build: CMake toolchain for Kernel

build: moved CMake toolchain for Bootloader from Source folder to root of Bootloader

Bootloader/justfile

@@ -2,7 +2,7 @@ BUILD_DIR := env_var_or_default("BUILD_DIR", justfile_directory() + "/.build")
 TEMP_DIR := env_var_or_default("TEMP_DIR", BUILD_DIR + "/temp")
 build:
     cmake -B {{TEMP_DIR}}/Bootloader -S . \
-          -DCMAKE_TOOLCHAIN_FILE=Source/cmake/aarch64-uefi.cmake \
+          -DCMAKE_TOOLCHAIN_FILE=cmake/aarch64-uefi.cmake \
           -DCMAKE_BUILD_TYPE=Release
 
     cmake --build {{TEMP_DIR}}/Bootloader

Kernel/CMakeLists.txt

@@ -1,21 +1,10 @@
 cmake_minimum_required(VERSION 3.10)
-project(MyShittyKernel LANGUAGES ASM C)
+project(ksOSKernel LANGUAGES ASM C)
 
-if(NOT LLVM_BIN)
-    execute_process(COMMAND brew --prefix llvm OUTPUT_VARIABLE LLVM_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
-    set(LLVM_BIN "${LLVM_PREFIX}/bin")
-endif()
-
-set(CMAKE_C_COMPILER "${LLVM_BIN}/clang")
-set(CMAKE_ASM_COMPILER "${LLVM_BIN}/clang")
-set(LLVM_OBJCOPY "${LLVM_BIN}/llvm-objcopy")
-
-set(TARGET_TRIPLE aarch64-none-elf)
-add_compile_options(--target=${TARGET_TRIPLE} -ffreestanding -nostdlib -O0 -g)
+add_compile_options(-ffreestanding -nostdlib -O0 -g)
 
 set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
 add_link_options(
-    --target=${TARGET_TRIPLE}
     -fuse-ld=lld
     -nostdlib
     -static
@@ -23,7 +12,6 @@ add_link_options(
 )
 
 add_executable(kernel.elf Source/entry.S)
-
 add_custom_command(TARGET kernel.elf POST_BUILD
     COMMAND ${LLVM_OBJCOPY} -O binary kernel.elf kernel.bin
     COMMENT "kernel.elf -> kernel.bin"

Kernel/Source/entry.S

@@ -2,20 +2,58 @@
 .global _start
 
 _start:
-    add x1, x0, #64         // x1 = BIFramebuffer
-    ldr x2, [x1]            // x2 = base
-    ldr x3, [x1, #16]       // x3 = width
-    ldr x4, [x1, #24]       // x4 = height
+    add x1, x0, #64
+    ldr x2, [x1]            // base
+    ldr x3, [x1, #16]       // width
+    ldr x4, [x1, #24]       // height
     
     mul x5, x3, x4 
+    mov x7, #5
+    udiv x10, x5, x7        // stripe size
 
-    mov w6, #0x00FF00
-    movk w6, #0x0000, lsl #16 
+    // 0x00RRGGBB
+    // lblue: 5B CE FA
+    mov w11, #0xCEFA
+    movk w11, #0x5B, lsl #16
+    
+    // pink: F5 A7 B8
+    mov w12, #0xA7B8
+    movk w12, #0xF5, lsl #16
+    
+    // white: FF FF FF
+    mov w13, #0xFFFF
+    movk w13, #0xFF, lsl #16
+
+    mov x14, #0             // pixels in curr stripe
+    mov x15, #0             // stripe index
 
 fill_loop:
     cbz x5, done
+
+    cmp x15, #0
+    b.eq set_blue
+    cmp x15, #1
+    b.eq set_pink
+    cmp x15, #2
+    b.eq set_white
+    cmp x15, #3
+    b.eq set_pink
+    b set_blue
+
+set_blue:  mov w6, w11; b draw
+set_pink:  mov w6, w12; b draw
+set_white: mov w6, w13
+
+draw:
     str w6, [x2], #4
     sub x5, x5, #1
+    add x14, x14, #1
+
+    cmp x14, x10
+    b.lt fill_loop
+    
+    mov x14, #0
+    add x15, x15, #1
     b fill_loop
 
 done:

Kernel/cmake/aarch64-bare.cmake

@@ -0,0 +1,16 @@
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+if(NOT LLVM_BIN)
+    execute_process(COMMAND brew --prefix llvm OUTPUT_VARIABLE LLVM_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(LLVM_BIN "${LLVM_PREFIX}/bin")
+endif()
+
+set(CMAKE_C_COMPILER "${LLVM_BIN}/clang")
+set(CMAKE_ASM_COMPILER "${LLVM_BIN}/clang")
+set(LLVM_OBJCOPY "${LLVM_BIN}/llvm-objcopy")
+
+set(TARGET_TRIPLE aarch64-none-elf)
+set(CMAKE_C_COMPILER_TARGET ${TARGET_TRIPLE})
+set(CMAKE_ASM_COMPILER_TARGET ${TARGET_TRIPLE})

Kernel/justfile

@@ -1,7 +1,8 @@
 BUILD_DIR := env_var_or_default("BUILD_DIR", justfile_directory() + "/.build") 
 TEMP_DIR := env_var_or_default("TEMP_DIR", BUILD_DIR + "/temp")
 build:
-    cmake -B {{TEMP_DIR}}/Kernel -S .
+    cmake -B {{TEMP_DIR}}/Kernel -S . \
+        -DCMAKE_TOOLCHAIN_FILE=cmake/aarch64-bare.cmake
 
     cmake --build {{TEMP_DIR}}/Kernel