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// SPDX-License-Identifier: GPL-2.0
#define DISABLE_BRANCH_PROFILING
#include <linux/kasan.h>
#include <linux/memblock.h>
#include <mm/mmu_decl.h>
int __init kasan_init_region(void *start, size_t size)
{
unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
unsigned long k_cur = k_start;
int k_size = k_end - k_start;
int k_size_base = 1 << (ffs(k_size) - 1);
int ret;
void *block;
block = memblock_alloc(k_size, k_size_base);
if (block && k_size_base >= SZ_128K && k_start == ALIGN(k_start, k_size_base)) {
int shift = ffs(k_size - k_size_base);
int k_size_more = shift ? 1 << (shift - 1) : 0;
setbat(-1, k_start, __pa(block), k_size_base, PAGE_KERNEL);
if (k_size_more >= SZ_128K)
setbat(-1, k_start + k_size_base, __pa(block) + k_size_base,
k_size_more, PAGE_KERNEL);
if (v_block_mapped(k_start))
k_cur = k_start + k_size_base;
if (v_block_mapped(k_start + k_size_base))
k_cur = k_start + k_size_base + k_size_more;
update_bats();
}
if (!block)
block = memblock_alloc(k_size, PAGE_SIZE);
if (!block)
return -ENOMEM;
ret = kasan_init_shadow_page_tables(k_start, k_end);
if (ret)
return ret;
kasan_update_early_region(k_start, k_cur, __pte(0));
for (; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_off_k(k_cur);
void *va = block + k_cur - k_start;
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
}
flush_tlb_kernel_range(k_start, k_end);
return 0;
}
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