diff options
Diffstat (limited to 'arch/unicore32/mm/mmu.c')
| -rw-r--r-- | arch/unicore32/mm/mmu.c | 513 |
1 files changed, 0 insertions, 513 deletions
diff --git a/arch/unicore32/mm/mmu.c b/arch/unicore32/mm/mmu.c deleted file mode 100644 index 183d5b056814..000000000000 --- a/arch/unicore32/mm/mmu.c +++ /dev/null @@ -1,513 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/unicore32/mm/mmu.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Copyright (C) 2001-2010 GUAN Xue-tao - */ -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/mman.h> -#include <linux/nodemask.h> -#include <linux/memblock.h> -#include <linux/fs.h> -#include <linux/io.h> - -#include <asm/cputype.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <linux/sizes.h> -#include <asm/tlb.h> -#include <asm/memblock.h> - -#include <mach/map.h> - -#include "mm.h" - -/* - * empty_zero_page is a special page that is used for - * zero-initialized data and COW. - */ -struct page *empty_zero_page; -EXPORT_SYMBOL(empty_zero_page); - -/* - * The pmd table for the upper-most set of pages. - */ -pmd_t *top_pmd; - -pgprot_t pgprot_user; -EXPORT_SYMBOL(pgprot_user); - -pgprot_t pgprot_kernel; -EXPORT_SYMBOL(pgprot_kernel); - -static int __init noalign_setup(char *__unused) -{ - cr_alignment &= ~CR_A; - cr_no_alignment &= ~CR_A; - set_cr(cr_alignment); - return 1; -} -__setup("noalign", noalign_setup); - -void adjust_cr(unsigned long mask, unsigned long set) -{ - unsigned long flags; - - mask &= ~CR_A; - - set &= mask; - - local_irq_save(flags); - - cr_no_alignment = (cr_no_alignment & ~mask) | set; - cr_alignment = (cr_alignment & ~mask) | set; - - set_cr((get_cr() & ~mask) | set); - - local_irq_restore(flags); -} - -struct map_desc { - unsigned long virtual; - unsigned long pfn; - unsigned long length; - unsigned int type; -}; - -#define PROT_PTE_DEVICE (PTE_PRESENT | PTE_YOUNG | \ - PTE_DIRTY | PTE_READ | PTE_WRITE) -#define PROT_SECT_DEVICE (PMD_TYPE_SECT | PMD_PRESENT | \ - PMD_SECT_READ | PMD_SECT_WRITE) - -static struct mem_type mem_types[] = { - [MT_DEVICE] = { /* Strongly ordered */ - .prot_pte = PROT_PTE_DEVICE, - .prot_l1 = PMD_TYPE_TABLE | PMD_PRESENT, - .prot_sect = PROT_SECT_DEVICE, - }, - /* - * MT_KUSER: pte for vecpage -- cacheable, - * and sect for unigfx mmap -- noncacheable - */ - [MT_KUSER] = { - .prot_pte = PTE_PRESENT | PTE_YOUNG | PTE_DIRTY | - PTE_CACHEABLE | PTE_READ | PTE_EXEC, - .prot_l1 = PMD_TYPE_TABLE | PMD_PRESENT, - .prot_sect = PROT_SECT_DEVICE, - }, - [MT_HIGH_VECTORS] = { - .prot_pte = PTE_PRESENT | PTE_YOUNG | PTE_DIRTY | - PTE_CACHEABLE | PTE_READ | PTE_WRITE | - PTE_EXEC, - .prot_l1 = PMD_TYPE_TABLE | PMD_PRESENT, - }, - [MT_MEMORY] = { - .prot_pte = PTE_PRESENT | PTE_YOUNG | PTE_DIRTY | - PTE_WRITE | PTE_EXEC, - .prot_l1 = PMD_TYPE_TABLE | PMD_PRESENT, - .prot_sect = PMD_TYPE_SECT | PMD_PRESENT | PMD_SECT_CACHEABLE | - PMD_SECT_READ | PMD_SECT_WRITE | PMD_SECT_EXEC, - }, - [MT_ROM] = { - .prot_sect = PMD_TYPE_SECT | PMD_PRESENT | PMD_SECT_CACHEABLE | - PMD_SECT_READ, - }, -}; - -const struct mem_type *get_mem_type(unsigned int type) -{ - return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL; -} -EXPORT_SYMBOL(get_mem_type); - -/* - * Adjust the PMD section entries according to the CPU in use. - */ -static void __init build_mem_type_table(void) -{ - pgprot_user = __pgprot(PTE_PRESENT | PTE_YOUNG | PTE_CACHEABLE); - pgprot_kernel = __pgprot(PTE_PRESENT | PTE_YOUNG | - PTE_DIRTY | PTE_READ | PTE_WRITE | - PTE_EXEC | PTE_CACHEABLE); -} - -#define vectors_base() (vectors_high() ? 0xffff0000 : 0) - -static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, - unsigned long prot) -{ - if (pmd_none(*pmd)) { - size_t size = PTRS_PER_PTE * sizeof(pte_t); - pte_t *pte = memblock_alloc(size, size); - - if (!pte) - panic("%s: Failed to allocate %zu bytes align=%zx\n", - __func__, size, size); - - __pmd_populate(pmd, __pa(pte) | prot); - } - BUG_ON(pmd_bad(*pmd)); - return pte_offset_kernel(pmd, addr); -} - -static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr, - unsigned long end, unsigned long pfn, - const struct mem_type *type) -{ - pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1); - do { - set_pte(pte, pfn_pte(pfn, __pgprot(type->prot_pte))); - pfn++; - } while (pte++, addr += PAGE_SIZE, addr != end); -} - -static void __init alloc_init_section(pgd_t *pgd, unsigned long addr, - unsigned long end, unsigned long phys, - const struct mem_type *type) -{ - pmd_t *pmd = pmd_offset((pud_t *)pgd, addr); - - /* - * Try a section