1051 lines
30 KiB
C
1051 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2019 Western Digital Corporation or its affiliates.
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* Copyright (C) 2020 FORTH-ICS/CARV
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* Nick Kossifidis <mick@ics.forth.gr>
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/initrd.h>
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#include <linux/swap.h>
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#include <linux/swiotlb.h>
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#include <linux/sizes.h>
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#include <linux/of_fdt.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/libfdt.h>
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#include <linux/set_memory.h>
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#include <linux/dma-map-ops.h>
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#include <linux/crash_dump.h>
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#include <linux/hugetlb.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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#include <asm/soc.h>
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#include <asm/io.h>
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#include <asm/ptdump.h>
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#include <asm/numa.h>
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#include "../kernel/head.h"
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struct kernel_mapping kernel_map __ro_after_init;
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EXPORT_SYMBOL(kernel_map);
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#ifdef CONFIG_XIP_KERNEL
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#define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
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#endif
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#ifdef CONFIG_64BIT
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u64 satp_mode = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_48 : SATP_MODE_39;
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#else
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u64 satp_mode = SATP_MODE_32;
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#endif
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EXPORT_SYMBOL(satp_mode);
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bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
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EXPORT_SYMBOL(pgtable_l4_enabled);
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phys_addr_t phys_ram_base __ro_after_init;
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EXPORT_SYMBOL(phys_ram_base);
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
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__page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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extern char _start[];
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#define DTB_EARLY_BASE_VA PGDIR_SIZE
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void *_dtb_early_va __initdata;
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uintptr_t _dtb_early_pa __initdata;
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static phys_addr_t dma32_phys_limit __initdata;
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static void __init zone_sizes_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init(max_zone_pfns);
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}
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#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
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static inline void print_mlk(char *name, unsigned long b, unsigned long t)
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{
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pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
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(((t) - (b)) >> 10));
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}
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static inline void print_mlm(char *name, unsigned long b, unsigned long t)
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{
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pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
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(((t) - (b)) >> 20));
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}
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static void __init print_vm_layout(void)
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{
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pr_notice("Virtual kernel memory layout:\n");
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print_mlk("fixmap", (unsigned long)FIXADDR_START,
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(unsigned long)FIXADDR_TOP);
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print_mlm("pci io", (unsigned long)PCI_IO_START,
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(unsigned long)PCI_IO_END);
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print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
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(unsigned long)VMEMMAP_END);
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print_mlm("vmalloc", (unsigned long)VMALLOC_START,
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(unsigned long)VMALLOC_END);
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print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
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(unsigned long)high_memory);
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if (IS_ENABLED(CONFIG_64BIT)) {
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#ifdef CONFIG_KASAN
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print_mlm("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
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#endif
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print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
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(unsigned long)ADDRESS_SPACE_END);
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}
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}
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#else
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static void print_vm_layout(void) { }
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#endif /* CONFIG_DEBUG_VM */
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void __init mem_init(void)
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{
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#ifdef CONFIG_FLATMEM
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BUG_ON(!mem_map);
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#endif /* CONFIG_FLATMEM */
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#ifdef CONFIG_SWIOTLB
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if (swiotlb_force == SWIOTLB_FORCE ||
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max_pfn > PFN_DOWN(dma32_phys_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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high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
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memblock_free_all();
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print_vm_layout();
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}
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/* Limit the memory size via mem. */
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static phys_addr_t memory_limit;
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static int __init early_mem(char *p)
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{
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u64 size;
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if (!p)
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return 1;
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size = memparse(p, &p) & PAGE_MASK;
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memory_limit = min_t(u64, size, memory_limit);
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pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
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return 0;
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}
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early_param("mem", early_mem);
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static void __init setup_bootmem(void)
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{
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phys_addr_t vmlinux_end = __pa_symbol(&_end);
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phys_addr_t max_mapped_addr;
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phys_addr_t phys_ram_end, vmlinux_start;
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if (IS_ENABLED(CONFIG_XIP_KERNEL))
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vmlinux_start = __pa_symbol(&_sdata);
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else
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vmlinux_start = __pa_symbol(&_start);
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memblock_enforce_memory_limit(memory_limit);
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/*
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* Make sure we align the reservation on PMD_SIZE since we will
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* map the kernel in the linear mapping as read-only: we do not want
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* any allocation to happen between _end and the next pmd aligned page.
