1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_PAGE_32_H 3 #define _ASM_POWERPC_PAGE_32_H 4 5 #include <asm/cache.h> 6 7 #if defined(CONFIG_PHYSICAL_ALIGN) && (CONFIG_PHYSICAL_START != 0) 8 #if (CONFIG_PHYSICAL_START % CONFIG_PHYSICAL_ALIGN) != 0 9 #error "CONFIG_PHYSICAL_START must be a multiple of CONFIG_PHYSICAL_ALIGN" 10 #endif 11 #endif 12 13 #define VM_DATA_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS32 14 15 #if defined(CONFIG_PPC_256K_PAGES) || \ 16 (defined(CONFIG_PPC_8xx) && defined(CONFIG_PPC_16K_PAGES)) 17 #define PTE_SHIFT (PAGE_SHIFT - PTE_T_LOG2 - 2) /* 1/4 of a page */ 18 #else 19 #define PTE_SHIFT (PAGE_SHIFT - PTE_T_LOG2) /* full page */ 20 #endif 21 22 #ifndef __ASSEMBLY__ 23 /* 24 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit 25 * physical addressing. 26 */ 27 #ifdef CONFIG_PTE_64BIT 28 typedef unsigned long long pte_basic_t; 29 #else 30 typedef unsigned long pte_basic_t; 31 #endif 32 33 #include <asm/bug.h> 34 35 /* 36 * Clear page using the dcbz instruction, which doesn't cause any 37 * memory traffic (except to write out any cache lines which get 38 * displaced). This only works on cacheable memory. 39 */ 40 static inline void clear_page(void *addr) 41 { 42 unsigned int i; 43 44 WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); 45 46 for (i = 0; i < PAGE_SIZE / L1_CACHE_BYTES; i++, addr += L1_CACHE_BYTES) 47 dcbz(addr); 48 } 49 extern void copy_page(void *to, void *from); 50 51 #include <asm-generic/getorder.h> 52 53 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 54 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 55 56 #endif /* __ASSEMBLY__ */ 57 58 #endif /* _ASM_POWERPC_PAGE_32_H */ 59