/* * Software MMU support * * Copyright (c) 2003 Fabrice Bellard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #include "qemu-timer.h" #define DATA_SIZE (1 << SHIFT) #if DATA_SIZE == 8 #define SUFFIX q #define USUFFIX q #define DATA_TYPE uint64_t #elif DATA_SIZE == 4 #define SUFFIX l #define USUFFIX l #define DATA_TYPE uint32_t #elif DATA_SIZE == 2 #define SUFFIX w #define USUFFIX uw #define DATA_TYPE uint16_t #elif DATA_SIZE == 1 #define SUFFIX b #define USUFFIX ub #define DATA_TYPE uint8_t #else #error unsupported data size #endif #ifdef SOFTMMU_CODE_ACCESS #define READ_ACCESS_TYPE 2 #define ADDR_READ addr_code #else #define READ_ACCESS_TYPE 0 #define ADDR_READ addr_read #endif static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(target_ulong addr, int mmu_idx, void *retaddr); static inline DATA_TYPE glue(io_read, SUFFIX)(target_phys_addr_t physaddr, target_ulong addr, void *retaddr) { DATA_TYPE res; int index; index = (physaddr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); physaddr = (physaddr & TARGET_PAGE_MASK) + addr; env->mem_io_pc = (unsigned long)retaddr; if (index > (IO_MEM_NOTDIRTY >> IO_MEM_SHIFT) && !can_do_io(env)) { cpu_io_recompile(env, retaddr); } env->mem_io_vaddr = addr; #if SHIFT <= 2 res = io_mem_read[index][SHIFT](io_mem_opaque[index], physaddr); #else #ifdef TARGET_WORDS_BIGENDIAN res = (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr) << 32; res |= io_mem_read[index][2](io_mem_opaque[index], physaddr + 4); #else res = io_mem_read[index][2](io_mem_opaque[index], physaddr); res |= (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr + 4) << 32; #endif #endif /* SHIFT > 2 */ return res; } /* handle all cases except unaligned access which span two pages */ DATA_TYPE REGPARM glue(glue(__ld, SUFFIX), MMUSUFFIX)(target_ulong addr, int mmu_idx) { DATA_TYPE res; int index; target_ulong tlb_addr; target_phys_addr_t ioaddr; unsigned long addend; void *retaddr; /* test if there is match for unaligned or IO access */ /* XXX: could done more in memory macro in a non portable way */ index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); redo: tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { if (tlb_addr & ~TARGET_PAGE_MASK) { /* IO access */ if ((addr & (DATA_SIZE - 1)) != 0) goto do_unaligned_access; retaddr = GETPC(); ioaddr = env->iotlb[mmu_idx][index]; res = glue(io_read, SUFFIX)(ioaddr, addr, retaddr); } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { /* slow unaligned access (it spans two pages or IO) */ do_unaligned_access: retaddr = GETPC(); #ifdef ALIGNED_ONLY do_unaligned_access(addr, READ_ACCESS_TYPE, mmu_idx, retaddr); #endif res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr, mmu_idx, retaddr); } else { /* unaligned/aligned access in the same page */ #ifdef ALIGNED_ONLY if ((addr & (DATA_SIZE - 1)) != 0) { retaddr = GETPC(); do_unaligned_access(addr, READ_ACCESS_TYPE, mmu_idx, retaddr); } #endif addend = env->tlb_table[mmu_idx][index].addend; res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(long)(addr+addend)); } } else { /* the page is not in the TLB : fill it */ retaddr = GETPC(); #ifdef ALIGNED_ONLY if ((addr & (DATA_SIZE - 1)) != 0) do_unaligned_access(addr, READ_ACCESS_TYPE, mmu_idx, retaddr); #endif tlb_fill(addr, READ_ACCESS_TYPE, mmu_idx, retaddr); goto redo; } return res; } /* handle all unaligned cases */ static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(target_ulong addr, int mmu_idx, void *retaddr) { DATA_TYPE res, res1, res2; int index, shift; target_phys_addr_t ioaddr; unsigned long addend; target_ulong tlb_addr, addr1, addr2; index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); redo: tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { if (tlb_addr & ~TARGET_PAGE_MASK) { /* IO access */ if ((addr & (DATA_SIZE - 1)) != 0) goto do_unaligned_access; ioaddr = env->iotlb[mmu_idx][index]; res = glue(io_read, SUFFIX)(ioaddr, addr, retaddr); } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { do_unaligned_access: /* slow unaligned access (it spans two pages) */ addr1 = addr & ~(DATA_SIZE - 1); addr2 = addr1 + DATA_SIZE; res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1, mmu_idx, retaddr); res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2, mmu_idx, retaddr); shift = (addr & (DATA_SIZE - 1)) * 8; #ifdef TARGET_WORDS_BIGENDIAN