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*/
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if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
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vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
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/*
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* Reserve from the start of the kernel to the end of the kernel
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*/
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memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
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phys_ram_end = memblock_end_of_DRAM();
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if (!IS_ENABLED(CONFIG_XIP_KERNEL))
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phys_ram_base = memblock_start_of_DRAM();
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/*
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* memblock allocator is not aware of the fact that last 4K bytes of
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* the addressable memory can not be mapped because of IS_ERR_VALUE
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* macro. Make sure that last 4k bytes are not usable by memblock
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* if end of dram is equal to maximum addressable memory. For 64-bit
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* kernel, this problem can't happen here as the end of the virtual
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* address space is occupied by the kernel mapping then this check must
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* be done as soon as the kernel mapping base address is determined.
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*/
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if (!IS_ENABLED(CONFIG_64BIT)) {
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max_mapped_addr = __pa(~(ulong)0);
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if (max_mapped_addr == (phys_ram_end - 1))
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memblock_set_current_limit(max_mapped_addr - 4096);
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}
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min_low_pfn = PFN_UP(phys_ram_base);
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max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
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dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
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set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
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reserve_initrd_mem();
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/*
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* If DTB is built in, no need to reserve its memblock.
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* Otherwise, do reserve it but avoid using
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* early_init_fdt_reserve_self() since __pa() does
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* not work for DTB pointers that are fixmap addresses
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*/
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if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
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memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
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early_init_fdt_scan_reserved_mem();
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dma_contiguous_reserve(dma32_phys_limit);
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if (IS_ENABLED(CONFIG_64BIT))
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hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
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memblock_allow_resize();
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}
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#ifdef CONFIG_MMU
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struct pt_alloc_ops pt_ops __initdata;
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unsigned long riscv_pfn_base __ro_after_init;
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EXPORT_SYMBOL(riscv_pfn_base);
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
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pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
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static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
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#ifdef CONFIG_XIP_KERNEL
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#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
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#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
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#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
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#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
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#endif /* CONFIG_XIP_KERNEL */
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void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
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{
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unsigned long addr = __fix_to_virt(idx);
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pte_t *ptep;
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BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
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ptep = &fixmap_pte[pte_index(addr)];
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if (pgprot_val(prot))
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set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
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else
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pte_clear(&init_mm, addr, ptep);
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local_flush_tlb_page(addr);
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}
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static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
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{
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return (pte_t *)((uintptr_t)pa);
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}
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static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
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{
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clear_fixmap(FIX_PTE);
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return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
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}
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static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
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{
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return (pte_t *) __va(pa);
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}
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static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
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{
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/*
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* We only create PMD or PGD early mappings so we
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* should never reach here with MMU disabled.
