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memory: use 128-bit integers for sizes and intermediates 

Since the memory API supports 64-bit buses, it needs a larger type to represent
intermediate results.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-10-16 13:19:17 +02:00
parent b7cd3db6f4
commit 08dafab4bd
2 changed files with 115 additions and 81 deletions
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193
memory.c
View File

@ -28,43 +28,48 @@ typedef struct AddrRange AddrRange;
* (large MemoryRegion::alias_offset).
*/
struct AddrRange {
int64_t start;
int64_t size;
Int128 start;
Int128 size;
};
static AddrRange addrrange_make(int64_t start, int64_t size)
static AddrRange addrrange_make(Int128 start, Int128 size)
{
return (AddrRange) { start, size };
}
static bool addrrange_equal(AddrRange r1, AddrRange r2)
{
return r1.start == r2.start && r1.size == r2.size;
return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
}
static int64_t addrrange_end(AddrRange r)
static Int128 addrrange_end(AddrRange r)
{
return r.start + r.size;
return int128_add(r.start, r.size);
}
static AddrRange addrrange_shift(AddrRange range, int64_t delta)
static AddrRange addrrange_shift(AddrRange range, Int128 delta)
{
range.start += delta;
int128_addto(&range.start, delta);
return range;
}
static bool addrrange_contains(AddrRange range, Int128 addr)
{
return int128_ge(addr, range.start)
&& int128_lt(addr, addrrange_end(range));
}
static bool addrrange_intersects(AddrRange r1, AddrRange r2)
{
return (r1.start >= r2.start && (r1.start - r2.start) < r2.size)
|| (r2.start >= r1.start && (r2.start - r1.start) < r1.size);
return addrrange_contains(r1, r2.start)
|| addrrange_contains(r2, r1.start);
}
static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
{
int64_t start = MAX(r1.start, r2.start);
/* off-by-one arithmetic to prevent overflow */
int64_t end = MIN(addrrange_end(r1) - 1, addrrange_end(r2) - 1);
return addrrange_make(start, end - start + 1);
Int128 start = int128_max(r1.start, r2.start);
Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
return addrrange_make(start, int128_sub(end, start));
}
struct CoalescedMemoryRange {
@ -82,13 +87,13 @@ struct MemoryRegionIoeventfd {
static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
MemoryRegionIoeventfd b)
{
if (a.addr.start < b.addr.start) {
if (int128_lt(a.addr.start, b.addr.start)) {
return true;
} else if (a.addr.start > b.addr.start) {
} else if (int128_gt(a.addr.start, b.addr.start)) {
return false;
} else if (a.addr.size < b.addr.size) {
} else if (int128_lt(a.addr.size, b.addr.size)) {
return true;
} else if (a.addr.size > b.addr.size) {
} else if (int128_gt(a.addr.size, b.addr.size)) {
return false;
} else if (a.match_data < b.match_data) {
return true;
@ -201,9 +206,11 @@ static void flatview_destroy(FlatView *view)
static bool can_merge(FlatRange *r1, FlatRange *r2)
{
return addrrange_end(r1->addr) == r2->addr.start
return int128_eq(addrrange_end(r1->addr), r2->addr.start)
&& r1->mr == r2->mr
&& r1->offset_in_region + r1->addr.size == r2->offset_in_region
&& int128_eq(int128_add(int128_make64(r1->offset_in_region),
r1->addr.size),
int128_make64(r2->offset_in_region))
&& r1->dirty_log_mask == r2->dirty_log_mask
&& r1->readable == r2->readable
&& r1->readonly == r2->readonly;
@ -219,7 +226,7 @@ static void flatview_simplify(FlatView *view)
j = i + 1;
while (j < view->nr
&& can_merge(&view->ranges[j-1], &view->ranges[j])) {
view->ranges[i].addr.size += view->ranges[j].addr.size;
int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
++j;
}
++i;
@ -314,8 +321,8 @@ static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
