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memory: add address_space_translate

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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>
This commit is contained in:
Paolo Bonzini 2013-05-24 12:59:37 +02:00
parent b018ddf633
commit 149f54b53b
5 changed files with 131 additions and 130 deletions
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6
translate-all.c
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@ -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) */