out call to ports with inline asm + c variables

squash of:
commit 0b368932d654cdbd81d682d36897c74fa1106485
commit a58ede133445902c0a13da0392cac600e72538bf

diff --git a/Makefile b/Makefile
index f949274..5ee33f7 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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) {