[linux-2.6-block.git] / arch / sparc / include / asm / processor_64.h

/*
 * include/asm/processor.h
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#ifndef __ASM_SPARC64_PROCESSOR_H
#define __ASM_SPARC64_PROCESSOR_H

/*
 * Sparc64 implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })

#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/page.h>

/* Don't hold the runqueue lock over context switch */
#define __ARCH_WANT_UNLOCKED_CTXSW

/* 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 */

/*
 * User lives in his very own context, and cannot reference us. Note
 * that TASK_SIZE is a misnomer, it really gives maximum user virtual
 * address that the kernel will allocate out.
 *
 * XXX No longer using virtual page tables, kill this upper limit...
 */
#define VA_BITS		44
#ifndef __ASSEMBLY__
#define VPTE_SIZE	(1UL << (VA_BITS - PAGE_SHIFT + 3))
#else
#define VPTE_SIZE	(1 << (VA_BITS - PAGE_SHIFT + 3))
#endif

#define TASK_SIZE_OF(tsk) \
	(test_tsk_thread_flag(tsk,TIF_32BIT) ? \
	 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
#define TASK_SIZE	TASK_SIZE_OF(current)
#ifdef __KERNEL__

#define STACK_TOP32	((1UL << 32UL) - PAGE_SIZE)
#define STACK_TOP64	(0x0000080000000000UL - (1UL << 32UL))

#define STACK_TOP	(test_thread_flag(TIF_32BIT) ? \
			 STACK_TOP32 : STACK_TOP64)

#define STACK_TOP_MAX	STACK_TOP64

#endif

#ifndef __ASSEMBLY__

typedef struct {
	unsigned char seg;
} mm_segment_t;

/* The Sparc processor specific thread struct. */
/* XXX This should die, everything can go into thread_info now. */
struct thread_struct {
#ifdef CONFIG_DEBUG_SPINLOCK
	/* How many spinlocks held by this thread.
	 * Used with spin lock debugging to catch tasks
	 * sleeping illegally with locks held.
	 */
	int smp_lock_count;
	unsigned int smp_lock_pc;
#else
	int dummy; /* f'in gcc bug... */
#endif
};

#endif /* !(__ASSEMBLY__) */

#ifndef CONFIG_DEBUG_SPINLOCK
#define INIT_THREAD  {			\
	0,				\
}
#else /* CONFIG_DEBUG_SPINLOCK */
#define INIT_THREAD  {					\
/* smp_lock_count, smp_lock_pc, */			\
   0,		   0,					\
}
#endif /* !(CONFIG_DEBUG_SPINLOCK) */

#ifndef __ASSEMBLY__

#include <linux/types.h>

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

/* On Uniprocessor, even in RMO processes see TSO semantics */
#ifdef CONFIG_SMP
#define TSTATE_INITIAL_MM	TSTATE_TSO
#else
#define TSTATE_INITIAL_MM	TSTATE_RMO
#endif

/* Do necessary setup to start up a newly executed thread. */
#define start_thread(regs, pc, sp) \
do { \
	unsigned long __asi = ASI_PNF; \
	regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
	regs->tpc = ((pc & (~3)) - 4); \
	regs->tnpc = regs->tpc + 4; \
	regs->y = 0; \
	set_thread_wstate(1 << 3); \
	if (current_thread_info()->utraps) { \
		if (*(current_thread_info()->utraps) < 2) \
			kfree(current_thread_info()->utraps); \
		else \
			(*(current_thread_info()->utraps))--; \
		current_thread_info()->utraps = NULL; \
	} \
	__asm__ __volatile__( \
	"stx		%%g0, [%0 + %2 + 0x00]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x08]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x10]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x18]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x20]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x28]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x30]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x38]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x40]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x48]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x50]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x58]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x60]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x68]\n\t" \
	"stx		%1,   [%0 + %2 + 0x70]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x78]\n\t" \
	"wrpr		%%g0, (1 << 3), %%wstate\n\t" \
	: \
	: "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
	  "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
} while (0)

