[feat] 100Hz task switch

This commit is contained in:
2026-05-31 18:35:25 +08:00
Unverified
parent 4ff227bc75
commit daccb0a763
16 changed files with 1172 additions and 36 deletions
+13 -2
View File
@@ -18,9 +18,11 @@ BOOT_OBJ = build/boot.o
KERNEL_CPP = kernel/entry.cpp kernel/main.cpp kernel/serial.cpp kernel/fs.cpp \
kernel/memory/heap.cpp kernel/memory/pmm.cpp \
kernel/scheduler/scheduler.cpp \
kernel/interrupt/gdt.cpp kernel/interrupt/idt.cpp \
kernel/interrupt/pic.cpp kernel/interrupt/pit.cpp \
graphics/context.cpp graphics/draw.cpp \
fonts/pixel_font.cpp
KERNEL_ASM = kernel/scheduler/context_switch.S
KERNEL_ASM = kernel/scheduler/context_switch.S kernel/interrupt/isr.S kernel/interrupt/idt_helpers.S
KERNEL_OBJ = $(KERNEL_CPP:%.cpp=build/%.o) $(KERNEL_ASM:%.S=build/%.o)
EFI_TOP_C = $(wildcard efi/lib/*.c)
@@ -46,7 +48,7 @@ all: _bd $(EFI_OBJ) $(BOOT_OBJ) $(KERNEL_OBJ)
_bd:
@mkdir -p build/graphics build/kernel build/fonts build/kernel/memory \
build/kernel/scheduler \
build/kernel/scheduler build/kernel/interrupt \
build/efi/lib build/efi/lib/x86_64 build/efi/lib/runtime build/efi/gnuefi
$(EFI_CRT0_OBJ): efi/gnuefi/crt0-efi-x86_64.S | _bd
@@ -98,6 +100,15 @@ build/kernel/scheduler/%.o: kernel/scheduler/%.S | _bd
@gcc -Iinclude -Iefi/inc -ffreestanding -fno-stack-protector -fno-stack-check \
-fshort-wchar -mno-red-zone -fcf-protection=none -c $< -o $@
build/kernel/interrupt/%.o: kernel/interrupt/%.cpp | _bd
@echo "Compile CPP $<"
@g++ $(KERNEL_CXXFLAGS) -c $< -o $@
build/kernel/interrupt/%.o: kernel/interrupt/%.S | _bd
@echo "Compile AS $<"
@gcc -Iinclude -Iefi/inc -ffreestanding -fno-stack-protector -fno-stack-check \
-fshort-wchar -mno-red-zone -fcf-protection=none -c $< -o $@
build/graphics/%.o: graphics/%.cpp | _bd
@echo "Compile CPP $<"
@g++ $(KERNEL_CXXFLAGS) -c $< -o $@
+61
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@@ -0,0 +1,61 @@
#pragma once
#include <efi.h>
// GDT selectors
#define GDT_NULL 0x00
#define GDT_KERNEL_CODE 0x08
#define GDT_KERNEL_DATA 0x10
#define GDT_USER_CODE 0x18
#define GDT_USER_DATA 0x20
#define GDT_TSS 0x28
// GDT entry
struct gdt_entry {
UINT16 limit_low;
UINT16 base_low;
UINT8 base_mid;
UINT8 access;
UINT8 granularity;
UINT8 base_high;
} __attribute__((packed));
// GDT pointer
struct gdt_ptr {
UINT16 limit;
UINT64 base;
} __attribute__((packed));
// TSS (Task State Segment) — 64-bit mode uses only RSP0 and IST1-7
struct tss {
UINT32 reserved0;
UINT64 rsp0;
UINT64 rsp1;
UINT64 rsp2;
UINT64 reserved1;
UINT64 ist1;
UINT64 ist2;
UINT64 ist3;
UINT64 ist4;
UINT64 ist5;
UINT64 ist6;
UINT64 ist7;
UINT64 reserved2;
UINT16 reserved3;
UINT16 iopb_offset;
} __attribute__((packed));
// TSS descriptor in GDT (system segment, 16 bytes)
struct tss_descriptor {
UINT16 limit_low;
UINT16 base_low;
UINT8 base_mid;
UINT8 access;
UINT8 granularity;
UINT8 base_high;
UINT32 base_upper;
UINT32 reserved;
} __attribute__((packed));
void gdt_init(void);
void gdt_set_kernel_stack(UINT64 stack); // sets TSS.RSP0
+48
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@@ -0,0 +1,48 @@
#pragma once
#include <efi.h>
// IDT entry (64-bit gate descriptor)
struct idt_entry {
UINT16 offset_low;
UINT16 selector;
UINT8 ist; // IST index (bits 0-2), reserved (bits 3-6), type (bit 7)
UINT8 type_attr; // P (bit 7), DPL (bits 5-6), 0 (bit 4), type (bits 0-3)
UINT16 offset_mid;
UINT32 offset_high;
UINT32 reserved;
} __attribute__((packed));
struct idt_ptr {
UINT16 limit;
UINT64 base;
} __attribute__((packed));
// Interrupt frame saved by ISR stubs
struct trap_frame {
// Pushed by ISR stub (general-purpose registers)
UINT64 r11;
UINT64 r10;
UINT64 r9;
UINT64 r8;
UINT64 rdi;
