mirror of
https://github.com/Mathewnd/Astral.git
synced 2026-10-30 05:58:22 +00:00
Matheus
fa1b35bf18
created an initial stub implementation of the apic driver, added the madt to acpi, fixed an issue with the strncmp, made the pmm set only free pages rather than used ones
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
#include <arch/acpi.h>
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#include <limine.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <arch/panic.h>
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#include <string.h>
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#include <kernel/pmm.h>
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static bool usersdt = false;
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static sdt_t* sdt;
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static size_t sdtentrycount;
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static volatile struct limine_rsdp_request rsdpreq = {
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.id = LIMINE_RSDP_REQUEST,
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.revision = 0
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};
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bool acpi_checksumok(sdt_t* table){
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uint8_t sum;
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uint8_t* ptr = (uint8_t*)table;
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for(size_t i = 0; i < table->length; ++i)
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sum += *ptr++;
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return sum == 0;
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}
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void* acpi_gettable(char* sig, size_t n){
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size_t ptrsize = usersdt ? 4 : 8;
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void* ptr = (char*)sdt + sizeof(sdt_t);
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for(size_t i = 0; i < sdtentrycount; ++i){
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sdt_t* table = usersdt ? (*(uint32_t*)ptr & 0xFFFFFFFF) : *(uint64_t*)ptr;
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table = (uint8_t*)table + (size_t)limine_hhdm_offset;
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if(!strncmp(sig, table->signature, 4)){
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if(n-- == 0)
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return table;
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}
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ptr += ptrsize;
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}
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return NULL;
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}
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void acpi_init(){
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if(!rsdpreq.response){
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// TODO search for ourselves
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_panic("No reponse for the RSDP request", 0);
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}
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rsdp_t* rsdp = rsdpreq.response->address;
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printf("RSDP at: %p\n", rsdp);
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sdt = rsdp->xsdtaddr;
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if(rsdp->revision == 0){
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printf("WARNING: XSDT does not exist in revision 0, falling back to RSDT!\n");
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sdt = rsdp->rsdtaddr;
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usersdt = true;
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}
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sdt = (uint8_t*)sdt + (size_t)limine_hhdm_offset;
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sdtentrycount = (sdt->length - sizeof(sdt_t)) / (usersdt ? 4 : 8);
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printf("Root System Description Table address: %p with %lu tables\n", sdt, sdtentrycount);
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if(!acpi_checksumok(sdt))
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_panic("Invalid RSDT checksum!", 0);
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}
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