151 lines
4.9 KiB
C++
151 lines
4.9 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file PowerPC Memory Management Unit definitions. */
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#ifndef PPCMMU_H
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#define PPCMMU_H
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#include <devices/memctrl/memctrlbase.h>
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#include <cinttypes>
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#include <functional>
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class MMIODevice;
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/* Uncomment this to exhaustive MMU integrity checks. */
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//#define MMU_INTEGRITY_CHECKS
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/** generic PowerPC BAT descriptor (MMU internal state) */
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typedef struct PPC_BAT_entry {
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bool valid; /* BAT entry valid for MPC601 */
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uint8_t access; /* copy of Vs | Vp bits */
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uint8_t prot; /* copy of PP bits */
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uint32_t phys_hi; /* high-order bits for physical address generation */
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uint32_t hi_mask; /* mask for high-order logical address bits */
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uint32_t bepi; /* copy of Block effective page index */
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} PPC_BAT_entry;
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/** Block address translation types. */
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enum BATType : int {
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IBAT,
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DBAT
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};
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/** TLB types. */
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enum TLBType : int {
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ITLB,
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DTLB
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};
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/** Result of the block address translation. */
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typedef struct BATResult {
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bool hit;
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uint8_t prot;
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uint32_t phys;
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} BATResult;
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/** Result of the page address translation. */
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typedef struct PATResult {
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uint32_t phys;
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uint8_t prot;
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uint8_t pte_c_status; // status of the C bit of the PTE
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} PATResult;
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/** DMA memory mapping result. */
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typedef struct MapDmaResult {
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uint32_t type;
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bool is_writable;
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// for memory regions
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uint8_t* host_va;
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// for MMIO regions
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MMIODevice* dev_obj;
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uint32_t dev_base;
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} MapDmaResult;
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constexpr uint32_t PPC_PAGE_SIZE_BITS = 12;
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constexpr uint32_t PPC_PAGE_SIZE = (1 << PPC_PAGE_SIZE_BITS);
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constexpr uint32_t PPC_PAGE_MASK = ~(PPC_PAGE_SIZE - 1);
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constexpr uint32_t TLB_SIZE = 4096;
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constexpr uint32_t TLB2_WAYS = 4;
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constexpr uint32_t TLB_INVALID_TAG = 0xFFFFFFFF;
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typedef struct TLBEntry {
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uint32_t tag;
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uint16_t flags;
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uint16_t lru_bits;
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union {
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struct { // for memory pages
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int64_t host_va_offs_r;
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int64_t host_va_offs_w;
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};
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struct { // for MMIO pages
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AddressMapEntry* rgn_desc;
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int64_t dev_base_va;
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};
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};
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uint32_t phys_tag;
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uint32_t reserved;
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} TLBEntry;
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enum TLBFlags : uint16_t {
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PAGE_MEM = 1 << 0, // memory page backed by host memory
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PAGE_IO = 1 << 1, // memory mapped I/O page
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PAGE_NOPHYS = 1 << 2, // no physical storage for this page (unmapped)
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TLBE_FROM_BAT = 1 << 3, // TLB entry has been translated with BAT
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TLBE_FROM_PAT = 1 << 4, // TLB entry has been translated with PAT
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PAGE_WRITABLE = 1 << 5, // page is writable
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PTE_SET_C = 1 << 6, // tells if C bit of the PTE needs to be updated
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};
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extern std::function<void(uint32_t bat_reg)> ibat_update;
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extern std::function<void(uint32_t bat_reg)> dbat_update;
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extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmio);
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extern void mmu_change_mode(void);
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extern void mmu_pat_ctx_changed();
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extern void tlb_flush_entry(uint32_t ea);
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extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
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uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr = nullptr);
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bool mmu_translate_dbg(uint32_t guest_va, uint32_t &guest_pa);
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template <class T>
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extern T mmu_read_vmem(uint32_t guest_va);
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template <class T>
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extern void mmu_write_vmem(uint32_t guest_va, T value);
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//====================== Deprecated calls =========================
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#if 0
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extern void mem_write_byte(uint32_t addr, uint8_t value);
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extern void mem_write_word(uint32_t addr, uint16_t value);
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extern void mem_write_dword(uint32_t addr, uint32_t value);
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extern void mem_write_qword(uint32_t addr, uint64_t value);
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extern uint8_t mem_grab_byte(uint32_t addr);
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extern uint16_t mem_grab_word(uint32_t addr);
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extern uint32_t mem_grab_dword(uint32_t addr);
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extern uint64_t mem_grab_qword(uint32_t addr);
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extern uint8_t* quickinstruction_translate(uint32_t address_grab);
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#endif
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#endif // PPCMMU_H
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