UINT64 rsi;
UINT64 rdx;
UINT64 rcx;
UINT64 rax;
// Pushed by ISR stub (metadata)
UINT64 vector;
UINT64 error_code;
// Pushed by CPU (interrupt frame)
UINT64 rip;
UINT64 cs;
UINT64 rflags;
UINT64 rsp;
UINT64 ss;
} __attribute__((packed));
// Handler function type
typedef void (*isr_handler_t)(trap_frame*);
void idt_init(void);
void idt_set_handler(UINT8 vector, isr_handler_t handler);
+20
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@@ -0,0 +1,20 @@
#pragma once
#include <efi.h>
// 8259 PIC ports
#define PIC1_CMD 0x20
#define PIC1_DATA 0x21
#define PIC2_CMD 0xA0
#define PIC2_DATA 0xA1
// PIC vectors
#define PIC_IRQ_BASE 0x20 // IRQ 0 mapped to vector 0x20 (32)
// EOI signal
#define PIC_EOI 0x20
void pic_init(void);
void pic_send_eoi(UINT8 irq);
void pic_mask_irq(UINT8 irq);
void pic_unmask_irq(UINT8 irq);
+18
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@@ -0,0 +1,18 @@
#pragma once
#include <efi.h>
// PIT I/O ports
#define PIT_CHANNEL0_DATA 0x40
#define PIT_COMMAND_PORT 0x43
// PIT frequency
#define PIT_BASE_FREQ 1193182 // 1.193182 MHz
#define PIT_TICK_HZ 100 // 100 Hz tick (10ms per tick)
// Timer tick callback type
typedef void (*timer_callback_t)(void);
void pit_init(void);
void pit_set_tick_handler(timer_callback_t handler);
UINT64 pit_get_ticks(void);
+5
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@@ -7,6 +7,7 @@
#define TASK_STACK_SIZE (PAGE_SIZE * 4) // 16 KB kernel stack per task
#define TASK_MAX 32
#define TASK_NAME_LEN 32
#define TIME_SLICE_DEFAULT 5 // 5 ticks = 50ms at 100 Hz
typedef enum {
TASK_STATE_READY,
@@ -21,6 +22,7 @@ typedef struct task {
char name[TASK_NAME_LEN];
void* stack_base; // base address of kernel stack
struct task* next; // circular linked list
UINT32 time_slice; // remaining ticks before preemption
} task_t;
// Create a new task. Returns task pointer or NULL on failure.
@@ -37,3 +39,6 @@ void task_exit(void);
// Get current running task
task_t* scheduler_current(void);
// Timer tick handler — called by PIT IRQ 0, drives preemption
void scheduler_tick(void);
+1
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@@ -8,6 +8,7 @@ extern "C" void kernel_main();
extern "C" void _start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
(void)ImageHandle;
ST = SystemTable;
ASM("cli"); // disable interrupts until IDT is ready
kernel_main();
while (1) ASM ("hlt");
}
+71
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@@ -0,0 +1,71 @@
#include <gdt.h>
#include <common.h>
#include <serial.h>
static gdt_entry g_gdt[7]; // 5 segments + TSS (2 entries)
static gdt_ptr g_gdt_ptr;
static tss g_tss;
extern "C" void lgdt_and_reload(void* gdt_ptr);
extern "C" void tss_load(UINT16 selector);
static void gdt_set_entry(UINT32 index, UINT32 base, UINT32 limit,
UINT8 access, UINT8 granularity) {
g_gdt[index].limit_low = limit & 0xFFFF;
g_gdt[index].base_low = base & 0xFFFF;
g_gdt[index].base_mid = (base >> 16) & 0xFF;
g_gdt[index].access = access;
g_gdt[index].granularity = granularity | ((limit >> 16) & 0x0F);
g_gdt[index].base_high = (base >> 24) & 0xFF;
}
static void tss_set_descriptor(UINT32 index) {
UINT64 base = (UINT64)&g_tss;
UINT32 limit = sizeof(tss) - 1;
g_gdt[index].limit_low = limit & 0xFFFF;
g_gdt[index].base_low = base & 0xFFFF;
g_gdt[index].base_mid = (base >> 16) & 0xFF;
g_gdt[index].access = 0x89;
g_gdt[index].granularity = 0x00;
g_gdt[index].base_high = (base >> 24) & 0xFF;
g_gdt[index + 1].limit_low = (limit >> 16) & 0xFFFF;
g_gdt[index + 1].base_low = (base >> 32) & 0xFFFF;
g_gdt[index + 1].base_mid = (base >> 48) & 0xFF;
g_gdt[index + 1].access = 0;
g_gdt[index + 1].granularity = 0;
g_gdt[index + 1].base_high = 0;
}
