[deliverable/linux.git] / arch / sparc / include / asm / processor_32.h

/* include/asm/processor.h
 *
 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
 */

#ifndef __ASM_SPARC_PROCESSOR_H
#define __ASM_SPARC_PROCESSOR_H

/*
 * Sparc32 implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })

#include <asm/psr.h>
#include <asm/ptrace.h>
#include <asm/head.h>
#include <asm/signal.h>
#include <asm/page.h>

/*
 * The sparc has no problems with write protection
 */
#define wp_works_ok 1
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */

/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
 * That one page is used to protect kernel from intruders, so that
 * we can make our access_ok test faster
 */
#define TASK_SIZE	PAGE_OFFSET
#ifdef __KERNEL__
#define STACK_TOP	(PAGE_OFFSET - PAGE_SIZE)
#define STACK_TOP_MAX	STACK_TOP
#endif /* __KERNEL__ */

struct task_struct;

#ifdef __KERNEL__
struct fpq {
	unsigned long *insn_addr;
	unsigned long insn;
};
#endif

typedef struct {
	int seg;
} mm_segment_t;

/* The Sparc processor specific thread struct. */
struct thread_struct {
	struct pt_regs *kregs;
	unsigned int _pad1;

	/* Special child fork kpsr/kwim values. */
	unsigned long fork_kpsr __attribute__ ((aligned (8)));
	unsigned long fork_kwim;

	/* Floating point regs */
	unsigned long   float_regs[32] __attribute__ ((aligned (8)));
	unsigned long   fsr;
	unsigned long   fpqdepth;
	struct fpq	fpqueue[16];
	unsigned long flags;
	mm_segment_t current_ds;
};

#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */

#define INIT_THREAD  { \
	.flags = SPARC_FLAG_KTHREAD, \
	.current_ds = KERNEL_DS, \
}

/* Return saved PC of a blocked thread. */
unsigned long thread_saved_pc(struct task_struct *t);

/* Do necessary setup to start up a newly executed thread. */
static inline void start_thread(struct pt_regs * regs, unsigned long pc,
				    unsigned long sp)
{
	register unsigned long zero asm("g1");

	regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
	regs->pc = ((pc & (~3)) - 4);
	regs->npc = regs->pc + 4;
	regs->y = 0;
	zero = 0;
	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x08]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x10]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x18]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x20]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x28]\n\t"
			     "std\t%%g0, [%0 + %3 + 0x30]\n\t"
			     "st\t%1, [%0 + %3 + 0x38]\n\t"
			     "st\t%%g0, [%0 + %3 + 0x3c]"
			     : /* no outputs */
			     : "r" (regs),
			       "r" (sp - sizeof(struct reg_window32)),
			       "r" (zero),
			       "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
			     : "memory");
}

/* Free all resources held by a thread. */
#define release_thread(tsk)		do { } while(0)

unsigned long get_wchan(struct task_struct *);

#define task_pt_regs(tsk) ((tsk)->thread.kregs)
#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])

#ifdef __KERNEL__

extern struct task_struct *last_task_used_math;
int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);

#define cpu_relax()	barrier()
extern void (*sparc_idle)(void);

