FM / asm

/usr/src/linux-headers-5.15.0-181/arch/s390/include/asm/

/usr/src/linux-headers-5.15.0-181/arch/s390/include/asm

Name	Size	Mode	Actions
fpu/	-	0755	rm
trace/	-	0755	rm
vdso/	-	0755	rm
airq.h	3421	0644	edit dl rm
alternative-asm.h	3148	0644	edit dl rm
alternative.h	5742	0644	edit dl rm
ap.h	13098	0644	edit dl rm
appldata.h	1593	0644	edit dl rm
archrandom.h	1319	0644	edit dl rm
asm-const.h	376	0644	edit dl rm
asm-prototypes.h	227	0644	edit dl rm
atomic.h	4225	0644	edit dl rm
atomic_ops.h	5100	0644	edit dl rm
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chpid.h	979	0644	edit dl rm
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cio.h	9083	0644	edit dl rm
clocksource.h	184	0644	edit dl rm
clp.h	1426	0644	edit dl rm
cmb.h	425	0644	edit dl rm
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cpu.h	549	0644	edit dl rm
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ftrace.h	1875	0644	edit dl rm
ftrace.lds.h	720	0644	edit dl rm
futex.h	1927	0644	edit dl rm
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hardirq.h	777	0644	edit dl rm
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idals.h	5317	0644	edit dl rm
idle.h	753	0644	edit dl rm
io.h	2153	0644	edit dl rm
ipl.h	3708	0644	edit dl rm
irq.h	2635	0644	edit dl rm
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isc.h	1036	0644	edit dl rm
itcw.h	950	0644	edit dl rm
jump_label.h	1411	0644	edit dl rm
kasan.h	1772	0644	edit dl rm
Kbuild	253	0644	edit dl rm
kdebug.h	386	0644	edit dl rm
kexec.h	2620	0644	edit dl rm
kfence.h	1148	0644	edit dl rm
kprobes.h	2175	0644	edit dl rm
kvm_host.h	27155	0644	edit dl rm
kvm_para.h	3761	0644	edit dl rm
linkage.h	729	0644	edit dl rm
livepatch.h	474	0644	edit dl rm
lowcore.h	6595	0644	edit dl rm
mem_detect.h	2589	0644	edit dl rm
mem_encrypt.h	365	0644	edit dl rm
mmu.h	1515	0644	edit dl rm
mmu_context.h	3491	0644	edit dl rm
mmzone.h	316	0644	edit dl rm
module.h	1209	0644	edit dl rm
nmi.h	3698	0644	edit dl rm
nospec-branch.h	342	0644	edit dl rm
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numa.h	386	0644	edit dl rm
os_info.h	1136	0644	edit dl rm
page-states.h	486	0644	edit dl rm
page.h	5194	0644	edit dl rm
pci.h	8691	0644	edit dl rm
pci_clp.h	5346	0644	edit dl rm
pci_debug.h	608	0644	edit dl rm
pci_dma.h	5541	0644	edit dl rm
pci_insn.h	4089	0644	edit dl rm
pci_io.h	4405	0644	edit dl rm
percpu.h	6638	0644	edit dl rm
perf_event.h	3245	0644	edit dl rm
pgalloc.h	4024	0644	edit dl rm
pgtable.h	51845	0644	edit dl rm
pkey.h	737	0644	edit dl rm
pnet.h	325	0644	edit dl rm
preempt.h	3218	0644	edit dl rm
processor.h	9637	0644	edit dl rm
ptdump.h	255	0644	edit dl rm
ptrace.h	5865	0644	edit dl rm
purgatory.h	329	0644	edit dl rm
qdio.h	10011	0644	edit dl rm
runtime_instr.h	634	0644	edit dl rm
schid.h	525	0644	edit dl rm
sclp.h	4332	0644	edit dl rm
scsw.h	24630	0644	edit dl rm
seccomp.h	808	0644	edit dl rm
sections.h	1357	0644	edit dl rm
serial.h	147	0644	edit dl rm
setup.h	5156	0644	edit dl rm
set_memory.h	989	0644	edit dl rm
shmparam.h	285	0644	edit dl rm
signal.h	644	0644	edit dl rm
sigp.h	1900	0644	edit dl rm
smp.h	1932	0644	edit dl rm
softirq_stack.h	329	0644	edit dl rm
sparsemem.h	214	0644	edit dl rm
spinlock.h	3525	0644	edit dl rm
spinlock_types.h	407	0644	edit dl rm
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string.h	5847	0644	edit dl rm
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termios.h	685	0644	edit dl rm
thread_info.h	3605	0644	edit dl rm
timex.h	6538	0644	edit dl rm
tlb.h	4296	0644	edit dl rm
tlbflush.h	3233	0644	edit dl rm
topology.h	2876	0644	edit dl rm
tpi.h	736	0644	edit dl rm
types.h	318	0644	edit dl rm
uaccess.h	10049	0644	edit dl rm
unistd.h	1030	0644	edit dl rm
unwind.h	3360	0644	edit dl rm
uprobes.h	588	0644	edit dl rm
user.h	3384	0644	edit dl rm
uv.h	10977	0644	edit dl rm
vdso.h	746	0644	edit dl rm
vga.h	170	0644	edit dl rm
vmalloc.h	90	0644	edit dl rm
vmlinux.lds.h	1167	0644	edit dl rm
vtime.h	718	0644	edit dl rm
vtimer.h	830	0644	edit dl rm
vx-insn.h	13477	0644	edit dl rm
xor.h	454	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/s390/include/asm/timex.h (6538B)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *
 *  Derived from "include/asm-i386/timex.h"
 *    Copyright (C) 1992, Linus Torvalds
 */

