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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * KFENCE support for LoongArch. |
| 4 | * |
| 5 | * Author: Enze Li <lienze@kylinos.cn> |
| 6 | * Copyright (C) 2022-2023 KylinSoft Corporation. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _ASM_LOONGARCH_KFENCE_H |
| 10 | #define _ASM_LOONGARCH_KFENCE_H |
| 11 | |
| 12 | #include <linux/kfence.h> |
| 13 | #include <linux/vmalloc.h> |
| 14 | #include <asm/pgtable.h> |
| 15 | #include <asm/tlb.h> |
| 16 | |
| 17 | static inline bool arch_kfence_init_pool(void) |
| 18 | { |
| 19 | int err; |
| 20 | char *kaddr, *vaddr; |
| 21 | char *kfence_pool = __kfence_pool; |
| 22 | struct vm_struct *area; |
| 23 | |
| 24 | area = __get_vm_area_caller(KFENCE_POOL_SIZE, VM_IOREMAP, |
| 25 | KFENCE_AREA_START, KFENCE_AREA_END, |
| 26 | __builtin_return_address(0)); |
| 27 | if (!area) |
| 28 | return false; |
| 29 | |
| 30 | __kfence_pool = (char *)area->addr; |
| 31 | err = ioremap_page_range((unsigned long)__kfence_pool, |
| 32 | (unsigned long)__kfence_pool + KFENCE_POOL_SIZE, |
| 33 | virt_to_phys((void *)kfence_pool), PAGE_KERNEL); |
| 34 | if (err) { |
| 35 | free_vm_area(area); |
| 36 | __kfence_pool = kfence_pool; |
| 37 | return false; |
| 38 | } |
| 39 | |
| 40 | kaddr = kfence_pool; |
| 41 | vaddr = __kfence_pool; |
| 42 | while (kaddr < kfence_pool + KFENCE_POOL_SIZE) { |
| 43 | set_page_address(virt_to_page(kaddr), vaddr); |
| 44 | kaddr += PAGE_SIZE; |
| 45 | vaddr += PAGE_SIZE; |
| 46 | } |
| 47 | |
| 48 | return true; |
| 49 | } |
| 50 | |
| 51 | /* Protect the given page and flush TLB. */ |
| 52 | static inline bool kfence_protect_page(unsigned long addr, bool protect) |
| 53 | { |
| 54 | pte_t *pte = virt_to_kpte(addr); |
| 55 | |
| 56 | if (WARN_ON(!pte) || pte_none(ptep_get(pte))) |
| 57 | return false; |
| 58 | |
| 59 | if (protect) |
| 60 | set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~(_PAGE_VALID | _PAGE_PRESENT))); |
| 61 | else |
| 62 | set_pte(pte, __pte(pte_val(ptep_get(pte)) | (_PAGE_VALID | _PAGE_PRESENT))); |
| 63 | |
| 64 | preempt_disable(); |
| 65 | local_flush_tlb_one(addr); |
| 66 | preempt_enable(); |
| 67 | |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | #endif /* _ASM_LOONGARCH_KFENCE_H */ |
| 72 |
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