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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file contains the routines setting up the linux page tables.
* -- paulus
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/early_ioremap.h>
#include <mm/mmu_decl.h>
extern char etext[], _stext[], _sinittext[], _einittext[];
static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data;
notrace void __init early_ioremap_init(void)
{
unsigned long addr = ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE);
pte_t *ptep = (pte_t *)early_fixmap_pagetable;
pmd_t *pmdp = pmd_off_k(addr);
for (; (s32)(FIXADDR_TOP - addr) > 0;
addr += PGDIR_SIZE, ptep += PTRS_PER_PTE, pmdp++)
pmd_populate_kernel(&init_mm, pmdp, ptep);
early_ioremap_setup();
}
static void __init *early_alloc_pgtable(unsigned long size)
{
void *ptr = memblock_alloc(size, size);
if (!ptr)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, size, size);
return ptr;
}
pte_t __init *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va)
{
if (pmd_none(*pmdp)) {
pte_t *ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
pmd_populate_kernel(&init_mm, pmdp, ptep);
}
return pte_offset_kernel(pmdp, va);
}
int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
{
pmd_t *pd;
pte_t *pg;
int err = -ENOMEM;
/* Use upper 10 bits of VA to index the first level map */
pd = pmd_off_k(va);
/* Use middle 10 bits of VA to index the second-level map */
if (likely(slab_is_available()))
pg = pte_alloc_kernel(pd, va);
else
pg = early_pte_alloc_kernel(pd, va);
if (pg) {
err = 0;
/* The PTE should never be already set nor present in the
* hash table
*/
BUG_ON((pte_present(*pg) | pte_hashpte(*pg)) && pgprot_val(prot));
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, prot));
}
smp_wmb();
return err;
}
/*
* Map in a chunk of physical memory starting at start.
*/
static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
{
unsigned long v, s;
phys_addr_t p;
int ktext;
s = offset;
v = PAGE_OFFSET + s;
p = memstart_addr + s;
for (; s < top; s += PAGE_SIZE) {
ktext = ((char *)v >= _stext && (char *)v < etext) ||
((char *)v >= _sinittext && (char *)v < _einittext);
map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
v += PAGE_SIZE;
p += PAGE_SIZE;
}
}
void __init mapin_ram(void)
{
phys_addr_t base, end;
u64 i;
for_each_mem_range(i, &base, &end) {
phys_addr_t top = min(end, total_lowmem);
if (base >= top)
continue;
base = mmu_mapin_ram(base, top);
__mapin_ram_chunk(base, top);
}
}
static int __change_page_attr_noflush(struct page *page, pgprot_t prot)
{
pte_t *kpte;
unsigned long address;
BUG_ON(PageHighMem(page));
address = (unsigned long)page_address(page);
if (v_block_mapped(address))
return 0;
kpte = virt_to_kpte(address);
if (!kpte)
return -EINVAL;
__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
return 0;
}
/*
* Change the page attributes of an page in the linear mapping.
*
* THIS DOES NOTHING WITH BAT MAPPINGS, DEBUG USE ONLY
*/
static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
{
int i, err = 0;
unsigned long flags;
struct page *start = page;
local_irq_save(flags);
for (i = 0; i < numpages; i++, page++) {
err = __change_page_attr_noflush(page, prot);
if (err)
break;
}
wmb();
local_irq_restore(flags);
flush_tlb_kernel_range((unsigned long)page_address(start),
(unsigned long)page_address(page));
return err;
}
void mark_initmem_nx(void)
{
struct page *page = virt_to_page(_sinittext);
unsigned long numpages = PFN_UP((unsigned long)_einittext) -
PFN_DOWN((unsigned long)_sinittext);
if (v_block_mapped((unsigned long)_sinittext))
mmu_mark_initmem_nx();
else
change_page_attr(page, numpages, PAGE_KERNEL);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
struct page *page;
unsigned long numpages;
if (v_block_mapped((unsigned long)_stext + 1)) {
mmu_mark_rodata_ro();
ptdump_check_wx();
return;
}
page = virt_to_page(_stext);
numpages = PFN_UP((unsigned long)_etext) -
PFN_DOWN((unsigned long)_stext);
change_page_attr(page, numpages, PAGE_KERNEL_ROX);
/*
* mark .rodata as read only. Use __init_begin rather than __end_rodata
* to cover NOTES and EXCEPTION_TABLE.
*/
page = virt_to_page(__start_rodata);
numpages = PFN_UP((unsigned long)__init_begin) -
PFN_DOWN((unsigned long)__start_rodata);
change_page_attr(page, numpages, PAGE_KERNEL_RO);
// mark_initmem_nx() should have already run by now
ptdump_check_wx();
}
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
void __kernel_map_pages(struct page *page, int numpages, int enable)
{
if (PageHighMem(page))
return;
change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
}
#endif /* CONFIG_DEBUG_PAGEALLOC */
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