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

/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */

#ifndef __SPARC_SYSTEM_H
#define __SPARC_SYSTEM_H

#include <linux/kernel.h>
#include <linux/threads.h>	/* NR_CPUS */
#include <linux/thread_info.h>

#include <asm/page.h>
#include <asm/psr.h>
#include <asm/ptrace.h>
#include <asm/btfixup.h>
#include <asm/smp.h>

#ifndef __ASSEMBLY__

/*
 * Sparc (general) CPU types
 */
enum sparc_cpu {
  sun4        = 0x00,
  sun4c       = 0x01,
  sun4m       = 0x02,
  sun4d       = 0x03,
  sun4e       = 0x04,
  sun4u       = 0x05, /* V8 ploos ploos */
  sun_unknown = 0x06,
  ap1000      = 0x07, /* almost a sun4m */
};

/* Really, userland should not be looking at any of this... */
#ifdef __KERNEL__

extern enum sparc_cpu sparc_cpu_model;

#ifndef CONFIG_SUN4
#define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c)
#define ARCH_SUN4 0
#else
#define ARCH_SUN4C_SUN4 1
#define ARCH_SUN4 1
#endif

#define SUN4M_NCPUS            4              /* Architectural limit of sun4m. */

extern struct thread_info *current_set[NR_CPUS];

extern unsigned long empty_bad_page;
extern unsigned long empty_bad_page_table;
extern unsigned long empty_zero_page;

extern void sun_do_break(void);
extern int serial_console;
extern int stop_a_enabled;

static __inline__ int con_is_present(void)
{
	return serial_console ? 0 : 1;
}

/* When a context switch happens we must flush all user windows so that
 * the windows of the current process are flushed onto its stack. This
 * way the windows are all clean for the next process and the stack
 * frames are up to date.
 */
extern void flush_user_windows(void);
extern void kill_user_windows(void);
extern void synchronize_user_stack(void);
extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
		   void *fpqueue, unsigned long *fpqdepth);

#ifdef CONFIG_SMP
#define SWITCH_ENTER(prv) \
	do {			\
	if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
		put_psr(get_psr() | PSR_EF); \
		fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
		       &(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
		clear_tsk_thread_flag(prv, TIF_USEDFPU); \
		(prv)->thread.kregs->psr &= ~PSR_EF; \
	} \
	} while(0)

#define SWITCH_DO_LAZY_FPU(next)	/* */
#else
#define SWITCH_ENTER(prv)		/* */
#define SWITCH_DO_LAZY_FPU(nxt)	\
	do {			\
	if (last_task_used_math != (nxt))		\
		(nxt)->thread.kregs->psr&=~PSR_EF;	\
	} while(0)
#endif

/*
 * Flush windows so that the VM switch which follows
 * would not pull the stack from under us.
 *
 * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
 * XXX WTF is the above comment? Found in late teen 2.4.x.
 */
#define prepare_arch_switch(next) do { \
	__asm__ __volatile__( \
	".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
	"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
	"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
	"save %sp, -0x40, %sp\n\t" \
	"restore; restore; restore; restore; restore; restore; restore"); \
} while(0)

	/* Much care has gone into this code, do not touch it.
	 *
	 * We need to loadup regs l0/l1 for the newly forked child
	 * case because the trap return path relies on those registers
	 * holding certain values, gcc is told that they are clobbered.
	 * Gcc needs registers for 3 values in and 1 value out, so we
	 * clobber every non-fixed-usage register besides l2/l3/o4/o5.  -DaveM
	 *
	 * Hey Dave, that do not touch sign is too much of an incentive
	 * - Anton & Pete
	 */
#define switch_to(prev, next, last) do {						\
	SWITCH_ENTER(prev);								\
	SWITCH_DO_LAZY_FPU(next);							\
	cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask);			\
	__asm__ __volatile__(								\
	"sethi	%%hi(here - 0x8), %%o7\n\t"						\
	"mov	%%g6, %%g3\n\t"								\
	"or	%%o7, %%lo(here - 0x8), %%o7\n\t"					\
	"rd	%%psr, %%g4\n\t"							\
	"std	%%sp, [%%g6 + %4]\n\t"							\
	"rd	%%wim, %%g5\n\t"							\
	"wr	%%g4, 0x20, %%psr\n\t"							\
	"nop\n\t"									\
	"std	%%g4, [%%g6 + %3]\n\t"							\
	"ldd	[%2 + %3], %%g4\n\t"							\
	"mov	%2, %%g6\n\t"								\
	".globl	patchme_store_new_current\n"						\
"patchme_store_new_current:\n\t"							\
	"st	%2, [%1]\n\t"								\
	"wr	%%g4, 0x20, %%psr\n\t"							\
	"nop\n\t"									\
	"nop\n\t"									\
	"nop\n\t"	/* LEON needs all 3 nops: load to %sp depends on CWP. */		\
	"ldd	[%%g6 + %4], %%sp\n\t"							\
	"wr	%%g5, 0x0, %%wim\n\t"							\
	"ldd	[%%sp + 0x00], %%l0\n\t"						\
	"ldd	[%%sp + 0x38], %%i6\n\t"						\
	"wr	%%g4, 0x0, %%psr\n\t"							\
	"nop\n\t"									\
	"nop\n\t"									\
	"jmpl	%%o7 + 0x8, %%g0\n\t"							\
	" ld	[%%g3 + %5], %0\n\t"							\
	"here:\n"									\
        : "=&r" (last)									\
        : "r" (&(current_set[hard_smp_processor_id()])),	\
	  "r" (task_thread_info(next)),				\
	  "i" (TI_KPSR),					\
	  "i" (TI_KSP),						\
	  "i" (TI_TASK)						\
	:       "g1", "g2", "g3", "g4", "g5",       "g7",	\
	  "l0", "l1",       "l3", "l4", "l5", "l6", "l7",	\
	  "i0", "i1", "i2", "i3", "i4", "i5",			\
	  "o0", "o1", "o2", "o3",                   "o7");	\
	} while(0)

