diff options
Diffstat (limited to 'arch/arm/mm/init.c')
| -rw-r--r-- | arch/arm/mm/init.c | 793 |
1 files changed, 286 insertions, 507 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 15225d829d71..54bdca025c9f 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -1,18 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * 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> @@ -20,45 +18,42 @@ #include <linux/highmem.h> #include <linux/gfp.h> #include <linux/memblock.h> -#include <linux/dma-contiguous.h> +#include <linux/dma-map-ops.h> #include <linux/sizes.h> +#include <linux/stop_machine.h> +#include <linux/swiotlb.h> +#include <linux/execmem.h> +#include <asm/cp15.h> #include <asm/mach-types.h> #include <asm/memblock.h> +#include <asm/page.h> #include <asm/prom.h> #include <asm/sections.h> #include <asm/setup.h> +#include <asm/set_memory.h> +#include <asm/system_info.h> #include <asm/tlb.h> #include <asm/fixmap.h> +#include <asm/ptdump.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> #include "mm.h" -static phys_addr_t phys_initrd_start __initdata = 0; -static unsigned long phys_initrd_size __initdata = 0; - -static int __init early_initrd(char *p) +#ifdef CONFIG_CPU_CP15_MMU +unsigned long __init __clear_cr(unsigned long mask) { - 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; + cr_alignment = cr_alignment & ~mask; + return cr_alignment; } -early_param("initrd", early_initrd); +#endif +#ifdef CONFIG_BLK_DEV_INITRD static int __init parse_tag_initrd(const struct tag *tag) { - printk(KERN_WARNING "ATAG_INITRD is deprecated; " + 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; @@ -75,139 +70,19 @@ static int __init parse_tag_initrd2(const struct tag *tag) } __tagtable(ATAG_INITRD2, parse_tag_initrd2); - -#ifdef CONFIG_OF_FLATTREE -void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) -{ - phys_initrd_start = start; - phys_initrd_size = end - start; -} -#endif /* CONFIG_OF_FLATTREE */ - -/* - * This keeps memory configuration data used by a couple memory - * initialization functions, as well as show_mem() for the skipping - * of holes in the memory map. It is populated by arm_add_memory(). - */ -struct meminfo meminfo; - -void show_mem(unsigned int filter) -{ - int free = 0, total = 0, reserved = 0; - int shared = 0, cached = 0, slab = 0, i; - struct meminfo * mi = &meminfo; - - printk("Mem-info:\n"); - show_free_areas(filter); - - if (filter & SHOW_MEM_FILTER_PAGE_COUNT) - return; - - for_each_bank (i, mi) { - struct membank *bank = &mi->bank[i]; - unsigned int pfn1, pfn2; - struct page *page, *end; - - pfn1 = bank_pfn_start(bank); - pfn2 = bank_pfn_end(bank); - - page = pfn_to_page(pfn1); - end = pfn_to_page(pfn2 - 1) + 1; - - do { - total++; - if (PageReserved(page)) - reserved++; - else if (PageSwapCache(page)) - cached++; - else if (PageSlab(page)) - slab++; - else if (!page_count(page)) - free++; - else - shared += page_count(page) - 1; - page++; - } while (page < end); - } - - printk("%d pages of RAM\n", total); - printk("%d free pages\n", free); - printk("%d reserved pages\n", reserved); - printk("%d slab pages\n", slab); - printk("%d pages shared\n", shared); - printk("%d pages swap cached\n", cached); -} +#endif static void __init find_limits(unsigned long *min, unsigned long *max_low, unsigned long *max_high) { - struct meminfo *mi = &meminfo; - int i; - - /* This assumes the meminfo array is properly sorted */ - *min = bank_pfn_start(&mi->bank[0]); - for_each_bank (i, mi) - if (mi->bank[i].highmem) - break; - *max_low = bank_pfn_end(&mi->bank[i - 1]); - *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); -} - -static void __init arm_bootmem_init(unsigned long start_pfn, - unsigned long end_pfn) -{ - struct memblock_region *reg; - unsigned int boot_pages; - phys_addr_t bitmap; - pg_data_t *pgdat; - - /* - * Allocate the bootmem bitmap page. This must be in a region - * of memory which has already been mapped. - */ - boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); - bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, - __pfn_to_phys(end_pfn)); - - /* - * Initialise the bootmem allocator, handing the - * memory banks over to bootmem. - */ - node_set_online(0); - pgdat = NODE_DATA(0); - init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); - - /* Free the lowmem regions from memblock into bootmem. */ - for_each_memblock(memory, reg) { - unsigned long start = memblock_region_memory_base_pfn(reg); - unsigned long end = memblock_region_memory_end_pfn(reg); - - if (end >= end_pfn) - end = end_pfn; - if (start >= end) - break; - - free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); - } - - /* Reserve