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Add target memory mapping API (Avi Kivity)

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Devices accessing large amounts of memory (as with DMA) will wish to obtain
a pointer to guest memory rather than access it indirectly via
cpu_physical_memory_rw().  Add a new API to convert target addresses to
host pointers.

In case the target address does not correspond to RAM, a bounce buffer is
allocated.  To prevent the guest from causing the host to allocate unbounded
amounts of bounce buffer, this memory is limited (currently to one page).

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6394 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-22 16:59:11 +00:00
parent d268de04f2
commit 6d16c2f88f
2 changed files with 108 additions and 0 deletions
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6
cpu-all.h
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@ -923,6 +923,12 @@ static inline void cpu_physical_memory_write(target_phys_addr_t addr,
{
cpu_physical_memory_rw(addr, (uint8_t *)buf, len, 1);
}
void *cpu_physical_memory_map(target_phys_addr_t addr,
target_phys_addr_t *plen,
int is_write);
void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len,
int is_write, target_phys_addr_t access_len);
uint32_t ldub_phys(target_phys_addr_t addr);
uint32_t lduw_phys(target_phys_addr_t addr);
uint32_t ldl_phys(target_phys_addr_t addr);