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-rw-r--r--arch/loongarch/mm/init.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
new file mode 100644
index 000000000..f42a3be5f
--- /dev/null
+++ b/arch/loongarch/mm/init.c
@@ -0,0 +1,238 @@
+// 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/initrd.h>
+#include <linux/mmzone.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>
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right colour
+ * when needed. Since page is never written to after the initialization we
+ * don't have to care about aliases on other CPUs.
+ */
+unsigned long empty_zero_page, zero_page_mask;
+EXPORT_SYMBOL(empty_zero_page);
+EXPORT_SYMBOL(zero_page_mask);
+
+void setup_zero_pages(void)
+{
+ unsigned int order, i;
+ struct page *page;
+
+ order = 0;
+
+ empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!empty_zero_page)
+ panic("Oh boy, that early out of memory?");
+
+ page = virt_to_page((void *)empty_zero_page);
+ split_page(page, order);
+ for (i = 0; i < (1 << order); i++, page++)
+ mark_page_reserved(page);
+
+ zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
+}
+
+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();
+ setup_zero_pages(); /* Setup zeroed pages. */
+}
+#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
+
+static pte_t *fixmap_pte(unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset_k(addr);
+ p4d = p4d_offset(pgd, addr);
+
+ if (pgd_none(*pgd)) {
+ pud_t *new __maybe_unused;
+
+ new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ pgd_populate(&init_mm, pgd, new);
+#ifndef __PAGETABLE_PUD_FOLDED
+ pud_init((unsigned long)new, (unsigned long)invalid_pmd_table);
+#endif
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ pmd_t *new __maybe_unused;
+
+ new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ pud_populate(&init_mm, pud, new);
+#ifndef __PAGETABLE_PMD_FOLDED
+ pmd_init((unsigned long)new, (unsigned long)invalid_pte_table);
+#endif
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ pte_t *new __maybe_unused;
+
+ new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pmd, new);
+ }
+
+ 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 = fixmap_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);