1 files changed, 149 insertions, 0 deletions
diff --git a/arch/um/kernel/tt/tlb.c b/arch/um/kernel/tt/tlb.c
new file mode 100644
index 00000000000..203216ad86f
--- /dev/null
+++ b/arch/um/kernel/tt/tlb.c
@@ -0,0 +1,149 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/kernel.h"
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/uaccess.h"
+#include "asm/tlbflush.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "os.h"
+#include "tlb.h"
+
+static void do_ops(int unused, struct host_vm_op *ops, int last)
+{
+	struct host_vm_op *op;
+	int i;
+
+	for(i = 0; i <= last; i++){
+		op = &ops[i];
+		switch(op->type){
+		case MMAP:
+                        os_map_memory((void *) op->u.mmap.addr, op->u.mmap.fd,
+				      op->u.mmap.offset, op->u.mmap.len,
+				      op->u.mmap.r, op->u.mmap.w,
+				      op->u.mmap.x);
+			break;
+		case MUNMAP:
+			os_unmap_memory((void *) op->u.munmap.addr,
+					op->u.munmap.len);
+			break;
+		case MPROTECT:
+			protect_memory(op->u.mprotect.addr, op->u.munmap.len,
+				       op->u.mprotect.r, op->u.mprotect.w,
+				       op->u.mprotect.x, 1);
+			break;
+		default:
+			printk("Unknown op type %d in do_ops\n", op->type);
+			break;
+		}
+	}
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr, 
+		      unsigned long end_addr, int force)
+{
+        if((current->thread.mode.tt.extern_pid != -1) &&
+           (current->thread.mode.tt.extern_pid != os_getpid()))
+                panic("fix_range fixing wrong address space, current = 0x%p",
+                      current);
+
+        fix_range_common(mm, start_addr, end_addr, force, 0, do_ops);
+}
+
+atomic_t vmchange_seq = ATOMIC_INIT(1);
+
+void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
+{
+        if(flush_tlb_kernel_range_common(start, end))
+                atomic_inc(&vmchange_seq);
+}
+
+static void protect_vm_page(unsigned long addr, int w, int must_succeed)
+{
+	int err;
+
+	err = protect_memory(addr, PAGE_SIZE, 1, w, 1, must_succeed);
+	if(err == 0) return;
+	else if((err == -EFAULT) || (err == -ENOMEM)){
+		flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+		protect_vm_page(addr, w, 1);
+	}
+	else panic("protect_vm_page : protect failed, errno = %d\n", err);
+}
+
+void mprotect_kernel_vm(int w)
+{
+	struct mm_struct *mm;
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+	unsigned long addr;
+	
+	mm = &init_mm;
+	for(addr = start_vm; addr < end_vm;){
+		pgd = pgd_offset(mm, addr);
+		pud = pud_offset(pgd, addr);
+		pmd = pmd_offset(pud, addr);
+		if(pmd_present(*pmd)){
+			pte = pte_offset_kernel(pmd, addr);
+			if(pte_present(*pte)) protect_vm_page(addr, w, 0);
+			addr += PAGE_SIZE;
+		}
+		else addr += PMD_SIZE;
+	}
+}
+
+void flush_tlb_kernel_vm_tt(void)
+{
+        flush_tlb_kernel_range(start_vm, end_vm);
+}
+
+void __flush_tlb_one_tt(unsigned long addr)
+{
+        flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+}
+  
+void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start, 
+		     unsigned long end)
+{
+	if(vma->vm_mm != current->mm) return;
+
+	/* Assumes that the range start ... end is entirely within
+	 * either process memory or kernel vm
+	 */
+	if((start >= start_vm) && (start < end_vm)){
+		if(flush_tlb_kernel_range_common(start, end))
+			atomic_inc(&vmchange_seq);
+	}
+	else fix_range(vma->vm_mm, start, end, 0);
+}
+
+void flush_tlb_mm_tt(struct mm_struct *mm)
+{
+	unsigned long seq;
+
+	if(mm != current->mm) return;
+
+	fix_range(mm, 0, STACK_TOP, 0);
+
+	seq = atomic_read(&vmchange_seq);
+	if(current->thread.mode.tt.vm_seq == seq)
+		return;
+	current->thread.mode.tt.vm_seq = seq;
+	flush_tlb_kernel_range_common(start_vm, end_vm);
+}
+
+void force_flush_all_tt(void)
+{
+	fix_range(current->mm, 0, STACK_TOP, 1);
+	flush_tlb_kernel_range_common(start_vm, end_vm);
+}