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new approach for dos port

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This commit is contained in:
veclavtlica
2026-10-08 13:46:16 +03:00
parent dc594e5e82
commit b92458862e
6 changed files with 190 additions and 119 deletions
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Player/Display/display.h
+1 -1
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@@ -2,6 +2,6 @@
#define PLR_DISPLAY_H
__attribute__((used)) extern int plr_display_x11_main(int argc, char *argv[]);
extern int plr_display_dos_main(int argc, char *argv[]);
__attribute__((used)) extern int plr_display_dos_main(void);
#endif
Player/Display/dos.c
+126 -108
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@@ -7,146 +7,164 @@
#define MODE_VGA_320_200_8 0x13
#define MODE_VESA_640_480_8 0x101
/*
TODO: https://github.com/depp/elf2dos/blob/master/elf/elf.go
https://www.edm2.com/index.php/LX_-_Linear_eXecutable_Module_Format_Description
Do not use anything but Clang in the end.
*/
// 8-color VGA palette gradient, lighter shades of lavender to pink
#define COLOR_OFFSET 0x50
#define COLOR_NUM 8
#define COLOR_STEP (HEIGHT / COLOR_NUM)
/* https://wiki.osdev.org/VESA_Video_Modes */
_Packed struct VbeInfoBlock {
char VbeSignature[4]; // == "VESA"
uint16_t VbeVersion; // == 0x0300 for VBE 3.0
uint16_t OemStringPtr[2]; // isa vbeFarPtr
uint8_t Capabilities[4];
uint16_t VideoModePtr[2]; // isa vbeFarPtr
uint16_t TotalMemory; // as # of 64KB blocks
uint8_t Reserved[492];
};
// /* https://wiki.osdev.org/VESA_Video_Modes */
// _Packed struct VbeInfoBlock {
// char VbeSignature[4]; // == "VESA"
// uint16_t VbeVersion; // == 0x0300 for VBE 3.0
// uint16_t OemStringPtr[2]; // isa vbeFarPtr
// uint8_t Capabilities[4];
// uint16_t VideoModePtr[2]; // isa vbeFarPtr
// uint16_t TotalMemory; // as # of 64KB blocks
// uint8_t Reserved[492];
// };
_Packed struct ModeInfoBlock {
uint16_t
attributes; // deprecated, only bit 7 should be of interest to you, and it
// indicates the mode supports a linear frame buffer.
uint8_t window_a; // deprecated
uint8_t window_b; // deprecated
uint16_t granularity; // deprecated; used while calculating bank numbers
uint16_t window_size;
uint16_t segment_a;
uint16_t segment_b;
uint32_t win_func_ptr; // deprecated; used to switch banks from protected mode
// without returning to real mode
uint16_t pitch; // number of bytes per horizontal line
uint16_t width; // width in pixels
uint16_t height; // height in pixels
uint8_t w_char; // unused...
uint8_t y_char; // ...
uint8_t planes;
uint8_t bpp; // bits per pixel in this mode
uint8_t banks; // deprecated; total number of banks in this mode
uint8_t memory_model;
uint8_t bank_size; // deprecated; size of a bank, almost always 64 KB but may
// be 16 KB...
uint8_t image_pages;
uint8_t reserved0;
// _Packed struct ModeInfoBlock {
// uint16_t
// attributes; // deprecated, only bit 7 should be of interest to you, and
// it
// // indicates the mode supports a linear frame buffer.
// uint8_t window_a; // deprecated
// uint8_t window_b; // deprecated
// uint16_t granularity; // deprecated; used while calculating bank numbers
// uint16_t window_size;
// uint16_t segment_a;
// uint16_t segment_b;
// uint32_t win_func_ptr; // deprecated; used to switch banks from protected
// mode
// // without returning to real mode
// uint16_t pitch; // number of bytes per horizontal line
// uint16_t width; // width in pixels
// uint16_t height; // height in pixels
// uint8_t w_char; // unused...
// uint8_t y_char; // ...
// uint8_t planes;
// uint8_t bpp; // bits per pixel in this mode
// uint8_t banks; // deprecated; total number of banks in this mode
// uint8_t memory_model;
// uint8_t bank_size; // deprecated; size of a bank, almost always 64 KB but
// may
// // be 16 KB...