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*/
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BUG();
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}
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static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
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{
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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}
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static phys_addr_t __init alloc_pte_late(uintptr_t va)
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{
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unsigned long vaddr;
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vaddr = __get_free_page(GFP_KERNEL);
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BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
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return __pa(vaddr);
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}
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static void __init create_pte_mapping(pte_t *ptep,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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uintptr_t pte_idx = pte_index(va);
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BUG_ON(sz != PAGE_SIZE);
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if (pte_none(ptep[pte_idx]))
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ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
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static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
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static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
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#ifdef CONFIG_XIP_KERNEL
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#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
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#define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
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#define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
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#endif /* CONFIG_XIP_KERNEL */
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static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
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static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
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static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
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#ifdef CONFIG_XIP_KERNEL
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#define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
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#define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
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#define early_pud ((pud_t *)XIP_FIXUP(early_pud))
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#endif /* CONFIG_XIP_KERNEL */
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static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
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{
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/* Before MMU is enabled */
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return (pmd_t *)((uintptr_t)pa);
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}
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static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
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{
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clear_fixmap(FIX_PMD);
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return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
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}
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static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
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{
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return (pmd_t *) __va(pa);
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}
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static phys_addr_t __init alloc_pmd_early(uintptr_t va)
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{
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BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
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return (uintptr_t)early_pmd;
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}
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static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
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{
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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}
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static phys_addr_t __init alloc_pmd_late(uintptr_t va)
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{
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unsigned long vaddr;
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vaddr = __get_free_page(GFP_KERNEL);
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BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
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return __pa(vaddr);
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}
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static void __init create_pmd_mapping(pmd_t *pmdp,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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pte_t *ptep;
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phys_addr_t pte_phys;
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uintptr_t pmd_idx = pmd_index(va);
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if (sz == PMD_SIZE) {
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if (pmd_none(pmdp[pmd_idx]))
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pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
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return;
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}
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if (pmd_none(pmdp[pmd_idx])) {
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pte_phys = pt_ops.alloc_pte(va);
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pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
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ptep = pt_ops.get_pte_virt(pte_phys);
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memset(ptep, 0, PAGE_SIZE);
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} else {
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pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
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ptep = pt_ops.get_pte_virt(pte_phys);
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}
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create_pte_mapping(ptep, va, pa, sz, prot);
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}
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static pud_t *__init get_pud_virt_early(phys_addr_t pa)
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{
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return (pud_t *)((uintptr_t)pa);
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}
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static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
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{
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clear_fixmap(FIX_PUD);
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return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
