添加early ioremap支持 (#492)

* 使用early io remap来映射早期的vesa缓冲区

kernel/src/driver/video/fbdev/vesafb.rs

@@ -38,6 +38,7 @@ use crate::{
     },
     include::bindings::bindings::{
         multiboot2_get_Framebuffer_info, multiboot2_iter, multiboot_tag_framebuffer_info_t,
+        FRAME_BUFFER_MAPPING_OFFSET,
     },
     init::{boot_params, initcall::INITCALL_DEVICE},
     libs::{
@@ -650,7 +651,11 @@ pub fn vesafb_early_init() -> Result<VirtAddr, SystemError> {
     boottime_screen_info.lfb_size =
         (width * height * ((fb_info.framebuffer_bpp as u32 + 7) / 8)) as usize;
 
-    let buf_vaddr = VirtAddr::new(0xffff800003200000);
+    // let buf_vaddr = VirtAddr::new(0xffff800003200000);
+    let buf_vaddr = VirtAddr::new(
+        crate::include::bindings::bindings::SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE as usize
+            + FRAME_BUFFER_MAPPING_OFFSET as usize,
+    );
     boottime_screen_info.lfb_virt_base = Some(buf_vaddr);
 
     let init_text = "Video driver to map.\n\0";

kernel/src/driver/video/mod.rs

@@ -3,9 +3,6 @@ use core::sync::atomic::{AtomicBool, Ordering};
 use crate::{
     arch::MMArch,
     driver::tty::serial::serial8250::send_to_default_serial8250_port,
-    include::bindings::bindings::{
-        FRAME_BUFFER_MAPPING_OFFSET, SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE,
-    },
     init::boot_params,
     kinfo,
     libs::{
@@ -16,7 +13,7 @@ use crate::{
     },
     mm::{
         allocator::page_frame::PageFrameCount, kernel_mapper::KernelMapper, page::PageFlags,
-        MemoryManagementArch, VirtAddr,
+        MemoryManagementArch,
     },
     time::timer::{Timer, TimerFunction},
 };
@@ -86,10 +83,11 @@ impl VideoRefreshManager {
      */
     fn init_frame_buffer(&self) {
         kinfo!("Re-mapping VBE frame buffer...");
-        let buf_vaddr = VirtAddr::new(
-            SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE as usize + FRAME_BUFFER_MAPPING_OFFSET as usize,
-        );
-        boot_params().write_irqsave().screen_info.lfb_virt_base = Some(buf_vaddr);
+        let buf_vaddr = boot_params()
+            .read_irqsave()
+            .screen_info
+            .lfb_virt_base
+            .unwrap();
 
         let mut frame_buffer_info_guard = self.device_buffer.write();
         if let ScmBuffer::DeviceBuffer(vaddr) = &mut (frame_buffer_info_guard).buf {