// uint8_t image_pages;
// uint8_t reserved0;
uint8_t red_mask;
uint8_t red_position;
uint8_t green_mask;
uint8_t green_position;
uint8_t blue_mask;
uint8_t blue_position;
uint8_t reserved_mask;
uint8_t reserved_position;
uint8_t direct_color_attributes;
// uint8_t red_mask;
// uint8_t red_position;
// uint8_t green_mask;
// uint8_t green_position;
// uint8_t blue_mask;
// uint8_t blue_position;
// uint8_t reserved_mask;
// uint8_t reserved_position;
// uint8_t direct_color_attributes;
uint32_t framebuffer; // physical address of the linear frame buffer; write
// here to draw to the screen
uint32_t off_screen_mem_off;
uint16_t off_screen_mem_size; // size of memory in the framebuffer but not
// being displayed on the screen
uint8_t reserved1[206];
};
// uint32_t framebuffer; // physical address of the linear frame buffer; write
// // here to draw to the screen
// uint32_t off_screen_mem_off;
// uint16_t off_screen_mem_size; // size of memory in the framebuffer but not
// // being displayed on the screen
// uint8_t reserved1[206];
// };
static char get_video_mode();
#pragma aux get_video_mode = "mov ah, 0x0f" \
"int 0x10" value[al] modify[ah];
// static char get_video_mode();
// #pragma aux get_video_mode = "mov ah, 0x0f" \
// "int 0x10" value[al] modify[ah];
static void set_video_mode(unsigned char);
#pragma aux set_video_mode = "mov ah, 0x00" \
"int 0x10" parm[al] modify[ah];
// static void set_video_mode(unsigned char);
// #pragma aux set_video_mode = "mov ah, 0x00" \
// "int 0x10" parm[al] modify[ah];
static void set_vesa_video_mode(unsigned short);
#pragma aux set_vesa_video_mode = "mov ax, 0x4f02" \
"int 0x10" parm[bx] modify[ah];
// static void set_vesa_video_mode(unsigned short);
// #pragma aux set_vesa_video_mode = "mov ax, 0x4f02" \
// "int 0x10" parm[bx] modify[ah];
static void wait_for_key();
#pragma aux wait_for_key = "mov ah, 0x00" \
"int 0x16" modify[ah];
// static void wait_for_key();
// #pragma aux wait_for_key = "mov ah, 0x00" \
// "int 0x16" modify[ah];
static short get_vesa_controller_info(struct VbeInfoBlock *);
#pragma aux get_vesa_controller_info = "mov ax, 0x4f00" \
"int 0x10" parm[es di] value[ax];
// static short get_vesa_controller_info(struct VbeInfoBlock *);
// #pragma aux get_vesa_controller_info = "mov ax, 0x4f00" \
// "int 0x10" parm[es di] value[ax];
static short get_vesa_mode_info(uint16_t mode, struct ModeInfoBlock *);
#pragma aux get_vesa_mode_info = "mov ax, 0x4F01" \
"int 0x10" parm[cx][es di] value[ax];
// static short get_vesa_mode_info(uint16_t mode, struct ModeInfoBlock *);
// #pragma aux get_vesa_mode_info = "mov ax, 0x4F01" \
// "int 0x10" parm[cx][es di] value[ax];
/* https://wiki.osdev.org/User:Omarrx024/VESA_Tutorial*/
static char *find_display_memory(void) {
struct VbeInfoBlock *ctrl = (struct VbeInfoBlock *)0x2000;
struct ModeInfoBlock *inf = (struct ModeInfoBlock *)0x3000;
uint16_t *modes;
int i;
// /* https://wiki.osdev.org/User:Omarrx024/VESA_Tutorial*/
// static char *find_display_memory(void) {
// struct VbeInfoBlock *ctrl = (struct VbeInfoBlock *)0x2000;