mapping - end, addr and phys must all be aligned - * to a section boundary. - */ - if (((addr | end | phys) & ~SECTION_MASK) == 0) { - pmd_t *p = pmd; - - do { - set_pmd(pmd, __pmd(phys | type->prot_sect)); - phys += SECTION_SIZE; - } while (pmd++, addr += SECTION_SIZE, addr != end); - - flush_pmd_entry(p); - } else { - /* - * No need to loop; pte's aren't interested in the - * individual L1 entries. - */ - alloc_init_pte(pmd, addr, end, __phys_to_pfn(phys), type); - } -} - -/* - * Create the page directory entries and any necessary - * page tables for the mapping specified by `md'. We - * are able to cope here with varying sizes and address - * offsets, and we take full advantage of sections. - */ -static void __init create_mapping(struct map_desc *md) -{ - unsigned long phys, addr, length, end; - const struct mem_type *type; - pgd_t *pgd; - - if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) { - printk(KERN_WARNING "BUG: not creating mapping for " - "0x%08llx at 0x%08lx in user region\n", - __pfn_to_phys((u64)md->pfn), md->virtual); - return; - } - - if ((md->type == MT_DEVICE || md->type == MT_ROM) && - md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) { - printk(KERN_WARNING "BUG: mapping for 0x%08llx at 0x%08lx " - "overlaps vmalloc space\n", - __pfn_to_phys((u64)md->pfn), md->virtual); - } - - type = &mem_types[md->type]; - - addr = md->virtual & PAGE_MASK; - phys = (unsigned long)__pfn_to_phys(md->pfn); - length = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK)); - - if (type->prot_l1 == 0 && ((addr | phys | length) & ~SECTION_MASK)) { - printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not " - "be mapped using pages, ignoring.\n", - __pfn_to_phys(md->pfn), addr); - return; - } - - pgd = pgd_offset_k(addr); - end = addr + length; - do { - unsigned long next = pgd_addr_end(addr, end); - - alloc_init_section(pgd, addr, next, phys, type); - - phys += next - addr; - addr = next; - } while (pgd++, addr != end); -} - -static void * __initdata vmalloc_min = (void *)(VMALLOC_END - SZ_128M); - -/* - * vmalloc=size forces the vmalloc area to be exactly 'size' - * bytes. This can be used to increase (or decrease) the vmalloc - * area - the default is 128m. - */ -static int __init early_vmalloc(char *arg) -{ - unsigned long vmalloc_reserve = memparse(arg, NULL); - - if (vmalloc_reserve < SZ_16M) { - vmalloc_reserve = SZ_16M; - printk(KERN_WARNING - "vmalloc area too small, limiting to %luMB\n", - vmalloc_reserve >> 20); - } - - if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) { - vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M); - printk(KERN_WARNING - "vmalloc area is too big, limiting to %luMB\n", - vmalloc_reserve >> 20); - } - - vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve); - return 0; -} -early_param("vmalloc", early_vmalloc); - -static phys_addr_t lowmem_limit __initdata = SZ_1G; - -static void __init sanity_check_meminfo(void) -{ - int i, j; - - lowmem_limit = __pa(vmalloc_min - 1) + 1; - memblock_set_current_limit(lowmem_limit); - - for (i = 0, j = 0; i < meminfo.nr_banks; i++) { - struct membank *bank = &meminfo.bank[j]; - *bank = meminfo.bank[i]; - j++; - } - meminfo.nr_banks = j; -} - -static inline void prepare_page_table(void) -{ - unsigned long addr; - phys_addr_t end; - - /* - * Clear out all the mappings below the kernel image. - */ - for (addr = 0; addr < MODULES_VADDR; addr += PGDIR_SIZE) - pmd_clear(pmd_off_k(addr)); - - for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) - pmd_clear(pmd_off_k(addr)); - - /* - * Find the end of the first block of lowmem. - */ - end = memblock.memory.regions[0].base + memblock.memory.regions[0].size; - if (end >= lowmem_limit) - end = lowmem_limit; - - /* - * Clear out all the kernel space mappings, except for the first - * memory bank, up to the end of the vmalloc region. - */ - for (addr = __phys_to_virt(end); - addr < VMALLOC_END; addr += PGDIR_SIZE) - pmd_clear(pmd_off_k(addr)); -} - -/* - * Reserve the special regions of memory - */ -void __init uc32_mm_memblock_reserve(void) -{ - /* - * Reserve the page tables. These are already in use, - * and can only be in node 0. - */ - memblock_reserve(__pa(swapper_pg_dir), PTRS_PER_PGD * sizeof(pgd_t)); -} - -/* - * Set up device the mappings. Since we clear out the page tables for all - * mappings above VMALLOC_END, we will remove any debug device mappings. - * This means you have to be careful how you debug this function, or any - * called function. This means you can't use