/* * 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 */ #define PAGE_SHIFT CONFIG_PAGE_SHIFT #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 segments 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) #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 */