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memory: add address_space_translate 

Using phys_page_find to translate an AddressSpace to a MemoryRegionSection
is unwieldy.  It requires to pass the page index rather than the address,
and later memory_region_section_addr has to be called.  Replace
memory_region_section_addr with a function that does all of it: call
phys_page_find, compute the offset within the region, and check how
big the current mapping is.  This way, a large flat region can be written
with a single lookup rather than a page at a time.

address_space_translate will also provide a single point where IOMMU
forwarding is implemented.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
master
Paolo Bonzini 2013-05-24 12:59:37 +02:00
parent b018ddf633
commit 149f54b53b
5 changed files with 131 additions and 130 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
cputlb.c
View File

@ -248,13 +248,18 @@ void tlb_set_page(CPUArchState *env, target_ulong vaddr,
target_ulong code_address;
uintptr_t addend;
CPUTLBEntry *te;
hwaddr iotlb;
hwaddr iotlb, xlat, sz;
assert(size >= TARGET_PAGE_SIZE);
if (size != TARGET_PAGE_SIZE) {
tlb_add_large_page(env, vaddr, size);
}
section = phys_page_find(address_space_memory.dispatch, paddr >> TARGET_PAGE_BITS);
sz = size;
section = address_space_translate(&address_space_memory, paddr, &xlat, &sz,
false);
assert(sz >= TARGET_PAGE_SIZE);
#if defined(DEBUG_TLB)
printf("tlb_set_page: vaddr=" TARGET_FMT_lx " paddr=0x" TARGET_FMT_plx
" prot=%x idx=%d pd=0x%08lx\n",
@ -268,13 +273,12 @@ void tlb_set_page(CPUArchState *env, target_ulong vaddr,
addend = 0;
} else {
/* TLB_MMIO for rom/romd handled below */
addend = (uintptr_t)memory_region_get_ram_ptr(section->mr)
+ memory_region_section_addr(section, paddr);
addend = (uintptr_t)memory_region_get_ram_ptr(section->mr) + xlat;
}
code_address = address;
iotlb = memory_region_section_get_iotlb(env, section, vaddr, paddr, prot,
&address);
iotlb = memory_region_section_get_iotlb(env, section, vaddr, paddr, xlat,
prot, &address);
index = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
env->iotlb[mmu_idx][index] = iotlb - vaddr;
@ -297,9 +301,7 @@ void tlb_set_page(CPUArchState *env, target_ulong vaddr,
/* Write access calls the I/O callback. */
te->addr_write = address | TLB_MMIO;
} else if (memory_region_is_ram(section->mr)
&& !cpu_physical_memory_is_dirty(
section->mr->ram_addr
+ memory_region_section_addr(section, paddr))) {
&& !cpu_physical_memory_is_dirty(section->mr->ram_addr + xlat)) {
te->addr_write = address | TLB_NOTDIRTY;
} else {
te->addr_write = address;

