diff options
Diffstat (limited to 'arch/cris/mm')
| -rw-r--r-- | arch/cris/mm/Makefile | 6 | ||||
| -rw-r--r-- | arch/cris/mm/fault.c | 390 | ||||
| -rw-r--r-- | arch/cris/mm/init.c | 69 | ||||
| -rw-r--r-- | arch/cris/mm/ioremap.c | 90 | ||||
| -rw-r--r-- | arch/cris/mm/tlb.c | 117 |
5 files changed, 0 insertions, 672 deletions
diff --git a/arch/cris/mm/Makefile b/arch/cris/mm/Makefile deleted file mode 100644 index d3ae08c90b4e..000000000000 --- a/arch/cris/mm/Makefile +++ /dev/null @@ -1,6 +0,0 @@ -# -# Makefile for the linux cris-specific parts of the memory manager. -# - -obj-y := init.o fault.o tlb.o ioremap.o - diff --git a/arch/cris/mm/fault.c b/arch/cris/mm/fault.c deleted file mode 100644 index 29cc58038b98..000000000000 --- a/arch/cris/mm/fault.c +++ /dev/null @@ -1,390 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * arch/cris/mm/fault.c - * - * Copyright (C) 2000-2010 Axis Communications AB - */ - -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/extable.h> -#include <linux/wait.h> -#include <linux/sched/signal.h> -#include <linux/uaccess.h> -#include <arch/system.h> - -extern int find_fixup_code(struct pt_regs *); -extern void die_if_kernel(const char *, struct pt_regs *, long); -extern void show_registers(struct pt_regs *regs); - -/* debug of low-level TLB reload */ -#undef DEBUG - -#ifdef DEBUG -#define D(x) x -#else -#define D(x) -#endif - -/* debug of higher-level faults */ -#define DPG(x) - -/* current active page directory */ - -DEFINE_PER_CPU(pgd_t *, current_pgd); -unsigned long cris_signal_return_page; - -/* - * This routine handles page faults. It determines the address, - * and the problem, and then passes it off to one of the appropriate - * routines. - * - * Notice that the address we're given is aligned to the page the fault - * occurred in, since we only get the PFN in R_MMU_CAUSE not the complete - * address. - * - * error_code: - * bit 0 == 0 means no page found, 1 means protection fault - * bit 1 == 0 means read, 1 means write - * - * If this routine detects a bad access, it returns 1, otherwise it - * returns 0. - */ - -asmlinkage void -do_page_fault(unsigned long address, struct pt_regs *regs, - int protection, int writeaccess) -{ - struct task_struct *tsk; - struct mm_struct *mm; - struct vm_area_struct * vma; - siginfo_t info; - int fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; - - D(printk(KERN_DEBUG - "Page fault for %lX on %X at %lX, prot %d write %d\n", - address, smp_processor_id(), instruction_pointer(regs), - protection, writeaccess)); - - tsk = current; - - /* - * We fault-in kernel-space virtual memory on-demand. The - * 'reference' page table is init_mm.pgd. - * - * NOTE! We MUST NOT take any locks for this case. We may - * be in an interrupt or a critical region, and should - * only copy the information from the master page table, - * nothing more. - * - * NOTE2: This is done so that, when updating the vmalloc - * mappings we don't have to walk all processes pgdirs and - * add the high mappings all at once. Instead we do it as they - * are used. However vmalloc'ed page entries have the PAGE_GLOBAL - * bit set so sometimes the TLB can use a lingering entry. - * - * This verifies that the fault happens in kernel space - * and that the fault was not a protection error (error_code & 1). - */ - - if (address >= VMALLOC_START && - !protection && - !user_mode(regs)) - goto vmalloc_fault; - - /* When stack execution is not allowed we store the signal - * trampolines in the reserved cris_signal_return_page. - * Handle this in the exact same way as vmalloc (we know - * that the mapping is there and is valid so no need to - * call handle_mm_fault). - */ - if (cris_signal_return_page && - address == cris_signal_return_page && - !protection && user_mode(regs)) - goto vmalloc_fault; - - /* we can and should enable interrupts at this point */ - local_irq_enable(); - - mm = tsk->mm; - info.si_code = SEGV_MAPERR; - - /* - * If we're in an interrupt, have pagefaults disabled or have no - * user context, we must not take the fault. - */ - - if (faulthandler_disabled() || !mm) - goto no_context; - - if (user_mode(regs)) - flags |= FAULT_FLAG_USER; -retry: - down_read(&mm->mmap_sem); - vma = find_vma(mm, address); - if (!vma) - goto bad_area; - if (vma->vm_start <= address) - goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - if (user_mode(regs)) { - /* - * accessing the stack below usp is always a bug. - * we get page-aligned addresses so we can only check - * if we're within a page from usp, but that might be - * enough to catch brutal errors at least. - */ - if (address + PAGE_SIZE < rdusp()) - goto bad_area; - } - if (expand_stack(vma, address)) - goto bad_area; - - /* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ - - good_area: - info.si_code = SEGV_ACCERR; - - /* first do some preliminary protection checks */ - - if (writeaccess == 2){ - if (!