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/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/processor.h"
 *    Copyright (C) 1994, Linus Torvalds
 */

#ifndef __ASM_S390_PROCESSOR_H
#define __ASM_S390_PROCESSOR_H

#include <linux/const.h>

#define CIF_MCCK_PENDING	0	/* machine check handling is pending */
#define CIF_ASCE_PRIMARY	1	/* primary asce needs fixup / uaccess */
#define CIF_ASCE_SECONDARY	2	/* secondary asce needs fixup / uaccess */
#define CIF_NOHZ_DELAY		3	/* delay HZ disable for a tick */
#define CIF_FPU			4	/* restore FPU registers */
#define CIF_IGNORE_IRQ		5	/* ignore interrupt (for udelay) */
#define CIF_ENABLED_WAIT	6	/* in enabled wait state */
#define CIF_MCCK_GUEST		7	/* machine check happening in guest */
#define CIF_DEDICATED_CPU	8	/* this CPU is dedicated */

#define _CIF_MCCK_PENDING	_BITUL(CIF_MCCK_PENDING)
#define _CIF_ASCE_PRIMARY	_BITUL(CIF_ASCE_PRIMARY)
#define _CIF_ASCE_SECONDARY	_BITUL(CIF_ASCE_SECONDARY)
#define _CIF_NOHZ_DELAY		_BITUL(CIF_NOHZ_DELAY)
#define _CIF_FPU		_BITUL(CIF_FPU)
#define _CIF_IGNORE_IRQ		_BITUL(CIF_IGNORE_IRQ)
#define _CIF_ENABLED_WAIT	_BITUL(CIF_ENABLED_WAIT)
#define _CIF_MCCK_GUEST		_BITUL(CIF_MCCK_GUEST)
#define _CIF_DEDICATED_CPU	_BITUL(CIF_DEDICATED_CPU)

#ifndef __ASSEMBLY__

#include <linux/linkage.h>
#include <linux/irqflags.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/runtime_instr.h>
#include <asm/fpu/types.h>
#include <asm/fpu/internal.h>

static inline void set_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags |= (1UL << flag);
}

static inline void clear_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags &= ~(1UL << flag);
}

static inline int test_cpu_flag(int flag)
{
	return !!(S390_lowcore.cpu_flags & (1UL << flag));
}

/*
 * Test CIF flag of another CPU. The caller needs to ensure that
 * CPU hotplug can not happen, e.g. by disabling preemption.
 */
static inline int test_cpu_flag_of(int flag, int cpu)
{
	struct lowcore *lc = lowcore_ptr[cpu];
	return !!(lc->cpu_flags & (1UL << flag));
}

#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })

static inline void get_cpu_id(struct cpuid *ptr)
{
	asm volatile("stidp %0" : "=Q" (*ptr));
}

void s390_adjust_jiffies(void);
void s390_update_cpu_mhz(void);
void cpu_detect_mhz_feature(void);

extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;
extern void execve_tail(void);
extern void __bpon(void);

/*
 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
 */

#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_31BIT) ? \
					(1UL << 31) : -PAGE_SIZE)
#define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_31BIT) ? \
					(1UL << 30) : (1UL << 41))
#define TASK_SIZE		TASK_SIZE_OF(current)
#define TASK_SIZE_MAX		(-PAGE_SIZE)

#define STACK_TOP		(test_thread_flag(TIF_31BIT) ? \
					(1UL << 31) : (1UL << 42))
#define STACK_TOP_MAX		(1UL << 42)

#define HAVE_ARCH_PICK_MMAP_LAYOUT

typedef unsigned int mm_segment_t;

