457 lines
14 KiB
C
457 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*/
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#ifndef _ASM_MICROBLAZE_PGTABLE_H
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#define _ASM_MICROBLAZE_PGTABLE_H
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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extern int mem_init_done;
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#endif
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#include <asm-generic/pgtable-nopmd.h>
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/sched.h>
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#include <linux/threads.h>
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#include <asm/processor.h> /* For TASK_SIZE */
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#include <asm/mmu.h>
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#include <asm/page.h>
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extern unsigned long va_to_phys(unsigned long address);
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extern pte_t *va_to_pte(unsigned long address);
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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/* Start and end of the vmalloc area. */
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/* Make sure to map the vmalloc area above the pinned kernel memory area
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of 32Mb. */
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#define VMALLOC_START (CONFIG_KERNEL_START + CONFIG_LOWMEM_SIZE)
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#define VMALLOC_END ioremap_bot
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#endif /* __ASSEMBLY__ */
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/*
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* Macro to mark a page protection value as "uncacheable".
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*/
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#define _PAGE_CACHE_CTL (_PAGE_GUARDED | _PAGE_NO_CACHE | \
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_PAGE_WRITETHRU)
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#define pgprot_noncached(prot) \
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(__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
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_PAGE_NO_CACHE | _PAGE_GUARDED))
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#define pgprot_noncached_wc(prot) \
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(__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
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_PAGE_NO_CACHE))
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/*
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* The MicroBlaze MMU is identical to the PPC-40x MMU, and uses a hash
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* table containing PTEs, together with a set of 16 segment registers, to
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* define the virtual to physical address mapping.
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*
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* We use the hash table as an extended TLB, i.e. a cache of currently
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* active mappings. We maintain a two-level page table tree, much
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* like that used by the i386, for the sake of the Linux memory
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* management code. Low-level assembler code in hashtable.S
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* (procedure hash_page) is responsible for extracting ptes from the
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* tree and putting them into the hash table when necessary, and
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* updating the accessed and modified bits in the page table tree.
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*/
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/*
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* The MicroBlaze processor has a TLB architecture identical to PPC-40x. The
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* instruction and data sides share a unified, 64-entry, semi-associative
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* TLB which is maintained totally under software control. In addition, the
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* instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative
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* TLB which serves as a first level to the shared TLB. These two TLBs are
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* known as the UTLB and ITLB, respectively (see "mmu.h" for definitions).
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*/
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/*
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* The normal case is that PTEs are 32-bits and we have a 1-page
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* 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus
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*
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*/
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/* PGDIR_SHIFT determines what a top-level page table entry can map */
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#define PGDIR_SHIFT (PAGE_SHIFT + PTE_SHIFT)
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* entries per page directory level: our page-table tree is two-level, so
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* we don't really have any PMD directory.
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*/
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#define PTRS_PER_PTE (1 << PTE_SHIFT)
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT))
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#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
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#define FIRST_USER_PGD_NR 0
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#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
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#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
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#define pte_ERROR(e) \
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printk(KERN_ERR "%s:%d: bad pte "PTE_FMT".\n", \
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__FILE__, __LINE__, pte_val(e))
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#define pgd_ERROR(e) \
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printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
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__FILE__, __LINE__, pgd_val(e))
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/*
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* Bits in a linux-style PTE. These match the bits in the
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* (hardware-defined) PTE as closely as possible.
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*/
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/* There are several potential gotchas here. The hardware TLBLO
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* field looks like this:
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*
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* 0 1 2 3 4 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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* RPN..................... 0 0 EX WR ZSEL....... W I M G
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*
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* Where possible we make the Linux PTE bits match up with this
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*
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* - bits 20 and 21 must be cleared, because we use 4k pages (4xx can
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* support down to 1k pages), this is done in the TLBMiss exception
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* handler.
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* - We use only zones 0 (for kernel pages) and 1 (for user pages)
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* of the 16 available. Bit 24-26 of the TLB are cleared in the TLB
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* miss handler. Bit 27 is PAGE_USER, thus selecting the correct
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* zone.
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* - PRESENT *must* be in the bottom two bits because swap PTEs use the top
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* 30 bits. Because 4xx doesn't support SMP anyway, M is irrelevant so we
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* borrow it for PAGE_PRESENT. Bit 30 is cleared in the TLB miss handler
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* before the TLB entry is loaded.