192
exec.c
View File

@ -182,7 +182,7 @@ static void phys_page_set(AddressSpaceDispatch *d,
phys_page_set_level(&d->phys_map, &index, &nb, leaf, P_L2_LEVELS - 1);
}
MemoryRegionSection *phys_page_find(AddressSpaceDispatch *d, hwaddr index)
static MemoryRegionSection *phys_page_find(AddressSpaceDispatch *d, hwaddr index)
{
PhysPageEntry lp = d->phys_map;
PhysPageEntry *p;
@ -203,6 +203,25 @@ bool memory_region_is_unassigned(MemoryRegion *mr)
return mr != &io_mem_rom && mr != &io_mem_notdirty && !mr->rom_device
&& mr != &io_mem_watch;
}
MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *plen,
bool is_write)
{
MemoryRegionSection *section;
Int128 diff;
section = phys_page_find(as->dispatch, addr >> TARGET_PAGE_BITS);
/* Compute offset within MemoryRegionSection */
addr -= section->offset_within_address_space;
/* Compute offset within MemoryRegion */
*xlat = addr + section->offset_within_region;
diff = int128_sub(section->mr->size, int128_make64(addr));
*plen = MIN(int128_get64(diff), *plen);
return section;
}
#endif
void cpu_exec_init_all(void)
@ -615,11 +634,11 @@ static int cpu_physical_memory_set_dirty_tracking(int enable)
}
hwaddr memory_region_section_get_iotlb(CPUArchState *env,
MemoryRegionSection *section,
target_ulong vaddr,
hwaddr paddr,
int prot,
target_ulong *address)
MemoryRegionSection *section,
target_ulong vaddr,
hwaddr paddr, hwaddr xlat,
int prot,
target_ulong *address)
{
hwaddr iotlb;
CPUWatchpoint *wp;
@ -627,7 +646,7 @@ hwaddr memory_region_section_get_iotlb(CPUArchState *env,
if (memory_region_is_ram(section->mr)) {
/* Normal RAM. */
iotlb = (memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK)
+ memory_region_section_addr(section, paddr);
+ xlat;
if (!section->readonly) {
iotlb |= phys_section_notdirty;
} else {
@ -635,7 +654,7 @@ hwaddr memory_region_section_get_iotlb(CPUArchState *env,
}
} else {
iotlb = section - phys_sections;
iotlb += memory_region_section_addr(section, paddr);
iotlb += xlat;
}
/* Make accesses to pages with watchpoints go via the
@ -1852,24 +1871,18 @@ static void invalidate_and_set_dirty(hwaddr addr,
void address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,
int len, bool is_write)
{
AddressSpaceDispatch *d = as->dispatch;
int l;
hwaddr l;
uint8_t *ptr;
uint32_t val;
hwaddr page;
hwaddr addr1;
MemoryRegionSection *section;
while (len > 0) {
page = addr & TARGET_PAGE_MASK;
l = (page + TARGET_PAGE_SIZE) - addr;
if (l > len)
l = len;
section = phys_page_find(d, page >> TARGET_PAGE_BITS);
l = len;
section = address_space_translate(as, addr, &addr1, &l, is_write);
if (is_write) {
if (!memory_region_is_ram(section->mr)) {
hwaddr addr1;
addr1 = memory_region_section_addr(section, addr);
/* XXX: could force cpu_single_env to NULL to avoid
potential bugs */
if (l >= 4 && ((addr1 & 3) == 0)) {
@ -1889,9 +1902,7 @@ void address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,
l = 1;
}
} else if (!section->readonly) {
ram_addr_t addr1;
addr1 = memory_region_get_ram_addr(section->mr)
+ memory_region_section_addr(section, addr);
addr1 += memory_region_get_ram_addr(section->mr);
/* RAM case */
ptr = qemu_get_ram_ptr(addr1);
memcpy(ptr, buf, l);
@ -1900,9 +1911,7 @@ void address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,
} else {
if (!(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr))) {
hwaddr addr1;
/* I/O case */
addr1 = memory_region_section_addr(section, addr);
if (l >= 4 && ((addr1 & 3) == 0)) {
/* 32 bit read access */
val = io_mem_read(section->mr, addr1, 4);
@ -1921,9 +1930,7 @@ void address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,
}
} else {
/* RAM case */
ptr = qemu_get_ram_ptr(section->mr->ram_addr
+ memory_region_section_addr(section,
addr));
ptr = qemu_get_ram_ptr(section->mr->ram_addr + addr1);
memcpy(buf, ptr, l);
}
}
@ -1962,26 +1969,21 @@ void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
void cpu_physical_memory_write_rom(hwaddr addr,
const uint8_t *buf, int len)
{
AddressSpaceDispatch *d = address_space_memory.dispatch;
