189 lines
4.5 KiB
C
189 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* This file contains the routines setting up the linux page tables.
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* -- paulus
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*
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* Derived from arch/ppc/mm/init.c:
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <linux/set_memory.h>
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#include <asm/pgalloc.h>
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#include <asm/fixmap.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/early_ioremap.h>
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#include <mm/mmu_decl.h>
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static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data;
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notrace void __init early_ioremap_init(void)
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{
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unsigned long addr = ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE);
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pte_t *ptep = (pte_t *)early_fixmap_pagetable;
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pmd_t *pmdp = pmd_off_k(addr);
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for (; (s32)(FIXADDR_TOP - addr) > 0;
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addr += PGDIR_SIZE, ptep += PTRS_PER_PTE, pmdp++)
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pmd_populate_kernel(&init_mm, pmdp, ptep);
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early_ioremap_setup();
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}
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static void __init *early_alloc_pgtable(unsigned long size)
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{
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void *ptr = memblock_alloc(size, size);
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if (!ptr)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, size, size);
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return ptr;
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}
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pte_t __init *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va)
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{
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if (pmd_none(*pmdp)) {
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pte_t *ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
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pmd_populate_kernel(&init_mm, pmdp, ptep);
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}
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return pte_offset_kernel(pmdp, va);
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}
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int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
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{
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pmd_t *pd;
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pte_t *pg;
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int err = -ENOMEM;
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/* Use upper 10 bits of VA to index the first level map */
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pd = pmd_off_k(va);
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/* Use middle 10 bits of VA to index the second-level map */
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if (likely(slab_is_available()))
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pg = pte_alloc_kernel(pd, va);
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else
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pg = early_pte_alloc_kernel(pd, va);
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if (pg) {
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err = 0;
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/* The PTE should never be already set nor present in the
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* hash table
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*/
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BUG_ON((pte_present(*pg) | pte_hashpte(*pg)) && pgprot_val(prot));
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set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, prot));
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}
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smp_wmb();
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return err;
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}
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/*
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* Map in a chunk of physical memory starting at start.
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*/
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static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
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{
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unsigned long v, s;
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phys_addr_t p;
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bool ktext;
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s = offset;
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v = PAGE_OFFSET + s;
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p = memstart_addr + s;
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for (; s < top; s += PAGE_SIZE) {
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ktext = core_kernel_text(v);
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map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
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v += PAGE_SIZE;
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p += PAGE_SIZE;
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}
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}
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void __init mapin_ram(void)
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{
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phys_addr_t base, end;
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u64 i;
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for_each_mem_range(i, &base, &end) {
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phys_addr_t top = min(end, total_lowmem);
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if (base >= top)
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continue;
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base = mmu_mapin_ram(base, top);
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__mapin_ram_chunk(base, top);
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}
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}
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void mark_initmem_nx(void)
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{
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unsigned long numpages = PFN_UP((unsigned long)_einittext) -
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PFN_DOWN((unsigned long)_sinittext);
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mmu_mark_initmem_nx();
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if (!v_block_mapped((unsigned long)_sinittext)) {
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set_memory_nx((unsigned long)_sinittext, numpages);
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set_memory_rw((unsigned long)_sinittext, numpages);
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}
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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void mark_rodata_ro(void)
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{
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unsigned long numpages;
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if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && mmu_has_feature(MMU_FTR_HPTE_TABLE))
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pr_warn("This platform has HASH MMU, STRICT_MODULE_RWX won't work\n");
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if (v_block_mapped((unsigned long)_stext + 1)) {
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mmu_mark_rodata_ro();
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ptdump_check_wx();
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return;
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}
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/*
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* mark text and rodata as read only. __end_rodata is set by
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* powerpc's linker script and includes tables and data
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* requiring relocation which are not put in RO_DATA.
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*/
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numpages = PFN_UP((unsigned long)__end_rodata) -
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PFN_DOWN((unsigned long)_stext);
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set_memory_ro((unsigned long)_stext, numpages);
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// mark_initmem_nx() should have already run by now
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ptdump_check_wx();
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}
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#endif
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#if defined(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && defined(CONFIG_DEBUG_PAGEALLOC)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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unsigned long addr = (unsigned long)page_address(page);
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if (PageHighMem(page))
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return;
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if (enable)
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set_memory_p(addr, numpages);
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else
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set_memory_np(addr, numpages);
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}
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#endif /* CONFIG_DEBUG_PAGEALLOC */
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