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Kernel address space isolation and make the kernel heap global to all processes.
[lunaix-os.git] / lunaix-os / kernel / k_init.c
diff --git a/lunaix-os/kernel/k_init.c b/lunaix-os/kernel/k_init.c
index 07091ca53fcfaab4db805b330c384145df1c75cd..c119676bf5874017ac92f1e00bbe681dbf120be1 100644 (file)
--- a/lunaix-os/kernel/k_init.c
+++ b/lunaix-os/kernel/k_init.c
@@ -1,11 +1,30 @@
-#include <lunaix/constants.h>
+#include <lunaix/common.h>
 #include <lunaix/tty/tty.h>
 
 #include <lunaix/mm/page.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/vmm.h>
 #include <lunaix/tty/tty.h>
 
 #include <lunaix/mm/page.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/vmm.h>
+#include <lunaix/mm/kalloc.h>
+#include <lunaix/spike.h>
+#include <lunaix/syslog.h>
+#include <lunaix/timer.h>
+#include <lunaix/clock.h>
+#include <lunaix/peripheral/ps2kbd.h>
+#include <lunaix/process.h>
+#include <lunaix/sched.h>
+#include <lunaix/syscall.h>
+
+#include <hal/rtc.h>
+#include <hal/apic.h>
+#include <hal/ioapic.h>
+#include <hal/acpi/acpi.h>
 
 #include <arch/x86/boot/multiboot.h>
 
 #include <arch/x86/boot/multiboot.h>
+#include <arch/x86/idt.h>
+#include <arch/x86/interrupts.h>
+
+#include <klibc/stdio.h>
+#include <klibc/string.h>
 
 #include <stdint.h>
 #include <stddef.h>
 
 #include <stdint.h>
 #include <stddef.h>
@@ -15,48 +34,179 @@ extern uint8_t __kernel_start;
 extern uint8_t __kernel_end;
 extern uint8_t __init_hhk_end;
 
 extern uint8_t __kernel_end;
 extern uint8_t __init_hhk_end;
 
+#define PP_KERN_SHARED (PP_FGSHARED | PP_TKERN)
+
+// Set remotely by kernel/asm/x86/prologue.S
+multiboot_info_t* _k_init_mb_info;
+
+x86_page_table* __kernel_ptd;
+
+struct proc_info tmp;
+
+LOG_MODULE("BOOT");
+
+extern void _lxinit_main();
+void spawn_lxinit();
+void _kernel_post_init();
+
+void
+setup_memory(multiboot_memory_map_t* map, size_t map_size);
+
 void
 void
-_kernel_pre_init(multiboot_info_t* mb_info) {
+lock_reserved_memory();
+
+void
+_kernel_pre_init() {
     _init_idt();
     _init_idt();
+    intr_routine_init();
 
 
-    pmm_init(MEM_1MB + (mb_info->mem_upper << 10));
+    pmm_init(MEM_1MB + (_k_init_mb_info->mem_upper << 10));
     vmm_init();
     vmm_init();
+    rtc_init();
 
     tty_init((void*)VGA_BUFFER_PADDR);
 
     tty_init((void*)VGA_BUFFER_PADDR);
-    tty_set_theme(VGA_COLOR_GREEN, VGA_COLOR_BLACK);
+    tty_set_theme(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
+
+    __kernel_ptd = cpu_rcr3();
+
+    tmp = (struct proc_info) {
+        .page_table = __kernel_ptd
+    };
+
+    __current = &tmp;
 }
 
 void
 }
 
 void
-_kernel_init(multiboot_info_t* mb_info) {
-    printf("[KERNEL] === Initialization === \n");
+_kernel_init() {
+    kprintf("[MM] Mem: %d KiB, Extended Mem: %d KiB\n",
+           _k_init_mb_info->mem_lower,
+           _k_init_mb_info->mem_upper);
+
+    unsigned int map_size = _k_init_mb_info->mmap_length / sizeof(multiboot_memory_map_t);
+    
+    setup_memory((multiboot_memory_map_t*)_k_init_mb_info->mmap_addr, map_size);
 
