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Diffstat (limited to 'arch/mips/include/asm/page.h')
| -rw-r--r-- | arch/mips/include/asm/page.h | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h new file mode 100644 index 000000000..96bc798c1 --- /dev/null +++ b/arch/mips/include/asm/page.h @@ -0,0 +1,273 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + */ +#ifndef _ASM_PAGE_H +#define _ASM_PAGE_H + +#include <spaces.h> +#include <linux/const.h> +#include <linux/kernel.h> +#include <asm/mipsregs.h> + +/* + * PAGE_SHIFT determines the page size + */ +#ifdef CONFIG_PAGE_SIZE_4KB +#define PAGE_SHIFT 12 +#endif +#ifdef CONFIG_PAGE_SIZE_8KB +#define PAGE_SHIFT 13 +#endif +#ifdef CONFIG_PAGE_SIZE_16KB +#define PAGE_SHIFT 14 +#endif +#ifdef CONFIG_PAGE_SIZE_32KB +#define PAGE_SHIFT 15 +#endif +#ifdef CONFIG_PAGE_SIZE_64KB +#define PAGE_SHIFT 16 +#endif +#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) +#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) + +/* + * This is used for calculating the real page sizes + * for FTLB or VTLB + FTLB configurations. + */ +static inline unsigned int page_size_ftlb(unsigned int mmuextdef) +{ + switch (mmuextdef) { + case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: + if (PAGE_SIZE == (1 << 30)) + return 5; + if (PAGE_SIZE == (1llu << 32)) + return 6; + if (PAGE_SIZE > (256 << 10)) + return 7; /* reserved */ + fallthrough; + case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: + return (PAGE_SHIFT - 10) / 2; + default: + panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n", + mmuextdef >> 14); + } +} + +#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT +#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) +#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) +#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */ +#define HPAGE_SHIFT ({BUILD_BUG(); 0; }) +#define HPAGE_SIZE ({BUILD_BUG(); 0; }) +#define HPAGE_MASK ({BUILD_BUG(); 0; }) +#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) +#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ + +#include <linux/pfn.h> + +extern void build_clear_page(void); +extern void build_copy_page(void); + +/* + * It's normally defined only for FLATMEM config but it's + * used in our early mem init code for all memory models. + * So always define it. + */ +#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET +extern unsigned long ARCH_PFN_OFFSET; +# define ARCH_PFN_OFFSET ARCH_PFN_OFFSET +#else +# define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) +#endif + +extern void clear_page(void * page); +extern void copy_page(void * to, void * from); + +extern unsigned long shm_align_mask; + +static inline unsigned long pages_do_alias(unsigned long addr1, + unsigned long addr2) +{ + return (addr1 ^ addr2) & shm_align_mask; +} + +struct page; + +static inline void clear_user_page(void *addr, unsigned long vaddr, + struct page *page) +{ + extern void (*flush_data_cache_page)(unsigned long addr); + + clear_page(addr); + if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) + flush_data_cache_page((unsigned long)addr); +} + +struct vm_area_struct; +extern void copy_user_highpage(struct page *to, struct page *from, + unsigned long vaddr, struct vm_area_struct *vma); + +#define __HAVE_ARCH_COPY_USER_HIGHPAGE + +/* + * These are used to make use of C type-checking.. + */ +#ifdef CONFIG_PHYS_ADDR_T_64BIT + #ifdef CONFIG_CPU_MIPS32 + typedef struct { unsigned long pte_low, pte_high; } pte_t; + #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) + #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) + #else + typedef struct { unsigned long long pte; } pte_t; + #define pte_val(x) ((x).pte) + #define __pte(x) ((pte_t) { (x) } ) + #endif +#else +typedef struct { unsigned long pte; } pte_t; +#define pte_val(x) ((x).pte) +#define __pte(x) ((pte_t) { (x) } ) +#endif +typedef struct page *pgtable_t; + +/* + * Right now we don't support 4-level pagetables, so all pud-related + * definitions come from <asm-generic/pgtable-nopud.h>. + */ + +/* + * Finall the top of the hierarchy, the pgd + */ +typedef struct { unsigned long pgd; } pgd_t; +#define pgd_val(x) ((x).pgd) +#define __pgd(x) ((pgd_t) { (x) } ) + +/* + * Manipulate page protection bits + */ +typedef struct { unsigned long pgprot; } pgprot_t; +#define pgprot_val(x) ((x).pgprot) +#define __pgprot(x) ((pgprot_t) { (x) } ) +#define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) + +/* + * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd + * pair of pages we only have a single global bit per pair of pages. When + * writing to the TLB make sure we always have the bit set for both pages + * or none. This macro is used to access the `buddy' of the pte we're just + * working on. + */ +#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) + +/* + * __pa()/__va() should be used only during mem init. + */ +static inline unsigned long ___pa(unsigned long x) +{ + if (IS_ENABLED(CONFIG_64BIT)) { + /* + * For MIPS64 the virtual address may either be in one of + * the compatibility segements ckseg0 or ckseg1, or it may + * be in xkphys. + */ + return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x); + } + + if (!IS_ENABLED(CONFIG_EVA)) { + /* + * We're using the standard MIPS32 legacy memory map, ie. + * the address x is going to be in kseg0 or kseg1. We can + * handle either case by masking out the desired bits using + * CPHYSADDR. + */ + return CPHYSADDR(x); + } + + /* + * EVA is in use so the memory map could be anything, making it not + * safe to just mask out bits. + */ + return x - PAGE_OFFSET + PHYS_OFFSET; +} +#define __pa(x) ___pa((unsigned long)(x)) +#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) +#include <asm/io.h> + +/* + * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad + * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The + * discussion can be found in + * https://lore.kernel.org/lkml/a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com + * + * It is unclear if the misscompilations mentioned in + * https://lore.kernel.org/lkml/1281303490-390-1-git-send-email-namhyung@gmail.com + * also affect MIPS so we keep this one until GCC 3.x has been retired + * before we can apply https://patchwork.linux-mips.org/patch/1541/ + */ +#define __pa_symbol_nodebug(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) + +#ifdef CONFIG_DEBUG_VIRTUAL +extern phys_addr_t __phys_addr_symbol(unsigned long x); +#else +#define __phys_addr_symbol(x) __pa_symbol_nodebug(x) +#endif + +#ifndef __pa_symbol +#define __pa_symbol(x) __phys_addr_symbol((unsigned long)(x)) +#endif + +#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) + +#ifdef CONFIG_FLATMEM + +static inline int pfn_valid(unsigned long pfn) +{ + /* avoid <linux/mm.h> include hell */ + extern unsigned long max_mapnr; + unsigned long pfn_offset = ARCH_PFN_OFFSET; + + return pfn >= pfn_offset && pfn < max_mapnr; +} + +#elif defined(CONFIG_SPARSEMEM) + +/* pfn_valid is defined in linux/mmzone.h */ + +#elif defined(CONFIG_NUMA) + +#define pfn_valid(pfn) \ +({ \ + unsigned long __pfn = (pfn); \ + int __n = pfn_to_nid(__pfn); \ + ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ + NODE_DATA(__n)->node_spanned_pages) \ + : 0); \ +}) + +#endif + +#define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) +#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) + +extern bool __virt_addr_valid(const volatile void *kaddr); +#define virt_addr_valid(kaddr) \ + __virt_addr_valid((const volatile void *) (kaddr)) + +#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC + +extern unsigned long __kaslr_offset; +static inline unsigned long kaslr_offset(void) +{ + return __kaslr_offset; +} + +#include <asm-generic/memory_model.h> +#include <asm-generic/getorder.h> + +#endif /* _ASM_PAGE_H */ |