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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 callee_reg; /* pointer to callee regs */
26 unsigned long fault_address; /* dbls as brkpt holder as well */
27#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
28 struct dsp_callee_regs dsp;
29#endif
30#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
31 struct arc_fpu fpu;
32#endif
33};
34
35#define INIT_THREAD { }
36
37/* Forward declaration, a strange C thing */
38struct task_struct;
39
40#define task_pt_regs(p) \
41 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
42
43/*
44 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
45 * get optimised away by gcc
46 */
47#define cpu_relax() barrier()
48
49#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
50#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
51
52/*
53 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
54 * Look in process.c for details of kernel stack layout
55 */
56#define TSK_K_ESP(tsk) (task_thread_info(tsk)->ksp)
57
58#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
59 sizeof(struct callee_regs) + off)))
60
61#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
62#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
63
64extern void start_thread(struct pt_regs * regs, unsigned long pc,
65 unsigned long usp);
66
67extern unsigned int __get_wchan(struct task_struct *p);
68
69#endif /* !__ASSEMBLY__ */
70
71/*
72 * Default System Memory Map on ARC
73 *
74 * ---------------------------- (lower 2G, Translated) -------------------------
75 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
76 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
77 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
78 *
79 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
80 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
81 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
82 * -----------------------------------------------------------------------------
83 */
84
85#define TASK_SIZE 0x60000000
86
87#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
88
89/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
90#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PMD_SIZE * 4)
91
92#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
93
94#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
95
96#define STACK_TOP TASK_SIZE
97#define STACK_TOP_MAX STACK_TOP
98
99/* This decides where the kernel will search for a free chunk of vm
100 * space during mmap's.
101 */
102#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
103
104#endif /* __ASM_ARC_PROCESSOR_H */
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
18#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
27#ifdef CONFIG_ARC_PLAT_EZNPS
28struct eznps_dp {
29 unsigned int eflags;
30 unsigned int gpa1;
31};
32#endif
33
34/* 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 */
42#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
43 struct arc_fpu fpu;
44#endif
45#ifdef CONFIG_ARC_PLAT_EZNPS
46 struct eznps_dp dp;
47#endif
48};
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
57#define task_pt_regs(p) \
58 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
59
60/* Free all resources held by a thread */
61#define release_thread(thread) do { } while (0)
62
63/*
64 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
65 * get optimised away by gcc
66 */
67#ifndef CONFIG_EZNPS_MTM_EXT
68
69#define cpu_relax() barrier()
70
71#else
72
73#define cpu_relax() \
74 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
75
76#endif
77
78#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
79#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
80
81/*
82 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
83 * Look in process.c for details of kernel stack layout
84 */
85#define TSK_K_ESP(tsk) (tsk->thread.ksp)
86
87#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
88 sizeof(struct callee_regs) + off)))
89
90#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
91#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
92
93extern void start_thread(struct pt_regs * regs, unsigned long pc,
94 unsigned long usp);
95
96extern unsigned int get_wchan(struct task_struct *p);
97
98#endif /* !__ASSEMBLY__ */
99
100/*
101 * Default System Memory Map on ARC
102 *
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 * -----------------------------------------------------------------------------
112 */
113
114#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
121#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
122
123#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
124
125#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
141#define STACK_TOP TASK_SIZE
142#endif
143
144#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
151#endif /* __ASM_ARC_PROCESSOR_H */