v4.19.13 snapshot.
diff --git a/arch/powerpc/include/asm/mmu-44x.h b/arch/powerpc/include/asm/mmu-44x.h
new file mode 100644
index 0000000..295b3db
--- /dev/null
+++ b/arch/powerpc/include/asm/mmu-44x.h
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_MMU_44X_H_
+#define _ASM_POWERPC_MMU_44X_H_
+/*
+ * PPC440 support
+ */
+
+#include <asm/asm-const.h>
+
+#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 little endian */
+
+#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
+
+/* 47x bits */
+#define PPC47x_MMUCR_TID 0x0000ffff
+#define PPC47x_MMUCR_STS 0x00010000
+
+/* Page identification fields */
+#define PPC47x_TLB0_EPN_MASK 0xfffff000 /* Effective Page Number */
+#define PPC47x_TLB0_VALID 0x00000800 /* Valid flag */
+#define PPC47x_TLB0_TS 0x00000400 /* Translation address space */
+#define PPC47x_TLB0_4K 0x00000000
+#define PPC47x_TLB0_16K 0x00000010
+#define PPC47x_TLB0_64K 0x00000030
+#define PPC47x_TLB0_1M 0x00000070
+#define PPC47x_TLB0_16M 0x000000f0
+#define PPC47x_TLB0_256M 0x000001f0
+#define PPC47x_TLB0_1G 0x000003f0
+#define PPC47x_TLB0_BOLTED_R 0x00000008 /* tlbre only */
+
+/* Translation fields */
+#define PPC47x_TLB1_RPN_MASK 0xfffff000 /* Real Page Number */
+#define PPC47x_TLB1_ERPN_MASK 0x000003ff
+
+/* Storage attribute and access control fields */
+#define PPC47x_TLB2_ATTR_MASK 0x0003ff80
+#define PPC47x_TLB2_IL1I 0x00020000 /* Memory is guarded */
+#define PPC47x_TLB2_IL1D 0x00010000 /* Memory is guarded */
+#define PPC47x_TLB2_U0 0x00008000 /* User 0 */
+#define PPC47x_TLB2_U1 0x00004000 /* User 1 */
+#define PPC47x_TLB2_U2 0x00002000 /* User 2 */
+#define PPC47x_TLB2_U3 0x00001000 /* User 3 */
+#define PPC47x_TLB2_W 0x00000800 /* Caching is write-through */
+#define PPC47x_TLB2_I 0x00000400 /* Caching is inhibited */
+#define PPC47x_TLB2_M 0x00000200 /* Memory is coherent */
+#define PPC47x_TLB2_G 0x00000100 /* Memory is guarded */
+#define PPC47x_TLB2_E 0x00000080 /* Memory is little endian */
+#define PPC47x_TLB2_PERM_MASK 0x0000003f
+#define PPC47x_TLB2_UX 0x00000020 /* User execution */
+#define PPC47x_TLB2_UW 0x00000010 /* User write */
+#define PPC47x_TLB2_UR 0x00000008 /* User read */
+#define PPC47x_TLB2_SX 0x00000004 /* Super execution */
+#define PPC47x_TLB2_SW 0x00000002 /* Super write */
+#define PPC47x_TLB2_SR 0x00000001 /* Super read */
+#define PPC47x_TLB2_U_RWX (PPC47x_TLB2_UX|PPC47x_TLB2_UW|PPC47x_TLB2_UR)
+#define PPC47x_TLB2_S_RWX (PPC47x_TLB2_SX|PPC47x_TLB2_SW|PPC47x_TLB2_SR)
+#define PPC47x_TLB2_S_RW (PPC47x_TLB2_SW | PPC47x_TLB2_SR)
+#define PPC47x_TLB2_IMG (PPC47x_TLB2_I | PPC47x_TLB2_M | PPC47x_TLB2_G)
+
+#ifndef __ASSEMBLY__
+
+extern unsigned int tlb_44x_hwater;
+extern unsigned int tlb_44x_index;
+
+typedef struct {
+ unsigned int id;
+ unsigned int active;
+ unsigned long vdso_base;
+} mm_context_t;
+
+#endif /* !__ASSEMBLY__ */
+
+#ifndef CONFIG_PPC_EARLY_DEBUG_44x
+#define PPC44x_EARLY_TLBS 1
+#else
+#define PPC44x_EARLY_TLBS 2
+#define PPC44x_EARLY_DEBUG_VIRTADDR (ASM_CONST(0xf0000000) \
+ | (ASM_CONST(CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW) & 0xffff))
+#endif
+
+/* Size of the TLBs used for pinning in lowmem */
+#define PPC_PIN_SIZE (1 << 28) /* 256M */
+
+#if defined(CONFIG_PPC_4K_PAGES)
+#define PPC44x_TLBE_SIZE PPC44x_TLB_4K
+#define PPC47x_TLBE_SIZE PPC47x_TLB0_4K
+#define mmu_virtual_psize MMU_PAGE_4K
+#elif defined(CONFIG_PPC_16K_PAGES)
+#define PPC44x_TLBE_SIZE PPC44x_TLB_16K
+#define PPC47x_TLBE_SIZE PPC47x_TLB0_16K
+#define mmu_virtual_psize MMU_PAGE_16K
+#elif defined(CONFIG_PPC_64K_PAGES)
+#define PPC44x_TLBE_SIZE PPC44x_TLB_64K
+#define PPC47x_TLBE_SIZE PPC47x_TLB0_64K
+#define mmu_virtual_psize MMU_PAGE_64K
+#elif defined(CONFIG_PPC_256K_PAGES)
+#define PPC44x_TLBE_SIZE PPC44x_TLB_256K
+#define mmu_virtual_psize MMU_PAGE_256K
+#else
+#error "Unsupported PAGE_SIZE"
+#endif
+
+#define mmu_linear_psize MMU_PAGE_256M
+
+#define PPC44x_PGD_OFF_SHIFT (32 - PGDIR_SHIFT + PGD_T_LOG2)
+#define PPC44x_PGD_OFF_MASK_BIT (PGDIR_SHIFT - PGD_T_LOG2)
+#define PPC44x_PTE_ADD_SHIFT (32 - PGDIR_SHIFT + PTE_SHIFT + PTE_T_LOG2)
+#define PPC44x_PTE_ADD_MASK_BIT (32 - PTE_T_LOG2 - PTE_SHIFT)
+
+#endif /* _ASM_POWERPC_MMU_44X_H_ */