/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_PAGE_64_H
#define _ASM_POWERPC_PAGE_64_H

/*
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 */

#include <asm/asm-const.h>

/*
 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
 * specific, every notion of page number shared with the firmware, TCEs,
 * iommu, etc... still uses a page size of 4K.
 */
#define HW_PAGE_SHIFT           12
#define HW_PAGE_SIZE            (ASM_CONST(1) << HW_PAGE_SHIFT)
#define HW_PAGE_MASK            (~(HW_PAGE_SIZE-1))

/*
 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
 * HW_PAGE_SHIFT, that is 4K pages.
 */
#define PAGE_FACTOR             (PAGE_SHIFT - HW_PAGE_SHIFT)

/* Segment size; normal 256M segments */
#define SID_SHIFT               28
#define SID_MASK                ASM_CONST(0xfffffffff)
#define ESID_MASK               0xfffffffff0000000UL
#define GET_ESID(x)             (((x) >> SID_SHIFT) & SID_MASK)

/* 1T segments */
#define SID_SHIFT_1T            40
#define SID_MASK_1T             0xffffffUL
#define ESID_MASK_1T            0xffffff0000000000UL
#define GET_ESID_1T(x)          (((x) >> SID_SHIFT_1T) & SID_MASK_1T)

#ifndef __ASSEMBLER__
#include <asm/cache.h>

typedef unsigned long pte_basic_t;

static inline void clear_page(void *addr)
{
        unsigned long iterations;
        unsigned long onex, twox, fourx, eightx;

        iterations = ppc64_caches.l1d.blocks_per_page / 8;

        /*
         * Some verisions of gcc use multiply instructions to
         * calculate the offsets so lets give it a hand to
         * do better.
         */
        onex = ppc64_caches.l1d.block_size;
        twox = onex << 1;
        fourx = onex << 2;
        eightx = onex << 3;

        asm volatile(
        "mtctr  %1      # clear_page\n\
        .balign 16\n\
1:      dcbz    0,%0\n\
        dcbz    %3,%0\n\
        dcbz    %4,%0\n\
        dcbz    %5,%0\n\
        dcbz    %6,%0\n\
        dcbz    %7,%0\n\
        dcbz    %8,%0\n\
        dcbz    %9,%0\n\
        add     %0,%0,%10\n\
        bdnz+   1b"
        : "=&r" (addr)
        : "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
                "b" (twox+onex), "b" (fourx), "b" (fourx+onex),
                "b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
        : "ctr", "memory");
}

extern void copy_page(void *to, void *from);

/* Log 2 of page table size */
extern u64 ppc64_pft_size;

#endif /* __ASSEMBLER__ */

#define VM_DATA_DEFAULT_FLAGS \
        (is_32bit_task() ? \
         VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)

/*
 * This is the default if a program doesn't have a PT_GNU_STACK
 * program header entry. The PPC64 ELF ABI has a non executable stack
 * stack by default, so in the absence of a PT_GNU_STACK program header
 * we turn execute permission off.
 */
#define VM_STACK_DEFAULT_FLAGS32        VM_DATA_FLAGS_EXEC
#define VM_STACK_DEFAULT_FLAGS64        VM_DATA_FLAGS_NON_EXEC

#define VM_STACK_DEFAULT_FLAGS \
        (is_32bit_task() ? \
         VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)

#include <asm-generic/getorder.h>

#endif /* _ASM_POWERPC_PAGE_64_H */