* (C) Copyright 1995 1996 Linus Torvalds
*/
+#include <linux/bootmem.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
+#ifdef CONFIG_X86_64
+
unsigned long __phys_addr(unsigned long x)
{
if (x >= __START_KERNEL_map)
}
EXPORT_SYMBOL(__phys_addr);
+#endif
+
/*
* Fix up the linear direct mapping of the kernel to avoid cache attribute
* conflicts.
static int ioremap_change_attr(unsigned long phys_addr, unsigned long size,
pgprot_t prot)
{
- int err = 0;
- if (phys_addr + size - 1 < (end_pfn_map << PAGE_SHIFT)) {
- unsigned long npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long vaddr = (unsigned long) __va(phys_addr);
- int level;
-
- /*
- * If there is no identity map for this address,
- * change_page_attr_addr is unnecessary
- */
- if (!lookup_address(vaddr, &level))
- return err;
- /*
- * Must use a address here and not struct page because
- * the phys addr can be a in hole between nodes and
- * not have an memmap entry.
- */
- err = change_page_attr_addr(vaddr, npages, prot);
-
- if (!err)
- global_flush_tlb();
- }
+ unsigned long npages, vaddr, last_addr = phys_addr + size - 1;
+ int err, level;
+
+ /* No change for pages after the last mapping */
+ if (last_addr >= (max_pfn_mapped << PAGE_SHIFT))
+ return 0;
+
+ npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ vaddr = (unsigned long) __va(phys_addr);
+
+ /*
+ * If there is no identity map for this address,
+ * change_page_attr_addr is unnecessary
+ */
+ if (!lookup_address(vaddr, &level))
+ return 0;
+
+ /*
+ * Must use an address here and not struct page because the
+ * phys addr can be a in hole between nodes and not have a
+ * memmap entry.
+ */
+ err = change_page_attr_addr(vaddr, npages, prot);
+
+ if (!err)
+ global_flush_tlb();
+
return err;
}
if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS)
return (__force void __iomem *)phys_to_virt(phys_addr);
+#ifdef CONFIG_X86_32
+ /*
+ * Don't allow anybody to remap normal RAM that we're using..
+ */
+ if (phys_addr <= virt_to_phys(high_memory - 1)) {
+ char *t_addr, *t_end;
+ struct page *page;
+
+ t_addr = __va(phys_addr);
+ t_end = t_addr + (size - 1);
+
+ for (page = virt_to_page(t_addr);
+ page <= virt_to_page(t_end); page++)
+ if (!PageReserved(page))
+ return NULL;
+ }
+#endif
+
pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags);
+
/*
* Mappings have to be page-aligned
*/
remove_vm_area((void *)(PAGE_MASK & (unsigned long) addr));
return NULL;
}
+
if (ioremap_change_attr(phys_addr, size, pgprot) < 0) {
vunmap(addr);
return NULL;
}
+
return (void __iomem *) (offset + (char __iomem *)addr);
}
EXPORT_SYMBOL(__ioremap);
if ((void __force *)addr <= high_memory)
return;
+
+ /*
+ * __ioremap special-cases the PCI/ISA range by not instantiating a
+ * vm_area and by simply returning an address into the kernel mapping
+ * of ISA space. So handle that here.
+ */
if (addr >= phys_to_virt(ISA_START_ADDRESS) &&
addr < phys_to_virt(ISA_END_ADDRESS))
return;
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
}
EXPORT_SYMBOL(iounmap);
+#ifdef CONFIG_X86_32
+
+int __initdata early_ioremap_debug;
+
+static int __init early_ioremap_debug_setup(char *str)
+{
+ early_ioremap_debug = 1;
+
+ return 0;
+}
+early_param("early_ioremap_debug", early_ioremap_debug_setup);
+
+static __initdata int after_paging_init;
+static __initdata unsigned long bm_pte[1024]
+ __attribute__((aligned(PAGE_SIZE)));
+
+static inline unsigned long * __init early_ioremap_pgd(unsigned long addr)
+{
+ return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023);
+}
+
+static inline unsigned long * __init early_ioremap_pte(unsigned long addr)
+{
+ return bm_pte + ((addr >> PAGE_SHIFT) & 1023);
+}
+
+void __init early_ioremap_init(void)
+{
+ unsigned long *pgd;
+
+ if (early_ioremap_debug)
+ printk(KERN_DEBUG "early_ioremap_init()\n");
+
+ pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
+ *pgd = __pa(bm_pte) | _PAGE_TABLE;
+ memset(bm_pte, 0, sizeof(bm_pte));
+ /*
+ * The boot-ioremap range spans multiple pgds, for which
+ * we are not prepared:
+ */
+ if (pgd != early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))) {
+ WARN_ON(1);
+ printk(KERN_WARNING "pgd %p != %p\n",
+ pgd, early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END)));
+ printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
+ fix_to_virt(FIX_BTMAP_BEGIN));
+ printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n",
+ fix_to_virt(FIX_BTMAP_END));
+
+ printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
+ printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n",
+ FIX_BTMAP_BEGIN);
+ }
+}
+
+void __init early_ioremap_clear(void)
+{
+ unsigned long *pgd;
+
+ if (early_ioremap_debug)
+ printk(KERN_DEBUG "early_ioremap_clear()\n");
+
+ pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
+ *pgd = 0;
+ __flush_tlb_all();
+}
+
+void __init early_ioremap_reset(void)
+{
+ enum fixed_addresses idx;
+ unsigned long *pte, phys, addr;
+
+ after_paging_init = 1;
+ for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) {
+ addr = fix_to_virt(idx);
+ pte = early_ioremap_pte(addr);
+ if (!*pte & _PAGE_PRESENT) {
+ phys = *pte & PAGE_MASK;
+ set_fixmap(idx, phys);
+ }
+ }
+}
+
+static void __init __early_set_fixmap(enum fixed_addresses idx,
+ unsigned long phys, pgprot_t flags)
+{
+ unsigned long *pte, addr = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+ pte = early_ioremap_pte(addr);
+ if (pgprot_val(flags))
+ *pte = (phys & PAGE_MASK) | pgprot_val(flags);
+ else
+ *pte = 0;
+ __flush_tlb_one(addr);
+}
+
+static inline void __init early_set_fixmap(enum fixed_addresses idx,
+ unsigned long phys)
+{
+ if (after_paging_init)
+ set_fixmap(idx, phys);
+ else
+ __early_set_fixmap(idx, phys, PAGE_KERNEL);
+}
+
+static inline void __init early_clear_fixmap(enum fixed_addresses idx)
+{
+ if (after_paging_init)
+ clear_fixmap(idx);
+ else
+ __early_set_fixmap(idx, 0, __pgprot(0));
+}
+
+
+int __initdata early_ioremap_nested;
+
+static int __init check_early_ioremap_leak(void)
+{
+ if (!early_ioremap_nested)
+ return 0;
+
+ printk(KERN_WARNING
+ "Debug warning: early ioremap leak of %d areas detected.\n",
+ early_ioremap_nested);
+ printk(KERN_WARNING
+ "please boot with early_ioremap_debug and report the dmesg.\n");
+ WARN_ON(1);
+
+ return 1;
+}
+late_initcall(check_early_ioremap_leak);
+
+void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
+{
+ unsigned long offset, last_addr;
+ unsigned int nrpages, nesting;
+ enum fixed_addresses idx0, idx;
+
+ WARN_ON(system_state != SYSTEM_BOOTING);
+
+ nesting = early_ioremap_nested;
+ if (early_ioremap_debug) {
+ printk(KERN_DEBUG "early_ioremap(%08lx, %08lx) [%d] => ",
+ phys_addr, size, nesting);
+ dump_stack();
+ }
+
+ /* Don't allow wraparound or zero size */
+ last_addr = phys_addr + size - 1;
+ if (!size || last_addr < phys_addr) {
+ WARN_ON(1);
+ return NULL;
+ }
+
+ if (nesting >= FIX_BTMAPS_NESTING) {
+ WARN_ON(1);
+ return NULL;
+ }
+ early_ioremap_nested++;
+ /*
+ * Mappings have to be page-aligned
+ */
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr) - phys_addr;
+
+ /*
+ * Mappings have to fit in the FIX_BTMAP area.
+ */
+ nrpages = size >> PAGE_SHIFT;
+ if (nrpages > NR_FIX_BTMAPS) {
+ WARN_ON(1);
+ return NULL;
+ }
+
+ /*
+ * Ok, go for it..
+ */
+ idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
+ idx = idx0;
+ while (nrpages > 0) {
+ early_set_fixmap(idx, phys_addr);
+ phys_addr += PAGE_SIZE;
+ --idx;
+ --nrpages;
+ }
+ if (early_ioremap_debug)
+ printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
+
+ return (void *) (offset + fix_to_virt(idx0));
+}
+
+void __init early_iounmap(void *addr, unsigned long size)
+{
+ unsigned long virt_addr;
+ unsigned long offset;
+ unsigned int nrpages;
+ enum fixed_addresses idx;
+ unsigned int nesting;
+
+ nesting = --early_ioremap_nested;
+ WARN_ON(nesting < 0);
+
+ if (early_ioremap_debug) {
+ printk(KERN_DEBUG "early_iounmap(%p, %08lx) [%d]\n", addr,
+ size, nesting);
+ dump_stack();
+ }
+
+ virt_addr = (unsigned long)addr;
+ if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) {
+ WARN_ON(1);
+ return;
+ }
+ offset = virt_addr & ~PAGE_MASK;
+ nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;
+
+ idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
+ while (nrpages > 0) {
+ early_clear_fixmap(idx);
+ --idx;
+ --nrpages;
+ }
+}
+
+void __this_fixmap_does_not_exist(void)
+{
+ WARN_ON(1);
+}
+
+#endif /* CONFIG_X86_32 */
projects / linux-2.6 / commitdiff