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-rw-r--r--kernel/cpu/cpu.c3
-rw-r--r--kernel/cpu/fpu.c9
-rw-r--r--kernel/cpu/idt.c109
-rw-r--r--kernel/cpu/idt.h26
-rw-r--r--kernel/cpu/pic.c70
-rw-r--r--kernel/io/io.c11
-rw-r--r--kernel/io/panic.c4
-rw-r--r--kernel/mboot/mboot.c6
-rw-r--r--kernel/mboot/mboot.h15
-rw-r--r--kernel/mboot/mmap.c31
10 files changed, 147 insertions, 137 deletions
diff --git a/kernel/cpu/cpu.c b/kernel/cpu/cpu.c
index 8f37402..a77baac 100644
--- a/kernel/cpu/cpu.c
+++ b/kernel/cpu/cpu.c
@@ -3,7 +3,8 @@
#include "pic.h"
#include "idt.h"
-void cpu_init(void) {
+void cpu_init(void)
+{
pic_remap();
idt_init();
fpu_init();
diff --git a/kernel/cpu/fpu.c b/kernel/cpu/fpu.c
index f2674a7..cafe6e5 100644
--- a/kernel/cpu/fpu.c
+++ b/kernel/cpu/fpu.c
@@ -2,11 +2,12 @@
#include "fpu.h"
-void fpu_init(void) {
+void fpu_init(void)
+{
size_t cr4;
uint16_t cw = 0x37F;
- __asm__ volatile ("mov %%cr4, %0" : "=r"(cr4));
+ __asm__ volatile("mov %%cr4, %0" : "=r"(cr4));
cr4 |= 0x200;
- __asm__ volatile ("mov %0, %%cr4" :: "r"(cr4));
- __asm__ volatile("fldcw %0" :: "m"(cw));
+ __asm__ volatile("mov %0, %%cr4" ::"r"(cr4));
+ __asm__ volatile("fldcw %0" ::"m"(cw));
}
diff --git a/kernel/cpu/idt.c b/kernel/cpu/idt.c
index af12fff..3bdbe8d 100644
--- a/kernel/cpu/idt.c
+++ b/kernel/cpu/idt.c
@@ -9,12 +9,12 @@
#define IDT_SIZE 256
struct idt_entry {
- uint16_t isr_low; // low 16 bits of isr
- uint16_t kernel_cs; // kernel segment selector
- uint8_t ist; // interrupt stack table
- uint8_t flags; // gate type, privilege level, present bit
- uint16_t isr_mid; // middle 16 bits of isr
- uint32_t isr_high; // high 32 bits of isr
+ uint16_t isr_low; // low 16 bits of isr
+ uint16_t kernel_cs; // kernel segment selector
+ uint8_t ist; // interrupt stack table
+ uint8_t flags; // gate type, privilege level, present bit
+ uint16_t isr_mid; // middle 16 bits of isr
+ uint32_t isr_high; // high 32 bits of isr
uint32_t reserved;
} __attribute__((packed));
@@ -24,7 +24,7 @@ struct idtr {
} __attribute__((packed));
// interrupt gate
-#define GATE_64BIT_INT 0x0E
+#define GATE_64BIT_INT 0x0E
// trap gate
#define GATE_64BIT_TRAP 0x0F
@@ -37,15 +37,15 @@ struct idtr {
// interrupt is present in IDT
#define PRESENT 0x80
-__attribute__((aligned(0x10)))
-static struct idt_entry idt[256];
+__attribute__((aligned(0x10))) static struct idt_entry idt[256];
static struct idtr idtr;
// from idt.S
extern void *isr_stub_table[];
// initialize and load the IDT
-void idt_init(void) {
+void idt_init(void)
+{
// initialize idtr
idtr.address = (uint64_t)&idt;
idtr.size = (uint16_t)sizeof(struct idt_entry) * IDT_SIZE - 1;
@@ -67,10 +67,11 @@ void idt_init(void) {
entry->reserved = 0;
}
- __asm__ volatile ("lidt %0" : : "m"(idtr));
+ __asm__ volatile("lidt %0" : : "m"(idtr));
}
-static void isr_print_regs(struct isr_regs *regs) {
+static void isr_print_regs(struct isr_regs *regs)
