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sel4: convert frame pages back to untyped memory

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to implement _revoke_ram_ds and to fix _unmap_local

Issue #2044
This commit is contained in:
Alexander Boettcher 2016-07-13 13:33:10 +02:00 committed by Christian Helmuth
parent b5ff552460
commit 2aaeb8db1b
4 changed files with 49 additions and 7 deletions
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5
repos/base-sel4/src/core/include/cnode.h
View File

@ -71,7 +71,10 @@ class Genode::Cnode_base
*/ */
void remove(Index idx) void remove(Index idx)
{ {
seL4_CNode_Delete(sel().value(), idx.value(), size_log2()); int ret = seL4_CNode_Delete(sel().value(), idx.value(), size_log2());
if (ret != seL4_NoError)
error(__PRETTY_FUNCTION__, ": seL4_CNode_Delete (",
Hex(idx.value()), ") returned ", ret);
} }
/** /**

42
repos/base-sel4/src/core/include/untyped_memory.h
View File

@ -39,7 +39,7 @@ struct Genode::Untyped_memory
get_page_size_log2()); get_page_size_log2());
if (alloc_ret.error()) { if (alloc_ret.error()) {
PERR("%s: allocation of untyped memory failed", __FUNCTION__); error(__PRETTY_FUNCTION__, ": allocation of untyped memory failed");
throw Phys_alloc_failed(); throw Phys_alloc_failed();
} }
@ -110,13 +110,47 @@ struct Genode::Untyped_memory
node_offset, node_offset,
num_objects); num_objects);
if (ret != 0) { if (ret != seL4_NoError) {
PERR("%s: seL4_Untyped_RetypeAtOffset (IA32_4K) returned %d", error(__FUNCTION__, ": seL4_Untyped_RetypeAtOffset (IA32_4K) "
__FUNCTION__, ret); "returned ", ret);
return; return;
} }
} }
} }
/**
* Free up page frames and turn it so into untyped memory
*/
static inline void convert_to_untyped_frames(addr_t const phys_addr,
addr_t const phys_size)
{
seL4_Untyped const service = Core_cspace::PHYS_CNODE_SEL;
int const space_size = Core_cspace::NUM_PHYS_SEL_LOG2;
for (addr_t phys = phys_addr; phys < phys_addr + phys_size;
phys += get_page_size()) {
int const index = phys >> get_page_size_log2();
/**
* Without the revoke, one gets sporadically
* Untyped Retype: Insufficient memory ( xx bytes needed, x bytes
* available)
* for the phys_addr when it gets reused.
*/
int ret = seL4_CNode_Revoke(service, index, space_size);
if (ret != seL4_NoError)
error(__FUNCTION__, ": seL4_CNode_Revoke returned ", ret);
/**
* Without the delete, one gets:
* Untyped Retype: Slot #xxxx in destination window non-empty
*/
ret = seL4_CNode_Delete(service, index, space_size);
if (ret != seL4_NoError)
error(__FUNCTION__, ": seL4_CNode_Delete returned ", ret);
}
}
}; };
#endif /* _CORE__INCLUDE__UNTYPED_MEMORY_H_ */ #endif /* _CORE__INCLUDE__UNTYPED_MEMORY_H_ */

7
repos/base-sel4/src/core/platform.cc
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@ -75,7 +75,12 @@ bool Mapped_mem_allocator::_map_local(addr_t virt_addr, addr_t phys_addr,
bool Mapped_mem_allocator::_unmap_local(addr_t virt_addr, addr_t phys_addr, bool Mapped_mem_allocator::_unmap_local(addr_t virt_addr, addr_t phys_addr,
unsigned size) unsigned size)
{ {
return unmap_local(virt_addr, size / get_page_size()); if (!unmap_local(virt_addr, size / get_page_size()))
return false;
Untyped_memory::convert_to_untyped_frames(phys_addr, size);
return true;
} }

2
repos/base-sel4/src/core/ram_session_support.cc
View File

@ -32,7 +32,7 @@ void Ram_session_component::_export_ram_ds(Dataspace_component *ds)
void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds) void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds)
{ {
PDBG("not implemented"); Untyped_memory::convert_to_untyped_frames(ds->phys_addr(), ds->size());
} }