powerpc: Add memory management headers for new 64-bit BookE

This adds the PTE and pgtable format definitions, along with changes
to the kernel memory map and other definitions related to implementing
support for 64-bit Book3E. This also shields some asm-offset bits that
are currently only relevant on 32-bit

We also move the definition of the "linux" page size constants to
the common mmu.h file and add a few sizes that are relevant to
embedded processors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/pte-book3e.h b/arch/powerpc/include/asm/pte-book3e.h
new file mode 100644
index 000000000000..1d27c77d7704
--- /dev/null
+++ b/arch/powerpc/include/asm/pte-book3e.h
@@ -0,0 +1,70 @@
+#ifndef _ASM_POWERPC_PTE_BOOK3E_H
+#define _ASM_POWERPC_PTE_BOOK3E_H
+#ifdef __KERNEL__
+
+/* PTE bit definitions for processors compliant to the Book3E
+ * architecture 2.06 or later. The position of the PTE bits
+ * matches the HW definition of the optional Embedded Page Table
+ * category.
+ */
+
+/* Architected bits */
+#define _PAGE_PRESENT   0x000001 /* software: pte contains a translation */
+#define _PAGE_FILE      0x000002 /* (!present only) software: pte holds file offset */
+#define _PAGE_SW1       0x000002
+#define _PAGE_BAP_SR    0x000004
+#define _PAGE_BAP_UR    0x000008
+#define _PAGE_BAP_SW    0x000010
+#define _PAGE_BAP_UW    0x000020
+#define _PAGE_BAP_SX    0x000040
+#define _PAGE_BAP_UX    0x000080
+#define _PAGE_PSIZE_MSK 0x000f00
+#define _PAGE_PSIZE_4K  0x000200
+#define _PAGE_PSIZE_64K 0x000600
+#define _PAGE_PSIZE_1M  0x000a00
+#define _PAGE_PSIZE_16M 0x000e00
+#define _PAGE_DIRTY     0x001000 /* C: page changed */
+#define _PAGE_SW0       0x002000
+#define _PAGE_U3        0x004000
+#define _PAGE_U2        0x008000
+#define _PAGE_U1        0x010000
+#define _PAGE_U0        0x020000
+#define _PAGE_ACCESSED  0x040000
+#define _PAGE_LENDIAN   0x080000
+#define _PAGE_GUARDED   0x100000
+#define _PAGE_COHERENT  0x200000 /* M: enforce memory coherence */
+#define _PAGE_NO_CACHE  0x400000 /* I: cache inhibit */
+#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */
+
+/* "Higher level" linux bit combinations */
+#define _PAGE_EXEC      _PAGE_BAP_SX /* Can be executed from potentially */
+#define _PAGE_HWEXEC    _PAGE_BAP_UX /* .. and was cache cleaned */
+#define _PAGE_RW        (_PAGE_BAP_SW | _PAGE_BAP_UW) /* User write permission */
+#define _PAGE_KERNEL_RW (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY)
+#define _PAGE_KERNEL_RO (_PAGE_BAP_SR)
+#define _PAGE_USER      (_PAGE_BAP_UR | _PAGE_BAP_SR) /* Can be read */
+
+#define _PAGE_HASHPTE   0
+#define _PAGE_BUSY      0
+
+#define _PAGE_SPECIAL   _PAGE_SW0
+
+/* Flags to be preserved on PTE modifications */
+#define _PAGE_HPTEFLAGS _PAGE_BUSY
+
+/* Base page size */
+#ifdef CONFIG_PPC_64K_PAGES
+#define _PAGE_PSIZE     _PAGE_PSIZE_64K
+#define PTE_RPN_SHIFT   (28)
+#else
+#define _PAGE_PSIZE     _PAGE_PSIZE_4K
+#define PTE_RPN_SHIFT   (24)
+#endif
+
+/* On 32-bit, we never clear the top part of the PTE */
+#ifdef CONFIG_PPC32
+#define _PTE_NONE_MASK  0xffffffff00000000ULL
+#endif
+
+#endif /* __KERNEL__ */
+#endif /*  _ASM_POWERPC_PTE_FSL_BOOKE_H */