165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Copyright 2003 PathScale, Inc.
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* Licensed under the GPL
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*/
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#include "linux/stddef.h"
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#include "linux/sched.h"
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#include "linux/mm.h"
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#include "asm/page.h"
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#include "asm/pgtable.h"
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#include "asm/mmu.h"
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#include "mem_user.h"
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#include "mem.h"
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#include "skas.h"
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#include "os.h"
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#include "tlb.h"
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static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
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int finished, void **flush)
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{
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struct host_vm_op *op;
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int i, ret = 0;
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for(i = 0; i <= last && !ret; i++){
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op = &ops[i];
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switch(op->type){
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case MMAP:
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ret = map(&mmu->skas.id, op->u.mmap.addr,
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op->u.mmap.len, op->u.mmap.prot,
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op->u.mmap.fd, op->u.mmap.offset, finished,
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flush);
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break;
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case MUNMAP:
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ret = unmap(&mmu->skas.id, op->u.munmap.addr,
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op->u.munmap.len, finished, flush);
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break;
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case MPROTECT:
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ret = protect(&mmu->skas.id, op->u.mprotect.addr,
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op->u.mprotect.len, op->u.mprotect.prot,
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finished, flush);
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break;
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default:
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printk("Unknown op type %d in do_ops\n", op->type);
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break;
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}
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}
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return ret;
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}
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extern int proc_mm;
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static void fix_range(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force)
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{
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if(!proc_mm && (end_addr > CONFIG_STUB_START))
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end_addr = CONFIG_STUB_START;
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fix_range_common(mm, start_addr, end_addr, force, do_ops);
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}
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void __flush_tlb_one_skas(unsigned long addr)
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{
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flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
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}
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void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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if(vma->vm_mm == NULL)
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flush_tlb_kernel_range_common(start, end);
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else fix_range(vma->vm_mm, start, end, 0);
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}
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void flush_tlb_mm_skas(struct mm_struct *mm)
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{
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unsigned long end;
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/* Don't bother flushing if this address space is about to be
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* destroyed.
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*/
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if(atomic_read(&mm->mm_users) == 0)
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return;
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end = proc_mm ? task_size : CONFIG_STUB_START;
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fix_range(mm, 0, end, 0);
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}
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void force_flush_all_skas(void)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma = mm->mmap;
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while(vma != NULL) {
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fix_range(mm, vma->vm_start, vma->vm_end, 1);
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vma = vma->vm_next;
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}
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}
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void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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struct mm_struct *mm = vma->vm_mm;
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void *flush = NULL;
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int r, w, x, prot, err = 0;
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struct mm_id *mm_id;
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pgd = pgd_offset(mm, address);
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if(!pgd_present(*pgd))
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goto kill;
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pud = pud_offset(pgd, address);
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if(!pud_present(*pud))
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goto kill;
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pmd = pmd_offset(pud, address);
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if(!pmd_present(*pmd))
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goto kill;
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pte = pte_offset_kernel(pmd, address);
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r = pte_read(*pte);
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w = pte_write(*pte);
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x = pte_exec(*pte);
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if (!pte_young(*pte)) {
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r = 0;
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w = 0;
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} else if (!pte_dirty(*pte)) {
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w = 0;
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}
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mm_id = &mm->context.skas.id;
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prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
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(x ? UM_PROT_EXEC : 0));
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if(pte_newpage(*pte)){
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if(pte_present(*pte)){
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unsigned long long offset;
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int fd;
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fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
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err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
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1, &flush);
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}
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else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
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}
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else if(pte_newprot(*pte))
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err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
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if(err)
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goto kill;
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*pte = pte_mkuptodate(*pte);
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return;
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kill:
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printk("Failed to flush page for address 0x%lx\n", address);
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force_sig(SIGKILL, current);
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}
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