the lowmem memblock reserved regions in bootmem. */ - for_each_memblock(reserved, reg) { - unsigned long start = memblock_region_reserved_base_pfn(reg); - unsigned long end = memblock_region_reserved_end_pfn(reg); - - if (end >= end_pfn) - end = end_pfn; - if (start >= end) - break; - - reserve_bootmem(__pfn_to_phys(start), - (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); - } + *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 -unsigned long arm_dma_zone_size __read_mostly; +phys_addr_t arm_dma_zone_size __read_mostly; EXPORT_SYMBOL(arm_dma_zone_size); /* @@ -217,21 +92,10 @@ EXPORT_SYMBOL(arm_dma_zone_size); * so a successful GFP_DMA allocation will always satisfy this. */ phys_addr_t arm_dma_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; -} +unsigned long arm_dma_pfn_limit; #endif -void __init setup_dma_zone(struct machine_desc *mdesc) +void __init setup_dma_zone(const struct machine_desc *mdesc) { #ifdef CONFIG_ZONE_DMA if (mdesc->dma_zone_size) { @@ -239,85 +103,47 @@ void __init setup_dma_zone(struct machine_desc *mdesc) 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 arm_bootmem_free(unsigned long min, unsigned long max_low, +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)); + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; - /* - * 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; +#ifdef CONFIG_ZONE_DMA + max_zone_pfn[ZONE_DMA] = min(arm_dma_pfn_limit, 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; - } + max_zone_pfn[ZONE_NORMAL] = max_low; #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); + max_zone_pfn[ZONE_HIGHMEM] = max_high; #endif - - free_area_init_node(0, zone_size, min, zhole_size); + free_area_init(max_zone_pfn); } #ifdef CONFIG_HAVE_ARCH_PFN_VALID int pfn_valid(unsigned long pfn) { - return memblock_is_memory(__pfn_to_phys(pfn)); -} -EXPORT_SYMBOL(pfn_valid); -#endif + phys_addr_t addr = __pfn_to_phys(pfn); + unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages; -#ifndef CONFIG_SPARSEMEM -static void __init arm_memory_present(void) -{ -} -#else -static void __init arm_memory_present(void) -{ - struct memblock_region *reg; + if (__phys_to_pfn(addr) != pfn) + return 0; + + /* + * If address less than pageblock_size bytes away from a present + * memory chunk there still will be a memory map entry for it + * because we round freed memory map to the pageblock boundaries. + */ + if (memblock_overlaps_region(&memblock.memory, + ALIGN_DOWN(addr, pageblock_size), + pageblock_size)) + return 1; - for_each_memblock(memory, reg) - memory_present(0, memblock_region_memory_base_pfn(reg), - memblock_region_memory_end_pfn(reg)); + return 0; } +EXPORT_SYMBOL(pfn_valid); #endif static bool arm_memblock_steal_permitted = true; @@ -328,104 +154,76 @@ phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) BUG_ON(!arm_memblock_steal_permitted); - phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); - memblock_free(phys, size); + phys = memblock_phys_alloc(size, align); + if (!phys) + panic("Failed to steal %pa bytes at %pS\n", + &size, (void *)_RET_IP_); + + memblock_phys_free(phys, size); memblock_remove(phys, size); return phys; } -void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) +#ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND +void check_cpu_icache_size(int cpuid) { - int i; + u32 size, ctr; - for (i = 0; i < mi->nr_banks; i++) - memblock_add(mi->bank[i].start, mi->bank[i].size); + asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr)); - /* Register the kernel text, kernel data and initrd with memblock. */ -#ifdef CONFIG_XIP_KERNEL - memblock_reserve(__pa(_sdata), _end - _sdata); -#else - memblock_reserve(__pa(_stext), _end - _stext); + size = 1 << ((ctr & 0xf) + 2); + if (cpuid != 0 && icache_size != size) + pr_info("CPU%u: detected I-Cache line size mismatch, workaround enabled\n", + cpuid); + if (icache_size > size) + icache_size = size; +} #endif -#ifdef CONFIG_BLK_DEV_INITRD - if (phys_initrd_size && - !