void gdt_init(void) {
serial_write("GDT: initializing\n");
for (int i = 0; i < 7; i++) {
g_gdt[i] = {0};
}
gdt_set_entry(0, 0, 0, 0, 0);
gdt_set_entry(1, 0, 0xFFFFF, 0x9A, 0xA0);
gdt_set_entry(2, 0, 0xFFFFF, 0x92, 0xC0);
gdt_set_entry(3, 0, 0xFFFFF, 0xFA, 0xA0);
gdt_set_entry(4, 0, 0xFFFFF, 0xF2, 0xC0);
tss_set_descriptor(5);
g_tss = {};
g_tss.iopb_offset = sizeof(tss);
g_gdt_ptr.limit = sizeof(g_gdt) - 1;
g_gdt_ptr.base = (UINT64)&g_gdt[0];
serial_write("GDT: loading GDT + reloading segments\n");
lgdt_and_reload(&g_gdt_ptr);
serial_write("GDT: loading TSS\n");
tss_load(GDT_TSS);
serial_write("GDT: done\n");
}
void gdt_set_kernel_stack(UINT64 stack) {
g_tss.rsp0 = stack;
}
+66
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@@ -0,0 +1,66 @@
#include <idt.h>
#include <common.h>
#include <pic.h>
#include <serial.h>
// Defined in isr.S — 256 ISR stubs
extern "C" void* isr_stub_table[256];
static idt_entry g_idt[256];
static idt_ptr g_idt_ptr;
static isr_handler_t g_handlers[256] = {0};
void idt_set_handler(UINT8 vector, isr_handler_t handler) {
g_handlers[vector] = handler;
}
// Called from isr.S common handler
extern "C" void isr_dispatch(trap_frame* frame) {
UINT8 vector = (UINT8)frame->vector;
if (g_handlers[vector]) {
g_handlers[vector](frame);
} else if (vector < 32) {
serial_write("IDT: unhandled exception #");
serial_write_hex(vector);
serial_write(" error=");
serial_write_hex(frame->error_code);
serial_write("\n");
while (1) ASM("hlt");
}
}
// IDT helpers (defined in idt_helpers.S)
extern "C" void idt_load(UINT64 base, UINT16 limit);
static void idt_set_entry(UINT8 vector, UINT64 handler_addr) {
g_idt[vector].offset_low = handler_addr & 0xFFFF;
g_idt[vector].selector = 0x08; // kernel code segment
g_idt[vector].ist = 0;
g_idt[vector].type_attr = 0x8E; // present, DPL=0, 64-bit interrupt gate
g_idt[vector].offset_mid = (handler_addr >> 16) & 0xFFFF;
g_idt[vector].offset_high = (handler_addr >> 32) & 0xFFFFFFFF;
g_idt[vector].reserved = 0;
}
void idt_init(void) {
serial_write("IDT: initializing 256 entries\n");
// Clear IDT
for (int i = 0; i < 256; i++) {
g_idt[i] = {0};
g_handlers[i] = NULL;
}
// Install all 256 ISR stubs
for (int i = 0; i < 256; i++) {
idt_set_entry(i, (UINT64)isr_stub_table[i]);
}
// Load IDT
g_idt_ptr.limit = sizeof(g_idt) - 1;
g_idt_ptr.base = (UINT64)&g_idt[0];
idt_load(g_idt_ptr.base, g_idt_ptr.limit);
serial_write("IDT: loaded\n");
}
+33
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@@ -0,0 +1,33 @@
.intel_syntax noprefix
.global idt_load
idt_load:
sub rsp, 10
mov [rsp], si
mov [rsp + 2], rdi
lidt [rsp]
add rsp, 10
ret
.global lgdt_and_reload
lgdt_and_reload:
lgdt [rdi]
push 0x08
mov rax, offset .reload_cs
push rax
retfq
.reload_cs:
mov ax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
ret
.global tss_load
tss_load:
ltr di
ret
.section .note.GNU-stack,"",@progbits
+589
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@@ -0,0 +1,589 @@
.intel_syntax noprefix
// ISR stub table 256 entries
// For exceptions without error code, we push a dummy 0
// For exceptions with error code, the CPU already pushed it
// Macros for generating ISR stubs
.macro ISR_NOERR num
.global isr_stub_\num
isr_stub_\num:
push 0 // dummy error code
push \num // vector number
jmp isr_common
.endm
.macro ISR_ERR num
.global isr_stub_\num
isr_stub_\num:
// error code already on stack from CPU
push \num // vector number
jmp isr_common
.endm
// === Exceptions 0-31 ===
ISR_NOERR 0 // #DE Divide Error
ISR_NOERR 1 // #DB Debug
ISR_NOERR 2 // NMI
ISR_NOERR 3 // #BP Breakpoint
ISR_NOERR 4 // #OF Overflow
ISR_NOERR 5 // #BR Bound Range Exceeded
ISR_NOERR 6 // #UD Invalid Opcode
