Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c76e79e010a8c48a95cfa947e192c40cdae23f7e
Commit:     c76e79e010a8c48a95cfa947e192c40cdae23f7e
Parent:     0c45a7730bbad8a3770da2698243e45b117092be
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 11:15:06 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 11:15:06 2007 +0200

    x86_64: prepare shared kernel/ldt.c
    
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
 arch/x86_64/kernel/Makefile |    2 +-
 arch/x86_64/kernel/ldt.c    |  252 -------------------------------------------
 arch/x86_64/kernel/ldt_64.c |  252 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 253 insertions(+), 253 deletions(-)

diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 71e90bb..ddc3154 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -5,7 +5,7 @@
 extra-y        := head.o head64.o init_task.o vmlinux.lds
 EXTRA_AFLAGS   := -traditional
 obj-y  := process.o signal_64.o entry.o traps_64.o irq_64.o \
-               ptrace_64.o time_64.o ioport_64.o ldt.o setup_64.o i8259_64.o 
sys_x86_64.o \
+               ptrace_64.o time_64.o ioport_64.o ldt_64.o setup_64.o 
i8259_64.o sys_x86_64.o \
                x8664_ksyms.o i387_64.o syscall.o vsyscall_64.o \
                setup64.o bootflag.o e820_64.o reboot_64.o quirks.o i8237.o \
                pci-dma_64.o pci-nommu_64.o alternative.o hpet_64.o tsc.o 
bugs_64.o \
diff --git a/arch/x86_64/kernel/ldt.c b/arch/x86_64/kernel/ldt.c
deleted file mode 100644
index bc9ffd5..0000000
--- a/arch/x86_64/kernel/ldt.c
+++ /dev/null
@@ -1,252 +0,0 @@
-/*
- * linux/arch/x86_64/kernel/ldt.c
- *
- * Copyright (C) 1992 Krishna Balasubramanian and Linus Torvalds
- * Copyright (C) 1999 Ingo Molnar <[EMAIL PROTECTED]>
- * Copyright (C) 2002 Andi Kleen
- * 
- * This handles calls from both 32bit and 64bit mode.
- */
-
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/vmalloc.h>
-#include <linux/slab.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/ldt.h>
-#include <asm/desc.h>
-#include <asm/proto.h>
-
-#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */
-static void flush_ldt(void *null)
-{
-       if (current->active_mm)
-               load_LDT(&current->active_mm->context);
-}
-#endif
-
-static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
-{
-       void *oldldt;
-       void *newldt;
-       unsigned oldsize;
-
-       if (mincount <= (unsigned)pc->size)
-               return 0;
-       oldsize = pc->size;
-       mincount = (mincount+511)&(~511);
-       if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE)
-               newldt = vmalloc(mincount*LDT_ENTRY_SIZE);
-       else
-               newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL);
-
-       if (!newldt)
-               return -ENOMEM;
-
-       if (oldsize)
-               memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE);
-       oldldt = pc->ldt;
-       memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, 
(mincount-oldsize)*LDT_ENTRY_SIZE);
-       wmb();
-       pc->ldt = newldt;
-       wmb();
-       pc->size = mincount;
-       wmb();
-       if (reload) {
-#ifdef CONFIG_SMP
-               cpumask_t mask;
-
-               preempt_disable();
-               mask = cpumask_of_cpu(smp_processor_id());
-               load_LDT(pc);
-               if (!cpus_equal(current->mm->cpu_vm_mask, mask))
-                       smp_call_function(flush_ldt, NULL, 1, 1);
-               preempt_enable();
-#else
-               load_LDT(pc);
-#endif
-       }
-       if (oldsize) {
-               if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE)
-                       vfree(oldldt);
-               else
-                       kfree(oldldt);
-       }
-       return 0;
-}
-
-static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
-{
-       int err = alloc_ldt(new, old->size, 0);
-       if (err < 0)
-               return err;
-       memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE);
-       return 0;
-}
-
-/*
- * we do not have to muck with descriptors here, that is
- * done in switch_mm() as needed.
- */
-int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
-       struct mm_struct * old_mm;
-       int retval = 0;
-
-       init_MUTEX(&mm->context.sem);
-       mm->context.size = 0;
-       old_mm = current->mm;
-       if (old_mm && old_mm->context.size > 0) {
-               down(&old_mm->context.sem);
-               retval = copy_ldt(&mm->context, &old_mm->context);
-               up(&old_mm->context.sem);
-       }
-       return retval;
-}
-
-/*
- * 
- * Don't touch the LDT register - we're already in the next thread.
