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exec: allow to get a pointer for some mmio memory region

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This introduces a special callback which allows to run code from some MMIO
devices.

SysBusDevice with a MemoryRegion which implements the request_ptr callback will
be notified when the guest try to execute code from their offset. Then it will
be able to eg: pre-load some code from an SPI device or ask a pointer from an
external simulator, etc..

When the pointer or the data in it are no longer valid the device has to
invalidate it.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
KONRAD Frederic
2016-10-19 15:06:49 +02:00
committed by Edgar E. Iglesias
parent 7cc2298c46
commit c935674635
3 changed files with 156 additions and 0 deletions
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accel/tcg/cputlb.c
+10
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@@ -858,6 +858,16 @@ tb_page_addr_t get_page_addr_code(CPUArchState *env, target_ulong addr)
pd = iotlbentry->addr & ~TARGET_PAGE_MASK;
mr = iotlb_to_region(cpu, pd, iotlbentry->attrs);
if (memory_region_is_unassigned(mr)) {
qemu_mutex_lock_iothread();
if (memory_region_request_mmio_ptr(mr, addr)) {
qemu_mutex_unlock_iothread();
/* A MemoryRegion is potentially added so re-run the
* get_page_addr_code.
*/
return get_page_addr_code(env, addr);
}
qemu_mutex_unlock_iothread();
cpu_unassigned_access(cpu, addr, false, true, 0, 4);
/* The CPU's unassigned access hook might have longjumped out
* with an exception. If it didn't (or there was no hook) then