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

/* include/asm-sparc/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/btfixup.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. */
extern 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_window)),
			       "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)
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk)	do { } while (0)

extern unsigned long get_wchan(struct task_struct *);

#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;

#define cpu_relax()	barrier()

#endif

#endif /* __ASM_SPARC_PROCESSOR_H */
Commit	Line	Data
f5e706ad SR	1	/* include/asm-sparc/processor.h
	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>
	19	#include <asm/btfixup.h>
	20	#include <asm/page.h>
	21
	22	/*
	23	* The sparc has no problems with write protection
	24	*/
	25	#define wp_works_ok 1
	26	#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
	27
	28	/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
	29	* That one page is used to protect kernel from intruders, so that
	30	* we can make our access_ok test faster
	31	*/
	32	#define TASK_SIZE PAGE_OFFSET
	33	#ifdef __KERNEL__
	34	#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
	35	#define STACK_TOP_MAX STACK_TOP
	36	#endif /* __KERNEL__ */
	37
	38	struct task_struct;
	39
	40	#ifdef __KERNEL__
	41	struct fpq {
	42	unsigned long *insn_addr;
	43	unsigned long insn;
	44	};
	45	#endif
	46
	47	typedef struct {
	48	int seg;
	49	} mm_segment_t;
	50
	51	/* The Sparc processor specific thread struct. */
	52	struct thread_struct {
	53	struct pt_regs *kregs;
	54	unsigned int _pad1;
	55
	56	/* Special child fork kpsr/kwim values. */
	57	unsigned long fork_kpsr __attribute__ ((aligned (8)));
	58	unsigned long fork_kwim;
	59
	60	/* Floating point regs */
	61	unsigned long float_regs[32] __attribute__ ((aligned (8)));
	62	unsigned long fsr;
	63	unsigned long fpqdepth;
	64	struct fpq fpqueue[16];
65	unsigned long flags;
66	mm_segment_t current_ds;
67	};
68
69	#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
70	#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
71
72	#define INIT_THREAD { \
73	.flags = SPARC_FLAG_KTHREAD, \
74	.current_ds = KERNEL_DS, \
75	}
76
77	/* Return saved PC of a blocked thread. */
78	extern unsigned long thread_saved_pc(struct task_struct *t);
79
80	/* Do necessary setup to start up a newly executed thread. */
81	static inline void start_thread(struct pt_regs * regs, unsigned long pc,
82	unsigned long sp)
83	{
84	register unsigned long zero asm("g1");
85
86	regs->psr = (regs->psr & (PSR_CWP)) \| PSR_S;
87	regs->pc = ((pc & (~3)) - 4);
88	regs->npc = regs->pc + 4;
89	regs->y = 0;
90	zero = 0;
91	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
92	"std\t%%g0, [%0 + %3 + 0x08]\n\t"
93	"std\t%%g0, [%0 + %3 + 0x10]\n\t"
94	"std\t%%g0, [%0 + %3 + 0x18]\n\t"
95	"std\t%%g0, [%0 + %3 + 0x20]\n\t"
96	"std\t%%g0, [%0 + %3 + 0x28]\n\t"
97	"std\t%%g0, [%0 + %3 + 0x30]\n\t"
98	"st\t%1, [%0 + %3 + 0x38]\n\t"
99	"st\t%%g0, [%0 + %3 + 0x3c]"
100	: /* no outputs */
101	: "r" (regs),
102	"r" (sp - sizeof(struct reg_window)),
103	"r" (zero),
104	"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
105	: "memory");
106	}
107
108	/* Free all resources held by a thread. */
109	#define release_thread(tsk) do { } while(0)
110	extern pid_t kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
111
112	/* Prepare to copy thread state - unlazy all lazy status */
113	#define prepare_to_copy(tsk) do { } while (0)
114
115	extern unsigned long get_wchan(struct task_struct *);
116
117	#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
118	#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
119
120	#ifdef __KERNEL__
121
122	extern struct task_struct *last_task_used_math;
123
124	#define cpu_relax() barrier()
125
126	#endif
127
128	#endif /* __ASM_SPARC_PROCESSOR_H */