[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 <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;
};

#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)->sepc)
#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 cpu_relax(void)
{
#ifdef __riscv_muldiv
	int dummy;
	/* In lieu of a halt instruction, induce a long-latency stall. */
	__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
#endif
	barrier();
}

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

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

extern void riscv_fill_hwcap(void);

#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
	11	#include <asm/ptrace.h>
	12
	13	/*
	14	* This decides where the kernel will search for a free chunk of vm
	15	* space during mmap's.
	16	*/
ae662eec	17	#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
7db91e57 PD	18
	19	#define STACK_TOP TASK_SIZE
	20	#define STACK_TOP_MAX STACK_TOP
	21	#define STACK_ALIGN 16
	22
	23	#ifndef __ASSEMBLY__
	24
	25	struct task_struct;
	26	struct pt_regs;
	27
7db91e57 PD	28	/* CPU-specific state of a task */
	29	struct thread_struct {
	30	/* Callee-saved registers */
	31	unsigned long ra;
	32	unsigned long sp; /* Kernel mode stack */
	33	unsigned long s[12]; /* s[0]: frame pointer */
	34	struct __riscv_d_ext_state fstate;
	35	};
	36
	37	#define INIT_THREAD { \
	38	.sp = sizeof(init_stack) + (long)&init_stack, \
	39	}
	40
	41	#define task_pt_regs(tsk) \
	42	((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
	43	- ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
	44
	45	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->sepc)
	46	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
	47
	48
	49	/* Do necessary setup to start up a newly executed thread. */
	50	extern void start_thread(struct pt_regs *regs,
	51	unsigned long pc, unsigned long sp);
	52
	53	/* Free all resources held by a thread. */
	54	static inline void release_thread(struct task_struct *dead_task)
	55	{
	56	}
	57
	58	extern unsigned long get_wchan(struct task_struct *p);
	59
	60
	61	static inline void cpu_relax(void)
	62	{
	63	#ifdef __riscv_muldiv
	64	int dummy;
	65	/* In lieu of a halt instruction, induce a long-latency stall. */
	66	__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
	67	#endif
	68	barrier();
	69	}
	70
	71	static inline void wait_for_interrupt(void)
	72	{
	73	__asm__ __volatile__ ("wfi");
	74	}
	75
	76	struct device_node;
b2f8cfa7	77	int riscv_of_processor_hartid(struct device_node *node);
7db91e57 PD	78
	79	extern void riscv_fill_hwcap(void);
	80
	81	#endif /* __ASSEMBLY__ */
	82
	83	#endif /* _ASM_RISCV_PROCESSOR_H */