61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define DISABLE_BRANCH_PROFILING
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#include <linux/kasan.h>
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#include <linux/memblock.h>
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#include <mm/mmu_decl.h>
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int __init kasan_init_region(void *start, size_t size)
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{
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unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
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unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
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unsigned long k_nobat = k_start;
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unsigned long k_cur;
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phys_addr_t phys;
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int ret;
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while (k_nobat < k_end) {
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unsigned int k_size = bat_block_size(k_nobat, k_end);
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int idx = find_free_bat();
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if (idx == -1)
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break;
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if (k_size < SZ_128K)
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break;
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phys = memblock_phys_alloc_range(k_size, k_size, 0,
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MEMBLOCK_ALLOC_ANYWHERE);
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if (!phys)
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break;
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setbat(idx, k_nobat, phys, k_size, PAGE_KERNEL);
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k_nobat += k_size;
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}
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if (k_nobat != k_start)
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update_bats();
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if (k_nobat < k_end) {
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phys = memblock_phys_alloc_range(k_end - k_nobat, PAGE_SIZE, 0,
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MEMBLOCK_ALLOC_ANYWHERE);
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if (!phys)
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return -ENOMEM;
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}
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ret = kasan_init_shadow_page_tables(k_start, k_end);
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if (ret)
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return ret;
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kasan_update_early_region(k_start, k_nobat, __pte(0));
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for (k_cur = k_nobat; k_cur < k_end; k_cur += PAGE_SIZE) {
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pmd_t *pmd = pmd_off_k(k_cur);
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pte_t pte = pfn_pte(PHYS_PFN(phys + k_cur - k_nobat), PAGE_KERNEL);
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__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
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}
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flush_tlb_kernel_range(k_start, k_end);
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memset(kasan_mem_to_shadow(start), 0, k_end - k_start);
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return 0;
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}
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