#16712: Failure to boot with wrong reporting too much RAM
---------------------------------+-------------------------
Reporter: eu | Owner: nobody
Type: bug | Status: assigned
Priority: normal | Milestone: Unscheduled
Component: System/Boot Loader | Version: R1/beta2
Resolution: | Keywords:
Blocked By: | Blocking: 17586
Platform: x86-64 |
---------------------------------+-------------------------
Comment (by korli):
I checked what would be mapped for such a processor, for instance, https
://linux-hardware.org/?probe=64299c7b4a&log=dmesg
{{{
0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x0000000009e01fff]
usable
[ 0.000000] BIOS-e820: [mem 0x0000000009e02000-0x0000000009ffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x000000000a000000-0x000000000a1fffff]
usable
[ 0.000000] BIOS-e820: [mem 0x000000000a200000-0x000000000a20ffff] ACPI
NVS
[ 0.000000] BIOS-e820: [mem 0x000000000a210000-0x000000000affffff]
usable
[ 0.000000] BIOS-e820: [mem 0x000000000b000000-0x000000000b020fff]
reserved
[ 0.000000] BIOS-e820: [mem 0x000000000b021000-0x00000000a05bafff]
usable
[ 0.000000] BIOS-e820: [mem 0x00000000a05bb000-0x00000000a65bafff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000a65bb000-0x00000000a666afff] ACPI
data
[ 0.000000] BIOS-e820: [mem 0x00000000a666b000-0x00000000a866afff] ACPI
NVS
[ 0.000000] BIOS-e820: [mem 0x00000000a866b000-0x00000000a9ffdfff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000a9ffe000-0x00000000a9ffefff]
usable
[ 0.000000] BIOS-e820: [mem 0x00000000a9fff000-0x00000000a9ffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000aa000000-0x00000000abffcfff]
usable
[ 0.000000] BIOS-e820: [mem 0x00000000abffd000-0x00000000acffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ad7f5000-0x00000000afffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fd000000-0x00000000ffffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x0000000747ffffff]
usable
[ 0.000000] BIOS-e820: [mem 0x0000000748000000-0x0000000847ffffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x000000084eec0000-0x00000008701fffff]
reserved
[ 0.000000] BIOS-e820: [mem 0x000000fd00000000-0x000000ffffffffff]
reserved
}}}
This means, the top reserved ranges should be ignored. At https://cgit
.haiku-
os.org/haiku/tree/src/system/boot/platform/efi/arch/x86_64/arch_mmu.cpp#n226
{{{
for (size_t i = 0; i < memory_map_size / descriptor_size; ++i) {
efi_memory_descriptor *entry
= (efi_memory_descriptor *)((addr_t)memory_map + i
* descriptor_size);
switch (entry->Type) {
case EfiLoaderCode:
case EfiLoaderData:
case EfiBootServicesCode:
case EfiBootServicesData:
case EfiConventionalMemory:
case EfiRuntimeServicesCode:
case EfiRuntimeServicesData:
case EfiPersistentMemory:
case EfiACPIReclaimMemory:
case EfiACPIMemoryNVS:
maxAddress = std::max(maxAddress,
entry->PhysicalStart +
entry->NumberOfPages * 4096);
break;
}
default:
break;
}
}}}
I'll submit a patch, or you can try yourself.
--
Ticket URL: <https://dev.haiku-os.org/ticket/16712#comment:54>
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