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-rw-r--r--arch/ia64/mm/init.c532
1 files changed, 0 insertions, 532 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
deleted file mode 100644
index 05b0f2f0c073..000000000000
--- a/arch/ia64/mm/init.c
+++ /dev/null
@@ -1,532 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Initialize MMU support.
- *
- * Copyright (C) 1998-2003 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-
-#include <linux/dma-map-ops.h>
-#include <linux/dmar.h>
-#include <linux/efi.h>
-#include <linux/elf.h>
-#include <linux/memblock.h>
-#include <linux/mm.h>
-#include <linux/sched/signal.h>
-#include <linux/mmzone.h>
-#include <linux/module.h>
-#include <linux/personality.h>
-#include <linux/reboot.h>
-#include <linux/slab.h>
-#include <linux/swap.h>
-#include <linux/proc_fs.h>
-#include <linux/bitops.h>
-#include <linux/kexec.h>
-#include <linux/swiotlb.h>
-
-#include <asm/dma.h>
-#include <asm/efi.h>
-#include <asm/io.h>
-#include <asm/numa.h>
-#include <asm/patch.h>
-#include <asm/pgalloc.h>
-#include <asm/sal.h>
-#include <asm/sections.h>
-#include <asm/tlb.h>
-#include <linux/uaccess.h>
-#include <asm/unistd.h>
-#include <asm/mca.h>
-
-extern void ia64_tlb_init (void);
-
-unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
-
-struct page *zero_page_memmap_ptr; /* map entry for zero page */
-EXPORT_SYMBOL(zero_page_memmap_ptr);
-
-void
-__ia64_sync_icache_dcache (pte_t pte)
-{
- unsigned long addr;
- struct folio *folio;
-
- folio = page_folio(pte_page(pte));
- addr = (unsigned long)folio_address(folio);
-
- if (test_bit(PG_arch_1, &folio->flags))
- return; /* i-cache is already coherent with d-cache */
-
- flush_icache_range(addr, addr + folio_size(folio));
- set_bit(PG_arch_1, &folio->flags); /* mark page as clean */
-}
-
-/*
- * Since DMA is i-cache coherent, any (complete) folios that were written via
- * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
- * flush them when they get mapped into an executable vm-area.
- */
-void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
-{
- unsigned long pfn = PHYS_PFN(paddr);
- struct folio *folio = page_folio(pfn_to_page(pfn));
- ssize_t left = size;
- size_t offset = offset_in_folio(folio, paddr);
-
- if (offset) {
- left -= folio_size(folio) - offset;
- if (left <= 0)
- return;
- folio = folio_next(folio);
- }
-
- while (left >= (ssize_t)folio_size(folio)) {
- left -= folio_size(folio);
- set_bit(PG_arch_1, &pfn_to_page(pfn)->flags);
- if (!left)
- break;
- folio = folio_next(folio);
- }
-}
-
-inline void
-ia64_set_rbs_bot (void)
-{
- unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;
-
- if (stack_size > MAX_USER_STACK_SIZE)
- stack_size = MAX_USER_STACK_SIZE;
- current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
-}
-
-/*
- * This performs some platform-dependent address space initialization.
- * On IA-64, we want to setup the VM area for the register backing
- * store (which grows upwards) and install the gateway page which is
- * used for signal trampolines, etc.
- */
-void
-ia64_init_addr_space (void)
-{
- struct vm_area_struct *vma;
-
- ia64_set_rbs_bot();
-
- /*
- * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
- * the problem. When the process attempts to write to the register backing store
- * for the first time, it will get a SEGFAULT in this case.
- */
- vma = vm_area_alloc(current->mm);
- if (vma) {
- vma_set_anonymous(vma);
- vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
- vma->vm_end = vma->vm_start + PAGE_SIZE;
- vm_flags_init(vma, VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
- mmap_write_lock(current->mm);
- if (insert_vm_struct(current->mm, vma)) {
- mmap_write_unlock(current->mm);
- vm_area_free(vma);
- return;
- }
- mmap_write_unlock(current->mm);
- }
-
- /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
- if (!(current->personality & MMAP_PAGE_ZERO)) {
- vma = vm_area_alloc(current->mm);
- if (vma) {
- vma_set_anonymous(vma);
- vma->vm_end = PAGE_SIZE;
- vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
- vm_flags_init(vma, VM_READ | VM_MAYREAD | VM_IO |
- VM_DONTEXPAND | VM_DONTDUMP);
- mmap_write_lock(current->mm);
- if (insert_vm_struct(current->mm, vma)) {
- mmap_write_unlock(current->mm);
- vm_area_free(vma);
- return;
- }
- mmap_write_unlock(current->mm);
- }
- }
-}
-
-void
-free_initmem (void)
-{
- free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
- -1, "unused kernel");
-}
-
-void __init
-free_initrd_mem (unsigned long start, unsigned long end)
-{
- /*
- * EFI uses 4KB pages while the kernel can use 4KB or bigger.
