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Merge pull request #2 from Azomasiel/interrupts

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Interrupts
This commit is contained in:
Julien CLEMENT 2021-07-16 15:12:40 +02:00 committed by GitHub
commit f7392578c9
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 330 additions and 23 deletions
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6
k/Makefile
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@ -31,7 +31,9 @@ OBJS = \
list.o \ list.o \
memory.o \ memory.o \
serial.o \ serial.o \
gdt.o gdt.o \
idt.o \
isr.o
DEPS = $(OBJS:.o=.d) DEPS = $(OBJS:.o=.d)
@ -39,7 +41,7 @@ DEPS = $(OBJS:.o=.d)
all: $(TARGET) all: $(TARGET)
$(TARGET): CPPFLAGS += -MMD -Iinclude -I ../libs/libc/include/ $(TARGET): CPPFLAGS += -MMD -Iinclude -I ../libs/libc/include/
$(TARGET): CFLAGS += $(K_EXTRA_CFLAGS) $(TARGET): CFLAGS += $(K_EXTRA_CFLAGS) -g
$(TARGET): LDFLAGS += -Wl,-Tk.lds $(TARGET): LDFLAGS += -Wl,-Tk.lds
$(TARGET): LDLIBS = -L../libs/libc -lc $(TARGET): LDLIBS = -L../libs/libc -lc
$(TARGET): $(OBJS) $(TARGET): $(OBJS)

26
k/gdt.c
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@ -2,7 +2,7 @@
static struct gdt gdt = { 0 }; static struct gdt gdt = { 0 };
static void create_kernel_ds() static void create_kernel_ds(void)
{ {
struct gdt_entry *entry = gdt.entries + KERNEL_DS_INDEX; struct gdt_entry *entry = gdt.entries + KERNEL_DS_INDEX;
@ -30,7 +30,7 @@ static void create_kernel_ds()
entry->base_3 = (base >> 24) & 0xff; entry->base_3 = (base >> 24) & 0xff;
} }
static void create_kernel_cs() static void create_kernel_cs(void)
{ {
struct gdt_entry *entry = gdt.entries + KERNEL_CS_INDEX; struct gdt_entry *entry = gdt.entries + KERNEL_CS_INDEX;
@ -58,13 +58,13 @@ static void create_kernel_cs()
entry->base_3 = (base >> 24) & 0xff; entry->base_3 = (base >> 24) & 0xff;
} }
static void create_gdt() static void create_gdt(void)
{ {
create_kernel_ds(); create_kernel_ds();
create_kernel_cs(); create_kernel_cs();
} }
static void load_gdt() static void load_gdt(void)
{ {
struct gdt_r gdtr; struct gdt_r gdtr;
gdtr.addr = (uint32_t)&gdt; gdtr.addr = (uint32_t)&gdt;
@ -76,12 +76,9 @@ static void load_gdt()
: "memory"); : "memory");
} }
static void load_ds() static void load_ds(void)
{ {
struct segment_selector selector; struct segment_selector selector = KERNEL_DS_SEGMENT_SELECTOR;
selector.index = KERNEL_DS_INDEX;
selector.table_indicator = 0;
selector.rpl = 0;
asm volatile("movw %0, %%ax\n" asm volatile("movw %0, %%ax\n"
"movw %%ax, %%ds\n" "movw %%ax, %%ds\n"
@ -93,12 +90,9 @@ static void load_ds()
: "ax"); : "ax");
} }
static void load_cs() static void load_cs(void)
{ {
struct segment_selector selector; struct segment_selector selector = KERNEL_CS_SEGMENT_SELECTOR;
selector.index = KERNEL_CS_INDEX;
selector.table_indicator = 0;
selector.rpl = 0;
asm volatile("pushl %0\n" asm volatile("pushl %0\n"
"pushl $1f\n" "pushl $1f\n"
@ -108,13 +102,13 @@ static void load_cs()
: "m" (selector)); : "m" (selector));
} }
static void reload_segment_selectors() static void reload_segment_selectors(void)
{ {
load_ds(); load_ds();
load_cs(); load_cs();
} }
void init_gdt() void init_gdt(void)
{ {
create_gdt(); create_gdt();
load_gdt(); load_gdt();

5
k/gdt.h
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@ -9,6 +9,9 @@
#define KERNEL_CS_INDEX 1 #define KERNEL_CS_INDEX 1
#define KERNEL_DS_INDEX 2 #define KERNEL_DS_INDEX 2
#define KERNEL_CS_SEGMENT_SELECTOR {0, 0, KERNEL_CS_INDEX}
#define KERNEL_DS_SEGMENT_SELECTOR {0, 0, KERNEL_DS_INDEX}
struct gdt_entry struct gdt_entry
{ {
uint16_t limit_1 : 16; // 16 lsbs of the segment limit uint16_t limit_1 : 16; // 16 lsbs of the segment limit
@ -60,6 +63,6 @@ struct segment_selector
uint16_t index : 13; // index of the entry in the table uint16_t index : 13; // index of the entry in the table
} __attribute__ ((packed)); } __attribute__ ((packed));
void init_gdt(); void init_gdt(void);
#endif /* !GDT_H */ #endif /* !GDT_H */

