diff options
Diffstat (limited to 'arch/arm64/mm/init.c')
| -rw-r--r-- | arch/arm64/mm/init.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c new file mode 100644 index 00000000000..5f719ba949b --- /dev/null +++ b/arch/arm64/mm/init.c @@ -0,0 +1,437 @@ +/* + * Based on arch/arm/mm/init.c + * + * Copyright (C) 1995-2005 Russell King + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/errno.h> +#include <linux/swap.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/mman.h> +#include <linux/nodemask.h> +#include <linux/initrd.h> +#include <linux/gfp.h> +#include <linux/memblock.h> +#include <linux/sort.h> +#include <linux/of_fdt.h> + +#include <asm/prom.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/sizes.h> +#include <asm/tlb.h> + +#include "mm.h" + +static unsigned long phys_initrd_start __initdata = 0; +static unsigned long phys_initrd_size __initdata = 0; + +phys_addr_t memstart_addr __read_mostly = 0; + +void __init early_init_dt_setup_initrd_arch(unsigned long start, + unsigned long end) +{ + phys_initrd_start = start; + phys_initrd_size = end - start; +} + +static int __init early_initrd(char *p) +{ + unsigned long start, size; + char *endp; + + start = memparse(p, &endp); + if (*endp == ',') { + size = memparse(endp + 1, NULL); + + phys_initrd_start = start; + phys_initrd_size = size; + } + return 0; +} +early_param("initrd", early_initrd); + +#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) + +static void __init zone_sizes_init(unsigned long min, unsigned long max) +{ + struct memblock_region *reg; + unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; + unsigned long max_dma32 = min; + + memset(zone_size, 0, sizeof(zone_size)); + +#ifdef CONFIG_ZONE_DMA32 + /* 4GB maximum for 32-bit only capable devices */ + max_dma32 = min(max, MAX_DMA32_PFN); + zone_size[ZONE_DMA32] = max_dma32 - min; +#endif + zone_size[ZONE_NORMAL] = max - max_dma32; + + memcpy(zhole_size, zone_size, sizeof(zhole_size)); + + for_each_memblock(memory, reg) { + unsigned long start = memblock_region_memory_base_pfn(reg); + unsigned long end = memblock_region_memory_end_pfn(reg); + + if (start >= max) + continue; +#ifdef CONFIG_ZONE_DMA32 + if (start < max_dma32) { + unsigned long dma_end = min(end, max_dma32); + zhole_size[ZONE_DMA32] -= dma_end - start; + } +#endif + if (end > max_dma32) { + unsigned long normal_end = min(end, max); + unsigned long normal_start = max(start, max_dma32); + zhole_size[ZONE_NORMAL] -= normal_end - normal_start; + } + } + + free_area_init_node(0, zone_size, min, zhole_size); +} + +#ifdef CONFIG_HAVE_ARCH_PFN_VALID +int pfn_valid(unsigned long pfn) +{ + return memblock_is_memory(pfn << PAGE_SHIFT); +} +EXPORT_SYMBOL(pfn_valid); +#endif + +#ifndef CONFIG_SPARSEMEM +static void arm64_memory_present(void) +{ +} +#else +static void arm64_memory_present(void) +{ + struct memblock_region *reg; + + for_each_memblock(memory, reg) + memory_present(0, memblock_region_memory_base_pfn(reg), + memblock_region_memory_end_pfn(reg)); +} +#endif + +void __init arm64_memblock_init(void) +{ + u64 *reserve_map, base, size; + + /* Register the kernel text, kernel data and initrd with memblock */ + memblock_reserve(__pa(_text), _end - _text); +#ifdef CONFIG_BLK_DEV_INITRD + if (phys_initrd_size) { + memblock_reserve(phys_initrd_start, phys_initrd_size); + + /* Now convert initrd to virtual addresses */ + initrd_start = __phys_to_virt(phys_initrd_start); + initrd_end = initrd_start + phys_initrd_size; + } +#endif + + /* + * Reserve the page tables. These are already in use, + * and can only be in node 0. + */ + memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); + memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); + + /* Reserve the dtb region */ + memblock_reserve(virt_to_phys(initial_boot_params), + be32_to_cpu(initial_boot_params->totalsize)); + + /* + * Process the reserve map. This will probably overlap the initrd + * and dtb locations which are already reserved, but overlapping + * doesn't hurt anything + */ + reserve_map = ((void*)initial_boot_params) + + be32_to_cpu(initial_boot_params->off_mem_rsvmap); + while (1) { + base = be64_to_cpup(reserve_map++); + size = be64_to_cpup(reserve_map++); + if (!size) + break; + memblock_reserve(base, size); + } + + memblock_allow_resize(); + memblock_dump_all(); +} + +void __init bootmem_init(void) +{ + unsigned long min, max; + + min = PFN_UP(memblock_start_of_DRAM()); + max = PFN_DOWN(memblock_end_of_DRAM()); + + /* + * Sparsemem tries to allocate bootmem in memory_present(), so must be + * done after the fixed reservations. + */ + arm64_memory_present(); + + sparse_init(); + zone_sizes_init(min, max); + + high_memory = __va((max << PAGE_SHIFT) - 1) + 1; + max_pfn = max_low_pfn = max; +} + +static inline int free_area(unsigned long pfn, unsigned long end, char *s) +{ + unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); + + for (; pfn < end; pfn++) { + struct page *page = pfn_to_page(pfn); + ClearPageReserved(page); + init_page_count(page); + __free_page(page); + pages++; + } + + if (size && s) + pr_info("Freeing %s memory: %dK\n", s, size); + + return pages; +} + +/* + * Poison init memory with an undefined instruction (0x0). + */ +static inline void poison_init_mem(void *s, size_t count) +{ + memset(s, 0, count); +} + +#ifndef CONFIG_SPARSEMEM_VMEMMAP +static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) +{ + struct page *start_pg, *end_pg; + unsigned long pg, pgend; + + /* + * Convert