106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
#include <multiboot.h>
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#include <acpi.h>
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#include <vga.h>
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#include <pci.h>
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#include <printf.h>
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#include <strcmp.h>
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#include <gdt.h>
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#include <idt.h>
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#include <pic8259.h>
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#include <ps2.h>
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struct kernel_context {
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struct rsdp *rsdp;
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struct xsdp *xsdp;
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struct rsdt *rsdt;
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};
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struct kernel_context ctx = {0};
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struct idt_entry g_idt[256] = {0};
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struct idtr g_idtr = {0};
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extern void exception_handler();
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extern void ps2_isr();
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#define MAGIC_BREAKPOINT __asm__ volatile("xchgw %bx, %bx");
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void kmain(struct multiboot_info *info) {
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clear_screen();
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// Check if the bootloader gave us the upper and lower memory
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if (!(info->flags & 0x1)) goto halt;
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// Create and load an IDT
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for (int i = 0; i < 32; i++) {
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encode_idt_entry(g_idt, i, (uint32_t)&exception_handler, GDT_SEGMENT_SELECTOR(GDT_KERNEL_CODE, 0x00), TRAP_GATE_32 | INT_RING0 | INT_PRESENT);
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}
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g_idtr.size = (sizeof(struct idt_entry) * 256) - 1;
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g_idtr.base = (uint32_t) &g_idt;
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asm volatile ("lidt %0" :: "m"(g_idtr));
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struct rsdp *found_rsdp = acpi_locate_rsdp();
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if (!found_rsdp) {
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printf("Failed to find RSDP signature\n");
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goto halt;
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}
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printf("RSDP detected at 0x%X\n", found_rsdp);
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if (found_rsdp->Revision == ACPI_VER_1) {
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if (!acpi_validate_rsdp_checksum(found_rsdp)) {
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printf("RSDP has an invalid checksum\n");
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goto halt;
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}
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ctx.rsdp = found_rsdp;
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ctx.xsdp = 0;
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if (!acpi_validate_sdt_checksum((struct ACPISDTHeader *)found_rsdp->RsdtAddress)) {
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printf("RSDT has an invalid checksum\n");
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goto halt;
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}
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ctx.rsdt = (struct rsdt*)found_rsdp->RsdtAddress;
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printf("RSDT detected at 0x%X\n", found_rsdp->RsdtAddress);
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} else if (found_rsdp->Revision == ACPI_VER_OTHER) {
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printf("ACPI versions higher than 1.0 are not supported\n");
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goto halt;
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} else {
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printf("Invalid RSDP\n");
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goto halt;
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}
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printf("Using ACPI v1.0\n");
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struct fadt *fadt = acpi_locate_sdt(ctx.rsdt, "FACP");
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if (!fadt) {
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printf("Failed to find FADT\n");
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goto halt;
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}
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printf("Found FADT at 0x%x\n", fadt);
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if (fadt->Flags & 1)
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printf("Legacy devices are supported.\n");
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pic_remap(PIC_1_START, PIC_2_START);
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// ACPI version 1.0 is so old that we assume that our PC supports the 8042 ps/2 controller
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initialize_8042ps2();
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encode_idt_entry(g_idt, 0x21, (uint32_t)&ps2_isr, GDT_SEGMENT_SELECTOR(GDT_KERNEL_CODE, 0x00), INT_GATE_32 | INT_RING0 | INT_PRESENT);
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asm volatile ("sti" ::);
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struct mcfg *mcfg = acpi_locate_sdt(ctx.rsdt, "MCFG");
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if (!mcfg) {
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printf("failed to find mcfg\n");
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} else {
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printf("Found MCFG at 0x%x\n", mcfg);
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struct pci_config_space *ide = pcie_find_device(mcfg, MASS_STORAGE_CONTROLLER, IDE_INTERFACE);
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if (ide) printf("IDE controller detected. Program Interface: %X\n", ide->program_interface);
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}
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halt:
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for (;;) {}
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}
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