- */
-void destroy_context(struct mm_struct *mm)
-{
-       if (mm->context.size) {
-               if ((unsigned)mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE)
-                       vfree(mm->context.ldt);
-               else
-                       kfree(mm->context.ldt);
-               mm->context.size = 0;
-       }
-}
-
-static int read_ldt(void __user * ptr, unsigned long bytecount)
-{
-       int err;
-       unsigned long size;
-       struct mm_struct * mm = current->mm;
-
-       if (!mm->context.size)
-               return 0;
-       if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
-               bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
-
-       down(&mm->context.sem);
-       size = mm->context.size*LDT_ENTRY_SIZE;
-       if (size > bytecount)
-               size = bytecount;
-
-       err = 0;
-       if (copy_to_user(ptr, mm->context.ldt, size))
-               err = -EFAULT;
-       up(&mm->context.sem);
-       if (err < 0)
-               goto error_return;
-       if (size != bytecount) {
-               /* zero-fill the rest */
-               if (clear_user(ptr+size, bytecount-size) != 0) {
-                       err = -EFAULT;
-                       goto error_return;
-               }
-       }
-       return bytecount;
-error_return:
-       return err;
-}
-
-static int read_default_ldt(void __user * ptr, unsigned long bytecount)
-{
-       /* Arbitrary number */ 
-       /* x86-64 default LDT is all zeros */
-       if (bytecount > 128) 
-               bytecount = 128;        
-       if (clear_user(ptr, bytecount))
-               return -EFAULT;
-       return bytecount; 
-}
-
-static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
-{
-       struct task_struct *me = current;
-       struct mm_struct * mm = me->mm;
-       __u32 entry_1, entry_2, *lp;
-       int error;
-       struct user_desc ldt_info;
-
-       error = -EINVAL;
-
-       if (bytecount != sizeof(ldt_info))
-               goto out;
-       error = -EFAULT;        
-       if (copy_from_user(&ldt_info, ptr, bytecount))
-               goto out;
-
-       error = -EINVAL;
-       if (ldt_info.entry_number >= LDT_ENTRIES)
-               goto out;
-       if (ldt_info.contents == 3) {
-               if (oldmode)
-                       goto out;
-               if (ldt_info.seg_not_present == 0)
-                       goto out;
-       }
-
-       down(&mm->context.sem);
-       if (ldt_info.entry_number >= (unsigned)mm->context.size) {
-               error = alloc_ldt(&current->mm->context, 
ldt_info.entry_number+1, 1);
-               if (error < 0)
-                       goto out_unlock;
-       }
-
-       lp = (__u32 *) ((ldt_info.entry_number << 3) + (char *) 
mm->context.ldt);
-
-       /* Allow LDTs to be cleared by the user. */
-       if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
-               if (oldmode || LDT_empty(&ldt_info)) {
-                       entry_1 = 0;
-                       entry_2 = 0;
-                       goto install;
-               }
-       }
-
-       entry_1 = LDT_entry_a(&ldt_info);
-       entry_2 = LDT_entry_b(&ldt_info);
-       if (oldmode)
-               entry_2 &= ~(1 << 20);
-
-       /* Install the new entry ...  */
-install:
-       *lp     = entry_1;
-       *(lp+1) = entry_2;
-       error = 0;
-
-out_unlock:
-       up(&mm->context.sem);
-out:
-       return error;
-}
-
-asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long 
bytecount)
-{
-       int ret = -ENOSYS;
-
-       switch (func) {
-       case 0:
-               ret = read_ldt(ptr, bytecount);
-               break;
-       case 1:
-               ret = write_ldt(ptr, bytecount, 1);
-               break;
-       case 2:
-               ret = read_default_ldt(ptr, bytecount);
-               break;
-       case 0x11:
-               ret = write_ldt(ptr, bytecount, 0);
-               break;
-       }
-       return ret;
-}
diff --git a/arch/x86_64/kernel/ldt_64.c b/arch/x86_64/kernel/ldt_64.c
new file mode 100644
index 0000000..bc9ffd5
--- /dev/null
+++ b/arch/x86_64/kernel/ldt_64.c
@@ -0,0 +1,252 @@
+/*
+ * linux/arch/x86_64/kernel/ldt.c
+ *
+ * Copyright (C) 1992 Krishna Balasubramanian and Linus Torvalds
+ * Copyright (C) 1999 Ingo Molnar <[EMAIL PROTECTED]>
+ * Copyright (C) 2002 Andi Kleen
+ * 
+ * This handles calls from both 32bit and 64bit mode.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/ldt.h>
+#include <asm/desc.h>
+#include <asm/proto.h>
+
+#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */
+static void flush_ldt(void *null)
+{
+       if (current->active_mm)
+               load_LDT(&current->active_mm->context);
+}
+#endif
+
+static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
+{
+       void *oldldt;
+       void *newldt;
+       unsigned oldsize;
+
+       if (mincount <= (unsigned)pc->size)
+               return 0;
+       oldsize = pc->size;
+       mincount = (mincount+511)&(~511);
+       if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE)
+               newldt = vmalloc(mincount*LDT_ENTRY_SIZE);
+       else
+               newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL);
+
+       if (!newldt)
+               return -ENOMEM;
+
+       if (oldsize)
+               memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE);
+       oldldt = pc->ldt;
+       memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, 
(mincount-oldsize)*LDT_ENTRY_SIZE);
+       wmb();
+       pc->ldt = newldt;
+       wmb();
+       pc->size = mincount;
+       wmb();
+       if (reload) {
+#ifdef CONFIG_SMP
+               cpumask_t mask;
+
+               preempt_disable();
+               mask = cpumask_of_cpu(smp_processor_id());
+               load_LDT(pc);
+               if (!cpus_equal(current->mm->cpu_vm_mask, mask))
+                       smp_call_function(flush_ldt, NULL, 1, 1);
+               preempt_enable();
+#else
+               load_LDT(pc);
+#endif
+       }
+       if (oldsize) {
+               if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE)
+                       vfree(oldldt);
+               else
+                       kfree(oldldt);
+       }
+       return 0;
+}
+
+static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
+{
+       int err = alloc_ldt(new, old->size, 0);
+       if (err < 0)
+               return err;
+       memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE);
+       return 0;
+}
+
+/*
+ * we do not have to muck with descriptors here, that is
+ * done in switch_mm() as needed.
