Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#ifndef __ASM_CSKY_PROCESSOR_H
5#define __ASM_CSKY_PROCESSOR_H
6
7#include <linux/bitops.h>
8#include <asm/segment.h>
9#include <asm/ptrace.h>
10#include <asm/current.h>
11#include <asm/cache.h>
12#include <abi/reg_ops.h>
13#include <abi/regdef.h>
14#ifdef CONFIG_CPU_HAS_FPU
15#include <abi/fpu.h>
16#endif
17
18struct cpuinfo_csky {
19 unsigned long udelay_val;
20 unsigned long asid_cache;
21 /*
22 * Capability and feature descriptor structure for CSKY CPU
23 */
24 unsigned long options;
25 unsigned int processor_id[4];
26 unsigned int fpu_id;
27} __aligned(SMP_CACHE_BYTES);
28
29extern struct cpuinfo_csky cpu_data[];
30
31/*
32 * User space process size: 2GB. This is hardcoded into a few places,
33 * so don't change it unless you know what you are doing. TASK_SIZE
34 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
35 * implementations will "only" be able to use 1TB ...
36 */
37#define TASK_SIZE 0x7fff8000UL
38
39#ifdef __KERNEL__
40#define STACK_TOP TASK_SIZE
41#define STACK_TOP_MAX STACK_TOP
42#endif
43
44/* This decides where the kernel will search for a free chunk of vm
45 * space during mmap's.
46 */
47#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
48
49struct thread_struct {
50 unsigned long ksp; /* kernel stack pointer */
51 unsigned long sr; /* saved status register */
52 unsigned long esp0; /* points to SR of stack frame */
53 unsigned long hi;
54 unsigned long lo;
55
56 /* Other stuff associated with the thread. */
57 unsigned long address; /* Last user fault */
58 unsigned long error_code;
59
60 /* FPU regs */
61 struct user_fp __aligned(16) user_fp;
62};
63
64#define INIT_THREAD { \
65 .ksp = (unsigned long) init_thread_union.stack + THREAD_SIZE, \
66 .sr = DEFAULT_PSR_VALUE, \
67}
68
69/*
70 * Do necessary setup to start up a newly executed thread.
71 *
72 * pass the data segment into user programs if it exists,
73 * it can't hurt anything as far as I can tell
74 */
75#define start_thread(_regs, _pc, _usp) \
76do { \
77 set_fs(USER_DS); /* reads from user space */ \
78 (_regs)->pc = (_pc); \
79 (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \
80 (_regs)->regs[2] = 0; \
81 (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \
82 (_regs)->sr &= ~PS_S; \
83 (_regs)->usp = (_usp); \
84} while (0)
85
86/* Forward declaration, a strange C thing */
87struct task_struct;
88
89/* Free all resources held by a thread. */
90static inline void release_thread(struct task_struct *dead_task)
91{
92}
93
94/* Prepare to copy thread state - unlazy all lazy status */
95#define prepare_to_copy(tsk) do { } while (0)
96
97extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
98
99#define copy_segments(tsk, mm) do { } while (0)
100#define release_segments(mm) do { } while (0)
101#define forget_segments() do { } while (0)
102
103extern unsigned long thread_saved_pc(struct task_struct *tsk);
104
105unsigned long get_wchan(struct task_struct *p);
106
107#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
108#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp)
109
110#define task_pt_regs(p) \
111 ((struct pt_regs *)(THREAD_SIZE + p->stack) - 1)
112
113#define cpu_relax() barrier()
114
115#endif /* __ASM_CSKY_PROCESSOR_H */