/* ** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved. ** Distributed under the terms of the OpenBeOS License. */ #ifndef _KERNEL_ARCH_M68K_040_MMU_H #define _KERNEL_ARCH_M68K_040_MMU_H #include #include #include // global pages only available on 040/060 // check this #define MMU_HAS_GLOBAL_PAGES enum _mmu040_cache_mode { CM_CACHABLE_WRITETHROUGH, CM_CACHABLE_COPYBACK, CM_DISABLED_SERIALIZED, CM_DISABLED, }; /* This is the normal layout of the descriptors, as per documentation. * When page size > 256, several bits are unused in the LSB of page * addresses, which we can use in addition of other unused bits. * the structs dedlared later reflect this for 4K pages. */ // = names in MC user's manual // or comments struct short_page_directory_entry { // upper 32 bits uint32 addr : 28; // address uint32 accessed : 1; // = used uint32 write_protect : 1; uint32 type : 2; // DT_* }; struct short_page_table_entry { uint32 addr : 20; // address uint32 user_reserved : 1; uint32 global : 1; uint32 upa0 : 1; // User Page Attribute 0 uint32 upa1 : 1; // User Page Attribute 1 uint32 supervisor : 1; uint32 cache_mode : 2; uint32 dirty : 1; // = modified uint32 accessed : 1; // = used uint32 write_protect : 1; uint32 type : 2; }; /* rarely used */ struct short_indirect_entry { // upper 32 bits uint32 addr : 30; // address uint32 type : 2; // DT_* }; /* for clarity: - the top level page directory will be called "page root", (root or rtdir) - the 2nd level will be "page directory" like on x86, (pgdir) - the 3rd level is a "page table" as on x86. (pgtbl) */ /* struct types suffixed with _s */ typedef struct short_page_directory_entry page_root_entry_s; typedef struct short_page_directory_entry page_directory_entry_s; typedef struct short_page_table_entry page_table_entry_s; typedef struct short_indirect_entry page_indirect_entry_s; /* scalar storage type that maps them */ typedef uint32 page_root_entry; typedef uint32 page_directory_entry; typedef uint32 page_table_entry; typedef uint32 page_indirect_entry; #define DT_ROOT DT_VALID_4 #define DT_DIR DT_VALID_4 //#define DT_PAGE DT_PAGE :) #define DT_INDIRECT DT_VALID_4 /* bitmask access */ /* those are valid for all entries */ #define M68K_PE_READONLY 0x00000004 #define M68K_PE_ACCESSED 0x00000008 #define M68K_PRE_READONLY T M68K_PE_READONLY #define M68K_PRE_ACCESSED M68K_PE_ACCESSED #define M68K_PRE_ADDRESS_MASK 0xfffffff0 #define M68K_PDE_READONLY M68K_PE_READONLY #define M68K_PDE_ACCESSED M68K_PE_ACCESSED #define M68K_PDE_ADDRESS_MASK 0xfffffff0 #define M68K_PTE_READONLY M68K_PE_READONLY #define M68K_PTE_ACCESSED M68K_PE_ACCESSED #define M68K_PTE_DIRTY 0x00000010 #define M68K_PTE_CACHE_MODE_MASK 0x00000060 #define M68K_PTE_CACHE_MODE_SHIFT 5 #define M68K_PTE_SUPERVISOR 0x00000080 #define M68K_PTE_UPA1 0x00000100 #define M68K_PTE_UPA0 0x00000200 #define M68K_PTE_GLOBAL 0x00000400 #define