96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
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#include "../include/multiboot2.h"
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uintptr_t multiboot2_boot_info_addr;
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uint32_t multiboot2_magic;
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uint32_t multiboot2_boot_info_size;
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bool multiboot2_init(uint32_t info_addr) {
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multiboot2_boot_info_addr = info_addr;
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uintptr_t *addr = (uintptr_t *) multiboot2_boot_info_addr;
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if (multiboot2_magic != MULTIBOOT2_BOOTLOADER_MAGIC)
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return false;
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// addr+0 处保存了大小
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multiboot2_boot_info_size = *(uint32_t *) addr;
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return true;
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}
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void multiboot2_iter(bool (*_fun)(const struct iter_data_t *, void *, uint32_t *),
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void *data, uint32_t *count) {
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uintptr_t addr = multiboot2_boot_info_addr;
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// 接下来的第8字节开始，为 tag 信息
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struct iter_data_t *tag = (struct iter_data_t *) ((void *) addr + 8);
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for (; tag->type != MULTIBOOT_TAG_TYPE_END;
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tag = (struct iter_data_t *) ((uint8_t *) tag + ALIGN_F(tag->size, 8))) {
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if (_fun(tag, data, count) == true) {
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return;
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}
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}
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return;
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}
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// 读取 grub2 传递的物理内存信息，保存到 e820map_t 结构体中
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// 一般而言是这样的
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// 地址(长度) 类型
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// 0x00(0x9F000) 0x1
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// 0x9F000(0x1000) 0x2
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// 0xE8000(0x18000) 0x2
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// 0x100000(0x7EF0000) 0x1
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// 0x7FF0000(0x10000) 0x3
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// 0xFFFC0000(0x40000) 0x2
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/**
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* @brief 获取multiboot2协议提供的内存区域信息
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*
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* @param _iter_data 要被迭代的信息的结构体
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* @param _data 返回信息的结构体指针
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* @param count 返回数组的长度
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* @return true
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* @return false
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*/
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bool multiboot2_get_memory(const struct iter_data_t *_iter_data, void *data, uint32_t *count) {
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if (_iter_data->type != MULTIBOOT_TAG_TYPE_MMAP)
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return false;
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struct multiboot_mmap_entry_t *resource = (struct multiboot_mmap_entry_t *) data;
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struct multiboot_mmap_entry_t *mmap = ((struct multiboot_tag_mmap_t *) _iter_data)->entries;
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*count = 0;
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for (; (uint8_t *) mmap < (uint8_t *) _iter_data + _iter_data->size;
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mmap = (struct multiboot_mmap_entry_t *) ((uint8_t *) mmap +
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((struct multiboot_tag_mmap_t *) _iter_data)->entry_size)) {
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*resource = *mmap;
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// 将指针进行增加
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resource = (struct multiboot_mmap_entry_t *) ((uint8_t *) resource +
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((struct multiboot_tag_mmap_t *) _iter_data)->entry_size);
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++(*count);
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}
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return true;
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}
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/**
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* @brief 获取VBE信息
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*
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* @param _iter_data 要被迭代的信息的结构体
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* @param _data 返回信息的结构体指针
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*/
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bool multiboot2_get_VBE_info(const struct iter_data_t *_iter_data, void *data, uint32_t *reserved) {
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if (_iter_data->type != MULTIBOOT_TAG_TYPE_VBE)
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return false;
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*(struct multiboot_tag_vbe_t *) data = *(struct multiboot_tag_vbe_t *) _iter_data;
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return true;
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}
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/**
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* @brief 获取帧缓冲区信息
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*
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* @param _iter_data 要被迭代的信息的结构体
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* @param _data 返回信息的结构体指针
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*/
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bool multiboot2_get_Framebuffer_info(const struct iter_data_t *_iter_data, void *data, uint32_t *reserved) {
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if (_iter_data->type != MULTIBOOT_TAG_TYPE_FRAMEBUFFER)
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return false;
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*(struct multiboot_tag_framebuffer_info_t *) data = *(struct multiboot_tag_framebuffer_info_t *) _iter_data;
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return true;
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}
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