arm64: fix: a fully arm64 firmware + important fixes and patches.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

5 files changed, 30 insertions, 32 deletions

diff --git a/src/arm64/arm64-boot.S b/src/arm64/arm64-boot.S
index bcbec0e..4fbd3f8 100644
--- a/src/arm64/arm64-boot.S
+++ b/src/arm64/arm64-boot.S
@@ -1,15 +1,14 @@
 /* -------------------------------------------
 
-    Copyright (C) 2024, Amlal EL Mahrouss, all rights reserved.
+    Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
 
 ------------------------------------------- */
 
-.text
-
-.balign 4
+.section .text
 .global cb_reset_vector
-
 cb_reset_vector:
-	ldr sp, =__cb_stack_end
-	/* don't care about page_zero, it's gonna be a raw binary */
-    b cb_start_exec
+    ldr x0, =0x40080000
+    mov sp, x0         
+    b cb_start_exec         
+
+
diff --git a/src/arm64/arm64-start-context.S b/src/arm64/arm64-start-context.S
index 5db92d0..5a2539b 100644
--- a/src/arm64/arm64-start-context.S
+++ b/src/arm64/arm64-start-context.S
@@ -11,7 +11,6 @@
 
 cb_start_context:
     bl cb_start_context
-    ldr pc, [lr]
 
 cb_boot_processor_ready:
-    ldr pc, [lr]
+    bl cb_boot_processor_ready
diff --git a/src/arm64/arm64-uart.c b/src/arm64/arm64-uart.c
index 362fc24..7455626 100644
--- a/src/arm64/arm64-uart.c
+++ b/src/arm64/arm64-uart.c
@@ -21,12 +21,11 @@ static boolean cb_locked_put_char = no;
 /// @brief Retrieve character from cb_uart_ptr
 utf_char_t cb_get_char(void)
 {
-	// check if ready.
 	while ((ARM64_MMIO_REG(0x018) & (1 << 4)))
 	{
 	}
 
-	return (utf_char_t)ARM64_MMIO_REG(0x0);
+	return (utf_char_t)ARM64_MMIO_REG(0x0) & 0xFF;
 }
 
 void cb_put_char(utf_char_t ch)
diff --git a/src/arm64/makefile b/src/arm64/makefile
index 19f88f5..7aa0ae4 100644
--- a/src/arm64/makefile
+++ b/src/arm64/makefile
@@ -8,10 +8,12 @@
  # 	========================================================
  #
 
-CC=arm-none-eabi-gcc
-AS=arm-none-eabi-as
+CC=aarch64-elf-gcc
+AS=aarch64-elf-as
 
+COREBOOT=core-boot.elf
 FIRMWARE=boot.rom
+STAGE2=bootstg2.rom
 
 FLAGS=-c -D__COMPILE_ARM64__ -I../../ -Wall -c -nostdlib -ffreestanding -fno-builtin \
 		-D__BSTRICT__ -D__BDEBUG__
@@ -20,13 +22,13 @@ C_SRC=$(wildcard *.c) $(wildcard ../*.c) -c
 
 AS_FLAGS= -c -I../../
 
-LD=arm-none-eabi-ld
+LD=aarch64-elf-ld
 OBJ=*.o
 FLAGS_LD= --script=script.lds -o core-boot.elf -nostdlib
+OBJCOPY=aarch64-elf-objcopy
 
-EMU=qemu-system-arm
-EMU_FLAGS=-M virt -cpu cortex-a15 -kernel $(FIRMWARE) -s \
-			-drive file=bootstg2.rom,format=raw
+EMU=qemu-system-aarch64
+EMU_FLAGS=-M virt -cpu cortex-a57 -bios $(FIRMWARE) -m 256M -d int -smp 2
 
 WAIT=sleep 1
 
@@ -41,16 +43,15 @@ firmware-link: firmware-compile
 .PHONY: rom
 rom:
 	qemu-img create -f qcow2 epm.img 256M
-	qemu-img create -f raw boot.rom 512K
 	qemu-img create -f raw bootstg2.rom 64M
-	dd if=core-boot.elf of=boot.rom bs=1 seek=0 conv=notrunc
+	$(OBJCOPY) --strip-all -O binary $(COREBOOT) $(FIRMWARE)
 
 # compile firmware
 .PHONY: firmware-compile
 firmware-compile:
 	$(CC) $(FLAGS) $(C_SRC)
-	$(AS) -march=armv7-a -mcpu=cortex-a15 arm64-start-context.S -o arm64-start-context.o
-	$(AS) -march=armv7-a -mcpu=cortex-a15 arm64-boot.S -o arm64-boot.o
+	$(AS) arm64-start-context.S -o arm64-start-context.o
+	$(AS) arm64-boot.S -o arm64-boot.o
 	
 
 # launch qemu rule
@@ -61,7 +62,7 @@ run:
 # launch qemu with attached debugger
 .PHONY: run-dbg
 run-dbg:
-	$(EMU) $(EMU_FLAGS)
+	$(EMU) -s -S $(EMU_FLAGS)
 
 # remove object files
 .PHONY: clean
diff --git a/src/arm64/script.lds b/src/arm64/script.lds
index b8a0d11..6daad64 100644
--- a/src/arm64/script.lds
+++ b/src/arm64/script.lds
@@ -1,14 +1,14 @@
 ENTRY(cb_reset_vector)
+
 SECTIONS
 {
-  . = 0x40100000;
+    . = 0x00000000;
 
-  .text : { *(.text) }
-  .data : { *(.data) }
-  .bss : { *(.bss COMMON) }
-  . = ALIGN(8);
-  . = . + 0x1000; /* 4kB of stack memory */
-  __cb_stack_end = .;
+    .text : {
+        *(.text*)
+    }
 
-  PROVIDE(cb_memory_end = .);
-}
+    .bss : {
+        *(.bss*)
+    }
+}
\ No newline at end of file