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206 lines
7.4 KiB
206 lines
7.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _MOTOROLA_PGTABLE_H |
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#define _MOTOROLA_PGTABLE_H |
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/* |
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* Definitions for MMU descriptors |
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*/ |
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#define _PAGE_PRESENT 0x001 |
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#define _PAGE_SHORT 0x002 |
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#define _PAGE_RONLY 0x004 |
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#define _PAGE_READWRITE 0x000 |
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#define _PAGE_ACCESSED 0x008 |
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#define _PAGE_DIRTY 0x010 |
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#define _PAGE_SUPER 0x080 /* 68040 supervisor only */ |
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#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ |
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#define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ |
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#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ |
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#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ |
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#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ |
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#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ |
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#define _DESCTYPE_MASK 0x003 |
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#define _CACHEMASK040 (~0x060) |
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/* |
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* Currently set to the minimum alignment of table pointers (256 bytes). |
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* The hardware only uses the low 4 bits for state: |
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* |
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* 3 - Used |
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* 2 - Write Protected |
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* 0,1 - Descriptor Type |
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* |
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* and has the rest of the bits reserved. |
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*/ |
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#define _TABLE_MASK (0xffffff00) |
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#define _PAGE_TABLE (_PAGE_SHORT) |
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) |
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#define _PAGE_PROTNONE 0x004 |
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#ifndef __ASSEMBLY__ |
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/* This is the cache mode to be used for pages containing page descriptors for |
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* processors >= '040. It is in pte_mknocache(), and the variable is defined |
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* and initialized in head.S */ |
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extern int m68k_pgtable_cachemode; |
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/* This is the cache mode for normal pages, for supervisor access on |
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* processors >= '040. It is used in pte_mkcache(), and the variable is |
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* defined and initialized in head.S */ |
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#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH) |
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#define m68k_supervisor_cachemode _PAGE_CACHE040W |
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#elif defined(CPU_M68040_OR_M68060_ONLY) |
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#define m68k_supervisor_cachemode _PAGE_CACHE040 |
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#elif defined(CPU_M68020_OR_M68030_ONLY) |
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#define m68k_supervisor_cachemode 0 |
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#else |
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extern int m68k_supervisor_cachemode; |
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#endif |
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#if defined(CPU_M68040_OR_M68060_ONLY) |
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#define mm_cachebits _PAGE_CACHE040 |
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#elif defined(CPU_M68020_OR_M68030_ONLY) |
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#define mm_cachebits 0 |
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#else |
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extern unsigned long mm_cachebits; |
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#endif |
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits) |
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) |
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) |
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) |
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) |
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/* Alternate definitions that are compile time constants, for |
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initializing protection_map. The cachebits are fixed later. */ |
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#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) |
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#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) |
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#define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) |
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#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) |
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/* |
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* The m68k can't do page protection for execute, and considers that the same are read. |
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* Also, write permissions imply read permissions. This is the closest we can get.. |
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*/ |
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#define __P000 PAGE_NONE_C |
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#define __P001 PAGE_READONLY_C |
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#define __P010 PAGE_COPY_C |
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#define __P011 PAGE_COPY_C |
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#define __P100 PAGE_READONLY_C |
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#define __P101 PAGE_READONLY_C |
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#define __P110 PAGE_COPY_C |
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#define __P111 PAGE_COPY_C |
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#define __S000 PAGE_NONE_C |
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#define __S001 PAGE_READONLY_C |
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#define __S010 PAGE_SHARED_C |
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#define __S011 PAGE_SHARED_C |
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#define __S100 PAGE_READONLY_C |
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#define __S101 PAGE_READONLY_C |
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#define __S110 PAGE_SHARED_C |
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#define __S111 PAGE_SHARED_C |
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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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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
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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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static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) |
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{ |
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pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; |
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} |
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static inline void pud_set(pud_t *pudp, pmd_t *pmdp) |
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{ |
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pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); |
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} |
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#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) |
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#define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) |
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#define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK)) |
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#define pte_none(pte) (!pte_val(pte)) |
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#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
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#define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; }) |
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#define pte_page(pte) virt_to_page(__va(pte_val(pte))) |
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#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) |
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#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
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#define pmd_none(pmd) (!pmd_val(pmd)) |
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#define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) |
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#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) |
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#define pmd_clear(pmdp) ({ pmd_val(*pmdp) = 0; }) |
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/* |
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* m68k does not have huge pages (020/030 actually could), but generic code |
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* expects pmd_page() to exists, only to then DCE it all. Provide a dummy to |
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* make the compiler happy. |
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*/ |
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#define pmd_page(pmd) NULL |
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#define pud_none(pud) (!pud_val(pud)) |
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#define pud_bad(pud) ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE) |
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#define pud_present(pud) (pud_val(pud) & _PAGE_TABLE) |
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#define pud_clear(pudp) ({ pud_val(*pudp) = 0; }) |
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#define pud_page(pud) (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT)) |
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#define pte_ERROR(e) \ |
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printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
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#define pmd_ERROR(e) \ |
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printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
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#define pgd_ERROR(e) \ |
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printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
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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_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } |
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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 pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } |
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static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } |
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static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } |
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static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } |
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static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } |
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static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } |
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static inline pte_t pte_mknocache(pte_t pte) |
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{ |
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pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; |
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return pte; |
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} |
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static inline pte_t pte_mkcache(pte_t pte) |
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{ |
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pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; |
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return pte; |
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} |
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#define swapper_pg_dir kernel_pg_dir |
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extern pgd_t kernel_pg_dir[128]; |
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/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ |
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#define __swp_type(x) (((x).val >> 4) & 0xff) |
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#define __swp_offset(x) ((x).val >> 12) |
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#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) }) |
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _MOTOROLA_PGTABLE_H */
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