+ */
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+       struct mm_struct * old_mm;
+       int retval = 0;
+
+       init_MUTEX(&mm->context.sem);
+       mm->context.size = 0;
+       old_mm = current->mm;
+       if (old_mm && old_mm->context.size > 0) {
+               down(&old_mm->context.sem);
+               retval = copy_ldt(&mm->context, &old_mm->context);
+               up(&old_mm->context.sem);
+       }
+       return retval;
+}
+
+/*
+ * 
+ * Don't touch the LDT register - we're already in the next thread.
+ */
+void destroy_context(struct mm_struct *mm)
+{
+       if (mm->context.size) {
+               if ((unsigned)mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE)
+                       vfree(mm->context.ldt);
+               else
+                       kfree(mm->context.ldt);
+               mm->context.size = 0;
+       }
+}
+
+static int read_ldt(void __user * ptr, unsigned long bytecount)
+{
+       int err;
+       unsigned long size;
+       struct mm_struct * mm = current->mm;
+
+       if (!mm->context.size)
+               return 0;
+       if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
+               bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
+
+       down(&mm->context.sem);
+       size = mm->context.size*LDT_ENTRY_SIZE;
+       if (size > bytecount)
+               size = bytecount;
+
+       err = 0;
+       if (copy_to_user(ptr, mm->context.ldt, size))
+               err = -EFAULT;
+       up(&mm->context.sem);
+       if (err < 0)
+               goto error_return;
+       if (size != bytecount) {
+               /* zero-fill the rest */
+               if (clear_user(ptr+size, bytecount-size) != 0) {
+                       err = -EFAULT;
+                       goto error_return;
+               }
+       }
+       return bytecount;
+error_return:
+       return err;
+}
+
+static int read_default_ldt(void __user * ptr, unsigned long bytecount)
+{
+       /* Arbitrary number */ 
+       /* x86-64 default LDT is all zeros */
+       if (bytecount > 128) 
+               bytecount = 128;        
+       if (clear_user(ptr, bytecount))
+               return -EFAULT;
+       return bytecount; 
+}
+
+static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
+{
+       struct task_struct *me = current;
+       struct mm_struct * mm = me->mm;
+       __u32 entry_1, entry_2, *lp;
+       int error;
+       struct user_desc ldt_info;
+
+       error = -EINVAL;
+
+       if (bytecount != sizeof(ldt_info))
+               goto out;
+       error = -EFAULT;        
+       if (copy_from_user(&ldt_info, ptr, bytecount))
+               goto out;
+
+       error = -EINVAL;
+       if (ldt_info.entry_number >= LDT_ENTRIES)
+               goto out;
+       if (ldt_info.contents == 3) {
+               if (oldmode)
+                       goto out;
+               if (ldt_info.seg_not_present == 0)
+                       goto out;
+       }
+
+       down(&mm->context.sem);
+       if (ldt_info.entry_number >= (unsigned)mm->context.size) {
+               error = alloc_ldt(&current->mm->context, 
ldt_info.entry_number+1, 1);
+               if (error < 0)
+                       goto out_unlock;
+       }
+
+       lp = (__u32 *) ((ldt_info.entry_number << 3) + (char *) 
mm->context.ldt);
+
+       /* Allow LDTs to be cleared by the user. */
+       if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
+               if (oldmode || LDT_empty(&ldt_info)) {
+                       entry_1 = 0;
+                       entry_2 = 0;
+                       goto install;
+               }
+       }
+
+       entry_1 = LDT_entry_a(&ldt_info);
+       entry_2 = LDT_entry_b(&ldt_info);
+       if (oldmode)
+               entry_2 &= ~(1 << 20);
+
+       /* Install the new entry ...  */
+install:
+       *lp     = entry_1;
+       *(lp+1) = entry_2;
+       error = 0;
+
+out_unlock:
+       up(&mm->context.sem);
+out:
+       return error;
+}
+
+asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long 
bytecount)
+{
+       int ret = -ENOSYS;
+
+       switch (func) {
+       case 0:
+               ret = read_ldt(ptr, bytecount);
+               break;
+       case 1:
+               ret = write_ldt(ptr, bytecount, 1);
+               break;
+       case 2:
+               ret = read_default_ldt(ptr, bytecount);
+               break;
+       case 0x11:
+               ret = write_ldt(ptr, bytecount, 0);
+               break;
+       }
+       return ret;
+}
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to