arch/um/kernel/skas/tlb.c

/* 
 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
 * Copyright 2003 PathScale, Inc.
 * Licensed under the GPL
 */

#include "linux/stddef.h"
#include "linux/sched.h"
#include "linux/config.h"
#include "linux/mm.h"
#include "asm/page.h"
#include "asm/pgtable.h"
#include "asm/mmu.h"
#include "user_util.h"
#include "mem_user.h"
#include "mem.h"
#include "skas.h"
#include "os.h"
#include "tlb.h"

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.r, op->u.mmap.w,
				  op->u.mmap.x, op->u.mmap.fd,
				  op->u.mmap.offset, finished, flush);
			break;
		case MUNMAP:
			ret = unmap(&mmu->skas.id,
				    (void *) 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.r,
				      op->u.mprotect.w, op->u.mprotect.x,
				      finished, flush);
			break;
		default:
			printk("Unknown op type %d in do_ops\n", op->type);
			break;
		}
	}

	return ret;
}

extern int proc_mm;

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_one_skas(unsigned long addr)
{
        flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
}

void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start, 
		     unsigned long 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_skas(struct mm_struct *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_skas(void)
{
	unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
        fix_range(current->mm, 0, end, 1);
}