File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
new file mode 100644
index 0000000..904f3eb
--- /dev/null
+++ b/arch/um/include/asm/Kbuild
@@ -0,0 +1,29 @@
+generic-y += barrier.h
+generic-y += bug.h
+generic-y += clkdev.h
+generic-y += cputime.h
+generic-y += current.h
+generic-y += delay.h
+generic-y += device.h
+generic-y += emergency-restart.h
+generic-y += exec.h
+generic-y += ftrace.h
+generic-y += futex.h
+generic-y += hardirq.h
+generic-y += hw_irq.h
+generic-y += io.h
+generic-y += irq_regs.h
+generic-y += irq_work.h
+generic-y += kdebug.h
+generic-y += mcs_spinlock.h
+generic-y += mm-arch-hooks.h
+generic-y += mutex.h
+generic-y += param.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += preempt.h
+generic-y += switch_to.h
+generic-y += topology.h
+generic-y += trace_clock.h
+generic-y += word-at-a-time.h
+generic-y += xor.h
diff --git a/arch/um/include/asm/a.out-core.h b/arch/um/include/asm/a.out-core.h
new file mode 100644
index 0000000..995643b
--- /dev/null
+++ b/arch/um/include/asm/a.out-core.h
@@ -0,0 +1,27 @@
+/* a.out coredump register dumper
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef __UM_A_OUT_CORE_H
+#define __UM_A_OUT_CORE_H
+
+#ifdef __KERNEL__
+
+#include <linux/user.h>
+
+/*
+ * fill in the user structure for an a.out core dump
+ */
+static inline void aout_dump_thread(struct pt_regs *regs, struct user *u)
+{
+}
+
+#endif /* __KERNEL__ */
+#endif /* __UM_A_OUT_CORE_H */
diff --git a/arch/um/include/asm/bugs.h b/arch/um/include/asm/bugs.h
new file mode 100644
index 0000000..6a72e24
--- /dev/null
+++ b/arch/um/include/asm/bugs.h
@@ -0,0 +1,6 @@
+#ifndef __UM_BUGS_H
+#define __UM_BUGS_H
+
+void check_bugs(void);
+
+#endif
diff --git a/arch/um/include/asm/cache.h b/arch/um/include/asm/cache.h
new file mode 100644
index 0000000..19e1bdd
--- /dev/null
+++ b/arch/um/include/asm/cache.h
@@ -0,0 +1,17 @@
+#ifndef __UM_CACHE_H
+#define __UM_CACHE_H
+
+
+#if defined(CONFIG_UML_X86) && !defined(CONFIG_64BIT)
+# define L1_CACHE_SHIFT (CONFIG_X86_L1_CACHE_SHIFT)
+#elif defined(CONFIG_UML_X86) /* 64-bit */
+# define L1_CACHE_SHIFT 6 /* Should be 7 on Intel */
+#else
+/* XXX: this was taken from x86, now it's completely random. Luckily only
+ * affects SMP padding. */
+# define L1_CACHE_SHIFT 5
+#endif
+
+#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
+
+#endif
diff --git a/arch/um/include/asm/common.lds.S b/arch/um/include/asm/common.lds.S
new file mode 100644
index 0000000..1330553
--- /dev/null
+++ b/arch/um/include/asm/common.lds.S
@@ -0,0 +1,107 @@
+#include <asm-generic/vmlinux.lds.h>
+
+ .fini : { *(.fini) } =0x9090
+ _etext = .;
+ PROVIDE (etext = .);
+
+ . = ALIGN(4096);
+ _sdata = .;
+ PROVIDE (sdata = .);
+
+ RODATA
+
+ .unprotected : { *(.unprotected) }
+ . = ALIGN(4096);
+ PROVIDE (_unprotected_end = .);
+
+ . = ALIGN(4096);
+ .note : { *(.note.*) }
+ EXCEPTION_TABLE(0)
+
+ BUG_TABLE
+
+ .uml.setup.init : {
+ __uml_setup_start = .;
+ *(.uml.setup.init)
+ __uml_setup_end = .;
+ }
+
+ .uml.help.init : {
+ __uml_help_start = .;
+ *(.uml.help.init)
+ __uml_help_end = .;
+ }
+
+ .uml.postsetup.init : {
+ __uml_postsetup_start = .;
+ *(.uml.postsetup.init)
+ __uml_postsetup_end = .;
+ }
+
+ .init.setup : {
+ INIT_SETUP(0)
+ }
+
+ PERCPU_SECTION(32)
+
+ .initcall.init : {
+ INIT_CALLS
+ }
+
+ .con_initcall.init : {
+ CON_INITCALL
+ }
+
+ .uml.initcall.init : {
+ __uml_initcall_start = .;
+ *(.uml.initcall.init)
+ __uml_initcall_end = .;
+ }
+
+ SECURITY_INIT
+
+ .exitcall : {
+ __exitcall_begin = .;
+ *(.exitcall.exit)
+ __exitcall_end = .;
+ }
+
+ .uml.exitcall : {
+ __uml_exitcall_begin = .;
+ *(.uml.exitcall.exit)
+ __uml_exitcall_end = .;
+ }
+
+ . = ALIGN(4);
+ .altinstructions : {
+ __alt_instructions = .;
+ *(.altinstructions)
+ __alt_instructions_end = .;
+ }
+ .altinstr_replacement : { *(.altinstr_replacement) }
+ /* .exit.text is discard at runtime, not link time, to deal with references
+ from .altinstructions and .eh_frame */
+ .exit.text : { EXIT_TEXT }
+ .exit.data : { *(.exit.data) }
+
+ .preinit_array : {
+ __preinit_array_start = .;
+ *(.preinit_array)
+ __preinit_array_end = .;
+ }
+ .init_array : {
+ __init_array_start = .;
+ *(.init_array)
+ __init_array_end = .;
+ }
+ .fini_array : {
+ __fini_array_start = .;
+ *(.fini_array)
+ __fini_array_end = .;
+ }
+
+ . = ALIGN(4096);
+ .init.ramfs : {
+ INIT_RAM_FS
+ }
+
diff --git a/arch/um/include/asm/dma.h b/arch/um/include/asm/dma.h
new file mode 100644
index 0000000..f88c586
--- /dev/null
+++ b/arch/um/include/asm/dma.h
@@ -0,0 +1,10 @@
+#ifndef __UM_DMA_H
+#define __UM_DMA_H
+
+#include <asm/io.h>
+
+extern unsigned long uml_physmem;
+
+#define MAX_DMA_ADDRESS (uml_physmem)
+
+#endif
diff --git a/arch/um/include/asm/fixmap.h b/arch/um/include/asm/fixmap.h
new file mode 100644
index 0000000..1761fd7
--- /dev/null
+++ b/arch/um/include/asm/fixmap.h
@@ -0,0 +1,56 @@
+#ifndef __UM_FIXMAP_H
+#define __UM_FIXMAP_H