+{
printf("rax: %#016lx (%lu)\n", regs->rax, regs->rax);
printf("rbx: %#016lx (%lu)\n", regs->rbx, regs->rbx);
printf("rcx: %#016lx (%lu)\n", regs->rcx, regs->rcx);
@@ -79,8 +80,8 @@ static void isr_print_regs(struct isr_regs *regs) {
printf("rdi: %#016lx (%lu)\n", regs->rdi, regs->rdi);
printf("rsp: %#016lx (%lu)\n", regs->rsp, regs->rsp);
printf("rbp: %#016lx (%lu)\n", regs->rbp, regs->rbp);
- printf("r8 : %#016lx (%lu)\n", regs->r8 , regs->r8 );
- printf("r9 : %#016lx (%lu)\n", regs->r9 , regs->r9 );
+ printf("r8 : %#016lx (%lu)\n", regs->r8, regs->r8);
+ printf("r9 : %#016lx (%lu)\n", regs->r9, regs->r9);
printf("r10: %#016lx (%lu)\n", regs->r10, regs->r10);
printf("r11: %#016lx (%lu)\n", regs->r11, regs->r11);
printf("r12: %#016lx (%lu)\n", regs->r12, regs->r12);
@@ -91,30 +92,48 @@ static void isr_print_regs(struct isr_regs *regs) {
printf("rflags: %#016lx (%lu)\n", regs->rflags, regs->rflags);
struct rflags *rflags = (struct rflags *)regs->rflags;
puts("rflags: ");
- if (rflags->cf) puts("CF ");
- if (rflags->pf) puts("PF ");
- if (rflags->af) puts("AF ");
- if (rflags->zf) puts("ZF ");
- if (rflags->sf) puts("SF ");
- if (rflags->tf) puts("TF ");
- if (rflags->if_) puts("IF ");
- if (rflags->df) puts("DF ");
- if (rflags->of) puts("OF ");
- if (rflags->iopl) puts("IOPL ");
- if (rflags->nt) puts("NT ");
- if (rflags->md) puts("MD ");
- if (rflags->rf) puts("RF ");
- if (rflags->vm) puts("VM ");
- if (rflags->ac) puts("AC ");
- if (rflags->vif) puts("VIF ");
- if (rflags->vip) puts("VIP ");
- if (rflags->id) puts("ID ");
+ if (rflags->cf)
+ puts("CF ");
+ if (rflags->pf)
+ puts("PF ");
+ if (rflags->af)
+ puts("AF ");
+ if (rflags->zf)
+ puts("ZF ");
+ if (rflags->sf)
+ puts("SF ");
+ if (rflags->tf)
+ puts("TF ");
+ if (rflags->if_)
+ puts("IF ");
+ if (rflags->df)
+ puts("DF ");
+ if (rflags->of)
+ puts("OF ");
+ if (rflags->iopl)
+ puts("IOPL ");
+ if (rflags->nt)
+ puts("NT ");
+ if (rflags->md)
+ puts("MD ");
+ if (rflags->rf)
+ puts("RF ");
+ if (rflags->vm)
+ puts("VM ");
+ if (rflags->ac)
+ puts("AC ");
+ if (rflags->vif)
+ puts("VIF ");
+ if (rflags->vip)
+ puts("VIP ");
+ if (rflags->id)
+ puts("ID ");
puts("\n");
}
-#define EX_DEBUG 0x01
-#define EX_BREAKPOINT 0x03
-#define EX_PAGE_FAULT 0x0e
+#define EX_DEBUG 0x01
+#define EX_BREAKPOINT 0x03
+#define EX_PAGE_FAULT 0x0e
// Intel manual vol 3 ch 6.3.1
char *EXCEPTIONS[] = {
@@ -152,13 +171,15 @@ char *EXCEPTIONS[] = {
"Reserved",
};
-void idt_exception_handler(uint64_t exception, uint64_t code, struct isr_regs *state) {
+void idt_exception_handler(uint64_t exception, uint64_t code,
+ struct isr_regs *state)
+{
uint64_t cr2;
switch (exception) {
case EX_PAGE_FAULT:
// page faults store the offending address in cr2
- __asm__ volatile ("mov %%cr2, %0" : "=r"(cr2));
+ __asm__ volatile("mov %%cr2, %0" : "=r"(cr2));
if (!load_page((void *)cr2))
return;
}
