[POWERPC] Revise PPC44x MMU code for arch/powerpc

This patch takes the definitions for the PPC44x MMU (a software loaded
TLB) from asm-ppc/mmu.h, cleans them up of things no longer necessary
in arch/powerpc and puts them in a new asm-powerpc/mmu_44x.h file.  It
also substantially simplifies arch/powerpc/mm/44x_mmu.c and makes a
couple of small fixes necessary for the 44x MMU code to build and work
properly in arch/powerpc.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/include/asm-powerpc/mmu-44x.h b/include/asm-powerpc/mmu-44x.h
new file mode 100644
index 000000000000..7bbc37e27d3c
--- /dev/null
+++ b/include/asm-powerpc/mmu-44x.h
@@ -0,0 +1,72 @@
+#ifndef _ASM_POWERPC_MMU_44X_H_
+#define _ASM_POWERPC_MMU_44X_H_
+/*
+ * PPC440 support
+ */
+
+#define PPC44x_MMUCR_TID        0x000000ff
+#define PPC44x_MMUCR_STS        0x00010000
+
+#define PPC44x_TLB_PAGEID       0
+#define PPC44x_TLB_XLAT         1
+#define PPC44x_TLB_ATTRIB       2
+
+/* Page identification fields */
+#define PPC44x_TLB_EPN_MASK     0xfffffc00      /* Effective Page Number */
+#define PPC44x_TLB_VALID        0x00000200      /* Valid flag */
+#define PPC44x_TLB_TS           0x00000100      /* Translation address space */
+#define PPC44x_TLB_1K           0x00000000      /* Page sizes */
+#define PPC44x_TLB_4K           0x00000010
+#define PPC44x_TLB_16K          0x00000020
+#define PPC44x_TLB_64K          0x00000030
+#define PPC44x_TLB_256K         0x00000040
+#define PPC44x_TLB_1M           0x00000050
+#define PPC44x_TLB_16M          0x00000070
+#define PPC44x_TLB_256M         0x00000090
+
+/* Translation fields */
+#define PPC44x_TLB_RPN_MASK     0xfffffc00      /* Real Page Number */
+#define PPC44x_TLB_ERPN_MASK    0x0000000f
+
+/* Storage attribute and access control fields */
+#define PPC44x_TLB_ATTR_MASK    0x0000ff80
+#define PPC44x_TLB_U0           0x00008000      /* User 0 */
+#define PPC44x_TLB_U1           0x00004000      /* User 1 */
+#define PPC44x_TLB_U2           0x00002000      /* User 2 */
+#define PPC44x_TLB_U3           0x00001000      /* User 3 */
+#define PPC44x_TLB_W            0x00000800      /* Caching is write-through */
+#define PPC44x_TLB_I            0x00000400      /* Caching is inhibited */
+#define PPC44x_TLB_M            0x00000200      /* Memory is coherent */
+#define PPC44x_TLB_G            0x00000100      /* Memory is guarded */
+#define PPC44x_TLB_E            0x00000080      /* Memory is guarded */
+
+#define PPC44x_TLB_PERM_MASK    0x0000003f
+#define PPC44x_TLB_UX           0x00000020      /* User execution */
+#define PPC44x_TLB_UW           0x00000010      /* User write */
+#define PPC44x_TLB_UR           0x00000008      /* User read */
+#define PPC44x_TLB_SX           0x00000004      /* Super execution */
+#define PPC44x_TLB_SW           0x00000002      /* Super write */
+#define PPC44x_TLB_SR           0x00000001      /* Super read */
+
+/* Number of TLB entries */
+#define PPC44x_TLB_SIZE         64
+
+#ifndef __ASSEMBLY__
+
+typedef unsigned long long phys_addr_t;
+
+extern phys_addr_t fixup_bigphys_addr(phys_addr_t, phys_addr_t);
+
+typedef struct {
+        unsigned long id;
+        unsigned long vdso_base;
+} mm_context_t;
+
+#endif /* !__ASSEMBLY__ */
+
+#define PPC44x_EARLY_TLBS       1
+
+/* Size of the TLBs used for pinning in lowmem */
+#define PPC_PIN_SIZE    (1 << 28)       /* 256M */
+
+#endif /* _ASM_POWERPC_MMU_44X_H_ */