/*
 * Thread structure
 */
struct thread_struct {
	unsigned int  acrs[NUM_ACRS];
        unsigned long ksp;              /* kernel stack pointer             */
	unsigned long user_timer;	/* task cputime in user space */
	unsigned long guest_timer;	/* task cputime in kvm guest */
	unsigned long system_timer;	/* task cputime in kernel space */
	unsigned long hardirq_timer;	/* task cputime in hardirq context */
	unsigned long softirq_timer;	/* task cputime in softirq context */
	unsigned long sys_call_table;	/* system call table address */
	mm_segment_t mm_segment;
	unsigned long gmap_addr;	/* address of last gmap fault. */
	unsigned int gmap_write_flag;	/* gmap fault write indication */
	unsigned int gmap_int_code;	/* int code of last gmap fault */
	unsigned int gmap_pfault;	/* signal of a pending guest pfault */
	/* Per-thread information related to debugging */
	struct per_regs per_user;	/* User specified PER registers */
	struct per_event per_event;	/* Cause of the last PER trap */
	unsigned long per_flags;	/* Flags to control debug behavior */
	unsigned int system_call;	/* system call number in signal */
	unsigned long last_break;	/* last breaking-event-address. */
        /* pfault_wait is used to block the process on a pfault event */
	unsigned long pfault_wait;
	struct list_head list;
	/* cpu runtime instrumentation */
	struct runtime_instr_cb *ri_cb;
	struct gs_cb *gs_cb;		/* Current guarded storage cb */
	struct gs_cb *gs_bc_cb;		/* Broadcast guarded storage cb */
	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
	/*
	 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
	 * the end.
	 */
	struct fpu fpu;			/* FP and VX register save area */
};

/* Flag to disable transactions. */
#define PER_FLAG_NO_TE			1UL
/* Flag to enable random transaction aborts. */
#define PER_FLAG_TE_ABORT_RAND		2UL
/* Flag to specify random transaction abort mode:
 * - abort each transaction at a random instruction before TEND if set.
 * - abort random transactions at a random instruction if cleared.
 */
#define PER_FLAG_TE_ABORT_RAND_TEND	4UL

typedef struct thread_struct thread_struct;

/*
 * Stack layout of a C stack frame.
 */
#ifndef __PACK_STACK
struct stack_frame {
	unsigned long back_chain;
	unsigned long empty1[5];
	unsigned long gprs[10];
	unsigned int  empty2[8];
};
#else
struct stack_frame {
	unsigned long empty1[5];
	unsigned int  empty2[8];
	unsigned long gprs[10];
	unsigned long back_chain;
};
#endif

#define ARCH_MIN_TASKALIGN	8

#define INIT_THREAD {							\
	.ksp = sizeof(init_stack) + (unsigned long) &init_stack,	\
	.fpu.regs = (void *) init_task.thread.fpu.fprs,			\
}

/*
 * Do necessary setup to start up a new thread.
 */
#define start_thread(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;	\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	execve_tail();							\
} while (0)

#define start_thread31(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_BA;			\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	crst_table_downgrade(current->mm);				\
	execve_tail();							\
} while (0)

/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
struct seq_file;
struct pt_regs;

typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
void dump_trace(dump_trace_func_t func, void *data,
		struct task_struct *task, unsigned long sp);
void show_registers(struct pt_regs *regs);

void show_cacheinfo(struct seq_file *m);

/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *tsk) { }

/* Free guarded storage control block */
void guarded_storage_release(struct task_struct *tsk);

unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \
        (task_stack_page(tsk) + THREAD_SIZE) - 1)
#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)
#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15])

/* Has task runtime instrumentation enabled ? */
#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)

static inline unsigned long current_stack_pointer(void)
{
	unsigned long sp;

	asm volatile("la %0,0(15)" : "=a" (sp));
	return sp;
}

static inline unsigned short stap(void)
{
	unsigned short cpu_address;

	asm volatile("stap %0" : "=Q" (cpu_address));
	return cpu_address;
}

/*
 * Give up the time slice of the virtual PU.
 */
#define cpu_relax_yield cpu_relax_yield
void cpu_relax_yield(void);

#define cpu_relax() barrier()

#define ECAG_CACHE_ATTRIBUTE	0
#define ECAG_CPU_ATTRIBUTE	1

static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
{
	unsigned long val;

	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
		     : "=d" (val) : "a" (asi << 8 | parm));
	return val;
}

static inline void psw_set_key(unsigned int key)
{
	asm volatile("spka 0(%0)" : : "d" (key));
}

