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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
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 */
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * vineetg: March 2009
9 * -Implemented task_pt_regs( )
10 *
11 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
12 */
13
14#ifndef __ASM_ARC_PROCESSOR_H
15#define __ASM_ARC_PROCESSOR_H
16
17#ifdef __KERNEL__
18
19#ifndef __ASSEMBLY__
20
21#include <asm/arcregs.h> /* for STATUS_E1_MASK et all */
22#include <asm/ptrace.h>
23
24/* Arch specific stuff which needs to be saved per task.
25 * However these items are not so important so as to earn a place in
26 * struct thread_info
27 */
28struct thread_struct {
29 unsigned long ksp; /* kernel mode stack pointer */
30 unsigned long callee_reg; /* pointer to callee regs */
31 unsigned long fault_address; /* dbls as brkpt holder as well */
32#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
33 struct arc_fpu fpu;
34#endif
35};
36
37#define INIT_THREAD { \
38 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
39}
40
41/* Forward declaration, a strange C thing */
42struct task_struct;
43
44/*
45 * Return saved PC of a blocked thread.
46 */
47unsigned long thread_saved_pc(struct task_struct *t);
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/* Prepare to copy thread state - unlazy all lazy status */
56#define prepare_to_copy(tsk) do { } while (0)
57
58/*
59 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
60 * get optimised away by gcc
61 */
62#ifdef CONFIG_SMP
63#define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
64#else
65#define cpu_relax() do { } while (0)
66#endif
67
68#define copy_segments(tsk, mm) do { } while (0)
69#define release_segments(mm) do { } while (0)
70
71#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
72
73/*
74 * Where abouts 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 KSTK_ESP(tsk) (tsk->thread.ksp)
78
79#define KSTK_REG(tsk, off) (*((unsigned int *)(KSTK_ESP(tsk) + \
80 sizeof(struct callee_regs) + off)))
81
82#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)
83#define KSTK_FP(tsk) KSTK_REG(tsk, 0)
84
85/*
86 * Do necessary setup to start up a newly executed thread.
87 *
88 * E1,E2 so that Interrupts are enabled in user mode
89 * L set, so Loop inhibited to begin with
90 * lp_start and lp_end seeded with bogus non-zero values so to easily catch
91 * the ARC700 sr to lp_start hardware bug
92 */
93#define start_thread(_regs, _pc, _usp) \
94do { \
95 set_fs(USER_DS); /* reads from user space */ \
96 (_regs)->ret = (_pc); \
97 /* Interrupts enabled in User Mode */ \
98 (_regs)->status32 = STATUS_U_MASK | STATUS_L_MASK \
99 | STATUS_E1_MASK | STATUS_E2_MASK; \
100 (_regs)->sp = (_usp); \
101 /* bogus seed values for debugging */ \
102 (_regs)->lp_start = 0x10; \
103 (_regs)->lp_end = 0x80; \
104} while (0)
105
106extern unsigned int get_wchan(struct task_struct *p);
107
108/*
109 * Default implementation of macro that returns current
110 * instruction pointer ("program counter").
111 * Should the PC register be read instead ? This macro does not seem to
112 * be used in many places so this wont be all that bad.
113 */
114#define current_text_addr() ({ __label__ _l; _l: &&_l; })
115
116#endif /* !__ASSEMBLY__ */
117
118/* Kernels Virtual memory area.
119 * Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a
120 * "kernel translated" region (like KSEG2 in MIPS). So we use a upper part
121 * of the translated bottom 2GB for kernel virtual memory and protect
122 * these pages from user accesses by disabling Ru, Eu and Wu.
123 */
124#define VMALLOC_SIZE (0x10000000) /* 256M */
125#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
126#define VMALLOC_END (PAGE_OFFSET)
127
128/* Most of the architectures seem to be keeping some kind of padding between
129 * userspace TASK_SIZE and PAGE_OFFSET. i.e TASK_SIZE != PAGE_OFFSET.
130 */
131#define USER_KERNEL_GUTTER 0x10000000
132
133/* User address space:
134 * On ARC700, CPU allows the entire lower half of 32 bit address space to be
135 * translated. Thus potentially 2G (0:0x7FFF_FFFF) could be User vaddr space.
136 * However we steal 256M for kernel addr (0x7000_0000:0x7FFF_FFFF) and another
137 * 256M (0x6000_0000:0x6FFF_FFFF) is gutter between user/kernel spaces
138 * Thus total User vaddr space is (0:0x5FFF_FFFF)
139 */
140#define TASK_SIZE (PAGE_OFFSET - VMALLOC_SIZE - USER_KERNEL_GUTTER)
141
142#define STACK_TOP TASK_SIZE
143#define STACK_TOP_MAX STACK_TOP
144
145/* This decides where the kernel will search for a free chunk of vm
146 * space during mmap's.
147 */
148#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
149
150#endif /* __KERNEL__ */
151
152#endif /* __ASM_ARC_PROCESSOR_H */