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { - pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", - (u64)phys_initrd_start, phys_initrd_size); - phys_initrd_start = phys_initrd_size = 0; - } - if (phys_initrd_size && - memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { - pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", - (u64)phys_initrd_start, phys_initrd_size); - phys_initrd_start = phys_initrd_size = 0; - } - 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 +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); + + reserve_initrd_mem(); arm_mm_memblock_reserve(); - arm_dt_memblock_reserve(); /* reserve any platform specific memblock areas */ if (mdesc->reserve) mdesc->reserve(); - /* - * reserve memory for DMA contigouos allocations, - * must come from DMA area inside low memory - */ - dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); + early_init_fdt_scan_reserved_mem(); + + /* reserve memory for DMA contiguous allocations */ + dma_contiguous_reserve(arm_dma_limit); arm_memblock_steal_permitted = false; - memblock_allow_resize(); memblock_dump_all(); } void __init bootmem_init(void) { - unsigned long min, max_low, max_high; - - max_low = max_high = 0; - - find_limits(&min, &max_low, &max_high); + memblock_allow_resize(); - arm_bootmem_init(min, max_low); + find_limits(&min_low_pfn, &max_low_pfn, &max_pfn); - /* - * Sparsemem tries to allocate bootmem in memory_present(), - * so must be done after the fixed reservations - */ - arm_memory_present(); + early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT, + (phys_addr_t)max_low_pfn << PAGE_SHIFT); /* - * sparse_init() needs the bootmem allocator up and running. + * sparse_init() tries to allocate memory from memblock, so must be + * done after the fixed reservations */ sparse_init(); /* - * Now free the memory - free_area_init_node needs + * Now free the memory - free_area_init needs * the sparse mem_map arrays initialized by sparse_init() * for memmap_init_zone(), otherwise all PFNs are invalid. */ - arm_bootmem_free(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. - * - * Note: max_low_pfn and max_pfn reflect the number of _pages_ in - * the system, not the maximum PFN. - */ - max_low_pfn = max_low - PHYS_PFN_OFFSET; - max_pfn = max_high - PHYS_PFN_OFFSET; + zone_sizes_init(min_low_pfn, max_low_pfn, max_pfn); } /* @@ -439,254 +237,199 @@ static inline void poison_init_mem(void *s, size_t count) *p++ = 0xe7fddef0; } -static inline void -free_memmap(unsigned long start_pfn, unsigned long end_pfn) +void __init arch_mm_preinit(void) { - struct page *start_pg, *end_pg; - phys_addr_t pg, pgend; +#ifdef CONFIG_ARM_LPAE + swiotlb_init(max_pfn > arm_dma_pfn_limit, SWIOTLB_VERBOSE); +#endif - /* - * 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; +#ifdef CONFIG_SA1111 + /* now that our DMA memory is actually so designated, we can free it */ + memblock_phys_free(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET); +#endif /* - * Convert to physical addresses, and - * round start upwards and end downwards. + * Check boundaries twice: Some fundamental inconsistencies can + * be detected at build time already. */ - pg = PAGE_ALIGN(__pa(start_pg)); - pgend = __pa(end_pg) & PAGE_MASK; +#ifdef CONFIG_MMU + BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); + BUG_ON(TASK_SIZE > MODULES_VADDR); +#endif - /* - * If there are free pages between these, - * free the section of the memmap array. - */ - if (pg < pgend) - free_bootmem(pg, pgend - pg); +#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 } +#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 | PMD_SECT_AP2), + .prot = L_PMD_SECT_RDONLY | PMD_SECT_AP2, +#else + .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), + .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, + .clear = PMD_SECT_AP_WRITE, +#endif + }, +}; + /* - * The mem_map array can get very big. Free the unused area of the memory map. + * 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 void __init free_unused_memmap(struct meminfo *mi) +static inline void section_update(unsigned long addr, pmdval_t mask, + pmdval_t prot, struct mm_struct *mm) { - unsigned long bank_start, prev_bank_end = 0; - unsigned int i; + pmd_t *pmd; - /* - * This relies on each bank being in address order. - * The banks are sorted previously in bootmem_init(). - */ - for_each_bank(i, mi) { - struct membank *bank = &mi->bank[i]; - - bank_start = bank_pfn_start(bank); - -#ifdef CONFIG_SPARSEMEM - /* - * Take care not to free memmap entries that don't exist - * due to SPARSEMEM sections which aren't present. - */ - bank_start = min(bank_start, - ALIGN(prev_bank_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. - */ - bank_start = round_down(bank_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_bank_end && prev_bank_end < bank_start) - free_memmap(prev_bank_end, bank_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_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); - } + pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, addr), addr), addr), addr); -#ifdef CONFIG_SPARSEMEM - if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) - free_memmap(prev_bank_end, - ALIGN(prev_bank_end, PAGES_PER_SECTION)); +#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); } -#ifdef CONFIG_HIGHMEM -static inline void free_area_high(unsigned long pfn, unsigned long end) +/* Make sure extended page tables are in use. */ +static inline bool arch_has_strict_perms(void) { - for (; pfn < end; pfn++) - free_highmem_page(pfn_to_page(pfn)); + if (cpu_architecture() < CPU_ARCH_ARMv6) + return false; + + return !!