+
+#include <asm/processor.h>
+#include <asm/kmap_types.h>
+#include <asm/archparam.h>
+#include <asm/page.h>
+#include <linux/threads.h>
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process. We allocate these special addresses
+ * from the end of virtual memory (0xfffff000) backwards.
+ * Also this lets us do fail-safe vmalloc(), we
+ * can guarantee that these special addresses and
+ * vmalloc()-ed addresses never overlap.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * highger than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ * TLB entries of such buffers will not be flushed across
+ * task switches.
+ */
+
+/*
+ * on UP currently we will have no trace of the fixmap mechanizm,
+ * no page table allocations, etc. This might change in the
+ * future, say framebuffers for the console driver(s) could be
+ * fix-mapped?
+ */
+enum fixed_addresses {
+ __end_of_fixed_addresses
+};
+
+extern void __set_fixmap (enum fixed_addresses idx,
+ unsigned long phys, pgprot_t flags);
+
+/*
+ * used by vmalloc.c.
+ *
+ * Leave one empty page between vmalloc'ed areas and
+ * the start of the fixmap, and leave one page empty
+ * at the top of mem..
+ */
+
+#define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE)
+#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
+
+#include <asm-generic/fixmap.h>
+
+#endif
diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
new file mode 100644
index 0000000..4a2037f
--- /dev/null
+++ b/arch/um/include/asm/irq.h
@@ -0,0 +1,23 @@
+#ifndef __UM_IRQ_H
+#define __UM_IRQ_H
+
+#define TIMER_IRQ 0
+#define UMN_IRQ 1
+#define CONSOLE_IRQ 2
+#define CONSOLE_WRITE_IRQ 3
+#define UBD_IRQ 4
+#define UM_ETH_IRQ 5
+#define SSL_IRQ 6
+#define SSL_WRITE_IRQ 7
+#define ACCEPT_IRQ 8
+#define MCONSOLE_IRQ 9
+#define WINCH_IRQ 10
+#define SIGIO_WRITE_IRQ 11
+#define TELNETD_IRQ 12
+#define XTERM_IRQ 13
+#define RANDOM_IRQ 14
+
+#define LAST_IRQ RANDOM_IRQ
+#define NR_IRQS (LAST_IRQ + 1)
+
+#endif
diff --git a/arch/um/include/asm/irqflags.h b/arch/um/include/asm/irqflags.h
new file mode 100644
index 0000000..c780d8a
--- /dev/null
+++ b/arch/um/include/asm/irqflags.h
@@ -0,0 +1,42 @@
+#ifndef __UM_IRQFLAGS_H
+#define __UM_IRQFLAGS_H
+
+extern int get_signals(void);
+extern int set_signals(int enable);
+extern void block_signals(void);
+extern void unblock_signals(void);
+
+static inline unsigned long arch_local_save_flags(void)
+{
+ return get_signals();
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+ set_signals(flags);
+}
+
+static inline void arch_local_irq_enable(void)
+{
+ unblock_signals();
+}
+
+static inline void arch_local_irq_disable(void)
+{
+ block_signals();
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+ unsigned long flags;
+ flags = arch_local_save_flags();
+ arch_local_irq_disable();
+ return flags;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+ return arch_local_save_flags() == 0;
+}
+
+#endif
diff --git a/arch/um/include/asm/kmap_types.h b/arch/um/include/asm/kmap_types.h
new file mode 100644
index 0000000..2e0a6b1
--- /dev/null
+++ b/arch/um/include/asm/kmap_types.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_KMAP_TYPES_H
+#define __UM_KMAP_TYPES_H
+
+/* No more #include "asm/arch/kmap_types.h" ! */
+
+#define KM_TYPE_NR 14
+
+#endif
diff --git a/arch/um/include/asm/kvm_para.h b/arch/um/include/asm/kvm_para.h
new file mode 100644
index 0000000..14fab8f
--- /dev/null
+++ b/arch/um/include/asm/kvm_para.h
@@ -0,0 +1 @@
+#include <asm-generic/kvm_para.h>
diff --git a/arch/um/include/asm/mmu.h b/arch/um/include/asm/mmu.h
new file mode 100644
index 0000000..da70544
--- /dev/null
+++ b/arch/um/include/asm/mmu.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __ARCH_UM_MMU_H
+#define __ARCH_UM_MMU_H
+
+#include <mm_id.h>
+#include <asm/mm_context.h>
+
+typedef struct mm_context {
+ struct mm_id id;
+ struct uml_arch_mm_context arch;
+ struct page *stub_pages[2];
+} mm_context_t;
+
+extern void __switch_mm(struct mm_id * mm_idp);
+
+/* Avoid tangled inclusion with asm/ldt.h */
+extern long init_new_ldt(struct mm_context *to_mm, struct mm_context *from_mm);
+extern void free_ldt(struct mm_context *mm);
+
+#endif
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
new file mode 100644
index 0000000..941527e
--- /dev/null
+++ b/arch/um/include/asm/mmu_context.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_MMU_CONTEXT_H
+#define __UM_MMU_CONTEXT_H
+
+#include <linux/sched.h>
+#include <asm/mmu.h>
+
+extern void uml_setup_stubs(struct mm_struct *mm);
+/*
+ * Needed since we do not use the asm-generic/mm_hooks.h:
+ */
+static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
+{
+ uml_setup_stubs(mm);
+}
+extern void arch_exit_mmap(struct mm_struct *mm);
+static inline void arch_unmap(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+}
+static inline void arch_bprm_mm_init(struct mm_struct *mm,
+ struct vm_area_struct *vma)
+{
+}