#define start_thread32(regs, pc, sp) \
do { \
	unsigned long __asi = ASI_PNF; \
	pc &= 0x00000000ffffffffUL; \
	sp &= 0x00000000ffffffffUL; \
	regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
	regs->tpc = ((pc & (~3)) - 4); \
	regs->tnpc = regs->tpc + 4; \
	regs->y = 0; \
	set_thread_wstate(2 << 3); \
	if (current_thread_info()->utraps) { \
		if (*(current_thread_info()->utraps) < 2) \
			kfree(current_thread_info()->utraps); \
		else \
			(*(current_thread_info()->utraps))--; \
		current_thread_info()->utraps = NULL; \
	} \
	__asm__ __volatile__( \
	"stx		%%g0, [%0 + %2 + 0x00]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x08]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x10]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x18]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x20]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x28]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x30]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x38]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x40]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x48]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x50]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x58]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x60]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x68]\n\t" \
	"stx		%1,   [%0 + %2 + 0x70]\n\t" \
	"stx		%%g0, [%0 + %2 + 0x78]\n\t" \
	"wrpr		%%g0, (2 << 3), %%wstate\n\t" \
	: \
	: "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
	  "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
} while (0)

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

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

extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

extern unsigned long get_wchan(struct task_struct *task);

#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
#define KSTK_EIP(tsk)  (task_pt_regs(tsk)->tpc)
#define KSTK_ESP(tsk)  (task_pt_regs(tsk)->u_regs[UREG_FP])

#define cpu_relax()	barrier()

/* Prefetch support.  This is tuned for UltraSPARC-III and later.
 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
 * a shallower prefetch queue than later chips.
 */
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH

static inline void prefetch(const void *x)
{
	/* We do not use the read prefetch mnemonic because that
	 * prefetches into the prefetch-cache which only is accessible
	 * by floating point operations in UltraSPARC-III and later.
	 * By contrast, "#one_write" prefetches into the L2 cache
	 * in shared state.
	 */
	__asm__ __volatile__("prefetch [%0], #one_write"
			     : /* no outputs */
			     : "r" (x));
}

static inline void prefetchw(const void *x)
{
	/* The most optimal prefetch to use for writes is
	 * "#n_writes".  This brings the cacheline into the
	 * L2 cache in "owned" state.
	 */
	__asm__ __volatile__("prefetch [%0], #n_writes"
			     : /* no outputs */
			     : "r" (x));
}

#define spin_lock_prefetch(x)	prefetchw(x)

