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Search for SMBIOS & RSDP if the bootloader doesn't provide them

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This commit is contained in:
Alex 2023-09-07 02:58:20 +03:00
parent a452b9acd1
commit fcf1e7528e
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
3 changed files with 105 additions and 56 deletions
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12
Core/Memory/ReserveEssentials.cpp
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@ -162,19 +162,11 @@ namespace Memory
debug("Reserving RSDT...");
this->ReservePages((void *)bInfo.RSDP, TO_PAGES(sizeof(BootInfo::RSDPInfo)));
#if defined(a64)
if ((uintptr_t)ACPIPtr > 0x7FE00000) /* FIXME */
if (!Memory::Virtual().Check(ACPIPtr))
{
error("ACPI table is located above 0x7FE00000, which is not mapped.");
error("ACPI table is located in an unmapped region.");
return;
}
#elif defined(a32)
if ((uintptr_t)ACPIPtr > 0x2800000) /* FIXME */
{
error("ACPI table is located above 0x2800000, which is not mapped.");
return;
}
#endif
size_t TableSize = ((ACPIPtr->Length - sizeof(ACPI::ACPI::ACPIHeader)) /
(XSDT ? 8 : 4));

1
Core/SystemManagementBIOS.cpp
View File

@ -30,6 +30,7 @@ namespace SMBIOS
debug("SMBIOS is available (%#lx).", bInfo.SMBIOSPtr);
return true;
}
debug("SMBIOS is not available. (%#lx)", bInfo.SMBIOSPtr);
return false;
}

56
Kernel.cpp
View File

@ -155,6 +155,10 @@ bool DebuggerIsAttached = false;
* - SMBIOS:
* https://www.dmtf.org/dsp/DSP0134
* https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
* https://wiki.osdev.org/System_Management_BIOS
*
* - EDBA:
* https://wiki.osdev.org/Memory_Map_(x86)
*
* - UMIP, SMAP and SMEP:
* https://en.wikipedia.org/wiki/Control_register
@ -599,6 +603,58 @@ EXTERNC __no_stack_protector NIF void Entry(BootInfo *Info)
for (CallPtr *func = __init_array_start; func != __init_array_end; func++)
(*func)();
#ifdef a86
if (!bInfo.SMBIOSPtr)
{
trace("SMBIOS was not provided by the bootloader. Trying to find it manually.");
for (uintptr_t i = 0xF0000; i < 0x100000; i += 16)
{
if (memcmp((void *)i, "_SM_", 4) == 0 || memcmp((void *)i, "_SM3_", 5) == 0)
{
bInfo.SMBIOSPtr = (void *)i;
trace("Found SMBIOS at %#lx", i);
}
}
}
if (!bInfo.RSDP)
{
trace("RSDP was not provided by the bootloader. Trying to find it manually.");
/* FIXME: Not always shifting by 4 will work. */
uintptr_t EBDABase = (uintptr_t)mminw((void *)0x40E) << 4;
for (uintptr_t ptr = EBDABase;
ptr < 0x100000; /* 1MB */
ptr += 16)
{
if (unlikely(ptr == EBDABase + 0x400))
{
trace("EBDA is full. Trying to find RSDP in the BIOS area.");
break;
}
BootInfo::RSDPInfo *rsdp = (BootInfo::RSDPInfo *)ptr;
if (memcmp(rsdp->Signature, "RSD PTR ", 8) == 0)
{
bInfo.RSDP = (BootInfo::RSDPInfo *)rsdp;
trace("Found RSDP at %#lx", rsdp);
}
}
for (uintptr_t ptr = 0xE0000;
ptr < 0x100000; /* 1MB */
ptr += 16)
{
BootInfo::RSDPInfo *rsdp = (BootInfo::RSDPInfo *)ptr;
if (memcmp(rsdp->Signature, "RSD PTR ", 8) == 0)
{
bInfo.RSDP = (BootInfo::RSDPInfo *)rsdp;
trace("Found RSDP at %#lx", rsdp);
}
}
}
#endif
InitializeMemoryManagement();
void *KernelStackAddress = KernelAllocator.RequestPages(TO_PAGES(STACK_SIZE));