1/* SPDX-License-Identifier: GPL-2.0 */
2// Copyright (C) 2005-2017 Andes Technology Corporation
3
4#ifndef __ASM_NDS32_PROCESSOR_H
5#define __ASM_NDS32_PROCESSOR_H
6
7#ifdef __KERNEL__
8
9#include <asm/ptrace.h>
10#include <asm/types.h>
11#include <asm/sigcontext.h>
12
13#define KERNEL_STACK_SIZE	PAGE_SIZE
14#define STACK_TOP	TASK_SIZE
15#define STACK_TOP_MAX   TASK_SIZE
16
17struct cpu_context {
18	unsigned long r6;
19	unsigned long r7;
20	unsigned long r8;
21	unsigned long r9;
22	unsigned long r10;
23	unsigned long r11;
24	unsigned long r12;
25	unsigned long r13;
26	unsigned long r14;
27	unsigned long fp;
28	unsigned long pc;
29	unsigned long sp;
30};
31
32struct thread_struct {
33	struct cpu_context cpu_context;	/* cpu context */
34	/* fault info     */
35	unsigned long address;
36	unsigned long trap_no;
37	unsigned long error_code;
38
39	struct fpu_struct fpu;
40};
41
42#define INIT_THREAD  {	}
43
44#ifdef __NDS32_EB__
45#define PSW_DE	PSW_mskBE
46#else
47#define PSW_DE	0x0
48#endif
49
50#ifdef CONFIG_WBNA
51#define PSW_valWBNA	PSW_mskWBNA
52#else
53#define PSW_valWBNA	0x0
54#endif
55
56#ifdef CONFIG_HWZOL
57#define	PSW_valINIT (PSW_CPL_ANY | PSW_mskAEN | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
58#else
59#define	PSW_valINIT (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
60#endif
61
62#define start_thread(regs,pc,stack)			\
63({							\
64	memzero(regs, sizeof(struct pt_regs));		\
65	forget_syscall(regs);				\
66	regs->ipsw = PSW_valINIT;			\
67	regs->ir0 = (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_SYSTEM | PSW_INTL_1);	\
68	regs->ipc = pc;					\
69	regs->sp = stack;				\
70})
71
72/* Forward declaration, a strange C thing */
73struct task_struct;
74
75/* Free all resources held by a thread. */
76#define release_thread(thread) do { } while(0)
77#if IS_ENABLED(CONFIG_FPU)
78#if !IS_ENABLED(CONFIG_UNLAZU_FPU)
79extern struct task_struct *last_task_used_math;
80#endif
81#endif
82
83/* Prepare to copy thread state - unlazy all lazy status */
84#define prepare_to_copy(tsk)	do { } while (0)
85
86unsigned long get_wchan(struct task_struct *p);
87
88#define cpu_relax()			barrier()
89
90#define task_pt_regs(task) \
91	((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE \
92		- 8) - 1)
93
94/*
95 * Create a new kernel thread
96 */
97extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
98
99#define KSTK_EIP(tsk)	instruction_pointer(task_pt_regs(tsk))
100#define KSTK_ESP(tsk)	user_stack_pointer(task_pt_regs(tsk))
101
102#endif
103
104#endif /* __ASM_NDS32_PROCESSOR_H */
105