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exec: reorganize mem_add to match Int128 version 

When adding support for 2^64-byte sections, we will have to change
the structure of mem_add to avoid failures in int128_get64.
Reorganize the code now before introducing Int128.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-05-27 10:47:10 +02:00
parent 5b23fd0332
commit 733d5ef527
1 changed files with 16 additions and 23 deletions
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39
exec.c
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@ -824,15 +824,11 @@ static void register_subpage(AddressSpaceDispatch *d, MemoryRegionSection *secti
static void register_multipage(AddressSpaceDispatch *d, MemoryRegionSection *section)
{
hwaddr start_addr = section->offset_within_address_space;
ram_addr_t size = section->size;
hwaddr addr;
uint16_t section_index = phys_section_add(section);
uint64_t num_pages = section->size >> TARGET_PAGE_BITS;
assert(size);
addr = start_addr;
phys_page_set(d, addr >> TARGET_PAGE_BITS, size >> TARGET_PAGE_BITS,
section_index);
assert(num_pages);
phys_page_set(d, start_addr >> TARGET_PAGE_BITS, num_pages, section_index);
}
static void mem_add(MemoryListener *listener, MemoryRegionSection *section)
@ -840,32 +836,29 @@ static void mem_add(MemoryListener *listener, MemoryRegionSection *section)
AddressSpaceDispatch *d = container_of(listener, AddressSpaceDispatch, listener);
MemoryRegionSection now = *section, remain = *section;
if ((now.offset_within_address_space & ~TARGET_PAGE_MASK)
|| (now.size < TARGET_PAGE_SIZE)) {
now.size = MIN(TARGET_PAGE_ALIGN(now.offset_within_address_space)
- now.offset_within_address_space,
now.size);
if (now.offset_within_address_space & ~TARGET_PAGE_MASK) {
uint64_t left = TARGET_PAGE_ALIGN(now.offset_within_address_space)
- now.offset_within_address_space;
now.size = MIN(left, now.size);
register_subpage(d, &now);
} else {
now.size = 0;
}
while (remain.size != now.size) {
remain.size -= now.size;
remain.offset_within_address_space += now.size;
remain.offset_within_region += now.size;
}
while (remain.size >= TARGET_PAGE_SIZE) {
now = remain;
if (remain.offset_within_region & ~TARGET_PAGE_MASK) {
if (remain.size < TARGET_PAGE_SIZE) {
register_subpage(d, &now);
} else if (remain.offset_within_region & ~TARGET_PAGE_MASK) {
now.size = TARGET_PAGE_SIZE;
register_subpage(d, &now);
} else {
now.size &= TARGET_PAGE_MASK;
now.size &= -TARGET_PAGE_SIZE;
register_multipage(d, &now);
}
remain.size -= now.size;
remain.offset_within_address_space += now.size;
remain.offset_within_region += now.size;
}
now = remain;
if (now.size) {
register_subpage(d, &now);
}
}