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}
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static pud_t *__init get_pud_virt_late(phys_addr_t pa)
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{
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return (pud_t *)__va(pa);
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}
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static phys_addr_t __init alloc_pud_early(uintptr_t va)
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{
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/* Only one PUD is available for early mapping */
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BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
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return (uintptr_t)early_pud;
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}
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static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
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{
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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}
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static phys_addr_t alloc_pud_late(uintptr_t va)
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{
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unsigned long vaddr;
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vaddr = __get_free_page(GFP_KERNEL);
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BUG_ON(!vaddr);
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return __pa(vaddr);
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}
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static void __init create_pud_mapping(pud_t *pudp,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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pmd_t *nextp;
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phys_addr_t next_phys;
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uintptr_t pud_index = pud_index(va);
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if (sz == PUD_SIZE) {
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if (pud_val(pudp[pud_index]) == 0)
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pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
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return;
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}
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if (pud_val(pudp[pud_index]) == 0) {
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next_phys = pt_ops.alloc_pmd(va);
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pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
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nextp = pt_ops.get_pmd_virt(next_phys);
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memset(nextp, 0, PAGE_SIZE);
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} else {
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next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
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nextp = pt_ops.get_pmd_virt(next_phys);
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}
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create_pmd_mapping(nextp, va, pa, sz, prot);
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}
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#define pgd_next_t pud_t
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#define alloc_pgd_next(__va) (pgtable_l4_enabled ? \
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pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))
|
|
#define get_pgd_next_virt(__pa) (pgtable_l4_enabled ? \
|
|
pt_ops.get_pud_virt(__pa) : (pgd_next_t *)pt_ops.get_pmd_virt(__pa))
|
|
#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
|
|
(pgtable_l4_enabled ? \
|
|
create_pud_mapping(__nextp, __va, __pa, __sz, __prot) : \
|
|
create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))
|
|
#define fixmap_pgd_next (pgtable_l4_enabled ? \
|
|
(uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)
|
|
#define trampoline_pgd_next (pgtable_l4_enabled ? \
|
|
(uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)
|
|
#define early_dtb_pgd_next (pgtable_l4_enabled ? \
|
|
(uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd)
|
|
#else
|
|
#define pgd_next_t pte_t
|
|
#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
|
|
#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
|
|
#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
|
|
create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
|
|
#define fixmap_pgd_next ((uintptr_t)fixmap_pte)
|
|
#define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd)
|
|
#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot)
|
|
#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot)
|
|
#endif /* __PAGETABLE_PMD_FOLDED */
|
|
|
|
void __init create_pgd_mapping(pgd_t *pgdp,
|
|
uintptr_t va, phys_addr_t pa,
|
|
phys_addr_t sz, pgprot_t prot)
|
|
{
|
|
pgd_next_t *nextp;
|
|
phys_addr_t next_phys;
|
|
uintptr_t pgd_idx = pgd_index(va);
|
|
|
|
if (sz == PGDIR_SIZE) {
|
|
if (pgd_val(pgdp[pgd_idx]) == 0)
|
|
pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
|
|
return;
|
|
}
|
|
|
|
if (pgd_val(pgdp[pgd_idx]) == 0) {
|
|
next_phys = alloc_pgd_next(va);
|
|
pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
|
|
nextp = get_pgd_next_virt(next_phys);
|
|
memset(nextp, 0, PAGE_SIZE);
|
|
} else {
|
|
next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
|
|
nextp = get_pgd_next_virt(next_phys);
|
|
}
|
|
|
|
create_pgd_next_mapping(nextp, va, pa, sz, prot);
|
|
}
|
|
|
|
static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
|
|
{
|
|
/* Upgrade to PMD_SIZE mappings whenever possible */
|
|
if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
|
|
return PAGE_SIZE;
|
|
|
|
return PMD_SIZE;
|
|
}
|
|
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
extern char _xiprom[], _exiprom[], __data_loc;
|
|
|
|
/* called from head.S with MMU off */
|
|
asmlinkage void __init __copy_data(void)
|
|
{
|
|
void *from = (void *)(&__data_loc);
|
|
void *to = (void *)CONFIG_PHYS_RAM_BASE;
|
|
size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
|
|
|
|
memcpy(to, from, sz);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_STRICT_KERNEL_RWX
|
|
static __init pgprot_t pgprot_from_va(uintptr_t va)
|
|
{
|
|
if (is_va_kernel_text(va))
|
|
return PAGE_KERNEL_READ_EXEC;
|
|
|
|
/*
|
|
* In 64-bit kernel, the kernel mapping is outside the linear mapping so
|
|
* we must protect its linear mapping alias from being executed and
|
|
* written.
|
|
* And rodata section is marked readonly in mark_rodata_ro.
|
|
*/
|
|
if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
|
|
return PAGE_KERNEL_READ;
|
|
|
|
return PAGE_KERNEL;
|
|
}
|
|
|
|
void mark_rodata_ro(void)
|
|
{
|
|
set_kernel_memory(__start_rodata, _data, set_memory_ro);
|
|
if (IS_ENABLED(CONFIG_64BIT))
|
|
set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
|
|
set_memory_ro);
|
|
|
|
debug_checkwx();
|
|
}
|
|
#else
|
|
static __init pgprot_t pgprot_from_va(uintptr_t va)
|
|
{
|
|
if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
|
|
return PAGE_KERNEL;
|
|
|
|
return PAGE_KERNEL_EXEC;
|
|
}
|
|
#endif /* CONFIG_STRICT_KERNEL_RWX */
|
|
|
|
#ifdef CONFIG_64BIT
|
|
static void __init disable_pgtable_l4(void)
|
|
{
|
|
pgtable_l4_enabled = false;
|
|
kernel_map.page_offset = PAGE_OFFSET_L3;
|
|
satp_mode = SATP_MODE_39;
|
|
}
|
|
|
|
/*
|
|
* There is a simple way to determine if 4-level is supported by the
|
|
* underlying hardware: establish 1:1 mapping in 4-level page table mode
|
|
* then read SATP to see if the configuration was taken into account
|
|
* meaning sv48 is supported.