/*
 * Changing the IRQ level on the Sparc.
 */
extern void local_irq_restore(unsigned long);
extern unsigned long __local_irq_save(void);
extern void local_irq_enable(void);

static inline unsigned long getipl(void)
{
	unsigned long retval;

	__asm__ __volatile__("rd	%%psr, %0" : "=r" (retval));
	return retval;
}

#define local_save_flags(flags)	((flags) = getipl())
#define local_irq_save(flags)	((flags) = __local_irq_save())
#define local_irq_disable()	((void) __local_irq_save())
#define irqs_disabled()		((getipl() & PSR_PIL) != 0)

/* XXX Change this if we ever use a PSO mode kernel. */
#define mb()	__asm__ __volatile__ ("" : : : "memory")
#define rmb()	mb()
#define wmb()	mb()
#define read_barrier_depends()	do { } while(0)
#define set_mb(__var, __value)  do { __var = __value; mb(); } while(0)
#define smp_mb()	__asm__ __volatile__("":::"memory")
#define smp_rmb()	__asm__ __volatile__("":::"memory")
#define smp_wmb()	__asm__ __volatile__("":::"memory")
#define smp_read_barrier_depends()	do { } while(0)

#define nop() __asm__ __volatile__ ("nop")

/* This has special calling conventions */
#ifndef CONFIG_SMP
BTFIXUPDEF_CALL(void, ___xchg32, void)
#endif

static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
{
#ifdef CONFIG_SMP
	__asm__ __volatile__("swap [%2], %0"
			     : "=&r" (val)
			     : "0" (val), "r" (m)
			     : "memory");
	return val;
#else
	register unsigned long *ptr asm("g1");
	register unsigned long ret asm("g2");

	ptr = (unsigned long *) m;
	ret = val;

	/* Note: this is magic and the nop there is
	   really needed. */
	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___f____xchg32\n\t"
	" nop\n\t"
	: "=&r" (ret)
	: "0" (ret), "r" (ptr)
	: "g3", "g4", "g7", "memory", "cc");

	return ret;
#endif
}

#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

extern void __xchg_called_with_bad_pointer(void);

static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
{
	switch (size) {
	case 4:
		return xchg_u32(ptr, x);
	};
	__xchg_called_with_bad_pointer();
	return x;
}

extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));

#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#define arch_align_stack(x) (x)

