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author | Yinghai Lu <yinghai@kernel.org> | 2012-11-17 03:38:58 (GMT) |
---|---|---|
committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 19:59:19 (GMT) |
commit | 8d57470d8f859635deffe3919d7d4867b488b85a (patch) | |
tree | 8576bb911f3f671952a6d2310b787e1ed55e4456 /arch/x86/include/asm | |
parent | f763ad1d3870abb811ec7520b4c1adc56471a3a4 (diff) | |
download | linux-fsl-qoriq-8d57470d8f859635deffe3919d7d4867b488b85a.tar.xz |
x86, mm: setup page table in top-down
Get pgt_buf early from BRK, and use it to map PMD_SIZE from top at first.
Then use mapped pages to map more ranges below, and keep looping until
all pages get mapped.
alloc_low_page will use page from BRK at first, after that buffer is used
up, will use memblock to find and reserve pages for page table usage.
Introduce min_pfn_mapped to make sure find new pages from mapped ranges,
that will be updated when lower pages get mapped.
Also add step_size to make sure that don't try to map too big range with
limited mapped pages initially, and increase the step_size when we have
more mapped pages on hand.
We don't need to call pagetable_reserve anymore, reserve work is done
in alloc_low_page() directly.
At last we can get rid of calculation and find early pgt related code.
-v2: update to after fix_xen change,
also use MACRO for initial pgt_buf size and add comments with it.
-v3: skip big reserved range in memblock.reserved near end.
-v4: don't need fix_xen change now.
-v5: add changelog about moving about reserving pagetable to alloc_low_page.
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-22-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r-- | arch/x86/include/asm/page_types.h | 1 | ||||
-rw-r--r-- | arch/x86/include/asm/pgtable.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h index 54c9787..9f6f3e6 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -45,6 +45,7 @@ extern int devmem_is_allowed(unsigned long pagenr); extern unsigned long max_low_pfn_mapped; extern unsigned long max_pfn_mapped; +extern unsigned long min_pfn_mapped; static inline phys_addr_t get_max_mapped(void) { diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index dd1a888..6991a3e 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -603,6 +603,7 @@ static inline int pgd_none(pgd_t pgd) extern int direct_gbpages; void init_mem_mapping(void); +void early_alloc_pgt_buf(void); /* local pte updates need not use xchg for locking */ static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) |