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e46e45f00d
Covert to the generic reserve_initrd_mem() function. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
492 lines
12 KiB
C
492 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/mman.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task.h>
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#include <linux/export.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/dma-map-ops.h>
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#include <linux/sizes.h>
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#include <linux/stop_machine.h>
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#include <linux/swiotlb.h>
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#include <asm/cp15.h>
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#include <asm/mach-types.h>
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#include <asm/memblock.h>
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#include <asm/memory.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/set_memory.h>
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#include <asm/system_info.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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#include <asm/ptdump.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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#ifdef CONFIG_CPU_CP15_MMU
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unsigned long __init __clear_cr(unsigned long mask)
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{
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cr_alignment = cr_alignment & ~mask;
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return cr_alignment;
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}
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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static int __init parse_tag_initrd(const struct tag *tag)
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{
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pr_warn("ATAG_INITRD is deprecated; "
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"please update your bootloader.\n");
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phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD, parse_tag_initrd);
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static int __init parse_tag_initrd2(const struct tag *tag)
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{
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phys_initrd_start = tag->u.initrd.start;
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD2, parse_tag_initrd2);
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#endif
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static void __init find_limits(unsigned long *min, unsigned long *max_low,
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unsigned long *max_high)
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{
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*max_low = PFN_DOWN(memblock_get_current_limit());
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*min = PFN_UP(memblock_start_of_DRAM());
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*max_high = PFN_DOWN(memblock_end_of_DRAM());
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}
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#ifdef CONFIG_ZONE_DMA
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phys_addr_t arm_dma_zone_size __read_mostly;
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EXPORT_SYMBOL(arm_dma_zone_size);
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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phys_addr_t arm_dma_limit;
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unsigned long arm_dma_pfn_limit;
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#endif
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void __init setup_dma_zone(const struct machine_desc *mdesc)
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{
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#ifdef CONFIG_ZONE_DMA
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if (mdesc->dma_zone_size) {
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arm_dma_zone_size = mdesc->dma_zone_size;
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arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
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} else
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arm_dma_limit = 0xffffffff;
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arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
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#endif
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}
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static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
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unsigned long max_high)
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{
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfn[ZONE_DMA] = min(arm_dma_pfn_limit, max_low);
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#endif
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max_zone_pfn[ZONE_NORMAL] = max_low;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfn[ZONE_HIGHMEM] = max_high;
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#endif
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free_area_init(max_zone_pfn);
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}
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#ifdef CONFIG_HAVE_ARCH_PFN_VALID
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int pfn_valid(unsigned long pfn)
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{
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phys_addr_t addr = __pfn_to_phys(pfn);
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unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages;
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if (__phys_to_pfn(addr) != pfn)
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return 0;
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/*
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* If address less than pageblock_size bytes away from a present
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* memory chunk there still will be a memory map entry for it
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* because we round freed memory map to the pageblock boundaries.
