Macintosh-SW
/
powerpc-ofw-boot
mirror of https://github.com/thamugadi/powerpc-ofw-boot.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

24-bit VGA

This commit is contained in:
thamugadi 2021-10-10 19:11:29 +01:00
parent fd5d151853
commit cf12e548eb
4 changed files with 29 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Makefile
View File

@ -1,3 +1,4 @@
MACHINE=mac99
PPC=powerpc-linux-gnu
QEMU=qemu-system-ppc
DISK.APM: kernel.elf bootinfo.txt scripts/kpartx.sh
@ -24,8 +25,8 @@ start.elf: entry/start.s
clean:
rm *.APM *elf *txt
run:
$(QEMU) *.APM -g 1024x768x32
$(QEMU) *.APM -g 1280x768x32 -machine $(MACHINE)
debug:
$(QEMU) *.APM -d in_asm -g 1024x768x32
$(QEMU) *.APM -d in_asm -g 1280x768x32 -machine $(MACHINE)
all:
make clean && make && make run

48
entry/boot.c
View File

@ -1,16 +1,18 @@
#define beige 0xBE
#define mac99 0x5A
#define __VRAM__BEIGE 0x80000000
#define __VRAM__MAC99 0x81000000
#define __BIOS__BEIGE 0xFFC00000
#define __BIOS__MAC99 0xFFF00000
#define beige 0xBE
#define mac99 0x5A
#define __VRAM__BEIGE 0x80000000
#define __BIOS__BEIGE 0xFFC00000
unsigned char IO_TYPE;
#define __VRAM__MAC99 0x81000000
#define __BIOS__MAC99 0XFFF00000
#define __USB_KEYBOARD__MAC99 0x80080038
#define __USB_MOUSE__MAC99 0x8008003C
unsigned char IO_TYPE;
unsigned char* p_vram;
unsigned char* p_bios;
void get_io_type(void)
{
if (*(unsigned char*)__VRAM__BEIGE == beige) IO_TYPE = beige;
@ -21,9 +23,7 @@ void init(void)
{
if (IO_TYPE == beige)
{
p_vram = __VRAM__BEIGE;
p_bios = __BIOS__BEIGE;
for(;;); // unsupported yet.
}
else if (IO_TYPE == mac99)
{
@ -36,29 +36,23 @@ void main(void)
{
get_io_type();
init();
clearscreen(0xAA,0xBB);
clearscreen(100,85,100, 0x100000);
for(;;);
}
void clearscreen(unsigned char a, unsigned char b)
void clearscreen(unsigned char a, unsigned char b, unsigned char c, int n)
{
init();
for (unsigned int i = 0; i<0x100000; i++)
for (unsigned int i = 0; i<n; i++)
{
*p_vram = a;
//24-bit VGA
*p_vram = 0;
p_vram++;
*p_vram = b;
*p_vram = a;
p_vram++;
*p_vram = b;
p_vram++;
*p_vram = c;
p_vram++;
}
}
void noisescreen(void)
{
init();
for (unsigned int i = 0; i<0x200000; i++)
{
*p_vram = *(p_bios+0x2F0000+i);
p_vram++;
}
}

1
entry/start.s
View File

@ -1,4 +1,3 @@
.globl _start
_start:
li 1, 0xac
b main

9
loader/load.fth
View File

@ -8,14 +8,15 @@
: fba frame-buffer-adr ;
: beige-vram 80000000 ; : mac99-vram 81000000 ;
: beige-error ." G3 Beige machine isn't supported yet. Please run it with a post-1999 PowerPC Mac." ;
variable run
-1 run !
fba beige-vram = if ." Beige" cr 100 0 do 0BE i beige-vram + c! loop then
fba mac99-vram = if ." mac99" cr 100 0 do 05A i mac99-vram + c! loop then
fba beige-vram = if beige-error cr 100 0 do 0BE i beige-vram + c! loop then
fba mac99-vram = if ." mac99" cr 100 0 do 05A i mac99-vram + c! loop then
fba beige-vram diff fba mac99-vram diff and if ." Hardware not supported." cr 0 run ! then
fba 100 dump
run @ 0 = if 1 0 do 0 +loop then
boot hd:,\boot\kernel.elf