#endif /* !(__SPARC_SYSTEM_H) */
Commit	Line	Data
1da177e4	1	/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */
1da177e4 LT	2
	3	#ifndef __SPARC_SYSTEM_H
	4	#define __SPARC_SYSTEM_H
	5
1da177e4 LT	6	#include <linux/kernel.h>
	7	#include <linux/threads.h> /* NR_CPUS */
	8	#include <linux/thread_info.h>
	9
1da177e4 LT	10	#include <asm/page.h>
	11	#include <asm/psr.h>
	12	#include <asm/ptrace.h>
	13	#include <asm/btfixup.h>
6e46507d	14	#include <asm/smp.h>
1da177e4 LT	15
	16	#ifndef __ASSEMBLY__
	17
	18	/*
	19	* Sparc (general) CPU types
	20	*/
	21	enum sparc_cpu {
	22	sun4 = 0x00,
	23	sun4c = 0x01,
	24	sun4m = 0x02,
	25	sun4d = 0x03,
	26	sun4e = 0x04,
	27	sun4u = 0x05, /* V8 ploos ploos */
	28	sun_unknown = 0x06,
	29	ap1000 = 0x07, /* almost a sun4m */
	30	};
	31
	32	/* Really, userland should not be looking at any of this... */
	33	#ifdef __KERNEL__
	34
	35	extern enum sparc_cpu sparc_cpu_model;
	36
	37	#ifndef CONFIG_SUN4
	38	#define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c)
	39	#define ARCH_SUN4 0
	40	#else
	41	#define ARCH_SUN4C_SUN4 1
	42	#define ARCH_SUN4 1
	43	#endif
	44
	45	#define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */
	46
	47	extern struct thread_info *current_set[NR_CPUS];
	48
	49	extern unsigned long empty_bad_page;
	50	extern unsigned long empty_bad_page_table;
	51	extern unsigned long empty_zero_page;
	52
	53	extern void sun_do_break(void);
	54	extern int serial_console;
	55	extern int stop_a_enabled;
	56
	57	static __inline__ int con_is_present(void)
	58	{
	59	return serial_console ? 0 : 1;
	60	}
	61
	62	/* When a context switch happens we must flush all user windows so that
	63	* the windows of the current process are flushed onto its stack. This
	64	* way the windows are all clean for the next process and the stack
	65	* frames are up to date.
	66	*/
	67	extern void flush_user_windows(void);
	68	extern void kill_user_windows(void);
	69	extern void synchronize_user_stack(void);
	70	extern void fpsave(unsigned long fpregs, unsigned long fsr,
	71	void fpqueue, unsigned long fpqdepth);
	72
	73	#ifdef CONFIG_SMP
	74	#define SWITCH_ENTER(prv) \
	75	do { \
	76	if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
	77	put_psr(get_psr() \| PSR_EF); \
	78	fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
79	&(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
80	clear_tsk_thread_flag(prv, TIF_USEDFPU); \
81	(prv)->thread.kregs->psr &= ~PSR_EF; \
82	} \
83	} while(0)
84
85	#define SWITCH_DO_LAZY_FPU(next) /* */
86	#else
87	#define SWITCH_ENTER(prv) /* */
88	#define SWITCH_DO_LAZY_FPU(nxt) \
89	do { \
90	if (last_task_used_math != (nxt)) \
91	(nxt)->thread.kregs->psr&=~PSR_EF; \
92	} while(0)
93	#endif
94
95	/*
96	* Flush windows so that the VM switch which follows
97	* would not pull the stack from under us.
98	*
99	* SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
100	* XXX WTF is the above comment? Found in late teen 2.4.x.
101	*/
4866cde0	102	#define prepare_arch_switch(next) do { \
1da177e4 LT	103	__asm__ __volatile__( \
	104	".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
	105	"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
	106	"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
	107	"save %sp, -0x40, %sp\n\t" \
	108	"restore; restore; restore; restore; restore; restore; restore"); \
	109	} while(0)
1da177e4 LT	110
	111	/* Much care has gone into this code, do not touch it.
	112	*
	113	* We need to loadup regs l0/l1 for the newly forked child
	114	* case because the trap return path relies on those registers
	115	* holding certain values, gcc is told that they are clobbered.
	116	* Gcc needs registers for 3 values in and 1 value out, so we
	117	* clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
	118	*
	119	* Hey Dave, that do not touch sign is too much of an incentive
	120	* - Anton & Pete
	121	*/
	122	#define switch_to(prev, next, last) do { \
	123	SWITCH_ENTER(prev); \
	124	SWITCH_DO_LAZY_FPU(next); \
	125	cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask); \
