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-rw-r--r--arch/um/kernel/tt/tlb.c149
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 0000000..203216a
--- /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);
+}
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