88
k/idt.c Normal file
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@ -0,0 +1,88 @@
#include "idt.h"
#include "stdio.h"
static struct idt idt = { 0 };
static struct idt_entry_descriptor idt_entries_descriptors[IDT_NB_ENTRIES] = {
{(uint32_t)&isr_divide, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 0
{(uint32_t)&isr_debug, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 1
{(uint32_t)&isr_nmi, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 2
{(uint32_t)&isr_breakpoint, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 3
{(uint32_t)&isr_overflow, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 4
{(uint32_t)&isr_bound_range_exceeded, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 5
{(uint32_t)&isr_invalid_opcode, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 6
{(uint32_t)&isr_device_not_available, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 7
{(uint32_t)&isr_double_fault, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 8
{(uint32_t)&isr_coprocessor_segment_overrun, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 9
{(uint32_t)&isr_invalid_tss, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 10
{(uint32_t)&isr_segment_not_present, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 11
{(uint32_t)&isr_stack_segment_fault, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 12
{(uint32_t)&isr_general_protection, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 13
{(uint32_t)&isr_page_fault, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 14
{0, {0, 0, 0}, 0}, // 15
{(uint32_t)&isr_fpu_floating_point_error, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 16
{(uint32_t)&isr_alignment_check, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 17
{(uint32_t)&isr_machine_check, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 18
{(uint32_t)&isr_simd_floating_point_exception, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 19
{(uint32_t)&isr_virtualization_exception, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 20
{(uint32_t)&isr_control_protection_exception, KERNEL_CS_SEGMENT_SELECTOR, INTERRUPT_TYPE}, // 21
{0, {0, 0, 0}, 0}, // 22
{0, {0, 0, 0}, 0}, // 23
{0, {0, 0, 0}, 0}, // 24
{0, {0, 0, 0}, 0}, // 25
{0, {0, 0, 0}, 0}, // 26
{0, {0, 0, 0}, 0}, // 27
{0, {0, 0, 0}, 0}, // 28
{0, {0, 0, 0}, 0}, // 29
{0, {0, 0, 0}, 0}, // 30
{0, {0, 0, 0}, 0} // 31
};
void interrupt_handler(struct isr_param *isr_param)
{
printf("Oh no %d!\r\n", isr_param->int_vector);
}
struct idt_entry create_idt_entry(struct idt_entry_descriptor descriptor)
{
struct idt_entry res = { 0 };
res.selector = descriptor.selector;
res.offset_1 = descriptor.offset & 0xffff;
res.offset_2 = (descriptor.offset >> 16) & 0xffff;
res.type = descriptor.type;
res.size = 1;
res.desc_priv = 0;
res.present = 1;
return res;
}
static void create_idt(void)
{
for (int i = 0; i < IDT_NB_ENTRIES; ++i)
{
struct idt_entry entry = create_idt_entry(idt_entries_descriptors[i]);
idt.entries[i] = entry;
}
}
static void load_idt(void)
{
struct idt_r idtr;
idtr.addr = (uint32_t)&idt;
idtr.limit = IDT_SIZE - 1;
asm volatile("lidt %0\n"
:
: "m" (idtr)
: "memory");
}
void init_idt(void)
{
create_idt();
load_idt();
}

51
k/idt.h Normal file
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@ -0,0 +1,51 @@
#ifndef IDT_H
#define IDT_H
#include <stdint.h>
#include "gdt.h"
#include "isr.h"
#define IDT_NB_ENTRIES 32
#define IDT_SIZE (IDT_NB_ENTRIES * sizeof(struct idt_entry))
#define INTERRUPT_TYPE 0x6
#define TRAP_TYPE 0x7
struct idt_entry
{
uint16_t offset_1 : 16;
struct segment_selector selector;
uint8_t zero_1 : 8; // unused, set to 0
uint8_t type : 3; // gate type
uint8_t size : 1;
uint8_t zero_2 : 1; // set to 0 for interrupt and trap gates
uint8_t desc_priv : 2; // Descriptor privilege
uint8_t present : 1;
uint16_t offset_2 : 16;
} __attribute__ ((packed));
struct idt
{
struct idt_entry entries[IDT_NB_ENTRIES];
};
struct idt_r
{
uint16_t limit;
uint32_t addr;
} __attribute__ ((packed));
struct idt_entry_descriptor
{
uint32_t offset;
struct segment_selector selector;
char type;
};
void init_idt(void);
void interrupt_handler(struct isr_param *isr_param);
#endif /* !IDT_H */