@@ -182,13 +203,15 @@ void idt_exception_handler(uint64_t exception, uint64_t code, struct isr_regs *s
}
}
-void idt_pic_eoi(uint8_t exception) {
+void idt_pic_eoi(uint8_t exception)
+{
pic_eoi(exception - PIC_REMAP_OFFSET);
}
int counter = 0;
-void idt_pic_timer(void) {
+void idt_pic_timer(void)
+{
// print a message once we know the timer works
// but avoid spamming the logs
if (counter == 3) {
@@ -199,6 +222,10 @@ void idt_pic_timer(void) {
}
}
-void idt_pic_keyboard(void) {}
+void idt_pic_keyboard(void)
+{
+}
-void idt_pic_mouse(void) {}
+void idt_pic_mouse(void)
+{
+}
diff --git a/kernel/cpu/idt.h b/kernel/cpu/idt.h
index 46ef4a3..7f1d9e6 100644
--- a/kernel/cpu/idt.h
+++ b/kernel/cpu/idt.h
@@ -36,33 +36,13 @@ struct isr_regs {
};
struct rflags {
- uint64_t cf : 1,
- : 1,
- pf : 1,
- : 1,
- af : 1,
- : 1,
- zf : 1,
- sf : 1,
+ uint64_t cf : 1, : 1, pf : 1, : 1, af : 1, : 1, zf : 1, sf : 1,
- tf : 1,
- if_ : 1,
- df : 1,
- of : 1,
- iopl : 2,
- nt : 1,
- md : 1,
+ tf : 1, if_ : 1, df : 1, of : 1, iopl : 2, nt : 1, md : 1,
- rf : 1,
- vm : 1,
- ac : 1,
- vif : 1,
- vip : 1,
- id : 1,
- : 42;
+ rf : 1, vm : 1, ac : 1, vif : 1, vip : 1, id : 1, : 42;
};
void idt_init(void);
#endif /* idt.h */
-
diff --git a/kernel/cpu/pic.c b/kernel/cpu/pic.c
index 7065a03..c5c41cc 100644
--- a/kernel/cpu/pic.c
+++ b/kernel/cpu/pic.c
@@ -2,56 +2,63 @@
#include "pic.h"
-#define PIC1 0x20 /* IO base address for master PIC */
-#define PIC2 0xA0 /* IO base address for slave PIC */
-#define PIC1_COMMAND PIC1
-#define PIC1_DATA (PIC1+1)
-#define PIC2_COMMAND PIC2
-#define PIC2_DATA (PIC2+1)
+#define PIC1 0x20 /* IO base address for master PIC */
+#define PIC2 0xA0 /* IO base address for slave PIC */
+#define PIC1_COMMAND PIC1
+#define PIC1_DATA (PIC1 + 1)
+#define PIC2_COMMAND PIC2
+#define PIC2_DATA (PIC2 + 1)
-#define PIC_EOI 0x20 /* End-of-interrupt command code */
+#define PIC_EOI 0x20 /* End-of-interrupt command code */
-#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
-#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
-#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
-#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
-#define ICW1_INIT 0x10 /* Initialization - required! */
+#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
+#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
+#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
+#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
+#define ICW1_INIT 0x10 /* Initialization - required! */
-#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
-#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
-#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
-#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
-#define ICW4_SFNM 0x10 /* Special fully nested (not) */
+#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
+#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
