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#ifdef CONFIG_64BIT
23#define STACK_TOP_MAX TASK_SIZE_64
24#else
25#define STACK_TOP_MAX TASK_SIZE
26#endif
27#define STACK_ALIGN 16
28
29#ifndef __ASSEMBLY__
30
31struct task_struct;
32struct pt_regs;
33
34/* CPU-specific state of a task */
35struct thread_struct {
36 /* Callee-saved registers */
37 unsigned long ra;
38 unsigned long sp; /* Kernel mode stack */
39 unsigned long s[12]; /* s[0]: frame pointer */
40 struct __riscv_d_ext_state fstate;
41 unsigned long bad_cause;
42};
43
44/* Whitelist the fstate from the task_struct for hardened usercopy */
45static inline void arch_thread_struct_whitelist(unsigned long *offset,
46 unsigned long *size)
47{
48 *offset = offsetof(struct thread_struct, fstate);
49 *size = sizeof_field(struct thread_struct, fstate);
50}
51
52#define INIT_THREAD { \
53 .sp = sizeof(init_stack) + (long)&init_stack, \
54}
55
56#define task_pt_regs(tsk) \
57 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
58 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
59
60#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
61#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
62
63
64/* Do necessary setup to start up a newly executed thread. */
65extern void start_thread(struct pt_regs *regs,
66 unsigned long pc, unsigned long sp);
67
68extern unsigned long __get_wchan(struct task_struct *p);
69
70
71static inline void wait_for_interrupt(void)
72{
73 __asm__ __volatile__ ("wfi");
74}
75
76struct device_node;
77int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
78int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
79
80extern void riscv_fill_hwcap(void);
81extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
82
83#endif /* __ASSEMBLY__ */
84
85#endif /* _ASM_RISCV_PROCESSOR_H */