[mirror_ubuntu-jammy-kernel.git] / arch / m68k / include / asm / processor.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/asm-m68k/processor.h
 *
 * Copyright (C) 1995 Hamish Macdonald
 */

#ifndef __ASM_M68K_PROCESSOR_H
#define __ASM_M68K_PROCESSOR_H

#include <linux/thread_info.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>

static inline unsigned long rdusp(void)
{
#ifdef CONFIG_COLDFIRE_SW_A7
	extern unsigned int sw_usp;
	return sw_usp;
#else
	register unsigned long usp __asm__("a0");
	/* move %usp,%a0 */
	__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
	return usp;
#endif
}

static inline void wrusp(unsigned long usp)
{
#ifdef CONFIG_COLDFIRE_SW_A7
	extern unsigned int sw_usp;
	sw_usp = usp;
#else
	register unsigned long a0 __asm__("a0") = usp;
	/* move %a0,%usp */
	__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
#endif
}

/*
 * User space process size: 3.75GB. This is hardcoded into a few places,
 * so don't change it unless you know what you are doing.
 */
#ifdef CONFIG_MMU
#if defined(CONFIG_COLDFIRE)
#define TASK_SIZE	(0xC0000000UL)
#elif defined(CONFIG_SUN3)
#define TASK_SIZE	(0x0E000000UL)
#else
#define TASK_SIZE	(0xF0000000UL)
#endif
#else
#define TASK_SIZE	(0xFFFFFFFFUL)
#endif

#ifdef __KERNEL__
#define STACK_TOP	TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP
#endif

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#ifdef CONFIG_MMU
#if defined(CONFIG_COLDFIRE)
#define TASK_UNMAPPED_BASE	0x60000000UL
#elif defined(CONFIG_SUN3)
#define TASK_UNMAPPED_BASE	0x0A000000UL
#else
#define TASK_UNMAPPED_BASE	0xC0000000UL
#endif
#define TASK_UNMAPPED_ALIGN(addr, off)	PAGE_ALIGN(addr)
#else
#define TASK_UNMAPPED_BASE	0
#endif

/* Address spaces (or Function Codes in Motorola lingo) */
#define USER_DATA     1
#define USER_PROGRAM  2
#define SUPER_DATA    5
#define SUPER_PROGRAM 6
#define CPU_SPACE     7

#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
/*
 * Set the SFC/DFC registers for special MM operations.  For most normal
 * operation these remain set to USER_DATA for the uaccess routines.
 */
static inline void set_fc(unsigned long val)
{
	WARN_ON_ONCE(in_interrupt());

	__asm__ __volatile__ ("movec %0,%/sfc\n\t"
			      "movec %0,%/dfc\n\t"
			      : /* no outputs */ : "r" (val) : "memory");
}
#else
static inline void set_fc(unsigned long val)
{
}
#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */

struct thread_struct {
	unsigned long  ksp;		/* kernel stack pointer */
	unsigned long  usp;		/* user stack pointer */
	unsigned short sr;		/* saved status register */
	unsigned short fc;		/* saved fc (sfc, dfc) */
	unsigned long  crp[2];		/* cpu root pointer */
	unsigned long  esp0;		/* points to SR of stack frame */
	unsigned long  faddr;		/* info about last fault */
	int            signo, code;
	unsigned long  fp[8*3];
	unsigned long  fpcntl[3];	/* fp control regs */
	unsigned char  fpstate[FPSTATESIZE];  /* floating point state */
};

#define INIT_THREAD  {							\
	.ksp	= sizeof(init_stack) + (unsigned long) init_stack,	\
	.sr	= PS_S,							\
	.fc	= USER_DATA,						\
}

/*
 * ColdFire stack format sbould be 0x4 for an aligned usp (will always be
 * true on thread creation). We need to set this explicitly.
 */
#ifdef CONFIG_COLDFIRE
#define setframeformat(_regs)	do { (_regs)->format = 0x4; } while(0)
#else
#define setframeformat(_regs)	do { } while (0)
#endif

/*
 * Do necessary setup to start up a newly executed thread.
 */
static inline void start_thread(struct pt_regs * regs, unsigned long pc,
				unsigned long usp)
{
	regs->pc = pc;
	regs->sr &= ~0x2000;
	setframeformat(regs);
	wrusp(usp);
}

/* Forward declaration, a strange C thing */
struct task_struct;

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

unsigned long get_wchan(struct task_struct *p);

#define	KSTK_EIP(tsk)	\
    ({			\
	unsigned long eip = 0;	 \
	if ((tsk)->thread.esp0 > PAGE_SIZE && \
	    (virt_addr_valid((tsk)->thread.esp0))) \
	      eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
	eip; })
#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)

#define task_pt_regs(tsk)	((struct pt_regs *) ((tsk)->thread.esp0))

#define cpu_relax()	barrier()