ISR_NOERR 7 // #NM Device Not Available
ISR_ERR 8 // #DF Double Fault
ISR_NOERR 9 // Coprocessor Segment Overrun (reserved)
ISR_ERR 10 // #TS Invalid TSS
ISR_ERR 11 // #NP Segment Not Present
ISR_ERR 12 // #SS Stack-Segment Fault
ISR_ERR 13 // #GP General Protection
ISR_ERR 14 // #PF Page Fault
ISR_NOERR 15 // Reserved
ISR_NOERR 16 // #MF x87 FPU Error
ISR_ERR 17 // #AC Alignment Check
ISR_NOERR 18 // #MC Machine Check
ISR_NOERR 19 // #XM SIMD Exception
ISR_NOERR 20 // Virtualization Exception
ISR_ERR 21 // #CP Control Protection
ISR_NOERR 22
ISR_NOERR 23
ISR_NOERR 24
ISR_NOERR 25
ISR_NOERR 26
ISR_NOERR 27
ISR_NOERR 28
ISR_ERR 29 // Hypervisor Injection
ISR_ERR 30 // #SX Security Exception
ISR_NOERR 31 // Reserved
// === Hardware IRQs 32-255 ===
ISR_NOERR 32 // PIT timer (IRQ 0)
ISR_NOERR 33 // Keyboard (IRQ 1)
ISR_NOERR 34 // Cascade (IRQ 2)
ISR_NOERR 35 // COM2 (IRQ 3)
ISR_NOERR 36 // COM1 (IRQ 4)
ISR_NOERR 37 // LPT2 (IRQ 5)
ISR_NOERR 38 // Floppy (IRQ 6)
ISR_NOERR 39 // LPT1 / Spurious (IRQ 7)
ISR_NOERR 40 // CMOS RTC (IRQ 8)
ISR_NOERR 41 // ACPI (IRQ 9)
ISR_NOERR 42 // Open (IRQ 10)
ISR_NOERR 43 // Open (IRQ 11)
ISR_NOERR 44 // PS/2 Mouse (IRQ 12)
ISR_NOERR 45 // FPU (IRQ 13)
ISR_NOERR 46 // Primary ATA (IRQ 14)
ISR_NOERR 47 // Secondary ATA (IRQ 15)
// Vectors 48-255: software / unused
ISR_NOERR 48
ISR_NOERR 49
ISR_NOERR 50
ISR_NOERR 51
ISR_NOERR 52
ISR_NOERR 53
ISR_NOERR 54
ISR_NOERR 55
ISR_NOERR 56
ISR_NOERR 57
ISR_NOERR 58
ISR_NOERR 59
ISR_NOERR 60
ISR_NOERR 61
ISR_NOERR 62
ISR_NOERR 63
ISR_NOERR 64
ISR_NOERR 65
ISR_NOERR 66
ISR_NOERR 67
ISR_NOERR 68
ISR_NOERR 69
ISR_NOERR 70
ISR_NOERR 71
ISR_NOERR 72
ISR_NOERR 73
ISR_NOERR 74
ISR_NOERR 75
ISR_NOERR 76
ISR_NOERR 77
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ISR_NOERR 79
ISR_NOERR 80
ISR_NOERR 81
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ISR_NOERR 172
ISR_NOERR 173
ISR_NOERR 174
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ISR_NOERR 241
ISR_NOERR 242
ISR_NOERR 243
ISR_NOERR 244
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ISR_NOERR 246
ISR_NOERR 247
ISR_NOERR 248
ISR_NOERR 249
ISR_NOERR 250
ISR_NOERR 251
ISR_NOERR 252
ISR_NOERR 253
ISR_NOERR 254
ISR_NOERR 255
// === Common ISR handler ===
// Stack layout on entry (from ISR stub):
// [rsp+0x00] vector (pushed by stub)
// [rsp+0x08] error_code (pushed by stub or CPU)
// [rsp+0x10] rip (pushed by CPU)
// [rsp+0x18] cs (pushed by CPU)
// [rsp+0x20] rflags (pushed by CPU)
// [rsp+0x28] rsp (pushed by CPU)
// [rsp+0x30] ss (pushed by CPU)
isr_common:
// Save all general-purpose registers to form trap_frame
push r11
push r10
push r9
push r8
push rdi
push rsi
push rdx
push rcx
push rax
// Now RSP points to trap_frame struct, pass as argument
mov rdi, rsp
call isr_dispatch
// Restore registers
pop rax
pop rcx
pop rdx
pop rsi
pop rdi
pop r8
pop r9
pop r10
pop r11
// Skip vector + error_code (16 bytes)
add rsp, 16
iretq
// === ISR stub table (array of pointers) ===
.section .data
.global isr_stub_table
isr_stub_table:
.quad isr_stub_0
.quad isr_stub_1
.quad isr_stub_2
.quad isr_stub_3
.quad isr_stub_4
.quad isr_stub_5
.quad isr_stub_6
.quad isr_stub_7
.quad isr_stub_8
.quad isr_stub_9
.quad isr_stub_10
.quad isr_stub_11
.quad isr_stub_12
.quad isr_stub_13
.quad isr_stub_14
.quad isr_stub_15
.quad isr_stub_16
.quad isr_stub_17
.quad isr_stub_18
.quad isr_stub_19
.quad isr_stub_20
.quad isr_stub_21
.quad isr_stub_22
.quad isr_stub_23
.quad isr_stub_24
.quad isr_stub_25
.quad isr_stub_26
.quad isr_stub_27
.quad isr_stub_28
.quad isr_stub_29
.quad isr_stub_30
.quad isr_stub_31
.quad isr_stub_32
.quad isr_stub_33
.quad isr_stub_34
.quad isr_stub_35
.quad isr_stub_36
