Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 unsigned long bad_cause;
38};
39
40#define INIT_THREAD { \
41 .sp = sizeof(init_stack) + (long)&init_stack, \
42}
43
44#define task_pt_regs(tsk) \
45 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
46 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
47
48#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
49#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
50
51
52/* Do necessary setup to start up a newly executed thread. */
53extern void start_thread(struct pt_regs *regs,
54 unsigned long pc, unsigned long sp);
55
56/* Free all resources held by a thread. */
57static inline void release_thread(struct task_struct *dead_task)
58{
59}
60
61extern unsigned long get_wchan(struct task_struct *p);
62
63
64static inline void wait_for_interrupt(void)
65{
66 __asm__ __volatile__ ("wfi");
67}
68
69struct device_node;
70int riscv_of_processor_hartid(struct device_node *node);
71int riscv_of_parent_hartid(struct device_node *node);
72
73extern void riscv_fill_hwcap(void);
74extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
75
76#endif /* __ASSEMBLY__ */
77
78#endif /* _ASM_RISCV_PROCESSOR_H */