diff options
Diffstat (limited to 'arch/ia64/mm/init.c')
| -rw-r--r-- | arch/ia64/mm/init.c | 518 |
1 files changed, 518 insertions, 0 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c new file mode 100644 index 000000000..fc4e4217e --- /dev/null +++ b/arch/ia64/mm/init.c @@ -0,0 +1,518 @@ +// 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 = __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 |