+#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
+#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
+#define ICW4_SFNM 0x10 /* Special fully nested (not) */
-void pic_remap(void) {
+void pic_remap(void)
+{
uint8_t a1, a2;
- a1 = inb(PIC1_DATA); // save masks
+ a1 = inb(PIC1_DATA); // save masks
a2 = inb(PIC2_DATA);
- outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); // starts the initialization sequence (in cascade mode)
+ outb(PIC1_COMMAND,
+ ICW1_INIT |
+ ICW1_ICW4); // starts the initialization sequence (in cascade mode)
io_wait();
outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
io_wait();
- outb(PIC1_DATA, PIC_REMAP_OFFSET); // ICW2: Master PIC vector offset
+ outb(PIC1_DATA, PIC_REMAP_OFFSET); // ICW2: Master PIC vector offset
io_wait();
- outb(PIC2_DATA, PIC_REMAP_OFFSET + 8); // ICW2: Slave PIC vector offset
+ outb(PIC2_DATA, PIC_REMAP_OFFSET + 8); // ICW2: Slave PIC vector offset
io_wait();
- outb(PIC1_DATA, 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
+ outb(
+ PIC1_DATA,
+ 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
io_wait();
- outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
+ outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
io_wait();
- outb(PIC1_DATA, ICW4_8086); // ICW4: have the PICs use 8086 mode (and not 8080 mode)
+ outb(PIC1_DATA,
+ ICW4_8086); // ICW4: have the PICs use 8086 mode (and not 8080 mode)
io_wait();
outb(PIC2_DATA, ICW4_8086);
io_wait();
- outb(PIC1_DATA, a1); // restore saved masks.
+ outb(PIC1_DATA, a1); // restore saved masks.
outb(PIC2_DATA, a2);
}
-void pic_mask(int irq) {
+void pic_mask(int irq)
+{
uint16_t port;
uint8_t mask;
if (irq < 8) {
@@ -64,7 +71,8 @@ void pic_mask(int irq) {
outb(port, mask);
}
-void pic_unmask(int irq) {
+void pic_unmask(int irq)
+{
uint16_t port;
uint8_t mask;
if (irq < 8) {
@@ -77,12 +85,14 @@ void pic_unmask(int irq) {
outb(port, mask);
}
-void pic_disable(void) {
+void pic_disable(void)
+{
outb(PIC1_DATA, 0xff);
outb(PIC2_DATA, 0xff);
}
-void pic_eoi(int irq) {
+void pic_eoi(int irq)
+{
if (irq >= 8) {
outb(PIC2_COMMAND, PIC_EOI);
}
diff --git a/kernel/io/io.c b/kernel/io/io.c
index 11acfdb..489148d 100644
--- a/kernel/io/io.c
+++ b/kernel/io/io.c
@@ -3,14 +3,17 @@
#include <comus/asm.h>
#define PORT 0x3F8
-static void serial_out(uint8_t ch) {
+static void serial_out(uint8_t ch)
+{
// wait for output to be free
- while ((inb(PORT + 5) & 0x20) == 0);
+ while ((inb(PORT + 5) & 0x20) == 0)
+ ;
outb(PORT, ch);
}
-void fputc(FILE *stream, char c) {
- (void) stream;
+void fputc(FILE *stream, char c)
+{
+ (void)stream;
serial_out(c);
}
diff --git a/kernel/io/panic.c b/kernel/io/panic.c
index 948542e..403418f 100644
--- a/kernel/io/panic.c
+++ b/kernel/io/panic.c
@@ -2,8 +2,8 @@
#include <stdarg.h>
#include <comus/asm.h>
-__attribute__((noreturn))
-void panic(const char *format, ...) {
+__attribute__((noreturn)) void panic(const char *format, ...)
