#include <linux/init.h>
#include <linux/export.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <linux/memremap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>
#include <linux/hardirq.h>
#include <linux/gfp.h>
#include <linux/hugetlb.h>
#include <linux/mmzone.h>
#include <linux/execmem.h>
#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
int __ref page_is_ram(unsigned long pfn)
{
unsigned long addr = PFN_PHYS(pfn);
return memblock_is_memory(addr) && !memblock_is_reserved(addr);
}
void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
{
#ifdef CONFIG_ZONE_DMA32
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
#endif
}
void __ref free_initmem(void)
{
free_initmem_default(POISON_FREE_INITMEM);
}
#ifdef CONFIG_HIGHMEM
void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int i, j, k;
int ptrs_per_pgd;
unsigned long vaddr;
vaddr = start;
i = pgd_index(vaddr);
j = pud_index(vaddr);
k = pmd_index(vaddr);
pgd = pgd_base + i;
ptrs_per_pgd = min((1 << (BITS_PER_LONG - PGDIR_SHIFT)), PTRS_PER_PGD);
for ( ; (i < ptrs_per_pgd) && (vaddr < end); pgd++, i++) {
pud = (pud_t *)pgd;
for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
pmd = (pmd_t *)pud;
for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
if (pmd_none(*pmd)) {
pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate %lu bytes align=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
kernel_pte_init(pte);
set_pmd(pmd, __pmd((unsigned long)pte));
BUG_ON(pte != pte_offset_kernel(pmd, 0));
}
vaddr += PMD_SIZE;
}
k = 0;
}
j = 0;
}
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
ret = __add_pages(nid, start_pfn, nr_pages, params);
if (ret)
pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);
return ret;
}
void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
__remove_pages(start_pfn, nr_pages, altmap, pgmap);
}
#endif
#ifdef CONFIG_SPARSEMEM_VMEMMAP
void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
unsigned long addr, unsigned long next)
{
pmd_t entry;
entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL);
pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL;
set_pmd_at(&init_mm, addr, pmd, entry);
}
int __meminit vmemmap_populate(unsigned long start, unsigned long end,
int node, struct vmem_altmap *altmap)
{
#if CONFIG_PGTABLE_LEVELS == 2
return vmemmap_populate_basepages(start, end, node, NULL);
#else
return vmemmap_populate_hugepages(start, end, node, NULL);
#endif
}
#ifdef CONFIG_MEMORY_HOTPLUG
void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap)
{
}
#endif
#endif
pte_t * __init populate_kernel_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d = p4d_offset(pgd, addr);
pud_t *pud;
pmd_t *pmd;
if (p4d_none(p4dp_get(p4d))) {
pud = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
p4d_populate(&init_mm, p4d, pud);
#ifndef __PAGETABLE_PUD_FOLDED
pud_init(pud);
#endif
}
pud = pud_offset(p4d, addr);
if (pud_none(pudp_get(pud))) {
pmd = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
pud_populate(&init_mm, pud, pmd);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_init(pmd);
#endif
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(pmdp_get(pmd))) {
pte_t *pte;
pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte);
kernel_pte_init(pte);
}
return pte_offset_kernel(pmd, addr);
}
void __init __set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags)
{
unsigned long addr = __fix_to_virt(idx);
pte_t *ptep;
BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
ptep = populate_kernel_pte(addr);
if (!pte_none(ptep_get(ptep))) {
pte_ERROR(*ptep);
return;
}
if (pgprot_val(flags))
set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags));
else {
pte_clear(&init_mm, addr, ptep);
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
}
}
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss;
#ifndef __PAGETABLE_PUD_FOLDED
pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pud_table);
#endif
#ifndef __PAGETABLE_PMD_FOLDED
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pmd_table);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);
#if defined(CONFIG_EXECMEM) && defined(MODULES_VADDR)
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif
