From 64ce7b85586b85f39e009bb294c6c4c4782d1753 Mon Sep 17 00:00:00 2001
From: Robin Krens <robin@robinkrens.nl>
Date: Thu, 9 Jun 2022 00:03:11 +0200
Subject: [PATCH] out call to ports with inline asm + c variables
squash of:
commit 0b368932d654cdbd81d682d36897c74fa1106485
commit a58ede133445902c0a13da0392cac600e72538bf
---
Makefile | 4 +++-
src/entry.S | 2 +-
src/main.c | 20 +++++++++++++++++++-
3 files changed, 23 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index f949274..5ee33f7 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,9 @@ ADIR = objs
SDIR = src
INC = -Iinc
-CFLAGS = -march=v30 -ffreestanding # use NEC v30 chip
+CFLAGS = -march=v30# use NEC v30 chip
+CFLAGS += -ffreestanding# no stdlib
+CFLAGS += -fno-pic# for use of inline asm
_OBJS = entry.o main.o # todo: make sure entry is forced as entry point for linker
diff --git a/src/entry.S b/src/entry.S
index e1393e5..e5fae8b 100644
--- a/src/entry.S
+++ b/src/entry.S
@@ -22,7 +22,7 @@ _start:
mov %ax,%bx
mov %ax,%bp
mov %ax,%ss
-
+
# set stack pointer for wonderswan
# color
mov $0xFE00 - 2,%ax
diff --git a/src/main.c b/src/main.c
index 502d63c..dc651f1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -18,13 +18,27 @@ unsigned char bgtile_pal[] = {
unsigned char lol[5] = { 0xAA, 0x2, 0x3, 0x4, 0x5};
unsigned char lol2[5] = { 0x1, 0x2, 0x3, 0x4, 0x5};
unsigned char lol3[5] = { 0x1, 0x2, 0x3, 0x4, 0x5};
-#define PALETTE (*(volatile unsigned *)0xFE00)
#define PALETTE_T (volatile unsigned *)0xFE00
#define SPRITE_T (volatile unsigned *)0x4000
/* bss */
static unsigned char blaat[100];
+void outport(unsigned char portnr, unsigned char val)
+{
+ __asm__(
+ "mov %1, %%dl\n\t"
+ "out %0, (%%dx)"
+ :
+ :"r"(val), "r"(portnr)
+ :);
+}
+
+void init_video(void)
+{
+
+}
+
int main(void)
{
lol[0] = 0xDD;
@@ -33,6 +47,10 @@ int main(void)
blaat[0] = 0xEE;
blaat[1] = 0xEE;
blaat[32] = 0xEE;
+
+ init_video();
+ outport(0x15, 0xEE);
+ while(1);
unsigned char * ptr = PALETTE_T;
for (int i = 0; i < sizeof(bgtile_pal); ++i) {
--
2.7.4