.quad isr_stub_37
.quad isr_stub_38
.quad isr_stub_39
.quad isr_stub_40
.quad isr_stub_41
.quad isr_stub_42
.quad isr_stub_43
.quad isr_stub_44
.quad isr_stub_45
.quad isr_stub_46
.quad isr_stub_47
.quad isr_stub_48
.quad isr_stub_49
.quad isr_stub_50
.quad isr_stub_51
.quad isr_stub_52
.quad isr_stub_53
.quad isr_stub_54
.quad isr_stub_55
.quad isr_stub_56
.quad isr_stub_57
.quad isr_stub_58
.quad isr_stub_59
.quad isr_stub_60
.quad isr_stub_61
.quad isr_stub_62
.quad isr_stub_63
.quad isr_stub_64
.quad isr_stub_65
.quad isr_stub_66
.quad isr_stub_67
.quad isr_stub_68
.quad isr_stub_69
.quad isr_stub_70
.quad isr_stub_71
.quad isr_stub_72
.quad isr_stub_73
.quad isr_stub_74
.quad isr_stub_75
.quad isr_stub_76
.quad isr_stub_77
.quad isr_stub_78
.quad isr_stub_79
.quad isr_stub_80
.quad isr_stub_81
.quad isr_stub_82
.quad isr_stub_83
.quad isr_stub_84
.quad isr_stub_85
.quad isr_stub_86
.quad isr_stub_87
.quad isr_stub_88
.quad isr_stub_89
.quad isr_stub_90
.quad isr_stub_91
.quad isr_stub_92
.quad isr_stub_93
.quad isr_stub_94
.quad isr_stub_95
.quad isr_stub_96
.quad isr_stub_97
.quad isr_stub_98
.quad isr_stub_99
.quad isr_stub_100
.quad isr_stub_101
.quad isr_stub_102
.quad isr_stub_103
.quad isr_stub_104
.quad isr_stub_105
.quad isr_stub_106
.quad isr_stub_107
.quad isr_stub_108
.quad isr_stub_109
.quad isr_stub_110
.quad isr_stub_111
.quad isr_stub_112
.quad isr_stub_113
.quad isr_stub_114
.quad isr_stub_115
.quad isr_stub_116
.quad isr_stub_117
.quad isr_stub_118
.quad isr_stub_119
.quad isr_stub_120
.quad isr_stub_121
.quad isr_stub_122
.quad isr_stub_123
.quad isr_stub_124
.quad isr_stub_125
.quad isr_stub_126
.quad isr_stub_127
.quad isr_stub_128
.quad isr_stub_129
.quad isr_stub_130
.quad isr_stub_131
.quad isr_stub_132
.quad isr_stub_133
.quad isr_stub_134
.quad isr_stub_135
.quad isr_stub_136
.quad isr_stub_137
.quad isr_stub_138
.quad isr_stub_139
.quad isr_stub_140
.quad isr_stub_141
.quad isr_stub_142
.quad isr_stub_143
.quad isr_stub_144
.quad isr_stub_145
.quad isr_stub_146
.quad isr_stub_147
.quad isr_stub_148
.quad isr_stub_149
.quad isr_stub_150
.quad isr_stub_151
.quad isr_stub_152
.quad isr_stub_153
.quad isr_stub_154
.quad isr_stub_155
.quad isr_stub_156
.quad isr_stub_157
.quad isr_stub_158
.quad isr_stub_159
.quad isr_stub_160
.quad isr_stub_161
.quad isr_stub_162
.quad isr_stub_163
.quad isr_stub_164
.quad isr_stub_165
.quad isr_stub_166
.quad isr_stub_167
.quad isr_stub_168
.quad isr_stub_169
.quad isr_stub_170
.quad isr_stub_171
.quad isr_stub_172
.quad isr_stub_173
.quad isr_stub_174
.quad isr_stub_175
.quad isr_stub_176
.quad isr_stub_177
.quad isr_stub_178
.quad isr_stub_179
.quad isr_stub_180
.quad isr_stub_181
.quad isr_stub_182
.quad isr_stub_183
.quad isr_stub_184
.quad isr_stub_185
.quad isr_stub_186
.quad isr_stub_187
.quad isr_stub_188
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.quad isr_stub_190
.quad isr_stub_191
.quad isr_stub_192
.quad isr_stub_193
.quad isr_stub_194
.quad isr_stub_195
.quad isr_stub_196
.quad isr_stub_197
.quad isr_stub_198
.quad isr_stub_199
.quad isr_stub_200
.quad isr_stub_201
.quad isr_stub_202
.quad isr_stub_203
.quad isr_stub_204
.quad isr_stub_205
.quad isr_stub_206
.quad isr_stub_207
.quad isr_stub_208
.quad isr_stub_209
.quad isr_stub_210
.quad isr_stub_211
.quad isr_stub_212
.quad isr_stub_213
.quad isr_stub_214
.quad isr_stub_215
.quad isr_stub_216
.quad isr_stub_217
.quad isr_stub_218
.quad isr_stub_219
.quad isr_stub_220
.quad isr_stub_221
.quad isr_stub_222
.quad isr_stub_223
.quad isr_stub_224
.quad isr_stub_225
.quad isr_stub_226
.quad isr_stub_227
.quad isr_stub_228
.quad isr_stub_229
