Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / nios2 / mm / init.c

diff --git a/kernel/arch/nios2/mm/init.c b/kernel/arch/nios2/mm/init.c
new file mode 100644 (file)
index 0000000..e75c75d
--- /dev/null
+++ b/kernel/arch/nios2/mm/init.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ * Copyright (C) 2004 Microtronix Datacom Ltd
+ *
+ * based on arch/m68k/mm/init.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+#include <linux/binfmts.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+#include <asm/cpuinfo.h>
+#include <asm/processor.h>
+
+pgd_t *pgd_current;
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+       unsigned long zones_size[MAX_NR_ZONES];
+
+       memset(zones_size, 0, sizeof(zones_size));
+
+       pagetable_init();
+       pgd_current = swapper_pg_dir;
+
+       zones_size[ZONE_NORMAL] = max_mapnr;
+
+       /* pass the memory from the bootmem allocator to the main allocator */
+       free_area_init(zones_size);
+
+       flush_dcache_range((unsigned long)empty_zero_page,
+                       (unsigned long)empty_zero_page + PAGE_SIZE);
+}
+
+void __init mem_init(void)
+{
+       unsigned long end_mem   = memory_end; /* this must not include
+                                               kernel stack at top */
+
+       pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
+
+       end_mem &= PAGE_MASK;
+       high_memory = __va(end_mem);
+
+       /* this will put all memory onto the freelists */
+       free_all_bootmem();
+       mem_init_print_info(NULL);
+}
+
+void __init mmu_init(void)
+{
+       flush_tlb_all();
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+       free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+       free_initmem_default(-1);
+}
+
+#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
+static struct page *kuser_page[1];
+
+static int alloc_kuser_page(void)
+{
+       extern char __kuser_helper_start[], __kuser_helper_end[];
+       int kuser_sz = __kuser_helper_end - __kuser_helper_start;
+       unsigned long vpage;
+
+       vpage = get_zeroed_page(GFP_ATOMIC);
+       if (!vpage)
+               return -ENOMEM;
+
+       /* Copy kuser helpers */
+       memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
+
+       flush_icache_range(vpage, vpage + KUSER_SIZE);
+       kuser_page[0] = virt_to_page(vpage);
+
+       return 0;
+}
+arch_initcall(alloc_kuser_page);
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+       struct mm_struct *mm = current->mm;
+       int ret;
+
+       down_write(&mm->mmap_sem);
+
+       /* Map kuser helpers to user space address */
+       ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
+                                     VM_READ | VM_EXEC | VM_MAYREAD |
+                                     VM_MAYEXEC, kuser_page);
+
+       up_write(&mm->mmap_sem);
+
+       return ret;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+       return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
+}