// struct ModeInfoBlock *inf = (struct ModeInfoBlock *)0x3000;
// uint16_t *modes;
// int i;
strncpy(ctrl->VbeSignature, "VBE2", 4);
if (get_vesa_controller_info(ctrl) != 0x004F)
return NULL;
// strncpy(ctrl->VbeSignature, "VBE2", 4);
// if (get_vesa_controller_info(ctrl) != 0x004F)
// return NULL;
modes = (uint16_t *)(ctrl->VideoModePtr);
for (i = 0; modes[i] != 0xFFFF; ++i) {
if (get_vesa_mode_info(modes[i], inf) != 0x004F)
continue;
// modes = (uint16_t *)(ctrl->VideoModePtr);
// for (i = 0; modes[i] != 0xFFFF; ++i) {
// if (get_vesa_mode_info(modes[i], inf) != 0x004F)
// continue;
// Check if this is a graphics mode with linear frame buffer support
if ((inf->attributes & 0x80) != 0x80)
continue;
// // Check if this is a graphics mode with linear frame buffer support
// if ((inf->attributes & 0x80) != 0x80)
// continue;
// Check if this is a packed pixel or direct color mode
if (inf->memory_model != 4 && inf->memory_model != 6)
continue;
// // Check if this is a packed pixel or direct color mode
// if (inf->memory_model != 4 && inf->memory_model != 6)
// continue;
// Check if this is exactly the mode we're looking for
if (WIDTH == inf->width && HEIGHT == inf->height && 256 == inf->pitch)
return (char *)inf->framebuffer;
}
// // Check if this is exactly the mode we're looking for
// if (WIDTH == inf->width && HEIGHT == inf->height && 256 == inf->pitch)
// return (char *)inf->framebuffer;
// }
return NULL;
}
// return NULL;
// }
extern int plr_display_dos_main(int argc, char *argv[]) {
char far *buf = (char far *)0xA0000; // VGA memory address
// extern int plr_display_dos_main(int argc, char *argv[]) {
extern int plr_display_dos_main(void) {
char *buf = (char *)0xA0000; // VGA memory address
int x, y;
unsigned char saved_mode = get_video_mode(); // Save original mode
set_vesa_video_mode(MODE_VESA_640_480_8); // Set our VGA mode
// unsigned char saved_mode = get_video_mode(); // Save original mode
// set_vesa_video_mode(MODE_VESA_640_480_8); // Set our VGA mode
buf = find_display_memory();
// buf = find_display_memory();
/* TODO: Fetch info about the mode, to know the availability */
/* as well as base address in memory */
/* https://wiki.osdev.org/VESA_Video_Modes */
// Now draw. We draw pixel-by-pixel by directly setting the video memory like
// it was an array. We step the color every 25 pixels so that we have 8 bands
// of even height.
for (y = 0; y < HEIGHT; y++) {
for (x = 0; x < WIDTH; x++) {
buf[y * WIDTH + x] = COLOR_OFFSET + y / COLOR_STEP;
// Now draw. We draw pixel-by-pixel by directly setting the video memory
// like it was an array. We step the color every 25 pixels so that we have 8
// bands of even height.
// for (y = 0; y < HEIGHT; y++) {
// for (x = 0; x < WIDTH; x++) {
// buf[y * WIDTH + x] = COLOR_OFFSET + y / COLOR_STEP;
// }
// }
// wait_for_key();
// set_video_mode(saved_mode); // Restore original mode
while (1) {
for (y = 0; y < HEIGHT; y++) {
for (x = 0; x < WIDTH; x++) {
buf[y * WIDTH + x] = COLOR_OFFSET + y / COLOR_STEP;
}
}
}
wait_for_key();
set_video_mode(saved_mode); // Restore original mode
return 0;
