1 files changed, 129 insertions, 5 deletions

diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 312e8ba30cd3..12b8c637527d 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -8,12 +8,12 @@
 #include "asm/pgalloc.h"
 #include "asm/pgtable.h"
 #include "asm/tlbflush.h"
-#include "mode_kern.h"
 #include "as-layout.h"
 #include "tlb.h"
 #include "mem.h"
 #include "mem_user.h"
 #include "os.h"
+#include "skas.h"
 
 static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
                     unsigned int prot, struct host_vm_op *ops, int *index,
@@ -341,6 +341,71 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
         return(updated);
 }
 
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+        struct mm_struct *mm = vma->vm_mm;
+        void *flush = NULL;
+        int r, w, x, prot, err = 0;
+        struct mm_id *mm_id;
+
+        address &= PAGE_MASK;
+        pgd = pgd_offset(mm, address);
+        if(!pgd_present(*pgd))
+                goto kill;
+
+        pud = pud_offset(pgd, address);
+        if(!pud_present(*pud))
+                goto kill;
+
+        pmd = pmd_offset(pud, address);
+        if(!pmd_present(*pmd))
+                goto kill;
+
+        pte = pte_offset_kernel(pmd, address);
+
+        r = pte_read(*pte);
+        w = pte_write(*pte);
+        x = pte_exec(*pte);
+        if (!pte_young(*pte)) {
+                r = 0;
+                w = 0;
+        } else if (!pte_dirty(*pte)) {
+                w = 0;
+        }
+
+        mm_id = &mm->context.skas.id;
+        prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+                (x ? UM_PROT_EXEC : 0));
+        if(pte_newpage(*pte)){
+                if(pte_present(*pte)){
+                        unsigned long long offset;
+                        int fd;
+
+                        fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
+                        err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+                                  1, &flush);
+                }
+                else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
+        }
+        else if(pte_newprot(*pte))
+                err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
+
+        if(err)
+                goto kill;
+
+        *pte = pte_mkuptodate(*pte);
+
+        return;
+
+kill:
+        printk("Failed to flush page for address 0x%lx\n", address);
+        force_sig(SIGKILL, current);
+}
+
 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
 {
         return(pgd_offset(mm, address));
@@ -387,21 +452,80 @@ void flush_tlb_kernel_vm(void)
 
 void __flush_tlb_one(unsigned long addr)
 {
-        __flush_tlb_one_skas(addr);
+        flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
+                  int finished, void **flush)
+{
+        struct host_vm_op *op;
+        int i, ret = 0;
+
+        for(i = 0; i <= last && !ret; i++){
+                op = &ops[i];
+                switch(op->type){
+                case MMAP:
+                        ret = map(&mmu->skas.id, op->u.mmap.addr,
+                                  op->u.mmap.len, op->u.mmap.prot,
+                                  op->u.mmap.fd, op->u.mmap.offset, finished,
+                                  flush);
+                        break;
+                case MUNMAP:
+                        ret = unmap(&mmu->skas.id, op->u.munmap.addr,
+                                    op->u.munmap.len, finished, flush);
+                        break;
+                case MPROTECT:
+                        ret = protect(&mmu->skas.id, op->u.mprotect.addr,
+                                      op->u.mprotect.len, op->u.mprotect.prot,
+                                      finished, flush);
+                        break;
+                default:
+                        printk("Unknown op type %d in do_ops\n", op->type);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+                      unsigned long end_addr, int force)
+{
+        if(!proc_mm && (end_addr > CONFIG_STUB_START))
+                end_addr = CONFIG_STUB_START;
+
+        fix_range_common(mm, start_addr, end_addr, force, do_ops);
 }
 
 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
                      unsigned long end)
 {
-        flush_tlb_range_skas(vma, start, end);
+        if(vma->vm_mm == NULL)
+                flush_tlb_kernel_range_common(start, end);
+        else fix_range(vma->vm_mm, start, end, 0);
 }
 
 void flush_tlb_mm(struct mm_struct *mm)
 {
-        flush_tlb_mm_skas(mm);
+        unsigned long end;
+
+        /* Don't bother flushing if this address space is about to be
+         * destroyed.
+         */
+        if(atomic_read(&mm->mm_users) == 0)
+                return;
+
+        end = proc_mm ? task_size : CONFIG_STUB_START;
+        fix_range(mm, 0, end, 0);
 }
 
 void force_flush_all(void)
 {
-        force_flush_all_skas();
+        struct mm_struct *mm = current->mm;
+        struct vm_area_struct *vma = mm->mmap;
+
+        while(vma != NULL) {
+                fix_range(mm, vma->vm_start, vma->vm_end, 1);
+                vma = vma->vm_next;
+        }
 }