cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

timer_64.h (2448B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* timer.h: System timer definitions for sun5.
      3 *
      4 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
      5 */
      6
      7#ifndef _SPARC64_TIMER_H
      8#define _SPARC64_TIMER_H
      9
     10#include <uapi/asm/asi.h>
     11#include <linux/types.h>
     12#include <linux/init.h>
     13
     14/* The most frequently accessed fields should be first,
     15 * to fit into the same cacheline.
     16 */
     17struct sparc64_tick_ops {
     18	unsigned long ticks_per_nsec_quotient;
     19	unsigned long offset;
     20	unsigned long long (*get_tick)(void);
     21	int (*add_compare)(unsigned long);
     22	unsigned long softint_mask;
     23	void (*disable_irq)(void);
     24
     25	void (*init_tick)(void);
     26	unsigned long (*add_tick)(unsigned long);
     27	unsigned long (*get_frequency)(void);
     28	unsigned long frequency;
     29
     30	char *name;
     31};
     32
     33extern struct sparc64_tick_ops *tick_ops;
     34
     35unsigned long sparc64_get_clock_tick(unsigned int cpu);
     36void setup_sparc64_timer(void);
     37void __init time_init(void);
     38
     39#define TICK_PRIV_BIT		BIT(63)
     40#define TICKCMP_IRQ_BIT		BIT(63)
     41
     42#define HBIRD_STICKCMP_ADDR	0x1fe0000f060UL
     43#define HBIRD_STICK_ADDR	0x1fe0000f070UL
     44
     45#define GET_TICK_NINSTR		13
     46struct get_tick_patch {
     47	unsigned int	addr;
     48	unsigned int	tick[GET_TICK_NINSTR];
     49	unsigned int	stick[GET_TICK_NINSTR];
     50};
     51
     52extern struct get_tick_patch __get_tick_patch;
     53extern struct get_tick_patch __get_tick_patch_end;
     54
     55static inline unsigned long get_tick(void)
     56{
     57	unsigned long tick, tmp1, tmp2;
     58
     59	__asm__ __volatile__(
     60	/* read hbtick 13 instructions */
     61	"661:\n"
     62	"	mov	0x1fe, %1\n"
     63	"	sllx	%1, 0x20, %1\n"
     64	"	sethi	%%hi(0xf000), %2\n"
     65	"	or	%2, 0x70, %2\n"
     66	"	or	%1, %2, %1\n"	/* %1 = HBIRD_STICK_ADDR */
     67	"	add	%1, 8, %2\n"
     68	"	ldxa	[%2]%3, %0\n"
     69	"	ldxa	[%1]%3, %1\n"
     70	"	ldxa	[%2]%3, %2\n"
     71	"	sub	%2, %0, %0\n"	/* don't modify %xcc */
     72	"	brnz,pn	%0, 661b\n"	/* restart to save one register */
     73	"	 sllx	%2, 32, %2\n"
     74	"	or	%2, %1, %0\n"
     75	/* Common/not patched code */
     76	"	sllx	%0, 1, %0\n"
     77	"	srlx	%0, 1, %0\n"	/* Clear TICK_PRIV_BIT */
     78	/* Beginning of patch section */
     79	"	.section .get_tick_patch, \"ax\"\n"
     80	"	.word	661b\n"
     81	/* read tick 2 instructions and 11 skipped */
     82	"	ba	1f\n"
     83	"	 rd	%%tick, %0\n"
     84	"	.skip	4 * (%4 - 2)\n"
     85	"1:\n"
     86	/* read stick 2 instructions and 11 skipped */
     87	"	ba	1f\n"
     88	"	 rd	%%asr24, %0\n"
     89	"	.skip	4 * (%4 - 2)\n"
     90	"1:\n"
     91	/* End of patch section */
     92	"	.previous\n"
     93	: "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
     94	: "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
     95
     96	return tick;
     97}
     98
     99#endif /* _SPARC64_TIMER_H */