int l;
hwaddr l;
uint8_t *ptr;
hwaddr page;
hwaddr addr1;
MemoryRegionSection *section;
while (len > 0) {
page = addr & TARGET_PAGE_MASK;
l = (page + TARGET_PAGE_SIZE) - addr;
if (l > len)
l = len;
section = phys_page_find(d, page >> TARGET_PAGE_BITS);
l = len;
section = address_space_translate(&address_space_memory,
addr, &addr1, &l, true);
if (!(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr))) {
/* do nothing */
} else {
unsigned long addr1;
addr1 = memory_region_get_ram_addr(section->mr)
+ memory_region_section_addr(section, addr);
addr1 += memory_region_get_ram_addr(section->mr);
/* ROM/RAM case */
ptr = qemu_get_ram_ptr(addr1);
memcpy(ptr, buf, l);
@ -2051,22 +2053,17 @@ void *address_space_map(AddressSpace *as,
hwaddr *plen,
bool is_write)
{
AddressSpaceDispatch *d = as->dispatch;
hwaddr len = *plen;
hwaddr todo = 0;
int l;
hwaddr page;
hwaddr l, xlat;
MemoryRegionSection *section;
ram_addr_t raddr = RAM_ADDR_MAX;
ram_addr_t rlen;
void *ret;
while (len > 0) {
page = addr & TARGET_PAGE_MASK;
l = (page + TARGET_PAGE_SIZE) - addr;
if (l > len)
l = len;
section = phys_page_find(d, page >> TARGET_PAGE_BITS);
l = len;
section = address_space_translate(as, addr, &xlat, &l, is_write);
if (!(memory_region_is_ram(section->mr) && !section->readonly)) {
if (todo || bounce.buffer) {
@ -2083,8 +2080,11 @@ void *address_space_map(AddressSpace *as,
return bounce.buffer;
}
if (!todo) {
raddr = memory_region_get_ram_addr(section->mr)
+ memory_region_section_addr(section, addr);
raddr = memory_region_get_ram_addr(section->mr) + xlat;
} else {
if (memory_region_get_ram_addr(section->mr) + xlat != raddr + todo) {
break;
}
}
len -= l;
@ -2150,14 +2150,16 @@ static inline uint32_t ldl_phys_internal(hwaddr addr,
uint8_t *ptr;
uint32_t val;
MemoryRegionSection *section;
hwaddr l = 4;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!(memory_region_is_ram(section->mr) ||
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
false);
if (l < 4 ||
!(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr))) {
/* I/O case */
addr = memory_region_section_addr(section, addr);
val = io_mem_read(section->mr, addr, 4);
val = io_mem_read(section->mr, addr1, 4);
#if defined(TARGET_WORDS_BIGENDIAN)
if (endian == DEVICE_LITTLE_ENDIAN) {
val = bswap32(val);
@ -2171,7 +2173,7 @@ static inline uint32_t ldl_phys_internal(hwaddr addr,
/* RAM case */
ptr = qemu_get_ram_ptr((memory_region_get_ram_addr(section->mr)
& TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr));
+ addr1);
switch (endian) {
case DEVICE_LITTLE_ENDIAN:
val = ldl_le_p(ptr);
@ -2209,28 +2211,30 @@ static inline uint64_t ldq_phys_internal(hwaddr addr,
uint8_t *ptr;
uint64_t val;
MemoryRegionSection *section;
hwaddr l = 8;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!(memory_region_is_ram(section->mr) ||
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
false);
if (l < 8 ||
!(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr))) {
/* I/O case */
addr = memory_region_section_addr(section, addr);
/* XXX This is broken when device endian != cpu endian.
Fix and add "endian" variable check */
#ifdef TARGET_WORDS_BIGENDIAN
val = io_mem_read(section->mr, addr, 4) << 32;
val |= io_mem_read(section->mr, addr + 4, 4);
val = io_mem_read(section->mr, addr1, 4) << 32;
val |= io_mem_read(section->mr, addr1 + 4, 4);
#else
val = io_mem_read(section->mr, addr, 4);
val |= io_mem_read(section->mr, addr + 4, 4) << 32;
val = io_mem_read(section->mr, addr1, 4);
val |= io_mem_read(section->mr, addr1 + 4, 4) << 32;
#endif
} else {
/* RAM case */
ptr = qemu_get_ram_ptr((memory_region_get_ram_addr(section->mr)
& TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr));
+ addr1);
switch (endian) {
case DEVICE_LITTLE_ENDIAN:
val = ldq_le_p(ptr);
@ -2276,14 +2280,16 @@ static inline uint32_t lduw_phys_internal(hwaddr addr,
uint8_t *ptr;
uint64_t val;
MemoryRegionSection *section;
hwaddr l = 2;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!(memory_region_is_ram(section->mr) ||
