100 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
101 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
102 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
103 *
104 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
105 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
106 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
107 * -----------------------------------------------------------------------------
108 */
109
110#define TASK_SIZE 0x60000000
111
112#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
113
114/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
115#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
116
117#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
118
119#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
120
121#ifdef CONFIG_ARC_PLAT_EZNPS
122/* NPS architecture defines special window of 129M in user address space for
123 * special memory areas, when accessing this window the MMU do not use TLB.
124 * Instead MMU direct the access to:
125 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
126 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
127 *
128 * CMEM - is the fastest memory we got and its size is 16K.
129 * FMT - is used to map either to internal/external memory.
130 * Internal memory is the second fast memory and its size is 16M
131 * External memory is the biggest memory (16G) and also the slowest.
132 *
133 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
134 */
135#define STACK_TOP 0x57e00000
136#else
137#define STACK_TOP TASK_SIZE
138#endif
139
140#define STACK_TOP_MAX STACK_TOP
141
142/* This decides where the kernel will search for a free chunk of vm
143 * space during mmap's.
144 */
145#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
146
147#endif /* __ASM_ARC_PROCESSOR_H */