phys_offset |= IO_MEM_ROM;
}
cpu_register_physical_memory_log(fr->addr.start,
fr->addr.size,
cpu_register_physical_memory_log(int128_get64(fr->addr.start),
int128_get64(fr->addr.size),
phys_offset,
region_offset,
fr->dirty_log_mask);
@ -324,30 +331,35 @@ static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
{
if (fr->dirty_log_mask) {
cpu_physical_sync_dirty_bitmap(fr->addr.start,
fr->addr.start + fr->addr.size);
Int128 end = addrrange_end(fr->addr);
cpu_physical_sync_dirty_bitmap(int128_get64(fr->addr.start),
int128_get64(end));
}
cpu_register_physical_memory(fr->addr.start, fr->addr.size,
cpu_register_physical_memory(int128_get64(fr->addr.start),
int128_get64(fr->addr.size),
IO_MEM_UNASSIGNED);
}
static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
{
cpu_physical_log_start(fr->addr.start, fr->addr.size);
cpu_physical_log_start(int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
}
static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
{
cpu_physical_log_stop(fr->addr.start, fr->addr.size);
cpu_physical_log_stop(int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
}
static void as_memory_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
{
int r;
assert(fd->match_data && fd->addr.size == 4);
assert(fd->match_data && int128_get64(fd->addr.size) == 4);
r = kvm_set_ioeventfd_mmio_long(fd->fd, fd->addr.start, fd->data, true);
r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
fd->data, true);
if (r < 0) {
abort();
}
@ -357,7 +369,8 @@ static void as_memory_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
{
int r;
r = kvm_set_ioeventfd_mmio_long(fd->fd, fd->addr.start, fd->data, false);
r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
fd->data, false);
if (r < 0) {
abort();
}
@ -453,22 +466,24 @@ static const IORangeOps memory_region_iorange_ops = {
static void as_io_range_add(AddressSpace *as, FlatRange *fr)
{
iorange_init(&fr->mr->iorange, &memory_region_iorange_ops,
fr->addr.start,fr->addr.size);
int128_get64(fr->addr.start), int128_get64(fr->addr.size));
ioport_register(&fr->mr->iorange);
}
static void as_io_range_del(AddressSpace *as, FlatRange *fr)
{
isa_unassign_ioport(fr->addr.start, fr->addr.size);
isa_unassign_ioport(int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
}
static void as_io_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
{
int r;
assert(fd->match_data && fd->addr.size == 2);
assert(fd->match_data && int128_get64(fd->addr.size) == 2);
r = kvm_set_ioeventfd_pio_word(fd->fd, fd->addr.start, fd->data, true);
r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
fd->data, true);
if (r < 0) {
abort();
}
@ -478,7 +493,8 @@ static void as_io_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
{
int r;
r = kvm_set_ioeventfd_pio_word(fd->fd, fd->addr.start, fd->data, false);
r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
fd->data, false);
if (r < 0) {
abort();
}
@ -500,19 +516,19 @@ static AddressSpace address_space_io = {
*/
static void render_memory_region(FlatView *view,
MemoryRegion *mr,
target_phys_addr_t base,
Int128 base,
AddrRange clip,
bool readonly)
{
MemoryRegion *subregion;
unsigned i;
target_phys_addr_t offset_in_region;
int64_t remain;
int64_t now;
Int128 remain;
Int128 now;
FlatRange fr;
AddrRange tmp;
base += mr->addr;
int128_addto(&base, int128_make64(mr->addr));
readonly |= mr->readonly;
tmp = addrrange_make(base, mr->size);
@ -524,8 +540,8 @@ static void render_memory_region(FlatView *view,
clip = addrrange_intersection(tmp, clip);
if (mr->alias) {
base -= mr->alias->addr;
base -= mr->alias_offset;
int128_subfrom(&base, int128_make64(mr->alias->addr));
int128_subfrom(&base, int128_make64(mr->alias_offset));
