[mirror_ubuntu-jammy-kernel.git] / arch / riscv / include / asm / processor.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_PROCESSOR_H
#define _ASM_RISCV_PROCESSOR_H

#include <linux/const.h>

#include <vdso/processor.h>

#include <asm/ptrace.h>

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)

#define STACK_TOP		TASK_SIZE
#define STACK_TOP_MAX		STACK_TOP
#define STACK_ALIGN		16

#ifndef __ASSEMBLY__

struct task_struct;
struct pt_regs;

/* CPU-specific state of a task */
struct thread_struct {
	/* Callee-saved registers */
	unsigned long ra;
	unsigned long sp;	/* Kernel mode stack */
	unsigned long s[12];	/* s[0]: frame pointer */
	struct __riscv_d_ext_state fstate;
	unsigned long bad_cause;
};

#define INIT_THREAD {					\
	.sp = sizeof(init_stack) + (long)&init_stack,	\
}

#define task_pt_regs(tsk)						\
	((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE		\
			    - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))

#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->epc)
#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->sp)


/* Do necessary setup to start up a newly executed thread. */
extern void start_thread(struct pt_regs *regs,
			unsigned long pc, unsigned long sp);

/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}

extern unsigned long get_wchan(struct task_struct *p);


static inline void wait_for_interrupt(void)
{
	__asm__ __volatile__ ("wfi");
}

struct device_node;
int riscv_of_processor_hartid(struct device_node *node);
int riscv_of_parent_hartid(struct device_node *node);

extern void riscv_fill_hwcap(void);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);

#endif /* __ASSEMBLY__ */

#endif /* _ASM_RISCV_PROCESSOR_H */
Commit	Line	Data
50acfb2b	1	/* SPDX-License-Identifier: GPL-2.0-only */
7db91e57 PD	2	/*
7db91e57 PD	3	* Copyright (C) 2012 Regents of the University of California
7db91e57 PD	4	*/
	5
	6	#ifndef _ASM_RISCV_PROCESSOR_H
	7	#define _ASM_RISCV_PROCESSOR_H
	8
	9	#include <linux/const.h>
	10
ad5d1122 VC	11	#include <vdso/processor.h>
ad5d1122 VC	12
7db91e57 PD	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	*/
ae662eec	19	#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
7db91e57 PD	20
	21	#define STACK_TOP TASK_SIZE
	22	#define STACK_TOP_MAX STACK_TOP
	23	#define STACK_ALIGN 16
	24
	25	#ifndef __ASSEMBLY__
	26
	27	struct task_struct;
	28	struct pt_regs;
	29
7db91e57 PD	30	/* CPU-specific state of a task */
	31	struct 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;
74784081	37	unsigned long bad_cause;
7db91e57 PD	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
a4c3733d	48	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
7db91e57 PD	49	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
	50
	51
	52	/* Do necessary setup to start up a newly executed thread. */
	53	extern void start_thread(struct pt_regs *regs,
	54	unsigned long pc, unsigned long sp);
	55
	56	/* Free all resources held by a thread. */
	57	static inline void release_thread(struct task_struct *dead_task)
	58	{
	59	}
	60
	61	extern unsigned long get_wchan(struct task_struct *p);
	62
	63
7db91e57 PD	64	static inline void wait_for_interrupt(void)
	65	{
	66	__asm__ __volatile__ ("wfi");
	67	}
	68
	69	struct device_node;
b2f8cfa7	70	int riscv_of_processor_hartid(struct device_node *node);
d175d699	71	int riscv_of_parent_hartid(struct device_node *node);
7db91e57 PD	72
7db91e57 PD	73	extern void riscv_fill_hwcap(void);
0d7588ab	74	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
7db91e57 PD	75
	76	#endif /* __ASSEMBLY__ */
	77
	78	#endif /* _ASM_RISCV_PROCESSOR_H */