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Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/include/asm/page_64.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/page_64.h b/arch/powerpc/include/asm/page_64.h new file mode 100644 index 000000000..79a9b7c6a --- /dev/null +++ b/arch/powerpc/include/asm/page_64.h @@ -0,0 +1,106 @@ +/* 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 */ |