From: Greg Ungerer <[email protected]> The ColdFire V4e MMU is nothing line any of the other m68k MMU's. So we need to create a set of definitions and support routines for kernel's paging functions.
This is largely taken from Freescales BSP code for this (though it was a 2.6.25 kernel). I have done some cleanups, and it probably needs a little more. Signed-off-by: Greg Ungerer <[email protected]> --- arch/m68k/include/asm/mcf_pgtable.h | 380 +++++++++++++++++++++++++++++++++++ 1 files changed, 380 insertions(+), 0 deletions(-) create mode 100644 arch/m68k/include/asm/mcf_pgtable.h diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h new file mode 100644 index 0000000..c3aeb41 --- /dev/null +++ b/arch/m68k/include/asm/mcf_pgtable.h @@ -0,0 +1,380 @@ +#ifndef CF_PGTABLE_H +#define CF_PGTABLE_H + +#include <asm/mcfmmu.h> +#include <asm/page.h> + +#ifndef __ASSEMBLY__ +#include <linux/linkage.h> +#include <asm/virtconvert.h> + +/* + * For virtual address to physical address conversion. + */ +#define VTOP(addr) __pa(addr) +#define PTOV(addr) __va(addr) + +#endif /* !__ASSEMBLY__ */ + +/* + * Page protection values within PTE. + */ + +/* + * MMUDR bits, in proper place. + */ +#define CF_PAGE_LOCKED 0x00000002 +#define CF_PAGE_EXEC 0x00000004 +#define CF_PAGE_WRITABLE 0x00000008 +#define CF_PAGE_READABLE 0x00000010 +#define CF_PAGE_SYSTEM 0x00000020 +#define CF_PAGE_COPYBACK 0x00000040 +#define CF_PAGE_NOCACHE 0x00000080 + +#define CF_CACHEMASK (~0x00000040) +#define CF_PAGE_MMUDR_MASK 0x000000fe + +#define _PAGE_NOCACHE030 CF_PAGE_NOCACHE + +/* + * MMUTR bits, need shifting down. + */ +#define CF_PAGE_VALID 0x00000400 +#define CF_PAGE_SHARED 0x00000800 + +#define CF_PAGE_MMUTR_MASK 0x00000c00 +#define CF_PAGE_MMUTR_SHIFT 10 +#define CF_ASID_MMU_SHIFT 2 + +/* + * Fake bits, not implemented in CF, will get masked out before + * hitting hardware, and might go away altogether once this port is + * complete. + */ +#if PAGE_SHIFT < 13 +#error COLDFIRE Error: Pages must be at least 8k in size +#endif +#define CF_PAGE_ACCESSED 0x00001000 +#define CF_PAGE_FILE 0x00000200 +#define CF_PAGE_DIRTY 0x00000001 + +#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ +#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ +#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ +#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ +#define _DESCTYPE_MASK 0x003 +#define _CACHEMASK040 (~0x060) +#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ + +/* + * Externally used page protection values. + */ +#define _PAGE_PRESENT (CF_PAGE_VALID) +#define _PAGE_ACCESSED (CF_PAGE_ACCESSED) +#define _PAGE_DIRTY (CF_PAGE_DIRTY) +#define _PAGE_READWRITE (CF_PAGE_WRITABLE \ + | CF_PAGE_READABLE \ + | CF_PAGE_SYSTEM \ + | CF_PAGE_SHARED) + +/* Compound page protection values. */ +#define PAGE_NONE __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED) + +#define PAGE_SHARED __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED) + +#define PAGE_INIT __pgprot(CF_PAGE_VALID \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC \ + | CF_PAGE_SYSTEM \ + | CF_PAGE_SHARED) + +#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC \ + | CF_PAGE_SYSTEM \ + | CF_PAGE_SHARED \ + | CF_PAGE_ACCESSED) + +#define PAGE_COPY __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_READABLE \ + | CF_PAGE_DIRTY) + +/* + * Page protections for initialising protection_map. See mm/mmap.c + * for use. In general, the bit positions are xwr, and P-items are + * private, the S-items are shared. + */ + +#define __P000 PAGE_NONE +#define __P100 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_EXEC) +#define __P010 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_ACCESSED) +#define __P110 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_EXEC) +#define __P001 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_READABLE) +#define __P101 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC) +#define __P011 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_READABLE \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_ACCESSED) +#define __P111 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_WRITABLE \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC) + +#define __S000 PAGE_NONE +#define __S100 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_EXEC) +#define __S010 PAGE_SHARED +#define __S110 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_EXEC) +#define __S001 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_READABLE) +#define __S101 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC) +#define __S011 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_READABLE) +#define __S111 __pgprot(CF_PAGE_VALID \ + | CF_PAGE_ACCESSED \ + | CF_PAGE_SHARED \ + | CF_PAGE_READABLE \ + | CF_PAGE_EXEC) + +#define PTE_MASK PAGE_MASK +#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY) + +#ifndef __ASSEMBLY__ + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ +#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) + +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) +{ + pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot); + return pte; +} + +#define pmd_set(pmdp, ptep) do {} while (0) + +static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) +{ + pgd_val(*pgdp) = virt_to_phys(pmdp); +} + +#define __pte_page(pte) \ + ((unsigned long) ((pte_val(pte) & CF_PAGE_PGNUM_MASK) + PAGE_OFFSET)) +#define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd))) + +static inline int pte_none(pte_t pte) +{ + return !pte_val(pte); +} +static inline int pte_present(pte_t pte) +{ + return