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99 lines
2.4 KiB
99 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* timer.h: System timer definitions for sun5. |
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* |
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* Copyright (C) 1997, 2008 David S. Miller ([email protected]) |
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*/ |
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#ifndef _SPARC64_TIMER_H |
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#define _SPARC64_TIMER_H |
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#include <uapi/asm/asi.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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/* The most frequently accessed fields should be first, |
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* to fit into the same cacheline. |
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*/ |
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struct sparc64_tick_ops { |
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unsigned long ticks_per_nsec_quotient; |
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unsigned long offset; |
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unsigned long long (*get_tick)(void); |
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int (*add_compare)(unsigned long); |
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unsigned long softint_mask; |
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void (*disable_irq)(void); |
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void (*init_tick)(void); |
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unsigned long (*add_tick)(unsigned long); |
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unsigned long (*get_frequency)(void); |
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unsigned long frequency; |
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char *name; |
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}; |
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extern struct sparc64_tick_ops *tick_ops; |
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unsigned long sparc64_get_clock_tick(unsigned int cpu); |
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void setup_sparc64_timer(void); |
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void __init time_init(void); |
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#define TICK_PRIV_BIT BIT(63) |
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#define TICKCMP_IRQ_BIT BIT(63) |
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#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL |
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#define HBIRD_STICK_ADDR 0x1fe0000f070UL |
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#define GET_TICK_NINSTR 13 |
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struct get_tick_patch { |
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unsigned int addr; |
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unsigned int tick[GET_TICK_NINSTR]; |
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unsigned int stick[GET_TICK_NINSTR]; |
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}; |
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extern struct get_tick_patch __get_tick_patch; |
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extern struct get_tick_patch __get_tick_patch_end; |
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static inline unsigned long get_tick(void) |
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{ |
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unsigned long tick, tmp1, tmp2; |
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__asm__ __volatile__( |
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/* read hbtick 13 instructions */ |
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"661:\n" |
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" mov 0x1fe, %1\n" |
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" sllx %1, 0x20, %1\n" |
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" sethi %%hi(0xf000), %2\n" |
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" or %2, 0x70, %2\n" |
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" or %1, %2, %1\n" /* %1 = HBIRD_STICK_ADDR */ |
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" add %1, 8, %2\n" |
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" ldxa [%2]%3, %0\n" |
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" ldxa [%1]%3, %1\n" |
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" ldxa [%2]%3, %2\n" |
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" sub %2, %0, %0\n" /* don't modify %xcc */ |
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" brnz,pn %0, 661b\n" /* restart to save one register */ |
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" sllx %2, 32, %2\n" |
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" or %2, %1, %0\n" |
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/* Common/not patched code */ |
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" sllx %0, 1, %0\n" |
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" srlx %0, 1, %0\n" /* Clear TICK_PRIV_BIT */ |
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/* Beginning of patch section */ |
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" .section .get_tick_patch, \"ax\"\n" |
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" .word 661b\n" |
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/* read tick 2 instructions and 11 skipped */ |
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" ba 1f\n" |
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" rd %%tick, %0\n" |
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" .skip 4 * (%4 - 2)\n" |
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"1:\n" |
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/* read stick 2 instructions and 11 skipped */ |
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" ba 1f\n" |
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" rd %%asr24, %0\n" |
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" .skip 4 * (%4 - 2)\n" |
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"1:\n" |
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/* End of patch section */ |
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" .previous\n" |
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: "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2) |
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: "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR)); |
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return tick; |
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} |
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#endif /* _SPARC64_TIMER_H */
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