any function or debugging - * method which may touch any device, otherwise the kernel _will_ crash. - */ -static void __init devicemaps_init(void) -{ - struct map_desc map; - unsigned long addr; - void *vectors; - - /* - * Allocate the vector page early. - */ - vectors = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!vectors) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - - for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) - pmd_clear(pmd_off_k(addr)); - - /* - * Create a mapping for the machine vectors at the high-vectors - * location (0xffff0000). If we aren't using high-vectors, also - * create a mapping at the low-vectors virtual address. - */ - map.pfn = __phys_to_pfn(virt_to_phys(vectors)); - map.virtual = VECTORS_BASE; - map.length = PAGE_SIZE; - map.type = MT_HIGH_VECTORS; - create_mapping(&map); - - /* - * Create a mapping for the kuser page at the special - * location (0xbfff0000) to the same vectors location. - */ - map.pfn = __phys_to_pfn(virt_to_phys(vectors)); - map.virtual = KUSER_VECPAGE_BASE; - map.length = PAGE_SIZE; - map.type = MT_KUSER; - create_mapping(&map); - - /* - * Finally flush the caches and tlb to ensure that we're in a - * consistent state wrt the writebuffer. This also ensures that - * any write-allocated cache lines in the vector page are written - * back. After this point, we can start to touch devices again. - */ - local_flush_tlb_all(); - flush_cache_all(); -} - -static void __init map_lowmem(void) -{ - struct memblock_region *reg; - - /* Map all the lowmem memory banks. */ - for_each_memblock(memory, reg) { - phys_addr_t start = reg->base; - phys_addr_t end = start + reg->size; - struct map_desc map; - - if (end > lowmem_limit) - end = lowmem_limit; - if (start >= end) - break; - - map.pfn = __phys_to_pfn(start); - map.virtual = __phys_to_virt(start); - map.length = end - start; - map.type = MT_MEMORY; - - create_mapping(&map); - } -} - -/* - * paging_init() sets up the page tables, initialises the zone memory - * maps, and sets up the zero page, bad page and bad page tables. - */ -void __init paging_init(void) -{ - void *zero_page; - - build_mem_type_table(); - sanity_check_meminfo(); - prepare_page_table(); - map_lowmem(); - devicemaps_init(); - - top_pmd = pmd_off_k(0xffff0000); - - /* allocate the zero page. */ - zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!zero_page) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - - bootmem_init(); - - empty_zero_page = virt_to_page(zero_page); - __flush_dcache_page(NULL, empty_zero_page); -} - -/* - * In order to soft-boot, we need to insert a 1:1 mapping in place of - * the user-mode pages. This will then ensure that we have predictable - * results when turning the mmu off - */ -void setup_mm_for_reboot(void) -{ - unsigned long base_pmdval; - pgd_t *pgd; - int i; - - /* - * We need to access to user-mode page tables here. For kernel threads - * we don't have any user-mode mappings so we use the context that we - * "borrowed". - */ - pgd = current->active_mm->pgd; - - base_pmdval = PMD_SECT_WRITE | PMD_SECT_READ | PMD_TYPE_SECT; - - for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) { - unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval; - pmd_t *pmd; - - pmd = pmd_off(pgd, i << PGDIR_SHIFT); - set_pmd(pmd, __pmd(pmdval)); - flush_pmd_entry(pmd); - } - - local_flush_tlb_all(); -} - -/* - * Take care of architecture specific things when placing a new PTE into - * a page table, or changing an existing PTE. Basically, there are two - * things that we need to take care of: - * - * 1. If PG_dcache_clean is not set for the page, we need to ensure - * that any cache entries for the kernels virtual memory - * range are written back to the page. - * 2. If we have multiple shared mappings of the same space in - * an object, we need to deal with the cache aliasing issues. - * - * Note that the pte lock will be held. - */ -void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, - pte_t *ptep) -{ - unsigned long pfn = pte_pfn(*ptep); - struct address_space *mapping; - struct page *page; - - if (!pfn_valid(pfn)) - return; - - /* - * The zero page is never written to, so never has any dirty - * cache lines, and therefore never needs to be flushed. - */ - page = pfn_to_page(pfn); - if (page == ZERO_PAGE(0)) - return; - - mapping = page_mapping_file(page); - if (!test_and_set_bit(PG_dcache_clean, &page->flags)) - __flush_dcache_page(mapping, page); - if (mapping) - if (vma->vm_flags & VM_EXEC) - __flush_icache_all(); -} |