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In v4.2, look under arch/x86/:

include/asm/pgtable*
include/asm/page*
mm/pgtable*
mm/page*

There seems to be no structs defined to represent the pages, only macros: include/asm/page_types.h is specially interesting. Excerpt:

#define _PAGE_BIT_PRESENT   0   /* is present */
#define _PAGE_BIT_RW        1   /* writeable */
#define _PAGE_BIT_USER      2   /* userspace addressable */
#define _PAGE_BIT_PWT       3   /* page write through */

arch/x86/include/uapi/asm/processor-flags.h defines CR0, and in particular the PG bit position:

#define X86_CR0_PG_BIT      31 /* Paging */

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