| /* |
| * linux/arch/arm/mm/init.c |
| * |
| * Copyright (C) 1995-2005 Russell King |
| * |
| * 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. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/swap.h> |
| #include <linux/init.h> |
| #include <linux/bootmem.h> |
| #include <linux/mman.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sched/task.h> |
| #include <linux/export.h> |
| #include <linux/nodemask.h> |
| #include <linux/initrd.h> |
| #include <linux/of_fdt.h> |
| #include <linux/highmem.h> |
| #include <linux/gfp.h> |
| #include <linux/memblock.h> |
| #include <linux/dma-contiguous.h> |
| #include <linux/sizes.h> |
| #include <linux/stop_machine.h> |
| |
| #include <asm/cp15.h> |
| #include <asm/mach-types.h> |
| #include <asm/memblock.h> |
| #include <asm/memory.h> |
| #include <asm/prom.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/system_info.h> |
| #include <asm/tlb.h> |
| #include <asm/fixmap.h> |
| |
| #include <asm/mach/arch.h> |
| #include <asm/mach/map.h> |
| |
| #include "mm.h" |
| |
| #ifdef CONFIG_CPU_CP15_MMU |
| unsigned long __init __clear_cr(unsigned long mask) |
| { |
| cr_alignment = cr_alignment & ~mask; |
| return cr_alignment; |
| } |
| #endif |
| |
| static phys_addr_t phys_initrd_start __initdata = 0; |
| static unsigned long phys_initrd_size __initdata = 0; |
| |
| static int __init early_initrd(char *p) |
| { |
| phys_addr_t start; |
| unsigned long 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); |
| |
| static int __init parse_tag_initrd(const struct tag *tag) |
| { |
| pr_warn("ATAG_INITRD is deprecated; " |
| "please update your bootloader.\n"); |
| phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD, parse_tag_initrd); |
| |
| static int __init parse_tag_initrd2(const struct tag *tag) |
| { |
| phys_initrd_start = tag->u.initrd.start; |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
| |
| static void __init find_limits(unsigned long *min, unsigned long *max_low, |
| unsigned long *max_high) |
| { |
| *max_low = PFN_DOWN(memblock_get_current_limit()); |
| *min = PFN_UP(memblock_start_of_DRAM()); |
| *max_high = PFN_DOWN(memblock_end_of_DRAM()); |
| } |
| |
| #ifdef CONFIG_ZONE_DMA |
| |
| phys_addr_t arm_dma_zone_size __read_mostly; |
| EXPORT_SYMBOL(arm_dma_zone_size); |
| |
| /* |
| * The DMA mask corresponding to the maximum bus address allocatable |
| * using GFP_DMA. The default here places no restriction on DMA |
| * allocations. This must be the smallest DMA mask in the system, |
| * so a successful GFP_DMA allocation will always satisfy this. |
| */ |
| phys_addr_t arm_dma_limit; |
| unsigned long arm_dma_pfn_limit; |
| |
| static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
| unsigned long dma_size) |
| { |
| if (size[0] <= dma_size) |
| return; |
| |
| size[ZONE_NORMAL] = size[0] - dma_size; |
| size[ZONE_DMA] = dma_size; |
| hole[ZONE_NORMAL] = hole[0]; |
| hole[ZONE_DMA] = 0; |
| } |
| #endif |
| |
| void __init setup_dma_zone(const struct machine_desc *mdesc) |
| { |
| #ifdef CONFIG_ZONE_DMA |
| if (mdesc->dma_zone_size) { |
| arm_dma_zone_size = mdesc->dma_zone_size; |
| arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
| } else |
| arm_dma_limit = 0xffffffff; |
| arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
| #endif |
| } |
| |
| static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
| unsigned long max_high) |
| { |
| unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| struct memblock_region *reg; |
| |
| /* |
| * initialise the zones. |
| */ |
| memset(zone_size, 0, sizeof(zone_size)); |
| |
| /* |
| * The memory size has already been determined. If we need |
| * to do anything fancy with the allocation of this memory |
| * to the zones, now is the time to do it. |
| */ |
| zone_size[0] = max_low - min; |
| #ifdef CONFIG_HIGHMEM |
| zone_size[ZONE_HIGHMEM] = max_high - max_low; |
