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x86: unify ioremap 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:34:05 +01:00 committed by Ingo Molnar
parent e4c1b977f0
commit 240d3a7c47
2 changed files with 311 additions and 20 deletions
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18
arch/x86/mm/ioremap_32.c
View File

@ -19,6 +19,18 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_X86_64
unsigned long __phys_addr(unsigned long x)
{
if (x >= __START_KERNEL_map)
return x - __START_KERNEL_map + phys_base;
return x - PAGE_OFFSET;
}
EXPORT_SYMBOL(__phys_addr);
#endif
/*
* Fix up the linear direct mapping of the kernel to avoid cache attribute
* conflicts.
@ -49,6 +61,7 @@ static int ioremap_change_attr(unsigned long phys_addr, unsigned long size,
* memmap entry.
*/
err = change_page_attr_addr(vaddr, npages, prot);
if (!err)
global_flush_tlb();
@ -83,6 +96,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
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..
*/
@ -98,6 +112,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
if (!PageReserved(page))
return NULL;
}
#endif
pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags);
@ -211,6 +226,7 @@ void iounmap(volatile void __iomem *addr)
}
EXPORT_SYMBOL(iounmap);
#ifdef CONFIG_X86_32
int __initdata early_ioremap_debug;
@ -443,3 +459,5 @@ void __this_fixmap_does_not_exist(void)
{
WARN_ON(1);
}
#endif /* CONFIG_X86_32 */

313
arch/x86/mm/ioremap_64.c
View File

@ -6,6 +6,7 @@
* (C) Copyright 1995 1996 Linus Torvalds
*/
#include <linux/bootmem.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
@ -18,6 +19,8 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_X86_64
unsigned long __phys_addr(unsigned long x)
{
if (x >= __START_KERNEL_map)
@ -26,6 +29,8 @@ unsigned long __phys_addr(unsigned long x)
}
EXPORT_SYMBOL(__phys_addr);
#endif
/*
* Fix up the linear direct mapping of the kernel to avoid cache attribute
* conflicts.
@ -33,28 +38,33 @@ EXPORT_SYMBOL(__phys_addr);
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;
unsigned long npages, vaddr, last_addr = phys_addr + size - 1;
int err, 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);
/* 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();
if (!err)
global_flush_tlb();
}
return err;
}
@ -86,7 +96,26 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
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
*/
@ -107,10 +136,12 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
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);
@ -154,12 +185,19 @@ void iounmap(volatile void __iomem *addr)
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
@ -188,3 +226,238 @@ void iounmap(volatile void __iomem *addr)
}
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 */