sh: Initial vsyscall page support.

This implements initial support for the vsyscall page on SH.
At the moment we leave it configurable due to having nommu
to support from the same code base. We hook it up for the
signal trampoline return at present, with more to be added
later, once uClibc catches up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 10 insertions, 8 deletions

diff --git a/arch/sh/mm/tlb-flush.c b/arch/sh/mm/tlb-flush.c
index fd7e42bcaa40..73ec7f6084fa 100644
--- a/arch/sh/mm/tlb-flush.c
+++ b/arch/sh/mm/tlb-flush.c
@@ -14,12 +14,12 @@
 
 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 {
-        if (vma->vm_mm && vma->vm_mm->context != NO_CONTEXT) {
+        if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) {
                 unsigned long flags;
                 unsigned long asid;
                 unsigned long saved_asid = MMU_NO_ASID;
 
-                asid = vma->vm_mm->context & MMU_CONTEXT_ASID_MASK;
+                asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK;
                 page &= PAGE_MASK;
 
                 local_irq_save(flags);
@@ -39,20 +39,21 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 {
         struct mm_struct *mm = vma->vm_mm;
 
-        if (mm->context != NO_CONTEXT) {
+        if (mm->context.id != NO_CONTEXT) {
                 unsigned long flags;
                 int size;
 
                 local_irq_save(flags);
                 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
                 if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
-                        mm->context = NO_CONTEXT;
+                        mm->context.id = NO_CONTEXT;
                         if (mm == current->mm)
                                 activate_context(mm);
                 } else {
-                        unsigned long asid = mm->context&MMU_CONTEXT_ASID_MASK;
+                        unsigned long asid;
                         unsigned long saved_asid = MMU_NO_ASID;
 
+                        asid = mm->context.id & MMU_CONTEXT_ASID_MASK;
                         start &= PAGE_MASK;
                         end += (PAGE_SIZE - 1);
                         end &= PAGE_MASK;
@@ -81,9 +82,10 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
         if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
                 flush_tlb_all();
         } else {
-                unsigned long asid = init_mm.context&MMU_CONTEXT_ASID_MASK;
+                unsigned long asid;
                 unsigned long saved_asid = get_asid();
 
+                asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK;
                 start &= PAGE_MASK;
                 end += (PAGE_SIZE - 1);
                 end &= PAGE_MASK;
@@ -101,11 +103,11 @@ void flush_tlb_mm(struct mm_struct *mm)
 {
         /* Invalidate all TLB of this process. */
         /* Instead of invalidating each TLB, we get new MMU context. */
-        if (mm->context != NO_CONTEXT) {
+        if (mm->context.id != NO_CONTEXT) {
                 unsigned long flags;
 
                 local_irq_save(flags);
-                mm->context = NO_CONTEXT;
+                mm->context.id = NO_CONTEXT;
                 if (mm == current->mm)
                         activate_context(mm);
                 local_irq_restore(flags);