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x86, 64-bit: unify early_ioremap 

The 32-bit early_ioremap will work equally well for 64-bit, so just use it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-06-25 00:19:03 -04:00 committed by Ingo Molnar
parent bb23e403e5
commit 4583ed514e
5 changed files with 27 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
arch/x86/mm/init_64.c
View File

@ -257,58 +257,6 @@ static __meminit void unmap_low_page(void *adr)
early_iounmap(adr, PAGE_SIZE);
}
/* Must run before zap_low_mappings */
__meminit void *early_ioremap(unsigned long addr, unsigned long size)
{
pmd_t *pmd, *last_pmd;
unsigned long vaddr;
int i, pmds;
pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
vaddr = __START_KERNEL_map;
pmd = level2_kernel_pgt;
last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
for (i = 0; i < pmds; i++) {
if (pmd_present(pmd[i]))
goto continue_outer_loop;
}
vaddr += addr & ~PMD_MASK;
addr &= PMD_MASK;
for (i = 0; i < pmds; i++, addr += PMD_SIZE)
set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
__flush_tlb_all();
return (void *)vaddr;
continue_outer_loop:
;
}
printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size);
return NULL;
}
/*
* To avoid virtual aliases later:
*/
__meminit void early_iounmap(void *addr, unsigned long size)
{
unsigned long vaddr;
pmd_t *pmd;
int i, pmds;
vaddr = (unsigned long)addr;
pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
pmd = level2_kernel_pgt + pmd_index(vaddr);
for (i = 0; i < pmds; i++)
pmd_clear(pmd + i);
__flush_tlb_all();
}
static unsigned long __meminit
phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
{

5
arch/x86/mm/ioremap.c
View File

@ -381,8 +381,6 @@ void unxlate_dev_mem_ptr(unsigned long phys, void *addr)
return;
}
#ifdef CONFIG_X86_32
int __initdata early_ioremap_debug;
static int __init early_ioremap_debug_setup(char *str)
@ -483,6 +481,7 @@ static void __init __early_set_fixmap(enum fixed_addresses idx,
return;
}
pte = early_ioremap_pte(addr);
if (pgprot_val(flags))
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
else
@ -624,5 +623,3 @@ void __this_fixmap_does_not_exist(void)
{
WARN_ON(1);
}
#endif /* CONFIG_X86_32 */

13
include/asm-x86/fixmap_64.h
View File

@ -49,6 +49,19 @@ enum fixed_addresses {
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE,
#endif
__end_of_permanent_fixed_addresses,
/*
* 256 temporary boot-time mappings, used by early_ioremap(),
* before ioremap() is functional.
*
* We round it up to the next 512 pages boundary so that we
* can have a single pgd entry and a single pte table:
*/
#define NR_FIX_BTMAPS 64
#define FIX_BTMAPS_NESTING 4
FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
(__end_of_permanent_fixed_addresses & 511),
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
__end_of_fixed_addresses
};

13
include/asm-x86/io.h
View File

@ -72,4 +72,17 @@ extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
unsigned long prot_val);
extern void __iomem *ioremap_wc(unsigned long offset, unsigned long size);
/*
* early_ioremap() and early_iounmap() are for temporary early boot-time
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
*/
extern void early_ioremap_init(void);
extern void early_ioremap_clear(void);
extern void early_ioremap_reset(void);
extern void *early_ioremap(unsigned long offset, unsigned long size);
extern void early_iounmap(void *addr, unsigned long size);
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
#endif /* _ASM_X86_IO_H */

12
include/asm-x86/io_32.h
View File

@ -121,18 +121,6 @@ static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
extern void iounmap(volatile void __iomem *addr);
/*
* early_ioremap() and early_iounmap() are for temporary early boot-time
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
*/
extern void early_ioremap_init(void);
extern void early_ioremap_clear(void);
extern void early_ioremap_reset(void);
extern void *early_ioremap(unsigned long offset, unsigned long size);
extern void early_iounmap(void *addr, unsigned long size);
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
/*
* ISA I/O bus memory addresses are 1:1 with the physical address.
*/