/*
 * Set PSW to specified value.
 */
static inline void __load_psw(psw_t psw)
{
	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
}

/*
 * Set PSW mask to specified value, while leaving the
 * PSW addr pointing to the next instruction.
 */
static inline void __load_psw_mask(unsigned long mask)
{
	unsigned long addr;
	psw_t psw;

	psw.mask = mask;

	asm volatile(
		"	larl	%0,1f\n"
		"	stg	%0,%O1+8(%R1)\n"
		"	lpswe	%1\n"
		"1:"
		: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
}

/*
 * Extract current PSW mask
 */
static inline unsigned long __extract_psw(void)
{
	unsigned int reg1, reg2;

	asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
	return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
}

static inline void local_mcck_enable(void)
{
	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
}

static inline void local_mcck_disable(void)
{
	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
}

/*
 * Rewind PSW instruction address by specified number of bytes.
 */
static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
{
	unsigned long mask;

	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
	       (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
					  (1UL << 24) - 1;
	return (psw.addr - ilc) & mask;
}

/*
 * Function to stop a processor until the next interrupt occurs
 */
void enabled_wait(void);

/*
 * Function to drop a processor into disabled wait state
 */
static inline void __noreturn disabled_wait(unsigned long code)
{
	psw_t psw;

	psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
	psw.addr = code;
	__load_psw(psw);
	while (1);
}

/*
 * Basic Machine Check/Program Check Handler.
 */

extern void s390_base_mcck_handler(void);
extern void s390_base_pgm_handler(void);
extern void s390_base_ext_handler(void);

extern void (*s390_base_mcck_handler_fn)(void);
extern void (*s390_base_pgm_handler_fn)(void);
extern void (*s390_base_ext_handler_fn)(void);

#define ARCH_LOW_ADDRESS_LIMIT	0x7fffffffUL

extern int memcpy_real(void *, void *, size_t);
extern void memcpy_absolute(void *, void *, size_t);

#define mem_assign_absolute(dest, val) do {			\
	__typeof__(dest) __tmp = (val);				\
								\
	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));		\
	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));	\
} while (0)

extern int s390_isolate_bp(void);
extern int s390_isolate_bp_guest(void);

