2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/stddef.h"
7 #include "linux/kernel.h"
8 #include "linux/sched.h"
11 #include "asm/pgtable.h"
12 #include "asm/uaccess.h"
13 #include "user_util.h"
17 static void fix_range(struct mm_struct *mm, unsigned long start_addr,
18 unsigned long end_addr, int force)
26 if((current->thread.mode.tt.extern_pid != -1) &&
27 (current->thread.mode.tt.extern_pid != os_getpid()))
28 panic("fix_range fixing wrong address space, current = 0x%p",
30 if(mm == NULL) return;
31 for(addr=start_addr;addr<end_addr;){
32 if(addr == TASK_SIZE){
33 /* Skip over kernel text, kernel data, and physical
34 * memory, which don't have ptes, plus kernel virtual
35 * memory, which is flushed separately, and remap
36 * the process stack. The only way to get here is
37 * if (end_addr == STACK_TOP) > TASK_SIZE, which is
38 * only true in the honeypot case.
40 addr = STACK_TOP - ABOVE_KMEM;
43 npgd = pgd_offset(mm, addr);
44 npmd = pmd_offset(npgd, addr);
45 if(pmd_present(*npmd)){
46 npte = pte_offset_kernel(npmd, addr);
50 if(!pte_dirty(*npte)) w = 0;
51 if(!pte_young(*npte)){
55 if(force || pte_newpage(*npte)){
56 err = os_unmap_memory((void *) addr,
59 panic("munmap failed, errno = %d\n",
61 if(pte_present(*npte))
63 pte_val(*npte) & PAGE_MASK,
66 else if(pte_newprot(*npte)){
67 protect_memory(addr, PAGE_SIZE, r, w, x, 1);
69 *npte = pte_mkuptodate(*npte);
73 if(force || pmd_newpage(*npmd)){
74 err = os_unmap_memory((void *) addr, PMD_SIZE);
76 panic("munmap failed, errno = %d\n",
78 pmd_mkuptodate(*npmd);
85 atomic_t vmchange_seq = ATOMIC_INIT(1);
87 static void flush_kernel_vm_range(unsigned long start, unsigned long end,
98 for(addr = start; addr < end;){
99 pgd = pgd_offset(mm, addr);
100 pmd = pmd_offset(pgd, addr);
101 if(pmd_present(*pmd)){
102 pte = pte_offset_kernel(pmd, addr);
103 if(!pte_present(*pte) || pte_newpage(*pte)){
105 err = os_unmap_memory((void *) addr,
108 panic("munmap failed, errno = %d\n",
110 if(pte_present(*pte))
112 pte_val(*pte) & PAGE_MASK,
115 else if(pte_newprot(*pte)){
117 protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
122 if(pmd_newpage(*pmd)){
124 err = os_unmap_memory((void *) addr, PMD_SIZE);
126 panic("munmap failed, errno = %d\n",
132 if(updated && update_seq) atomic_inc(&vmchange_seq);
135 void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
137 flush_kernel_vm_range(start, end, 1);
140 static void protect_vm_page(unsigned long addr, int w, int must_succeed)
144 err = protect_memory(addr, PAGE_SIZE, 1, w, 1, must_succeed);
146 else if((err == -EFAULT) || (err == -ENOMEM)){
147 flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
148 protect_vm_page(addr, w, 1);
150 else panic("protect_vm_page : protect failed, errno = %d\n", err);
153 void mprotect_kernel_vm(int w)
155 struct mm_struct *mm;
162 for(addr = start_vm; addr < end_vm;){
163 pgd = pgd_offset(mm, addr);
164 pmd = pmd_offset(pgd, addr);
165 if(pmd_present(*pmd)){
166 pte = pte_offset_kernel(pmd, addr);
167 if(pte_present(*pte)) protect_vm_page(addr, w, 0);
170 else addr += PMD_SIZE;
174 void flush_tlb_kernel_vm_tt(void)
176 flush_tlb_kernel_range(start_vm, end_vm);
179 void __flush_tlb_one_tt(unsigned long addr)
181 flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
184 void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start,
187 if(vma->vm_mm != current->mm) return;
189 /* Assumes that the range start ... end is entirely within
190 * either process memory or kernel vm
192 if((start >= start_vm) && (start < end_vm))
193 flush_kernel_vm_range(start, end, 1);
194 else fix_range(vma->vm_mm, start, end, 0);
197 void flush_tlb_mm_tt(struct mm_struct *mm)
201 if(mm != current->mm) return;
203 fix_range(mm, 0, STACK_TOP, 0);
205 seq = atomic_read(&vmchange_seq);
206 if(current->thread.mode.tt.vm_seq == seq) return;
207 current->thread.mode.tt.vm_seq = seq;
208 flush_kernel_vm_range(start_vm, end_vm, 0);
211 void force_flush_all_tt(void)
213 fix_range(current->mm, 0, STACK_TOP, 1);
214 flush_kernel_vm_range(start_vm, end_vm, 0);
218 * Overrides for Emacs so that we follow Linus's tabbing style.
219 * Emacs will notice this stuff at the end of the file and automatically
220 * adjust the settings for this buffer only. This must remain at the end
222 * ---------------------------------------------------------------------------
224 * c-file-style: "linux"