+/*
+ * end asm-generic/mm_hooks.h functions
+ */
+
+#define deactivate_mm(tsk,mm) do { } while (0)
+
+extern void force_flush_all(void);
+
+static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
+{
+ /*
+ * This is called by fs/exec.c and sys_unshare()
+ * when the new ->mm is used for the first time.
+ */
+ __switch_mm(&new->context.id);
+ down_write(&new->mmap_sem);
+ uml_setup_stubs(new);
+ up_write(&new->mmap_sem);
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ unsigned cpu = smp_processor_id();
+
+ if(prev != next){
+ cpumask_clear_cpu(cpu, mm_cpumask(prev));
+ cpumask_set_cpu(cpu, mm_cpumask(next));
+ if(next != &init_mm)
+ __switch_mm(&next->context.id);
+ }
+}
+
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+ struct task_struct *tsk)
+{
+}
+
+extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
+
+extern void destroy_context(struct mm_struct *mm);
+
+#endif
diff --git a/arch/um/include/asm/page.h b/arch/um/include/asm/page.h
new file mode 100644
index 0000000..71c5d13
--- /dev/null
+++ b/arch/um/include/asm/page.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PAGE_H
+#define __UM_PAGE_H
+
+#include <linux/const.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT 12
+#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK (~(PAGE_SIZE-1))
+
+#ifndef __ASSEMBLY__
+
+struct page;
+
+#include <linux/types.h>
+#include <asm/vm-flags.h>
+
+/*
+ * These are used to make use of C type-checking..
+ */
+
+#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
+
+#define clear_user_page(page, vaddr, pg) clear_page(page)
+#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
+
+#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
+
+typedef struct { unsigned long pte_low, pte_high; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
+
+#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
+#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
+#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
+#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
+ smp_wmb(); \
+ (to).pte_low = (from).pte_low; })
+#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
+#define pte_set_val(pte, phys, prot) \
+ ({ (pte).pte_high = (phys) >> 32; \
+ (pte).pte_low = (phys) | pgprot_val(prot); })
+
+#define pmd_val(x) ((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+
+typedef unsigned long long pfn_t;
+typedef unsigned long long phys_t;
+
+#else
+
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pgd; } pgd_t;
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+typedef struct { unsigned long pmd; } pmd_t;
+#define pmd_val(x) ((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+#endif
+
+#define pte_val(x) ((x).pte)
+
+
+#define pte_get_bits(p, bits) ((p).pte & (bits))
+#define pte_set_bits(p, bits) ((p).pte |= (bits))
+#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
+#define pte_copy(to, from) ((to).pte = (from).pte)
+#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
+#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
+
+typedef unsigned long pfn_t;
+typedef unsigned long phys_t;
+
+#endif
+
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+typedef struct page *pgtable_t;
+
+#define pgd_val(x) ((x).pgd)
+#define pgprot_val(x) ((x).pgprot)
+
+#define __pte(x) ((pte_t) { (x) } )
+#define __pgd(x) ((pgd_t) { (x) } )
+#define __pgprot(x) ((pgprot_t) { (x) } )
+
+extern unsigned long uml_physmem;
+
+#define PAGE_OFFSET (uml_physmem)
+#define KERNELBASE PAGE_OFFSET
+
+#define __va_space (8*1024*1024)
+
+#include <mem.h>
+
+/* Cast to unsigned long before casting to void * to avoid a warning from
+ * mmap_kmem about cutting a long long down to a void *. Not sure that
+ * casting is the right thing, but 32-bit UML can't have 64-bit virtual
+ * addresses
+ */
+#define __pa(virt) to_phys((void *) (unsigned long) (virt))
+#define __va(phys) to_virt((unsigned long) (phys))
+
+#define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
+#define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
+
+#define pfn_valid(pfn) ((pfn) < max_mapnr)
+#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_X86_32
+#define __HAVE_ARCH_GATE_AREA 1
+#endif
+
+#endif /* __UM_PAGE_H */
diff --git a/arch/um/include/asm/pgalloc.h b/arch/um/include/asm/pgalloc.h
new file mode 100644
index 0000000..bf90b2a
--- /dev/null
+++ b/arch/um/include/asm/pgalloc.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgalloc.h and include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGALLOC_H
+#define __UM_PGALLOC_H
+
+#include <linux/mm.h>
+
+#define pmd_populate_kernel(mm, pmd, pte) \
+ set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) __pa(pte)))
+
+#define pmd_populate(mm, pmd, pte) \
+ set_pmd(pmd, __pmd(_PAGE_TABLE + \
+ ((unsigned long long)page_to_pfn(pte) << \
+ (unsigned long long) PAGE_SHIFT)))
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+/*
+ * Allocate and free page tables.
