diff options
Diffstat (limited to 'arch/sparc/include/asm/timer_64.h')
| -rw-r--r-- | arch/sparc/include/asm/timer_64.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/timer_64.h b/arch/sparc/include/asm/timer_64.h index fce4150..51bc3bc 100644 --- a/arch/sparc/include/asm/timer_64.h +++ b/arch/sparc/include/asm/timer_64.h @@ -9,7 +9,12 @@ #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; @@ -17,6 +22,8 @@ struct sparc64_tick_ops { void (*init_tick)(void); unsigned long (*add_tick)(unsigned long); + unsigned long (*get_frequency)(void); + unsigned long frequency; char *name; }; @@ -27,4 +34,64 @@ 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; +} + #endif /* _SPARC64_TIMER_H */ |