#ifndef _ASM_S390_TIMEX_H
#define _ASM_S390_TIMEX_H

#include <linux/preempt.h>
#include <linux/time64.h>
#include <asm/lowcore.h>

/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL

extern u64 clock_comparator_max;

union tod_clock {
	__uint128_t val;
	struct {
		__uint128_t ei	:  8; /* epoch index */
		__uint128_t tod : 64; /* bits 0-63 of tod clock */
		__uint128_t	: 40;
		__uint128_t pf	: 16; /* programmable field */
	};
	struct {
		__uint128_t eitod : 72; /* epoch index + bits 0-63 tod clock */
		__uint128_t	  : 56;
	};
	struct {
		__uint128_t us	: 60; /* micro-seconds */
		__uint128_t sus	: 12; /* sub-microseconds */
		__uint128_t	: 56;
	};
} __packed;

/* Inline functions for clock register access. */
static inline int set_tod_clock(__u64 time)
{
	int cc;

asm volatile(
		"   sck   %1\n"
		"   ipm   %0\n"
		"   srl   %0,28\n"
		: "=d" (cc) : "Q" (time) : "cc");
	return cc;
}

static inline int store_tod_clock_ext_cc(union tod_clock *clk)
{
	int cc;

asm volatile(
		"   stcke  %1\n"
		"   ipm   %0\n"
		"   srl   %0,28\n"
		: "=d" (cc), "=Q" (*clk) : : "cc");
	return cc;
}

static inline void store_tod_clock_ext(union tod_clock *tod)
{
	asm volatile("stcke %0" : "=Q" (*tod) : : "cc");
}

static inline void set_clock_comparator(__u64 time)
{
	asm volatile("sckc %0" : : "Q" (time));
}

static inline void set_tod_programmable_field(u16 val)
{
	asm volatile(
		"	lgr	0,%[val]\n"
		"	sckpf\n"
		:
		: [val] "d" ((unsigned long)val)
		: "0");
}

void clock_comparator_work(void);

void __init time_early_init(void);

extern unsigned char ptff_function_mask[16];

/* Function codes for the ptff instruction. */
#define PTFF_QAF	0x00	/* query available functions */
#define PTFF_QTO	0x01	/* query tod offset */
#define PTFF_QSI	0x02	/* query steering information */
#define PTFF_QUI	0x04	/* query UTC information */
#define PTFF_ATO	0x40	/* adjust tod offset */
#define PTFF_STO	0x41	/* set tod offset */
#define PTFF_SFS	0x42	/* set fine steering rate */
#define PTFF_SGS	0x43	/* set gross steering rate */

/* Query TOD offset result */
struct ptff_qto {
	unsigned long physical_clock;
	unsigned long tod_offset;
	unsigned long logical_tod_offset;
	unsigned long tod_epoch_difference;
} __packed;

static inline int ptff_query(unsigned int nr)
{
	unsigned char *ptr;

ptr = ptff_function_mask + (nr >> 3);
	return (*ptr & (0x80 >> (nr & 7))) != 0;
}

