1 files changed, 60 insertions, 0 deletions
diff --git a/dev/boot/src/HEL/AMD64/BootAPI.S b/dev/boot/src/HEL/AMD64/BootAPI.S
new file mode 100644
index 00000000..963ef46a
--- /dev/null
+++ b/dev/boot/src/HEL/AMD64/BootAPI.S
@@ -0,0 +1,60 @@
+.global rt_jump_to_address
+.global rt_reset_hardware
+
+.text
+
+.intel_syntax noprefix
+
+/**
+ @brief this function setups a stack and then jumps to
+ a function */
+rt_jump_to_address:
+    mov rbx, rcx
+    mov rcx, rdx
+    push rbx
+    push rdx
+    mov rsp, r8
+    push rax
+    jmp rbx
+
+    pop rdx
+    pop rbx
+    pop rax
+
+    ret
+
+rt_reset_hardware:
+    /* dont raise any interrupts. (except ofc NMIs.) */
+    cli
+    /* remap PIC */
+wait_gate1:
+    in al,0x64
+    and al,2
+    jnz wait_gate1
+    mov al,0x0D1
+    out 0x64,al
+wait_gate2:
+    in al,0x64
+    and al,2
+    jnz wait_gate2
+    mov al,0x0FE
+    out 0x60,al
+
+    /* trigger triple fault, by writing to cr4 */
+
+    mov rax, 0
+    lidt [rax]
+
+reset_wait:
+    jmp reset_wait
+
+.global boot_write_cr3
+.global boot_read_cr3
+
+boot_read_cr3:
+    mov rax, rax
+    ret
+
+boot_write_cr3:
+    mov cr3, rcx
+    ret