#endif /* __ASSEMBLY__ */

#endif /* __ASM_S390_PROCESSOR_H */

Filemanager

Name Type Size Permission Actions
fpu Folder 0755
trace Folder 0755
Kbuild File 557 B 0644
airq.h File 3.02 KB 0644
alternative-asm.h File 3.07 KB 0644
alternative.h File 4.99 KB 0644
ap.h File 9.9 KB 0644
appldata.h File 1.54 KB 0644
archrandom.h File 1.17 KB 0644
asm-prototypes.h File 227 B 0644
atomic.h File 5.1 KB 0644
atomic_ops.h File 4.02 KB 0644
barrier.h File 1.84 KB 0644
bitops.h File 10.13 KB 0644
bug.h File 1.49 KB 0644
bugs.h File 441 B 0644
cache.h File 387 B 0644
ccwdev.h File 7.99 KB 0644
ccwgroup.h File 2.53 KB 0644
checksum.h File 3.24 KB 0644
chpid.h File 974 B 0644
cio.h File 8.01 KB 0644
clp.h File 1.32 KB 0644
cmb.h File 425 B 0644
cmpxchg.h File 1.76 KB 0644
compat.h File 7.9 KB 0644
cpacf.h File 16.8 KB 0644
cpcmd.h File 1.11 KB 0644
cpu.h File 549 B 0644
cpu_mf.h File 8.99 KB 0644
cpufeature.h File 963 B 0644
cputime.h File 805 B 0644
crw.h File 1.86 KB 0644
css_chars.h File 769 B 0644
ctl_reg.h File 2.89 KB 0644
current.h File 405 B 0644
debug.h File 8.1 KB 0644
delay.h File 721 B 0644
diag.h File 5.94 KB 0644
dis.h File 637 B 0644
dma-mapping.h File 621 B 0644
dma.h File 456 B 0644
eadm.h File 2.03 KB 0644
ebcdic.h File 1.41 KB 0644
elf.h File 10.36 KB 0644
exec.h File 269 B 0644
extable.h File 875 B 0644
extmem.h File 804 B 0644
facility.h File 2.44 KB 0644
fcx.h File 7.91 KB 0644
ftrace.h File 1.66 KB 0644
futex.h File 2.09 KB 0644
gmap.h File 4.93 KB 0644
hardirq.h File 670 B 0644
hugetlb.h File 2.87 KB 0644
hw_irq.h File 249 B 0644
idals.h File 5.22 KB 0644
idle.h File 709 B 0644
io.h File 2.03 KB 0644
ipl.h File 3.6 KB 0644
irq.h File 2.55 KB 0644
irqflags.h File 1.76 KB 0644
isc.h File 1000 B 0644
itcw.h File 950 B 0644
jump_label.h File 1.36 KB 0644
kdebug.h File 386 B 0644
kexec.h File 1.32 KB 0644
kprobes.h File 2.24 KB 0644
kvm_host.h File 22.24 KB 0644
kvm_para.h File 5.78 KB 0644
linkage.h File 633 B 0644
livepatch.h File 461 B 0644
lowcore.h File 6.29 KB 0644
mmu.h File 1.19 KB 0644
mmu_context.h File 3.84 KB 0644
mmzone.h File 316 B 0644
module.h File 802 B 0644
nmi.h File 3.44 KB 0644
nospec-branch.h File 342 B 0644
nospec-insn.h File 3.81 KB 0644
numa.h File 730 B 0644
os_info.h File 1.1 KB 0644
page-states.h File 486 B 0644
page.h File 5.12 KB 0644
pci.h File 6.26 KB 0644
pci_clp.h File 4.25 KB 0644
pci_debug.h File 608 B 0644
pci_dma.h File 5.7 KB 0644
pci_insn.h File 2.59 KB 0644
pci_io.h File 4.58 KB 0644
percpu.h File 6.44 KB 0644
perf_event.h File 2.71 KB 0644
pgalloc.h File 4.32 KB 0644
pgtable.h File 47.7 KB 0644
pkey.h File 4.23 KB 0644
preempt.h File 3.25 KB 0644
processor.h File 10.42 KB 0644
ptrace.h File 5.27 KB 0644
qdio.h File 11.67 KB 0644
reset.h File 471 B 0644
runtime_instr.h File 1.76 KB 0644
schid.h File 525 B 0644
sclp.h File 3.38 KB 0644
scsw.h File 24.1 KB 0644
seccomp.h File 516 B 0644
sections.h File 155 B 0644
segment.h File 93 B 0644
serial.h File 147 B 0644
set_memory.h File 779 B 0644
setup.h File 4.44 KB 0644
shmparam.h File 285 B 0644
signal.h File 644 B 0644
sigp.h File 1.8 KB 0644
smp.h File 2.45 KB 0644
sparsemem.h File 214 B 0644
spinlock.h File 3.53 KB 0644
spinlock_types.h File 437 B 0644
stp.h File 1.26 KB 0644
string.h File 4.5 KB 0644
switch_to.h File 1.37 KB 0644
syscall.h File 2.63 KB 0644
sysinfo.h File 4.22 KB 0644
termios.h File 685 B 0644
thread_info.h File 3.15 KB 0644
timex.h File 6.15 KB 0644
tlb.h File 5.71 KB 0644
tlbflush.h File 3.52 KB 0644
topology.h File 2.69 KB 0644
uaccess.h File 6.57 KB 0644
unistd.h File 1.03 KB 0644
uprobes.h File 588 B 0644
user.h File 3.3 KB 0644
vdso.h File 1.8 KB 0644
vga.h File 170 B 0644
vtime.h File 182 B 0644
vtimer.h File 866 B 0644
vx-insn.h File 10.66 KB 0644
xor.h File 454 B 0644