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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001/* SPDX-License-Identifier: GPL-2.0-only */
Vineet Gupta3be80aa2013-01-18 15:12:17 +05302/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
Vineet Gupta3be80aa2013-01-18 15:12:17 +05305 * 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
Vineet Gupta3be80aa2013-01-18 15:12:17 +053014#ifndef __ASSEMBLY__
15
Vineet Gupta16f9afe2013-05-27 21:43:41 +053016#include <asm/ptrace.h>
Vineet Gupta3be80aa2013-01-18 15:12:17 +053017
Vineet Gupta52e9bae2014-09-27 12:53:41 +053018#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
19/* These DPFP regs need to be saved/restored across ctx-sw */
20struct arc_fpu {
21 struct {
22 unsigned int l, h;
23 } aux_dpfp[2];
24};
25#endif
26
Noam Camus5b2189a2017-06-15 11:43:59 +030027#ifdef CONFIG_ARC_PLAT_EZNPS
28struct eznps_dp {
29 unsigned int eflags;
30 unsigned int gpa1;
31};
32#endif
33
Vineet Gupta3be80aa2013-01-18 15:12:17 +053034/* Arch specific stuff which needs to be saved per task.
35 * However these items are not so important so as to earn a place in
36 * struct thread_info
37 */
38struct thread_struct {
39 unsigned long ksp; /* kernel mode stack pointer */
40 unsigned long callee_reg; /* pointer to callee regs */
41 unsigned long fault_address; /* dbls as brkpt holder as well */
Vineet Guptabf90e1e2013-01-18 15:12:18 +053042#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
43 struct arc_fpu fpu;
44#endif
Noam Camus5b2189a2017-06-15 11:43:59 +030045#ifdef CONFIG_ARC_PLAT_EZNPS
46 struct eznps_dp dp;
47#endif
Vineet Gupta3be80aa2013-01-18 15:12:17 +053048};
49
50#define INIT_THREAD { \
51 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
52}
53
54/* Forward declaration, a strange C thing */
55struct task_struct;
56
Vineet Gupta3be80aa2013-01-18 15:12:17 +053057#define task_pt_regs(p) \
Vineet Gupta283237a2013-05-28 09:34:45 +053058 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
Vineet Gupta3be80aa2013-01-18 15:12:17 +053059
Vineet Gupta2ab402d2014-04-18 12:19:59 +053060/* Free all resources held by a thread */
Vineet Gupta3be80aa2013-01-18 15:12:17 +053061#define release_thread(thread) do { } while (0)
62
Vineet Gupta41195d22013-01-18 15:12:23 +053063/*
64 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
65 * get optimised away by gcc
66 */
Tal Zilcer46c3e6b2015-03-09 16:58:39 +020067#ifndef CONFIG_EZNPS_MTM_EXT
Vineet Gupta3be80aa2013-01-18 15:12:17 +053068
Tal Zilcer46c3e6b2015-03-09 16:58:39 +020069#define cpu_relax() barrier()
Tal Zilcer46c3e6b2015-03-09 16:58:39 +020070
71#else
72
73#define cpu_relax() \
74 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
75
Tal Zilcer46c3e6b2015-03-09 16:58:39 +020076#endif
Davidlohr Bueso3a6bfbc2014-06-29 15:09:33 -070077
Vineet Gupta3be80aa2013-01-18 15:12:17 +053078#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
Vineet Gupta13648b02015-02-27 10:39:17 +053079#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
Vineet Gupta3be80aa2013-01-18 15:12:17 +053080
81/*
Andrea Gelmini25474762016-05-21 13:45:35 +020082 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
Vineet Gupta16f9afe2013-05-27 21:43:41 +053083 * Look in process.c for details of kernel stack layout
Vineet Gupta3be80aa2013-01-18 15:12:17 +053084 */
Vineet Gupta13648b02015-02-27 10:39:17 +053085#define TSK_K_ESP(tsk) (tsk->thread.ksp)
Vineet Gupta16f9afe2013-05-27 21:43:41 +053086
Vineet Gupta1269f4d2015-04-25 10:40:52 +053087#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
Vineet Gupta16f9afe2013-05-27 21:43:41 +053088 sizeof(struct callee_regs) + off)))
89
Vineet Gupta13648b02015-02-27 10:39:17 +053090#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
91#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
Vineet Gupta3be80aa2013-01-18 15:12:17 +053092
Vineet Gupta2ab402d2014-04-18 12:19:59 +053093extern void start_thread(struct pt_regs * regs, unsigned long pc,
94 unsigned long usp);
Vineet Gupta3be80aa2013-01-18 15:12:17 +053095
96extern unsigned int get_wchan(struct task_struct *p);
97
Vineet Gupta3be80aa2013-01-18 15:12:17 +053098#endif /* !__ASSEMBLY__ */
99
Vineet Gupta4db27dc2015-03-05 14:46:20 +0530100/*
Noam Camus15ca68a2014-09-07 22:52:33 +0300101 * Default System Memory Map on ARC
Vineet Gupta4db27dc2015-03-05 14:46:20 +0530102 *
103 * ---------------------------- (lower 2G, Translated) -------------------------
104 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
105 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
106 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
107 *
108 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
109 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
110 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
111 * -----------------------------------------------------------------------------
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530112 */
Vineet Gupta45890f62015-03-09 18:53:49 +0530113
Noam Camus15ca68a2014-09-07 22:52:33 +0300114#define TASK_SIZE 0x60000000
115
116#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
117
118/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
119#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
120
Vineet Gupta4db27dc2015-03-05 14:46:20 +0530121#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530122
Noam Camus15ca68a2014-09-07 22:52:33 +0300123#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530124
Noam Camus8bcf2c42015-12-06 15:40:55 +0200125#ifdef CONFIG_ARC_PLAT_EZNPS
126/* NPS architecture defines special window of 129M in user address space for
127 * special memory areas, when accessing this window the MMU do not use TLB.
128 * Instead MMU direct the access to:
129 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
130 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
131 *
132 * CMEM - is the fastest memory we got and its size is 16K.
133 * FMT - is used to map either to internal/external memory.
134 * Internal memory is the second fast memory and its size is 16M
135 * External memory is the biggest memory (16G) and also the slowest.
136 *
137 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
138 */
139#define STACK_TOP 0x57e00000
140#else
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530141#define STACK_TOP TASK_SIZE
Noam Camus8bcf2c42015-12-06 15:40:55 +0200142#endif
143
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530144#define STACK_TOP_MAX STACK_TOP
145
146/* This decides where the kernel will search for a free chunk of vm
147 * space during mmap's.
148 */
149#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
150
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530151#endif /* __ASM_ARC_PROCESSOR_H */