+#include <lunaix/constants.h>
+#include <lunaix/tty/tty.h>
+
+#include <lunaix/mm/page.h>
+#include <lunaix/mm/pmm.h>
+#include <lunaix/mm/vmm.h>
+
+#include <arch/x86/boot/multiboot.h>
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+extern uint8_t __kernel_start;
+extern uint8_t __kernel_end;
+extern uint8_t __init_hhk_end;
+
+void
+_kernel_pre_init(multiboot_info_t* mb_info) {
+ _init_idt();
+
+ pmm_init(MEM_1MB + (mb_info->mem_upper << 10));
+ vmm_init();
+
+ tty_init((void*)VGA_BUFFER_PADDR);
+ tty_set_theme(VGA_COLOR_GREEN, VGA_COLOR_BLACK);
+}
+
+void
+_kernel_init(multiboot_info_t* mb_info) {
+ printf("[KERNEL] === Initialization === \n");
+
+ printf("[MM] Mem: %d KiB, Extended Mem: %d KiB\n",
+ mb_info->mem_lower,
+ mb_info->mem_upper);
+
+ 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() {
+ 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);
+
+ // 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));
+ }
+}
+
+// 按照 Memory map 标识可用的物理页
+void
+setup_memory(multiboot_memory_map_t* map, size_t map_size) {
+ 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);
+ }
+ }
+
+ // 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);
+
+
+ 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);
+
+ // 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, PG_PREM_RW
+ );
+ }
+
+ // 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, PG_PREM_RW);
+ }
+ 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 / commitdiff