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exec: introduce MemoryRegionCache

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Device models often have to perform multiple access to a single
memory region that is known in advance, but would to use "DMA-style"
functions instead of address_space_map/unmap.  This can happen
for example when the data has to undergo endianness conversion.
Introduce a new data structure to cache the result of
address_space_translate without forcing usage of a host address
like address_space_map does.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-22 12:04:52 +01:00
parent 715c31ec8e
commit 1f4e496e1f
4 changed files with 251 additions and 0 deletions
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23
include/exec/cpu-all.h
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@ -186,6 +186,29 @@ void address_space_stl(AddressSpace *as, hwaddr addr, uint32_t val,
MemTxAttrs attrs, MemTxResult *result);
void address_space_stq(AddressSpace *as, hwaddr addr, uint64_t val,
MemTxAttrs attrs, MemTxResult *result);
uint32_t lduw_phys_cached(MemoryRegionCache *cache, hwaddr addr);
uint32_t ldl_phys_cached(MemoryRegionCache *cache, hwaddr addr);
uint64_t ldq_phys_cached(MemoryRegionCache *cache, hwaddr addr);
void stl_phys_notdirty_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val);
void stw_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val);
void stl_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val);
void stq_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint64_t val);
uint32_t address_space_lduw_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs, MemTxResult *result);
uint32_t address_space_ldl_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs, MemTxResult *result);
uint64_t address_space_ldq_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs, MemTxResult *result);
void address_space_stl_notdirty_cached(MemoryRegionCache *cache, hwaddr addr,
uint32_t val, MemTxAttrs attrs, MemTxResult *result);
void address_space_stw_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val,
MemTxAttrs attrs, MemTxResult *result);
void address_space_stl_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val,
MemTxAttrs attrs, MemTxResult *result);
void address_space_stq_cached(MemoryRegionCache *cache, hwaddr addr, uint64_t val,
MemTxAttrs attrs, MemTxResult *result);
#endif
/* page related stuff */