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Author: mkroening

Cargo.lock

@@ -33,6 +33,8 @@ sbi-rt = "0.0.3"
 [target.'cfg(target_arch = "x86_64")'.dependencies]
 linux-boot-params = { version = "0.17", optional = true }
 multiboot = { version = "0.8", optional = true }
+# xen-hvm = { path = "../xen/xen-hvm" }
+xen-hvm = { git = "https://github.com/hermit-os/xen.git", branch = "xen-hvm" }
 uart_16550 = "0.4"
 x86_64 = { version = "0.15", default-features = false, features = ["instructions"] }
 
@@ -46,7 +48,7 @@ built = { version = "0.8", features = ["git2", "chrono"] }
 # FIXME: When target-specific features exist, remove the workaround features.
 # https://github.com/rust-lang/cargo/issues/1197
 [features]
-default = []
+default = ["multiboot"]
 elf = []
 linux = []
 multiboot = []

Cargo.toml

@@ -8,30 +8,11 @@
 .extern loader_start		# defined in linker script
 .extern loader_end
 
-# We use a special name to map this section at the begin of our kernel
-# =>  Multiboot expects its magic number at the beginning of the kernel.
-.section .mboot, "a"
-
-# This part MUST be 4 byte aligned, so we solve that issue using '.align 4'.
-.align 4
-mboot:
-    # Multiboot macros to make a few lines more readable later
-    .set MULTIBOOT_PAGE_ALIGN,    (1 << 0)
-    .set MULTIBOOT_MEMORY_INFO,   (1 << 1)
-    .set MULTIBOOT_HEADER_MAGIC,  0x1BADB002
-    .set MULTIBOOT_HEADER_FLAGS,  MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO
-    .set MULTIBOOT_CHECKSUM,      -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
-
-    # This is the GRUB Multiboot header. A boot signature
-    .4byte MULTIBOOT_HEADER_MAGIC
-    .4byte MULTIBOOT_HEADER_FLAGS
-    .4byte MULTIBOOT_CHECKSUM
-    .4byte 0, 0, 0, 0, 0 # address fields
-
 .section .text
 .align 4
 .global _start
 _start:
+    mov edi, ebx
     cli # avoid any interrupt
 
     # Initialize stack pointer

src/arch/x86_64/platform/multiboot/entry.s

@@ -2,6 +2,7 @@ use alloc::borrow::ToOwned;
 use core::ptr::write_bytes;
 use core::sync::atomic::{AtomicPtr, Ordering};
 use core::{mem, ptr, slice};
+use xen_hvm::start_info::StartInfo;
 
 use align_address::Align;
 use hermit_entry::boot_info::{
@@ -18,6 +19,12 @@ use crate::arch::x86_64::physicalmem::PhysAlloc;
 use crate::arch::x86_64::{KERNEL_STACK_SIZE, SERIAL_IO_PORT, paging};
 use crate::fdt::Fdt;
 
+unsafe extern "C" {
+	fn _start(start_info: &'static StartInfo) -> !;
+}
+
+xen_hvm::phys32_entry!(_start);
+
 unsafe extern "C" {
 	static mut loader_end: u8;
 }
@@ -38,9 +45,13 @@ mod entry {
 
 static MB_INFO: AtomicPtr<MultibootInfo> = AtomicPtr::new(ptr::null_mut());
 
-unsafe extern "C" fn rust_start(mb_info: *mut MultibootInfo) -> ! {
+unsafe extern "C" fn rust_start(start_info: &'static StartInfo) -> ! {
 	crate::log::init();
-	MB_INFO.store(mb_info, Ordering::Relaxed);
+
+	paging::map::<Size4KiB>(0x2000, 0x2000, 1, PageTableFlags::empty());
+	dbg!(start_info);
+	loop {}
+
 	unsafe {
 		crate::os::loader_main();
 	}

src/arch/x86_64/platform/multiboot/mod.rs

@@ -40,10 +40,10 @@ impl Build {
 		sh.create_dir(dist_object.as_ref().parent().unwrap())?;
 		sh.copy_file(&build_object, &dist_object)?;
 
-		if self.artifact.target == Target::X86_64Multiboot {
-			eprintln!("Converting object to elf32-i386");
-			dist_object.convert_to_elf32_i386()?;
-		}
+		// if self.artifact.target == Target::X86_64Multiboot {
+		// 	eprintln!("Converting object to elf32-i386");
+		// 	dist_object.convert_to_elf32_i386()?;
+		// }
 
 		eprintln!("Loader available at {}", dist_object.as_ref().display());
 		Ok(())