129
k/isr.S Normal file
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@ -0,0 +1,129 @@
.section .text
isr:
pushal
pushl %esp
add $32, (%esp)
call interrupt_handler
add $4, %esp
popal
add $8, %esp
iret
.global isr_divide
isr_divide:
pushl $0 // error code padding
pushl $0 // int vector
jmp isr
.global isr_debug
isr_debug:
pushl $0 // error code padding
pushl $1 // int vector
jmp isr
.global isr_nmi
isr_nmi:
pushl $0 // error code padding
pushl $2 // int vector
jmp isr
.global isr_breakpoint
isr_breakpoint:
pushl $0 // error code padding
pushl $3 // int vector
jmp isr
.global isr_overflow
isr_overflow:
pushl $0 // error code padding
pushl $4 // int vector
jmp isr
.global isr_bound_range_exceeded
isr_bound_range_exceeded:
pushl $0 // error code padding
pushl $5 // int vector
jmp isr
.global isr_invalid_opcode
isr_invalid_opcode:
pushl $0 // error code padding
pushl $6 // int vector
jmp isr
.global isr_device_not_available
isr_device_not_available:
pushl $0 // error code padding
pushl $7 // int vector
jmp isr
.global isr_double_fault
isr_double_fault:
pushl $8 // int vector
jmp isr
.global isr_coprocessor_segment_overrun
isr_coprocessor_segment_overrun:
pushl $0 // error code padding
pushl $9 // int vector
jmp isr
.global isr_invalid_tss
isr_invalid_tss:
pushl $10 // int vector
jmp isr
.global isr_segment_not_present
isr_segment_not_present:
pushl $11 // int vector
jmp isr
.global isr_stack_segment_fault
isr_stack_segment_fault:
pushl $12 // int vector
jmp isr
.global isr_general_protection
isr_general_protection:
pushl $13 // int vector
jmp isr
.global isr_page_fault
isr_page_fault:
pushl $14 // int vector
jmp isr
.global isr_fpu_floating_point_error
isr_fpu_floating_point_error:
pushl $0 // error code padding
pushl $16 // int vector
jmp isr
.global isr_alignment_check
isr_alignment_check:
pushl $17 // int vector
jmp isr
.global isr_machine_check
isr_machine_check:
pushl $0 // error code padding
pushl $18 // int vector
jmp isr
.global isr_simd_floating_point_exception
isr_simd_floating_point_exception:
pushl $0 // error code padding
pushl $19 // int vector
jmp isr
.global isr_virtualization_exception
isr_virtualization_exception:
pushl $0 // error code padding
pushl $20 // int vector
jmp isr
.global isr_control_protection_exception
isr_control_protection_exception:
pushl $21 // int vector
jmp isr

32
k/isr.h Normal file
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@ -0,0 +1,32 @@
#ifndef ISR_H
#define ISR_H
struct isr_param
{
uint32_t int_vector;
uint32_t error_code;
} __attribute__ ((packed));
void isr_divide(void);
void isr_debug(void);
void isr_nmi(void);
void isr_breakpoint(void);
void isr_overflow(void);
void isr_bound_range_exceeded(void);
void isr_invalid_opcode(void);
void isr_device_not_available(void);
void isr_double_fault(void);
void isr_coprocessor_segment_overrun(void);
void isr_invalid_tss(void);
void isr_segment_not_present(void);
void isr_stack_segment_fault(void);
void isr_general_protection(void);
void isr_page_fault(void);
void isr_fpu_floating_point_error(void);
void isr_alignment_check(void);
void isr_machine_check(void);
void isr_simd_floating_point_exception(void);
void isr_virtualization_exception(void);
void isr_control_protection_exception(void);
#endif /* !ISR_H */

16
k/k.c
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@ -23,15 +23,17 @@
*/ */
#include <k/kstd.h> #include <k/kstd.h>
#include "multiboot.h"
#include "stdio.h"
#include "serial.h"
#include "gdt.h" #include "gdt.h"
#include "idt.h"
#include "multiboot.h"
#include "serial.h"
#include "stdio.h"
static void k_init(void) static void k_init(void)
{ {
init_serial(); init_serial();
init_gdt(); init_gdt();
init_idt();
} }
void k_main(unsigned long magic, multiboot_info_t *info) void k_main(unsigned long magic, multiboot_info_t *info)
@ -43,8 +45,14 @@ void k_main(unsigned long magic, multiboot_info_t *info)
char *fb = (void *)0xb8000; char *fb = (void *)0xb8000;
k_init(); k_init();
asm volatile("int $3\n"
:
:
:);
printf("bonjour\r\n"); printf("bonjour\r\n");
for (unsigned i = 0; ; ) { for (unsigned i = 0; ; ) {
*fb = star[i++ % 4]; *fb = star[i++ % 4];
} }