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ACPI reading memory when mapped to higher half

dev
Nigel Barink 2023-09-11 23:23:38 +02:00
parent e8df6ec628
commit 2970806705
3 changed files with 46 additions and 11 deletions
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37
kernel/acpi/acpi.cpp
View File

@ -1,20 +1,22 @@
#include "acpi.h"
#include "../../CoreLib/Memory.h"
#include "../memory/VirtualMemoryManager.h"
RSDPDescriptor* ACPI::rsd_ptr;
RSCPDescriptor20* ACPI::rsd2_ptr;
RSDT* ACPI::rsd_table;
const int KERNEL_OFFSET = 0xC0000000;
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);
printRSD(rsd_ptr);
if( rsd_ptr->Revision == 0 ){
// Using veriosn 1.0 of the ACPI specifiction
// Using version 1.0 of the ACPI specification
int sum = rsd_ptr->Checksum;
for (int i =0; i < sizeof(RSDPDescriptor) ; i++) {
sum += ((char*)rsd_ptr)[i];
@ -26,11 +28,34 @@ void ACPI::initialize(){
else
printf("invalid rsd\n");
printf("rsdp: 0x%x\n", rsd_ptr);
printf("0x%x address\n", (rsd_ptr->RsdtAddress));
Immediate_Map(rsd_ptr->RsdtAddress + KERNEL_OFFSET, rsd_ptr->RsdtAddress);
RSDT* rootSystemDescriptionTable = (RSDT*)(rsd_ptr->RsdtAddress + KERNEL_OFFSET);
//printf("0x%x Root System Descriptor address\n", rootSystemDescriptionTable);
// checksum it, but we'll ignore it for now
printf("signature ");
for (int i = 0; i < 4; i++) {
kterm_put( rootSystemDescriptionTable->h.Signature[i]);
}
kterm_put('\n');
int entries = (rootSystemDescriptionTable->h.Length - sizeof (rootSystemDescriptionTable->h)) /4;
printf("%d num entries\n", entries);
for( int i = 0; i < entries; i++){
ACPISDTHeader* h = (ACPISDTHeader*) rootSystemDescriptionTable->PointerToSDT + i ;
if(strncmp(h->Signature, "FACP", 4)){
printf("Found FACP Entry!\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
printf("rsd2_ptr\n");
ACPI::rsd2_ptr = (RSCPDescriptor20*)rsd_ptr;
}

15
kernel/acpi/rsdp.cpp
View File

@ -23,11 +23,22 @@ RSDPDescriptor* FindRSD(){
char* memory_byte = (char*) 0x000f2e14;
const void* string = "RSD PTR ";
for( ; (uint32_t) memory_byte < 0x00100000; memory_byte+=10){
for( ; (uint32_t) memory_byte < 0x0100000; memory_byte+=10){
if( memcmp(memory_byte , string , 8 ) == 0 ) {
printf("RSD PTR found at 0x%x !\n", memory_byte);
return (RSDPDescriptor*) memory_byte;
break;
}
}
return (RSDPDescriptor*) memory_byte;
memory_byte = (char*) 0x000E0000;
for ( ;(uint32_t) memory_byte < 0x000FFFFF; memory_byte += 1)
{
if( memcmp(memory_byte , string , 8 ) == 0 ) {
printf("RSD PTR found at 0x%x !\n", memory_byte);
return (RSDPDescriptor*) memory_byte;
break;
}
}
}

5
kernel/acpi/rsdp.h
View File

@ -16,10 +16,9 @@ struct ACPISDTHeader{
uint32_t CreatorRevision;
};
struct RSDT{
struct ACPISDTHeader h;
uint32_t PointerToSDT[]; // Length of array : (header.Length - sizeof(header))/ 4
uint32_t *PointerToSDT; // Length of array : (header.Length - sizeof(header))/ 4
}__attribute__((packed));
@ -28,7 +27,7 @@ struct RSDPDescriptor {
uint8_t Checksum ;
char OEMID [6];
uint8_t Revision;
RSDT* RsdtAddress;
uint32_t RsdtAddress;
}__attribute__((packed));
struct RSCPDescriptor20{