#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/slab.h>
+#include <linux/module.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
if (address >= end)
BUG();
do {
- pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
+ pte_t * pte = pte_alloc_kernel(pmd, address);
if (!pte)
return -ENOMEM;
remap_area_pte(pte, address, end - address, address + phys_addr, flags);
flush_cache_all();
if (address >= end)
BUG();
- spin_lock(&init_mm.page_table_lock);
do {
pud_t *pud;
pud = pud_alloc(&init_mm, pgd, address);
address = (address + PGDIR_SIZE) & PGDIR_MASK;
pgd++;
} while (address && (address < end));
- spin_unlock(&init_mm.page_table_lock);
flush_tlb_all();
return error;
}
}
return (__force void __iomem *) (offset + (char *)addr);
}
+EXPORT_SYMBOL(__ioremap);
/**
* ioremap_nocache - map bus memory into CPU space
{
return __ioremap(phys_addr, size, _PAGE_PCD);
}
+EXPORT_SYMBOL(ioremap_nocache);
+/**
+ * iounmap - Free a IO remapping
+ * @addr: virtual address from ioremap_*
+ *
+ * Caller must ensure there is only one unmapping for the same pointer.
+ */
void iounmap(volatile void __iomem *addr)
{
- struct vm_struct *p;
+ struct vm_struct *p, *o;
if (addr <= high_memory)
return;
addr < phys_to_virt(ISA_END_ADDRESS))
return;
- write_lock(&vmlist_lock);
- p = __remove_vm_area((void *)((unsigned long)addr & PAGE_MASK));
- if (!p)
+ addr = (volatile void __iomem *)(PAGE_MASK & (unsigned long __force)addr);
+ /* Use the vm area unlocked, assuming the caller
+ ensures there isn't another iounmap for the same address
+ in parallel. Reuse of the virtual address is prevented by
+ leaving it in the global lists until we're done with it.
+ cpa takes care of the direct mappings. */
+ read_lock(&vmlist_lock);
+ for (p = vmlist; p; p = p->next) {
+ if (p->addr == addr)
+ break;
+ }
+ read_unlock(&vmlist_lock);
+
+ if (!p) {
printk("iounmap: bad address %p\n", addr);
- else if (p->flags >> 20)
+ dump_stack();
+ return;
+ }
+
+ /* Reset the direct mapping. Can block */
+ if (p->flags >> 20)
ioremap_change_attr(p->phys_addr, p->size, 0);
- write_unlock(&vmlist_lock);
+
+ /* Finally remove it */
+ o = remove_vm_area((void *)addr);
+ BUG_ON(p != o || o == NULL);
kfree(p);
}
+EXPORT_SYMBOL(iounmap);
+