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* - All other bits of the PTE are loaded into TLBLO without
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* * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for
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* software PTE bits. We actually use bits 21, 24, 25, and
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* 30 respectively for the software bits: ACCESSED, DIRTY, RW, and
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* PRESENT.
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*/
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/* Definitions for MicroBlaze. */
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#define _PAGE_GUARDED 0x001 /* G: page is guarded from prefetch */
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#define _PAGE_PRESENT 0x002 /* software: PTE contains a translation */
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#define _PAGE_NO_CACHE 0x004 /* I: caching is inhibited */
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#define _PAGE_WRITETHRU 0x008 /* W: caching is write-through */
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#define _PAGE_USER 0x010 /* matches one of the zone permission bits */
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#define _PAGE_RW 0x040 /* software: Writes permitted */
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#define _PAGE_DIRTY 0x080 /* software: dirty page */
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#define _PAGE_HWWRITE 0x100 /* hardware: Dirty & RW, set in exception */
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#define _PAGE_HWEXEC 0x200 /* hardware: EX permission */
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#define _PAGE_ACCESSED 0x400 /* software: R: page referenced */
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#define _PMD_PRESENT PAGE_MASK
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/* We borrow bit 24 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE _PAGE_DIRTY
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/*
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* Some bits are unused...
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*/
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#ifndef _PAGE_HASHPTE
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#define _PAGE_HASHPTE 0
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#endif
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#ifndef _PTE_NONE_MASK
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#define _PTE_NONE_MASK 0
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#endif
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#ifndef _PAGE_SHARED
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#define _PAGE_SHARED 0
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#endif
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#ifndef _PAGE_EXEC
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#define _PAGE_EXEC 0
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#endif
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
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/*
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* Note: the _PAGE_COHERENT bit automatically gets set in the hardware
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* PTE if CONFIG_SMP is defined (hash_page does this); there is no need
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* to have it in the Linux PTE, and in fact the bit could be reused for
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* another purpose. -- paulus.
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*/
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#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
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#define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE)
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#define _PAGE_KERNEL \
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(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_SHARED | _PAGE_HWEXEC)
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#define _PAGE_IO (_PAGE_KERNEL | _PAGE_NO_CACHE | _PAGE_GUARDED)
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#define PAGE_NONE __pgprot(_PAGE_BASE)
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#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
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#define PAGE_SHARED_X \
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__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
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#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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#define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_SHARED)
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#define PAGE_KERNEL_CI __pgprot(_PAGE_IO)
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/*
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* We consider execute permission the same as read.
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* Also, write permissions imply read permissions.
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*/
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#ifndef __ASSEMBLY__
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[1024];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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#endif /* __ASSEMBLY__ */
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#define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0)
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#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
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#define pte_clear(mm, addr, ptep) \
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do { set_pte_at((mm), (addr), (ptep), __pte(0)); } while (0)
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#define pmd_none(pmd) (!pmd_val(pmd))
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#define pmd_bad(pmd) ((pmd_val(pmd) & _PMD_PRESENT) == 0)
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#define pmd_present(pmd) ((pmd_val(pmd) & _PMD_PRESENT) != 0)
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#define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0)
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#define pte_page(x) (mem_map + (unsigned long) \
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((pte_val(x) - memory_start) >> PAGE_SHIFT))
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#define PFN_PTE_SHIFT PAGE_SHIFT
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#define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT)
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#define pfn_pte(pfn, prot) \
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__pte(((pte_basic_t)(pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
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#ifndef __ASSEMBLY__
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
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static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
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static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; }
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
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static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
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static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
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static inline pte_t pte_rdprotect(pte_t pte) \
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{ pte_val(pte) &= ~_PAGE_USER; return pte; }
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static inline pte_t pte_wrprotect(pte_t pte) \
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{ pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
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static inline pte_t pte_exprotect(pte_t pte) \
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{ pte_val(pte) &= ~_PAGE_EXEC; return pte; }
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static inline pte_t pte_mkclean(pte_t pte) \
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{ pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
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static inline pte_t pte_mkold(pte_t pte) \
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{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkread(pte_t pte) \
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{ pte_val(pte) |= _PAGE_USER; return pte; }
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static inline pte_t pte_mkexec(pte_t pte) \
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{ pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
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static inline pte_t pte_mkwrite_novma(pte_t pte) \
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{ pte_val(pte) |= _PAGE_RW; return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) \
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{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) \
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{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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static inline pte_t mk_pte_phys(phys_addr_t physpage, pgprot_t pgprot)
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{
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pte_t pte;
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pte_val(pte) = physpage | pgprot_val(pgprot);
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return pte;
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}
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#define mk_pte(page, pgprot) \
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({ \
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pte_t pte; \
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pte_val(pte) = (((page - mem_map) << PAGE_SHIFT) + memory_start) | \
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pgprot_val(pgprot); \
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pte; \
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})
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
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return pte;
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}
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/*
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* Atomic PTE updates.
