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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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