-#include <lunaix/constants.h>
+#include <lunaix/common.h>
#include <lunaix/tty/tty.h>
+#include <lunaix/clock.h>
+#include <lunaix/lxconsole.h>
+#include <lunaix/mm/kalloc.h>
#include <lunaix/mm/page.h>
#include <lunaix/mm/pmm.h>
#include <lunaix/mm/vmm.h>
-#include <lunaix/mm/dmm.h>
+#include <lunaix/process.h>
+#include <lunaix/sched.h>
#include <lunaix/spike.h>
+#include <lunaix/syslog.h>
+#include <lunaix/timer.h>
+
+#include <hal/rtc.h>
#include <arch/x86/boot/multiboot.h>
#include <arch/x86/idt.h>
+#include <arch/x86/interrupts.h>
-#include <libc/stdio.h>
+#include <klibc/stdio.h>
+#include <klibc/string.h>
-#include <stdint.h>
#include <stddef.h>
-
+#include <stdint.h>
extern uint8_t __kernel_start;
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
+__proc0(); /* proc0.c */
+
void
-setup_memory(multiboot_memory_map_t* map, size_t map_size);
+spawn_proc0();
void
-setup_kernel_runtime();
+setup_memory(multiboot_memory_map_t* map, size_t map_size);
void
-_kernel_pre_init(multiboot_info_t* mb_info) {
+_kernel_pre_init()
+{
_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();
+ rtc_init();
+
+ 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);
+
+ tty_init((void*)VGA_BUFFER_VADDR);
+ tty_set_theme(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
- tty_init((void*)VGA_BUFFER_PADDR);
- tty_set_theme(VGA_COLOR_GREEN, VGA_COLOR_BLACK);
+ __kernel_ptd = cpu_rcr3();
+
+ tmp = (struct proc_info){ .page_table = __kernel_ptd };
+
+ __current = &tmp;
}
void
-_kernel_init(multiboot_info_t* mb_info) {
- printf("[KERNEL] === Initialization === \n");
+_kernel_init()
+{
+ lxconsole_init();
- printf("[MM] Mem: %d KiB, Extended Mem: %d KiB\n",
- mb_info->mem_lower,
- mb_info->mem_upper);
+ kprintf(KINFO "[MM] Allocated %d pages for stack start at %p\n",
+ KSTACK_SIZE >> PG_SIZE_BITS,
+ KSTACK_START);
- unsigned int map_size = mb_info->mmap_length / sizeof(multiboot_memory_map_t);
- setup_memory((multiboot_memory_map_t*)mb_info->mmap_addr, map_size);
- setup_kernel_runtime();
+ sched_init();
+
+ spawn_proc0();
}
-void
-_kernel_post_init() {
- printf("[KERNEL] === Post Initialization === \n");
- 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);
+/**
+ * @brief 创建并运行proc0进程
+ *
+ */
+void
+spawn_proc0()
+{
+ struct proc_info* proc0 = alloc_process();
+
+ /**
+ * @brief
+ * 注意：这里和视频中说的不一样，属于我之后的一点微调。
+ * 在视频中，spawn_proc0是在_kernel_post_init的末尾才调用的。并且是直接跳转到_proc0
+ *
+ * 但是我后来发现，上述的方法会产生竞态条件。这是因为spawn_proc0被调用的时候，时钟中断已经开启，
+ * 而中断的产生会打乱栈的布局，从而使得下面的上下文设置代码产生未定义行为（Undefined
+ * Behaviour）。 为了保险起见，有两种办法：
+ * 1. 在创建proc0进程前关闭中断
+ * 2. 将_kernel_post_init搬进proc0进程
+ * （_kernel_post_init已经更名为init_platform）
+ *
+ * 目前的解决方案是2
+ */
+
+ proc0->intr_ctx = (isr_param){ .registers = { .ds = KDATA_SEG,
+ .es = KDATA_SEG,
+ .fs = KDATA_SEG,
+ .gs = KDATA_SEG },
+ .cs = KCODE_SEG,