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
false);
if (l < 2 ||
!(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr))) {
/* I/O case */
addr = memory_region_section_addr(section, addr);
val = io_mem_read(section->mr, addr, 2);
val = io_mem_read(section->mr, addr1, 2);
#if defined(TARGET_WORDS_BIGENDIAN)
if (endian == DEVICE_LITTLE_ENDIAN) {
val = bswap16(val);
@ -2297,7 +2303,7 @@ static inline uint32_t lduw_phys_internal(hwaddr addr,
/* RAM case */
ptr = qemu_get_ram_ptr((memory_region_get_ram_addr(section->mr)
& TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr));
+ addr1);
switch (endian) {
case DEVICE_LITTLE_ENDIAN:
val = lduw_le_p(ptr);
@ -2335,19 +2341,18 @@ void stl_phys_notdirty(hwaddr addr, uint32_t val)
{
uint8_t *ptr;
MemoryRegionSection *section;
hwaddr l = 4;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!memory_region_is_ram(section->mr) || section->readonly) {
addr = memory_region_section_addr(section, addr);
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
true);
if (l < 4 || !memory_region_is_ram(section->mr) || section->readonly) {
if (memory_region_is_ram(section->mr)) {
section = &phys_sections[phys_section_rom];
}
io_mem_write(section->mr, addr, val, 4);
io_mem_write(section->mr, addr1, val, 4);
} else {
unsigned long addr1 = (memory_region_get_ram_addr(section->mr)
& TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr);
addr1 += memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK;
ptr = qemu_get_ram_ptr(addr1);
stl_p(ptr, val);
@ -2369,11 +2374,12 @@ static inline void stl_phys_internal(hwaddr addr, uint32_t val,
{
uint8_t *ptr;
MemoryRegionSection *section;
hwaddr l = 4;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!memory_region_is_ram(section->mr) || section->readonly) {
addr = memory_region_section_addr(section, addr);
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
true);
if (l < 4 || !memory_region_is_ram(section->mr) || section->readonly) {
if (memory_region_is_ram(section->mr)) {
section = &phys_sections[phys_section_rom];
}
@ -2386,12 +2392,10 @@ static inline void stl_phys_internal(hwaddr addr, uint32_t val,
val = bswap32(val);
}
#endif
io_mem_write(section->mr, addr, val, 4);
io_mem_write(section->mr, addr1, val, 4);
} else {
unsigned long addr1;
addr1 = (memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr);
/* RAM case */
addr1 += memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK;
ptr = qemu_get_ram_ptr(addr1);
switch (endian) {
case DEVICE_LITTLE_ENDIAN:
@ -2436,11 +2440,12 @@ static inline void stw_phys_internal(hwaddr addr, uint32_t val,
{
uint8_t *ptr;
MemoryRegionSection *section;
hwaddr l = 2;
hwaddr addr1;
section = phys_page_find(address_space_memory.dispatch, addr >> TARGET_PAGE_BITS);
if (!memory_region_is_ram(section->mr) || section->readonly) {
addr = memory_region_section_addr(section, addr);
section = address_space_translate(&address_space_memory, addr, &addr1, &l,
true);
if (l < 2 || !memory_region_is_ram(section->mr) || section->readonly) {
if (memory_region_is_ram(section->mr)) {
section = &phys_sections[phys_section_rom];
}
@ -2453,12 +2458,10 @@ static inline void stw_phys_internal(hwaddr addr, uint32_t val,
val = bswap16(val);
}
#endif
io_mem_write(section->mr, addr, val, 2);
io_mem_write(section->mr, addr1, val, 2);
} else {
unsigned long addr1;
addr1 = (memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr);
/* RAM case */
addr1 += memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK;
ptr = qemu_get_ram_ptr(addr1);
switch (endian) {
case DEVICE_LITTLE_ENDIAN:
@ -2561,9 +2564,10 @@ bool virtio_is_big_endian(void)
bool cpu_physical_memory_is_io(hwaddr phys_addr)
{
MemoryRegionSection *section;
hwaddr l = 1;
section = phys_page_find(address_space_memory.dispatch,
phys_addr >> TARGET_PAGE_BITS);
section = address_space_translate(&address_space_memory,
phys_addr, &phys_addr, &l, false);
return !(memory_region_is_ram(section->mr) ||
memory_region_is_romd(section->mr));

