478 lines
16 KiB
C
478 lines
16 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_PGTABLE_32_H
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#define __ASM_SH_PGTABLE_32_H
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/*
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* Linux PTEL encoding.
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*
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* Hardware and software bit definitions for the PTEL value (see below for
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* notes on SH-X2 MMUs and 64-bit PTEs):
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*
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* - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4).
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*
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* - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the
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* hardware PTEL value can't have the SH-bit set when MMUCR.IX is set,
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* which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT).
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*
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* In order to keep this relatively clean, do not use these for defining
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* SH-3 specific flags until all of the other unused bits have been
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* exhausted.
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*
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* - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE.
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*
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* - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages.
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* Bit 10 is used for _PAGE_ACCESSED, and bit 11 is used for _PAGE_SPECIAL.
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*
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* - On 29 bit platforms, bits 31 to 29 are used for the space attributes
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* and timing control which (together with bit 0) are moved into the
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* old-style PTEA on the parts that support it.
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*
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* SH-X2 MMUs and extended PTEs
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*
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* SH-X2 supports an extended mode TLB with split data arrays due to the
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* number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and
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* SZ bit placeholders still exist in data array 1, but are implemented as
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* reserved bits, with the real logic existing in data array 2.
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*
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* The downside to this is that we can no longer fit everything in to a 32-bit
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* PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus
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* side, this gives us quite a few spare bits to play with for future usage.
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*/
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/* Legacy and compat mode bits */
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#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
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#define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */
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#define _PAGE_DIRTY 0x004 /* D-bit : page changed */
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#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
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#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
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#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
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#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/
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#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
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#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
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#define _PAGE_PROTNONE 0x200 /* software: if not present */
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#define _PAGE_ACCESSED 0x400 /* software: page referenced */
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#define _PAGE_SPECIAL 0x800 /* software: special page */
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#define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1)
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#define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER)
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/* Extended mode bits */
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#define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */
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#define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */
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#define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */
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#define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */
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#define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */
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#define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */
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#define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */
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#define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */
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#define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */
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#define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */
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#define _PAGE_EXT_WIRED 0x4000 /* software: Wire TLB entry */
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/* Wrapper for extended mode pgprot twiddling */
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#define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
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#ifdef CONFIG_X2TLB
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#define _PAGE_PCC_MASK 0x00000000 /* No legacy PTEA support */
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#else
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/* software: moves to PTEA.TC (Timing Control) */
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#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
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#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
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/* software: moves to PTEA.SA[2:0] (Space Attributes) */
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#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
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#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
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#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
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#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
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#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
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#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
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#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
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#define _PAGE_PCC_MASK 0xe0000001
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/* copy the ptea attributes */
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static inline unsigned long copy_ptea_attributes(unsigned long x)
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{
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return ((x >> 28) & 0xe) | (x & 0x1);
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}
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#endif
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/* Mask which drops unused bits from the PTEL value */
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#if defined(CONFIG_CPU_SH3)
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#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \
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_PAGE_SZ1 | _PAGE_HW_SHARED)
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#elif defined(CONFIG_X2TLB)
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/* Get rid of the legacy PR/SZ bits when using extended mode */
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#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \
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_PAGE_PR_MASK | _PAGE_SZ_MASK)
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#else
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#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED)
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#endif
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#define _PAGE_FLAGS_HARDWARE_MASK (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS))
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/* Hardware flags, page size encoding */
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#if !defined(CONFIG_MMU)
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# define _PAGE_FLAGS_HARD 0ULL
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#elif defined(CONFIG_X2TLB)
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# if defined(CONFIG_PAGE_SIZE_4KB)
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# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0)
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# elif defined(CONFIG_PAGE_SIZE_8KB)
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# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1)
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# elif defined(CONFIG_PAGE_SIZE_64KB)
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# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2)
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# endif
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#else
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# if defined(CONFIG_PAGE_SIZE_4KB)
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# define _PAGE_FLAGS_HARD _PAGE_SZ0
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# elif defined(CONFIG_PAGE_SIZE_64KB)
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# define _PAGE_FLAGS_HARD _PAGE_SZ1
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# endif
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#endif
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#if defined(CONFIG_X2TLB)
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# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2)
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# elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
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# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
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# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
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# elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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# define _PAGE_SZHUGE (_PAGE_EXT_ESZ3)
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# elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
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# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
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# endif
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# define _PAGE_WIRED (_PAGE_EXT(_PAGE_EXT_WIRED))
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#else
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# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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# define _PAGE_SZHUGE (_PAGE_SZ1)
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# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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# define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
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# endif
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# define _PAGE_WIRED (0)
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#endif
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/*
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* Stub out _PAGE_SZHUGE if we don't have a good definition for it,
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* to make pte_mkhuge() happy.