| #endif |
| |
| /* |
| * Calculate the size of the holes. |
| * holes = node_size - sum(bank_sizes) |
| */ |
| 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_low) { |
| unsigned long low_end = min(end, max_low); |
| zhole_size[0] -= low_end - start; |
| } |
| #ifdef CONFIG_HIGHMEM |
| if (end > max_low) { |
| unsigned long high_start = max(start, max_low); |
| zhole_size[ZONE_HIGHMEM] -= end - high_start; |
| } |
| #endif |
| } |
| |
| #ifdef CONFIG_ZONE_DMA |
| /* |
| * Adjust the sizes according to any special requirements for |
| * this machine type. |
| */ |
| if (arm_dma_zone_size) |
| arm_adjust_dma_zone(zone_size, zhole_size, |
| arm_dma_zone_size >> PAGE_SHIFT); |
| #endif |
| |
| 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_map_memory(__pfn_to_phys(pfn)); |
| } |
| EXPORT_SYMBOL(pfn_valid); |
| #endif |
| |
| #ifndef CONFIG_SPARSEMEM |
| static void __init arm_memory_present(void) |
| { |
| } |
| #else |
| static void __init arm_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 |
| |
| static bool arm_memblock_steal_permitted = true; |
| |
| phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
| { |
| phys_addr_t phys; |
| |
| BUG_ON(!arm_memblock_steal_permitted); |
| |
| phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
| memblock_free(phys, size); |
| memblock_remove(phys, size); |
| |
| return phys; |
| } |
| |
| static void __init arm_initrd_init(void) |
| { |
| #ifdef CONFIG_BLK_DEV_INITRD |
| phys_addr_t start; |
| unsigned long size; |
| |
| /* FDT scan will populate initrd_start */ |
| if (initrd_start && !phys_initrd_size) { |
| phys_initrd_start = __virt_to_phys(initrd_start); |
| phys_initrd_size = initrd_end - initrd_start; |
| } |
| |
| initrd_start = initrd_end = 0; |
| |
| if (!phys_initrd_size) |
| return; |
| |
| /* |
| * Round the memory region to page boundaries as per free_initrd_mem() |
| * This allows us to detect whether the pages overlapping the initrd |
| * are in use, but more importantly, reserves the entire set of pages |
| * as we don't want these pages allocated for other purposes. |
| */ |
| start = round_down(phys_initrd_start, PAGE_SIZE); |
| size = phys_initrd_size + (phys_initrd_start - start); |
| size = round_up(size, PAGE_SIZE); |
| |
| if (!memblock_is_region_memory(start, size)) { |
| pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
| (u64)start, size); |
| return; |
| } |
| |
| if (memblock_is_region_reserved(start, size)) { |
| pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
| (u64)start, size); |
| return; |
| } |
| |
| memblock_reserve(start, size); |
| |
| /* Now convert initrd to virtual addresses */ |
| initrd_start = __phys_to_virt(phys_initrd_start); |
| initrd_end = initrd_start + phys_initrd_size; |
| #endif |
| } |
| |
| void __init arm_memblock_init(const struct machine_desc *mdesc) |
| { |
| /* Register the kernel text, kernel data and initrd with memblock. */ |
| memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START); |
| |
| arm_initrd_init(); |
| |
| arm_mm_memblock_reserve(); |
| |
| /* reserve any platform specific memblock areas */ |
| if (mdesc->reserve) |
| mdesc->reserve(); |
| |
| early_init_fdt_reserve_self(); |
| early_init_fdt_scan_reserved_mem(); |
| |
| /* reserve memory for DMA contiguous allocations */ |
| dma_contiguous_reserve(arm_dma_limit); |
| |
| arm_memblock_steal_permitted = false; |
| memblock_dump_all(); |
| } |
| |
| void __init bootmem_init(void) |
| { |
| unsigned long min, max_low, max_high; |
| |
| memblock_allow_resize(); |
| max_low = max_high = 0; |
| |
| find_limits(&min, &max_low, &max_high); |
| |
| early_memtest((phys_addr_t)min << PAGE_SHIFT, |
| (phys_addr_t)max_low << PAGE_SHIFT); |
| |
| /* |
| * Sparsemem tries to allocate bootmem in memory_present(), |
| * so must be done after the fixed reservations |
| */ |
