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
9int __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