+ */
+extern pgd_t *pgd_alloc(struct mm_struct *);
+extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
+
+extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
+extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+ free_page((unsigned long) pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+ pgtable_page_dtor(pte);
+ __free_page(pte);
+}
+
+#define __pte_free_tlb(tlb,pte, address) \
+do { \
+ pgtable_page_dtor(pte); \
+ tlb_remove_page((tlb),(pte)); \
+} while (0)
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+ free_page((unsigned long)pmd);
+}
+
+#define __pmd_free_tlb(tlb,x, address) tlb_remove_page((tlb),virt_to_page(x))
+#endif
+
+#define check_pgt_cache() do { } while (0)
+
+#endif
+
diff --git a/arch/um/include/asm/pgtable-2level.h b/arch/um/include/asm/pgtable-2level.h
new file mode 100644
index 0000000..cfbe597
--- /dev/null
+++ b/arch/um/include/asm/pgtable-2level.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_2LEVEL_H
+#define __UM_PGTABLE_2LEVEL_H
+
+#include <asm-generic/pgtable-nopmd.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#define PGDIR_SHIFT 22
+#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK (~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: the i386 is two-level, so
+ * we don't really have any PMD directory physically.
+ */
+#define PTRS_PER_PTE 1024
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define PTRS_PER_PGD 1024
+#define FIRST_USER_ADDRESS 0UL
+
+#define pte_ERROR(e) \
+ printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+ pte_val(e))
+#define pgd_ERROR(e) \
+ printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+ pgd_val(e))
+
+static inline int pgd_newpage(pgd_t pgd) { return 0; }
+static inline void pgd_mkuptodate(pgd_t pgd) { }
+
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+
+#define pte_pfn(x) phys_to_pfn(pte_val(x))
+#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
+
+#endif
diff --git a/arch/um/include/asm/pgtable-3level.h b/arch/um/include/asm/pgtable-3level.h
new file mode 100644
index 0000000..2b4274e
--- /dev/null
+++ b/arch/um/include/asm/pgtable-3level.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2003 PathScale Inc
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_3LEVEL_H
+#define __UM_PGTABLE_3LEVEL_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#ifdef CONFIG_64BIT
+#define PGDIR_SHIFT 30
+#else
+#define PGDIR_SHIFT 31
+#endif
+#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK (~(PGDIR_SIZE-1))
+
+/* PMD_SHIFT determines the size of the area a second-level page table can
+ * map
+ */
+
+#define PMD_SHIFT 21
+#define PMD_SIZE (1UL << PMD_SHIFT)
+#define PMD_MASK (~(PMD_SIZE-1))
+
+/*
+ * entries per page directory level
+ */
+
+#define PTRS_PER_PTE 512
+#ifdef CONFIG_64BIT
+#define PTRS_PER_PMD 512
+#define PTRS_PER_PGD 512
+#else
+#define PTRS_PER_PMD 1024
+#define PTRS_PER_PGD 1024
+#endif
+
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define FIRST_USER_ADDRESS 0UL
+
+#define pte_ERROR(e) \
+ printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pte_val(e))
+#define pmd_ERROR(e) \
+ printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pmd_val(e))
+#define pgd_ERROR(e) \
+ printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pgd_val(e))
+
+#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
+#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
+#define pud_populate(mm, pud, pmd) \
+ set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
+
+#ifdef CONFIG_64BIT
+#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
+#else
+#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
+#endif
+
+static inline int pgd_newpage(pgd_t pgd)
+{
+ return(pgd_val(pgd) & _PAGE_NEWPAGE);
+}
+
+static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
+
+#ifdef CONFIG_64BIT
+#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
+#else
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#endif
+
+struct mm_struct;
+extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
+
+static inline void pud_clear (pud_t *pud)
+{
+ set_pud(pud, __pud(_PAGE_NEWPAGE));
+}
+
+#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
+#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
+ pmd_index(address))
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+ return phys_to_pfn(pte_val(pte));
+}
+
+static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
+{
+ pte_t pte;
+ phys_t phys = pfn_to_phys(page_nr);
+
+ pte_set_val(pte, phys, pgprot);
+ return pte;
+}
+
+static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
+{
+ return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
+}
+
+#endif
+
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
new file mode 100644
index 0000000..18eb992
--- /dev/null
+++ b/arch/um/include/asm/pgtable.h
@@ -0,0 +1,362 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_H
+#define __UM_PGTABLE_H
+
+#include <asm/fixmap.h>
+
+#define _PAGE_PRESENT 0x001
+#define _PAGE_NEWPAGE 0x002
+#define _PAGE_NEWPROT 0x004
+#define _PAGE_RW 0x020
+#define _PAGE_USER 0x040
+#define _PAGE_ACCESSED 0x080
+#define _PAGE_DIRTY 0x100
+/* If _PAGE_PRESENT is clear, we use these: */
+#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
+ pte_present gives true */
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+#include <asm/pgtable-3level.h>
+#else
+#include <asm/pgtable-2level.h>
+#endif
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/* zero page used for uninitialized stuff */
+extern unsigned long *empty_zero_page;
+
+#define pgtable_cache_init() do ; while (0)
+
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts. That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+
+extern unsigned long end_iomem;
+
+#define VMALLOC_OFFSET (__va_space)
+#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
+#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
+#define MODULES_VADDR VMALLOC_START
+#define MODULES_END VMALLOC_END
+#define MODULES_LEN (MODULES_VADDR - MODULES_END)
+
+#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define __PAGE_KERNEL_EXEC \
+ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
+
+/*
+ * The i386 can't do page protection for execute, and considers that the same
+ * are read.
