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Espresso 0.0.1b

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This commit is contained in:
David Goeke
2025-06-27 14:48:06 -05:00
parent fca025a9bf
commit c336584114
39 changed files with 2676 additions and 936 deletions
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38
drivers/idt.c
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@ -53,7 +53,7 @@ void exception_dispatcher(uint32_t int_no, uint32_t err_code)
case 14:
{
uint32_t cr2;
__asm__ volatile ("mov %%cr2, %0" : "=r"(cr2));
asm volatile ("mov %%cr2, %0" : "=r"(cr2));
printf("Page Fault at address: 0x%x, err=0x%x\n", cr2, err_code);
break;
}
@ -70,7 +70,13 @@ void exception_dispatcher(uint32_t int_no, uint32_t err_code)
printf("CS=0x%04x DS=0x%04x ES=0x%04x SS=0x%04x\n", cs, ds, es, ss);
__asm__ volatile ("cli; hlt");
asm volatile ("cli; hlt");
/* Will never be reached */
while (true)
{
asm volatile ("hlt" ::: "memory");
}
}
@ -89,29 +95,29 @@ void pic_remap(void)
{
uint8_t a1, a2;
// Save masks
/* Save masks */
a1 = inb(PIC1_DATA);
a2 = inb(PIC2_DATA);
// Start initialization sequence (in cascade mode)
/* Start initialization sequence (in cascade mode) */
outb(PIC1_COMMAND, 0x11);
outb(PIC2_COMMAND, 0x11);
// Set vector offset
outb(PIC1_DATA, 0x20); // IRQs 0-7 mapped to IDT entries 0x20-0x27 (32–39)
outb(PIC2_DATA, 0x28); // IRQs 8-15 mapped to IDT entries 0x28-0x2F (40–47)
/* Set vector offset */
outb(PIC1_DATA, 0x20); /* IRQs 0-7 mapped to IDT entries 0x20-0x27 (32–39) */
outb(PIC2_DATA, 0x28); /* IRQs 8-15 mapped to IDT entries 0x28-0x2F (40–47) */
// Tell Master PIC about Slave PIC at IRQ2 (0000 0100)
/* Tell Master PIC about Slave PIC at IRQ2 (0000 0100) */
outb(PIC1_DATA, 0x04);
// Tell Slave PIC its cascade identity (0000 0010)
/* Tell Slave PIC its cascade identity (0000 0010) */
outb(PIC2_DATA, 0x02);
// Set 8086/88 mode
/* Set 8086/88 mode */
outb(PIC1_DATA, 0x01);
outb(PIC2_DATA, 0x01);
// Restore saved masks
/* Restore saved masks */
outb(PIC1_DATA, a1);
outb(PIC2_DATA, a2);
}
@ -123,19 +129,19 @@ void idt_init(void)
for (uint8_t vector = 0; vector < 32; vector++)
{
idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
vectors[vector] = true;
idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
vectors[vector] = true;
}
extern void* irq_stub_table[];
for (uint8_t i = 0; i < 16; i++)
{
idt_set_descriptor(32 + i, irq_stub_table[i], 0x8E);
idt_set_descriptor(32 + i, irq_stub_table[i], 0x8E);
}
__asm__ volatile ("lidt %0" : : "m"(idtr)); /* load the new IDT */
__asm__ volatile ("sti"); /* set the interrupt flag */
asm volatile ("lidt %0" : : "m"(idtr)); /* load the new IDT */
asm volatile ("sti"); /* set the interrupt flag */
}