Файловый менеджер

Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/arch/mips/include/asm/pgtable-32.h

Назад
/* * 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, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. / #ifndef _ASM_PGTABLE_32_H #define _ASM_PGTABLE_32_H #include <asm/addrspace.h> #include <asm/page.h> #include <linux/linkage.h> #include <asm/cachectl.h> #include <asm/fixmap.h> #define __ARCH_USE_5LEVEL_HACK #include <asm-generic/pgtable-nopmd.h> #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> #endif / * Regarding 32-bit MIPS huge page support (and the tradeoff it entails): * * We use the same huge page sizes as 64-bit MIPS. Assuming a 4KB page size, * our 2-level table layout would normally have a PGD entry cover a contiguous * 4MB virtual address region (pointing to a 4KB PTE page of 1,024 32-bit pte_t * pointers, each pointing to a 4KB physical page). The problem is that 4MB, * spanning both halves of a TLB EntryLo0,1 pair, requires 2MB hardware page * support, not one of the standard supported sizes (1MB,4MB,16MB,...). * To correct for this, when huge pages are enabled, we halve the number of * pointers a PTE page holds, making its last half go to waste. Correspondingly, * we double the number of PGD pages. Overall, page table memory overhead * increases to match 64-bit MIPS, but PTE lookups remain CPU cache-friendly. * * NOTE: We don't yet support huge pages if extended-addressing is enabled * (i.e. EVA, XPA, 36-bit Alchemy/Netlogic). / extern int temp_tlb_entry; / * - add_temporary_entry() add a temporary TLB entry. We use TLB entries * starting at the top and working down. This is for populating the * TLB before trap_init() puts the TLB miss handler in place. It * should be used only for entries matching the actual page tables, * to prevent inconsistencies. / extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1, unsigned long entryhi, unsigned long pagemask); / * Basically we have the same two-level (which is the logical three level * Linux page table layout folded) page tables as the i386. Some day * when we have proper page coloring support we can have a 1% quicker * tlb refill handling mechanism, but for now it is a bit slower but * works even with the cache aliasing problem the R4k and above have. / / PGDIR_SHIFT determines what a third-level page table entry can map / #if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) # define PGDIR_SHIFT (2 PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2 - 1) #else # define PGDIR_SHIFT (2 * PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2) #endif #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * Entries per page directory level: we use two-level, so * we don't really have any PUD/PMD directory physically. / #if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) # define __PGD_ORDER (32 - 3 PAGE_SHIFT + PGD_T_LOG2 + PTE_T_LOG2 + 1) #else # define __PGD_ORDER (32 - 3 * PAGE_SHIFT + PGD_T_LOG2 + PTE_T_LOG2) #endif #define PGD_ORDER (__PGD_ORDER >= 0 ? __PGD_ORDER : 0) #define PUD_ORDER aieeee_attempt_to_allocate_pud #define PMD_ORDER aieeee_attempt_to_allocate_pmd #define PTE_ORDER 0 #define PTRS_PER_PGD (USER_PTRS_PER_PGD * 2) #if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) # define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t) / 2) #else # define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) #endif #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE) #define FIRST_USER_ADDRESS 0UL #define VMALLOC_START MAP_BASE #define PKMAP_END ((FIXADDR_START) & ~((LAST_PKMAP << PAGE_SHIFT)-1)) #define PKMAP_BASE (PKMAP_END - PAGE_SIZE * LAST_PKMAP) #ifdef CONFIG_HIGHMEM # define VMALLOC_END (PKMAP_BASE-2PAGE_SIZE) #else # define VMALLOC_END (FIXADDR_START-2PAGE_SIZE) #endif #ifdef CONFIG_PHYS_ADDR_T_64BIT #define pte_ERROR(e) \ printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e)) #else #define pte_ERROR(e) \ printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) #endif #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) extern void load_pgd(unsigned long pg_dir); extern pte_t invalid_pte_table[PTRS_PER_PTE]; /* * Empty pgd/pmd entries point to the invalid_pte_table. / static inline int pmd_none(pmd_t pmd) { return