Fix compilation and generally improve things

This project hasn't had a commit in awhile, so this is more of a messy
sweep-up job than anything else.
Months of negligence on a "nightly" versioned project leads to several
compilation failures, which have now been fixed. These include the
merging of `collections` and `alloc` crates. The change of the `Unique`
struct. And a new target option has been added, which made cross cross
compilation fail.
There have been also several general improvements. These include the new
use of the `x86_64` crate, instead of x86, which simplifies code (but
also requires a quite larger stack). This enables interrupt handling to
be greatly simplified when paired with the new "x86-interrupt" abi. Also
there is a small change to printing that allows for waiting for the
writer to flush. This is very useful for color switching.
Finally there have been a few minor changes, including changing the name
of the ugly `(ARCH)-unknown-none-gnu` to `(ARCH)-ESALP`. And a small
.gdbinit file has been added which should simplify debugging with qemu.

Many of these changes are better shown my themselves in Blog-OS. Please
see phil-opp/blog_os#289 phil-opp/blog_os#325 and phil-opp/blog_os#333
for more details.

.gdbinit

@@ -0,0 +1,12 @@
+file ./build/kernel-x86_64.bin
+target remote localhost:1234
+set architecture i386:x86-64
+set disassembly-flavor intel
+
+display /i $pc
+
+define longfix
+    disconnect
+    set architecture i386:x86-64:intel
+    target remote localhost:1234
+end

Cargo.toml

@@ -10,6 +10,7 @@ once = "0.3.2"
 rlibc = "0.1.4"
 spin = "0.4.4"
 multiboot2 = "0.3.0"
+x86_64 = "0.1.2"
 
 [dependencies.hole_list_allocator]
 path = "libs/hole_list_allocator"
@@ -21,19 +22,5 @@ version = "0.2.1"
 [dependencies.log_buffer]
 git = "https://github.com/ESALP/rust-log_buffer"
 
-[dependencies.x86]
-default-features = false
-version = "0.7.1"
-
 [lib]
 crate-type = ["staticlib"]
-
-[profile]
-
-[profile.dev]
-panic = "abort"
-
-[profile.release]
-panic = "abort"
-
-[workspace]

Makefile

@@ -9,7 +9,7 @@
 
 arch ?= x86_64
 name ?= ESALP
-target ?= $(arch)-unknown-none-gnu
+target ?= $(arch)-ESALP
 rust_os := target/$(target)/debug/lib$(name).a
 kernel := build/kernel-$(arch).bin
 iso := build/os-$(arch).iso

Xargo.toml

@@ -0,0 +1,2 @@
+[target.x86_64-ESALP.dependencies]
+alloc = {}

libs/hole_list_allocator/src/lib.rs

@@ -17,7 +17,6 @@
 use spin::Mutex;
 use linked_list_allocator::Heap;
 
-#[macro_use]
 extern crate lazy_static;
 extern crate linked_list_allocator;
 extern crate spin;

src/arch/x86_64/boot.asm

@@ -351,5 +351,5 @@ kernel_table:
 ; undefined behavior.
 align 16
 stack_bottom:
-	resb 4096 * 2
+	resb 4096 * 6
 stack_top: