#ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
#define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
-#define H_PTE_INDEX_SIZE 9
-#define H_PMD_INDEX_SIZE 7
-#define H_PUD_INDEX_SIZE 9
-#define H_PGD_INDEX_SIZE 9
+#define H_PTE_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 4KB = 2MB
+#define H_PMD_INDEX_SIZE 7 // size: 8B << 7 = 1KB, maps: 2^7 x 2MB = 256MB
+#define H_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB
+#define H_PGD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 128GB = 64TB
/*
* Each context is 512TB. But on 4k we restrict our max TASK size to 64TB
#ifndef _ASM_POWERPC_BOOK3S_64_HASH_64K_H
#define _ASM_POWERPC_BOOK3S_64_HASH_64K_H
-#define H_PTE_INDEX_SIZE 8
-#define H_PMD_INDEX_SIZE 10
-#define H_PUD_INDEX_SIZE 10
-#define H_PGD_INDEX_SIZE 8
+#define H_PTE_INDEX_SIZE 8 // size: 8B << 8 = 2KB, maps 2^8 x 64KB = 16MB
+#define H_PMD_INDEX_SIZE 10 // size: 8B << 10 = 8KB, maps 2^10 x 16MB = 16GB
+#define H_PUD_INDEX_SIZE 10 // size: 8B << 10 = 8KB, maps 2^10 x 16GB = 16TB
+#define H_PGD_INDEX_SIZE 8 // size: 8B << 8 = 2KB, maps 2^8 x 16TB = 4PB
+
/*
* Each context is 512TB size. SLB miss for first context/default context
/*
* For 4K page size supported index is 13/9/9/9
*/
-#define RADIX_PTE_INDEX_SIZE 9 /* 2MB huge page */
-#define RADIX_PMD_INDEX_SIZE 9 /* 1G huge page */
-#define RADIX_PUD_INDEX_SIZE 9
-#define RADIX_PGD_INDEX_SIZE 13
+#define RADIX_PTE_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps 2^9 x 4K = 2MB
+#define RADIX_PMD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps 2^9 x 2MB = 1GB
+#define RADIX_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps 2^9 x 1GB = 512GB
+#define RADIX_PGD_INDEX_SIZE 13 // size: 8B << 13 = 64KB, maps 2^13 x 512GB = 4PB
+
/*
* One fragment per per page
*/
/*
* For 64K page size supported index is 13/9/9/5
*/
-#define RADIX_PTE_INDEX_SIZE 5 /* 2MB huge page */
-#define RADIX_PMD_INDEX_SIZE 9 /* 1G huge page */
-#define RADIX_PUD_INDEX_SIZE 9
-#define RADIX_PGD_INDEX_SIZE 13
+#define RADIX_PTE_INDEX_SIZE 5 // size: 8B << 5 = 256B, maps 2^5 x 64K = 2MB
+#define RADIX_PMD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps 2^9 x 2MB = 1GB
+#define RADIX_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps 2^9 x 1GB = 512GB
+#define RADIX_PGD_INDEX_SIZE 13 // size: 8B << 13 = 64KB, maps 2^13 x 512GB = 4PB
/*
* We use a 256 byte PTE page fragment in radix