	126	__asm__ __volatile__( \
	127	"sethi %%hi(here - 0x8), %%o7\n\t" \
	128	"mov %%g6, %%g3\n\t" \
	129	"or %%o7, %%lo(here - 0x8), %%o7\n\t" \
	130	"rd %%psr, %%g4\n\t" \
	131	"std %%sp, [%%g6 + %4]\n\t" \
	132	"rd %%wim, %%g5\n\t" \
	133	"wr %%g4, 0x20, %%psr\n\t" \
	134	"nop\n\t" \
	135	"std %%g4, [%%g6 + %3]\n\t" \
	136	"ldd [%2 + %3], %%g4\n\t" \
	137	"mov %2, %%g6\n\t" \
	138	".globl patchme_store_new_current\n" \
	139	"patchme_store_new_current:\n\t" \
	140	"st %2, [%1]\n\t" \
	141	"wr %%g4, 0x20, %%psr\n\t" \
	142	"nop\n\t" \
	143	"nop\n\t" \
	144	"nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \
	145	"ldd [%%g6 + %4], %%sp\n\t" \
	146	"wr %%g5, 0x0, %%wim\n\t" \
	147	"ldd [%%sp + 0x00], %%l0\n\t" \
	148	"ldd [%%sp + 0x38], %%i6\n\t" \
	149	"wr %%g4, 0x0, %%psr\n\t" \
	150	"nop\n\t" \
	151	"nop\n\t" \
	152	"jmpl %%o7 + 0x8, %%g0\n\t" \
	153	" ld [%%g3 + %5], %0\n\t" \
	154	"here:\n" \
	155	: "=&r" (last) \
	156	: "r" (&(current_set[hard_smp_processor_id()])), \
d562ef6a	157	"r" (task_thread_info(next)), \
1da177e4 LT	158	"i" (TI_KPSR), \
	159	"i" (TI_KSP), \
	160	"i" (TI_TASK) \
	161	: "g1", "g2", "g3", "g4", "g5", "g7", \
	162	"l0", "l1", "l3", "l4", "l5", "l6", "l7", \
	163	"i0", "i1", "i2", "i3", "i4", "i5", \
	164	"o0", "o1", "o2", "o3", "o7"); \
	165	} while(0)
	166
	167	/*
	168	* Changing the IRQ level on the Sparc.
	169	*/
	170	extern void local_irq_restore(unsigned long);
	171	extern unsigned long __local_irq_save(void);
	172	extern void local_irq_enable(void);
	173
	174	static inline unsigned long getipl(void)
	175	{
	176	unsigned long retval;
	177
	178	__asm__ __volatile__("rd %%psr, %0" : "=r" (retval));
	179	return retval;
	180	}
	181
	182	#define local_save_flags(flags) ((flags) = getipl())
	183	#define local_irq_save(flags) ((flags) = __local_irq_save())
	184	#define local_irq_disable() ((void) __local_irq_save())
	185	#define irqs_disabled() ((getipl() & PSR_PIL) != 0)
	186
	187	/* XXX Change this if we ever use a PSO mode kernel. */
	188	#define mb() __asm__ __volatile__ ("" : : : "memory")
	189	#define rmb() mb()
	190	#define wmb() mb()
	191	#define read_barrier_depends() do { } while(0)
	192	#define set_mb(__var, __value) do { __var = __value; mb(); } while(0)
1da177e4 LT	193	#define smp_mb() __asm__ __volatile__("":::"memory")
	194	#define smp_rmb() __asm__ __volatile__("":::"memory")
	195	#define smp_wmb() __asm__ __volatile__("":::"memory")
	196	#define smp_read_barrier_depends() do { } while(0)
	197
	198	#define nop() __asm__ __volatile__ ("nop")
	199
	200	/* This has special calling conventions */
	201	#ifndef CONFIG_SMP
	202	BTFIXUPDEF_CALL(void, ___xchg32, void)
	203	#endif
	204
3115624e	205	static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
1da177e4 LT	206	{
	207	#ifdef CONFIG_SMP
	208	__asm__ __volatile__("swap [%2], %0"
	209	: "=&r" (val)
	210	: "0" (val), "r" (m)
	211	: "memory");
	212	return val;
	213	#else
	214	register unsigned long *ptr asm("g1");
	215	register unsigned long ret asm("g2");
	216
	217	ptr = (unsigned long *) m;
	218	ret = val;
	219
	220	/* Note: this is magic and the nop there is
	221	really needed. */
	222	__asm__ __volatile__(
	223	"mov %%o7, %%g4\n\t"
	224	"call ___f____xchg32\n\t"
	225	" nop\n\t"
	226	: "=&r" (ret)
	227	: "0" (ret), "r" (ptr)
	228	: "g3", "g4", "g7", "memory", "cc");
	229
	230	return ret;
	231	#endif
	232	}
	233
	234	#define xchg(ptr,x) ((__typeof__((ptr)))__xchg((unsigned long)(x),(ptr),sizeof((ptr))))
1da177e4 LT	235
	236	extern void __xchg_called_with_bad_pointer(void);
	237
	238	static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
	239	{
	240	switch (size) {
	241	case 4:
	242	return xchg_u32(ptr, x);
	243	};
	244	__xchg_called_with_bad_pointer();
	245	return x;
	246	}
	247
	248	extern void die_if_kernel(char str, struct pt_regs regs) __attribute__ ((noreturn));
	249
	250	#endif /* __KERNEL__ */
	251
	252	#endif /* __ASSEMBLY__ */
	253
	254	#define arch_align_stack(x) (x)
	255
	256	#endif /* !(__SPARC_SYSTEM_H) */