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*/
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if (memblock_overlaps_region(&memblock.memory,
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ALIGN_DOWN(addr, pageblock_size),
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pageblock_size))
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return 1;
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return 0;
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}
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EXPORT_SYMBOL(pfn_valid);
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#endif
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static bool arm_memblock_steal_permitted = true;
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phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
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{
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phys_addr_t phys;
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BUG_ON(!arm_memblock_steal_permitted);
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phys = memblock_phys_alloc(size, align);
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if (!phys)
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panic("Failed to steal %pa bytes at %pS\n",
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&size, (void *)_RET_IP_);
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memblock_phys_free(phys, size);
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memblock_remove(phys, size);
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return phys;
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}
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#ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
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void check_cpu_icache_size(int cpuid)
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{
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u32 size, ctr;
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asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
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size = 1 << ((ctr & 0xf) + 2);
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if (cpuid != 0 && icache_size != size)
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pr_info("CPU%u: detected I-Cache line size mismatch, workaround enabled\n",
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cpuid);
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if (icache_size > size)
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icache_size = size;
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}
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#endif
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void __init arm_memblock_init(const struct machine_desc *mdesc)
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{
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/* Register the kernel text, kernel data and initrd with memblock. */
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memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START);
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reserve_initrd_mem();
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arm_mm_memblock_reserve();
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/* reserve any platform specific memblock areas */
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if (mdesc->reserve)
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mdesc->reserve();
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early_init_fdt_scan_reserved_mem();
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/* reserve memory for DMA contiguous allocations */
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dma_contiguous_reserve(arm_dma_limit);
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arm_memblock_steal_permitted = false;
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memblock_dump_all();
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}
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void __init bootmem_init(void)
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{
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memblock_allow_resize();
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find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
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early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT,
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(phys_addr_t)max_low_pfn << PAGE_SHIFT);
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/*
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* sparse_init() tries to allocate memory from memblock, so must be
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* done after the fixed reservations
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*/
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sparse_init();
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/*
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* Now free the memory - free_area_init needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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zone_sizes_init(min_low_pfn, max_low_pfn, max_pfn);
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}
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/*
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* Poison init memory with an undefined instruction (ARM) or a branch to an
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* undefined instruction (Thumb).
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*/
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static inline void poison_init_mem(void *s, size_t count)
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{
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u32 *p = (u32 *)s;
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for (; count != 0; count -= 4)
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*p++ = 0xe7fddef0;
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}
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static void __init free_highpages(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long max_low = max_low_pfn;
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phys_addr_t range_start, range_end;
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u64 i;
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/* set highmem page free */
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for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
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&range_start, &range_end, NULL) {
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unsigned long start = PFN_UP(range_start);
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unsigned long end = PFN_DOWN(range_end);
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/* Ignore complete lowmem entries */
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if (end <= max_low)
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continue;
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/* Truncate partial highmem entries */
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if (start < max_low)
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start = max_low;
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for (; start < end; start++)
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free_highmem_page(pfn_to_page(start));
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}
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#endif
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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#ifdef CONFIG_ARM_LPAE
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if (swiotlb_force == SWIOTLB_FORCE ||
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max_pfn > arm_dma_pfn_limit)
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swiotlb_init(1);
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else
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swiotlb_force = SWIOTLB_NO_FORCE;
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#endif
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set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
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/* this will put all unused low memory onto the freelists */
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memblock_free_all();
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#ifdef CONFIG_SA1111
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/* now that our DMA memory is actually so designated, we can free it */
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free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
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#endif
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free_highpages();
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/*
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* Check boundaries twice: Some fundamental inconsistencies can
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* be detected at build time already.
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*/
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#ifdef CONFIG_MMU
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BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
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BUG_ON(TASK_SIZE > MODULES_VADDR);
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#endif
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#ifdef CONFIG_HIGHMEM
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BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
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BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
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#endif
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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struct section_perm {
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const char *name;
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unsigned long start;
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unsigned long end;
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pmdval_t mask;
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pmdval_t prot;
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pmdval_t clear;
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};
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/* First section-aligned location at or after __start_rodata. */
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extern char __start_rodata_section_aligned[];
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static struct section_perm nx_perms[] = {
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/* Make pages tables, etc before _stext RW (set NX). */
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{
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.name = "pre-text NX",
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.start = PAGE_OFFSET,
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.end = (unsigned long)_stext,
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.mask = ~PMD_SECT_XN,
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.prot = PMD_SECT_XN,
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},
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/* Make init RW (set NX). */
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{
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.name = "init NX",
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.start = (unsigned long)__init_begin,
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.end = (unsigned long)_sdata,
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.mask = ~PMD_SECT_XN,
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.prot = PMD_SECT_XN,
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},
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/* Make rodata NX (set RO in ro_perms below). */
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{
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.name = "rodata NX",
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.start = (unsigned long)__start_rodata_section_aligned,
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.end = (unsigned long)__init_begin,
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.mask = ~PMD_SECT_XN,
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.prot = PMD_SECT_XN,
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},
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};
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static struct section_perm ro_perms[] = {
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/* Make kernel code and rodata RX (set RO). */
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{
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.name = "text/rodata RO",
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.start = (unsigned long)_stext,
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.end = (unsigned long)__init_begin,
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#ifdef CONFIG_ARM_LPAE
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.mask = ~(L_PMD_SECT_RDONLY | PMD_SECT_AP2),
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.prot = L_PMD_SECT_RDONLY | PMD_SECT_AP2,
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#else
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.mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE),
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.prot = PMD_SECT_APX | PMD_SECT_AP_WRITE,
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.clear = PMD_SECT_AP_WRITE,
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#endif
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},
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};
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/*
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* Updates section permissions only for the current mm (sections are
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* copied into each mm). During startup, this is the init_mm. Is only
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* safe to be called with preemption disabled, as under stop_machine().
