Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* timer.h: System timer definitions for sun5.
2 *
3 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
4 */
5
6#ifndef _SPARC64_TIMER_H
7#define _SPARC64_TIMER_H
8
9#include <linux/types.h>
10#include <linux/init.h>
11
12/* The most frequently accessed fields should be first,
13 * to fit into the same cacheline.
14 */
15struct sparc64_tick_ops {
16 unsigned long ticks_per_nsec_quotient;
17 unsigned long offset;
18 unsigned long long (*get_tick)(void);
19 int (*add_compare)(unsigned long);
20 unsigned long softint_mask;
21 void (*disable_irq)(void);
22
23 void (*init_tick)(void);
24 unsigned long (*add_tick)(unsigned long);
25 unsigned long (*get_frequency)(void);
26 unsigned long frequency;
27
28 char *name;
29};
30
31extern struct sparc64_tick_ops *tick_ops;
32
33unsigned long sparc64_get_clock_tick(unsigned int cpu);
34void setup_sparc64_timer(void);
35void __init time_init(void);
36
37#define TICK_PRIV_BIT BIT(63)
38#define TICKCMP_IRQ_BIT BIT(63)
39
40#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
41#define HBIRD_STICK_ADDR 0x1fe0000f070UL
42
43#define GET_TICK_NINSTR 13
44struct get_tick_patch {
45 unsigned int addr;
46 unsigned int tick[GET_TICK_NINSTR];
47 unsigned int stick[GET_TICK_NINSTR];
48};
49
50extern struct get_tick_patch __get_tick_patch;
51extern struct get_tick_patch __get_tick_patch_end;
52
53static inline unsigned long get_tick(void)
54{
55 unsigned long tick, tmp1, tmp2;
56
57 __asm__ __volatile__(
58 /* read hbtick 13 instructions */
59 "661:\n"
60 " mov 0x1fe, %1\n"
61 " sllx %1, 0x20, %1\n"
62 " sethi %%hi(0xf000), %2\n"
63 " or %2, 0x70, %2\n"
64 " or %1, %2, %1\n" /* %1 = HBIRD_STICK_ADDR */
65 " add %1, 8, %2\n"
66 " ldxa [%2]%3, %0\n"
67 " ldxa [%1]%3, %1\n"
68 " ldxa [%2]%3, %2\n"
69 " sub %2, %0, %0\n" /* don't modify %xcc */
70 " brnz,pn %0, 661b\n" /* restart to save one register */
71 " sllx %2, 32, %2\n"
72 " or %2, %1, %0\n"
73 /* Common/not patched code */
74 " sllx %0, 1, %0\n"
75 " srlx %0, 1, %0\n" /* Clear TICK_PRIV_BIT */
76 /* Beginning of patch section */
77 " .section .get_tick_patch, \"ax\"\n"
78 " .word 661b\n"
79 /* read tick 2 instructions and 11 skipped */
80 " ba 1f\n"
81 " rd %%tick, %0\n"
82 " .skip 4 * (%4 - 2)\n"
83 "1:\n"
84 /* read stick 2 instructions and 11 skipped */
85 " ba 1f\n"
86 " rd %%asr24, %0\n"
87 " .skip 4 * (%4 - 2)\n"
88 "1:\n"
89 /* End of patch section */
90 " .previous\n"
91 : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
92 : "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
93
94 return tick;
95}
96
97#endif /* _SPARC64_TIMER_H */