/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 2002, 2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#include <linux/bits.h>
#include <vdso/page.h>

/*
 * General size of kernel stacks
 */
#if defined(CONFIG_KASAN) || defined(CONFIG_KMSAN)
#define THREAD_SIZE_ORDER 4
#else
#define THREAD_SIZE_ORDER 2
#endif
#define BOOT_STACK_SIZE (PAGE_SIZE << 2)
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)

#define STACK_INIT_OFFSET (THREAD_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)

#ifndef __ASSEMBLER__

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants must also be changed
 */
struct thread_info {
        unsigned long           flags;          /* low level flags */
        unsigned long           syscall_work;   /* SYSCALL_WORK_ flags */
        unsigned int            cpu;            /* current CPU */
        unsigned char           sie;            /* running in SIE context */
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)                   \
{                                               \
        .flags          = 0,                    \
}

struct task_struct;

void arch_setup_new_exec(void);
#define arch_setup_new_exec arch_setup_new_exec

#endif

/*
 * thread information flags bit numbers
 *
 * Tell the generic TIF infrastructure which special bits s390 supports
 */
#define HAVE_TIF_NEED_RESCHED_LAZY
#define HAVE_TIF_RESTORE_SIGMASK

#include <asm-generic/thread_info_tif.h>

/* Architecture specific bits */
#define TIF_ASCE_PRIMARY        16      /* primary asce is kernel asce */
#define TIF_GUARDED_STORAGE     17      /* load guarded storage control block */
#define TIF_ISOLATE_BP_GUEST    18      /* Run KVM guests with isolated BP */
#define TIF_PER_TRAP            19      /* Need to handle PER trap on exit to usermode */
#define TIF_SINGLE_STEP         21      /* This task is single stepped */
#define TIF_BLOCK_STEP          22      /* This task is block stepped */
#define TIF_UPROBE_SINGLESTEP   23      /* This task is uprobe single stepped */

#define _TIF_ASCE_PRIMARY       BIT(TIF_ASCE_PRIMARY)
#define _TIF_GUARDED_STORAGE    BIT(TIF_GUARDED_STORAGE)
#define _TIF_ISOLATE_BP_GUEST   BIT(TIF_ISOLATE_BP_GUEST)
#define _TIF_PER_TRAP           BIT(TIF_PER_TRAP)
#define _TIF_SINGLE_STEP        BIT(TIF_SINGLE_STEP)
#define _TIF_BLOCK_STEP         BIT(TIF_BLOCK_STEP)
#define _TIF_UPROBE_SINGLESTEP  BIT(TIF_UPROBE_SINGLESTEP)

#endif /* _ASM_THREAD_INFO_H */