+ * Also, write permissions imply read permissions. This is the closest we can
+ * get..
+ */
+#define __P000 PAGE_NONE
+#define __P001 PAGE_READONLY
+#define __P010 PAGE_COPY
+#define __P011 PAGE_COPY
+#define __P100 PAGE_READONLY
+#define __P101 PAGE_READONLY
+#define __P110 PAGE_COPY
+#define __P111 PAGE_COPY
+
+#define __S000 PAGE_NONE
+#define __S001 PAGE_READONLY
+#define __S010 PAGE_SHARED
+#define __S011 PAGE_SHARED
+#define __S100 PAGE_READONLY
+#define __S101 PAGE_READONLY
+#define __S110 PAGE_SHARED
+#define __S111 PAGE_SHARED
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
+
+#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+
+#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
+#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+
+#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+/*
+ * =================================
+ * Flags checking section.
+ * =================================
+ */
+
+static inline int pte_none(pte_t pte)
+{
+ return pte_is_zero(pte);
+}
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_read(pte_t pte)
+{
+ return((pte_get_bits(pte, _PAGE_USER)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_exec(pte_t pte){
+ return((pte_get_bits(pte, _PAGE_USER)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_write(pte_t pte)
+{
+ return((pte_get_bits(pte, _PAGE_RW)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_DIRTY);
+}
+
+static inline int pte_young(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_ACCESSED);
+}
+
+static inline int pte_newpage(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_NEWPAGE);
+}
+
+static inline int pte_newprot(pte_t pte)
+{
+ return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
+}
+
+static inline int pte_special(pte_t pte)
+{
+ return 0;
+}
+
+/*
+ * =================================
+ * Flags setting section.
+ * =================================
+ */
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_NEWPROT);
+ return(pte);
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_DIRTY);
+ return(pte);
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_ACCESSED);
+ return(pte);
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_RW);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkread(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_USER);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_DIRTY);
+ return(pte);
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_ACCESSED);
+ return(pte);
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_RW);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkuptodate(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_NEWPAGE);
+ if(pte_present(pte))
+ pte_clear_bits(pte, _PAGE_NEWPROT);
+ return(pte);
+}
+
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_NEWPAGE);
+ return(pte);
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+ pte_copy(*pteptr, pteval);
+
+ /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
+ * fix_range knows to unmap it. _PAGE_NEWPROT is specific to
+ * mapped pages.
+ */
+
+ *pteptr = pte_mknewpage(*pteptr);
+ if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t pte_a, pte_t pte_b)
+{
+ return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
+}
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+
+#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
+#define __virt_to_page(virt) phys_to_page(__pa(virt))
+#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
+#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
+
+#define mk_pte(page, pgprot) \
+ ({ pte_t pte; \
+ \
+ pte_set_val(pte, page_to_phys(page), (pgprot)); \
+ if (pte_present(pte)) \
+ pte_mknewprot(pte_mknewpage(pte)); \
+ pte;})
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+ pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
+ return pte;
+}
+
+/*
+ * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
+ *
+ * this macro returns the index of the entry in the pgd page which would
+ * control the given virtual address
+ */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+
+/*
+ * pgd_offset() returns a (pgd_t *)
+ * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
+ */
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/*
+ * a shortcut which implies the use of the kernel's pgd, instead
+ * of a process's
+ */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/*
+ * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
+ *
+ * this macro returns the index of the entry in the pmd page which would
+ * control the given virtual address
+ */
+#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+#define pmd_page_vaddr(pmd) \
+ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+/*
+ * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
+ *
+ * this macro returns the index of the entry in the pte page which would
+ * control the given virtual address
+ */
+#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address) \
+ ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
+#define pte_offset_map(dir, address) \
+ ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_unmap(pte) do { } while (0)
+
+struct mm_struct;
+extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
+
+#define update_mmu_cache(vma,address,ptep) do ; while (0)
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x) (((x).val >> 5) & 0x1f)
+#define __swp_offset(x) ((x).val >> 11)
+
+#define __swp_entry(type, offset) \
+ ((swp_entry_t) { ((type) << 5) | ((offset) << 11) })
+#define __pte_to_swp_entry(pte) \
+ ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
+#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
+
+#define kern_addr_valid(addr) (1)
+
+#include <asm-generic/pgtable.h>
+
+/* Clear a kernel PTE and flush it from the TLB */
+#define kpte_clear_flush(ptep, vaddr) \
+do { \
+ pte_clear(&init_mm, (vaddr), (ptep)); \
+ __flush_tlb_one((vaddr)); \
+} while (0)
+
+#endif
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
new file mode 100644
index 0000000..2d1e0dd
--- /dev/null
+++ b/arch/um/include/asm/processor-generic.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PROCESSOR_GENERIC_H
+#define __UM_PROCESSOR_GENERIC_H
+
+struct pt_regs;
+
+struct task_struct;
+
+#include <asm/ptrace.h>
+#include <registers.h>
+#include <sysdep/archsetjmp.h>
+
+#include <linux/prefetch.h>
+
+struct mm_struct;
+
+struct thread_struct {
+ struct pt_regs regs;
+ struct pt_regs *segv_regs;
+ int singlestep_syscall;
+ void *fault_addr;
+ jmp_buf *fault_catcher;
+ struct task_struct *prev_sched;
+ struct arch_thread arch;
+ jmp_buf switch_buf;
+ struct {
+ int op;
+ union {
+ struct {
+ int pid;
+ } fork, exec;
+ struct {
+ int (*proc)(void *);
+ void *arg;
+ } thread;
+ struct {
+ void (*proc)(void *);
+ void *arg;
+ } cb;
+ } u;
+ } request;
+};
+
+#define INIT_THREAD \
+{ \
+ .regs = EMPTY_REGS, \
+ .fault_addr = NULL, \
+ .prev_sched = NULL, \
+ .arch = INIT_ARCH_THREAD, \
+ .request = { 0 } \
+}
+
+static inline void release_thread(struct task_struct *task)
+{
+}
+
+extern unsigned long thread_saved_pc(struct task_struct *t);
+
+static inline void mm_copy_segments(struct mm_struct *from_mm,
+ struct mm_struct *new_mm)
+{
+}
+
+#define init_stack (init_thread_union.stack)
+
+/*
+ * User space process size: 3GB (default).
+ */
+extern unsigned long task_size;
+
+#define TASK_SIZE (task_size)
+
+#undef STACK_TOP
+#undef STACK_TOP_MAX
+
+extern unsigned long stacksizelim;
+
+#define STACK_ROOM (stacksizelim)
+#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
+#define STACK_TOP_MAX STACK_TOP
+
+/* This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE (0x40000000)
+
+extern void start_thread(struct pt_regs *regs, unsigned long entry,
+ unsigned long stack);
+
+struct cpuinfo_um {
+ unsigned long loops_per_jiffy;
+ int ipi_pipe[2];
+};
+
+extern struct cpuinfo_um boot_cpu_data;
+
+#define cpu_data (&boot_cpu_data)
+#define current_cpu_data boot_cpu_data
+
+#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
+extern unsigned long get_wchan(struct task_struct *p);
+
+#endif
diff --git a/arch/um/include/asm/ptrace-generic.h b/arch/um/include/asm/ptrace-generic.h
new file mode 100644
index 0000000..5ab2062
--- /dev/null
+++ b/arch/um/include/asm/ptrace-generic.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PTRACE_GENERIC_H
+#define __UM_PTRACE_GENERIC_H
+
+#ifndef __ASSEMBLY__
+
+#include <sysdep/ptrace.h>
+
+struct pt_regs {
+ struct uml_pt_regs regs;
+};
+
+#define arch_has_single_step() (1)
+
+#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
+
+#define PT_REGS_IP(r) UPT_IP(&(r)->regs)
+#define PT_REGS_SP(r) UPT_SP(&(r)->regs)
+
+#define PT_REGS_RESTART_SYSCALL(r) UPT_RESTART_SYSCALL(&(r)->regs)
+
+#define PT_REGS_SYSCALL_NR(r) UPT_SYSCALL_NR(&(r)->regs)
+
+#define instruction_pointer(regs) PT_REGS_IP(regs)
+
+#define PTRACE_OLDSETOPTIONS 21
+
+struct task_struct;
+
+extern long subarch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data);
+extern unsigned long getreg(struct task_struct *child, int regno);
+extern int putreg(struct task_struct *child, int regno, unsigned long value);
+
+extern int arch_copy_tls(struct task_struct *new);
+extern void clear_flushed_tls(struct task_struct *task);
+extern int syscall_trace_enter(struct pt_regs *regs);
+extern void syscall_trace_leave(struct pt_regs *regs);
+
+#endif
+
+#endif
diff --git a/arch/um/include/asm/sections.h b/arch/um/include/asm/sections.h
new file mode 100644
index 0000000..cafcf68
--- /dev/null
+++ b/arch/um/include/asm/sections.h
@@ -0,0 +1,9 @@
+#ifndef __UM_SECTIONS_H
+#define __UM_SECTIONS_H
+
+#include <asm-generic/sections.h>
+
+extern char __binary_start[];
+extern char __syscall_stub_start[], __syscall_stub_end[];
+
+#endif
diff --git a/arch/um/include/asm/setup.h b/arch/um/include/asm/setup.h
new file mode 100644
index 0000000..99f0863
--- /dev/null
+++ b/arch/um/include/asm/setup.h
@@ -0,0 +1,10 @@
+#ifndef SETUP_H_INCLUDED
+#define SETUP_H_INCLUDED
+
+/* POSIX mandated with _POSIX_ARG_MAX that we can rely on 4096 chars in the
+ * command line, so this choice is ok.