.quad isr_stub_230
.quad isr_stub_231
.quad isr_stub_232
.quad isr_stub_233
.quad isr_stub_234
.quad isr_stub_235
.quad isr_stub_236
.quad isr_stub_237
.quad isr_stub_238
.quad isr_stub_239
.quad isr_stub_240
.quad isr_stub_241
.quad isr_stub_242
.quad isr_stub_243
.quad isr_stub_244
.quad isr_stub_245
.quad isr_stub_246
.quad isr_stub_247
.quad isr_stub_248
.quad isr_stub_249
.quad isr_stub_250
.quad isr_stub_251
.quad isr_stub_252
.quad isr_stub_253
.quad isr_stub_254
.quad isr_stub_255
.section .note.GNU-stack,"",@progbits
+71
View File
@@ -0,0 +1,71 @@
#include <pic.h>
#include <common.h>
#include <serial.h>
static inline void outb(UINT16 port, UINT8 val) {
ASM("outb %0, %1" : : "a"(val), "Nd"(port));
}
static inline UINT8 inb(UINT16 port) {
UINT8 ret;
ASM("inb %1, %0" : "=a"(ret) : "Nd"(port));
return ret;
}
static void pic_wait(void) {
// Small delay for slow PICs
ASM("jmp 1f\n\t1: jmp 1f\n\t1:");
}
void pic_init(void) {
serial_write("PIC: remapping 8259 PIC\n");
// Save masks
UINT8 mask1 = inb(PIC1_DATA);
UINT8 mask2 = inb(PIC2_DATA);
// ICW1: begin initialization, ICW4 needed
outb(PIC1_CMD, 0x11); pic_wait();
outb(PIC2_CMD, 0x11); pic_wait();
// ICW2: vector offset
outb(PIC1_DATA, PIC_IRQ_BASE); // IRQ 0-7 → vector 0x20-0x27
pic_wait();
outb(PIC2_DATA, PIC_IRQ_BASE + 8); // IRQ 8-15 → vector 0x28-0x2F
pic_wait();
// ICW3: cascading
outb(PIC1_DATA, 0x04); pic_wait(); // slave on IRQ 2
outb(PIC2_DATA, 0x02); pic_wait(); // cascade identity
// ICW4: 8086 mode
outb(PIC1_DATA, 0x01); pic_wait();
outb(PIC2_DATA, 0x01); pic_wait();
// Restore masks
outb(PIC1_DATA, mask1);
outb(PIC2_DATA, mask2);
serial_write("PIC: remapped IRQ 0-7 → 0x20-0x27\n");
}
void pic_send_eoi(UINT8 irq) {
if (irq >= 8) {
outb(PIC2_CMD, PIC_EOI);
}
outb(PIC1_CMD, PIC_EOI);
}
void pic_mask_irq(UINT8 irq) {
UINT16 port = (irq < 8) ? PIC1_DATA : PIC2_DATA;
UINT8 shift = irq % 8;
UINT8 mask = inb(port) | (1 << shift);
outb(port, mask);
}
void pic_unmask_irq(UINT8 irq) {
UINT16 port = (irq < 8) ? PIC1_DATA : PIC2_DATA;
UINT8 shift = irq % 8;
UINT8 mask = inb(port) & ~(1 << shift);
outb(port, mask);
}
+48
View File
@@ -0,0 +1,48 @@
#include <pit.h>
#include <common.h>
#include <pic.h>
#include <serial.h>
static inline void outb(UINT16 port, UINT8 val) {
ASM("outb %0, %1" : : "a"(val), "Nd"(port));
}
static volatile UINT64 g_ticks = 0;
static timer_callback_t g_tick_handler = NULL;
extern "C" void pit_irq_handler(void) {
g_ticks++;
if (g_tick_handler) {
g_tick_handler();
}
}
void pit_init(void) {
serial_write("PIT: initializing channel 0 at ");
serial_write_hex(PIT_TICK_HZ);
serial_write(" Hz\n");
UINT32 divisor = PIT_BASE_FREQ / PIT_TICK_HZ;
// Command byte: channel 0, lobyte/hibyte, rate generator, binary
outb(PIT_COMMAND_PORT, 0x36);
// Send divisor (low byte first, then high byte)
outb(PIT_CHANNEL0_DATA, (UINT8)(divisor & 0xFF));
outb(PIT_CHANNEL0_DATA, (UINT8)((divisor >> 8) & 0xFF));
// Unmask IRQ 0 (timer)
pic_unmask_irq(0);
serial_write("PIT: divisor = ");
serial_write_hex(divisor);
serial_write("\n");
}
void pit_set_tick_handler(timer_callback_t handler) {
g_tick_handler = handler;
}
UINT64 pit_get_ticks(void) {
return g_ticks;
}
+50 -10
View File
@@ -8,11 +8,14 @@
#include <memory/heap.h>
#include <scheduler.h>
#include <fs.h>
#include <gdt.h>
#include <idt.h>
#include <pic.h>
#include <pit.h>
extern EFI_SYSTEM_TABLE *ST;
inline void init_gop() {
// 初始化 GOP
EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP;
uefi_call_wrapper(ST->BootServices->SetWatchdogTimer, 4, 0, 0, 0, NULL);
@@ -21,7 +24,6 @@ inline void init_gop() {
}
inline void init_serial() {
// 初始化串行驱动
EFI_SERIAL_IO_PROTOCOL *SerialIo = NULL;
