book3s/64/radix-64k.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_POWERPC_PGTABLE_RADIX_64K_H
0003 #define _ASM_POWERPC_PGTABLE_RADIX_64K_H
0004
0005 /*
0006  * For 64K page size supported index is 13/9/9/5
0007  */
0008 #define RADIX_PTE_INDEX_SIZE   5  // size: 8B <<  5 = 256B, maps 2^5  x   64K =   2MB
0009 #define RADIX_PMD_INDEX_SIZE   9  // size: 8B <<  9 =  4KB, maps 2^9  x   2MB =   1GB
0010 #define RADIX_PUD_INDEX_SIZE   9  // size: 8B <<  9 =  4KB, maps 2^9  x   1GB = 512GB
0011 #define RADIX_PGD_INDEX_SIZE  13  // size: 8B << 13 = 64KB, maps 2^13 x 512GB =   4PB
0012
0013 /*
0014  * We use a 256 byte PTE page fragment in radix
0015  * 8 bytes per each PTE entry.
0016  */
0017 #define RADIX_PTE_FRAG_SIZE_SHIFT  (RADIX_PTE_INDEX_SIZE + 3)
0018 #define RADIX_PTE_FRAG_NR   (PAGE_SIZE >> RADIX_PTE_FRAG_SIZE_SHIFT)
0019
0020 #define RADIX_PMD_FRAG_SIZE_SHIFT  (RADIX_PMD_INDEX_SIZE + 3)
0021 #define RADIX_PMD_FRAG_NR   (PAGE_SIZE >> RADIX_PMD_FRAG_SIZE_SHIFT)
0022
0023 #endif /* _ASM_POWERPC_PGTABLE_RADIX_64K_H */