^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file contains the routines setting up the linux page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * -- paulus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Derived from arch/ppc/mm/init.c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * and Cort Dougan (PReP) (cort@cs.nmt.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (C) 1996 Paul Mackerras
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Derived from "arch/i386/mm/init.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/early_ioremap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <mm/mmu_decl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) extern char etext[], _stext[], _sinittext[], _einittext[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) notrace void __init early_ioremap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long addr = ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) pte_t *ptep = (pte_t *)early_fixmap_pagetable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) pmd_t *pmdp = pmd_off_k(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) for (; (s32)(FIXADDR_TOP - addr) > 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) addr += PGDIR_SIZE, ptep += PTRS_PER_PTE, pmdp++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pmd_populate_kernel(&init_mm, pmdp, ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) early_ioremap_setup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static void __init *early_alloc_pgtable(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) void *ptr = memblock_alloc(size, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) __func__, size, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) pte_t __init *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (pmd_none(*pmdp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) pte_t *ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) pmd_populate_kernel(&init_mm, pmdp, ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return pte_offset_kernel(pmdp, va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) pmd_t *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pte_t *pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Use upper 10 bits of VA to index the first level map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) pd = pmd_off_k(va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* Use middle 10 bits of VA to index the second-level map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (likely(slab_is_available()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) pg = pte_alloc_kernel(pd, va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pg = early_pte_alloc_kernel(pd, va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (pg != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* The PTE should never be already set nor present in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * hash table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) BUG_ON((pte_present(*pg) | pte_hashpte(*pg)) && pgprot_val(prot));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, prot));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * Map in a chunk of physical memory starting at start.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) unsigned long v, s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) phys_addr_t p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int ktext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) s = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) v = PAGE_OFFSET + s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) p = memstart_addr + s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) for (; s < top; s += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ktext = ((char *)v >= _stext && (char *)v < etext) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ((char *)v >= _sinittext && (char *)v < _einittext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #ifdef CONFIG_PPC_BOOK3S_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (ktext)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) hash_preload(&init_mm, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) v += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) p += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) void __init mapin_ram(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) phys_addr_t base, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) u64 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) for_each_mem_range(i, &base, &end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) phys_addr_t top = min(end, total_lowmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (base >= top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) base = mmu_mapin_ram(base, top);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) __mapin_ram_chunk(base, top);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int __change_page_attr_noflush(struct page *page, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) pte_t *kpte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) unsigned long address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) BUG_ON(PageHighMem(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) address = (unsigned long)page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (v_block_mapped(address))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) kpte = virt_to_kpte(address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (!kpte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * Change the page attributes of an page in the linear mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * THIS DOES NOTHING WITH BAT MAPPINGS, DEBUG USE ONLY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int i, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct page *start = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) for (i = 0; i < numpages; i++, page++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) err = __change_page_attr_noflush(page, prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) flush_tlb_kernel_range((unsigned long)page_address(start),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) (unsigned long)page_address(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) void mark_initmem_nx(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct page *page = virt_to_page(_sinittext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsigned long numpages = PFN_UP((unsigned long)_einittext) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) PFN_DOWN((unsigned long)_sinittext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (v_block_mapped((unsigned long)_sinittext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) mmu_mark_initmem_nx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) change_page_attr(page, numpages, PAGE_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #ifdef CONFIG_STRICT_KERNEL_RWX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) void mark_rodata_ro(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) unsigned long numpages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (v_block_mapped((unsigned long)_stext + 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mmu_mark_rodata_ro();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ptdump_check_wx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) page = virt_to_page(_stext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) numpages = PFN_UP((unsigned long)_etext) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) PFN_DOWN((unsigned long)_stext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) change_page_attr(page, numpages, PAGE_KERNEL_ROX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * mark .rodata as read only. Use __init_begin rather than __end_rodata
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * to cover NOTES and EXCEPTION_TABLE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) page = virt_to_page(__start_rodata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) numpages = PFN_UP((unsigned long)__init_begin) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) PFN_DOWN((unsigned long)__start_rodata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) change_page_attr(page, numpages, PAGE_KERNEL_RO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) // mark_initmem_nx() should have already run by now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) ptdump_check_wx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) #ifdef CONFIG_DEBUG_PAGEALLOC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) void __kernel_map_pages(struct page *page, int numpages, int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (PageHighMem(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) #endif /* CONFIG_DEBUG_PAGEALLOC */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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