1/* SPDX-License-Identifier: GPL-2.0 */
 
 2
 3#ifndef __ASM_CSKY_PROCESSOR_H
 4#define __ASM_CSKY_PROCESSOR_H
 5
 6#include <linux/bitops.h>
 7#include <linux/cache.h>
 8#include <asm/ptrace.h>
 9#include <asm/current.h>
 
10#include <abi/reg_ops.h>
11#include <abi/regdef.h>
12#include <abi/switch_context.h>
13#ifdef CONFIG_CPU_HAS_FPU
14#include <abi/fpu.h>
15#endif
16
17struct cpuinfo_csky {
18	unsigned long asid_cache;
19} __aligned(SMP_CACHE_BYTES);
20
21extern struct cpuinfo_csky cpu_data[];
22
23/*
24 * User space process size: 2GB. This is hardcoded into a few places,
25 * so don't change it unless you know what you are doing.  TASK_SIZE
26 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
27 * implementations will "only" be able to use 1TB ...
28 */
29#define TASK_SIZE	(PAGE_OFFSET - (PAGE_SIZE * 8))
30
31#ifdef __KERNEL__
32#define STACK_TOP       TASK_SIZE
33#define STACK_TOP_MAX   STACK_TOP
34#endif
35
36/* This decides where the kernel will search for a free chunk of vm
37 * space during mmap's.
38 */
39#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
40
41struct thread_struct {
42	unsigned long  sp;        /* kernel stack pointer */
43	unsigned long  trap_no;   /* saved status register */
44
45	/* FPU regs */
46	struct user_fp __aligned(16) user_fp;
47};
48
49#define INIT_THREAD  { \
50	.sp = sizeof(init_stack) + (unsigned long) &init_stack, \
 
51}
52
53/*
54 * Do necessary setup to start up a newly executed thread.
55 *
56 * pass the data segment into user programs if it exists,
57 * it can't hurt anything as far as I can tell
58 */
59#define start_thread(_regs, _pc, _usp)					\
60do {									\
 
61	(_regs)->pc = (_pc);						\
62	(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */	\
63	(_regs)->regs[2] = 0;						\
64	(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */		\
65	(_regs)->sr &= ~PS_S;						\
66	(_regs)->usp = (_usp);						\
67} while (0)
68
69/* Forward declaration, a strange C thing */
70struct task_struct;
71
 
 
 
 
 
72/* Prepare to copy thread state - unlazy all lazy status */
73#define prepare_to_copy(tsk)    do { } while (0)
74
75extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
76
77unsigned long __get_wchan(struct task_struct *p);
 
 
 
 
 
 
78
79#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
80#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->usp)
81
82#define task_pt_regs(p) \
83	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
84
85#define cpu_relax() barrier()
86
87register unsigned long current_stack_pointer __asm__("sp");
88
89#endif /* __ASM_CSKY_PROCESSOR_H */

  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#include <abi/switch_context.h>
 15#ifdef CONFIG_CPU_HAS_FPU
 16#include <abi/fpu.h>
 17#endif
 18
 19struct cpuinfo_csky {
 20	unsigned long asid_cache;
 21} __aligned(SMP_CACHE_BYTES);
 22
 23extern struct cpuinfo_csky cpu_data[];
 24
 25/*
 26 * User space process size: 2GB. This is hardcoded into a few places,
 27 * so don't change it unless you know what you are doing.  TASK_SIZE
 28 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
 29 * implementations will "only" be able to use 1TB ...
 30 */
 31#define TASK_SIZE       0x7fff8000UL
 32
 33#ifdef __KERNEL__
 34#define STACK_TOP       TASK_SIZE
 35#define STACK_TOP_MAX   STACK_TOP
 36#endif
 37
 38/* This decides where the kernel will search for a free chunk of vm
 39 * space during mmap's.
 40 */
 41#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
 42
 43struct thread_struct {
 44	unsigned long  ksp;       /* kernel stack pointer */
 45	unsigned long  sr;        /* saved status register */
 46
 47	/* FPU regs */
 48	struct user_fp __aligned(16) user_fp;
 49};
 50
 51#define INIT_THREAD  { \
 52	.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
 53	.sr = DEFAULT_PSR_VALUE, \
 54}
 55
 56/*
 57 * Do necessary setup to start up a newly executed thread.
 58 *
 59 * pass the data segment into user programs if it exists,
 60 * it can't hurt anything as far as I can tell
 61 */
 62#define start_thread(_regs, _pc, _usp)					\
 63do {									\
 64	set_fs(USER_DS); /* reads from user space */			\
 65	(_regs)->pc = (_pc);						\
 66	(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */	\
 67	(_regs)->regs[2] = 0;						\
 68	(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */		\
 69	(_regs)->sr &= ~PS_S;						\
 70	(_regs)->usp = (_usp);						\
 71} while (0)
 72
 73/* Forward declaration, a strange C thing */
 74struct task_struct;
 75
 76/* Free all resources held by a thread. */
 77static inline void release_thread(struct task_struct *dead_task)
 78{
 79}
 80
 81/* Prepare to copy thread state - unlazy all lazy status */
 82#define prepare_to_copy(tsk)    do { } while (0)
 83
 84extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 85
 86#define copy_segments(tsk, mm)		do { } while (0)
 87#define release_segments(mm)		do { } while (0)
 88#define forget_segments()		do { } while (0)
 89
 90extern unsigned long thread_saved_pc(struct task_struct *tsk);
 91
 92unsigned long get_wchan(struct task_struct *p);
 93
 94#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
 95#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->usp)
 96
 97#define task_pt_regs(p) \
 98	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
 99
100#define cpu_relax() barrier()
 
 
101
102#endif /* __ASM_CSKY_PROCESSOR_H */