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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When the pointer or the data in it are no longer valid the device has to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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35
include/exec/memory.h
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@@ -137,6 +137,15 @@ struct MemoryRegionOps {
uint64_t data,
unsigned size,
MemTxAttrs attrs);
/* Instruction execution pre-callback:
* @addr is the address of the access relative to the @mr.
* @size is the size of the area returned by the callback.
* @offset is the location of the pointer inside @mr.
*
* Returns a pointer to a location which contains guest code.
*/
void *(*request_ptr)(void *opaque, hwaddr addr, unsigned *size,
unsigned *offset);
enum device_endian endianness;
/* Guest-visible constraints: */
@@ -1362,6 +1371,32 @@ void memory_global_dirty_log_stop(void);
void mtree_info(fprintf_function mon_printf, void *f, bool flatview);
/**
* memory_region_request_mmio_ptr: request a pointer to an mmio
* MemoryRegion. If it is possible map a RAM MemoryRegion with this pointer.
* When the device wants to invalidate the pointer it will call
* memory_region_invalidate_mmio_ptr.
*
* @mr: #MemoryRegion to check
* @addr: address within that region
*
* Returns true on success, false otherwise.
*/
bool memory_region_request_mmio_ptr(MemoryRegion *mr, hwaddr addr);
/**
* memory_region_invalidate_mmio_ptr: invalidate the pointer to an mmio
* previously requested.
* In the end that means that if something wants to execute from this area it
* will need to request the pointer again.
*
* @mr: #MemoryRegion associated to the pointer.
* @addr: address within that region
* @size: size of that area.
*/
void memory_region_invalidate_mmio_ptr(MemoryRegion *mr, hwaddr offset,
unsigned size);
/**
* memory_region_dispatch_read: perform a read directly to the specified
* MemoryRegion.