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*/
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#ifndef _PAGE_SZHUGE
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# define _PAGE_SZHUGE (_PAGE_FLAGS_HARD)
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#endif
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/*
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* Mask of bits that are to be preserved across pgprot changes.
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*/
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#define _PAGE_CHG_MASK \
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(PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \
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_PAGE_DIRTY | _PAGE_SPECIAL)
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_X2TLB) /* SH-X2 TLB */
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
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_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
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_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_KERN_WRITE | \
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_PAGE_EXT_USER_READ | \
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_PAGE_EXT_USER_WRITE))
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#define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
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_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
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_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_USER_EXEC | \
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_PAGE_EXT_USER_READ))
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#define PAGE_COPY PAGE_EXECREAD
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
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_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_USER_READ))
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#define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
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_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
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_PAGE_EXT_USER_WRITE))
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#define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
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_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
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_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_KERN_EXEC | \
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_PAGE_EXT_USER_WRITE | \
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_PAGE_EXT_USER_READ | \
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_PAGE_EXT_USER_EXEC))
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
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_PAGE_DIRTY | _PAGE_ACCESSED | \
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_PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_KERN_WRITE | \
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_PAGE_EXT_KERN_EXEC))
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#define PAGE_KERNEL_NOCACHE \
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__pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_HW_SHARED | \
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_PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_KERN_WRITE | \
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_PAGE_EXT_KERN_EXEC))
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#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
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_PAGE_DIRTY | _PAGE_ACCESSED | \
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_PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
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_PAGE_EXT(_PAGE_EXT_KERN_READ | \
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_PAGE_EXT_KERN_EXEC))
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#define PAGE_KERNEL_PCC(slot, type) \
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__pgprot(0)
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#elif defined(CONFIG_MMU) /* SH-X TLB */
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
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_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
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_PAGE_CACHABLE | _PAGE_ACCESSED | \
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_PAGE_FLAGS_HARD)
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
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_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
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_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_EXECREAD PAGE_READONLY
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#define PAGE_RWX PAGE_SHARED
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#define PAGE_WRITEONLY PAGE_SHARED
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
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_PAGE_DIRTY | _PAGE_ACCESSED | \
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_PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_NOCACHE \
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__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_HW_SHARED | \
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_PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
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_PAGE_DIRTY | _PAGE_ACCESSED | \
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_PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_PCC(slot, type) \
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__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
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(slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
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(type))
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#else /* no mmu */
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#define PAGE_NONE __pgprot(0)
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#define PAGE_SHARED __pgprot(0)
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#define PAGE_COPY __pgprot(0)
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#define PAGE_EXECREAD __pgprot(0)
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#define PAGE_RWX __pgprot(0)
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#define PAGE_READONLY __pgprot(0)
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#define PAGE_WRITEONLY __pgprot(0)
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#define PAGE_KERNEL __pgprot(0)
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#define PAGE_KERNEL_NOCACHE __pgprot(0)
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#define PAGE_KERNEL_RO __pgprot(0)
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#define PAGE_KERNEL_PCC(slot, type) \
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__pgprot(0)
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#endif
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#endif /* __ASSEMBLY__ */
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#ifndef __ASSEMBLY__
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/*
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* Certain architectures need to do special things when PTEs
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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#ifdef CONFIG_X2TLB
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static inline void set_pte(pte_t *ptep, pte_t pte)
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{
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ptep->pte_high = pte.pte_high;
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smp_wmb();
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ptep->pte_low = pte.pte_low;
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}
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#else
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#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
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#endif
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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/*
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* (pmds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
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#define pfn_pte(pfn, prot) \
|
||
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|
__pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
||
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|
#define pfn_pmd(pfn, prot) \
|
||
|
|
__pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
||
|
|
|
||
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|
#define pte_none(x) (!pte_val(x))
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||
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#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
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||
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|
#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
|
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||
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#define pmd_none(x) (!pmd_val(x))
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#define pmd_present(x) (pmd_val(x))
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#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
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#define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK)
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||
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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||
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/*
|
||
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* The following only work if pte_present() is true.
|
||
|
|
* Undefined behaviour if not..