|
|
*/
|
|
static __init void set_satp_mode(void)
|
|
{
|
|
u64 identity_satp, hw_satp;
|
|
uintptr_t set_satp_mode_pmd;
|
|
|
|
set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
|
|
create_pgd_mapping(early_pg_dir,
|
|
set_satp_mode_pmd, (uintptr_t)early_pud,
|
|
PGDIR_SIZE, PAGE_TABLE);
|
|
create_pud_mapping(early_pud,
|
|
set_satp_mode_pmd, (uintptr_t)early_pmd,
|
|
PUD_SIZE, PAGE_TABLE);
|
|
/* Handle the case where set_satp_mode straddles 2 PMDs */
|
|
create_pmd_mapping(early_pmd,
|
|
set_satp_mode_pmd, set_satp_mode_pmd,
|
|
PMD_SIZE, PAGE_KERNEL_EXEC);
|
|
create_pmd_mapping(early_pmd,
|
|
set_satp_mode_pmd + PMD_SIZE,
|
|
set_satp_mode_pmd + PMD_SIZE,
|
|
PMD_SIZE, PAGE_KERNEL_EXEC);
|
|
|
|
identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
|
|
|
|
local_flush_tlb_all();
|
|
csr_write(CSR_SATP, identity_satp);
|
|
hw_satp = csr_swap(CSR_SATP, 0ULL);
|
|
local_flush_tlb_all();
|
|
|
|
if (hw_satp != identity_satp)
|
|
disable_pgtable_l4();
|
|
|
|
memset(early_pg_dir, 0, PAGE_SIZE);
|
|
memset(early_pud, 0, PAGE_SIZE);
|
|
memset(early_pmd, 0, PAGE_SIZE);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* setup_vm() is called from head.S with MMU-off.
|
|
*
|
|
* Following requirements should be honoured for setup_vm() to work
|
|
* correctly:
|
|
* 1) It should use PC-relative addressing for accessing kernel symbols.
|
|
* To achieve this we always use GCC cmodel=medany.
|
|
* 2) The compiler instrumentation for FTRACE will not work for setup_vm()
|
|
* so disable compiler instrumentation when FTRACE is enabled.
|
|
*
|
|
* Currently, the above requirements are honoured by using custom CFLAGS
|
|
* for init.o in mm/Makefile.
|
|
*/
|
|
|
|
#ifndef __riscv_cmodel_medany
|
|
#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
|
|
#endif
|
|
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
static void __init create_kernel_page_table(pgd_t *pgdir,
|
|
__always_unused bool early)
|
|
{
|
|
uintptr_t va, end_va;
|
|
|
|
/* Map the flash resident part */
|
|
end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
|
|
for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
|
|
create_pgd_mapping(pgdir, va,
|
|
kernel_map.xiprom + (va - kernel_map.virt_addr),
|
|
PMD_SIZE, PAGE_KERNEL_EXEC);
|
|
|
|
/* Map the data in RAM */
|
|
end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
|
|
for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
|
|
create_pgd_mapping(pgdir, va,
|
|
kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
|
|
PMD_SIZE, PAGE_KERNEL);
|
|
}
|
|
#else
|
|
static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
|
|
{
|
|
uintptr_t va, end_va;
|
|
|
|
end_va = kernel_map.virt_addr + kernel_map.size;
|
|
for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
|
|
create_pgd_mapping(pgdir, va,
|
|
kernel_map.phys_addr + (va - kernel_map.virt_addr),
|
|
PMD_SIZE,
|
|
early ?
|
|
PAGE_KERNEL_EXEC : pgprot_from_va(va));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
|
|
* this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
|
|
* entry.