+{
cli();
va_list list;
va_start(list, format);
diff --git a/kernel/mboot/mboot.c b/kernel/mboot/mboot.c
index 08a0f37..9156c3c 100644
--- a/kernel/mboot/mboot.c
+++ b/kernel/mboot/mboot.c
@@ -3,13 +3,13 @@
void *locate_mboot_table(volatile void *mboot, uint32_t type)
{
- struct mboot_info *info = (struct mboot_info *) mboot;
- const char *mboot_end = ((char *) info) + info->total_size;
+ struct mboot_info *info = (struct mboot_info *)mboot;
+ const char *mboot_end = ((char *)info) + info->total_size;
char *tag_ptr = info->tags;
while (tag_ptr < mboot_end) {
- struct mboot_tag *tag = (struct mboot_tag *) tag_ptr;
+ struct mboot_tag *tag = (struct mboot_tag *)tag_ptr;
if (tag->type == type)
return tag;
diff --git a/kernel/mboot/mboot.h b/kernel/mboot/mboot.h
index 39a961d..db85de1 100644
--- a/kernel/mboot/mboot.h
+++ b/kernel/mboot/mboot.h
@@ -11,14 +11,14 @@
#include <lib.h>
-#define MBOOT_HEADER_MAGIC 0x36D76289
+#define MBOOT_HEADER_MAGIC 0x36D76289
-#define MBOOT_CMDLINE 1
-#define MBOOT_MEMORY_MAP 6
-#define MBOOT_FRAMEBUFFER 8
-#define MBOOT_ELF_SYMBOLS 9
-#define MBOOT_OLD_RSDP 14
-#define MBOOT_NEW_RSDP 15
+#define MBOOT_CMDLINE 1
+#define MBOOT_MEMORY_MAP 6
+#define MBOOT_FRAMEBUFFER 8
+#define MBOOT_ELF_SYMBOLS 9
+#define MBOOT_OLD_RSDP 14
+#define MBOOT_NEW_RSDP 15
struct mboot_info {
uint32_t total_size;
@@ -70,7 +70,6 @@ struct mboot_tag_mmap {
struct mboot_mmap_entry entries[];
};
-
struct mboot_tag_old_rsdp {
uint32_t type;
uint32_t size;
diff --git a/kernel/mboot/mmap.c b/kernel/mboot/mmap.c
index c17d510..ff38771 100644
--- a/kernel/mboot/mmap.c
+++ b/kernel/mboot/mmap.c
@@ -5,41 +5,30 @@
#include <stdint.h>
#include <stdio.h>
-static const char *segment_type[] = {
- "Reserved",
- "Free",
- "Reserved",
- "ACPI Reserved",
- "Hibernation",
- "Defective",
- "Unknown"
-};
+static const char *segment_type[] = { "Reserved", "Free",
+ "Reserved", "ACPI Reserved",
+ "Hibernation", "Defective",
+ "Unknown" };
void mboot_load_mmap(volatile void *mboot, struct memory_map *res)
{
void *tag = locate_mboot_table(mboot, MBOOT_MEMORY_MAP);
- struct mboot_tag_mmap *mmap = (struct mboot_tag_mmap *) tag;
+ struct mboot_tag_mmap *mmap = (struct mboot_tag_mmap *)tag;
int idx = 0;
uintptr_t i = (uintptr_t)mmap->entries;
printf("MEMORY MAP\n");
char buf[20];
- for (;
- i < (uintptr_t)mmap->entries + mmap->size;
- i += mmap->entry_size, idx++
- ) {
- struct mboot_mmap_entry *seg = (struct mboot_mmap_entry *) i;
+ for (; i < (uintptr_t)mmap->entries + mmap->size;
+ i += mmap->entry_size, idx++) {
+ struct mboot_mmap_entry *seg = (struct mboot_mmap_entry *)i;
const char *type = NULL;
if (seg->type > 6)
type = segment_type[6];
else
type = segment_type[seg->type];
- printf("ADDR: %16p LEN: %4s TYPE: %s (%d)\n",
- (void *)seg->addr,
- btoa(seg->len, buf),
- type,
- seg->type
- );
+ printf("ADDR: %16p LEN: %4s TYPE: %s (%d)\n", (void *)seg->addr,
+ btoa(seg->len, buf), type, seg->type);
if (seg->type != 1 || seg->len < 1)
continue;
res->entries[idx].addr = seg->addr;
generated by cgit v1.2.3-freya (git 2.51.0) at 2025-09-22 19:22:09 +0000