#define HAVE_ARCH_PICK_MMAP_LAYOUT

#endif /* !(__ASSEMBLY__) */

#endif /* !(__ASM_SPARC64_PROCESSOR_H) */
Commit	Line	Data
f5e706ad	1	/*
a439fe51	2	* include/asm/processor.h
f5e706ad SR	3	*
	4	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	5	*/
	6
	7	#ifndef __ASM_SPARC64_PROCESSOR_H
	8	#define __ASM_SPARC64_PROCESSOR_H
	9
	10	/*
	11	* Sparc64 implementation of macro that returns current
	12	* instruction pointer ("program counter").
	13	*/
	14	#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })
	15
	16	#include <asm/asi.h>
	17	#include <asm/pstate.h>
	18	#include <asm/ptrace.h>
	19	#include <asm/page.h>
	20
d550bbd4 DH	21	/* Don't hold the runqueue lock over context switch */
	22	#define __ARCH_WANT_UNLOCKED_CTXSW
	23
f5e706ad SR	24	/* The sparc has no problems with write protection */
	25	#define wp_works_ok 1
	26	#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
	27
	28	/*
	29	* User lives in his very own context, and cannot reference us. Note
	30	* that TASK_SIZE is a misnomer, it really gives maximum user virtual
	31	* address that the kernel will allocate out.
	32	*
	33	* XXX No longer using virtual page tables, kill this upper limit...
	34	*/
	35	#define VA_BITS 44
	36	#ifndef __ASSEMBLY__
	37	#define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3))
	38	#else
	39	#define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3))
	40	#endif
	41
f5e706ad SR	42	#define TASK_SIZE_OF(tsk) \
f5e706ad SR	43	(test_tsk_thread_flag(tsk,TIF_32BIT) ? \
a1995a65 DM	44	(1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
a1995a65 DM	45	#define TASK_SIZE TASK_SIZE_OF(current)
f5e706ad SR	46	#ifdef __KERNEL__
	47
	48	#define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE)
	49	#define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL))
	50
	51	#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
	52	STACK_TOP32 : STACK_TOP64)
	53
	54	#define STACK_TOP_MAX STACK_TOP64
	55
	56	#endif
	57
	58	#ifndef __ASSEMBLY__
	59
	60	typedef struct {
	61	unsigned char seg;
	62	} mm_segment_t;
	63
	64	/* The Sparc processor specific thread struct. */
	65	/* XXX This should die, everything can go into thread_info now. */
	66	struct thread_struct {
	67	#ifdef CONFIG_DEBUG_SPINLOCK
	68	/* How many spinlocks held by this thread.
	69	* Used with spin lock debugging to catch tasks
	70	* sleeping illegally with locks held.
	71	*/
	72	int smp_lock_count;
	73	unsigned int smp_lock_pc;
	74	#else
	75	int dummy; /* f'in gcc bug... */
	76	#endif
	77	};
	78
	79	#endif /* !(__ASSEMBLY__) */
	80
	81	#ifndef CONFIG_DEBUG_SPINLOCK
	82	#define INIT_THREAD { \
	83	0, \
	84	}
	85	#else /* CONFIG_DEBUG_SPINLOCK */
	86	#define INIT_THREAD { \
	87	/* smp_lock_count, smp_lock_pc, */ \
	88	0, 0, \
	89	}
	90	#endif /* !(CONFIG_DEBUG_SPINLOCK) */
	91
	92	#ifndef __ASSEMBLY__
	93
	94	#include <linux/types.h>
	95
	96	/* Return saved PC of a blocked thread. */
	97	struct task_struct;
	98	extern unsigned long thread_saved_pc(struct task_struct *);
	99
	100	/* On Uniprocessor, even in RMO processes see TSO semantics */
	101	#ifdef CONFIG_SMP
	102	#define TSTATE_INITIAL_MM TSTATE_TSO
	103	#else
	104	#define TSTATE_INITIAL_MM TSTATE_RMO
	105	#endif
	106
	107	/* Do necessary setup to start up a newly executed thread. */
	108	#define start_thread(regs, pc, sp) \
	109	do { \
110	unsigned long __asi = ASI_PNF; \
111	regs->tstate = (regs->tstate & (TSTATE_CWP)) \| (TSTATE_INITIAL_MM\|TSTATE_IE) \| (__asi << 24UL); \
112	regs->tpc = ((pc & (~3)) - 4); \
113	regs->tnpc = regs->tpc + 4; \
114	regs->y = 0; \
115	set_thread_wstate(1 << 3); \
116	if (current_thread_info()->utraps) { \
117	if (*(current_thread_info()->utraps) < 2) \
118	kfree(current_thread_info()->utraps); \
119	else \
120	(*(current_thread_info()->utraps))--; \
121	current_thread_info()->utraps = NULL; \
122	} \
123	__asm__ __volatile__( \
124	"stx %%g0, [%0 + %2 + 0x00]\n\t" \
125	"stx %%g0, [%0 + %2 + 0x08]\n\t" \
126	"stx %%g0, [%0 + %2 + 0x10]\n\t" \
