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usr
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src
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linux-headers-6.8.0-36
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arch
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sparc
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include
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asm
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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 <uapi/asm/asi.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); #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; } #endif /* _SPARC64_TIMER_H */
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