Software MMU support (used for memory mapped devices such as VGA)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@347 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
17b0018b42
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b92e5a22ec
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/*
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* Software MMU support
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#if DATA_SIZE == 8
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#define SUFFIX q
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#define DATA_TYPE uint64_t
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#elif DATA_SIZE == 4
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#define SUFFIX l
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#define DATA_TYPE uint32_t
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#elif DATA_SIZE == 2
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#define SUFFIX w
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#define DATA_TYPE uint16_t
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#define DATA_STYPE int16_t
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#elif DATA_SIZE == 1
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#define SUFFIX b
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#define DATA_TYPE uint8_t
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#define DATA_STYPE int8_t
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#else
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#error unsupported data size
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#endif
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#if MEMUSER == 0
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#define MEMSUFFIX _kernel
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#else
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#define MEMSUFFIX _user
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#endif
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#if DATA_SIZE == 8
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#define RES_TYPE uint64_t
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#else
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#define RES_TYPE int
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#endif
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#if MEMUSER == 0
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DATA_TYPE __attribute((regparm(1))) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr);
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void __attribute((regparm(2))) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE v);
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#endif
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static inline int glue(glue(ldu, SUFFIX), MEMSUFFIX)(void *ptr)
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{
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int index;
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RES_TYPE res;
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unsigned long addr, physaddr;
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addr = (unsigned long)ptr;
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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if (__builtin_expect(env->tlb_read[MEMUSER][index].address !=
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(addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
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res = glue(glue(__ld, SUFFIX), _mmu)(addr);
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} else {
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physaddr = addr + env->tlb_read[MEMUSER][index].addend;
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res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
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}
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return res;
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}
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#if DATA_SIZE <= 2
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static inline int glue(glue(lds, SUFFIX), MEMSUFFIX)(void *ptr)
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{
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int res, index;
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unsigned long addr, physaddr;
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addr = (unsigned long)ptr;
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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if (__builtin_expect(env->tlb_read[MEMUSER][index].address !=
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(addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
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res = (DATA_STYPE)glue(glue(__ld, SUFFIX), _mmu)(addr);
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} else {
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physaddr = addr + env->tlb_read[MEMUSER][index].addend;
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res = glue(glue(lds, SUFFIX), _raw)((uint8_t *)physaddr);
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}
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return res;
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}
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#endif
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static inline void glue(glue(st, SUFFIX), MEMSUFFIX)(void *ptr, RES_TYPE v)
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{
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int index;
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unsigned long addr, physaddr;
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addr = (unsigned long)ptr;
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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if (__builtin_expect(env->tlb_write[MEMUSER][index].address !=
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(addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
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glue(glue(__st, SUFFIX), _mmu)(addr, v);
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} else {
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physaddr = addr + env->tlb_write[MEMUSER][index].addend;
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glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, v);
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}
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}
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#undef RES_TYPE
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#undef DATA_TYPE
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#undef DATA_STYPE
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#undef SUFFIX
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#undef DATA_SIZE
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#undef MEMSUFFIX
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@ -0,0 +1,241 @@
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/*
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* Software MMU support
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define DATA_SIZE (1 << SHIFT)
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#if DATA_SIZE == 8
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#define SUFFIX q
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#define DATA_TYPE uint64_t
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#elif DATA_SIZE == 4
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#define SUFFIX l
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#define DATA_TYPE uint32_t
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#elif DATA_SIZE == 2
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#define SUFFIX w
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#define DATA_TYPE uint16_t
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#elif DATA_SIZE == 1
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#define SUFFIX b
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#define DATA_TYPE uint8_t
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#else
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#error unsupported data size
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#endif
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static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr);
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static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val,
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void *retaddr);
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static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr,
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unsigned long tlb_addr)
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{
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DATA_TYPE res;
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int index;
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index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
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#if SHIFT <= 2
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res = io_mem_read[index][SHIFT](physaddr);
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#else
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#ifdef TARGET_WORDS_BIGENDIAN
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res = (uint64_t)io_mem_read[index][2](physaddr) << 32;
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res |= io_mem_read[index][2](physaddr + 4);
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#else
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res = io_mem_read[index][2](physaddr);
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res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32;
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#endif
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#endif /* SHIFT > 2 */
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return res;
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}
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static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
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DATA_TYPE val,
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unsigned long tlb_addr)
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{
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int index;
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index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
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#if SHIFT <= 2
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io_mem_write[index][SHIFT](physaddr, val);
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#else
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#ifdef TARGET_WORDS_BIGENDIAN
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io_mem_write[index][2](physaddr, val >> 32);
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io_mem_write[index][2](physaddr + 4, val);
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#else
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io_mem_write[index][2](physaddr, val);
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io_mem_write[index][2](physaddr + 4, val >> 32);
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#endif
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#endif /* SHIFT > 2 */
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}
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/* handle all cases except unaligned access which span two pages */
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DATA_TYPE __attribute((regparm(1))) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr)
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{
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DATA_TYPE res;
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int is_user, index;
