| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Michal Simek | 1349 | 97.97% | 9 | 69.23% |
| Mike Rapoport | 26 | 1.89% | 2 | 15.38% |
| Geert Uytterhoeven | 1 | 0.07% | 1 | 7.69% |
| Kirill A. Shutemov | 1 | 0.07% | 1 | 7.69% |
| Total | 1377 | 13 |
/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. */ #ifndef _ASM_MICROBLAZE_PGTABLE_H #define _ASM_MICROBLAZE_PGTABLE_H #include <asm/setup.h> #ifndef __ASSEMBLY__ extern int mem_init_done; #endif #include <asm-generic/pgtable-nopmd.h> #ifdef __KERNEL__ #ifndef __ASSEMBLY__ #include <linux/sched.h> #include <linux/threads.h> #include <asm/processor.h> /* For TASK_SIZE */ #include <asm/mmu.h> #include <asm/page.h> #define FIRST_USER_ADDRESS 0UL extern unsigned long va_to_phys(unsigned long address); extern pte_t *va_to_pte(unsigned long address); /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ /* Start and end of the vmalloc area. */ /* Make sure to map the vmalloc area above the pinned kernel memory area of 32Mb. */ #define VMALLOC_START (CONFIG_KERNEL_START + CONFIG_LOWMEM_SIZE) #define VMALLOC_END ioremap_bot #endif /* __ASSEMBLY__ */ /* * Macro to mark a page protection value as "uncacheable". */ #define _PAGE_CACHE_CTL (_PAGE_GUARDED | _PAGE_NO_CACHE | \ _PAGE_WRITETHRU) #define pgprot_noncached(prot) \ (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ _PAGE_NO_CACHE | _PAGE_GUARDED)) #define pgprot_noncached_wc(prot) \ (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ _PAGE_NO_CACHE)) /* * The MicroBlaze MMU is identical to the PPC-40x MMU, and uses a hash * table containing PTEs, together with a set of 16 segment registers, to * define the virtual to physical address mapping. * * We use the hash table as an extended TLB, i.e. a cache of currently * active mappings. We maintain a two-level page table tree, much * like that used by the i386, for the sake of the Linux memory * management code. Low-level assembler code in hashtable.S * (procedure hash_page) is responsible for extracting ptes from the * tree and putting them into the hash table when necessary, and * updating the accessed and modified bits in the page table tree. */ /* * The MicroBlaze processor has a TLB architecture identical to PPC-40x. The * instruction and data sides share a unified, 64-entry, semi-associative * TLB which is maintained totally under software control. In addition, the * instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative * TLB which serves as a first level to the shared TLB. These two TLBs are * known as the UTLB and ITLB, respectively (see "mmu.h" for definitions). */ /* * The normal case is that PTEs are 32-bits and we have a 1-page * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus * */ /* PGDIR_SHIFT determines what a top-level page table entry can map */ #define PGDIR_SHIFT (PAGE_SHIFT + PTE_SHIFT) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * entries per page directory level: our page-table tree is two-level, so * we don't really have any PMD directory. */ #define PTRS_PER_PTE (1 << PTE_SHIFT) #define PTRS_PER_PMD 1 #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) #define FIRST_USER_PGD_NR 0 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT) #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) #define pte_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pte "PTE_FMT".\n", \ __FILE__, __LINE__, pte_val(e)) #define pgd_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \ __FILE__, __LINE__, pgd_val(e)) /* * Bits in a linux-style PTE. These match the bits in the * (hardware-defined) PTE as closely as possible. */ /* There are several potential gotchas here. The hardware TLBLO * field looks like this: * * 0 1 2 3 4 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 * RPN..................... 0 0 EX WR ZSEL....... W I M G * * Where possible we make the Linux PTE bits match up with this * * - bits 20 and 21 must be cleared, because we use 4k pages (4xx can * support down to 1k pages), this is done in the TLBMiss exception * handler. * - We use only zones 0 (for kernel pages) and 1 (for user pages) * of the 16 available. Bit 24-26 of the TLB are cleared in the TLB * miss handler. Bit 27 is PAGE_USER, thus selecting the correct * zone. * - PRESENT *must* be in the bottom two bits because swap cache * entries use the top 30 bits. Because 4xx doesn't support SMP * anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30 * is cleared in the TLB miss handler before the TLB entry is loaded. * - All other bits of the PTE are loaded into TLBLO without * * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for * software PTE bits. We actually use bits 21, 24, 25, and * 30 respectively for the software bits: ACCESSED, DIRTY, RW, and * PRESENT. */ /* Definitions for MicroBlaze. */ #define _PAGE_GUARDED 0x001 /* G: page is guarded from prefetch */ #define _PAGE_PRESENT 0x002 /* software: PTE contains a translation */ #define _PAGE_NO_CACHE 0x004 /* I: caching is inhibited */ #define _PAGE_WRITETHRU 0x008 /* W: caching is write-through */ #define _PAGE_USER 0x010 /* matches one of the zone permission bits */ #define _PAGE_RW 0x040 /* software: Writes permitted */ #define _PAGE_DIRTY 0x080 /* software: dirty page */ #define _PAGE_HWWRITE 0x100 /* hardware: Dirty & RW, set in exception */ #define _PAGE_HWEXEC 0x200 /* hardware: EX permission */ #define _PAGE_ACCESSED 0x400 /* software: R: page referenced */ #define _PMD_PRESENT PAGE_MASK /* * Some bits are unused... */ #ifndef _PAGE_HASHPTE #define _PAGE_HASHPTE 0 #endif #ifndef _PTE_NONE_MASK #define _PTE_NONE_MASK 0 #endif #ifndef _PAGE_SHARED #define _PAGE_SHARED 0 #endif #ifndef _PAGE_EXEC #define _PAGE_EXEC 0 #endif #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) /* * Note: the _PAGE_COHERENT bit automatically gets set in the hardware * PTE if CONFIG_SMP is defined (hash_page does this); there is no need * to have it in the Linux PTE, and in fact the bit could be reused for * another purpose. -- paulus. */ #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED) #define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE) #define _PAGE_KERNEL \ (_PAGE_BASE | _PAGE_WRENABLE | _PAGE_SHARED | _PAGE_HWEXEC) #define _PAGE_IO (_PAGE_KERNEL | _PAGE_NO_CACHE | _PAGE_GUARDED) #define PAGE_NONE __pgprot(_PAGE_BASE) #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER) #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) #define PAGE_SHARED_X \ __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC) #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER) #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_SHARED) #define PAGE_KERNEL_CI __pgprot(_PAGE_IO) /* * We consider execute permission the same as read. * Also, write permissions imply read permissions. */ #define __P000 PAGE_NONE #define __P001 PAGE_READONLY_X #define __P010 PAGE_COPY #define __P011 PAGE_COPY_X #define __P100 PAGE_READONLY #define __P101 PAGE_READONLY_X #define __P110 PAGE_COPY #define __P111 PAGE_COPY_X #define __S000 PAGE_NONE #define __S001 PAGE_READONLY_X #define __S010 PAGE_SHARED #define __S011 PAGE_SHARED_X #define __S100 PAGE_READONLY #define __S101 PAGE_READONLY_X #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED_X #ifndef __ASSEMBLY__ /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[1024]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) #endif /* __ASSEMBLY__ */ #define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0) #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) #define pte_clear(mm, addr, ptep) \ do { set_pte_at((mm), (addr), (ptep), __pte(0)); } while (0) #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_bad(pmd) ((pmd_val(pmd) & _PMD_PRESENT) == 0) #define pmd_present(pmd) ((pmd_val(pmd) & _PMD_PRESENT) != 0) #define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0) #define pte_page(x) (mem_map + (unsigned long) \ ((pte_val(x) - memory_start) >> PAGE_SHIFT)) #define PFN_SHIFT_OFFSET (PAGE_SHIFT) #define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET) #define pfn_pte(pfn, prot) \ __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) | pgprot_val(prot)) #ifndef __ASSEMBLY__ /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; } static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; } static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; } static inline pte_t pte_rdprotect(pte_t pte) \ { pte_val(pte) &= ~_PAGE_USER; return pte; } static inline pte_t pte_wrprotect(pte_t pte) \ { pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; } static inline pte_t pte_exprotect(pte_t pte) \ { pte_val(pte) &= ~_PAGE_EXEC; return pte; } static inline pte_t pte_mkclean(pte_t pte) \ { pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; } static inline pte_t pte_mkold(pte_t pte) \ { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } static inline pte_t pte_mkread(pte_t pte) \ { pte_val(pte) |= _PAGE_USER; return pte; } static inline pte_t pte_mkexec(pte_t pte) \ { pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; } static inline pte_t pte_mkwrite(pte_t pte) \ { pte_val(pte) |= _PAGE_RW; return pte; } static inline pte_t pte_mkdirty(pte_t pte) \ { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) \ { pte_val(pte) |= _PAGE_ACCESSED; return pte; } /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ static inline pte_t mk_pte_phys(phys_addr_t physpage, pgprot_t pgprot) { pte_t pte; pte_val(pte) = physpage | pgprot_val(pgprot); return pte; } #define mk_pte(page, pgprot) \ ({ \ pte_t pte; \ pte_val(pte) = (((page - mem_map) << PAGE_SHIFT) + memory_start) | \ pgprot_val(pgprot); \ pte; \ }) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } /* * Atomic PTE updates. * * pte_update clears and sets bit atomically, and returns * the old pte value. * The ((unsigned long)(p+1) - 4) hack is to get to the least-significant * 32 bits of the PTE regardless of whether PTEs are 32 or 64 bits. */ static inline unsigned long pte_update(pte_t *p, unsigned long clr, unsigned long set) { unsigned long flags, old, tmp; raw_local_irq_save(flags); __asm__ __volatile__( "lw %0, %2, r0 \n" "andn %1, %0, %3 \n" "or %1, %1, %4 \n" "sw %1, %2, r0 \n" : "=&r" (old), "=&r" (tmp) : "r" ((unsigned long)(p + 1) - 4), "r" (clr), "r" (set) : "cc"); raw_local_irq_restore(flags); return old; } /* * set_pte stores a linux PTE into the linux page table. */ static inline void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { *ptep = pte; } static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { *ptep = pte; } #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) { return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0; } static inline int ptep_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { return (pte_update(ptep, \ (_PAGE_DIRTY | _PAGE_HWWRITE), 0) & _PAGE_DIRTY) != 0; } #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0)); } /*static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0); }*/ static inline void ptep_mkdirty(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_update(ptep, 0, _PAGE_DIRTY); } /*#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)*/ /* Convert pmd entry to page */ /* our pmd entry is an effective address of pte table*/ /* returns effective address of the pmd entry*/ static inline unsigned long pmd_page_vaddr(pmd_t pmd) { return ((unsigned long) (pmd_val(pmd) & PAGE_MASK)); } /* returns struct *page of the pmd entry*/ #define pmd_page(pmd) (pfn_to_page(__pa(pmd_val(pmd)) >> PAGE_SHIFT)) /* Find an entry in the third-level page table.. */ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* * 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, or the _PAGE_HASHPTE bit * (if used). -- paulus */ #define __swp_type(entry) ((entry).val & 0x3f) #define __swp_offset(entry) ((entry).val >> 6) #define __swp_entry(type, offset) \ ((swp_entry_t) { (type) | ((offset) << 6) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 2 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 2 }) extern unsigned long iopa(unsigned long addr); /* Values for nocacheflag and cmode */ /* These are not used by the APUS kernel_map, but prevents * compilation errors. */ #define IOMAP_FULL_CACHING 0 #define IOMAP_NOCACHE_SER 1 #define IOMAP_NOCACHE_NONSER 2 #define IOMAP_NO_COPYBACK 3 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ #define kern_addr_valid(addr) (1) void do_page_fault(struct pt_regs *regs, unsigned long address, unsigned long error_code); void mapin_ram(void); int map_page(unsigned long va, phys_addr_t pa, int flags); extern int mem_init_done; asmlinkage void __init mmu_init(void); void __init *early_get_page(void); #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #ifndef __ASSEMBLY__ extern unsigned long ioremap_bot, ioremap_base; void setup_memory(void); #endif /* __ASSEMBLY__ */ #endif /* _ASM_MICROBLAZE_PGTABLE_H */
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