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Fixed up ACPI Version 1.0 checksum validation code

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Nigel Barink
2023-02-27 00:32:16 +01:00
parent e6901f0526
commit 2d0bb16fad
5 changed files with 53 additions and 34 deletions
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34
kernel/acpi/acpi.cpp
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@ -1,5 +1,6 @@
#include "acpi.h"
RSDPDescriptor* ACPI::rsd_ptr;
RSCPDescriptor20* ACPI::rsd2_ptr;
RSDT* ACPI::rsd_table;
@ -8,19 +9,34 @@ void ACPI::initialize(){
// Find the Root System Description Pointer
ACPI::rsd_ptr = FindRSD();
printf("RSD address: 0x%x\n", ACPI::rsd_ptr);
//printRSD(rsd_ptr);
// is it valid
int sum = 0;
for (int i =0; i < 20 ; i++) {
sum += ((char*)rsd_ptr)[i];
if( rsd_ptr->Revision == 0 ){
// Using veriosn 1.0 of the ACPI specifiction
int sum = rsd_ptr->Checksum;
for (int i =0; i < sizeof(RSDPDescriptor) ; i++) {
sum += ((char*)rsd_ptr)[i];
}
printf(" 0x%x sum\n", sum);
if(sum & 0xfff0)
printf("valid rsd!\n");
else
printf("invalid rsd\n");
// Get the Root System Description Table NOTE: might need memory mapping
//RSDT* rootSystemDescriptionTable = (RSDT*) (rsd_ptr->RsdtAddress + 0xC0000000);
} else{
// parse it as of version2.0
ACPI::rsd2_ptr = (RSCPDescriptor20*)rsd_ptr;
}
printf(" 0x%x sum\n", sum);
return;
// Get the Root System Description Table
RSDT* rootSystemDescriptionTable = getRSDT((RSDPDescriptor *) rsd_ptr);
/*
auto tableHeader = &rootSystemDescriptionTable->h;
// do checksum
@ -31,5 +47,5 @@ void ACPI::initialize(){
}
if( sum != 0)
printf("Table invalid!");
printf("Table invalid!");*/
}