/* Query UTC information result */
struct ptff_qui {
	unsigned int tm : 2;
	unsigned int ts : 2;
	unsigned int : 28;
	unsigned int pad_0x04;
	unsigned long leap_event;
	short old_leap;
	short new_leap;
	unsigned int pad_0x14;
	unsigned long prt[5];
	unsigned long cst[3];
	unsigned int skew;
	unsigned int pad_0x5c[41];
} __packed;

/*
 * ptff - Perform timing facility function
 * @ptff_block: Pointer to ptff parameter block
 * @len: Length of parameter block
 * @func: Function code
 * Returns: Condition code (0 on success)
 */
#define ptff(ptff_block, len, func)					\
({									\
	struct addrtype { char _[len]; };				\
	unsigned int reg0 = func;					\
	unsigned long reg1 = (unsigned long)(ptff_block);		\
	int rc;								\
									\
	asm volatile(							\
		"	lgr	0,%[reg0]\n"				\
		"	lgr	1,%[reg1]\n"				\
		"	.insn	e,0x0104\n"				\
		"	ipm	%[rc]\n"				\
		"	srl	%[rc],28\n"				\
		: [rc] "=&d" (rc), "+m" (*(struct addrtype *)reg1)	\
		: [reg0] "d" (reg0), [reg1] "d" (reg1)			\
		: "cc", "0", "1");					\
	rc;								\
})

static inline unsigned long local_tick_disable(void)
{
	unsigned long old;

old = S390_lowcore.clock_comparator;
	S390_lowcore.clock_comparator = clock_comparator_max;
	set_clock_comparator(S390_lowcore.clock_comparator);
	return old;
}

static inline void local_tick_enable(unsigned long comp)
{
	S390_lowcore.clock_comparator = comp;
	set_clock_comparator(S390_lowcore.clock_comparator);
}

#define CLOCK_TICK_RATE		1193180 /* Underlying HZ */

typedef unsigned long cycles_t;

static inline unsigned long get_tod_clock(void)
{
	union tod_clock clk;

store_tod_clock_ext(&clk);
	return clk.tod;
}

static inline unsigned long get_tod_clock_fast(void)
{
#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
	unsigned long clk;

asm volatile("stckf %0" : "=Q" (clk) : : "cc");
	return clk;
#else
	return get_tod_clock();
#endif
}
int get_phys_clock(unsigned long *clock);
void init_cpu_timer(void);

extern union tod_clock tod_clock_base;

/**
 * get_clock_monotonic - returns current time in clock rate units
 *
 * The clock and tod_clock_base get changed via stop_machine.
 * Therefore preemption must be disabled, otherwise the returned
 * value is not guaranteed to be monotonic.
 */
static inline unsigned long get_tod_clock_monotonic(void)
{
	unsigned long tod;

preempt_disable_notrace();
	tod = get_tod_clock() - tod_clock_base.tod;
	preempt_enable_notrace();
	return tod;
}

static inline cycles_t get_cycles(void)
{
	return (cycles_t)get_tod_clock_monotonic() >> 2;
}
#define get_cycles get_cycles

/**
 * tod_to_ns - convert a TOD format value to nanoseconds
 * @todval: to be converted TOD format value
 * Returns: number of nanoseconds that correspond to the TOD format value
 *
 * Converting a 64 Bit TOD format value to nanoseconds means that the value
 * must be divided by 4.096. In order to achieve that we multiply with 125
 * and divide by 512:
 *
 *    ns = (todval * 125) >> 9;
 *
 * In order to avoid an overflow with the multiplication we can rewrite this.
 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
 * we end up with
 *
 *    ns = ((2^9 * th + tl) * 125 ) >> 9;
 * -> ns = (th * 125) + ((tl * 125) >> 9);
 *
 */
static inline unsigned long tod_to_ns(unsigned long todval)
{
	return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
}

/**
 * tod_after - compare two 64 bit TOD values
 * @a: first 64 bit TOD timestamp
 * @b: second 64 bit TOD timestamp
 *
 * Returns: true if a is later than b
 */
static inline int tod_after(unsigned long a, unsigned long b)
{
	if (MACHINE_HAS_SCC)
		return (long) a > (long) b;
	return a > b;
}

/**
 * tod_after_eq - compare two 64 bit TOD values
 * @a: first 64 bit TOD timestamp
 * @b: second 64 bit TOD timestamp
 *
 * Returns: true if a is later than b
 */
static inline int tod_after_eq(unsigned long a, unsigned long b)
{
	if (MACHINE_HAS_SCC)
		return (long) a >= (long) b;
	return a >= b;
}

#endif

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