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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Andes Technology Corporation
#include <linux/pfn.h>
#include <linux/init_task.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/fixmap.h>
#include <asm/pgalloc.h>
static __init void *early_alloc(size_t size, int node)
{
void *ptr = memblock_alloc_try_nid(size, size,
__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, node);
if (!ptr)
panic("%pS: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
__func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
return ptr;
}
extern pgd_t early_pg_dir[PTRS_PER_PGD];
asmlinkage void __init kasan_early_init(void)
{
uintptr_t i;
pgd_t *pgd = early_pg_dir + pgd_index(KASAN_SHADOW_START);
for (i = 0; i < PTRS_PER_PTE; ++i)
set_pte(kasan_early_shadow_pte + i,
mk_pte(virt_to_page(kasan_early_shadow_page),
PAGE_KERNEL));
for (i = 0; i < PTRS_PER_PMD; ++i)
set_pmd(kasan_early_shadow_pmd + i,
pfn_pmd(PFN_DOWN
(__pa((uintptr_t) kasan_early_shadow_pte)),
__pgprot(_PAGE_TABLE)));
for (i = KASAN_SHADOW_START; i < KASAN_SHADOW_END;
i += PGDIR_SIZE, ++pgd)
set_pgd(pgd,
pfn_pgd(PFN_DOWN
(__pa(((uintptr_t) kasan_early_shadow_pmd))),
__pgprot(_PAGE_TABLE)));
/* init for swapper_pg_dir */
pgd = pgd_offset_k(KASAN_SHADOW_START);
for (i = KASAN_SHADOW_START; i < KASAN_SHADOW_END;
i += PGDIR_SIZE, ++pgd)
set_pgd(pgd,
pfn_pgd(PFN_DOWN
(__pa(((uintptr_t) kasan_early_shadow_pmd))),
__pgprot(_PAGE_TABLE)));
local_flush_tlb_all();
}
static void __init populate(void *start, void *end)
{
unsigned long i, offset;
unsigned long vaddr = (unsigned long)start & PAGE_MASK;
unsigned long vend = PAGE_ALIGN((unsigned long)end);
unsigned long n_pages = (vend - vaddr) / PAGE_SIZE;
unsigned long n_ptes =
((n_pages + PTRS_PER_PTE) & -PTRS_PER_PTE) / PTRS_PER_PTE;
unsigned long n_pmds =
((n_ptes + PTRS_PER_PMD) & -PTRS_PER_PMD) / PTRS_PER_PMD;
pte_t *pte =
memblock_alloc(n_ptes * PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE);
pmd_t *pmd =
memblock_alloc(n_pmds * PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);
pgd_t *pgd = pgd_offset_k(vaddr);
for (i = 0; i < n_pages; i++) {
phys_addr_t phys = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
set_pte(&pte[i], pfn_pte(PHYS_PFN(phys), PAGE_KERNEL));
}
for (i = 0, offset = 0; i < n_ptes; i++, offset += PTRS_PER_PTE)
set_pmd(&pmd[i],
pfn_pmd(PFN_DOWN(__pa(&pte[offset])),
__pgprot(_PAGE_TABLE)));
for (i = 0, offset = 0; i < n_pmds; i++, offset += PTRS_PER_PMD)
set_pgd(&pgd[i],
pfn_pgd(PFN_DOWN(__pa(&pmd[offset])),
__pgprot(_PAGE_TABLE)));
local_flush_tlb_all();
memset(start, 0, end - start);
}
void __init kasan_shallow_populate(void *start, void *end)
{
unsigned long vaddr = (unsigned long)start & PAGE_MASK;
unsigned long vend = PAGE_ALIGN((unsigned long)end);
unsigned long pfn;
int index;
void *p;
pud_t *pud_dir, *pud_k;
pgd_t *pgd_dir, *pgd_k;
p4d_t *p4d_dir, *p4d_k;
while (vaddr < vend) {
index = pgd_index(vaddr);
pfn = csr_read(CSR_SATP) & SATP_PPN;
pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
pgd_k = init_mm.pgd + index;
pgd_dir = pgd_offset_k(vaddr);
set_pgd(pgd_dir, *pgd_k);
p4d_dir = p4d_offset(pgd_dir, vaddr);
p4d_k = p4d_offset(pgd_k, vaddr);
vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
pud_dir = pud_offset(p4d_dir, vaddr);
pud_k = pud_offset(p4d_k, vaddr);
if (pud_present(*pud_dir)) {
p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
pud_populate(&init_mm, pud_dir, p);
}
vaddr += PAGE_SIZE;
}
}
void __init kasan_init(void)
{
phys_addr_t _start, _end;
u64 i;
kasan_populate_early_shadow((void *)KASAN_SHADOW_START,
(void *)kasan_mem_to_shadow((void *)
VMEMMAP_END));
if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
kasan_shallow_populate(
(void *)kasan_mem_to_shadow((void *)VMALLOC_START),
(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
else
kasan_populate_early_shadow(
(void *)kasan_mem_to_shadow((void *)VMALLOC_START),
(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
for_each_mem_range(i, &_start, &_end) {
void *start = (void *)_start;
void *end = (void *)_end;
if (start >= end)
break;
populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end));
};
for (i = 0; i < PTRS_PER_PTE; i++)
set_pte(&kasan_early_shadow_pte[i],
mk_pte(virt_to_page(kasan_early_shadow_page),
__pgprot(_PAGE_PRESENT | _PAGE_READ |
_PAGE_ACCESSED)));
memset(kasan_early_shadow_page, 0, PAGE_SIZE);
init_task.kasan_depth = 0;
}
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