|
|
*/
|
|
static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
|
|
{
|
|
#ifndef CONFIG_BUILTIN_DTB
|
|
uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
|
|
|
|
create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
|
|
IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa,
|
|
PGDIR_SIZE,
|
|
IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
|
|
|
|
if (pgtable_l4_enabled) {
|
|
create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
|
|
(uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT)) {
|
|
create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
|
|
pa, PMD_SIZE, PAGE_KERNEL);
|
|
create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
|
|
pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
|
|
}
|
|
|
|
dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
|
|
#else
|
|
/*
|
|
* For 64-bit kernel, __va can't be used since it would return a linear
|
|
* mapping address whereas dtb_early_va will be used before
|
|
* setup_vm_final installs the linear mapping. For 32-bit kernel, as the
|
|
* kernel is mapped in the linear mapping, that makes no difference.
|
|
*/
|
|
dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
|
|
#endif
|
|
|
|
dtb_early_pa = dtb_pa;
|
|
}
|
|
|
|
/*
|
|
* MMU is not enabled, the page tables are allocated directly using
|
|
* early_pmd/pud/p4d and the address returned is the physical one.
|
|
*/
|
|
void __init pt_ops_set_early(void)
|
|
{
|
|
pt_ops.alloc_pte = alloc_pte_early;
|
|
pt_ops.get_pte_virt = get_pte_virt_early;
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
pt_ops.alloc_pmd = alloc_pmd_early;
|
|
pt_ops.get_pmd_virt = get_pmd_virt_early;
|
|
pt_ops.alloc_pud = alloc_pud_early;
|
|
pt_ops.get_pud_virt = get_pud_virt_early;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* MMU is enabled but page table setup is not complete yet.
|
|
* fixmap page table alloc functions must be used as a means to temporarily
|
|
* map the allocated physical pages since the linear mapping does not exist yet.
|
|
*
|
|
* Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
|
|
* but it will be used as described above.
|
|
*/
|
|
void __init pt_ops_set_fixmap(void)
|
|
{
|
|
pt_ops.alloc_pte = kernel_mapping_pa_to_va((uintptr_t)alloc_pte_fixmap);
|
|
pt_ops.get_pte_virt = kernel_mapping_pa_to_va((uintptr_t)get_pte_virt_fixmap);
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
pt_ops.alloc_pmd = kernel_mapping_pa_to_va((uintptr_t)alloc_pmd_fixmap);
|
|
pt_ops.get_pmd_virt = kernel_mapping_pa_to_va((uintptr_t)get_pmd_virt_fixmap);
|
|
pt_ops.alloc_pud = kernel_mapping_pa_to_va((uintptr_t)alloc_pud_fixmap);
|
|
pt_ops.get_pud_virt = kernel_mapping_pa_to_va((uintptr_t)get_pud_virt_fixmap);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* MMU is enabled and page table setup is complete, so from now, we can use
|
|
* generic page allocation functions to setup page table.
|
|
*/
|
|
void __init pt_ops_set_late(void)
|
|
{
|
|
pt_ops.alloc_pte = alloc_pte_late;
|
|
pt_ops.get_pte_virt = get_pte_virt_late;
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
pt_ops.alloc_pmd = alloc_pmd_late;
|
|
pt_ops.get_pmd_virt = get_pmd_virt_late;
|
|
pt_ops.alloc_pud = alloc_pud_late;
|
|
pt_ops.get_pud_virt = get_pud_virt_late;
|
|
#endif
|
|
}
|
|
|
|
asmlinkage void __init setup_vm(uintptr_t dtb_pa)
|
|
{
|
|
pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
|
|
|
|
kernel_map.virt_addr = KERNEL_LINK_ADDR;
|
|
kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
|
|
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
|
|
kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
|
|
|
|
phys_ram_base = CONFIG_PHYS_RAM_BASE;
|
|
kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
|
|
kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
|
|
|
|
kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
|
|
#else
|
|
kernel_map.phys_addr = (uintptr_t)(&_start);
|
|
kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
|
|
#endif
|
|
|
|
#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
|
|
set_satp_mode();
|
|
#endif
|
|
|
|
kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
|
|
kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
|
|
|
|
riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr);
|
|
|
|
/*
|
|
* The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
|
|
* kernel, whereas for 64-bit kernel, the end of the virtual address
|
|
* space is occupied by the modules/BPF/kernel mappings which reduces
|
|
* the available size of the linear mapping.