+ */
+
+#define COMMAND_LINE_SIZE 4096
+
+#endif /* SETUP_H_INCLUDED */
diff --git a/arch/um/include/asm/smp.h b/arch/um/include/asm/smp.h
new file mode 100644
index 0000000..9c3be35
--- /dev/null
+++ b/arch/um/include/asm/smp.h
@@ -0,0 +1,6 @@
+#ifndef __UM_SMP_H
+#define __UM_SMP_H
+
+#define hard_smp_processor_id() 0
+
+#endif
diff --git a/arch/um/include/asm/stacktrace.h b/arch/um/include/asm/stacktrace.h
new file mode 100644
index 0000000..9a86432
--- /dev/null
+++ b/arch/um/include/asm/stacktrace.h
@@ -0,0 +1,42 @@
+#ifndef _ASM_UML_STACKTRACE_H
+#define _ASM_UML_STACKTRACE_H
+
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
+
+struct stack_frame {
+ struct stack_frame *next_frame;
+ unsigned long return_address;
+};
+
+struct stacktrace_ops {
+ void (*address)(void *data, unsigned long address, int reliable);
+};
+
+#ifdef CONFIG_FRAME_POINTER
+static inline unsigned long
+get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ if (!task || task == current)
+ return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
+ return KSTK_EBP(task);
+}
+#else
+static inline unsigned long
+get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ return 0;
+}
+#endif
+
+static inline unsigned long
+*get_stack_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ if (!task || task == current)
+ return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
+ return (unsigned long *)KSTK_ESP(task);
+}
+
+void dump_trace(struct task_struct *tsk, const struct stacktrace_ops *ops, void *data);
+
+#endif /* _ASM_UML_STACKTRACE_H */
diff --git a/arch/um/include/asm/sysrq.h b/arch/um/include/asm/sysrq.h
new file mode 100644
index 0000000..c8d332b
--- /dev/null
+++ b/arch/um/include/asm/sysrq.h
@@ -0,0 +1,7 @@
+#ifndef __UM_SYSRQ_H
+#define __UM_SYSRQ_H
+
+struct task_struct;
+extern void show_trace(struct task_struct* task, unsigned long *stack);
+
+#endif
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
new file mode 100644
index 0000000..53968aa
--- /dev/null
+++ b/arch/um/include/asm/thread_info.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_THREAD_INFO_H
+#define __UM_THREAD_INFO_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/types.h>
+#include <asm/page.h>
+#include <asm/segment.h>
+
+struct thread_info {
+ struct task_struct *task; /* main task structure */
+ unsigned long flags; /* low level flags */
+ __u32 cpu; /* current CPU */
+ int preempt_count; /* 0 => preemptable,
+ <0 => BUG */
+ mm_segment_t addr_limit; /* thread address space:
+ 0-0xBFFFFFFF for user
+ 0-0xFFFFFFFF for kernel */
+ struct thread_info *real_thread; /* Points to non-IRQ stack */
+};
+
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .task = &tsk, \
+ .flags = 0, \
+ .cpu = 0, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
+ .addr_limit = KERNEL_DS, \
+ .real_thread = NULL, \
+}
+
+#define init_thread_info (init_thread_union.thread_info)
+#define init_stack (init_thread_union.stack)
+
+#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+ struct thread_info *ti;
+ unsigned long mask = THREAD_SIZE - 1;
+ void *p;
+
+ asm volatile ("" : "=r" (p) : "0" (&ti));
+ ti = (struct thread_info *) (((unsigned long)p) & ~mask);
+ return ti;
+}
+
+#define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
+
+#endif
+
+#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
+#define TIF_SIGPENDING 1 /* signal pending */
+#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
+#define TIF_RESTART_BLOCK 4
+#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
+#define TIF_SYSCALL_AUDIT 6
+#define TIF_RESTORE_SIGMASK 7
+#define TIF_NOTIFY_RESUME 8
+
+#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
+#define _TIF_MEMDIE (1 << TIF_MEMDIE)
+#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
+
+#endif
diff --git a/arch/um/include/asm/timex.h b/arch/um/include/asm/timex.h
new file mode 100644
index 0000000..0f4ada0
--- /dev/null
+++ b/arch/um/include/asm/timex.h
@@ -0,0 +1,13 @@
+#ifndef __UM_TIMEX_H
+#define __UM_TIMEX_H
+
+typedef unsigned long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+ return 0;
+}
+
+#define CLOCK_TICK_RATE (HZ)
+
+#endif
diff --git a/arch/um/include/asm/tlb.h b/arch/um/include/asm/tlb.h
new file mode 100644
index 0000000..16eb63f
--- /dev/null
+++ b/arch/um/include/asm/tlb.h
@@ -0,0 +1,134 @@
+#ifndef __UM_TLB_H
+#define __UM_TLB_H
+
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <asm/percpu.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+#define tlb_start_vma(tlb, vma) do { } while (0)
+#define tlb_end_vma(tlb, vma) do { } while (0)
+#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
+
+/* struct mmu_gather is an opaque type used by the mm code for passing around
+ * any data needed by arch specific code for tlb_remove_page.