M68K_PTE_USER_RESERVED 0x00000800 #define M68K_PTE_ADDRESS_MASK 0xfffff000 #define M68K_PIE_ADDRESS_MASK 0xfffffffc /* default scalar values for entries */ #define DFL_ROOTENT_VAL 0x00000000 #define DFL_DIRENT_VAL 0x00000000 #define DFL_PAGEENT_VAL 0x00000000 #define NUM_ROOTENT_PER_TBL 128 #define NUM_DIRENT_PER_TBL 128 #define NUM_PAGEENT_PER_TBL 64 /* unlike x86, the root/dir/page table sizes are different than B_PAGE_SIZE * so we will have to fit more than one on a page to avoid wasting space. * We will allocate a group of tables with the one we want inside, and * add them from the aligned index needed, to make it easy to free them. */ #define SIZ_ROOTTBL (NUM_ROOTENT_PER_TBL * sizeof(page_root_entry)) #define SIZ_DIRTBL (NUM_DIRENT_PER_TBL * sizeof(page_directory_entry)) #define SIZ_PAGETBL (NUM_PAGEENT_PER_TBL * sizeof(page_table_entry)) //#define NUM_ROOTTBL_PER_PAGE (B_PAGE_SIZE / SIZ_ROOTTBL) #define NUM_DIRTBL_PER_PAGE (B_PAGE_SIZE / SIZ_DIRTBL) #define NUM_PAGETBL_PER_PAGE (B_PAGE_SIZE / SIZ_PAGETBL) /* macros to get the physical page or table number and address of tables from * descriptors */ // TA: table address // PN: page number // PA: page address // PO: page offset (offset of table in page) // PI: page index (index of table relative to page start) // from a root entry #define PRE_TYPE(e) ((e) & M68K_PE_DT_MASK) #define PRE_TO_TA(e) (((uint32)(e)) & ~((1<<9)-1)) #define PRE_TO_PN(e) (((uint32)(e)) >> 12) #define PRE_TO_PA(e) (((uint32)(e)) & ~((1<<12)-1)) //#define PRE_TO_PO(e) (((uint32)(e)) & ((1<<12)-1)) //#define PRE_TO_PI(e) ((((uint32)(e)) & ((1<<12)-1)) / SIZ_DIRTBL) #define TA_TO_PREA(a) ((a) & M68K_PRE_ADDRESS_MASK) // from a directory entry #define PDE_TYPE(e) ((e) & M68K_PE_DT_MASK) #define PDE_TO_TA(e) (((uint32)(e)) & ~((1<<8)-1)) #define PDE_TO_PN(e) (((uint32)(e)) >> 12) #define PDE_TO_PA(e) (((uint32)(e)) & ~((1<<12)-1)) //#define PDE_TO_PO(e) (((uint32)(e)) & ((1<<12)-1)) //#define PDE_TO_PI(e) ((((uint32)(e)) & ((1<<12)-1)) / SIZ_PAGETBL) #define TA_TO_PDEA(a) ((a) & M68K_PDE_ADDRESS_MASK) // from a table entry #define PTE_TYPE(e) ((e) & M68K_PE_DT_MASK) #define PTE_TO_TA(e) (((uint32)(e)) & ~((1<<12)-1)) #define PTE_TO_PN(e) (((uint32)(e)) >> 12) #define PTE_TO_PA(e) (((uint32)(e)) & ~((1<<12)-1)) #define TA_TO_PTEA(a) ((a) & M68K_PTE_ADDRESS_MASK) // from an indirect entry #define PIE_TYPE(e) ((e) & M68K_PE_DT_MASK) #define PIE_TO_TA(e) (((uint32)(e)) & ~((1<<2)-1)) #define PIE_TO_PN(e) (((uint32)(e)) >> 12) #define PIE_TO_PA(e) (((uint32)(e)) & ~((1<<12)-1)) #define PIE_TO_PO(e) (((uint32)(e)) & ((1<<12)-(1<<2))) #define TA_TO_PIEA(a) ((a) & M68K_PIE_ADDRESS_MASK) /* 7/7/6 split */ #define VADDR_TO_PRENT(va) (((va) / B_PAGE_SIZE) / (64*128)) #define VADDR_TO_PDENT(va) ((((va) / B_PAGE_SIZE) / 64) % 128) #define VADDR_TO_PTENT(va) (((va) / B_PAGE_SIZE) % 64) #endif /* _KERNEL_ARCH_M68K_040_MMU_H */