eliott/serenity
1
0
Fork 0
mirror of https://github.com/SerenityOS/serenity synced 2026-05-11 17:37:00 +02:00
Code Issues Packages Projects Releases Wiki Activity

Kernel/Memory: Ignore reserved range at 0x000003ff f000 0000

Browse Source 
On Meteor Lake this range covers the GFX address space reservations,
at a very high address. Nothing actually ends up using it, so we can
ignore it. Moreover if we don't we end up with highest_address at the
4 TiB mark which would need an enormous page table to map this
huge (0-4TiB) range. Until we support mapping I/O space piecewise we
need to skip this range.
This commit is contained in:
Vladimir Serbinenko
2025-02-24 01:00:54 +03:00
committed by Sönke Holz
parent 679343e3b3
commit bc06c9efa4
1 changed files with 18 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
Kernel/Memory/MemoryManager.cpp
View File

@@ -457,7 +457,15 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map_efi(MemoryManager::GlobalD
// done *and* there's >= 40 phys bit that would put max phyusical boundary to 1T
// This should allow virtual firmware to avoid the reserved range at the
// 1T boundary on VFs with big bars."
if (start_paddr.get() != 0x000000fd00000000 || length != (0x000000ffffffffff - 0x000000fd00000000) + 1)
//
// On Meteor Lake systems, coreboot marks the address range used by the P2SB device
// (0x3fff0000000-0x3ffffffffff) as reserved. Nothing actually ends up using it,
// so we can ignore it.
// Moreover if we don't we end up with highest_address at 4 TiB mark which
// would need an enormous metadata storage for this huge (0-4TiB) range.
// Until we support discontinous regions better we need to skip this range.
if ((start_paddr.get() != 0x000000fd00000000 || length != (0x000000ffffffffff - 0x000000fd00000000) + 1)
&& (start_paddr.get() != 0x000003fff0000000 || length != 0x10000000))
#endif
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::Reserved, start_paddr, length });
break;
@@ -718,7 +726,15 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map_multiboot(MemoryManager::G
// done *and* there's >= 40 phys bit that would put max phyusical boundary to 1T
// This should allow virtual firmware to avoid the reserved range at the
// 1T boundary on VFs with big bars."
if (address != 0x000000fd00000000 || length != (0x000000ffffffffff - 0x000000fd00000000) + 1)
//
// On Meteor Lake systems, coreboot marks the address range used by the P2SB device
// (0x3fff0000000-0x3ffffffffff) as reserved. Nothing actually ends up using it,
// so we can ignore it.
// Moreover if we don't we end up with highest_address at 4 TiB mark which
// would need an enormous metadata storage for this huge (0-4TiB) range.
// Until we support discontinous regions better we need to skip this range.
if ((address != 0x000000fd00000000 || length != (0x000000ffffffffff - 0x000000fd00000000) + 1)
&& (address != 0x000003fff0000000 || length != 0x10000000))
#endif
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::Reserved, start_address, length });
break;