372 lines
11 KiB
C
372 lines
11 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H
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#define _ASM_POWERPC_NOHASH_32_PGTABLE_H
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#include <asm-generic/pgtable-nopmd.h>
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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/mmu.h> /* For sub-arch specific PPC_PIN_SIZE */
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#ifdef CONFIG_44x
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extern int icache_44x_need_flush;
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#endif
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#endif /* __ASSEMBLY__ */
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#define PTE_INDEX_SIZE PTE_SHIFT
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#define PMD_INDEX_SIZE 0
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#define PUD_INDEX_SIZE 0
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#define PGD_INDEX_SIZE (32 - PGDIR_SHIFT)
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#define PMD_CACHE_INDEX PMD_INDEX_SIZE
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#define PUD_CACHE_INDEX PUD_INDEX_SIZE
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#ifndef __ASSEMBLY__
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#define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
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#define PMD_TABLE_SIZE 0
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#define PUD_TABLE_SIZE 0
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#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
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#define PMD_MASKED_BITS (PTE_TABLE_SIZE - 1)
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#endif /* __ASSEMBLY__ */
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#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
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#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
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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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* For any >32-bit physical address platform, we can use the following
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* two level page table layout where the pgdir is 8KB and the MS 13 bits
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* are an index to the second level table. The combined pgdir/pmd first
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* level has 2048 entries and the second level has 512 64-bit PTE entries.
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* -Matt
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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_INDEX_SIZE)
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/* Bits to mask out from a PGD to get to the PUD page */
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#define PGD_MASKED_BITS 0
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#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
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#define pte_ERROR(e) \
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pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \
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(unsigned long long)pte_val(e))
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#define pgd_ERROR(e) \
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pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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#ifndef __ASSEMBLY__
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int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
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void unmap_kernel_page(unsigned long va);
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#endif /* !__ASSEMBLY__ */
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/*
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* This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
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* value (for now) on others, from where we can start layout kernel
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* virtual space that goes below PKMAP and FIXMAP
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*/
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#include <asm/fixmap.h>
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/*
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* ioremap_bot starts at that address. Early ioremaps move down from there,
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* until mem_init() at which point this becomes the top of the vmalloc
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* and ioremap space
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*/
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#ifdef CONFIG_HIGHMEM
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#define IOREMAP_TOP PKMAP_BASE
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#else
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#define IOREMAP_TOP FIXADDR_START
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#endif
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/* PPC32 shares vmalloc area with ioremap */
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#define IOREMAP_START VMALLOC_START
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#define IOREMAP_END VMALLOC_END
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/*
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* Just any arbitrary offset to the start of the vmalloc VM area: the
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* current 16MB value just means that there will be a 64MB "hole" after the
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* physical memory until the kernel virtual memory starts. That means that
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* any out-of-bounds memory accesses will hopefully be caught.
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* The vmalloc() routines leaves a hole of 4kB between each vmalloced
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* area for the same reason. ;)
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*
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* We no longer map larger than phys RAM with the BATs so we don't have
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* to worry about the VMALLOC_OFFSET causing problems. We do have to worry
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* about clashes between our early calls to ioremap() that start growing down
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* from IOREMAP_TOP being run into the VM area allocations (growing upwards
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* from VMALLOC_START). For this reason we have ioremap_bot to check when
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* we actually run into our mappings setup in the early boot with the VM
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* system. This really does become a problem for machines with good amounts
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* of RAM. -- Cort
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*/
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#define VMALLOC_OFFSET (0x1000000) /* 16M */
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#ifdef PPC_PIN_SIZE
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#define VMALLOC_START (((ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
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#else
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#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
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#endif
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#ifdef CONFIG_KASAN_VMALLOC
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#define VMALLOC_END ALIGN_DOWN(ioremap_bot, PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
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#else
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#define VMALLOC_END ioremap_bot
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#endif
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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) PowerPC PTE as closely as possible.
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*/
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#if defined(CONFIG_40x)
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#include <asm/nohash/32/pte-40x.h>
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#elif defined(CONFIG_44x)
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#include <asm/nohash/32/pte-44x.h>
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#elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT)
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#include <asm/nohash/pte-book3e.h>
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#elif defined(CONFIG_FSL_BOOKE)
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#include <asm/nohash/32/pte-fsl-booke.h>
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#elif defined(CONFIG_PPC_8xx)
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#include <asm/nohash/32/pte-8xx.h>
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#endif
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/*
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* Location of the PFN in the PTE. Most 32-bit platforms use the same
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* as _PAGE_SHIFT here (ie, naturally aligned).
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* Platform who don't just pre-define the value so we don't override it here.
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*/
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#ifndef PTE_RPN_SHIFT
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#define PTE_RPN_SHIFT (PAGE_SHIFT)
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#endif
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/*
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* The mask covered by the RPN must be a ULL on 32-bit platforms with
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* 64-bit PTEs.
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*/
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#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
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#define PTE_RPN_MASK (~((1ULL << PTE_RPN_SHIFT) - 1))
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#define MAX_POSSIBLE_PHYSMEM_BITS 36
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#else
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#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
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#define MAX_POSSIBLE_PHYSMEM_BITS 32
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#endif
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/*
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* _PAGE_CHG_MASK masks of bits that are to be preserved across
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* pgprot changes.
