1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6#ifndef _ASM_RISCV_PROCESSOR_H
7#define _ASM_RISCV_PROCESSOR_H
8
9#include <linux/const.h>
10
11#include <vdso/processor.h>
12
13#include <asm/ptrace.h>
14
15/*
16 * This decides where the kernel will search for a free chunk of vm
17 * space during mmap's.
18 */
19#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)
20
21#define STACK_TOP		TASK_SIZE
22#define STACK_TOP_MAX		STACK_TOP
23#define STACK_ALIGN		16
24
25#ifndef __ASSEMBLY__
26
27struct task_struct;
28struct pt_regs;
29
30/* CPU-specific state of a task */
31struct thread_struct {
32	/* Callee-saved registers */
33	unsigned long ra;
34	unsigned long sp;	/* Kernel mode stack */
35	unsigned long s[12];	/* s[0]: frame pointer */
36	struct __riscv_d_ext_state fstate;
37};
38
39#define INIT_THREAD {					\
40	.sp = sizeof(init_stack) + (long)&init_stack,	\
41}
42
43#define task_pt_regs(tsk)						\
44	((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE		\
45			    - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
46
47#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->epc)
48#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->sp)
49
50
51/* Do necessary setup to start up a newly executed thread. */
52extern void start_thread(struct pt_regs *regs,
53			unsigned long pc, unsigned long sp);
54
55/* Free all resources held by a thread. */
56static inline void release_thread(struct task_struct *dead_task)
57{
58}
59
60extern unsigned long get_wchan(struct task_struct *p);
61
62
63static inline void wait_for_interrupt(void)
64{
65	__asm__ __volatile__ ("wfi");
66}
67
68struct device_node;
69int riscv_of_processor_hartid(struct device_node *node);
70int riscv_of_parent_hartid(struct device_node *node);
71
72extern void riscv_fill_hwcap(void);
73
74#endif /* __ASSEMBLY__ */
75
76#endif /* _ASM_RISCV_PROCESSOR_H */
77