diff options
Diffstat (limited to 'arch/nds32/mm/init.c')
| -rw-r--r-- | arch/nds32/mm/init.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/arch/nds32/mm/init.c b/arch/nds32/mm/init.c deleted file mode 100644 index f63f839738c4..000000000000 --- a/arch/nds32/mm/init.c +++ /dev/null @@ -1,263 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 1995-2005 Russell King -// Copyright (C) 2012 ARM Ltd. -// Copyright (C) 2013-2017 Andes Technology Corporation - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/swap.h> -#include <linux/init.h> -#include <linux/memblock.h> -#include <linux/mman.h> -#include <linux/nodemask.h> -#include <linux/initrd.h> -#include <linux/highmem.h> - -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/tlb.h> -#include <asm/page.h> - -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); -DEFINE_SPINLOCK(anon_alias_lock); -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; - -/* - * 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); - -static void __init zone_sizes_init(void) -{ - unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; - - max_zone_pfn[ZONE_NORMAL] = max_low_pfn; -#ifdef CONFIG_HIGHMEM - max_zone_pfn[ZONE_HIGHMEM] = max_pfn; -#endif - free_area_init(max_zone_pfn); - -} - -/* - * Map all physical memory under high_memory into kernel's address space. - * - * This is explicitly coded for two-level page tables, so if you need - * something else then this needs to change. - */ -static void __init map_ram(void) -{ - unsigned long v, p, e; - pgd_t *pge; - p4d_t *p4e; - pud_t *pue; - pmd_t *pme; - pte_t *pte; - /* These mark extents of read-only kernel pages... - * ...from vmlinux.lds.S - */ - - p = (u32) memblock_start_of_DRAM() & PAGE_MASK; - e = min((u32) memblock_end_of_DRAM(), (u32) __pa(high_memory)); - - v = (u32) __va(p); - pge = pgd_offset_k(v); - - while (p < e) { - int j; - p4e = p4d_offset(pge, v); - pue = pud_offset(p4e, v); - pme = pmd_offset(pue, v); - - if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) { - panic("%s: Kernel hardcoded for " - "two-level page tables", __func__); - } - - /* Alloc one page for holding PTE's... */ - pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!pte) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); - - /* Fill the newly allocated page with PTE'S */ - for (j = 0; p < e && j < PTRS_PER_PTE; - v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) { - /* Create mapping between p and v. */ - /* TODO: more fine grant for page access permission */ - set_pte(pte, __pte(p + pgprot_val(PAGE_KERNEL))); - } - - pge++; - } -} -static pmd_t *fixmap_pmd_p; -static void __init fixedrange_init(void) -{ - unsigned long vaddr; - pmd_t *pmd; -#ifdef CONFIG_HIGHMEM - pte_t *pte; -#endif /* CONFIG_HIGHMEM */ - - /* - * Fixed mappings: - */ - vaddr = __fix_to_virt(__end_of_fixed_addresses - 1); - pmd = pmd_off_k(vaddr); - fixmap_pmd_p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!fixmap_pmd_p) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE)); - -#ifdef CONFIG_HIGHMEM - /* - * Permanent kmaps: - */ - vaddr = PKMAP_BASE; - - pmd = pmd_off_k(vaddr); - pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!pte) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); - pkmap_page_table = pte; -#endif /* CONFIG_HIGHMEM */ -} - -/* - * 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) -{ - int i; - void *zero_page; - - pr_info("Setting up paging and PTEs.\n"); - /* clear out the init_mm.pgd that will contain the kernel's mappings */ - for (i = 0; i < PTRS_PER_PGD; i++) - swapper_pg_dir[i] = __pgd(1); - - map_ram(); - - fixedrange_init(); - - /* allocate space for empty_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); - zone_sizes_init(); - - empty_zero_page = virt_to_page(zero_page); - flush_dcache_page(empty_zero_page); -} - -static inline void __init free_highmem(void) -{ -#ifdef CONFIG_HIGHMEM - unsigned long pfn; - for (pfn = PFN_UP(__pa(high_memory)); pfn < max_pfn; pfn++) { - phys_addr_t paddr = (phys_addr_t) pfn << PAGE_SHIFT; - if (!memblock_is_reserved(paddr)) - free_highmem_page(pfn_to_page(pfn)); - } -#endif -} - -static void __init set_max_mapnr_init(void) -{ - max_mapnr = max_pfn; -} - -/* - * mem_init() marks the free areas in the mem_map and tells us how much - * memory is free. This is done after various parts of the system have - * claimed their memory after the kernel image. - */ -void __init mem_init(void) -{ - phys_addr_t memory_start = memblock_start_of_DRAM(); - BUG_ON(!mem_map); - set_max_mapnr_init(); - - free_highmem(); - - /* this will put all low memory onto the freelists */ - memblock_free_all(); - - pr_info("virtual kernel memory layout:\n" - " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#ifdef CONFIG_HIGHMEM - " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#endif - " consist : 0x%08lx - 0x%08lx (%4ld MB)\n" - " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" - " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" - " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", - FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10, -#ifdef CONFIG_HIGHMEM - PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, - (LAST_PKMAP * PAGE_SIZE) >> 10, -#endif - CONSISTENT_BASE, CONSISTENT_END, - ((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START, - (unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20, - (unsigned long)__va(memory_start), (unsigned long)high_memory, - ((unsigned long)high_memory - - (unsigned long)__va(memory_start)) >> 20, - (unsigned long)&__init_begin, (unsigned long)&__init_end, - ((unsigned long)&__init_end - - (unsigned long)&__init_begin) >> 10, (unsigned long)&_etext, - (unsigned long)&_edata, - ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, - (unsigned long)&_text, (unsigned long)&_etext, - ((unsigned long)&_etext - (unsigned long)&_text) >> 10); - - /* - * Check boundaries twice: Some fundamental inconsistencies can - * be detected at build time already. - */ -#ifdef CONFIG_HIGHMEM - BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START); - BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE); -#endif - BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); - BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); - -#ifdef CONFIG_HIGHMEM - BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START); - BUG_ON(CONSISTENT_END > PKMAP_BASE); -#endif - BUG_ON(VMALLOC_END > CONSISTENT_BASE); - BUG_ON(VMALLOC_START >= VMALLOC_END); - BUG_ON((unsigned long)high_memory > VMALLOC_START); - - return; -} - -void __set_fixmap(enum fixed_addresses idx, - phys_addr_t phys, pgprot_t flags) -{ - unsigned long addr = __fix_to_virt(idx); - pte_t *pte; - - BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); - - pte = (pte_t *)&fixmap_pmd_p[pte_index(addr)]; - - if (pgprot_val(flags)) { - set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); - } else { - pte_clear(&init_mm, addr, pte); - flush_tlb_kernel_range(addr, addr + PAGE_SIZE); - } -} |