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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** Paging on AMD64
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 *
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 * The space is divided in positive numbers - userspace and
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 * negative numbers - kernel space. The 'negative' space starting
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 * with 0xffff800000000000 and ending with 0xffffffff80000000
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 * (-2GB) is identically mapped physical memory. The area
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 * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
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 * mapped first 2GB.
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 *
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 * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
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 */
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#ifndef __amd64_PAGE_H__
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#ifndef __amd64_PAGE_H__
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#define __amd64_PAGE_H__
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#define __amd64_PAGE_H__
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#include <arch/mm/frame.h>
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#include <arch/mm/frame.h>
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#  include <mm/page.h>
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#  include <mm/page.h>
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#  include <arch/types.h>
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#  include <arch/types.h>
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#endif
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#endif
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#ifndef __ASM__
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#ifndef __ASM__
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static inline __address ka2pa(__address x)
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{
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    if (x > 0xffffffff80000000)
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        return x - 0xffffffff80000000;
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    else
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        return x - 0xffff800000000000;
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}
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/* Linker symbol */
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extern int ktext_start;
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extern int kdata_end;
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static inline __address pa2ka(__address x)
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{
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    if (x >= ka2pa((__address)(&kdata_end)) || \
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        x <= ka2pa((__address)&ktext_start))
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        return x + 0xffff800000000000;
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    else
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        return x + 0xffffffff80000000;
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}
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# define KA2PA(x)      ka2pa((__address)x)
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# define PA2KA(x)      pa2ka((__address)x)
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# define KA2PA(x)      (((__address) (x)) - 0xffffffff80000000)
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# define PA2KA_IDENT(x)      (((__address) (x)) + 0xffff800000000000)
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# define PA2KA(x)      (((__address) (x)) + 0xffffffff80000000)
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# define PA2KA_CODE(x)      (((__address) (x)) + 0xffffffff80000000)
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#else
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#else
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# define KA2PA(x)      ((x) - 0xffffffff80000000)
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# define KA2PA(x)      ((x) - 0xffffffff80000000)
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# define PA2KA(x)      ((x) + 0xffffffff80000000)
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# define PA2KA(x)      ((x) + 0xffffffff80000000)
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# define PA2KA_DATA(x)      ((x) + 0xffff800000000000)
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#endif
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#endif
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#define PTL0_ENTRIES_ARCH   512
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#define PTL0_ENTRIES_ARCH   512
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#define PTL1_ENTRIES_ARCH   512
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#define PTL1_ENTRIES_ARCH   512
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#define PTL2_ENTRIES_ARCH   512
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#define PTL2_ENTRIES_ARCH   512