res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift)); #else res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift)); #endif res = (DATA_TYPE)res; } else { /* unaligned/aligned access in the same page */ addend = env->tlb_table[mmu_idx][index].addend; res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(long)(addr+addend)); } } else { /* the page is not in the TLB : fill it */ tlb_fill(addr, READ_ACCESS_TYPE, mmu_idx, retaddr); goto redo; } return res; } #ifndef SOFTMMU_CODE_ACCESS static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(target_ulong addr, DATA_TYPE val, int mmu_idx, void *retaddr); static inline void glue(io_write, SUFFIX)(target_phys_addr_t physaddr, DATA_TYPE val, target_ulong addr, void *retaddr) { int index; index = (physaddr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); physaddr = (physaddr & TARGET_PAGE_MASK) + addr; if (index > (IO_MEM_NOTDIRTY >> IO_MEM_SHIFT) && !can_do_io(env)) { cpu_io_recompile(env, retaddr); } env->mem_io_vaddr = addr; env->mem_io_pc = (unsigned long)retaddr; #if SHIFT <= 2 io_mem_write[index][SHIFT](io_mem_opaque[index], physaddr, val); #else #ifdef TARGET_WORDS_BIGENDIAN io_mem_write[index][2](io_mem_opaque[index], physaddr, val >> 32); io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val); #else io_mem_write[index][2](io_mem_opaque[index], physaddr, val); io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val >> 32); #endif #endif /* SHIFT > 2 */ } void REGPARM glue(glue(__st, SUFFIX), MMUSUFFIX)(target_ulong addr, DATA_TYPE val, int mmu_idx) { target_phys_addr_t ioaddr; unsigned long addend; target_ulong tlb_addr; void *retaddr; int index; index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); redo: tlb_addr = env->tlb_table[mmu_idx][index].addr_write; if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { if (tlb_addr & ~TARGET_PAGE_MASK) { /* IO access */ if ((addr & (DATA_SIZE - 1)) != 0) goto do_unaligned_access; retaddr = GETPC(); ioaddr = env->iotlb[mmu_idx][index]; glue(io_write, SUFFIX)(ioaddr, val, addr, retaddr); } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { do_unaligned_access: retaddr = GETPC(); #ifdef ALIGNED_ONLY do_unaligned_access(addr, 1, mmu_idx, retaddr); #endif glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val, mmu_idx, retaddr); } else { /* aligned/unaligned access in the same page */ #ifdef ALIGNED_ONLY if ((addr & (DATA_SIZE - 1)) != 0) { retaddr = GETPC(); do_unaligned_access(addr, 1, mmu_idx, retaddr); } #endif addend = env->tlb_table[mmu_idx][index].addend; glue(glue(st, SUFFIX), _raw)((uint8_t *)(long)(addr+addend), val); } } else { /* the page is not in the TLB : fill it */ retaddr = GETPC(); #ifdef ALIGNED_ONLY if ((addr & (DATA_SIZE - 1)) != 0) do_unaligned_access(addr, 1, mmu_idx, retaddr); #endif tlb_fill(addr, 1, mmu_idx, retaddr); goto redo; } } /* handles all unaligned cases */ static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(target_ulong addr, DATA_TYPE val, int mmu_idx, void *retaddr) { target_phys_addr_t ioaddr; unsigned long addend; target_ulong tlb_addr; int index, i; index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); redo: tlb_addr = env->tlb_table[mmu_idx][index].addr_write; if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { if (tlb_addr & ~TARGET_PAGE_MASK) { /* IO access */ if ((addr & (DATA_SIZE - 1)) != 0) goto do_unaligned_access; ioaddr = env->iotlb[mmu_idx][index]; glue(io_write, SUFFIX)(ioaddr, val, addr, retaddr); } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { do_unaligned_access: /* XXX: not efficient, but simple */ /* Note: relies on the fact that tlb_fill() does not remove the * previous page from the TLB cache. */ for(i = DATA_SIZE - 1; i >= 0; i--) { #ifdef TARGET_WORDS_BIGENDIAN glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), mmu_idx, retaddr); #else glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8), mmu_idx, retaddr); #endif } } else { /* aligned/unaligned access in the same page */ addend = env->tlb_table[mmu_idx][index].addend; glue(glue(st, SUFFIX), _raw)((uint8_t *)(long)(addr+addend), val); } } else { /* the page is not in the TLB : fill it */ tlb_fill(addr, 1, mmu_idx, retaddr); goto redo; } } #endif /* !defined(SOFTMMU_CODE_ACCESS) */ #undef READ_ACCESS_TYPE #undef SHIFT #undef DATA_TYPE #undef SUFFIX #undef USUFFIX #undef DATA_SIZE #undef ADDR_READ