| arm_memory_present(); |
| |
| /* |
| * sparse_init() needs the bootmem allocator up and running. |
| */ |
| sparse_init(); |
| |
| /* |
| * Now free the memory - free_area_init_node needs |
| * the sparse mem_map arrays initialized by sparse_init() |
| * for memmap_init_zone(), otherwise all PFNs are invalid. |
| */ |
| zone_sizes_init(min, max_low, max_high); |
| |
| /* |
| * This doesn't seem to be used by the Linux memory manager any |
| * more, but is used by ll_rw_block. If we can get rid of it, we |
| * also get rid of some of the stuff above as well. |
| */ |
| min_low_pfn = min; |
| max_low_pfn = max_low; |
| max_pfn = max_high; |
| } |
| |
| /* |
| * Poison init memory with an undefined instruction (ARM) or a branch to an |
| * undefined instruction (Thumb). |
| */ |
| static inline void poison_init_mem(void *s, size_t count) |
| { |
| u32 *p = (u32 *)s; |
| for (; count != 0; count -= 4) |
| *p++ = 0xe7fddef0; |
| } |
| |
| static inline void |
| free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| { |
| struct page *start_pg, *end_pg; |
| phys_addr_t 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 = PAGE_ALIGN(__pa(start_pg)); |
| pgend = __pa(end_pg) & PAGE_MASK; |
| |
| /* |
| * If there are free pages between these, |
| * free the section of the memmap array. |
| */ |
| if (pg < pgend) |
| memblock_free_early(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; |
| |
| /* |
| * This relies on each bank being in address order. |
| * The banks are sorted previously in bootmem_init(). |
| */ |
| for_each_memblock(memory, reg) { |
| start = memblock_region_memory_base_pfn(reg); |
| |
| #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)); |
| #else |
| /* |
| * Align down here since the VM subsystem insists that the |
| * memmap entries are valid from the bank start aligned to |
| * MAX_ORDER_NR_PAGES. |
| */ |
| start = round_down(start, MAX_ORDER_NR_PAGES); |
| #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(memblock_region_memory_end_pfn(reg), |
| 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 |
| } |
| |
| #ifdef CONFIG_HIGHMEM |
| static inline void free_area_high(unsigned long pfn, unsigned long end) |
| { |
| for (; pfn < end; pfn++) |
| free_highmem_page(pfn_to_page(pfn)); |
| } |
| #endif |
| |
| static void __init free_highpages(void) |
| { |
| #ifdef CONFIG_HIGHMEM |
| unsigned long max_low = max_low_pfn; |
| struct memblock_region *mem, *res; |
| |
| /* set highmem page free */ |
| for_each_memblock(memory, mem) { |
| unsigned long start = memblock_region_memory_base_pfn(mem); |
| unsigned long end = memblock_region_memory_end_pfn(mem); |
| |
| /* Ignore complete lowmem entries */ |
| if (end <= max_low) |
| continue; |
| |
| if (memblock_is_nomap(mem)) |
| continue; |
| |
| /* Truncate partial highmem entries */ |
| if (start < max_low) |
| start = max_low; |
| |
| /* Find and exclude any reserved regions */ |
| for_each_memblock(reserved, res) { |
| unsigned long res_start, res_end; |
| |
| res_start = memblock_region_reserved_base_pfn(res); |
| res_end = memblock_region_reserved_end_pfn(res); |
| |
| if (res_end < start) |
| continue; |
| if (res_start < start) |
| res_start = start; |
| if (res_start > end) |
| res_start = end; |
| if (res_end > end) |
| res_end = end; |
| if (res_start != start) |
| free_area_high(start, res_start); |
| start = res_end; |
| if (start == end) |
| break; |
| } |
| |
| /* And now free anything which remains */ |
| if (start < end) |
| free_area_high(start, end); |
| } |
| #endif |
| } |
| |
| /* |
| * 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) |
| { |
| #ifdef CONFIG_HAVE_TCM |
| /* These pointers are filled in on TCM detection */ |
| extern u32 dtcm_end; |
| extern u32 itcm_end; |
| #endif |
| |
| set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
| |
| /* this will put all unused low memory onto the freelists */ |