EFI_GUID gEfiSerialIoProtocolGuid = EFI_SERIAL_IO_PROTOCOL_GUID;
EFI_HANDLE *SerialHandles = NULL;
@@ -45,6 +47,26 @@ inline void init_serial() {
}
}
// External: PIT IRQ handler defined in pit.cpp
extern "C" void pit_irq_handler(void);
// PIC IRQ handler — dispatches IRQ 0 (timer)
static void irq_handler(trap_frame* frame) {
UINT8 vector = (UINT8)frame->vector;
UINT8 irq = vector - PIC_IRQ_BASE;
switch (irq) {
case 0: // PIT timer
pit_irq_handler();
break;
default:
break;
}
// Send EOI to PIC
pic_send_eoi(irq);
}
extern "C" void kernel_main() {
init_gop();
init_serial();
@@ -53,7 +75,7 @@ extern "C" void kernel_main() {
uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, (CHAR16*)L"Kernel is running!\n");
uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut);
serial_write("\n\n"); // 防止和前面串了serial.log看不清
serial_write("\n\n");
// init memory managers
serial_write("Sylva: init PMM...\n");
@@ -108,27 +130,46 @@ extern "C" void kernel_main() {
pf_print("Welcome to Sylva OS!\n");
serial_write(" Kernel prepared well.\n");
// --- Interrupt infrastructure ---
serial_write("Sylva: init GDT...\n");
gdt_init();
serial_write("Sylva: init IDT...\n");
idt_init();
serial_write("Sylva: init PIC...\n");
pic_init();
// Register IRQ handler (vector 0x20 = PIC_IRQ_BASE + 0)
idt_set_handler(PIC_IRQ_BASE + 0, irq_handler);
serial_write("Sylva: init PIT...\n");
pit_init();
pit_set_tick_handler(scheduler_tick);
// Enable interrupts
ASM("sti");
serial_write("Sylva: interrupts enabled\n");
// --- Multitasking demo ---
serial_write("Sylva: creating tasks...\n");
// Task A: prints a message 3 times, yielding between each
// Task A: prints messages — preemption handles time slicing
task_create("taskA", []() {
for (int i = 0; i < 3; i++) {
serial_write("[taskA] running iteration ");
serial_write_hex(i);
serial_write("\n");
yield();
}
serial_write("[taskA] done\n");
});
// Task B: prints a message 5 times
// Task B: prints messages
task_create("taskB", []() {
for (int i = 0; i < 5; i++) {
serial_write("[taskB] hello from taskB #");
serial_write_hex(i);
serial_write("\n");
yield();
}
serial_write("[taskB] done\n");
});
@@ -136,10 +177,9 @@ extern "C" void kernel_main() {
// Task C: short task
task_create("taskC", []() {
serial_write("[taskC] quick task\n");
yield();
serial_write("[taskC] finished\n");
});
serial_write("Sylva: starting scheduler\n");
serial_write("Sylva: starting preemptive scheduler\n");
scheduler_run(); // never returns
}
}
+13 -1
View File
@@ -5,7 +5,19 @@
// rsi = new_rsp (value of new stack pointer)
//
// Saves/restores callee-saved registers only.
// On first switch into a new task, ret lands on task_entry_trampoline.
// The caller-saved registers are already saved on the task's stack
// by the ISR stub (for preemptive switching) or are not in use
// (for the initial switch).
//
// For preemptive switching:
// - Timer IRQ fires, ISR stub pushes rax-r11 + trap_frame
// - C code runs (isr_dispatch timer handler scheduler)
// - context_switch saves/restores callee-saved regs + switches RSP
// - On return, C code unwinds, isr_common pops rax-r11 + iretq
//
// For new tasks:
// - task_create sets up a fake trap_frame on the stack
// - context_switch pops callee-saved regs, returns into task_entry_trampoline
.global context_switch
context_switch:
push rbx
+65 -23
View File
@@ -1,4 +1,6 @@
#include <scheduler.h>
#include <idt.h>
#include <pic.h>
#include <memory/heap.h>
#include <memory/pmm.h>
#include <common.h>
@@ -13,16 +15,14 @@ static task_t* g_current = NULL;
static task_t* g_task_list = NULL; // circular linked list head
// Trampoline: first thing a new task runs after context_switch.
