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x86: use early_ioremap in __acpi_map_table 

__acpi_map_table() effectively reimplements early_ioremap().  Rather
than have that duplication, just implement it in terms of
early_ioremap().

However, unlike early_ioremap(), __acpi_map_table() just maintains a
single mapping which gets replaced each call, and has no corresponding
unmap function.  Implement this by just removing the previous mapping
each time its called.  Unfortunately, this will leave a stray mapping
at the end.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-07 15:39:38 -08:00 committed by Ingo Molnar
parent d5b562330e
commit 1c14fa4937
4 changed files with 7 additions and 31 deletions
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3
arch/x86/include/asm/acpi.h
View File

@ -102,9 +102,6 @@ static inline void disable_acpi(void)
acpi_noirq = 1;
}
/* Fixmap pages to reserve for ACPI boot-time tables (see fixmap.h) */
#define FIX_ACPI_PAGES 4
extern int acpi_gsi_to_irq(u32 gsi, unsigned int *irq);
static inline void acpi_noirq_set(void) { acpi_noirq = 1; }

4
arch/x86/include/asm/fixmap_32.h
View File

@ -95,10 +95,6 @@ enum fixed_addresses {
(__end_of_permanent_fixed_addresses & 255),
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1,
FIX_WP_TEST,
#ifdef CONFIG_ACPI
FIX_ACPI_BEGIN,
FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
#endif
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE,
#endif

4
arch/x86/include/asm/fixmap_64.h
View File

@ -50,10 +50,6 @@ enum fixed_addresses {
FIX_PARAVIRT_BOOTMAP,
#endif
__end_of_permanent_fixed_addresses,
#ifdef CONFIG_ACPI
FIX_ACPI_BEGIN,
FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
#endif
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE,
#endif

27
arch/x86/kernel/acpi/boot.c
View File

@ -121,8 +121,8 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
*/
char *__init __acpi_map_table(unsigned long phys, unsigned long size)
{
unsigned long base, offset, mapped_size;
int idx;
static char *prev_map;
static unsigned long prev_size;
if (!phys || !size)
return NULL;
@ -130,26 +130,13 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
if (phys+size <= (max_low_pfn_mapped << PAGE_SHIFT))
return __va(phys);
offset = phys & (PAGE_SIZE - 1);
mapped_size = PAGE_SIZE - offset;
clear_fixmap(FIX_ACPI_END);
set_fixmap(FIX_ACPI_END, phys);
base = fix_to_virt(FIX_ACPI_END);
if (prev_map)
early_iounmap(prev_map, prev_size);
/*
* Most cases can be covered by the below.
*/
idx = FIX_ACPI_END;
while (mapped_size < size) {
if (--idx < FIX_ACPI_BEGIN)
return NULL; /* cannot handle this */
phys += PAGE_SIZE;
clear_fixmap(idx);
set_fixmap(idx, phys);
mapped_size += PAGE_SIZE;
}
prev_size = size;
prev_map = early_ioremap(phys, size);
return ((unsigned char *)base + offset);
return prev_map;
}
#ifdef CONFIG_PCI_MMCONFIG