diff options
Diffstat (limited to 'arch/ia64/mm/init.c')
| -rw-r--r-- | arch/ia64/mm/init.c | 492 |
1 files changed, 0 insertions, 492 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c deleted file mode 100644 index 855d949d81df..000000000000 --- a/arch/ia64/mm/init.c +++ /dev/null @@ -1,492 +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 page *page; - - page = pte_page(pte); - addr = (unsigned long) page_address(page); - - if (test_bit(PG_arch_1, &page->flags)) - return; /* i-cache is already coherent with d-cache */ - - flush_icache_range(addr, addr + page_size(page)); - set_bit(PG_arch_1, &page->flags); /* mark page as clean */ -} - -/* - * Since DMA is i-cache coherent, any (complete) pages 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); - - do { - set_bit(PG_arch_1, &pfn_to_page(pfn)->flags); - } while (++pfn <= PHYS_PFN(paddr + size - 1)); -} - -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; - vma->vm_flags = 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); - vma->vm_flags = 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; - gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; - gate_vma.vm_page_prot = __P101; - - 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 |