- * Thus EFI and the kernel may have different page sizes. It is
- * therefore possible to have the initrd share the same page as
- * the end of the kernel (given current setup).
- *
- * To avoid freeing/using the wrong page (kernel sized) we:
- * - align up the beginning of initrd
- * - align down the end of initrd
- *
- * | |
- * |=============| a000
- * | |
- * | |
- * | | 9000
- * |/////////////|
- * |/////////////|
- * |=============| 8000
- * |///INITRD////|
- * |/////////////|
- * |/////////////| 7000
- * | |
- * |KKKKKKKKKKKKK|
- * |=============| 6000
- * |KKKKKKKKKKKKK|
- * |KKKKKKKKKKKKK|
- * K=kernel using 8KB pages
- *
- * In this example, we must free page 8000 ONLY. So we must align up
- * initrd_start and keep initrd_end as is.
- */
- start = PAGE_ALIGN(start);
- end = end & PAGE_MASK;
-
- if (start < end)
- printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
-
- for (; start < end; start += PAGE_SIZE) {
- if (!virt_addr_valid(start))
- continue;
- free_reserved_page(virt_to_page(start));
- }
-}
-
-/*
- * This installs a clean page in the kernel's page table.
- */
-static struct page * __init
-put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
-{
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
-
- pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */
-
- {
- p4d = p4d_alloc(&init_mm, pgd, address);
- if (!p4d)
- goto out;
- pud = pud_alloc(&init_mm, p4d, address);
- if (!pud)
- goto out;
- pmd = pmd_alloc(&init_mm, pud, address);
- if (!pmd)
- goto out;
- pte = pte_alloc_kernel(pmd, address);
- if (!pte)
- goto out;
- if (!pte_none(*pte))
- goto out;
- set_pte(pte, mk_pte(page, pgprot));
- }
- out:
- /* no need for flush_tlb */
- return page;
-}
-
-static void __init
-setup_gate (void)
-{
- struct page *page;
-
- /*
- * Map the gate page twice: once read-only to export the ELF
- * headers etc. and once execute-only page to enable
- * privilege-promotion via "epc":
- */
- page = virt_to_page(ia64_imva(__start_gate_section));
- put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
-#ifdef HAVE_BUGGY_SEGREL
- page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
- put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
-#else
- put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
- /* Fill in the holes (if any) with read-only zero pages: */
- {
- unsigned long addr;
-
- for (addr = GATE_ADDR + PAGE_SIZE;
- addr < GATE_ADDR + PERCPU_PAGE_SIZE;
- addr += PAGE_SIZE)
- {
- put_kernel_page(ZERO_PAGE(0), addr,
- PAGE_READONLY);
- put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
- PAGE_READONLY);
- }
- }
-#endif
- ia64_patch_gate();
-}
-
-static struct vm_area_struct gate_vma;
-
-static int __init gate_vma_init(void)
-{
- vma_init(&gate_vma, NULL);
- gate_vma.vm_start = FIXADDR_USER_START;
- gate_vma.vm_end = FIXADDR_USER_END;
- vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC);
- gate_vma.vm_page_prot = __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX);
-
- return 0;
-}
-__initcall(gate_vma_init);
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return &gate_vma;
-}
-
-int in_gate_area_no_mm(unsigned long addr)
-{
- if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
- return 1;
- return 0;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return in_gate_area_no_mm(addr);
-}
-
-void ia64_mmu_init(void *my_cpu_data)
-{
- unsigned long pta, impl_va_bits;
- extern void tlb_init(void);
-
-#ifdef CONFIG_DISABLE_VHPT
-# define VHPT_ENABLE_BIT 0
-#else
-# define VHPT_ENABLE_BIT 1
-#endif
-
- /*
- * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
- * address space. The IA-64 architecture guarantees that at least 50 bits of
- * virtual address space are implemented but if we pick a large enough page size
- * (e.g., 64KB), the mapped address space is big enough that it will overlap with
- * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages,
- * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
- * problem in practice. Alternatively, we could truncate the top of the mapped
- * address space to not permit mappings that would overlap with the VMLPT.
- * --davidm 00/12/06
- */
-# define pte_bits 3
-# define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
- /*
- * The virtual page table has to cover the entire implemented address space within
- * a region even though not all of this space may be mappable. The reason for
- * this is that the Access bit and Dirty bit fault handlers perform
- * non-speculative accesses to the virtual page table, so the address range of the
- * virtual page table itself needs to be covered by virtual page table.