+ .eip = (void*)__proc0,
+ .ss = KDATA_SEG,
+ .eflags = cpu_reflags() };
+ proc0->parent = proc0;
+
+ // 方案1：必须在读取eflags之后禁用。否则当进程被调度时，中断依然是关闭的！
+ // cpu_disable_interrupt();
+
+ /* Ok... 首先fork进我们的零号进程，而后由那里，我们fork进init进程。 */
+
+ // 把当前虚拟地址空间（内核）复制一份。
+ proc0->page_table = vmm_dup_vmspace(proc0->pid);
+
+ // 直接切换到新的拷贝，进行配置。
+ cpu_lcr3(proc0->page_table);
- // 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));
+ // 为内核创建一个专属栈空间。
+ for (size_t i = 0; i < (KSTACK_SIZE >> PG_SIZE_BITS); i++) {
+ uintptr_t pa = pmm_alloc_page(KERNEL_PID, 0);
+ vmm_set_mapping(PD_REFERENCED,
+ KSTACK_START + (i << PG_SIZE_BITS),
+ pa,
+ PG_PREM_RW,
+ VMAP_NULL);
}
- assert(dmm_init());
+ // 手动设置进程上下文：用于第一次调度
+ asm volatile("movl %%esp, %%ebx\n"
+ "movl %1, %%esp\n"
+ "pushf\n"
+ "pushl %2\n"
+ "pushl %3\n"
+ "pushl $0\n"
+ "pushl $0\n"
+ "movl %%esp, %0\n"
+ "movl %%ebx, %%esp\n"
+ : "=m"(proc0->intr_ctx.registers.esp)
+ : "i"(KSTACK_TOP), "i"(KCODE_SEG), "r"(proc0->intr_ctx.eip)
+ : "%ebx", "memory");
+
+ // 向调度器注册进程。
+ commit_process(proc0);
+
+ // 由于时钟中断与APIC未就绪，我们需要手动进行第一次调度。这里也会同时隐式地恢复我们的eflags.IF位
+ proc0->state = PS_RUNNING;
+ asm volatile("pushl %0\n"
+ "jmp switch_to\n" ::"r"(proc0));
+
+ /* Should not return */
+ assert_msg(0, "Unexpected Return");
}
+extern void __usrtext_start;
+extern void __usrtext_end;
+
// 按照 Memory map 标识可用的物理页
void
-setup_memory(multiboot_memory_map_t* map, size_t map_size) {
+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];
- printf("[MM] Base: 0x%x, len: %u KiB, type: %u\n",
- map[i].addr_low,
- map[i].len_low >> 10,
- map[i].type);
if (mmap.type == MULTIBOOT_MEMORY_AVAILABLE) {
// 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",
- map[i].len_low >> PG_SIZE_BITS,
- pg & ~0x0fffU);
+ pmm_mark_chunk_free(pg >> PG_SIZE_BITS,
+ map[i].len_low >> PG_SIZE_BITS);
}
}
- // 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);
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);
-
+
+ // 首先，标记VGA部分为已占用，并且锁定
+ pmm_mark_chunk_occupied(
+ KERNEL_PID, VGA_BUFFER_PADDR >> PG_SIZE_BITS, vga_buf_pgs, PP_FGLOCKED);
+
// 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(
- (void*)(VGA_BUFFER_VADDR + (i << PG_SIZE_BITS)),
- (void*)(VGA_BUFFER_PADDR + (i << PG_SIZE_BITS)),
- PG_PREM_RW
- );
+ for (size_t i = 0; i < vga_buf_pgs; i++) {
+ vmm_set_mapping(PD_REFERENCED,
+ VGA_BUFFER_VADDR + (i << PG_SIZE_BITS),
+ VGA_BUFFER_PADDR + (i << PG_SIZE_BITS),
+ PG_PREM_URW,
+ VMAP_NULL);
}
-
- // 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);
+ for (uintptr_t i = &__usrtext_start; i < &__usrtext_end; i += PG_SIZE) {
+ vmm_set_mapping(PD_REFERENCED, i, V2P(i), PG_PREM_UR, VMAP_NULL);
}
- printf("[MM] Allocated %d pages for stack start at %p\n", K_STACK_SIZE>>PG_SIZE_BITS, K_STACK_START);
-}
\ No newline at end of file
+}
git://scm.lunaixsky.com / lunaix-os.git / blobdiff