+ */
+struct mmu_gather {
+ struct mm_struct *mm;
+ unsigned int need_flush; /* Really unmapped some ptes? */
+ unsigned long start;
+ unsigned long end;
+ unsigned int fullmm; /* non-zero means full mm flush */
+};
+
+static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
+ unsigned long address)
+{
+ if (tlb->start > address)
+ tlb->start = address;
+ if (tlb->end < address + PAGE_SIZE)
+ tlb->end = address + PAGE_SIZE;
+}
+
+static inline void init_tlb_gather(struct mmu_gather *tlb)
+{
+ tlb->need_flush = 0;
+
+ tlb->start = TASK_SIZE;
+ tlb->end = 0;
+
+ if (tlb->fullmm) {
+ tlb->start = 0;
+ tlb->end = TASK_SIZE;
+ }
+}
+
+static inline void
+tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+ tlb->mm = mm;
+ tlb->start = start;
+ tlb->end = end;
+ tlb->fullmm = !(start | (end+1));
+
+ init_tlb_gather(tlb);
+}
+
+extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
+ unsigned long end);
+
+static inline void
+tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
+{
+ flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
+}
+
+static inline void
+tlb_flush_mmu_free(struct mmu_gather *tlb)
+{
+ init_tlb_gather(tlb);
+}
+
+static inline void
+tlb_flush_mmu(struct mmu_gather *tlb)
+{
+ if (!tlb->need_flush)
+ return;
+
+ tlb_flush_mmu_tlbonly(tlb);
+ tlb_flush_mmu_free(tlb);
+}
+
+/* tlb_finish_mmu
+ * Called at the end of the shootdown operation to free up any resources
+ * that were required.
+ */
+static inline void
+tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
+{
+ tlb_flush_mmu(tlb);
+
+ /* keep the page table cache within bounds */
+ check_pgt_cache();
+}
+
+/* tlb_remove_page
+ * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
+ * while handling the additional races in SMP caused by other CPUs
+ * caching valid mappings in their TLBs.
+ */
+static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+ tlb->need_flush = 1;
+ free_page_and_swap_cache(page);
+ return 1; /* avoid calling tlb_flush_mmu */
+}
+
+static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+ __tlb_remove_page(tlb, page);
+}
+
+/**
+ * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
+ *
+ * Record the fact that pte's were really umapped in ->need_flush, so we can
+ * later optimise away the tlb invalidate. This helps when userspace is
+ * unmapping already-unmapped pages, which happens quite a lot.
+ */
+#define tlb_remove_tlb_entry(tlb, ptep, address) \
+ do { \
+ tlb->need_flush = 1; \
+ __tlb_remove_tlb_entry(tlb, ptep, address); \
+ } while (0)
+
+#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
+
+#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
+
+#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
+
+#define tlb_migrate_finish(mm) do {} while (0)
+
+#endif
diff --git a/arch/um/include/asm/tlbflush.h b/arch/um/include/asm/tlbflush.h
new file mode 100644
index 0000000..614f2c0
--- /dev/null
+++ b/arch/um/include/asm/tlbflush.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_TLBFLUSH_H
+#define __UM_TLBFLUSH_H
+
+#include <linux/mm.h>
+
+/*
+ * TLB flushing:
+ *
+ * - flush_tlb() flushes the current mm struct TLBs
+ * - flush_tlb_all() flushes all processes TLBs
+ * - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ * - flush_tlb_page(vma, vmaddr) flushes one page
+ * - flush_tlb_kernel_vm() flushes the kernel vm area
+ * - flush_tlb_range(vma, start, end) flushes a range of pages
+ */
+
+extern void flush_tlb_all(void);
+extern void flush_tlb_mm(struct mm_struct *mm);
+extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long address);
+extern void flush_tlb_kernel_vm(void);
+extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+extern void __flush_tlb_one(unsigned long addr);
+
+#endif
diff --git a/arch/um/include/asm/uaccess.h b/arch/um/include/asm/uaccess.h
new file mode 100644
index 0000000..3705620
--- /dev/null
+++ b/arch/um/include/asm/uaccess.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_UACCESS_H
+#define __UM_UACCESS_H
+
+#include <asm/thread_info.h>
+#include <asm/elf.h>
+
+#define __under_task_size(addr, size) \
+ (((unsigned long) (addr) < TASK_SIZE) && \
+ (((unsigned long) (addr) + (size)) < TASK_SIZE))
+
+#define __access_ok_vsyscall(addr, size) \
+ (((unsigned long) (addr) >= FIXADDR_USER_START) && \
+ ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
+ ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
+
+#define __addr_range_nowrap(addr, size) \
+ ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
+
+extern long __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+extern long __strnlen_user(const void __user *str, long len);
+extern unsigned long __clear_user(void __user *mem, unsigned long len);
+static inline int __access_ok(unsigned long addr, unsigned long size);
+
+/* Teach asm-generic/uaccess.h that we have C functions for these. */
+#define __access_ok __access_ok
+#define __clear_user __clear_user
+#define __copy_to_user __copy_to_user
+#define __copy_from_user __copy_from_user
+#define __strnlen_user __strnlen_user
+#define __strncpy_from_user __strncpy_from_user
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#include <asm-generic/uaccess.h>
+
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+ return __addr_range_nowrap(addr, size) &&
+ (__under_task_size(addr, size) ||
+ __access_ok_vsyscall(addr, size) ||
+ segment_eq(get_fs(), KERNEL_DS));
+}
+
+#endif