initial commit

bootloader/Start.S

@@ -0,0 +1,56 @@
+.section ".text.boot"
+
+.global _start
+
+_start:
+	mrs x1, mpidr_el1
+	and x1, x1, #3
+	cbz x1, run
+	
+wait:
+	wfe
+	b wait
+
+run:
+	mov x20, x0
+	adr x0, _start
+	mov sp, x0
+
+	adr x0, __text_start
+	ldr x1, =__new_text_start
+	cmp x0, x1
+	b.gt relocate
+
+	adr x0, __bss_start
+	adr x1, __bss_end
+	bl memzero
+
+	mov x0, x20
+	bl main
+	b wait
+
+relocate:
+	// move text section
+	ldr x0, =__new_text_start
+	adr x1, __text_start
+	adr x2, __text_end
+	sub x2, x2, x1
+	bl memcpy
+	mov x19, x0
+
+	// move rodata section
+	ldr x0, =__new_ro_start
+	adr x1, __rodata_start
+	adr x2, __rodata_end
+	sub x2, x2, x1
+	bl memcpy
+	
+	// move data section
+	ldr x0, =__new_data_start
+	adr x1, __data_start
+	adr x2, __data_end
+	sub x2, x2, x1
+	bl memcpy
+
+	br x19
+	b wait