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*/
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static inline void section_update(unsigned long addr, pmdval_t mask,
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pmdval_t prot, struct mm_struct *mm)
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{
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pmd_t *pmd;
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pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, addr), addr), addr), addr);
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#ifdef CONFIG_ARM_LPAE
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pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
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#else
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if (addr & SECTION_SIZE)
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pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot);
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else
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pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
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#endif
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flush_pmd_entry(pmd);
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local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE);
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}
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/* Make sure extended page tables are in use. */
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static inline bool arch_has_strict_perms(void)
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{
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if (cpu_architecture() < CPU_ARCH_ARMv6)
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return false;
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return !!(get_cr() & CR_XP);
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}
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static void set_section_perms(struct section_perm *perms, int n, bool set,
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struct mm_struct *mm)
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{
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size_t i;
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unsigned long addr;
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if (!arch_has_strict_perms())
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return;
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for (i = 0; i < n; i++) {
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if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) ||
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!IS_ALIGNED(perms[i].end, SECTION_SIZE)) {
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pr_err("BUG: %s section %lx-%lx not aligned to %lx\n",
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perms[i].name, perms[i].start, perms[i].end,
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SECTION_SIZE);
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continue;
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}
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for (addr = perms[i].start;
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addr < perms[i].end;
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addr += SECTION_SIZE)
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section_update(addr, perms[i].mask,
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set ? perms[i].prot : perms[i].clear, mm);
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}
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}
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/**
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* update_sections_early intended to be called only through stop_machine
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* framework and executed by only one CPU while all other CPUs will spin and
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* wait, so no locking is required in this function.
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*/
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static void update_sections_early(struct section_perm perms[], int n)
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{
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struct task_struct *t, *s;
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for_each_process(t) {
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if (t->flags & PF_KTHREAD)
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continue;
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for_each_thread(t, s)
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if (s->mm)
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set_section_perms(perms, n, true, s->mm);
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}
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set_section_perms(perms, n, true, current->active_mm);
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set_section_perms(perms, n, true, &init_mm);
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}
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static int __fix_kernmem_perms(void *unused)
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{
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update_sections_early(nx_perms, ARRAY_SIZE(nx_perms));
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return 0;
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}
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static void fix_kernmem_perms(void)
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{
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stop_machine(__fix_kernmem_perms, NULL, NULL);
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}
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static int __mark_rodata_ro(void *unused)
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{
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update_sections_early(ro_perms, ARRAY_SIZE(ro_perms));
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return 0;
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}
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void mark_rodata_ro(void)
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{
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stop_machine(__mark_rodata_ro, NULL, NULL);
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debug_checkwx();
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}
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#else
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static inline void fix_kernmem_perms(void) { }
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#endif /* CONFIG_STRICT_KERNEL_RWX */
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void free_initmem(void)
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{
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fix_kernmem_perms();
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poison_init_mem(__init_begin, __init_end - __init_begin);
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if (!machine_is_integrator() && !machine_is_cintegrator())
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free_initmem_default(-1);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start == initrd_start)
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start = round_down(start, PAGE_SIZE);
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if (end == initrd_end)
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end = round_up(end, PAGE_SIZE);
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poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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#endif
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