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b92e5a22ec
qemu/softmmu_template.h
bellard b92e5a22ec 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
2003-08-08 23:58:05 +00:00

242 lines
8.3 KiB
C
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/*
* 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 __attribute((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 __attribute((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
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