diff options
Diffstat (limited to 'arch/powerpc/mm/kasan/8xx.c')
-rw-r--r-- | arch/powerpc/mm/kasan/8xx.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/powerpc/mm/kasan/8xx.c b/arch/powerpc/mm/kasan/8xx.c new file mode 100644 index 000000000000..569d98a41881 --- /dev/null +++ b/arch/powerpc/mm/kasan/8xx.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define DISABLE_BRANCH_PROFILING + +#include <linux/kasan.h> +#include <linux/memblock.h> +#include <linux/hugetlb.h> +#include <asm/pgalloc.h> + +static int __init +kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block) +{ + pmd_t *pmd = pmd_off_k(k_start); + unsigned long k_cur, k_next; + + for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) { + pte_basic_t *new; + + k_next = pgd_addr_end(k_cur, k_end); + k_next = pgd_addr_end(k_next, k_end); + if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) + continue; + + new = memblock_alloc(sizeof(pte_basic_t), SZ_4K); + if (!new) + return -ENOMEM; + + *new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL))); + + hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M); + hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M); + } + return 0; +} + +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; + int ret; + void *block; + + block = memblock_alloc(k_end - k_start, SZ_8M); + if (!block) + return -ENOMEM; + + if (IS_ALIGNED(k_start, SZ_8M)) { + kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block); + k_cur = ALIGN_DOWN(k_end, SZ_8M); + if (k_cur == k_end) + goto finish; + } else { + k_cur = k_start; + } + + ret = kasan_init_shadow_page_tables(k_start, k_end); + if (ret) + return ret; + + 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); + + if (k_cur < ALIGN_DOWN(k_end, SZ_512K)) + pte = pte_mkhuge(pte); + + __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); + } +finish: + flush_tlb_kernel_range(k_start, k_end); + return 0; +} |