[PATCH 6 of 7] x86: use early_ioremap in __acpi_map_table

Jeremy Fitzhardinge
2008-09-07T22:26:33Z

__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>
---
arch/x86/kernel/acpi/boot.c | 27 +++++++--------------------
include/asm-x86/acpi.h | 3 ---
include/asm-x86/fixmap_32.h | 4 ----
include/asm-x86/fixmap_64.h | 4 ----
4 files changed, 7 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -121,8 +121,8 @@
*/
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 @@
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
diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h
--- a/include/asm-x86/acpi.h
+++ b/include/asm-x86/acpi.h
@@ -102,9 +102,6 @@
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; }
diff --git a/include/asm-x86/fixmap_32.h b/include/asm-x86/fixmap_32.h
--- a/include/asm-x86/fixmap_32.h
+++ b/include/asm-x86/fixmap_32.h
@@ -99,10 +99,6 @@
(__end_of_permanent_fixed_addresses & 255),
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 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
diff --git a/include/asm-x86/fixmap_64.h b/include/asm-x86/fixmap_64.h
--- a/include/asm-x86/fixmap_64.h
+++ b/include/asm-x86/fixmap_64.h
@@ -50,10 +50,6 @@
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