Release 4.14 arch/sparc/include/asm/timer_64.h

/* SPDX-License-Identifier: GPL-2.0 */
/* timer.h: System timer definitions for sun5.
 *
 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
 */

#ifndef _SPARC64_TIMER_H

#define _SPARC64_TIMER_H

#include <linux/types.h>
#include <linux/init.h>

/* The most frequently accessed fields should be first,
 * to fit into the same cacheline.
 */

struct sparc64_tick_ops {
	
unsigned long ticks_per_nsec_quotient;
	
unsigned long offset;
	
unsigned long long (*get_tick)(void);
	
int (*add_compare)(unsigned long);
	
unsigned long softint_mask;
	
void (*disable_irq)(void);

	
void (*init_tick)(void);
	
unsigned long (*add_tick)(unsigned long);
	
unsigned long (*get_frequency)(void);
	
unsigned long frequency;

	
char *name;
};

extern struct sparc64_tick_ops *tick_ops;

unsigned long sparc64_get_clock_tick(unsigned int cpu);
void setup_sparc64_timer(void);
void __init time_init(void);


#define TICK_PRIV_BIT		BIT(63)

#define TICKCMP_IRQ_BIT		BIT(63)


#define HBIRD_STICKCMP_ADDR	0x1fe0000f060UL

#define HBIRD_STICK_ADDR	0x1fe0000f070UL


#define GET_TICK_NINSTR		13

struct get_tick_patch {
	
unsigned int	addr;
	
unsigned int	tick[GET_TICK_NINSTR];
	
unsigned int	stick[GET_TICK_NINSTR];
};

extern struct get_tick_patch __get_tick_patch;
extern struct get_tick_patch __get_tick_patch_end;



static inline unsigned long get_tick(void)
{
	unsigned long tick, tmp1, tmp2;

	__asm__ __volatile__(
	/* read hbtick 13 instructions */
	"661:\n"
        "       mov     0x1fe, %1\n"
        "       sllx    %1, 0x20, %1\n"
        "       sethi   %%hi(0xf000), %2\n"
        "       or      %2, 0x70, %2\n"
        "       or      %1, %2, %1\n"	/* %1 = HBIRD_STICK_ADDR */
	"       add     %1, 8, %2\n"
        "       ldxa    [%2]%3, %0\n"
        "       ldxa    [%1]%3, %1\n"
        "       ldxa    [%2]%3, %2\n"
        "       sub     %2, %0, %0\n"	/* don't modify %xcc */
	"       brnz,pn %0, 661b\n"	/* restart to save one register */
	"        sllx   %2, 32, %2\n"
        "       or      %2, %1, %0\n"
	/* Common/not patched code */
	"       sllx    %0, 1, %0\n"
        "       srlx    %0, 1, %0\n"	/* Clear TICK_PRIV_BIT */
	/* Beginning of patch section */
	"       .section .get_tick_patch, \"ax\"\n"
        "       .word   661b\n"
	/* read tick 2 instructions and 11 skipped */
	"       ba      1f\n"
        "        rd     %%tick, %0\n"
        "       .skip   4 * (%4 - 2)\n"
        "1:\n"
	/* read stick 2 instructions and 11 skipped */
	"       ba      1f\n"
        "        rd     %%asr24, %0\n"
        "       .skip   4 * (%4 - 2)\n"
        "1:\n"
	/* End of patch section */
	"       .previous\n"
        : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
        : "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));

	return tick;
}

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#endif /* _SPARC64_TIMER_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Tatashin
119
52.42%
3
50.00%
Sam Ravnborg
107
47.14%
2
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Greg Kroah-Hartman
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0.44%
1
16.67%
Total
227
100.00%
6
100.00%
Directory: arch/sparc/include/asm

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