150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
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/*
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** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
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** Distributed under the terms of the OpenBeOS License.
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*/
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#ifndef _KERNEL_ARCH_M68K_MMU_H
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#define _KERNEL_ARCH_M68K_MMU_H
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#include <SupportDefs.h>
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#include <string.h>
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#include <arch_cpu.h>
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/*** BAT - block address translation ***/
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enum bat_length {
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BAT_LENGTH_128kB = 0x0000,
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BAT_LENGTH_256kB = 0x0001,
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BAT_LENGTH_512kB = 0x0003,
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BAT_LENGTH_1MB = 0x0007,
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BAT_LENGTH_2MB = 0x000f,
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BAT_LENGTH_4MB = 0x001f,
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BAT_LENGTH_8MB = 0x003f,
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BAT_LENGTH_16MB = 0x007f,
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BAT_LENGTH_32MB = 0x00ff,
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BAT_LENGTH_64MB = 0x01ff,
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BAT_LENGTH_128MB = 0x03ff,
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BAT_LENGTH_256MB = 0x07ff,
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};
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enum bat_protection {
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BAT_READ_ONLY = 1,
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BAT_READ_WRITE = 2,
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};
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struct block_address_translation {
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// upper 32 bit
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uint32 page_index : 15; // BEPI, block effective page index
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uint32 _reserved0 : 4;
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uint32 length : 11;
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uint32 kernel_valid : 1; // Vs, Supervisor-state valid
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uint32 user_valid : 1; // Vp, User-state valid
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// lower 32 bit
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uint32 physical_block_number : 15; // BPRN
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uint32 write_through : 1; // WIMG
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uint32 caching_inhibited : 1;
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uint32 memory_coherent : 1;
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uint32 guarded : 1;
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uint32 _reserved1 : 1;
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uint32 protection : 2;
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block_address_translation()
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{
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Clear();
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}
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void SetVirtualAddress(void *address)
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{
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page_index = uint32(address) >> 17;
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}
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void SetPhysicalAddress(void *address)
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{
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physical_block_number = uint32(address) >> 17;
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}
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void Clear()
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{
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memset((void *)this, 0, sizeof(block_address_translation));
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}
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};
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struct segment_descriptor {
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uint32 type : 1; // 0 for page translation descriptors
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uint32 kernel_protection_key : 1; // Ks, Supervisor-state protection key
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uint32 user_protection_key : 1; // Kp, User-state protection key
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uint32 no_execute_protection : 1;
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uint32 _reserved : 4;
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uint32 virtual_segment_id : 24;
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segment_descriptor()
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{
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Clear();
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}
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segment_descriptor(uint32 value)
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{
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*((uint32 *)this) = value;
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}
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void Clear()
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{
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memset((void *)this, 0, sizeof(segment_descriptor));
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}
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};
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/*** PTE - page table entry ***/
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enum pte_protection {
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PTE_READ_ONLY = 3,
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PTE_READ_WRITE = 2,
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};
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struct page_table_entry {
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// upper 32 bit
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uint32 valid : 1;
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uint32 virtual_segment_id : 24;
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uint32 secondary_hash : 1;
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uint32 abbr_page_index : 6;
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// lower 32 bit
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uint32 physical_page_number : 20;
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uint32 _reserved0 : 3;
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uint32 referenced : 1;
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uint32 changed : 1;
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uint32 write_through : 1; // WIMG
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uint32 caching_inhibited : 1;
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uint32 memory_coherent : 1;
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uint32 guarded : 1;
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uint32 _reserved1 : 1;
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uint32 page_protection : 2;
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static uint32 PrimaryHash(uint32 virtualSegmentID, uint32 virtualAddress);
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static uint32 SecondaryHash(uint32 virtualSegmentID, uint32 virtualAddress);
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static uint32 SecondaryHash(uint32 primaryHash);
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};
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struct page_table_entry_group {
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struct page_table_entry entry[8];
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};
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extern void m68k_get_page_table(page_table_entry_group **_pageTable, size_t *_size);
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extern void m68k_set_page_table(page_table_entry_group *pageTable, size_t size);
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static inline segment_descriptor
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m68k_get_segment_register(void *virtualAddress)
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{
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return (segment_descriptor)get_sr(virtualAddress);
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}
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static inline void
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m68k_set_segment_register(void *virtualAddress, segment_descriptor segment)
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{
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set_sr(virtualAddress, *(uint32 *)&segment);
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}
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#endif /* _KERNEL_ARCH_M68K_MMU_H */
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