| free_unused_memmap(); |
| free_all_bootmem(); |
| |
| #ifdef CONFIG_SA1111 |
| /* now that our DMA memory is actually so designated, we can free it */ |
| free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
| #endif |
| |
| free_highpages(); |
| |
| 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" |
| " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| #ifdef CONFIG_HAVE_TCM |
| " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| #endif |
| " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #ifdef CONFIG_HIGHMEM |
| " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #endif |
| #ifdef CONFIG_MODULES |
| " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #endif |
| " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
| " .init : 0x%p" " - 0x%p" " (%4td kB)\n" |
| " .data : 0x%p" " - 0x%p" " (%4td kB)\n" |
| " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", |
| |
| MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE), |
| #ifdef CONFIG_HAVE_TCM |
| MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
| MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
| #endif |
| MLK(FIXADDR_START, FIXADDR_END), |
| MLM(VMALLOC_START, VMALLOC_END), |
| MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| #ifdef CONFIG_HIGHMEM |
| MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
| (PAGE_SIZE)), |
| #endif |
| #ifdef CONFIG_MODULES |
| MLM(MODULES_VADDR, MODULES_END), |
| #endif |
| |
| MLK_ROUNDUP(_text, _etext), |
| MLK_ROUNDUP(__init_begin, __init_end), |
| MLK_ROUNDUP(_sdata, _edata), |
| MLK_ROUNDUP(__bss_start, __bss_stop)); |
| |
| #undef MLK |
| #undef MLM |
| #undef MLK_ROUNDUP |
| |
| /* |
| * Check boundaries twice: Some fundamental inconsistencies can |
| * be detected at build time already. |
| */ |
| #ifdef CONFIG_MMU |
| BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
| BUG_ON(TASK_SIZE > MODULES_VADDR); |
| #endif |
| |
| #ifdef CONFIG_HIGHMEM |
| BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| #endif |
| |
| 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; |
| } |
| } |
| |
| #ifdef CONFIG_STRICT_KERNEL_RWX |
| struct section_perm { |
| const char *name; |
| unsigned long start; |
| unsigned long end; |
| pmdval_t mask; |
| pmdval_t prot; |
| pmdval_t clear; |
| }; |
| |
| /* First section-aligned location at or after __start_rodata. */ |
| extern char __start_rodata_section_aligned[]; |
| |
| static struct section_perm nx_perms[] = { |
| /* Make pages tables, etc before _stext RW (set NX). */ |
| { |
| .name = "pre-text NX", |
| .start = PAGE_OFFSET, |
| .end = (unsigned long)_stext, |
| .mask = ~PMD_SECT_XN, |
| .prot = PMD_SECT_XN, |
| }, |
| /* Make init RW (set NX). */ |
| { |
| .name = "init NX", |
| .start = (unsigned long)__init_begin, |
| .end = (unsigned long)_sdata, |
| .mask = ~PMD_SECT_XN, |
| .prot = PMD_SECT_XN, |
| }, |
| /* Make rodata NX (set RO in ro_perms below). */ |
| { |
| .name = "rodata NX", |
| .start = (unsigned long)__start_rodata_section_aligned, |
| .end = (unsigned long)__init_begin, |
| .mask = ~PMD_SECT_XN, |
| .prot = PMD_SECT_XN, |
| }, |
| }; |
| |
| static struct section_perm ro_perms[] = { |
| /* Make kernel code and rodata RX (set RO). */ |
| { |
| .name = "text/rodata RO", |
| .start = (unsigned long)_stext, |
| .end = (unsigned long)__init_begin, |
| #ifdef CONFIG_ARM_LPAE |
| .mask = ~L_PMD_SECT_RDONLY, |
| .prot = L_PMD_SECT_RDONLY, |
| #else |
| .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), |
| .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, |
| .clear = PMD_SECT_AP_WRITE, |
| #endif |
| }, |
| }; |
| |
| /* |
| * Updates section permissions only for the current mm (sections are |
| * copied into each mm). During startup, this is the init_mm. Is only |
| * safe to be called with preemption disabled, as under stop_machine(). |