#endif

#endif /* __ASM_SPARC_PROCESSOR_H */
Commit	Line	Data
a439fe51	1	/* include/asm/processor.h
f5e706ad SR	2	*
	3	* Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
	4	*/
	5
	6	#ifndef __ASM_SPARC_PROCESSOR_H
	7	#define __ASM_SPARC_PROCESSOR_H
	8
	9	/*
	10	* Sparc32 implementation of macro that returns current
	11	* instruction pointer ("program counter").
	12	*/
	13	#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
	14
	15	#include <asm/psr.h>
	16	#include <asm/ptrace.h>
	17	#include <asm/head.h>
	18	#include <asm/signal.h>
f5e706ad SR	19	#include <asm/page.h>
	20
	21	/*
	22	* The sparc has no problems with write protection
	23	*/
	24	#define wp_works_ok 1
	25	#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
	26
	27	/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
	28	* That one page is used to protect kernel from intruders, so that
	29	* we can make our access_ok test faster
	30	*/
	31	#define TASK_SIZE PAGE_OFFSET
	32	#ifdef __KERNEL__
	33	#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
	34	#define STACK_TOP_MAX STACK_TOP
	35	#endif /* __KERNEL__ */
	36
	37	struct task_struct;
	38
	39	#ifdef __KERNEL__
	40	struct fpq {
	41	unsigned long *insn_addr;
	42	unsigned long insn;
	43	};
	44	#endif
	45
	46	typedef struct {
	47	int seg;
	48	} mm_segment_t;
	49
	50	/* The Sparc processor specific thread struct. */
	51	struct thread_struct {
	52	struct pt_regs *kregs;
	53	unsigned int _pad1;
	54
	55	/* Special child fork kpsr/kwim values. */
	56	unsigned long fork_kpsr __attribute__ ((aligned (8)));
	57	unsigned long fork_kwim;
	58
	59	/* Floating point regs */
	60	unsigned long float_regs[32] __attribute__ ((aligned (8)));
	61	unsigned long fsr;
	62	unsigned long fpqdepth;
	63	struct fpq fpqueue[16];
	64	unsigned long flags;
	65	mm_segment_t current_ds;
	66	};
	67
	68	#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
	69	#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
	70
	71	#define INIT_THREAD { \
	72	.flags = SPARC_FLAG_KTHREAD, \
	73	.current_ds = KERNEL_DS, \
	74	}
	75
	76	/* Return saved PC of a blocked thread. */
f05a6865	77	unsigned long thread_saved_pc(struct task_struct *t);
f5e706ad SR	78
	79	/* Do necessary setup to start up a newly executed thread. */
	80	static inline void start_thread(struct pt_regs * regs, unsigned long pc,
	81	unsigned long sp)
	82	{
	83	register unsigned long zero asm("g1");
	84
	85	regs->psr = (regs->psr & (PSR_CWP)) \| PSR_S;
	86	regs->pc = ((pc & (~3)) - 4);
	87	regs->npc = regs->pc + 4;
	88	regs->y = 0;
	89	zero = 0;
	90	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
	91	"std\t%%g0, [%0 + %3 + 0x08]\n\t"
	92	"std\t%%g0, [%0 + %3 + 0x10]\n\t"
	93	"std\t%%g0, [%0 + %3 + 0x18]\n\t"
	94	"std\t%%g0, [%0 + %3 + 0x20]\n\t"
	95	"std\t%%g0, [%0 + %3 + 0x28]\n\t"
	96	"std\t%%g0, [%0 + %3 + 0x30]\n\t"
	97	"st\t%1, [%0 + %3 + 0x38]\n\t"
	98	"st\t%%g0, [%0 + %3 + 0x3c]"
	99	: /* no outputs */
	100	: "r" (regs),
4d7b92ad	101	"r" (sp - sizeof(struct reg_window32)),
f5e706ad SR	102	"r" (zero),
	103	"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
	104	: "memory");
	105	}
	106
	107	/* Free all resources held by a thread. */
	108	#define release_thread(tsk) do { } while(0)
f5e706ad	109
f05a6865	110	unsigned long get_wchan(struct task_struct *);
f5e706ad	111
ebd3c003	112	#define task_pt_regs(tsk) ((tsk)->thread.kregs)
f5e706ad SR	113	#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
	114	#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
	115
	116	#ifdef __KERNEL__
	117
	118	extern struct task_struct *last_task_used_math;
8e9f0935	119	int do_mathemu(struct pt_regs regs, struct task_struct fpt);
f5e706ad SR	120
f5e706ad SR	121	#define cpu_relax() barrier()
d472ba84	122	extern void (*sparc_idle)(void);
f5e706ad SR	123
	124	#endif
	125
	126	#endif /* __ASM_SPARC_PROCESSOR_H */