- */
-# define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits)
-# define POW2(n) (1ULL << (n))
-
- impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
-
- if (impl_va_bits < 51 || impl_va_bits > 61)
- panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
- /*
- * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
- * which must fit into "vmlpt_bits - pte_bits" slots. Second half of
- * the test makes sure that our mapped space doesn't overlap the
- * unimplemented hole in the middle of the region.
- */
- if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
- (mapped_space_bits > impl_va_bits - 1))
- panic("Cannot build a big enough virtual-linear page table"
- " to cover mapped address space.\n"
- " Try using a smaller page size.\n");
-
-
- /* place the VMLPT at the end of each page-table mapped region: */
- pta = POW2(61) - POW2(vmlpt_bits);
-
- /*
- * Set the (virtually mapped linear) page table address. Bit
- * 8 selects between the short and long format, bits 2-7 the
- * size of the table, and bit 0 whether the VHPT walker is
- * enabled.
- */
- ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
-
- ia64_tlb_init();
-
-#ifdef CONFIG_HUGETLB_PAGE
- ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
- ia64_srlz_d();
-#endif
-}
-
-int __init register_active_ranges(u64 start, u64 len, int nid)
-{
- u64 end = start + len;
-
-#ifdef CONFIG_KEXEC
- if (start > crashk_res.start && start < crashk_res.end)
- start = crashk_res.end;
- if (end > crashk_res.start && end < crashk_res.end)
- end = crashk_res.start;
-#endif
-
- if (start < end)
- memblock_add_node(__pa(start), end - start, nid, MEMBLOCK_NONE);
- return 0;
-}
-
-int
-find_max_min_low_pfn (u64 start, u64 end, void *arg)
-{
- unsigned long pfn_start, pfn_end;
-#ifdef CONFIG_FLATMEM
- pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT;
- pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT;
-#else
- pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT;
- pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT;
-#endif
- min_low_pfn = min(min_low_pfn, pfn_start);
- max_low_pfn = max(max_low_pfn, pfn_end);
- return 0;
-}
-
-/*
- * Boot command-line option "nolwsys" can be used to disable the use of any light-weight
- * system call handler. When this option is in effect, all fsyscalls will end up bubbling
- * down into the kernel and calling the normal (heavy-weight) syscall handler. This is
- * useful for performance testing, but conceivably could also come in handy for debugging
- * purposes.
- */
-
-static int nolwsys __initdata;
-
-static int __init
-nolwsys_setup (char *s)
-{
- nolwsys = 1;
- return 1;
-}
-
-__setup("nolwsys", nolwsys_setup);
-
-void __init
-mem_init (void)
-{
- int i;
-
- BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
- BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
- BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);
-
- /*
- * This needs to be called _after_ the command line has been parsed but
- * _before_ any drivers that may need the PCI DMA interface are
- * initialized or bootmem has been freed.
- */
- do {
-#ifdef CONFIG_INTEL_IOMMU
- detect_intel_iommu();
- if (iommu_detected)
- break;
-#endif
- swiotlb_init(true, SWIOTLB_VERBOSE);
- } while (0);
-
-#ifdef CONFIG_FLATMEM
- BUG_ON(!mem_map);
-#endif
-
- set_max_mapnr(max_low_pfn);
- high_memory = __va(max_low_pfn * PAGE_SIZE);
- memblock_free_all();
-
- /*
- * For fsyscall entrypoints with no light-weight handler, use the ordinary
- * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
- * code can tell them apart.
- */
- for (i = 0; i < NR_syscalls; ++i) {
- extern unsigned long fsyscall_table[NR_syscalls];
- extern unsigned long sys_call_table[NR_syscalls];
-
- if (!fsyscall_table[i] || nolwsys)
- fsyscall_table[i] = sys_call_table[i] | 1;
- }
- setup_gate();
-}
-
-#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;
-
- if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
- return -EINVAL;
-
- ret = __add_pages(nid, start_pfn, nr_pages, params);
- if (ret)
- printk("%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;
-
- __remove_pages(start_pfn, nr_pages, altmap);
-}
-#endif
-
-static const pgprot_t protection_map[16] = {
- [VM_NONE] = PAGE_NONE,
- [VM_READ] = PAGE_READONLY,
- [VM_WRITE] = PAGE_READONLY,
- [VM_WRITE | VM_READ] = PAGE_READONLY,
- [VM_EXEC] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_X_RX),
- [VM_EXEC | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_RX),
- [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
- [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
- [VM_SHARED] = PAGE_NONE,
- [VM_SHARED | VM_READ] = PAGE_READONLY,
- [VM_SHARED | VM_WRITE] = PAGE_SHARED,
- [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
- [VM_SHARED | VM_EXEC] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_X_RX),
- [VM_SHARED | VM_EXEC | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_RX),
- [VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_RWX),
- [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
- _PAGE_AR_RWX)
-};
-DECLARE_VM_GET_PAGE_PROT