}
Player/Main/dos.s
+47
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@@ -0,0 +1,47 @@
.section .data
.align 4
# The DPMI Register Structure (50 bytes total)
# This holds the register states injected into Real Mode.
dpmi_regs:
.long 0 # edi (offset 0)
.long 0 # esi (offset 4)
.long 0 # ebp (offset 8)
.long 0 # esp / reserved (offset 12)
.long 0 # ebx (offset 16)
.long 0 # edx (offset 20)
.long 0 # ecx (offset 24)
dpmi_eax:
.long 0 # eax (offset 28)
.short 0 # flags(offset 32)
.short 0 # es (offset 34)
.short 0 # ds (offset 36)
.short 0 # fs (offset 38)
.short 0 # gs (offset 40)
.short 0 # ip (offset 42)
.short 0 # cs (offset 44)
.short 0 # sp (offset 46)
.short 0 # ss (offset 48)
.section .text
.global _start
_start:
call plr_display_dos_main
# 1. Set up the Real-Mode registers inside the DPMI structure
# AH = 4Ch (DOS Exit Function), AL = 00h (Return Code 0)
movl $0x00004C00, dpmi_eax
# 2. Call DPMI Simulate Real Mode Interrupt
movw $0x0300, %ax # DPMI Function: Simulate Real Mode Interrupt
movb $0x21, %bl # Interrupt number to trigger (INT 21h)
movb $0x00, %bh # Flags (Must be 0)
movw $0x0000, %cx # Number of words to copy to RM stack (0)
# ES:EDI points to our DPMI register block.
# In WDOSX flat model, %es already targets the flat data descriptor.
movl $dpmi_regs, %edi
int $0x31 # Trigger DPMI host to execute the RM interrupt
# --- Execution halts here as DOS terminates the program ---
Player/Makefile
+14 -5
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@@ -3,8 +3,9 @@ RELEASE ?= 0 # Optimize.
DEBUG ?= 1 # Emit debug info.
SQUEEZE ?= 0 # Nuclear option to save space.
BITS ?= 64
CFLAGS = -Wall -std=gnu99 -flto=thin -ffast-math -fno-ident -fvisibility=hidden
CFLAGS = -Wall -std=gnu99 -flto=thin -ffast-math -fno-ident -fvisibility=hidden -fuse-ld=lld
ifeq ($(MAKECMDGOALS),linux)
CFLAGS += -fno-pic -fno-pie
ifeq ($(RELEASE), 1)
CFLAGS += -Wl,--ignore-data-address-equality -Wl,--ignore-function-address-equality \
-Wl,--optimize-bb-jumps
@@ -30,7 +31,7 @@ else
CFLAGS += -DNDEBUG -Wl,--strip-all
endif
ifeq ($(RELEASE), 1)
CFLAGS += -O1 -fuse-ld=lld -fmerge-all-constants -Wl,-O3 \
CFLAGS += -O3 -fmerge-all-constants -Wl,-O3 \
-ffunction-sections -fdata-sections -Wl,--gc-sections \
-Wl,-mllvm,--vectorize-slp=true \
-Wl,-mllvm,--enable-gvn-hoist=true
@@ -49,6 +50,9 @@ DOS = maindos.c Display/dos.c
%.o: %.c $(DEPS)
$(CC) -c -o $@ $< $(CFLAGS)
%.o: %.s $(DEPS)
$(CC) -c -o $@ $< $(CFLAGS)
# TODO: Make it work with no stdlib.
linux: CFLAGS += -static -mbmi2 -nostdlib
linux: $(LINUX) | $(SRC)
@@ -59,9 +63,14 @@ wasm: CFLAGS += --target=wasm32 -nostdlib -Wl,--no-entry -msimd128 -mbulk-memory
wasm:
$(CC) -o player.wasm $(WASM) $(CFLAGS)
# TODO: Use https://github.com/amindlost/pmodew
dos: $(DOS) $(DEPS)
wcl386 -bt=dos4g -ox -l=dos4g $(DOS)
# https://tippach.hier-im-netz.de/wdosx
dos: CFLAGS += -ffreestanding -m32 -fno-PIC -fno-PIE -no-pie -nostdlib -nodefaultlibs
dos:
$(CC) -c ./Main/dos.s -o ./Main/dos.o $(CFLAGS)
$(CC) -c ./Display/dos.c -o ./Display/dos.o $(CFLAGS)
ld.lld -m elf_i386 --oformat binary -Ttext 0x0 --image-base=0x0 ./Main/dos.o ./Display/dos.o -o dos.bin
dosbox -noconsole -c "mount c $(PWD)" -c "c:" -c "WDOSX\STUBIT.EXE DOS.BIN" -exit
mv ./DOS.BIN ./DOS.EXE
clean:
rm -r *.o ../*.o
Player/maindos.c
-5
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@@ -1,5 +0,0 @@
#include "Display/display.h"
extern int main(int argc, char *argv[]) {
return plr_display_dos_main(argc, argv);
}