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/* Whitelist the fstate from the task_struct for hardened usercopy */
41static inline void arch_thread_struct_whitelist(unsigned long *offset,
42 unsigned long *size)
43{
44 *offset = offsetof(struct thread_struct, fstate);
45 *size = sizeof_field(struct thread_struct, fstate);
46}
47
48#define INIT_THREAD { \
49 .sp = sizeof(init_stack) + (long)&init_stack, \
50}
51
52#define task_pt_regs(tsk) \
53 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
54 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
55
56#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
57#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
58
59
60/* Do necessary setup to start up a newly executed thread. */
61extern void start_thread(struct pt_regs *regs,
62 unsigned long pc, unsigned long sp);
63
64/* Free all resources held by a thread. */
65static inline void release_thread(struct task_struct *dead_task)
66{
67}
68
69extern unsigned long get_wchan(struct task_struct *p);
70
71
72static inline void wait_for_interrupt(void)
73{
74 __asm__ __volatile__ ("wfi");
75}
76
77struct device_node;
78int riscv_of_processor_hartid(struct device_node *node);
79int riscv_of_parent_hartid(struct device_node *node);
80
81extern void riscv_fill_hwcap(void);
82extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
83
84#endif /* __ASSEMBLY__ */
85
86#endif /* _ASM_RISCV_PROCESSOR_H */