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*/
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
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#ifndef __ASSEMBLY__
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#define pte_clear(mm, addr, ptep) \
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do { pte_update(mm, addr, ptep, ~0, 0, 0); } while (0)
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#ifndef pte_mkwrite
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_RW);
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}
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#endif
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_DIRTY);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_ACCESSED);
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}
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#ifndef pte_wrprotect
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_RW);
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}
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#endif
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#ifndef pte_mkexec
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static inline pte_t pte_mkexec(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_EXEC);
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}
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#endif
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#define pmd_none(pmd) (!pmd_val(pmd))
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#define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
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#define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
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static inline void pmd_clear(pmd_t *pmdp)
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{
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*pmdp = __pmd(0);
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}
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/*
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* PTE updates. This function is called whenever an existing
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* valid PTE is updated. This does -not- include set_pte_at()
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* which nowadays only sets a new PTE.
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*
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* Depending on the type of MMU, we may need to use atomic updates
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* and the PTE may be either 32 or 64 bit wide. In the later case,
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* when using atomic updates, only the low part of the PTE is
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* accessed atomically.
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*
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* In addition, on 44x, we also maintain a global flag indicating
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* that an executable user mapping was modified, which is needed
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* to properly flush the virtually tagged instruction cache of
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* those implementations.
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*
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* On the 8xx, the page tables are a bit special. For 16k pages, we have
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* 4 identical entries. For 512k pages, we have 128 entries as if it was
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* 4k pages, but they are flagged as 512k pages for the hardware.
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* For other page sizes, we have a single entry in the table.
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*/
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#ifdef CONFIG_PPC_8xx
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static pmd_t *pmd_off(struct mm_struct *mm, unsigned long addr);
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static int hugepd_ok(hugepd_t hpd);
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static int number_of_cells_per_pte(pmd_t *pmd, pte_basic_t val, int huge)
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{
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if (!huge)
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return PAGE_SIZE / SZ_4K;
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else if (hugepd_ok(*((hugepd_t *)pmd)))
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return 1;
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else if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !(val & _PAGE_HUGE))
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return SZ_16K / SZ_4K;
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else
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return SZ_512K / SZ_4K;
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}
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static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
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unsigned long clr, unsigned long set, int huge)
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{
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pte_basic_t *entry = (pte_basic_t *)p;
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pte_basic_t old = pte_val(*p);
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pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
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int num, i;
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pmd_t *pmd = pmd_off(mm, addr);
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num = number_of_cells_per_pte(pmd, new, huge);
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for (i = 0; i < num; i++, entry++, new += SZ_4K)
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*entry = new;
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return old;
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}
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#ifdef CONFIG_PPC_16K_PAGES
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#define __HAVE_ARCH_PTEP_GET
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static inline pte_t ptep_get(pte_t *ptep)
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{
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pte_basic_t val = READ_ONCE(ptep->pte);
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pte_t pte = {val, val, val, val};
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return pte;
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}
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#endif /* CONFIG_PPC_16K_PAGES */
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#else
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static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
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unsigned long clr, unsigned long set, int huge)
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{
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pte_basic_t old = pte_val(*p);
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pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
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*p = __pte(new);
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#ifdef CONFIG_44x
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if ((old & _PAGE_USER) && (old & _PAGE_EXEC))
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icache_44x_need_flush = 1;
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#endif
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return old;
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}
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#endif
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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unsigned long old;
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old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
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return (old & _PAGE_ACCESSED) != 0;
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}
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#define ptep_test_and_clear_young(__vma, __addr, __ptep) \
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__ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep)
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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, unsigned long addr,
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pte_t *ptep)
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{
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return __pte(pte_update(mm, addr, ptep, ~0, 0, 0));
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}
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#define __HAVE_ARCH_PTEP_SET_WRPROTECT
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#ifndef ptep_set_wrprotect
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
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}
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#endif
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#ifndef __ptep_set_access_flags
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static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
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pte_t *ptep, pte_t entry,
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unsigned long address,
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int psize)
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{
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unsigned long set = pte_val(entry) &
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(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
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int huge = psize > mmu_virtual_psize ? 1 : 0;
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pte_update(vma->vm_mm, address, ptep, 0, set, huge);
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flush_tlb_page(vma, address);
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}
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#endif
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static inline int pte_young(pte_t pte)
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{
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return pte_val(pte) & _PAGE_ACCESSED;
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}
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/*
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* Note that on Book E processors, the pmd contains the kernel virtual
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* (lowmem) address of the pte page. The physical address is less useful
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* because everything runs with translation enabled (even the TLB miss
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* handler). On everything else the pmd contains the physical address
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||
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* of the pte page. -- paulus
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||
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*/
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||
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#ifndef CONFIG_BOOKE
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||
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#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
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||
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#else
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||
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#define pmd_page_vaddr(pmd) \
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||
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|
((unsigned long)(pmd_val(pmd) & ~(PTE_TABLE_SIZE - 1)))
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||
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#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
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||
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|
#endif
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||
|
|
|
||
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|
#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
|
||
|
|
/*
|
||
|
|
* Encode and decode a swap entry.
|
||
|
|
* Note that the bits we use in a PTE for representing a swap entry
|
||
|
|
* must not include the _PAGE_PRESENT bit.
|
||
|
|
* -- paulus
|
||
|
|
*/
|
||
|
|
#define __swp_type(entry) ((entry).val & 0x1f)
|
||
|
|
#define __swp_offset(entry) ((entry).val >> 5)
|
||
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) })
|
||
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
|
||
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
|
||
|
|
#endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */
|