 
-    printf("[MM] Mem: %d KiB, Extended Mem: %d KiB\n",
-           mb_info->mem_lower,
-           mb_info->mem_upper);
+    // 为内核创建一个专属栈空间。
+    for (size_t i = 0; i < (KSTACK_SIZE >> PG_SIZE_BITS); i++) {
+        vmm_alloc_page(KERNEL_PID, (void*)(KSTACK_START + (i << PG_SIZE_BITS)), NULL, PG_PREM_RW, 0);
+    }
+    kprintf(KINFO "[MM] Allocated %d pages for stack start at %p\n", KSTACK_SIZE>>PG_SIZE_BITS, KSTACK_START);
+
+    sched_init();
+}
+
+/**
+ * @brief 创建并运行init进程
+ * 
+ */
+void spawn_lxinit() {
+    struct proc_info kinit;
+
+    memset(&kinit, 0, sizeof(kinit));
+    kinit.parent = -1;
+    kinit.pid = 1;
+    kinit.intr_ctx = (isr_param) {
+        .registers.esp = KSTACK_TOP - 20,
+        .cs = KCODE_SEG,
+        .eip = (void*)_lxinit_main,
+        .ss = KDATA_SEG,
+        .eflags = cpu_reflags()
+    };
+    kinit.page_table = dup_pagetable(kinit.pid);
+
+    // Ok... 准备fork进我们的init进程
+    /*
+        这里是一些栈的设置，因为我们将切换到一个新的地址空间里，并且使用一个全新的栈。
+        让iret满意！
+    */
+    asm volatile(
+        "movl %%cr3, %%eax\n"
+        "movl %%esp, %%ebx\n"
+        "movl %0, %%cr3\n"
+        "movl %1, %%esp\n"
+        "pushf\n"
+        "pushl %2\n"
+        "pushl %3\n"
+        "pushl $0\n"
+        "pushl $0\n"
+        "movl %%eax, %%cr3\n"
+        "movl %%ebx, %%esp\n"
+        ::"r"(kinit.page_table), "i"(KSTACK_TOP), "i"(KCODE_SEG), "r"(kinit.intr_ctx.eip)
+        :"%eax", "%ebx", "memory"
+    );
+
+    // 向调度器注册进程，然后这里阻塞等待调度器调度就好了。
+    push_process(&kinit);
 
 
-    unsigned int map_size = mb_info->mmap_length / sizeof(multiboot_memory_map_t);
-    setup_memory(mb_info->mmap_addr, map_size);
-    setup_kernel_runtime();
 }
 
 void 
 _kernel_post_init() {
 }
 
 void 
 _kernel_post_init() {
-    printf("[KERNEL] === Post Initialization === \n");
+    assert_msg(kalloc_init(), "Fail to initialize heap");
+    
     size_t hhk_init_pg_count = ((uintptr_t)(&__init_hhk_end)) >> PG_SIZE_BITS;
     size_t hhk_init_pg_count = ((uintptr_t)(&__init_hhk_end)) >> PG_SIZE_BITS;
-    printf("[MM] Releaseing %d pages from 0x0.\n", hhk_init_pg_count);
+    kprintf(KINFO "[MM] Releaseing %d pages from 0x0.\n", hhk_init_pg_count);
 
 
-    // 清除 hhk_init 与前1MiB的映射
-    for (size_t i = 0; i < hhk_init_pg_count; i++) {
-        vmm_unmap_page((void*)(i << PG_SIZE_BITS));
+    // Fuck it, I will no longer bother this little 1MiB
+    // I just release 4 pages for my APIC & IOAPIC remappings
+    for (size_t i = 0; i < 3; i++) {
+        vmm_unmap_page(KERNEL_PID, (void*)(i << PG_SIZE_BITS));
+    }
+    
+    // 锁定所有系统预留页（内存映射IO，ACPI之类的），并且进行1:1映射
+    lock_reserved_memory();
+
+    acpi_init(_k_init_mb_info);
+    uintptr_t ioapic_addr = acpi_get_context()->madt.ioapic->ioapic_addr;
+    pmm_mark_page_occupied(KERNEL_PID, FLOOR(__APIC_BASE_PADDR, PG_SIZE_BITS), 0);
+    pmm_mark_page_occupied(KERNEL_PID, FLOOR(ioapic_addr, PG_SIZE_BITS), 0);
+
+    vmm_set_mapping(KERNEL_PID, APIC_BASE_VADDR, __APIC_BASE_PADDR, PG_PREM_RW);
+    vmm_set_mapping(KERNEL_PID, IOAPIC_BASE_VADDR, ioapic_addr, PG_PREM_RW);
+
+    apic_init();
+    ioapic_init();
+    timer_init(SYS_TIMER_FREQUENCY_HZ);
+    clock_init();
+    ps2_kbd_init();
+
+    syscall_install();
+
+    for (size_t i = 256; i < hhk_init_pg_count; i++) {
+        vmm_unmap_page(KERNEL_PID, (void*)(i << PG_SIZE_BITS));
+    }
+
+    spawn_lxinit();
+
+    spin();
+}
+
+void
+lock_reserved_memory() {
+    multiboot_memory_map_t* mmaps = _k_init_mb_info->mmap_addr;
+    size_t map_size = _k_init_mb_info->mmap_length / sizeof(multiboot_memory_map_t);
+    for (unsigned int i = 0; i < map_size; i++) {
+        multiboot_memory_map_t mmap = mmaps[i];
+        if (mmap.type == MULTIBOOT_MEMORY_AVAILABLE) {
+            continue;
+        }
+        uint8_t* pa = PG_ALIGN(mmap.addr_low);
+        size_t pg_num = CEIL(mmap.len_low, PG_SIZE_BITS);
+        for (size_t j = 0; j < pg_num; j++)
+        {
+            vmm_set_mapping(KERNEL_PID, (pa + (j << PG_SIZE_BITS)), (pa + (j << PG_SIZE_BITS)), PG_PREM_R);
+        }
     }
 }
 
 // 按照 Memory map 标识可用的物理页
 void
 setup_memory(multiboot_memory_map_t* map, size_t map_size) {
     }
 }
 
