59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
#include <kernel/kernel.h>
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#include <kernel/multiboot.h>
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#include <kernel/mem.h>
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#include <kernel/serial.h>
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#include <kernel/idt.h>
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#include <kernel/pic.h>
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#include <kernel/pit.h>
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kernel_ctx_t ctx = {0};
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struct idt_entry idt[256] = {0};
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struct idtr idtr = {0};
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extern uint32_t isr_stub_table[32];
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extern void pit_isr(void);
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void exception_handler(int_stack_frame_t r) {
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LOG("Exception 0x%X (0x%X) has occurred\nEAX: 0x%08X\nECX: 0x%08X\nEDX: 0x%08X\nEBX: 0x%08X\nESI: 0x%08X\nEDI: 0x%08X\nEBP: 0x%08X\nESP: 0x%08X\n",
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r.int_no, r.err_code, r.eax, r.ecx, r.edx, r.ebx, r.esi, r.edi, r.ebp, r.esp+24);
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LOG("\nEIP: 0x%08X\nCS: 0x%08X\nEFLAGS: 0x%08X\n",
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r.eip, r.cs, r.eflags);
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}
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void sleep(int delay) {
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uint64_t end = ctx.ticks + delay;
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while (ctx.ticks < end)
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cpu_relax;
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}
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void kernel(multiboot_info_t *info) {
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if (!CHECK_FLAG(info->flags, 6)) goto halt; // Memory map
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if (!CHECK_FLAG(info->flags, 12)) goto halt; // VBE data
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ctx.multi_mmap = (multi_mmap_t *)info->memmapaddress;
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ctx.multi_mmap_size = info->memmaplength;
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if (serial_port_init(COM1)) ctx.log_method = LOG_COM1;
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LOG("Kernel log being sent to COM1\n");
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if (!mmap_init()) goto halt;
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LOG("%d bytes of RAM detected\nCreated a %d byte large physical memory map at 0x%08X\n", ctx.mmap_size*BLOCK_SIZE*8, ctx.mmap_size, ctx.mmap);
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for (int i = 0; i < 32; i++) {
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idt_encode_entry(idt, i, isr_stub_table[i], GDT_SEGMENT_SELECTOR(1, 0), TRAP_GATE_32 | INT_RING0 | INT_PRESENT);
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}
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idt_encode_entry(idt, 32, (uint32_t)pit_isr, GDT_SEGMENT_SELECTOR(1, 0), TRAP_GATE_32 | INT_RING0 | INT_PRESENT);
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idtr.size = (sizeof(struct idt_entry) * 256) - 1;
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idtr.base = (uint32_t) idt;
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asm volatile ("lidt %0" :: "m"(idtr));
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pic_remap(PIC_1_START, PIC_2_START);
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asm volatile ("sti" ::);
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ctx.ticks = 0;
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pit_init();
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halt:
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for (;;) {}
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}
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