|
|
*/
|
|
memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
|
|
|
|
/* Sanity check alignment and size */
|
|
BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
|
|
BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
|
|
|
|
#ifdef CONFIG_64BIT
|
|
/*
|
|
* The last 4K bytes of the addressable memory can not be mapped because
|
|
* of IS_ERR_VALUE macro.
|
|
*/
|
|
BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
|
|
#endif
|
|
|
|
pt_ops_set_early();
|
|
|
|
/* Setup early PGD for fixmap */
|
|
create_pgd_mapping(early_pg_dir, FIXADDR_START,
|
|
fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
|
|
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
/* Setup fixmap PUD and PMD */
|
|
if (pgtable_l4_enabled)
|
|
create_pud_mapping(fixmap_pud, FIXADDR_START,
|
|
(uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
|
|
create_pmd_mapping(fixmap_pmd, FIXADDR_START,
|
|
(uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
|
|
/* Setup trampoline PGD and PMD */
|
|
create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
|
|
trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
|
|
if (pgtable_l4_enabled)
|
|
create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
|
|
(uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
|
|
kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
|
|
#else
|
|
create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
|
|
kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
|
|
#endif
|
|
#else
|
|
/* Setup trampoline PGD */
|
|
create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
|
|
kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
|
|
#endif
|
|
|
|
/*
|
|
* Setup early PGD covering entire kernel which will allow
|
|
* us to reach paging_init(). We map all memory banks later
|
|
* in setup_vm_final() below.
|
|
*/
|
|
create_kernel_page_table(early_pg_dir, true);
|
|
|
|
/* Setup early mapping for FDT early scan */
|
|
create_fdt_early_page_table(early_pg_dir, dtb_pa);
|
|
|
|
/*
|
|
* Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
|
|
* range can not span multiple pmds.
|
|
*/
|
|
BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
|
|
!= (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
|
|
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
/*
|
|
* Early ioremap fixmap is already created as it lies within first 2MB
|
|
* of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
|
|
* FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
|
|
* the user if not.
|
|
*/
|
|
fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
|
|
fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
|
|
if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
|
|
WARN_ON(1);
|
|
pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
|
|
pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
|
|
pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_BEGIN));
|
|
pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_END));
|
|
|
|
pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
|
|
pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
|
|
}
|
|
#endif
|
|
|
|
pt_ops_set_fixmap();
|
|
}
|
|
|
|
static void __init setup_vm_final(void)
|
|
{
|
|
uintptr_t va, map_size;
|
|
phys_addr_t pa, start, end;
|
|
u64 i;
|
|
|
|
/* Setup swapper PGD for fixmap */
|
|
create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
|
|
__pa_symbol(fixmap_pgd_next),
|
|
PGDIR_SIZE, PAGE_TABLE);
|
|
|
|
/* Map all memory banks in the linear mapping */
|
|
for_each_mem_range(i, &start, &end) {
|
|
if (start >= end)
|
|
break;
|
|
if (start <= __pa(PAGE_OFFSET) &&
|
|
__pa(PAGE_OFFSET) < end)
|
|