start_pfn/end_pfn to a struct page pointer. + */ + start_pg = pfn_to_page(start_pfn - 1) + 1; + end_pg = pfn_to_page(end_pfn - 1) + 1; + + /* + * Convert to physical addresses, and round start upwards and end + * downwards. + */ + pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); + pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; + + /* + * If there are free pages between these, free the section of the + * memmap array. + */ + if (pg < pgend) + free_bootmem(pg, pgend - pg); +} + +/* + * The mem_map array can get very big. Free the unused area of the memory map. + */ +static void __init free_unused_memmap(void) +{ + unsigned long start, prev_end = 0; + struct memblock_region *reg; + + for_each_memblock(memory, reg) { + start = __phys_to_pfn(reg->base); + +#ifdef CONFIG_SPARSEMEM + /* + * Take care not to free memmap entries that don't exist due + * to SPARSEMEM sections which aren't present. + */ + start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); +#endif + /* + * If we had a previous bank, and there is a space between the + * current bank and the previous, free it. + */ + if (prev_end && prev_end < start) + free_memmap(prev_end, start); + + /* + * Align up here since the VM subsystem insists that the + * memmap entries are valid from the bank end aligned to + * MAX_ORDER_NR_PAGES. + */ + prev_end = ALIGN(start + __phys_to_pfn(reg->size), + MAX_ORDER_NR_PAGES); + } + +#ifdef CONFIG_SPARSEMEM + if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) + free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); +#endif +} +#endif /* !CONFIG_SPARSEMEM_VMEMMAP */ + +/* + * 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) +{ + unsigned long reserved_pages, free_pages; + struct memblock_region *reg; + +#if CONFIG_SWIOTLB + extern void __init arm64_swiotlb_init(size_t max_size); + arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1)); +#endif + + max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; + +#ifndef CONFIG_SPARSEMEM_VMEMMAP + /* this will put all unused low memory onto the freelists */ + free_unused_memmap(); +#endif + + totalram_pages += free_all_bootmem(); + + reserved_pages = free_pages = 0; + + for_each_memblock(memory, reg) { + unsigned int pfn1, pfn2; + struct page *page, *end; + + pfn1 = __phys_to_pfn(reg->base); + pfn2 = pfn1 + __phys_to_pfn(reg->size); + + page = pfn_to_page(pfn1); + end = pfn_to_page(pfn2 - 1) + 1; + + do { + if (PageReserved(page)) + reserved_pages++; + else if (!page_count(page)) + free_pages++; + page++; + } while (page < end); + } + + /* + * Since our memory may not be contiguous, calculate the real number + * of pages we have in this system. + */ + pr_info("Memory:"); + num_physpages = 0; + for_each_memblock(memory, reg) { + unsigned long pages = memblock_region_memory_end_pfn(reg) - + memblock_region_memory_base_pfn(reg); + num_physpages += pages; + printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); + } + printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); + + pr_notice("Memory: %luk/%luk available, %luk reserved\n", + nr_free_pages() << (PAGE_SHIFT-10), + free_pages << (PAGE_SHIFT-10), + reserved_pages << (PAGE_SHIFT-10)); + +#define MLK(b, t) b, t, ((t) - (b)) >> 10 +#define MLM(b, t) b, t, ((t) - (b)) >> 20 +#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) + + pr_notice("Virtual kernel memory layout:\n" + " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" +#ifdef CONFIG_SPARSEMEM_VMEMMAP + " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" +#endif + " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" + " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" + " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" + " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" + " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", + MLM(VMALLOC_START, VMALLOC_END), +#ifdef CONFIG_SPARSEMEM_VMEMMAP + MLM((unsigned long)virt_to_page(PAGE_OFFSET), + (unsigned long)virt_to_page(high_memory)), +#endif + MLM(MODULES_VADDR, MODULES_END), + MLM(PAGE_OFFSET, (unsigned long)high_memory), + + MLK_ROUNDUP(__init_begin, __init_end), + MLK_ROUNDUP(_text, _etext), + MLK_ROUNDUP(_sdata, _edata)); + +#undef MLK +#undef MLM +#undef MLK_ROUNDUP + + /* + * Check boundaries twice: Some fundamental inconsistencies can be + * detected at build time already. + */ +#ifdef CONFIG_COMPAT + BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); +#endif + BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); + BUG_ON(TASK_SIZE_64 > MODULES_VADDR); + + if (PAGE_SIZE >= 16384 && num_physpages <= 128) { + extern int sysctl_overcommit_memory; + /* + * On a machine this small we won't get anywhere without + * overcommit, so turn it on by default. + */ + sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; + } +} + +void free_initmem(void) +{ + poison_init_mem(__init_begin, __init_end - __init_begin); + totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), + __phys_to_pfn(__pa(__init_end)), + "init"); +} + +#ifdef CONFIG_BLK_DEV_INITRD + +static int keep_initrd; + +void free_initrd_mem(unsigned long start, unsigned long end) +{ + if (!keep_initrd) { + poison_init_mem((void *)start, PAGE_ALIGN(end) - start); + totalram_pages += free_area(__phys_to_pfn(__pa(start)), + __phys_to_pfn(__pa(end)), + "initrd"); + } +} + +static int __init keepinitrd_setup(char *__unused) +{ + keep_initrd = 1; + return 1; +} + +__setup("keepinitrd", keepinitrd_setup); +#endif |