diff options
Diffstat (limited to 'arch/x86/mm/pgtable.c')
| -rw-r--r-- | arch/x86/mm/pgtable.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 3feec5af4e67..27d218b38538 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -346,12 +346,38 @@ static inline void _pgd_free(pgd_t *pgd) #else static inline pgd_t *_pgd_alloc(void) { +#ifdef CONFIG_KAISER + // Instead of one PML4, we aquire two PML4s and, thus, an 8kb-aligned memory + // block. Therefore, we have to allocate at least 3 pages. However, the + // __get_free_pages returns us 4 pages. Hence, we store the base pointer at + // the beginning of the page of our 8kb-aligned memory block in order to + // correctly free it afterwars. + + unsigned long pages = __get_free_pages(PGALLOC_GFP, get_order(4*PAGE_SIZE)); + + if(native_get_normal_pgd((pgd_t*) pages) == (pgd_t*) pages) + { + *((unsigned long*)(pages + 2 * PAGE_SIZE)) = pages; + return (pgd_t *) pages; + } + else + { + *((unsigned long*)(pages + 3 * PAGE_SIZE)) = pages; + return (pgd_t *) (pages + PAGE_SIZE); + } +#else return (pgd_t *)__get_free_page(PGALLOC_GFP); +#endif } static inline void _pgd_free(pgd_t *pgd) { +#ifdef CONFIG_KAISER + unsigned long pages = *((unsigned long*) ((char*) pgd + 2 * PAGE_SIZE)); + free_pages(pages, get_order(4*PAGE_SIZE)); +#else free_page((unsigned long)pgd); +#endif } #endif /* CONFIG_X86_PAE */ |