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linux-sg2042
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x86: make max_pfn cover acpi table below 4g 

When system have 4g less ram installed, and acpi table sit
near end of ram, make max_pfn cover them too,
so 64bit kernel don't need to mess up fixmap.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: "Suresh Siddha" <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-07-08 18:56:38 -07:00 committed by Ingo Molnar
parent 49c980df55
commit 2dc807b37b
3 changed files with 16 additions and 17 deletions
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18
arch/x86/kernel/e820.c
View File

@ -1056,12 +1056,20 @@ unsigned long __initdata end_user_pfn = MAX_ARCH_PFN;
/*
* Find the highest page frame number we have available
*/
unsigned long __init e820_end_of_ram(void)
unsigned long __init e820_end(void)
{
unsigned long last_pfn;
int i;
unsigned long last_pfn = 0;
unsigned long max_arch_pfn = MAX_ARCH_PFN;
last_pfn = find_max_pfn_with_active_regions();
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
unsigned long end_pfn;
end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
if (end_pfn > last_pfn)
last_pfn = end_pfn;
}
if (last_pfn > max_arch_pfn)
last_pfn = max_arch_pfn;
@ -1192,9 +1200,7 @@ static int __init parse_memmap_opt(char *p)
* the real mem size before original memory map is
* reset.
*/
e820_register_active_regions(0, 0, -1UL);
saved_max_pfn = e820_end_of_ram();
remove_all_active_ranges();
saved_max_pfn = e820_end();
#endif
e820.nr_map = 0;
userdef = 1;

13
arch/x86/kernel/setup.c
View File

@ -709,22 +709,18 @@ void __init setup_arch(char **cmdline_p)
early_gart_iommu_check();
#endif
e820_register_active_regions(0, 0, -1UL);
/*
* partially used pages are not usable - thus
* we are rounding upwards:
*/
max_pfn = e820_end_of_ram();
max_pfn = e820_end();
/* preallocate 4k for mptable mpc */
early_reserve_e820_mpc_new();
/* update e820 for memory not covered by WB MTRRs */
mtrr_bp_init();
if (mtrr_trim_uncached_memory(max_pfn)) {
remove_all_active_ranges();
e820_register_active_regions(0, 0, -1UL);
max_pfn = e820_end_of_ram();
}
if (mtrr_trim_uncached_memory(max_pfn))
max_pfn = e820_end();
#ifdef CONFIG_X86_32
/* max_low_pfn get updated here */
@ -767,9 +763,6 @@ void __init setup_arch(char **cmdline_p)
*/
acpi_boot_table_init();
/* Remove active ranges so rediscovery with NUMA-awareness happens */
remove_all_active_ranges();
#ifdef CONFIG_ACPI_NUMA
/*
* Parse SRAT to discover nodes.

2
include/asm-x86/e820.h
View File

@ -99,7 +99,7 @@ extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
extern unsigned long e820_end_of_ram(void);
extern unsigned long e820_end(void);
extern int e820_find_active_region(const struct e820entry *ei,
unsigned long start_pfn,
unsigned long last_pfn,