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Subject[PATCH 2/3] x86: remove bios data range from e820
From: Yinghai Lu <yinghai@kernel.org>

To prepare move page_is_ram() as generic one.

Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/kernel/e820.c | 8 ++++++++
arch/x86/kernel/setup.c | 19 ++++++++++++++++++-
arch/x86/mm/ioremap.c | 16 ----------------
3 files changed, 26 insertions(+), 17 deletions(-)

--- linux-mm.orig/arch/x86/kernel/setup.c 2010-01-22 11:20:33.000000000 +0800
+++ linux-mm/arch/x86/kernel/setup.c 2010-01-22 11:20:37.000000000 +0800
@@ -659,6 +659,23 @@ static struct dmi_system_id __initdata b
{}
};

+static void __init trim_bios_range(void)
+{
+ /*
+ * A special case is the first 4Kb of memory;
+ * This is a BIOS owned area, not kernel ram, but generally
+ * not listed as such in the E820 table.
+ */
+ e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
+ /*
+ * special case: Some BIOSen report the PC BIOS
+ * area (640->1Mb) as ram even though it is not.
+ * take them out.
+ */
+ e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
+ sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+}
+
/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures
@@ -822,7 +839,7 @@ void __init setup_arch(char **cmdline_p)
insert_resource(&iomem_resource, &data_resource);
insert_resource(&iomem_resource, &bss_resource);

-
+ trim_bios_range();
#ifdef CONFIG_X86_32
if (ppro_with_ram_bug()) {
e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
--- linux-mm.orig/arch/x86/kernel/e820.c 2010-01-22 11:20:33.000000000 +0800
+++ linux-mm/arch/x86/kernel/e820.c 2010-01-22 11:20:37.000000000 +0800
@@ -517,11 +517,19 @@ u64 __init e820_remove_range(u64 start,
int checktype)
{
int i;
+ u64 end;
u64 real_removed_size = 0;

if (size > (ULLONG_MAX - start))
size = ULLONG_MAX - start;

+ end = start + size;
+ printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ",
+ (unsigned long long) start,
+ (unsigned long long) end);
+ e820_print_type(old_type);
+ printk(KERN_CONT "\n");
+
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 final_start, final_end;
--- linux-mm.orig/arch/x86/mm/ioremap.c 2010-01-22 11:20:33.000000000 +0800
+++ linux-mm/arch/x86/mm/ioremap.c 2010-01-22 11:20:37.000000000 +0800
@@ -29,22 +29,6 @@ int page_is_ram(unsigned long pagenr)
resource_size_t addr, end;
int i;

- /*
- * A special case is the first 4Kb of memory;
- * This is a BIOS owned area, not kernel ram, but generally
- * not listed as such in the E820 table.
- */
- if (pagenr == 0)
- return 0;
-
- /*
- * Second special case: Some BIOSen report the PC BIOS
- * area (640->1Mb) as ram even though it is not.
- */
- if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) &&
- pagenr < (BIOS_END >> PAGE_SHIFT))
- return 0;
-
for (i = 0; i < e820.nr_map; i++) {
/*
* Not usable memory:



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