// The entry function pointer is stored in the task's name field
// (we repurpose a slot — actually we store it in a simple global array).
static void (*g_task_entries[TASK_MAX])(void);
extern "C" void task_entry_trampoline() {
task_t* cur = scheduler_current();
if (cur && g_task_entries[cur->id]) {
g_task_entries[cur->id](); // call the user function
g_task_entries[cur->id]();
}
task_exit(); // clean up when done
task_exit();
}
task_t* task_create(const char* name, void (*entry)(void)) {
@@ -34,7 +34,6 @@ task_t* task_create(const char* name, void (*entry)(void)) {
UINT32 id = g_task_count++;
task_t* task = &g_tasks[id];
// Store entry function for the trampoline
g_task_entries[id] = entry;
// Allocate kernel stack
@@ -47,10 +46,10 @@ task_t* task_create(const char* name, void (*entry)(void)) {
return NULL;
}
// Fill task struct
task->id = id;
task->state = TASK_STATE_READY;
task->stack_base = stack;
task->time_slice = TIME_SLICE_DEFAULT;
// Copy name
const char* s = name;
@@ -73,12 +72,13 @@ task_t* task_create(const char* name, void (*entry)(void)) {
// r14 = 0
// r15 = 0 <- RSP points here initially
//
// When preempted by timer IRQ, the ISR stub saves a full trap_frame
// on the task's stack — that layout is only created by hardware+ISR.
//
UINT64* sp = (UINT64*)((UINT8*)stack + TASK_STACK_SIZE);
// Push return address (task_entry_trampoline)
*--sp = (UINT64)task_entry_trampoline;
// Push callee-saved registers (all zero)
*--sp = 0; // rbx
*--sp = 0; // rbp
*--sp = 0; // r12
@@ -90,13 +90,12 @@ task_t* task_create(const char* name, void (*entry)(void)) {
// Insert into circular linked list
if (g_task_list == NULL) {
task->next = task; // points to itself (single element circle)
task->next = task;
g_task_list = task;
} else {
// Insert after current tail (g_task_list is the "last" in circle)
task->next = g_task_list->next;
g_task_list->next = task;
g_task_list = task; // new tail
g_task_list = task;
}
serial_write("SCHED: created task '");
@@ -108,28 +107,71 @@ task_t* task_create(const char* name, void (*entry)(void)) {
return task;
}
// Find next READY task in the circular list, starting from g_current->next
static task_t* find_next_ready(void) {
if (g_current == NULL || g_task_list == NULL) return NULL;
task_t* next = g_current->next;
task_t* start = next;
do {
if (next->state == TASK_STATE_READY) {
return next;
}
next = next->next;
} while (next != start);
return NULL; // no READY tasks
}
void yield(void) {
if (g_current == NULL || g_task_list == NULL) return;
task_t* cur = g_current;
task_t* next = cur->next;
task_t* next = find_next_ready();
// Skip terminated tasks
while (next->state == TASK_STATE_TERMINATED && next != cur) {
next = next->next;
}
if (next->state == TASK_STATE_TERMINATED) return; // all terminated
if (next == cur) return; // only one task, nothing to do
if (next == NULL || next == cur) return;
if (cur->state != TASK_STATE_TERMINATED)
cur->state = TASK_STATE_READY;
next->state = TASK_STATE_RUNNING;
next->time_slice = TIME_SLICE_DEFAULT;
g_current = next;
context_switch(&cur->rsp, next->rsp);
}
// Timer tick handler — called from PIT IRQ 0
void scheduler_tick(void) {
if (g_current == NULL) return;
// Decrement time slice
if (g_current->time_slice > 0) {
g_current->time_slice--;
}
// If time slice expired, preempt
if (g_current->time_slice == 0) {
task_t* cur = g_current;
task_t* next = find_next_ready();
if (next == NULL || next == cur) {
// No other task ready, or only this task — reload time slice
cur->time_slice = TIME_SLICE_DEFAULT;
return;
}
// Preempt
cur->state = TASK_STATE_READY;
cur->time_slice = TIME_SLICE_DEFAULT;
next->state = TASK_STATE_RUNNING;
next->time_slice = TIME_SLICE_DEFAULT;
g_current = next;
context_switch(&cur->rsp, next->rsp);
}
}
void scheduler_run(void) {
if (g_task_list == NULL) {
serial_write("SCHED: no tasks to run\n");
@@ -137,7 +179,7 @@ void scheduler_run(void) {
}
// Find first READY task
task_t* start = g_task_list->next; // head of circle
task_t* start = g_task_list->next;
task_t* t = start;
do {
if (t->state == TASK_STATE_READY) {
@@ -153,14 +195,14 @@ void scheduler_run(void) {
g_current = t;
t->state = TASK_STATE_RUNNING;
t->time_slice = TIME_SLICE_DEFAULT;
serial_write("SCHED: starting task '");
serial_write(t->name);
serial_write("'\n");
// First context switch — no old RSP to save (we're still in scheduler_run)
// Just switch to the task's stack directly.
// We need a dummy old_rsp to satisfy the API, but we never return here.
// First context switch — switch to the task's stack
// This will never return (until all tasks terminate)
UINT64 dummy_rsp;
context_switch(&dummy_rsp, t->rsp);