#include "mmap.h" #define ADDR(x) ((unsigned)&x - 0xc0000000 + 0x2000) boot_info_t info __attribute__((section(".init"))); __attribute__((section(".multiboot.text"))) void multiboot_strncpy(char *dest, const char *src, unsigned n) { for (unsigned i = 0; i < n && src[i] != '\0'; ++i) dest[i] = src[i]; } __attribute__((section(".multiboot.text"))) void multiboot2_module(struct multiboot_tag_module *tag, boot_info_t *tag_info) { tag_info->module_start = tag->mod_start; tag_info->module_end = tag->mod_end; multiboot_strncpy(tag_info->module_cmdline, tag->cmdline, 64); } /** * parse multiboot2 structures */ __attribute__((section(".multiboot.text"))) void __multiboot2(multiboot_uint32_t addr) { boot_info_t *__info = (boot_info_t *)ADDR(info); struct multiboot_tag *tag; for (tag = (struct multiboot_tag *)(addr + 8); tag->type != MULTIBOOT_TAG_TYPE_END; tag = (struct multiboot_tag *)((multiboot_uint8_t *)tag + ((tag->size + 7u) & ~7u))) { switch (tag->type) { case MULTIBOOT_TAG_TYPE_CMDLINE: multiboot_strncpy(__info->cmdline, ((struct multiboot_tag_string *)tag)->string, 64); break; case MULTIBOOT_TAG_TYPE_MODULE: multiboot2_module((struct multiboot_tag_module *)tag, __info); break; case MULTIBOOT_TAG_TYPE_MMAP: multiboot2_mmap(((struct multiboot_tag_mmap *)tag)->entries, ((struct multiboot_tag_mmap *)tag)->size / ((struct multiboot_tag_mmap *)tag)->entry_size, __info->bitmap); break; default: break; } // switch } // for }