127	"stx %%g0, [%0 + %2 + 0x18]\n\t" \
128	"stx %%g0, [%0 + %2 + 0x20]\n\t" \
129	"stx %%g0, [%0 + %2 + 0x28]\n\t" \
130	"stx %%g0, [%0 + %2 + 0x30]\n\t" \
131	"stx %%g0, [%0 + %2 + 0x38]\n\t" \
132	"stx %%g0, [%0 + %2 + 0x40]\n\t" \
133	"stx %%g0, [%0 + %2 + 0x48]\n\t" \
134	"stx %%g0, [%0 + %2 + 0x50]\n\t" \
135	"stx %%g0, [%0 + %2 + 0x58]\n\t" \
136	"stx %%g0, [%0 + %2 + 0x60]\n\t" \
137	"stx %%g0, [%0 + %2 + 0x68]\n\t" \
138	"stx %1, [%0 + %2 + 0x70]\n\t" \
139	"stx %%g0, [%0 + %2 + 0x78]\n\t" \
140	"wrpr %%g0, (1 << 3), %%wstate\n\t" \
141	: \
142	: "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
143	"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
144	} while (0)
145
146	#define start_thread32(regs, pc, sp) \
147	do { \
148	unsigned long __asi = ASI_PNF; \
149	pc &= 0x00000000ffffffffUL; \
150	sp &= 0x00000000ffffffffUL; \
151	regs->tstate = (regs->tstate & (TSTATE_CWP))\|(TSTATE_INITIAL_MM\|TSTATE_IE\|TSTATE_AM) \| (__asi << 24UL); \
152	regs->tpc = ((pc & (~3)) - 4); \
153	regs->tnpc = regs->tpc + 4; \
154	regs->y = 0; \
155	set_thread_wstate(2 << 3); \
156	if (current_thread_info()->utraps) { \
157	if (*(current_thread_info()->utraps) < 2) \
158	kfree(current_thread_info()->utraps); \
159	else \
160	(*(current_thread_info()->utraps))--; \
161	current_thread_info()->utraps = NULL; \
162	} \
163	__asm__ __volatile__( \
164	"stx %%g0, [%0 + %2 + 0x00]\n\t" \
165	"stx %%g0, [%0 + %2 + 0x08]\n\t" \
166	"stx %%g0, [%0 + %2 + 0x10]\n\t" \
167	"stx %%g0, [%0 + %2 + 0x18]\n\t" \
168	"stx %%g0, [%0 + %2 + 0x20]\n\t" \
169	"stx %%g0, [%0 + %2 + 0x28]\n\t" \
170	"stx %%g0, [%0 + %2 + 0x30]\n\t" \
171	"stx %%g0, [%0 + %2 + 0x38]\n\t" \
172	"stx %%g0, [%0 + %2 + 0x40]\n\t" \
173	"stx %%g0, [%0 + %2 + 0x48]\n\t" \
174	"stx %%g0, [%0 + %2 + 0x50]\n\t" \
175	"stx %%g0, [%0 + %2 + 0x58]\n\t" \
176	"stx %%g0, [%0 + %2 + 0x60]\n\t" \
177	"stx %%g0, [%0 + %2 + 0x68]\n\t" \
178	"stx %1, [%0 + %2 + 0x70]\n\t" \
179	"stx %%g0, [%0 + %2 + 0x78]\n\t" \
180	"wrpr %%g0, (2 << 3), %%wstate\n\t" \
181	: \
182	: "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
183	"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
184	} while (0)
185
186	/* Free all resources held by a thread. */
187	#define release_thread(tsk) do { } while (0)
188
189	/* Prepare to copy thread state - unlazy all lazy status */
190	#define prepare_to_copy(tsk) do { } while (0)
191
192	extern pid_t kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
193
194	extern unsigned long get_wchan(struct task_struct *task);
195
196	#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
197	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc)
198	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP])
199
200	#define cpu_relax() barrier()
201
202	/* Prefetch support. This is tuned for UltraSPARC-III and later.
203	* UltraSPARC-I will treat these as nops, and UltraSPARC-II has
204	* a shallower prefetch queue than later chips.
205	*/
206	#define ARCH_HAS_PREFETCH
207	#define ARCH_HAS_PREFETCHW
208	#define ARCH_HAS_SPINLOCK_PREFETCH
209
210	static inline void prefetch(const void *x)
211	{
212	/* We do not use the read prefetch mnemonic because that
213	* prefetches into the prefetch-cache which only is accessible
214	* by floating point operations in UltraSPARC-III and later.
215	* By contrast, "#one_write" prefetches into the L2 cache
216	* in shared state.
217	*/
218	__asm__ __volatile__("prefetch [%0], #one_write"
219	: /* no outputs */
220	: "r" (x));
221	}
222
223	static inline void prefetchw(const void *x)
224	{
225	/* The most optimal prefetch to use for writes is
226	* "#n_writes". This brings the cacheline into the
227	* L2 cache in "owned" state.
228	*/
229	__asm__ __volatile__("prefetch [%0], #n_writes"
230	: /* no outputs */
231	: "r" (x));
232	}
233
234	#define spin_lock_prefetch(x) prefetchw(x)
235
236	#define HAVE_ARCH_PICK_MMAP_LAYOUT
237
238	#endif /* !(__ASSEMBLY__) */
239
240	#endif /* !(__ASM_SPARC64_PROCESSOR_H) */