start = __pa(PAGE_OFFSET);
|
|
if (end >= __pa(PAGE_OFFSET) + memory_limit)
|
|
end = __pa(PAGE_OFFSET) + memory_limit;
|
|
|
|
map_size = best_map_size(start, end - start);
|
|
for (pa = start; pa < end; pa += map_size) {
|
|
va = (uintptr_t)__va(pa);
|
|
|
|
create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
|
|
pgprot_from_va(va));
|
|
}
|
|
}
|
|
|
|
/* Map the kernel */
|
|
if (IS_ENABLED(CONFIG_64BIT))
|
|
create_kernel_page_table(swapper_pg_dir, false);
|
|
|
|
#ifdef CONFIG_KASAN
|
|
kasan_swapper_init();
|
|
#endif
|
|
|
|
/* Clear fixmap PTE and PMD mappings */
|
|
clear_fixmap(FIX_PTE);
|
|
clear_fixmap(FIX_PMD);
|
|
clear_fixmap(FIX_PUD);
|
|
|
|
/* Move to swapper page table */
|
|
csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
|
|
local_flush_tlb_all();
|
|
|
|
pt_ops_set_late();
|
|
}
|
|
#else
|
|
asmlinkage void __init setup_vm(uintptr_t dtb_pa)
|
|
{
|
|
dtb_early_va = (void *)dtb_pa;
|
|
dtb_early_pa = dtb_pa;
|
|
}
|
|
|
|
static inline void setup_vm_final(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
/*
|
|
* reserve_crashkernel() - reserves memory for crash kernel
|
|
*
|
|
* This function reserves memory area given in "crashkernel=" kernel command
|
|
* line parameter. The memory reserved is used by dump capture kernel when
|
|
* primary kernel is crashing.
|
|
*/
|
|
static void __init reserve_crashkernel(void)
|
|
{
|
|
unsigned long long crash_base = 0;
|
|
unsigned long long crash_size = 0;
|
|
unsigned long search_start = memblock_start_of_DRAM();
|
|
unsigned long search_end = memblock_end_of_DRAM();
|
|
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Don't reserve a region for a crash kernel on a crash kernel
|
|
* since it doesn't make much sense and we have limited memory
|
|
* resources.
|
|
*/
|
|
if (is_kdump_kernel()) {
|
|
pr_info("crashkernel: ignoring reservation request\n");
|
|
return;
|
|
}
|
|
|
|
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
|
|
&crash_size, &crash_base);
|
|
if (ret || !crash_size)
|
|
return;
|
|
|
|
crash_size = PAGE_ALIGN(crash_size);
|
|
|
|
if (crash_base) {
|
|
search_start = crash_base;
|
|
search_end = crash_base + crash_size;
|
|
}
|
|
|
|
/*
|
|
* Current riscv boot protocol requires 2MB alignment for
|
|
* RV64 and 4MB alignment for RV32 (hugepage size)
|
|
*
|
|
* Try to alloc from 32bit addressible physical memory so that
|
|
* swiotlb can work on the crash kernel.
|
|
*/
|
|
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
|
|
search_start,
|
|
min(search_end, (unsigned long) SZ_4G));
|
|
if (crash_base == 0) {
|
|
/* Try again without restricting region to 32bit addressible memory */
|
|
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
|
|
search_start, search_end);
|
|
if (crash_base == 0) {
|
|
pr_warn("crashkernel: couldn't allocate %lldKB\n",
|
|
crash_size >> 10);
|
|
return;
|
|
}
|
|
}
|
|
|
|
pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
|
|
crash_base, crash_base + crash_size, crash_size >> 20);
|
|
|
|
crashk_res.start = crash_base;
|
|
crashk_res.end = crash_base + crash_size - 1;
|
|
}
|
|
#endif /* CONFIG_KEXEC_CORE */
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
setup_bootmem();
|
|
setup_vm_final();
|
|
}
|
|
|
|
void __init misc_mem_init(void)
|
|
{
|
|
early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
|
|
arch_numa_init();
|
|
sparse_init();
|
|
zone_sizes_init();
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
reserve_crashkernel();
|
|
#endif
|
|
memblock_dump_all();
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
return vmemmap_populate_basepages(start, end, node, NULL);
|
|
}
|
|
#endif
|