| */ |
| static inline void section_update(unsigned long addr, pmdval_t mask, |
| pmdval_t prot, struct mm_struct *mm) |
| { |
| pmd_t *pmd; |
| |
| pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); |
| |
| #ifdef CONFIG_ARM_LPAE |
| pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); |
| #else |
| if (addr & SECTION_SIZE) |
| pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); |
| else |
| pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); |
| #endif |
| flush_pmd_entry(pmd); |
| local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); |
| } |
| |
| /* Make sure extended page tables are in use. */ |
| static inline bool arch_has_strict_perms(void) |
| { |
| if (cpu_architecture() < CPU_ARCH_ARMv6) |
| return false; |
| |
| return !!(get_cr() & CR_XP); |
| } |
| |
| void set_section_perms(struct section_perm *perms, int n, bool set, |
| struct mm_struct *mm) |
| { |
| size_t i; |
| unsigned long addr; |
| |
| if (!arch_has_strict_perms()) |
| return; |
| |
| for (i = 0; i < n; i++) { |
| if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || |
| !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { |
| pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", |
| perms[i].name, perms[i].start, perms[i].end, |
| SECTION_SIZE); |
| continue; |
| } |
| |
| for (addr = perms[i].start; |
| addr < perms[i].end; |
| addr += SECTION_SIZE) |
| section_update(addr, perms[i].mask, |
| set ? perms[i].prot : perms[i].clear, mm); |
| } |
| |
| } |
| |
| static void update_sections_early(struct section_perm perms[], int n) |
| { |
| struct task_struct *t, *s; |
| |
| read_lock(&tasklist_lock); |
| for_each_process(t) { |
| if (t->flags & PF_KTHREAD) |
| continue; |
| for_each_thread(t, s) |
| set_section_perms(perms, n, true, s->mm); |
| } |
| read_unlock(&tasklist_lock); |
| set_section_perms(perms, n, true, current->active_mm); |
| set_section_perms(perms, n, true, &init_mm); |
| } |
| |
| int __fix_kernmem_perms(void *unused) |
| { |
| update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); |
| return 0; |
| } |
| |
| void fix_kernmem_perms(void) |
| { |
| stop_machine(__fix_kernmem_perms, NULL, NULL); |
| } |
| |
| int __mark_rodata_ro(void *unused) |
| { |
| update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); |
| return 0; |
| } |
| |
| void mark_rodata_ro(void) |
| { |
| stop_machine(__mark_rodata_ro, NULL, NULL); |
| } |
| |
| void set_kernel_text_rw(void) |
| { |
| set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, |
| current->active_mm); |
| } |
| |
| void set_kernel_text_ro(void) |
| { |
| set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, |
| current->active_mm); |
| } |
| |
| #else |
| static inline void fix_kernmem_perms(void) { } |
| #endif /* CONFIG_STRICT_KERNEL_RWX */ |
| |
| void free_tcmmem(void) |
| { |
| #ifdef CONFIG_HAVE_TCM |
| extern char __tcm_start, __tcm_end; |
| |
| poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
| free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
| #endif |
| } |
| |
| void free_initmem(void) |
| { |
| fix_kernmem_perms(); |
| free_tcmmem(); |
| |
| poison_init_mem(__init_begin, __init_end - __init_begin); |
| if (!machine_is_integrator() && !machine_is_cintegrator()) |
| free_initmem_default(-1); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| |
| static int keep_initrd; |
| |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| if (!keep_initrd) { |
| if (start == initrd_start) |
| start = round_down(start, PAGE_SIZE); |
| if (end == initrd_end) |
| end = round_up(end, PAGE_SIZE); |
| |
| poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
| free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
| } |
| } |
| |
| static int __init keepinitrd_setup(char *__unused) |
| { |
| keep_initrd = 1; |
| return 1; |
| } |
| |
| __setup("keepinitrd", keepinitrd_setup); |
| #endif |