From 9e21256a9103dc92035bdef940b342522ea3efb3 Mon Sep 17 00:00:00 2001
From: Jonas Hvid <mail@johv.dk>
Date: Sun, 8 Mar 2020 14:39:22 +0100
Subject: [PATCH] Add notes about loading files from disk

---
 README.md     | 2 +-
 uefi/Makefile | 6 +++++-
 uefi/main.asm | 9 +++++++--
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 8d3d026..39b9eb6 100644
--- a/README.md
+++ b/README.md
@@ -286,10 +286,10 @@ Notable sections:
 * 7\. Services - Boot Services (140)
 * 8\. Services - Runtime Services (228)
 * 12\. Protocols - Console Support (429)
+* 13\. Protocols - Media Access (493)
 * Appendix B - Console (2201)
 * Appendix D - Status Codes (2211)
 
-
 ## Resources
 
 * [UEFI - OSDev Wiki](https://wiki.osdev.org/UEFI)
diff --git a/uefi/Makefile b/uefi/Makefile
index 1d55f08..aeff045 100644
--- a/uefi/Makefile
+++ b/uefi/Makefile
@@ -1,5 +1,5 @@
 .PHONY: qemu
-qemu: out/main OVMF_CODE.fd OVMF_VARS.fd
+qemu: out/main out/hello OVMF_CODE.fd OVMF_VARS.fd
 	# Based on https://wiki.osdev.org/UEFI#Emulation_with_QEMU_and_OVMF
 	qemu-system-x86_64 -cpu qemu64 \
 		-drive if=pflash,format=raw,unit=0,file=OVMF_CODE.fd,readonly=on \
@@ -18,6 +18,10 @@ out/main: main.asm
 	mkdir -p out
 	fasm $< out/main
 
+out/hello:
+	mkdir -p out
+	echo -e "Hello!\nThis is a test." > out/hello
+
 .PHONY: clean
 clean:
 	rm -f main
diff --git a/uefi/main.asm b/uefi/main.asm
index 62b81df..431a64c 100644
--- a/uefi/main.asm
+++ b/uefi/main.asm
@@ -11,8 +11,13 @@ entry main
 ;;       - This should allow the user to type in a string, and then feed the
 ;;         buffer to us one character at a time.
 ;;       - [ ] We want to show the user's input on the screen while reading
+;; - [ ] Read a file that was bundled with the program
+;;       - It looks like we can use EFI_LOAD_FILE_PROTOCOL.LoadFile() to load
+;;         a file into a buffer. In order to be able to use this, we need to
+;;         have some way of interpreting a static buffer instead of reading as
+;;         we go.
 
-;; #region Structs
+;; EFI struct definitions {{{
 
 EFI_NOT_READY = 0x8000_0000_0000_0000 or 6
 
@@ -65,7 +70,7 @@ struc EFI_INPUT_KEY {
 }
 struct EFI_INPUT_KEY
 
-;; #endregion
+;; }}}
 
 section '.text' code executable readable
 
-- 
2.39.2