+++ /dev/null
-#include <lunaix/common.h>
-#include <lunaix/device.h>
-#include <lunaix/foptions.h>
-#include <lunaix/input.h>
-#include <lunaix/isrm.h>
-#include <lunaix/lxconsole.h>
-#include <lunaix/mm/cake.h>
-#include <lunaix/mm/mmio.h>
-#include <lunaix/mm/page.h>
-#include <lunaix/mm/pmm.h>
-#include <lunaix/mm/valloc.h>
-#include <lunaix/mm/vmm.h>
-#include <lunaix/process.h>
-#include <lunaix/sched.h>
-#include <lunaix/spike.h>
-#include <lunaix/syscall.h>
-#include <lunaix/tty/tty.h>
-#include <lunaix/types.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>
-
-extern u8_t __kernel_start;
-extern u8_t __kernel_end;
-extern u8_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;
-
-extern void
-__proc0(); /* proc0.c */
-
-void
-spawn_proc0();
-
-void
-setup_memory(multiboot_memory_map_t* map, size_t map_size);
-
-void
-_kernel_pre_init()
-{
- // interrupts
- _init_idt();
- isrm_init();
- intr_routine_init();
-
- // memory
- pmm_init(MEM_1MB + (_k_init_mb_info->mem_upper << 10));
- vmm_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);
-}
-
-void
-_kernel_init()
-{
- int errno = 0;
-
- // allocators
- cake_init();
- valloc_init();
-
- sched_init();
-
- // crt
- tty_init(ioremap(VGA_FRAMEBUFFER, PG_SIZE));
- tty_set_theme(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
-
- // file system & device subsys
- vfs_init();
- fsm_init();
- input_init();
-
- vfs_export_attributes();
-
- lxconsole_init();
-
- if ((errno = vfs_mount_root("ramfs", NULL))) {
- panickf("Fail to mount root. (errno=%d)", errno);
- }
-
- vfs_mount("/dev", "devfs", NULL, 0);
- vfs_mount("/sys", "twifs", NULL, MNT_RO);
- vfs_mount("/task", "taskfs", NULL, MNT_RO);
-
- lxconsole_spawn_ttydev();
- device_init_builtin();
-
- syscall_install();
-
- spawn_proc0();
-}
-
-/**
- * @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->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_ldvmspace(proc0->page_table);
-
- // 为内核创建一个专属栈空间。
- for (size_t i = 0; i < (KSTACK_SIZE >> PG_SIZE_BITS); i++) {
- ptr_t pa = pmm_alloc_page(KERNEL_PID, 0);
- vmm_set_mapping(VMS_SELF,
- KSTACK_START + (i << PG_SIZE_BITS),
- pa,
- PG_PREM_RW,
- VMAP_NULL);
- }
-
- struct exec_param* execp =
- (struct exec_param*)(KSTACK_TOP - sizeof(struct exec_param));
- isr_param* isrp = (isr_param*)((ptr_t)execp - sizeof(isr_param));
-
- *execp = (struct exec_param){ .cs = KCODE_SEG,
- .eip = (ptr_t)__proc0,
- .ss = KDATA_SEG,
- .eflags = cpu_reflags() };
- *isrp = (isr_param){ .registers = { .ds = KDATA_SEG,
- .es = KDATA_SEG,
- .fs = KDATA_SEG,
- .gs = KDATA_SEG },
- .execp = execp };
-
- proc0->intr_ctx = isrp;
-
- // 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");
-}
-
-// 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];
- if (mmap.type == MULTIBOOT_MEMORY_AVAILABLE) {
- // 整数向上取整除法
- ptr_t pg = map[i].addr_low + 0x0fffU;
- pmm_mark_chunk_free(pg >> PG_SIZE_BITS,
- map[i].len_low >> PG_SIZE_BITS);
- }
- }
-
- // 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, PP_FGLOCKED);
-
- // reserve higher half
- for (size_t i = L1_INDEX(KERNEL_MM_BASE); i < 1023; i++) {
- assert(vmm_set_mapping(VMS_SELF, i << 22, 0, 0, VMAP_NOMAP));
- }
-}
git://scm.lunaixsky.com / lunaix-os.git / blobdiff