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#include "acpi.h"
#include "memops.h"
#include "kprintf.h"
#include "asm_inline.h"
#include <stddef.h>
void* getPointerToOtherSDT(ACPISDTHeader* header)
{
uint8_t* base = (uint8_t*)header;
return &(base[36]);
}
void* getACPITablesPointer(APICHeader* header)
{
uint8_t* base = (uint8_t*)header;
return &(base[44]);
}
#define IS_TABLE(x, header) kmemcmp(x, header->signature, 4*sizeof(uint8_t))
enum ACPI_TABLES getTableType(ACPISDTHeader* header)
{
if(IS_TABLE("APIC", header)) return APIC;
if(IS_TABLE("BGRT", header)) return BGRT;
if(IS_TABLE("BERT", header)) return BERT;
if(IS_TABLE("CPEP", header)) return CPEP;
if(IS_TABLE("DSDT", header)) return DSDT;
if(IS_TABLE("ECDT", header)) return ECDT;
if(IS_TABLE("EINJ", header)) return EINJ;
if(IS_TABLE("ERST", header)) return ERST;
if(IS_TABLE("FACP", header)) return FACP;
if(IS_TABLE("FACS", header)) return FACS;
if(IS_TABLE("HEST", header)) return HEST;
if(IS_TABLE("MSCT", header)) return MSCT;
if(IS_TABLE("MPST", header)) return MPST;
if(IS_TABLE("OEMx", header)) return OEMx;
if(IS_TABLE("PMTT", header)) return PMTT;
if(IS_TABLE("PSDT", header)) return PSDT;
if(IS_TABLE("RASF", header)) return RASF;
if(IS_TABLE("RSDT", header)) return RSDT;
if(IS_TABLE("SBST", header)) return SBST;
if(IS_TABLE("SLIT", header)) return SLIT;
if(IS_TABLE("SRAT", header)) return SRAT;
if(IS_TABLE("SSDT", header)) return SSDT;
if(IS_TABLE("XSDT", header)) return XSDT;
if(IS_TABLE("HPET", header)) return HPET;
return NONE;
}
void* getTable(void* xsdt, enum ACPI_TABLES table)
{
ACPISDTHeader* header = (ACPISDTHeader*)xsdt;
uint64_t* tables = (uint64_t*)getPointerToOtherSDT(xsdt);
uint64_t entries = (header->length - sizeof(ACPISDTHeader)) / 8;
for(int i = 0; i < entries; i++)
{
uint64_t table_ptr = tables[i];
if(getTableType((ACPISDTHeader*)table_ptr) == table)
{
return (ACPISDTHeader*)table_ptr;
}
}
return NULL;
}
void* getAPIC(APICHeader* header, enum APIC_TYPE apic)
{
header->length;
uint8_t* apic_tables = (uint8_t*)getACPITablesPointer(header);
APICEntry* entry = (APICEntry*)apic_tables;
uint8_t offset = 0;
while(offset < (header->length - sizeof(APICHeader)))
{
APICEntry* entry = (APICEntry*)&(apic_tables[offset]);
if(entry->type == apic)
{
return entry;
}
offset += entry->length;
}
return NULL;
}
uint64_t numberTables(APICHeader* header)
{
header->length;
uint8_t* apic_tables = (uint8_t*)getACPITablesPointer(header);
APICEntry* entry = (APICEntry*)apic_tables;
uint8_t offset = 0;
uint64_t tables = 0;
while(offset < (header->length - sizeof(APICHeader)))
{
/*
APICEntry* entry = (APICEntry*)&(apic_tables[offset]);
if(entry->type == apic)
{
return entry;
}
*/
tables++;
offset += entry->length;
}
return tables;
}
void init_acpi(XSDP* xsdp)
{
kprintf("=> Initializing ACPI\n");
uint64_t pic_master = inb(0x21);
uint64_t pic_slave = inb(0xA1);
if((pic_master == 0xFF) && (pic_slave == 0xFF))
{
kprintf("==> PIC disabled\n");
}
if(xsdp != NULL)
{
kprintf("==> ACPI 2.0 Found\n");
}
else
{
kprintf("==X No ACPI 2.0 Found\n");
return;
}
ACPISDTHeader* xsdt = (ACPISDTHeader*)xsdp->xsdtaddress;
APICHeader* apic_table = (APICHeader*)getTable(xsdt, APIC);
if(apic_table == NULL)
{
kprintf("==X Failed To Find APIC Table\n");
return;
}
kprintf("==> Found APIC Table\n");
if(apic_table->flags >= 0)
{
kprintf("==> Dual 8259 PIC Found\n");
}
IOAPICTable* ioapic = getAPIC(apic_table, IOAPIC);
if(ioapic == NULL)
{
kprintf("==X Failed to find a valid IOAPIC\n");
return;
}
uint64_t n_tables = numberTables(apic_table);
kprintf("Number of Tables: %ld\n", n_tables);
kprintf("==> IOAPIC Found\n");
// kprintf("=> ACPI Initialized\n");
}
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