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
633ea5d7 GU	2	/*
	3	* include/asm-m68k/processor.h
	4	*
	5	* Copyright (C) 1995 Hamish Macdonald
	6	*/
	7
	8	#ifndef __ASM_M68K_PROCESSOR_H
	9	#define __ASM_M68K_PROCESSOR_H
	10
633ea5d7	11	#include <linux/thread_info.h>
633ea5d7 GU	12	#include <asm/fpu.h>
	13	#include <asm/ptrace.h>
	14
	15	static inline unsigned long rdusp(void)
	16	{
1c83af5f	17	#ifdef CONFIG_COLDFIRE_SW_A7
633ea5d7 GU	18	extern unsigned int sw_usp;
633ea5d7 GU	19	return sw_usp;
49148020	20	#else
1c83af5f GU	21	register unsigned long usp __asm__("a0");
	22	/* move %usp,%a0 */
	23	__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
633ea5d7 GU	24	return usp;
	25	#endif
	26	}
	27
	28	static inline void wrusp(unsigned long usp)
	29	{
1c83af5f	30	#ifdef CONFIG_COLDFIRE_SW_A7
633ea5d7 GU	31	extern unsigned int sw_usp;
	32	sw_usp = usp;
	33	#else
1c83af5f GU	34	register unsigned long a0 __asm__("a0") = usp;
	35	/* move %a0,%usp */
	36	__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
633ea5d7 GU	37	#endif
	38	}
	39
	40	/*
	41	* User space process size: 3.75GB. This is hardcoded into a few places,
	42	* so don't change it unless you know what you are doing.
	43	*/
cc24c405	44	#ifdef CONFIG_MMU
2c9b82ad GU	45	#if defined(CONFIG_COLDFIRE)
	46	#define TASK_SIZE (0xC0000000UL)
	47	#elif defined(CONFIG_SUN3)
633ea5d7	48	#define TASK_SIZE (0x0E000000UL)
2c9b82ad GU	49	#else
2c9b82ad GU	50	#define TASK_SIZE (0xF0000000UL)
633ea5d7	51	#endif
cc24c405 GU	52	#else
	53	#define TASK_SIZE (0xFFFFFFFFUL)
	54	#endif
633ea5d7 GU	55
	56	#ifdef __KERNEL__
	57	#define STACK_TOP TASK_SIZE
	58	#define STACK_TOP_MAX STACK_TOP
	59	#endif
	60
	61	/* This decides where the kernel will search for a free chunk of vm
	62	* space during mmap's.
	63	*/
	64	#ifdef CONFIG_MMU
2c9b82ad GU	65	#if defined(CONFIG_COLDFIRE)
	66	#define TASK_UNMAPPED_BASE 0x60000000UL
	67	#elif defined(CONFIG_SUN3)
633ea5d7	68	#define TASK_UNMAPPED_BASE 0x0A000000UL
2c9b82ad GU	69	#else
2c9b82ad GU	70	#define TASK_UNMAPPED_BASE 0xC0000000UL
633ea5d7 GU	71	#endif
	72	#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
	73	#else
	74	#define TASK_UNMAPPED_BASE 0
	75	#endif
	76
9fde0348 CH	77	/* Address spaces (or Function Codes in Motorola lingo) */
	78	#define USER_DATA 1
	79	#define USER_PROGRAM 2
	80	#define SUPER_DATA 5
	81	#define SUPER_PROGRAM 6
	82	#define CPU_SPACE 7
	83
	84	#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
	85	/*
	86	* Set the SFC/DFC registers for special MM operations. For most normal
	87	* operation these remain set to USER_DATA for the uaccess routines.
	88	*/
	89	static inline void set_fc(unsigned long val)
	90	{
	91	WARN_ON_ONCE(in_interrupt());
	92
	93	__asm__ __volatile__ ("movec %0,%/sfc\n\t"
	94	"movec %0,%/dfc\n\t"
	95	: /* no outputs */ : "r" (val) : "memory");
	96	}
	97	#else
	98	static inline void set_fc(unsigned long val)
	99	{
	100	}
	101	#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */
	102
633ea5d7 GU	103	struct thread_struct {
	104	unsigned long ksp; /* kernel stack pointer */
	105	unsigned long usp; /* user stack pointer */
	106	unsigned short sr; /* saved status register */
9fde0348	107	unsigned short fc; /* saved fc (sfc, dfc) */
633ea5d7 GU	108	unsigned long crp[2]; /* cpu root pointer */
	109	unsigned long esp0; /* points to SR of stack frame */
	110	unsigned long faddr; /* info about last fault */
	111	int signo, code;
	112	unsigned long fp[8*3];
	113	unsigned long fpcntl[3]; /* fp control regs */
	114	unsigned char fpstate[FPSTATESIZE]; /* floating point state */
633ea5d7 GU	115	};
	116
	117	#define INIT_THREAD { \
	118	.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
	119	.sr = PS_S, \
9fde0348	120	.fc = USER_DATA, \
633ea5d7 GU	121	}
633ea5d7 GU	122
0973c687 GU	123	/*
	124	* ColdFire stack format sbould be 0x4 for an aligned usp (will always be
	125	* true on thread creation). We need to set this explicitly.
	126	*/
	127	#ifdef CONFIG_COLDFIRE
	128	#define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0)
	129	#else
	130	#define setframeformat(_regs) do { } while (0)
	131	#endif
	132
633ea5d7 GU	133	/*
	134	* Do necessary setup to start up a newly executed thread.
	135	*/
	136	static inline void start_thread(struct pt_regs * regs, unsigned long pc,
	137	unsigned long usp)
	138	{
633ea5d7 GU	139	regs->pc = pc;
633ea5d7 GU	140	regs->sr &= ~0x2000;
0973c687	141	setframeformat(regs);
633ea5d7 GU	142	wrusp(usp);
	143	}
	144
633ea5d7 GU	145	/* Forward declaration, a strange C thing */
	146	struct task_struct;
	147
	148	/* Free all resources held by a thread. */
	149	static inline void release_thread(struct task_struct *dead_task)
	150	{
	151	}
	152
633ea5d7 GU	153	unsigned long get_wchan(struct task_struct *p);
	154
	155	#define KSTK_EIP(tsk) \
	156	({ \
	157	unsigned long eip = 0; \
	158	if ((tsk)->thread.esp0 > PAGE_SIZE && \
	159	(virt_addr_valid((tsk)->thread.esp0))) \
	160	eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
	161	eip; })
	162	#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
	163
c23b6538 GU	164	#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0))
c23b6538 GU	165
633ea5d7 GU	166	#define cpu_relax() barrier()
633ea5d7 GU	167
49148020	168	#endif