Implement UEFI functionality in Forth

[rrq/jonasforth.git] / main.asm

diff --git a/main.asm b/main.asm
index 407d3a30a9baad7bbd6b05b9818d50d29cf889b6..5f63d849b92f156a1a66e0e3b7fa1819c35280ac 100644 (file)
--- a/main.asm
+++ b/main.asm
@@ -1,10 +1,5 @@
-;; vim: syntax=fasm
-
-;; At compile-time we load the module given by the environment variable
-;; OS_INCLUDE. This module should define the following macros:
-;;
-;; Each of these functions should preserve the value of RSI and RSP. They may
-;; use other registers as they like.
+;; The UEFI module defines the following functions. Each of these functions
+;; preserve the value of RSI and RSP. They may use other registers as they like.
 ;;
 ;; os_initialize
 ;;   Called at initialization.
@@ -19,7 +14,7 @@
 ;;
 ;; os_terminate
 ;;   Shut down the system, returning the error code given in RAX.
-include '%OS_INCLUDE%'
+include 'os/uefi.asm'
 
 ;; The code in this macro is placed at the end of each Forth word. When we are
 ;; executing a definition, this code is what causes execution to resume at the
@@ -582,6 +577,69 @@ forth MAIN, 'MAIN'
   dq BRANCH, -8 * 2
   dq TERMINATE
 
+;; EFI:
+
+forth EFI_SYSTEM_TABLE_CONSTANT, 'SystemTable'
+  dq LIT, system_table, GET
+  dq EXIT
+
+forth_asm EFICALL2, 'EFICALL2'
+  pop rax ; function pointer
+  pop rdx ; 2nd argument
+  pop rcx ; 1st argument
+
+  sub rsp, 32
+  call rax
+  add rsp, 32
+
+  next
+
+forth_asm EFICALL3, 'EFICALL3'
+  pop rax ; function pointer
+  pop r8  ; 3rd argument
+  pop rdx ; 2nd argument
+  pop rcx ; 1st argument
+
+  sub rsp, 32
+  call rax
+  add rsp, 32
+
+  push rax
+
+  next
+
+forth_asm EFICALL10, 'EFICALL10'
+  pop rax ; function pointer
+
+  mov rcx, [rsp + 8 * 9]
+  mov rdx, [rsp + 8 * 8]
+  mov r8, [rsp + 8 * 7]
+  mov r9, [rsp + 8 * 6]
+
+  ;; Reverse order of stack arguments
+  mov r10, [rsp + 8 * 5]
+  mov r11, [rsp + 8 * 0]
+  mov [rsp + 8 * 5], r11
+  mov [rsp + 8 * 0], r10
+
+  mov r10, [rsp + 8 * 4]
+  mov r11, [rsp + 8 * 1]
+  mov [rsp + 8 * 4], r11
+  mov [rsp + 8 * 1], r10
+
+  mov r10, [rsp + 8 * 3]
+  mov r11, [rsp + 8 * 2]
+  mov [rsp + 8 * 3], r11
+  mov [rsp + 8 * 2], r10
+
+  sub rsp, 32
+  call rax
+  add rsp, 32 + 8 * 10
+
+  push rax
+
+  next
+
 ;; Built-in variables:
 
 forth STATE, 'STATE'
@@ -657,6 +715,8 @@ return_stack_top:
 ;; We store some Forth code in sys.f that defined common words that the user
 ;; would expect to have available at startup. To execute these words, we just
 ;; include the file directly in the binary, and then interpret it at startup.
-sysf file 'sys.f'
+sysf:
+file 'sys.f'
+file 'uefi.f'
 sysf.len = $ - sysf