(vma->vm_flags & VM_EXEC)) - goto bad_area; - } else if (writeaccess == 1) { - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - flags |= FAULT_FLAG_WRITE; - } else { - if (!(vma->vm_flags & (VM_READ | VM_EXEC))) - goto bad_area; - } - - /* - * If for any reason at all we couldn't handle the fault, - * make sure we exit gracefully rather than endlessly redo - * the fault. - */ - - fault = handle_mm_fault(vma, address, flags); - - if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) - return; - - if (unlikely(fault & VM_FAULT_ERROR)) { - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGSEGV) - goto bad_area; - else if (fault & VM_FAULT_SIGBUS) - goto do_sigbus; - BUG(); - } - - if (flags & FAULT_FLAG_ALLOW_RETRY) { - if (fault & VM_FAULT_MAJOR) - tsk->maj_flt++; - else - tsk->min_flt++; - if (fault & VM_FAULT_RETRY) { - flags &= ~FAULT_FLAG_ALLOW_RETRY; - flags |= FAULT_FLAG_TRIED; - - /* - * No need to up_read(&mm->mmap_sem) as we would - * have already released it in __lock_page_or_retry - * in mm/filemap.c. - */ - - goto retry; - } - } - - up_read(&mm->mmap_sem); - return; - - /* - * Something tried to access memory that isn't in our memory map.. - * Fix it, but check if it's kernel or user first.. - */ - - bad_area: - up_read(&mm->mmap_sem); - - bad_area_nosemaphore: - DPG(show_registers(regs)); - - /* User mode accesses just cause a SIGSEGV */ - - if (user_mode(regs)) { -#ifdef CONFIG_NO_SEGFAULT_TERMINATION - DECLARE_WAIT_QUEUE_HEAD(wq); -#endif - printk(KERN_NOTICE "%s (pid %d) segfaults for page " - "address %08lx at pc %08lx\n", - tsk->comm, tsk->pid, - address, instruction_pointer(regs)); - - /* With DPG on, we've already dumped registers above. */ - DPG(if (0)) - show_registers(regs); - -#ifdef CONFIG_NO_SEGFAULT_TERMINATION - wait_event_interruptible(wq, 0 == 1); -#else - info.si_signo = SIGSEGV; - info.si_errno = 0; - /* info.si_code has been set above */ - info.si_addr = (void *)address; - force_sig_info(SIGSEGV, &info, tsk); -#endif - return; - } - - no_context: - - /* Are we prepared to handle this kernel fault? - * - * (The kernel has valid exception-points in the source - * when it accesses user-memory. When it fails in one - * of those points, we find it in a table and do a jump - * to some fixup code that loads an appropriate error - * code) - */ - - if (find_fixup_code(regs)) - return; - - /* - * Oops. The kernel tried to access some bad page. We'll have to - * terminate things with extreme prejudice. - */ - - if (!oops_in_progress) { - oops_in_progress = 1; - if ((unsigned long) (address) < PAGE_SIZE) - printk(KERN_ALERT "Unable to handle kernel NULL " - "pointer dereference"); - else - printk(KERN_ALERT "Unable to handle kernel access" - " at virtual address %08lx\n", address); - - die_if_kernel("Oops", regs, (writeaccess << 1) | protection); - oops_in_progress = 0; - } - - do_exit(SIGKILL); - - /* - * We ran out of memory, or some other thing happened to us that made - * us unable to handle the page fault gracefully. - */ - - out_of_memory: - up_read(&mm->mmap_sem); - if (!user_mode(regs)) - goto no_context; - pagefault_out_of_memory(); - return; - - do_sigbus: - up_read(&mm->mmap_sem); - - /* - * Send a sigbus, regardless of whether we were in kernel - * or user mode. - */ - info.si_signo = SIGBUS; - info.si_errno = 0; - info.si_code = BUS_ADRERR; - info.si_addr = (void *)address; - force_sig_info(SIGBUS, &info, tsk); - - /* Kernel mode? Handle exceptions or die */ - if (!user_mode(regs)) - goto no_context; - return; - -vmalloc_fault: - { - /* - * Synchronize this task's top level page-table - * with the 'reference' page table. - * - * Use current_pgd instead of tsk->active_mm->pgd - * since the latter might be unavailable if this - * code is executed in a misfortunately run irq - * (like inside schedule() between switch_mm and - * switch_to...). - */ - - int offset = pgd_index(address); - pgd_t *pgd, *pgd_k; - pud_t *pud, *pud_k; - pmd_t *pmd, *pmd_k; - pte_t *pte_k; - - pgd = (pgd_t *)per_cpu(current_pgd, smp_processor_id()) + offset; - pgd_k = init_mm.pgd + offset; - - /* Since we're two-level, we don't need to do both - * set_pgd and set_pmd (they do the same thing). If - * we go three-level at some point, do the right thing - * with pgd_present and set_pgd here. - * - * Also, since the vmalloc area is global, we don't - * need to copy individual PTE's, it is enough to - * copy the pgd pointer into the pte page of the - * root task. If that is there, we'll find our pte if - * it exists. - */ - - pud = pud_offset(pgd, address); - pud_k = pud_offset(pgd_k, address); - if (!pud_present(*pud_k)) - goto no_context; - - pmd = pmd_offset(pud, address); - pmd_k = pmd_offset(pud_k, address); - - if (!pmd_present(*pmd_k)) - goto bad_area_nosemaphore; - - set_pmd(pmd, *pmd_k); - - /* Make sure the actual PTE exists as well to - * catch kernel vmalloc-area accesses to non-mapped - * addresses. If we don't do this, this will just - * silently loop forever. - */ - - pte_k = pte_offset_kernel(pmd_k, address); - if (!pte_present(*pte_k)) - goto no_context; - - return; - } -} - -/* Find fixup code. */ -int -find_fixup_code(struct pt_regs *regs) -{ - const struct exception_table_entry *fixup; - /* in case of delay slot fault (v32) */ - unsigned long ip = (instruction_pointer(regs) & ~0x1); - - fixup = search_exception_tables(ip); - if (fixup != 0) { - /* Adjust the instruction pointer in the stackframe. */ - instruction_pointer(regs) = fixup->fixup; - arch_fixup(regs); - return 1; - } - - return 0; -} diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c deleted file mode 100644 index e41d9c833e1c..000000000000 --- a/arch/cris/mm/init.c +++ /dev/null @@ -1,69 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/cris/mm/init.c - * - * Copyright (C) 1995 Linus Torvalds - * Copyright (C) 2000,2001 Axis Communications AB - * - * Authors: Bjorn Wesen (bjornw@axis.com) - * - */ - -#include <linux/gfp.h> -#include <linux/init.h> -#include <linux/bootmem.h> -#include <linux/proc_fs.h> -#include <linux/kcore.h> -#include <asm/tlb.h> -#include <asm/sections.h> - -unsigned long empty_zero_page; -EXPORT_SYMBOL(empty_zero_page); - -void __init mem_init(void) -{ - BUG_ON(!mem_map); - - /* max/min_low_pfn was set by setup.c - * now we just copy it to some other necessary places... - * - * high_memory was also set in setup.c - */ - max_mapnr = max_low_pfn - min_low_pfn; - free_all_bootmem(); - mem_init_print_info(NULL); -} - -/* Free a range of init pages. Virtual addresses. */ - -void free_init_pages(const char *what, unsigned long begin, unsigned long end) -{ - unsigned long addr; - - for (addr = begin; addr < end; addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - init_page_count(virt_to_page(addr)); - free_page(addr); - totalram_pages++; - } - - printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); -} - -/* Free the pages occupied by initialization code. */ - -void free_initmem(void) -{ - free_initmem_default(-1); -} - -/* Free the pages occupied by initrd code. */ - -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - free_init_pages("initrd memory", - start, - end); -} -#endif diff --git a/arch/cris/mm/ioremap.c b/arch/cris/mm/ioremap.c deleted file mode 100644 index 350bd2a86ade..000000000000 --- a/arch/cris/mm/ioremap.c +++ /dev/null @@ -1,90 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * arch/cris/mm/ioremap.c - * - * Re-map IO memory to kernel address space so that we can access it. - * Needed for memory-mapped I/O devices mapped outside our normal DRAM - * window (that is, all memory-mapped I/O devices). - * - * (C) Copyright 1995 1996 Linus Torvalds - * CRIS-port by Axis Communications AB - */ - -#include <linux/vmalloc.h> -#include <linux/io.h> -#include <asm/pgalloc.h> -#include <arch/memmap.h> - -/* - * Generic mapping function (not visible outside): - */ - -/* - * Remap an arbitrary physical address space into the kernel virtual - * address space. Needed when the kernel wants to access high addresses - * directly. - * - * NOTE! We need to allow non-page-aligned mappings too: we will obviously - * have to convert them into an offset in a page-aligned mapping, but the - * caller shouldn't need to know that small detail. - */ -void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot) -{ - void __iomem * addr; - struct vm_struct * area; - unsigned long offset, last_addr; - - /* Don't allow wraparound or zero size */ - last_addr = phys_addr + size - 1; - if (!size || last_addr < phys_addr) - return NULL; - - /* - * Mappings have to be page-aligned - */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr+1) - phys_addr; - - /* - * Ok, go for it.. - */ - area = get_vm_area(size, VM_IOREMAP); - if (!area) - return NULL; - addr = (void __iomem *)area->addr; - if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, - phys_addr, prot)) { - vfree((void __force *)addr); - return NULL; - } - return (void __iomem *) (offset + (char __iomem *)addr); -} - -void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) -{ - return __ioremap_prot(phys_addr, size, - __pgprot(_PAGE_PRESENT | __READABLE | - __WRITEABLE | _PAGE_GLOBAL | - _PAGE_KERNEL | flags)); -} - -/** - * ioremap_nocache - map bus memory into CPU space - * @offset: bus address of the memory - * @size: size of the resource to map - * - * Must be freed with iounmap. - */ - -void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size) -{ - return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0); -} -EXPORT_SYMBOL(ioremap_nocache); - -void iounmap(volatile void __iomem *addr) -{ - if (addr > high_memory) - return vfree((void *) (PAGE_MASK & (unsigned long) addr)); -} diff --git a/arch/cris/mm/tlb.c b/arch/cris/mm/tlb.c deleted file mode 100644 index e0dbea62cb81..000000000000 --- a/arch/cris/mm/tlb.c +++ /dev/null @@ -1,117 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/cris/mm/tlb.c - * - * Copyright (C) 2000, 2001 Axis Communications AB - * - * Authors: Bjorn Wesen (bjornw@axis.com) - * - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/mm_types.h> - -#include <asm/tlb.h> - -#define D(x) - -/* The TLB can host up to 64 different mm contexts at the same time. - * The running context is R_MMU_CONTEXT, and each TLB entry contains a - * page_id that has to match to give a hit. In page_id_map, we keep track - * of which mm we have assigned to which page_id, so that we know when - * to invalidate TLB entries. - * - * The last page_id is never running - it is used as an invalid page_id - * so we can make TLB entries that will never match. - * - * Notice that we need to make the flushes atomic, otherwise an interrupt - * handler that uses vmalloced memory might cause a TLB load in the middle - * of a flush causing. - */ - -struct mm_struct *page_id_map[NUM_PAGEID]; -static int map_replace_ptr = 1; /* which page_id_map entry to replace next */ - -/* the following functions are similar to those used in the PPC port */ - -static inline void -alloc_context(struct mm_struct *mm) -{ - struct mm_struct *old_mm; - - D(printk("tlb: alloc context %d (%p)\n", map_replace_ptr, mm)); - - /* did we replace an mm ? */ - - old_mm = page_id_map[map_replace_ptr]; - - if(old_mm) { - /* throw out any TLB entries belonging to the mm we replace - * in the map - */ - flush_tlb_mm(old_mm); - - old_mm->context.page_id = NO_CONTEXT; - } - - /* insert it into the page_id_map */ - - mm->context.page_id = map_replace_ptr; - page_id_map[map_replace_ptr] = mm; - - map_replace_ptr++; - - if(map_replace_ptr == INVALID_PAGEID) - map_replace_ptr = 0; /* wrap around */ -} - -/* - * if needed, get a new MMU context for the mm. otherwise nothing is done. - */ - -void -get_mmu_context(struct mm_struct *mm) -{ - if(mm->context.page_id == NO_CONTEXT) - alloc_context(mm); -} - -/* called by __exit_mm to destroy the used MMU context if any before - * destroying the mm itself. this is only called when the last user of the mm - * drops it. - * - * the only thing we really need to do here is mark the used PID slot - * as empty. - */ - -void -destroy_context(struct mm_struct *mm) -{ - if(mm->context.page_id != NO_CONTEXT) { - D(printk("destroy_context %d (%p)\n", mm->context.page_id, mm)); - flush_tlb_mm(mm); /* TODO this might be redundant ? */ - page_id_map[mm->context.page_id] = NULL; - } -} - -/* called once during VM initialization, from init.c */ - -void __init -tlb_init(void) -{ - int i; - - /* clear the page_id map */ - - for (i = 1; i < ARRAY_SIZE(page_id_map); i++) - page_id_map[i] = NULL; - - /* invalidate the entire TLB */ - - flush_tlb_all(); - - /* the init_mm has context 0 from the boot */ - - page_id_map[0] = &init_mm; -} |