pte_val(pte) & CF_PAGE_VALID; +} +static inline void pte_clear(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + pte_val(*ptep) = 0; +} + +#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT) +#define pte_page(pte) virt_to_page(__pte_page(pte)) + +static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); } +#define pmd_none(pmd) pmd_none2(&(pmd)) +static inline int pmd_bad2(pmd_t *pmd) { return 0; } +#define pmd_bad(pmd) pmd_bad2(&(pmd)) +#define pmd_present(pmd) (!pmd_none2(&(pmd))) +static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; } + +static inline int pgd_none(pgd_t pgd) { return 0; } +static inline int pgd_bad(pgd_t pgd) { return 0; } +static inline int pgd_present(pgd_t pgd) { return 1; } +static inline void pgd_clear(pgd_t *pgdp) {} + +#define pte_ERROR(e) \ + printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \ + __FILE__, __LINE__, pte_val(e)) +#define pmd_ERROR(e) \ + printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \ + __FILE__, __LINE__, pmd_val(e)) +#define pgd_ERROR(e) \ + printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \ + __FILE__, __LINE__, pgd_val(e)) + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not... + * [we have the full set here even if they don't change from m68k] + */ +static inline int pte_read(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_READABLE; } +static inline int pte_write(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_WRITABLE; } +static inline int pte_exec(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_EXEC; } +static inline int pte_dirty(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_DIRTY; } +static inline int pte_young(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_ACCESSED; } +static inline int pte_file(pte_t pte) \ + { return pte_val(pte) & CF_PAGE_FILE; } +static inline int pte_special(pte_t pte) \ + { return 0; } + +static inline pte_t pte_wrprotect(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_WRITABLE; return pte; } +static inline pte_t pte_rdprotect(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_READABLE; return pte; } +static inline pte_t pte_exprotect(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_EXEC; return pte; } +static inline pte_t pte_mkclean(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_DIRTY; return pte; } +static inline pte_t pte_mkold(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_ACCESSED; return pte; } +static inline pte_t pte_mkwrite(pte_t pte) \ + { pte_val(pte) |= CF_PAGE_WRITABLE; return pte; } +static inline pte_t pte_mkread(pte_t pte) \ + { pte_val(pte) |= CF_PAGE_READABLE; return pte; } +static inline pte_t pte_mkexec(pte_t pte) \ + { pte_val(pte) |= CF_PAGE_EXEC; return pte; } +static inline pte_t pte_mkdirty(pte_t pte) \ + { pte_val(pte) |= CF_PAGE_DIRTY; return pte; } +static inline pte_t pte_mkyoung(pte_t pte) \ + { pte_val(pte) |= CF_PAGE_ACCESSED; return pte; } +static inline pte_t pte_mknocache(pte_t pte) \ + { pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); return pte; } +static inline pte_t pte_mkcache(pte_t pte) \ + { pte_val(pte) &= ~CF_PAGE_NOCACHE; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) \ + { return pte; } + +#define swapper_pg_dir kernel_pg_dir +extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; + +/* + * Find an entry in a pagetable directory. + */ +#define pgd_index(address) ((address) >> PGDIR_SHIFT) + +#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) + +/* + * Find an entry in a kernel pagetable directory. + */ +#define pgd_offset_k(address) pgd_offset(&init_mm, address) + +/* + * Find an entry in the second-level pagetable. + */ +static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address) +{ + return (pmd_t *) pgd; +} + +/* + * Find an entry in the third-level pagetable. + */ +#define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) ((pte_t *) __pmd_page(*(dir)) + \ + __pte_offset(address)) + +/* + * Disable caching for page at given kernel virtual address. + */ +static inline void nocache_page(void *vaddr) +{ + pgd_t *dir; + pmd_t *pmdp; + pte_t *ptep; + unsigned long addr = (unsigned long) vaddr; + + dir = pgd_offset_k(addr); + pmdp = pmd_offset(dir, addr); + ptep = pte_offset_kernel(pmdp, addr); + *ptep = pte_mknocache(*ptep); +} + +/* + * Enable caching for page at given kernel virtual address. + */ +static inline void cache_page(void *vaddr) +{ + pgd_t *dir; + pmd_t *pmdp; + pte_t *ptep; + unsigned long addr = (unsigned long) vaddr; + + dir = pgd_offset_k(addr); + pmdp = pmd_offset(dir, addr); + ptep = pte_offset_kernel(pmdp, addr); + *ptep = pte_mkcache(*ptep); +} + +#define PTE_FILE_MAX_BITS 21 +#define PTE_FILE_SHIFT 11 + +static inline unsigned long pte_to_pgoff(pte_t pte) +{ + return pte_val(pte) >> PTE_FILE_SHIFT; +} + +static inline pte_t pgoff_to_pte(unsigned pgoff) +{ + return __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE); +} + +/* + * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) + */ +#define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ + (offset << PTE_FILE_SHIFT) }) +#define __swp_type(x) ((x).val & 0xFF) +#define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) (__pte((x).val)) + +#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) + +#define pte_offset_map(pmdp, address) ((pte_t *)__pmd_page(*pmdp) + \ + __pte_offset(address)) +#define pte_unmap(pte) ((void)0) + +#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) +#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) + +#endif /* !__ASSEMBLY__ */ +#endif /* CF_PGTABLE_H */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