render_memory_region(view, mr->alias, base, clip, readonly);
return;
}
@ -539,17 +555,18 @@ static void render_memory_region(FlatView *view,
return;
}
offset_in_region = clip.start - base;
offset_in_region = int128_get64(int128_sub(clip.start, base));
base = clip.start;
remain = clip.size;
/* Render the region itself into any gaps left by the current view. */
for (i = 0; i < view->nr && remain; ++i) {
if (base >= addrrange_end(view->ranges[i].addr)) {
for (i = 0; i < view->nr && int128_nz(remain); ++i) {
if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
continue;
}
if (base < view->ranges[i].addr.start) {
now = MIN(remain, view->ranges[i].addr.start - base);
if (int128_lt(base, view->ranges[i].addr.start)) {
now = int128_min(remain,
int128_sub(view->ranges[i].addr.start, base));
fr.mr = mr;
fr.offset_in_region = offset_in_region;
fr.addr = addrrange_make(base, now);
@ -558,18 +575,18 @@ static void render_memory_region(FlatView *view,
fr.readonly = readonly;
flatview_insert(view, i, &fr);
++i;
base += now;
offset_in_region += now;
remain -= now;
int128_addto(&base, now);
offset_in_region += int128_get64(now);
int128_subfrom(&remain, now);
}
if (base == view->ranges[i].addr.start) {
now = MIN(remain, view->ranges[i].addr.size);
base += now;
offset_in_region += now;
remain -= now;
if (int128_eq(base, view->ranges[i].addr.start)) {
now = int128_min(remain, view->ranges[i].addr.size);
int128_addto(&base, now);
offset_in_region += int128_get64(now);
int128_subfrom(&remain, now);
}
}
if (remain) {
if (int128_nz(remain)) {
fr.mr = mr;
fr.offset_in_region = offset_in_region;
fr.addr = addrrange_make(base, remain);
@ -587,7 +604,8 @@ static FlatView generate_memory_topology(MemoryRegion *mr)
flatview_init(&view);
render_memory_region(&view, mr, 0, addrrange_make(0, INT64_MAX), false);
render_memory_region(&view, mr, int128_zero(),
addrrange_make(int128_zero(), int128_2_64()), false);
flatview_simplify(&view);
return view;
@ -637,7 +655,8 @@ static void address_space_update_ioeventfds(AddressSpace *as)
FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
fr->addr.start - fr->offset_in_region);
int128_sub(fr->addr.start,
int128_make64(fr->offset_in_region)));
if (addrrange_intersects(fr->addr, tmp)) {
++ioeventfd_nb;
ioeventfds = g_realloc(ioeventfds,
@ -682,8 +701,8 @@ static void address_space_update_topology_pass(AddressSpace *as,
if (frold
&& (!frnew
|| frold->addr.start < frnew->addr.start
|| (frold->addr.start == frnew->addr.start
|| int128_lt(frold->addr.start, frnew->addr.start)
|| (int128_eq(frold->addr.start, frnew->addr.start)
&& !flatrange_equal(frold, frnew)))) {
/* In old, but (not in new, or in new but attributes changed). */
@ -788,7 +807,10 @@ void memory_region_init(MemoryRegion *mr,
{
mr->ops = NULL;
mr->parent = NULL;
mr->size = size;
mr->size = int128_make64(size);
if (size == UINT64_MAX) {
mr->size = int128_2_64();
}
mr->addr = 0;
mr->offset = 0;
mr->terminates = false;
@ -1014,7 +1036,10 @@ void memory_region_destroy(MemoryRegion *mr)
uint64_t memory_region_size(MemoryRegion *mr)
{
return mr->size;
if (int128_eq(mr->size, int128_2_64())) {
return UINT64_MAX;
}
return int128_get64(mr->size);
}
void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
@ -1049,8 +1074,8 @@ void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
if (fr->mr == mr) {
cpu_physical_sync_dirty_bitmap(fr->addr.start,
fr->addr.start + fr->addr.size);
cpu_physical_sync_dirty_bitmap(int128_get64(fr->addr.start),
int128_get64(addrrange_end(fr->addr)));
}
}
}
@ -1099,15 +1124,18 @@ static void memory_region_update_coalesced_range(MemoryRegion *mr)
FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
if (fr->mr == mr) {
qemu_unregister_coalesced_mmio(fr->addr.start, fr->addr.size);
qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
tmp = addrrange_shift(cmr->addr,
fr->addr.start - fr->offset_in_region);
int128_sub(fr->addr.start,
int128_make64(fr->offset_in_region)));
if (!addrrange_intersects(tmp, fr->addr)) {
continue;
}
tmp = addrrange_intersection(tmp, fr->addr);
qemu_register_coalesced_mmio(tmp.start, tmp.size);
qemu_register_coalesced_mmio(int128_get64(tmp.start),
int128_get64(tmp.size));
}
}
}
@ -1116,7 +1144,7 @@ static void memory_region_update_coalesced_range(MemoryRegion *mr)
void memory_region_set_coalescing(MemoryRegion *mr)
{
memory_region_clear_coalescing(mr);
memory_region_add_coalescing(mr, 0, mr->size);
memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
}
void memory_region_add_coalescing(MemoryRegion *mr,
@ -1125,7 +1153,7 @@ void memory_region_add_coalescing(MemoryRegion *mr,
{
CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
cmr->addr = addrrange_make(offset, size);
cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
memory_region_update_coalesced_range(mr);
}
@ -1150,8 +1178,8 @@ void memory_region_add_eventfd(MemoryRegion *mr,
int fd)
{
MemoryRegionIoeventfd mrfd = {
.addr.start = addr,
.addr.size = size,
.addr.start = int128_make64(addr),
.addr.size = int128_make64(size),
.match_data = match_data,
.data = data,
.fd = fd,
@ -1180,8 +1208,8 @@ void memory_region_del_eventfd(MemoryRegion *mr,
int fd)
{
MemoryRegionIoeventfd mrfd = {
.addr.start = addr,
.addr.size = size,
.addr.start = int128_make64(addr),
.addr.size = int128_make64(size),
.match_data = match_data,
.data = data,
.fd = fd,
@ -1215,18 +1243,20 @@ static void memory_region_add_subregion_common(MemoryRegion *mr,
if (subregion->may_overlap || other->may_overlap) {
continue;
}
if (offset >= other->addr + other->size
|| offset + subregion->size <= other->addr) {
if (int128_gt(int128_make64(offset),
int128_add(int128_make64(other->addr), other->size))
|| int128_le(int128_add(int128_make64(offset), subregion->size),
int128_make64(other->addr))) {
continue;
}
#if 0
printf("warning: subregion collision %llx/%llx (%s) "
"vs %llx/%llx (%s)\n",
(unsigned long long)offset,
(unsigned long long)subregion->size,
(unsigned long long)int128_get64(subregion->size),
subregion->name,
(unsigned long long)other->addr,
(unsigned long long)other->size,
(unsigned long long)int128_get64(other->size),
other->name);
#endif
}
@ -1330,16 +1360,19 @@ static void mtree_print_mr(fprintf_function mon_printf, void *f,
mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): alias %s @%s "
TARGET_FMT_plx "-" TARGET_FMT_plx "\n",
base + mr->addr,
base + mr->addr + (target_phys_addr_t)mr->size - 1,
base + mr->addr
+ (target_phys_addr_t)int128_get64(mr->size) - 1,
mr->priority,
mr->name,
mr->alias->name,
mr->alias_offset,
mr->alias_offset + (target_phys_addr_t)mr->size - 1);
mr->alias_offset
+ (target_phys_addr_t)int128_get64(mr->size) - 1);
} else {
mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): %s\n",
base + mr->addr,
base + mr->addr + (target_phys_addr_t)mr->size - 1,
base + mr->addr
+ (target_phys_addr_t)int128_get64(mr->size) - 1,
mr->priority,
mr->name);
}

3
memory.h
View File

@ -24,6 +24,7 @@
#include "qemu-queue.h"
#include "iorange.h"
#include "ioport.h"
#include "int128.h"
typedef struct MemoryRegionOps MemoryRegionOps;
typedef struct MemoryRegion MemoryRegion;
@ -105,7 +106,7 @@ struct MemoryRegion {
const MemoryRegionOps *ops;
void *opaque;
MemoryRegion *parent;
uint64_t size;
Int128 size;
target_phys_addr_t addr;
target_phys_addr_t offset;
bool backend_registered;