a4193c8a4b
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@874 c046a42c-6fe2-441c-8c8c-71466251a162
265 lines
9.8 KiB
C
265 lines
9.8 KiB
C
/*
|
|
* 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 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
|
|
|
|
static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
int is_user,
|
|
void *retaddr);
|
|
static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
DATA_TYPE val,
|
|
int is_user,
|
|
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](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;
|
|
}
|
|
|
|
static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
|
|
DATA_TYPE val,
|
|
unsigned long tlb_addr,
|
|
void *retaddr)
|
|
{
|
|
int index;
|
|
|
|
index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
|
|
env->mem_write_vaddr = tlb_addr;
|
|
env->mem_write_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 */
|
|
}
|
|
|
|
/* handle all cases except unaligned access which span two pages */
|
|
DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
int is_user)
|
|
{
|
|
DATA_TYPE res;
|
|
int 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 */
|
|
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 = GETPC();
|
|
res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr,
|
|
is_user, retaddr);
|
|
} else {
|
|
/* unaligned access in the same page */
|
|
res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
|
|
}
|
|
} else {
|
|
/* the page is not in the TLB : fill it */
|
|
retaddr = GETPC();
|
|
tlb_fill(addr, 0, is_user, retaddr);
|
|
goto redo;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* handle all unaligned cases */
|
|
static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
int is_user,
|
|
void *retaddr)
|
|
{
|
|
DATA_TYPE res, res1, res2;
|
|
int index, shift;
|
|
unsigned long physaddr, tlb_addr, addr1, addr2;
|
|
|
|
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(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1,
|
|
is_user, retaddr);
|
|
res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2,
|
|
is_user, 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 */
|
|
res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
|
|
}
|
|
} else {
|
|
/* the page is not in the TLB : fill it */
|
|
tlb_fill(addr, 0, is_user, retaddr);
|
|
goto redo;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
DATA_TYPE val,
|
|
int is_user)
|
|
{
|
|
unsigned long physaddr, tlb_addr;
|
|
void *retaddr;
|
|
int index;
|
|
|
|
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_write[is_user][index].addend;
|
|
if (tlb_addr & ~TARGET_PAGE_MASK) {
|
|
/* IO access */
|
|
if ((addr & (DATA_SIZE - 1)) != 0)
|
|
goto do_unaligned_access;
|
|
retaddr = GETPC();
|
|
glue(io_write, SUFFIX)(physaddr, val, tlb_addr, retaddr);
|
|
} else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
|
|
do_unaligned_access:
|
|
retaddr = GETPC();
|
|
glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val,
|
|
is_user, 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 = GETPC();
|
|
tlb_fill(addr, 1, is_user, retaddr);
|
|
goto redo;
|
|
}
|
|
}
|
|
|
|
/* handles all unaligned cases */
|
|
static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
|
|
DATA_TYPE val,
|
|
int is_user,
|
|
void *retaddr)
|
|
{
|
|
unsigned long physaddr, tlb_addr;
|
|
int index, i;
|
|
|
|
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_write[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, retaddr);
|
|
} 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
|
|
glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)),
|
|
is_user, retaddr);
|
|
#else
|
|
glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8),
|
|
is_user, 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, is_user, retaddr);
|
|
goto redo;
|
|
}
|
|
}
|
|
|
|
#undef SHIFT
|
|
#undef DATA_TYPE
|
|
#undef SUFFIX
|
|
#undef USUFFIX
|
|
#undef DATA_SIZE
|