57 lines
1.5 KiB
C
57 lines
1.5 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_cur = k_start;
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int k_size = k_end - k_start;
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int k_size_base = 1 << (ffs(k_size) - 1);
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int ret;
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void *block;
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block = memblock_alloc(k_size, k_size_base);
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if (block && k_size_base >= SZ_128K && k_start == ALIGN(k_start, k_size_base)) {
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int k_size_more = 1 << (ffs(k_size - k_size_base) - 1);
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setbat(-1, k_start, __pa(block), k_size_base, PAGE_KERNEL);
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if (k_size_more >= SZ_128K)
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setbat(-1, k_start + k_size_base, __pa(block) + k_size_base,
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k_size_more, PAGE_KERNEL);
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if (v_block_mapped(k_start))
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k_cur = k_start + k_size_base;
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if (v_block_mapped(k_start + k_size_base))
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k_cur = k_start + k_size_base + k_size_more;
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update_bats();
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}
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if (!block)
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block = memblock_alloc(k_size, PAGE_SIZE);
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if (!block)
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return -ENOMEM;
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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_cur, __pte(0));
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for (; k_cur < k_end; k_cur += PAGE_SIZE) {
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pmd_t *pmd = pmd_off_k(k_cur);
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void *va = block + k_cur - k_start;
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pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), 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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return 0;
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}
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