(get_cr() & CR_XP); } -#endif -static void __init free_highpages(void) +static void set_section_perms(struct section_perm *perms, int n, bool set, + struct mm_struct *mm) { -#ifdef CONFIG_HIGHMEM - unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; - struct memblock_region *mem, *res; + size_t i; + unsigned long addr; - /* 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); + if (!arch_has_strict_perms()) + return; - /* Ignore complete lowmem entries */ - if (end <= max_low) + 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; - - /* 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); + 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); } -#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. + * update_sections_early intended to be called only through stop_machine + * framework and executed by only one CPU while all other CPUs will spin and + * wait, so no locking is required in this function. */ -void __init mem_init(void) +static void update_sections_early(struct section_perm perms[], int n) { -#ifdef CONFIG_HAVE_TCM - /* These pointers are filled in on TCM detection */ - extern u32 dtcm_end; - extern u32 itcm_end; -#endif - - max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; - - /* this will put all unused low memory onto the freelists */ - free_unused_memmap(&meminfo); - free_all_bootmem(); + struct task_struct *t, *s; -#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) - - printk(KERN_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" " (%4d kB)\n" - " .init : 0x%p" " - 0x%p" " (%4d kB)\n" - " .data : 0x%p" " - 0x%p" " (%4d kB)\n" - " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", - - MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_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_TOP), - 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)); + for_each_process(t) { + if (t->flags & PF_KTHREAD) + continue; + for_each_thread(t, s) + if (s->mm) + set_section_perms(perms, n, true, s->mm); + } + set_section_perms(perms, n, true, current->active_mm); + set_section_perms(perms, n, true, &init_mm); +} -#undef MLK -#undef MLM -#undef MLK_ROUNDUP +static int __fix_kernmem_perms(void *unused) +{ + update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); + return 0; +} - /* - * 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 +static void fix_kernmem_perms(void) +{ + stop_machine(__fix_kernmem_perms, NULL, NULL); +} -#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 +static int __mark_rodata_ro(void *unused) +{ + update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); + return 0; +} - 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 mark_rodata_ro(void) +{ + stop_machine(__mark_rodata_ro, NULL, NULL); + arm_debug_checkwx(); } +#else +static inline void fix_kernmem_perms(void) { } +#endif /* CONFIG_STRICT_KERNEL_RWX */ + void free_initmem(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 + fix_kernmem_perms(); poison_init_mem(__init_begin, __init_end - __init_begin); if (!machine_is_integrator() && !machine_is_cintegrator()) @@ -694,22 +437,58 @@ void free_initmem(void) } #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); - free_reserved_area((void *)start, (void *)end, -1, "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"); } +#endif -static int __init keepinitrd_setup(char *__unused) +#ifdef CONFIG_EXECMEM + +#ifdef CONFIG_XIP_KERNEL +/* + * The XIP kernel text is mapped in the module area for modules and + * some other stuff to work without any indirect relocations. + * MODULES_VADDR is redefined here and not in asm/memory.h to avoid + * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. + */ +#undef MODULES_VADDR +#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK) +#endif + +#ifdef CONFIG_MMU +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - keep_initrd = 1; - return 1; + unsigned long fallback_start = 0, fallback_end = 0; + + if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) { + fallback_start = VMALLOC_START; + fallback_end = VMALLOC_END; + } + + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL_EXEC, + .alignment = 1, + .fallback_start = fallback_start, + .fallback_end = fallback_end, + }, + }, + }; + + return &execmem_info; } +#endif /* CONFIG_MMU */ -__setup("keepinitrd", keepinitrd_setup); -#endif +#endif /* CONFIG_EXECMEM */ |