| /* |
| * 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 <linux/dma-mapping.h> |
| #include <linux/dma-contiguous.h> |
| |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/sizes.h> |
| #include <asm/tlb.h> |
| |
| #include "mm.h" |
| |
| phys_addr_t memstart_addr __read_mostly = 0; |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| static int __init early_initrd(char *p) |
| { |
| unsigned long start, size; |
| char *endp; |
| |
| start = memparse(p, &endp); |
| if (*endp == ',') { |
| size = memparse(endp + 1, NULL); |
| |
| initrd_start = (unsigned long)__va(start); |
| initrd_end = (unsigned long)__va(start + size); |
| } |
| return 0; |
| } |
| early_param("initrd", early_initrd); |
| #endif |
| |
| 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_dma = min; |
| |
| memset(zone_size, 0, sizeof(zone_size)); |
| |
| /* 4GB maximum for 32-bit only capable devices */ |
| if (IS_ENABLED(CONFIG_ZONE_DMA)) { |
| unsigned long max_dma_phys = |
| (unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1); |
| max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT)); |
| zone_size[ZONE_DMA] = max_dma - min; |
| } |
| zone_size[ZONE_NORMAL] = max - max_dma; |
| |
| 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; |
| |
| if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { |
| unsigned long dma_end = min(end, max_dma); |
| zhole_size[ZONE_DMA] -= dma_end - start; |
| } |
| |
| if (end > max_dma) { |
| unsigned long normal_end = min(end, max); |
| unsigned long normal_start = max(start, max_dma); |
| 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) |
| { |
| phys_addr_t dma_phys_limit = 0; |
| |
| /* |
| * Register the kernel text, kernel data, initrd, and initial |
| * pagetables with memblock. |
| */ |
| memblock_reserve(__pa(_text), _end - _text); |
| #ifdef CONFIG_BLK_DEV_INITRD |
| if (initrd_start) |
| memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); |
| #endif |
| |
| early_init_fdt_scan_reserved_mem(); |
| |
| /* 4GB maximum for 32-bit only capable devices */ |
| if (IS_ENABLED(CONFIG_ZONE_DMA)) |
| dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1; |
| dma_contiguous_reserve(dma_phys_limit); |
| |
| 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; |
| } |
| |
| #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) |
| { |
| max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
| |
| #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| free_unused_memmap(); |
| #endif |
| /* this will put all unused low memory onto the freelists */ |
| free_all_bootmem(); |
| |
| mem_init_print_info(NULL); |
| |
| #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 && get_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) |
| { |
| free_initmem_default(0); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| |
| static int keep_initrd; |
| |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| if (!keep_initrd) |
| free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
| } |
| |
| static int __init keepinitrd_setup(char *__unused) |
| { |
| keep_initrd = 1; |
| return 1; |
| } |
| |
| __setup("keepinitrd", keepinitrd_setup); |
| #endif |