pmd_val(pmd) == (unsigned long) invalid_pte_table; } static inline int pmd_bad(pmd_t pmd) { #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT / pmd_huge(pmd) but inline / if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) return 0; #endif if (unlikely(pmd_val(pmd) & ~PAGE_MASK)) return 1; return 0; } static inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) != (unsigned long) invalid_pte_table; } static inline void pmd_clear(pmd_t pmdp) { pmd_val(pmdp) = ((unsigned long) invalid_pte_table); } #if defined(CONFIG_XPA) #define MAX_POSSIBLE_PHYSMEM_BITS 40 #define pte_pfn(x) (((unsigned long)((x).pte_high >> _PFN_SHIFT)) \| (unsigned long)((x).pte_low << _PAGE_PRESENT_SHIFT)) static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot) { pte_t pte; pte.pte_low = (pfn >> _PAGE_PRESENT_SHIFT) \| (pgprot_val(prot) & ~_PFNX_MASK); pte.pte_high = (pfn << _PFN_SHIFT) \| (pgprot_val(prot) & ~_PFN_MASK); return pte; } #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) #define MAX_POSSIBLE_PHYSMEM_BITS 36 #define pte_pfn(x) ((unsigned long)((x).pte_high >> 6)) static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot) { pte_t pte; pte.pte_high = (pfn << 6) \| (pgprot_val(prot) & 0x3f); pte.pte_low = pgprot_val(prot); return pte; } #else #define MAX_POSSIBLE_PHYSMEM_BITS 32 #ifdef CONFIG_CPU_VR41XX #define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2))) #define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) \| pgprot_val(prot)) #else #define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT)) #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << _PFN_SHIFT) \| pgprot_val(prot)) #define pfn_pmd(pfn, prot) __pmd(((unsigned long long)(pfn) << _PFN_SHIFT) \| pgprot_val(prot)) #endif #endif / defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) / #define pte_page(x) pfn_to_page(pte_pfn(x)) #define __pgd_offset(address) pgd_index(address) #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) / to find an entry in a kernel page-table-directory / #define pgd_offset_k(address) pgd_offset(&init_mm, address) #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) / to find an entry in a page-table-directory / #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) / Find an entry in the third-level page table.. / #define __pte_offset(address) \ (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) #define pte_offset(dir, address) \ ((pte_t ) pmd_page_vaddr((dir)) + __pte_offset(address)) #define pte_offset_kernel(dir, address) \ ((pte_t ) pmd_page_vaddr((dir)) + __pte_offset(address)) #define pte_offset_map(dir, address) \ ((pte_t )page_address(pmd_page((dir))) + __pte_offset(address)) #define pte_unmap(pte) ((void)(pte)) #if defined(CONFIG_CPU_R3K_TLB) / Swap entries must have VALID bit cleared. / #define __swp_type(x) (((x).val >> 10) & 0x1f) #define __swp_offset(x) ((x).val >> 15) #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 10) \| ((offset) << 15) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #else #if defined(CONFIG_XPA) / Swap entries must have VALID and GLOBAL bits cleared. / #define __swp_type(x) (((x).val >> 4) & 0x1f) #define __swp_offset(x) ((x).val >> 9) #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 4) \| ((offset) << 9) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t) { 0, (x).val }) #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) / Swap entries must have VALID and GLOBAL bits cleared. / #define __swp_type(x) (((x).val >> 2) & 0x1f) #define __swp_offset(x) ((x).val >> 7) #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 2) \| ((offset) << 7) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t) { 0, (x).val }) #else / * Constraints: * _PAGE_PRESENT at bit 0 * _PAGE_MODIFIED at bit 4 * _PAGE_GLOBAL at bit 6 * _PAGE_VALID at bit 7 / #define __swp_type(x) (((x).val >> 8) & 0x1f) #define __swp_offset(x) ((x).val >> 13) #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 8) \| ((offset) << 13) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #endif / defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) / #endif / defined(CONFIG_CPU_R3K_TLB) / #endif / _ASM_PGTABLE_32_H */

| ver. 1.4 | Github | . | PHP 7.4.3-4ubuntu2.24 | Генерация страницы: 0 | proxy | phpinfo | Настройка