1 // SPDX-License-Identifier: GPL-2.0
2
3 #define DISABLE_BRANCH_PROFILING
4
5 #include <linux/kasan.h>
6 #include <linux/memblock.h>
7 #include <mm/mmu_decl.h>
8
kasan_init_region(void * start,size_t size)9 int __init kasan_init_region(void *start, size_t size)
10 {
11 unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
12 unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
13 unsigned long k_nobat = k_start;
14 unsigned long k_cur;
15 phys_addr_t phys;
16 int ret;
17
18 while (k_nobat < k_end) {
19 unsigned int k_size = bat_block_size(k_nobat, k_end);
20 int idx = find_free_bat();
21
22 if (idx == -1)
23 break;
24 if (k_size < SZ_128K)
25 break;
26 phys = memblock_phys_alloc_range(k_size, k_size, 0,
27 MEMBLOCK_ALLOC_ANYWHERE);
28 if (!phys)
29 break;
30
31 setbat(idx, k_nobat, phys, k_size, PAGE_KERNEL);
32 k_nobat += k_size;
33 }
34 if (k_nobat != k_start)
35 update_bats();
36
37 if (k_nobat < k_end) {
38 phys = memblock_phys_alloc_range(k_end - k_nobat, PAGE_SIZE, 0,
39 MEMBLOCK_ALLOC_ANYWHERE);
40 if (!phys)
41 return -ENOMEM;
42 }
43
44 ret = kasan_init_shadow_page_tables(k_start, k_end);
45 if (ret)
46 return ret;
47
48 kasan_update_early_region(k_start, k_nobat, __pte(0));
49
50 for (k_cur = k_nobat; k_cur < k_end; k_cur += PAGE_SIZE) {
51 pmd_t *pmd = pmd_off_k(k_cur);
52 pte_t pte = pfn_pte(PHYS_PFN(phys + k_cur - k_nobat), PAGE_KERNEL);
53
54 __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
55 }
56 flush_tlb_kernel_range(k_start, k_end);
57 memset(kasan_mem_to_shadow(start), 0, k_end - k_start);
58
59 return 0;
60 }
61