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pc/platform: allow booting with enabled IOMMU

Browse Source 
genodelabs/genode#5002
This commit is contained in:
Johannes Schlatow 2023-11-27 22:31:59 +01:00
parent 1f1437747c
commit 039ade7ad0
2 changed files with 20 additions and 12 deletions
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29
repos/pc/src/drivers/platform/pc/intel/io_mmu.cc
View File

@ -134,7 +134,6 @@ void Intel::Io_mmu::flush_write_buffer()
*/
void Intel::Io_mmu::invalidate_iotlb(Domain_id domain_id, addr_t, size_t)
{
unsigned requested_scope = Context_command::Cirg::GLOBAL;
if (domain_id.valid())
requested_scope = Context_command::Cirg::DOMAIN;
@ -376,26 +375,29 @@ void Intel::Io_mmu::add_default_range(Range const & range, addr_t paddr)
void Intel::Io_mmu::default_mappings_complete()
{
/* skip if already enabled */
if (read<Global_status::Enabled>())
return;
Root_table_address::access_t rtp =
Root_table_address::Address::masked(_managed_root_table.phys_addr());
/* caches must be cleared if Esrtps is not set (see 6.6) */
if (!read<Capability::Esrtps>())
invalidate_all();
/* skip if already set */
if (read<Root_table_address>() == rtp)
return;
/* insert contexts into managed root table */
_default_mappings.copy_stage2(_managed_root_table);
/* set root table address */
write<Root_table_address>(
Root_table_address::Address::masked(_managed_root_table.phys_addr()));
write<Root_table_address>(rtp);
/* issue set root table pointer command */
_global_command<Global_command::Srtp>(1);
/* caches must be cleared if Esrtps is not set (see 6.6) */
if (!read<Capability::Esrtps>())
invalidate_all();
/* enable IOMMU */
_global_command<Global_command::Enable>(1);
if (!read<Global_status::Enabled>())
_global_command<Global_command::Enable>(1);
log("enabled IOMMU ", name(), " with default mappings");
}
@ -426,8 +428,11 @@ Intel::Io_mmu::Io_mmu(Env & env,
}
if (read<Global_status::Enabled>()) {
error("IOMMU already enabled");
return;
log("IOMMU has been enabled during boot");
/* disable queued invalidation interface */
if (read<Global_status::Qies>())
_global_command<Global_command::Qie>(false);
}
/* enable fault event interrupts */

3
repos/pc/src/drivers/platform/pc/intel/io_mmu.h
View File

@ -251,6 +251,9 @@ class Intel::Io_mmu : private Attached_mmio,
/* write-buffer flush */
struct Wbf : Bitfield<27,1> { };
/* queued invalidation enable */
struct Qie : Bitfield<26,1> { };
/* set interrupt remap table pointer */
struct Sirtp : Bitfield<24,1> { };
};