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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#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>
unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
{
void *vfrom, *vto;
vfrom = kmap_local_page(from);
vto = kmap_local_page(to);
copy_page(vto, vfrom);
kunmap_local(vfrom);
kunmap_local(vto);
/* Make sure this page is cleared on other CPU's too before using it */
smp_wmb();
}
int __ref page_is_ram(unsigned long pfn)
{
unsigned long addr = PFN_PHYS(pfn);
return memblock_is_memory(addr) && !memblock_is_reserved(addr);
}
#ifndef CONFIG_NUMA
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
#ifdef CONFIG_ZONE_DMA
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
free_area_init(max_zone_pfns);
}
void __init mem_init(void)
{
max_mapnr = max_low_pfn;
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
memblock_free_all();
}
#endif /* !CONFIG_NUMA */
void __ref free_initmem(void)
{
free_initmem_default(POISON_FREE_INITMEM);
}
#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)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
struct page *page = pfn_to_page(start_pfn);
/* With altmap the first mapped page is offset from @start */
if (altmap)
page += vmem_altmap_offset(altmap);
__remove_pages(start_pfn, nr_pages, altmap);
}
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 start)
{
return pa_to_nid(start);
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#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_check_pmd(pmd_t *pmd, int node,
unsigned long addr, unsigned long next)
{
int huge = pmd_val(*pmd) & _PAGE_HUGE;
if (huge)
vmemmap_verify((pte_t *)pmd, node, addr, next);
return huge;
}
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(*p4d)) {
pud = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pud)
panic("%s: Failed to allocate memory\n", __func__);
p4d_populate(&init_mm, p4d, pud);
#ifndef __PAGETABLE_PUD_FOLDED
pud_init(pud);
#endif
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pmd)
panic("%s: Failed to allocate memory\n", __func__);
pud_populate(&init_mm, pud, pmd);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_init(pmd);
#endif
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *pte;
pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate memory\n", __func__);
pmd_populate_kernel(&init_mm, pmd, 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)) {
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);
}
}
/*
* Align swapper_pg_dir in to 64K, allows its address to be loaded
* with a single LUI instruction in the TLB handlers. If we used
* __aligned(64K), its size would get rounded up to the alignment
* size, and waste space. So we place it in its own section and align
* it in the linker script.
*/
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);
#ifdef CONFIG_EXECMEM
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 /* CONFIG_EXECMEM */
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