| /* |
| * 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #define DATA_SIZE (1 << SHIFT) |
| |
| #if DATA_SIZE == 8 |
| #define SUFFIX q |
| #define DATA_TYPE uint64_t |
| #elif DATA_SIZE == 4 |
| #define SUFFIX l |
| #define DATA_TYPE uint32_t |
| #elif DATA_SIZE == 2 |
| #define SUFFIX w |
| #define DATA_TYPE uint16_t |
| #elif DATA_SIZE == 1 |
| #define SUFFIX b |
| #define DATA_TYPE uint8_t |
| #else |
| #error unsupported data size |
| #endif |
| |
| static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr); |
| static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val, |
| void *retaddr); |
| |
| static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr, |
| unsigned long tlb_addr) |
| { |
| DATA_TYPE res; |
| int index; |
| |
| index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); |
| #if SHIFT <= 2 |
| res = io_mem_read[index][SHIFT](physaddr); |
| #else |
| #ifdef TARGET_WORDS_BIGENDIAN |
| res = (uint64_t)io_mem_read[index][2](physaddr) << 32; |
| res |= io_mem_read[index][2](physaddr + 4); |
| #else |
| res = io_mem_read[index][2](physaddr); |
| res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32; |
| #endif |
| #endif /* SHIFT > 2 */ |
| return res; |
| } |
| |
| static inline void glue(io_write, SUFFIX)(unsigned long physaddr, |
| DATA_TYPE val, |
| unsigned long tlb_addr) |
| { |
| int index; |
| |
| index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); |
| #if SHIFT <= 2 |
| io_mem_write[index][SHIFT](physaddr, val); |
| #else |
| #ifdef TARGET_WORDS_BIGENDIAN |
| io_mem_write[index][2](physaddr, val >> 32); |
| io_mem_write[index][2](physaddr + 4, val); |
| #else |
| io_mem_write[index][2](physaddr, val); |
| io_mem_write[index][2](physaddr + 4, val >> 32); |
| #endif |
| #endif /* SHIFT > 2 */ |
| } |
| |
| /* handle all cases except unaligned access which span two pages */ |
| DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr) |
| { |
| DATA_TYPE res; |
| int is_user, index; |
| unsigned long physaddr, tlb_addr; |
| void *retaddr; |
| |
| /* test if there is match for unaligned or IO access */ |
| /* XXX: could done more in memory macro in a non portable way */ |
| is_user = (env->cpl == 3); |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_read[is_user][index].address; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| physaddr = addr + env->tlb_read[is_user][index].addend; |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| res = glue(io_read, SUFFIX)(physaddr, tlb_addr); |
| } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| /* slow unaligned access (it spans two pages or IO) */ |
| do_unaligned_access: |
| retaddr = __builtin_return_address(0); |
| res = glue(slow_ld, SUFFIX)(addr, retaddr); |
| } else { |
| /* unaligned access in the same page */ |
| res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| retaddr = __builtin_return_address(0); |
| tlb_fill(addr, 0, retaddr); |
| goto redo; |
| } |
| return res; |
| } |
| |
| /* handle all unaligned cases */ |
| static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr) |
| { |
| DATA_TYPE res, res1, res2; |
| int is_user, index, shift; |
| unsigned long physaddr, tlb_addr, addr1, addr2; |
| |
| is_user = (env->cpl == 3); |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_read[is_user][index].address; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| physaddr = addr + env->tlb_read[is_user][index].addend; |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| res = glue(io_read, SUFFIX)(physaddr, tlb_addr); |
| } else if (((addr & 0xfff) + 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(slow_ld, SUFFIX)(addr1, retaddr); |
| res2 = glue(slow_ld, SUFFIX)(addr2, 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 |
| } else { |
| /* unaligned/aligned access in the same page */ |
| res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| tlb_fill(addr, 0, retaddr); |
| goto redo; |
| } |
| return res; |
| } |
| |
| |
| void REGPARM(2) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE val) |
| { |
| unsigned long physaddr, tlb_addr; |
| void *retaddr; |
| int is_user, index; |
| |
| is_user = (env->cpl == 3); |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_write[is_user][index].address; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| physaddr = addr + env->tlb_read[is_user][index].addend; |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| glue(io_write, SUFFIX)(physaddr, val, tlb_addr); |
| } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| do_unaligned_access: |
| retaddr = __builtin_return_address(0); |
| glue(slow_st, SUFFIX)(addr, val, retaddr); |
| } else { |
| /* aligned/unaligned access in the same page */ |
| glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| retaddr = __builtin_return_address(0); |
| tlb_fill(addr, 1, retaddr); |
| goto redo; |
| } |
| } |
| |
| /* handles all unaligned cases */ |
| static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val, |
| void *retaddr) |
| { |
| unsigned long physaddr, tlb_addr; |
| int is_user, index, i; |
| |
| is_user = (env->cpl == 3); |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_write[is_user][index].address; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| physaddr = addr + env->tlb_read[is_user][index].addend; |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| glue(io_write, SUFFIX)(physaddr, val, tlb_addr); |
| } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| do_unaligned_access: |
| /* XXX: not efficient, but simple */ |
| for(i = 0;i < DATA_SIZE; i++) { |
| #ifdef TARGET_WORDS_BIGENDIAN |
| slow_stb(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), retaddr); |
| #else |
| slow_stb(addr + i, val >> (i * 8), retaddr); |
| #endif |
| } |
| } else { |
| /* aligned/unaligned access in the same page */ |
| glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| tlb_fill(addr, 1, retaddr); |
| goto redo; |
| } |
| } |
| |
| #undef SHIFT |
| #undef DATA_TYPE |
| #undef SUFFIX |
| #undef DATA_SIZE |
