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https://github.com/DragonOS-Community/DragonOS.git
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101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
#include "multiboot2.h"
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#include "assert.h"
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#include "../../common/glib.h"
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uintptr_t boot_info_addr;
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unsigned int multiboot2_magic;
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unsigned int boot_info_size;
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bool multiboot2_init(void)
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{
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uintptr_t *addr = (uintptr_t*)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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boot_info_size = *(unsigned int *)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 *, unsigned int *),
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void *data, unsigned int *count)
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{
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uintptr_t addr = boot_info_addr;
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// 下一字节开始为 tag 信息
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struct iter_data_t *tag = (struct iter_data_t *)(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(tag->size, 8)))
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{
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if (_fun(tag, data, count) == true)
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{
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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, unsigned int *count)
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{
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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 + ((struct multiboot_tag_mmap_t *)_iter_data)->entry_size))
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{
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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 + ((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, unsigned int *reserved)
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{
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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, unsigned int *reserved)
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{
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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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} |