 // 按照 Memory map 标识可用的物理页
 void
 setup_memory(multiboot_memory_map_t* map, size_t map_size) {
+
+    // First pass, to mark the physical pages
     for (unsigned int i = 0; i < map_size; i++) {
         multiboot_memory_map_t mmap = map[i];
     for (unsigned int i = 0; i < map_size; i++) {
         multiboot_memory_map_t mmap = map[i];
-        printf("[MM] Base: 0x%x, len: %u KiB, type: %u\n",
+        kprintf("[MM] Base: 0x%x, len: %u KiB, type: %u\n",
                map[i].addr_low,
                map[i].len_low >> 10,
                map[i].type);
                map[i].addr_low,
                map[i].len_low >> 10,
                map[i].type);
@@ -64,27 +214,28 @@ setup_memory(multiboot_memory_map_t* map, size_t map_size) {
             // 整数向上取整除法
             uintptr_t pg = map[i].addr_low + 0x0fffU;
             pmm_mark_chunk_free(pg >> PG_SIZE_BITS, map[i].len_low >> PG_SIZE_BITS);
             // 整数向上取整除法
             uintptr_t pg = map[i].addr_low + 0x0fffU;
             pmm_mark_chunk_free(pg >> PG_SIZE_BITS, map[i].len_low >> PG_SIZE_BITS);
-            printf("[MM] Freed %u pages start from 0x%x\n",
+            kprintf(KINFO "[MM] Freed %u pages start from 0x%x\n",
                    map[i].len_low >> PG_SIZE_BITS,
                    pg & ~0x0fffU);
         }
     }
 
                    map[i].len_low >> PG_SIZE_BITS,
                    pg & ~0x0fffU);
         }
     }
 
-    // 将内核占据的页设为已占用
-    size_t pg_count = (uintptr_t)(&__kernel_end - &__kernel_start) >> PG_SIZE_BITS;
-    pmm_mark_chunk_occupied(V2P(&__kernel_start) >> PG_SIZE_BITS, pg_count);
-    printf("[MM] Allocated %d pages for kernel.\n", pg_count);
+    // 将内核占据的页，包括前1MB，hhk_init 设为已占用
+    size_t pg_count = V2P(&__kernel_end) >> PG_SIZE_BITS;
+    pmm_mark_chunk_occupied(KERNEL_PID, 0, pg_count, 0);
+    kprintf(KINFO "[MM] Allocated %d pages for kernel.\n", pg_count);
 
 
     size_t vga_buf_pgs = VGA_BUFFER_SIZE >> PG_SIZE_BITS;
     
     // 首先，标记VGA部分为已占用
 
 
     size_t vga_buf_pgs = VGA_BUFFER_SIZE >> PG_SIZE_BITS;
     
     // 首先，标记VGA部分为已占用
-    pmm_mark_chunk_occupied(VGA_BUFFER_PADDR >> PG_SIZE_BITS, vga_buf_pgs);
+    pmm_mark_chunk_occupied(KERNEL_PID, VGA_BUFFER_PADDR >> PG_SIZE_BITS, vga_buf_pgs, 0);
     
     // 重映射VGA文本缓冲区（以后会变成显存，i.e., framebuffer）
     for (size_t i = 0; i < vga_buf_pgs; i++)
     {
         vmm_map_page(
     
     // 重映射VGA文本缓冲区（以后会变成显存，i.e., framebuffer）
     for (size_t i = 0; i < vga_buf_pgs; i++)
     {
         vmm_map_page(
+            KERNEL_PID,
             (void*)(VGA_BUFFER_VADDR + (i << PG_SIZE_BITS)), 
             (void*)(VGA_BUFFER_PADDR + (i << PG_SIZE_BITS)), 
             PG_PREM_RW
             (void*)(VGA_BUFFER_VADDR + (i << PG_SIZE_BITS)), 
             (void*)(VGA_BUFFER_PADDR + (i << PG_SIZE_BITS)), 
             PG_PREM_RW
@@ -94,14 +245,5 @@ setup_memory(multiboot_memory_map_t* map, size_t map_size) {
     // 更新VGA缓冲区位置至虚拟地址
     tty_set_buffer((void*)VGA_BUFFER_VADDR);
 
     // 更新VGA缓冲区位置至虚拟地址
     tty_set_buffer((void*)VGA_BUFFER_VADDR);
 
-    printf("[MM] Mapped VGA to %p.\n", VGA_BUFFER_VADDR);
-}
-
-void
-setup_kernel_runtime() {
-    // 为内核创建一个专属栈空间。
-    for (size_t i = 0; i < (K_STACK_SIZE >> PG_SIZE_BITS); i++) {
-        vmm_alloc_page((void*)(K_STACK_START + (i << PG_SIZE_BITS)), PG_PREM_RW);
-    }
-    printf("[MM] Allocated %d pages for stack start at %p\n", K_STACK_SIZE>>PG_SIZE_BITS, K_STACK_START);
+    kprintf(KINFO "[MM] Mapped VGA to %p.\n", VGA_BUFFER_VADDR);
 }
\ No newline at end of file
 }
\ No newline at end of file
The lunaix project - hobby kernel from scratch