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||
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|
*/
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||
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#define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT))
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#define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY)
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#define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED)
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#define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL)
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||
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|
|
||
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|
#ifdef CONFIG_X2TLB
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||
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|
#define pte_write(pte) \
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||
|
|
((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE))
|
||
|
|
#else
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||
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|
#define pte_write(pte) ((pte).pte_low & _PAGE_RW)
|
||
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|
#endif
|
||
|
|
|
||
|
|
#define PTE_BIT_FUNC(h,fn,op) \
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||
|
|
static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
|
||
|
|
|
||
|
|
#ifdef CONFIG_X2TLB
|
||
|
|
/*
|
||
|
|
* We cheat a bit in the SH-X2 TLB case. As the permission bits are
|
||
|
|
* individually toggled (and user permissions are entirely decoupled from
|
||
|
|
* kernel permissions), we attempt to couple them a bit more sanely here.
|
||
|
|
*/
|
||
|
|
PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE));
|
||
|
|
PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
|
||
|
|
PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
|
||
|
|
#else
|
||
|
|
PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
|
||
|
|
PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
|
||
|
|
PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
|
||
|
|
PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
|
||
|
|
PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
|
||
|
|
PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
|
||
|
|
PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Macro and implementation to make a page protection as uncachable.
|
||
|
|
*/
|
||
|
|
#define pgprot_writecombine(prot) \
|
||
|
|
__pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
|
||
|
|
|
||
|
|
#define pgprot_noncached pgprot_writecombine
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Conversion functions: convert a page and protection to a page entry,
|
||
|
|
* and a page entry and page directory to the page they refer to.
|
||
|
|
*
|
||
|
|
* extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
|
||
|
|
*/
|
||
|
|
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
|
||
|
|
|
||
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
||
|
|
{
|
||
|
|
pte.pte_low &= _PAGE_CHG_MASK;
|
||
|
|
pte.pte_low |= pgprot_val(newprot);
|
||
|
|
|
||
|
|
#ifdef CONFIG_X2TLB
|
||
|
|
pte.pte_high |= pgprot_val(newprot) >> 32;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return pte;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd))
|
||
|
|
#define pmd_page(pmd) (virt_to_page(pmd_val(pmd)))
|
||
|
|
|
||
|
|
/* to find an entry in a page-table-directory. */
|
||
|
|
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
|
||
|
|
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
|
||
|
|
#define __pgd_offset(address) pgd_index(address)
|
||
|
|
|
||
|
|
/* to find an entry in a kernel page-table-directory */
|
||
|
|
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
|
||
|
|
|
||
|
|
#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
|
||
|
|
#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
|
||
|
|
|
||
|
|
/* Find an entry in the third-level page table.. */
|
||
|
|
#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
|
||
|
|
#define __pte_offset(address) pte_index(address)
|
||
|
|
|
||
|
|
#define pte_offset_kernel(dir, address) \
|
||
|
|
((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
|
||
|
|
#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
|
||
|
|
#define pte_unmap(pte) do { } while (0)
|
||
|
|
|
||
|
|
#ifdef CONFIG_X2TLB
|
||
|
|
#define pte_ERROR(e) \
|
||
|
|
printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
|
||
|
|
&(e), (e).pte_high, (e).pte_low)
|
||
|
|
#define pgd_ERROR(e) \
|
||
|
|
printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
|
||
|
|
#else
|
||
|
|
#define pte_ERROR(e) \
|
||
|
|
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
|
||
|
|
#define pgd_ERROR(e) \
|
||
|
|
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Encode and de-code a swap entry
|
||
|
|
*
|
||
|
|
* Constraints:
|
||
|
|
* _PAGE_PRESENT at bit 8
|
||
|
|
* _PAGE_PROTNONE at bit 9
|
||
|
|
*
|
||
|
|
* For the normal case, we encode the swap type into bits 0:7 and the
|
||
|
|
* swap offset into bits 10:30. For the 64-bit PTE case, we keep the
|
||
|
|
* preserved bits in the low 32-bits and use the upper 32 as the swap
|
||
|
|
* offset (along with a 5-bit type), following the same approach as x86
|
||
|
|
* PAE. This keeps the logic quite simple.
|
||
|
|
*
|
||
|
|
* As is evident by the Alpha code, if we ever get a 64-bit unsigned
|
||
|
|
* long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
|
||
|
|
* much cleaner..
|
||
|
|
*
|
||
|
|
* NOTE: We should set ZEROs at the position of _PAGE_PRESENT
|
||
|
|
* and _PAGE_PROTNONE bits
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_X2TLB
|
||
|
|
#define __swp_type(x) ((x).val & 0x1f)
|
||
|
|
#define __swp_offset(x) ((x).val >> 5)
|
||
|
|
#define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5})
|
||
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
|
||
|
|
#define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
|
||
|
|
|
||
|
|
#else
|
||
|
|
#define __swp_type(x) ((x).val & 0xff)
|
||
|
|
#define __swp_offset(x) ((x).val >> 10)
|
||
|
|
#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10})
|
||
|
|
|
||
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
|
||
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLY__ */
|
||
|
|
#endif /* __ASM_SH_PGTABLE_32_H */
|