12
include/exec/cputlb.h
View File

@ -26,8 +26,6 @@ void tlb_unprotect_code_phys(CPUArchState *env, ram_addr_t ram_addr,
target_ulong vaddr);
void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry, uintptr_t start,
uintptr_t length);
MemoryRegionSection *phys_page_find(struct AddressSpaceDispatch *d,
hwaddr index);
void cpu_tlb_reset_dirty_all(ram_addr_t start1, ram_addr_t length);
void tlb_set_dirty(CPUArchState *env, target_ulong vaddr);
extern int tlb_flush_count;
@ -35,11 +33,11 @@ extern int tlb_flush_count;
/* exec.c */
void tb_flush_jmp_cache(CPUArchState *env, target_ulong addr);
hwaddr memory_region_section_get_iotlb(CPUArchState *env,
MemoryRegionSection *section,
target_ulong vaddr,
hwaddr paddr,
int prot,
target_ulong *address);
MemoryRegionSection *section,
target_ulong vaddr,
hwaddr paddr, hwaddr xlat,
int prot,
target_ulong *address);
bool memory_region_is_unassigned(MemoryRegion *mr);
#endif

31
include/exec/memory.h
View File

@ -751,23 +751,6 @@ void memory_region_set_alias_offset(MemoryRegion *mr,
MemoryRegionSection memory_region_find(MemoryRegion *mr,
hwaddr addr, uint64_t size);
/**
* memory_region_section_addr: get offset within MemoryRegionSection
*
* Returns offset within MemoryRegionSection
*
* @section: the memory region section being queried
* @addr: address in address space
*/
static inline hwaddr
memory_region_section_addr(MemoryRegionSection *section,
hwaddr addr)
{
addr -= section->offset_within_address_space;
addr += section->offset_within_region;
return addr;
}
/**
* address_space_sync_dirty_bitmap: synchronize the dirty log for all memory
*
@ -869,6 +852,20 @@ void address_space_write(AddressSpace *as, hwaddr addr,
*/
void address_space_read(AddressSpace *as, hwaddr addr, uint8_t *buf, int len);
/* address_space_translate: translate an address range into an address space
* into a MemoryRegionSection and an address range into that section
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @xlat: pointer to address within the returned memory region section's
* #MemoryRegion.
* @len: pointer to length
* @is_write: indicates the transfer direction
*/
MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *len,
bool is_write);
/* address_space_map: map a physical memory region into a host virtual address
*
* May map a subset of the requested range, given by and returned in @plen.

6
translate-all.c
View File

@ -1354,15 +1354,15 @@ void tb_invalidate_phys_addr(hwaddr addr)
{
ram_addr_t ram_addr;
MemoryRegionSection *section;
hwaddr l = 1;
section = phys_page_find(address_space_memory.dispatch,
addr >> TARGET_PAGE_BITS);
section = address_space_translate(&address_space_memory, addr, &addr, &l, false);
if (!(memory_region_is_ram(section->mr)
|| memory_region_is_romd(section->mr))) {
return;
}
ram_addr = (memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK)
+ memory_region_section_addr(section, addr);
+ addr;
tb_invalidate_phys_page_range(ram_addr, ram_addr + 1, 0);
}
#endif /* TARGET_HAS_ICE && !defined(CONFIG_USER_ONLY) */