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/* 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 __ASSEMBLY__
#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 /* __ASSEMBLY__ */
#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 */
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