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x86: not overmap more than the end of RAM in init_memory_mapping - 64bit

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handle head and tail that are not aligned to big pages (2MB/1GB boundary).

with this patch, on system that support gbpages, change:

  last_map_addr: 1080000000 end: 1078000000

to:

  last_map_addr: 1078000000 end: 1078000000

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-07-08 01:43:27 -07:00 committed by Ingo Molnar
parent 2dc807b37b
commit c2e6d65bce
1 changed files with 65 additions and 12 deletions
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77
arch/x86/mm/init_64.c
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@ -462,18 +462,25 @@ phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
static void __init find_early_table_space(unsigned long end)
{
unsigned long puds, tables, start;
unsigned long puds, pmds, ptes, tables, start;
puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
tables = round_up(puds * sizeof(pud_t), PAGE_SIZE);
if (!direct_gbpages) {
unsigned long pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
}
if (!cpu_has_pse) {
unsigned long ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE);
}
if (direct_gbpages) {
unsigned long extra;
extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
} else
pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
if (cpu_has_pse) {
unsigned long extra;
extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
} else
ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE);
/*
* RED-PEN putting page tables only on node 0 could
@ -660,8 +667,9 @@ static unsigned long __init kernel_physical_mapping_init(unsigned long start,
unsigned long __init_refok init_memory_mapping(unsigned long start,
unsigned long end)
{
unsigned long last_map_addr;
unsigned long last_map_addr = end;
unsigned long page_size_mask = 0;
unsigned long start_pfn, end_pfn;
printk(KERN_INFO "init_memory_mapping\n");
@ -682,8 +690,53 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
if (cpu_has_pse)
page_size_mask |= 1 << PG_LEVEL_2M;
last_map_addr = kernel_physical_mapping_init(start, end,
page_size_mask);
/* head if not big page aligment ?*/
start_pfn = start >> PAGE_SHIFT;
end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT)
<< (PMD_SHIFT - PAGE_SHIFT);
if (start_pfn < end_pfn)
last_map_addr = kernel_physical_mapping_init(
start_pfn<<PAGE_SHIFT,
end_pfn<<PAGE_SHIFT, 0);
/* big page (2M) range*/
start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
<< (PMD_SHIFT - PAGE_SHIFT);
end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT)
<< (PUD_SHIFT - PAGE_SHIFT);
if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)))
end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT));
if (start_pfn < end_pfn)
last_map_addr = kernel_physical_mapping_init(
start_pfn<<PAGE_SHIFT,
end_pfn<<PAGE_SHIFT,
page_size_mask & (1<<PG_LEVEL_2M));
/* big page (1G) range */
start_pfn = end_pfn;
end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
if (start_pfn < end_pfn)
last_map_addr = kernel_physical_mapping_init(
start_pfn<<PAGE_SHIFT,
end_pfn<<PAGE_SHIFT,
page_size_mask & ((1<<PG_LEVEL_2M)
| (1<<PG_LEVEL_1G)));
/* tail is not big page (1G) alignment */
start_pfn = end_pfn;
end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
if (start_pfn < end_pfn)
last_map_addr = kernel_physical_mapping_init(
start_pfn<<PAGE_SHIFT,
end_pfn<<PAGE_SHIFT,
page_size_mask & (1<<PG_LEVEL_2M));
/* tail is not big page (2M) alignment */
start_pfn = end_pfn;
end_pfn = end>>PAGE_SHIFT;
if (start_pfn < end_pfn)
last_map_addr = kernel_physical_mapping_init(
start_pfn<<PAGE_SHIFT,
end_pfn<<PAGE_SHIFT, 0);
if (!after_bootmem)
mmu_cr4_features = read_cr4();