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*
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* pte_update clears and sets bit atomically, and returns
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* the old pte value.
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* The ((unsigned long)(p+1) - 4) hack is to get to the least-significant
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* 32 bits of the PTE regardless of whether PTEs are 32 or 64 bits.
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*/
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static inline unsigned long pte_update(pte_t *p, unsigned long clr,
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unsigned long set)
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{
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unsigned long flags, old, tmp;
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raw_local_irq_save(flags);
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__asm__ __volatile__( "lw %0, %2, r0 \n"
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"andn %1, %0, %3 \n"
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"or %1, %1, %4 \n"
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"sw %1, %2, r0 \n"
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: "=&r" (old), "=&r" (tmp)
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: "r" ((unsigned long)(p + 1) - 4), "r" (clr), "r" (set)
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: "cc");
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raw_local_irq_restore(flags);
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return old;
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}
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/*
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* set_pte stores a linux PTE into the linux page table.
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*/
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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;
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}
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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struct vm_area_struct;
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static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0;
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}
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static inline int ptep_test_and_clear_dirty(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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return (pte_update(ptep, \
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(_PAGE_DIRTY | _PAGE_HWWRITE), 0) & _PAGE_DIRTY) != 0;
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}
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0));
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}
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/*static inline void ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0);
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}*/
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static inline void ptep_mkdirty(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_update(ptep, 0, _PAGE_DIRTY);
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}
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/*#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)*/
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/* Convert pmd entry to page */
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/* our pmd entry is an effective address of pte table*/
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/* returns effective address of the pmd entry*/
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static inline unsigned long pmd_page_vaddr(pmd_t pmd)
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{
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return ((unsigned long) (pmd_val(pmd) & PAGE_MASK));
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}
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/* returns pfn of the pmd entry*/
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#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
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/* returns struct *page of the pmd entry*/
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#define pmd_page(pmd) (pfn_to_page(__pa(pmd_val(pmd)) >> PAGE_SHIFT))
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/* Find an entry in the third-level page table.. */
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* <------------------ offset -------------------> E < type -> 0 0
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*
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* E is the exclusive marker that is not stored in swap entries.
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*/
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#define __swp_type(entry) ((entry).val & 0x1f)
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#define __swp_offset(entry) ((entry).val >> 6)
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#define __swp_entry(type, offset) \
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((swp_entry_t) { ((type) & 0x1f) | ((offset) << 6) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 2 })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 2 })
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static inline int pte_swp_exclusive(pte_t pte)
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{
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return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
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}
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static inline pte_t pte_swp_mkexclusive(pte_t pte)
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{
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pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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extern unsigned long iopa(unsigned long addr);
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/* Values for nocacheflag and cmode */
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/* These are not used by the APUS kernel_map, but prevents
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* compilation errors.
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*/
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#define IOMAP_FULL_CACHING 0
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#define IOMAP_NOCACHE_SER 1
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#define IOMAP_NOCACHE_NONSER 2
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#define IOMAP_NO_COPYBACK 3
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void do_page_fault(struct pt_regs *regs, unsigned long address,
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unsigned long error_code);
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void mapin_ram(void);
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int map_page(unsigned long va, phys_addr_t pa, int flags);
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extern int mem_init_done;
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asmlinkage void __init mmu_init(void);
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#ifndef __ASSEMBLY__
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extern unsigned long ioremap_bot, ioremap_base;
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void setup_memory(void);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_PGTABLE_H */
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