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unsigned long physaddr, tlb_addr;
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void *retaddr;
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/* test if there is match for unaligned or IO access */
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/* XXX: could done more in memory macro in a non portable way */
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is_user = (env->cpl == 3);
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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redo:
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tlb_addr = env->tlb_read[is_user][index].address;
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if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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physaddr = addr + env->tlb_read[is_user][index].addend;
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if (tlb_addr & ~TARGET_PAGE_MASK) {
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/* IO access */
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if ((addr & (DATA_SIZE - 1)) != 0)
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goto do_unaligned_access;
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res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
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} else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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/* slow unaligned access (it spans two pages or IO) */
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do_unaligned_access:
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retaddr = __builtin_return_address(0);
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res = glue(slow_ld, SUFFIX)(addr, retaddr);
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} else {
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/* unaligned access in the same page */
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res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
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}
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} else {
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/* the page is not in the TLB : fill it */
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retaddr = __builtin_return_address(0);
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tlb_fill(addr, 0, retaddr);
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goto redo;
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}
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return res;
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}
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/* handle all unaligned cases */
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static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr)
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{
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DATA_TYPE res, res1, res2;
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int is_user, index, shift;
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unsigned long physaddr, tlb_addr, addr1, addr2;
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is_user = (env->cpl == 3);
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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redo:
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tlb_addr = env->tlb_read[is_user][index].address;
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if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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physaddr = addr + env->tlb_read[is_user][index].addend;
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if (tlb_addr & ~TARGET_PAGE_MASK) {
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/* IO access */
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if ((addr & (DATA_SIZE - 1)) != 0)
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goto do_unaligned_access;
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res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
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} else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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do_unaligned_access:
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/* slow unaligned access (it spans two pages) */
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addr1 = addr & ~(DATA_SIZE - 1);
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addr2 = addr1 + DATA_SIZE;
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res1 = glue(slow_ld, SUFFIX)(addr1, retaddr);
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res2 = glue(slow_ld, SUFFIX)(addr2, retaddr);
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shift = (addr & (DATA_SIZE - 1)) * 8;
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#ifdef TARGET_WORDS_BIGENDIAN
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res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
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#else
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res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
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#endif
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} else {
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/* unaligned/aligned access in the same page */
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res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
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}
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} else {
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/* the page is not in the TLB : fill it */
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tlb_fill(addr, 0, retaddr);
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goto redo;
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}
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return res;
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}
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void __attribute((regparm(2))) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE val)
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{
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unsigned long physaddr, tlb_addr;
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void *retaddr;
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int is_user, index;
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is_user = (env->cpl == 3);
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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redo:
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tlb_addr = env->tlb_write[is_user][index].address;
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if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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physaddr = addr + env->tlb_read[is_user][index].addend;
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if (tlb_addr & ~TARGET_PAGE_MASK) {
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/* IO access */
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if ((addr & (DATA_SIZE - 1)) != 0)
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goto do_unaligned_access;
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glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
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} else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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do_unaligned_access:
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retaddr = __builtin_return_address(0);
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glue(slow_st, SUFFIX)(addr, val, retaddr);
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} else {
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/* aligned/unaligned access in the same page */
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glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
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}
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} else {
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/* the page is not in the TLB : fill it */
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retaddr = __builtin_return_address(0);
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tlb_fill(addr, 1, retaddr);
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goto redo;
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}
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}
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/* handles all unaligned cases */
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static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val,
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void *retaddr)
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{
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unsigned long physaddr, tlb_addr;
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int is_user, index, i;
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is_user = (env->cpl == 3);
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index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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redo:
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tlb_addr = env->tlb_write[is_user][index].address;
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if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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physaddr = addr + env->tlb_read[is_user][index].addend;
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if (tlb_addr & ~TARGET_PAGE_MASK) {
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/* IO access */
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if ((addr & (DATA_SIZE - 1)) != 0)
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goto do_unaligned_access;
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glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
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} else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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do_unaligned_access:
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/* XXX: not efficient, but simple */
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for(i = 0;i < DATA_SIZE; i++) {
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#ifdef TARGET_WORDS_BIGENDIAN
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slow_stb(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), retaddr);
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#else
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slow_stb(addr + i, val >> (i * 8), retaddr);
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#endif
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}
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} else {
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/* aligned/unaligned access in the same page */
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glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
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}
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} else {
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/* the page is not in the TLB : fill it */
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tlb_fill(addr, 1, retaddr);
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goto redo;
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}
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}
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#undef SHIFT
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#undef DATA_TYPE
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#undef SUFFIX
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#undef DATA_SIZE
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