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Bootloader can load more from disk, Text file viewer added

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This commit is contained in:
Lucia Ceionia
2023-02-06 00:01:48 -06:00
parent d0fbc7df56
commit d63430bb4d
2 changed files with 232 additions and 31 deletions
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37
boot.nasm
View File

@@ -1,12 +1,33 @@
secreadcnt equ 0x38
kernelreads equ 0x10000/(512*secreadcnt) ; 64K / Sector Size FIXME This underestimates when kernel size is not divisible by bytes per read
[ORG 0x7c00]
[BITS 16]
xor ax, ax
mov ds, ax
mov es, ax
mov ax, 0x8000
mov ss, ax
mov sp, 0xFF00
mov cx, kernelreads
read_loop:
xor ax, ax
mov ah, 0x42
mov si, addr_packet
int 0x13
jnc entry
jc err
add word [addr_packet_transfer_buff_seg], (secreadcnt*512)/16
add word [addr_packet_start_block], secreadcnt
loop read_loop
entry:
cli ; no interrupts
xor ax,ax
mov ds, ax
lgdt [gdt_desc] ; load gdt register
mov eax, cr0 ; set pmode bit
or al, 1
mov cr0, eax
jmp 08h:Pmode
err:
push 0xb800
pop es
xor di, di
@@ -20,15 +41,6 @@ loop err_print
hlt_loop:
hlt
jmp hlt_loop
entry:
cli ; no interrupts
xor ax,ax
mov ds, ax
lgdt [gdt_desc] ; load gdt register
mov eax, cr0 ; set pmode bit
or al, 1
mov cr0, eax
jmp 08h:Pmode
[BITS 32]
Pmode:
mov eax, 0x10
@@ -70,6 +82,7 @@ string: db 'DISK ERROR'
addr_packet:
db 0x10, 0x00 ; size, reserved
dw 0x39 ; blocks
addr_packet_transfer_buff: dd 0x08000000 ; transfer buffer
dw secreadcnt ; blocks
addr_packet_transfer_buff_off: dw 0x0000 ; transfer buffer offset
addr_packet_transfer_buff_seg: dw 0x0800 ; transfer buffer segment
addr_packet_start_block: dq 1 ; start block

226
kernel.c
View File

@@ -202,10 +202,6 @@ void DrawScreen() {
vga_text[80+42] = 0x1f00 | 'S';
vga_text[80+43] = 0x1f00 | ' ';
vga_text[80+44] = 0x1f00 | '-';
// Info line (4)
vga_text = &vga_text[80*4+2];
printStr("T to run tests - O to view file in hex", vga_text);
}
uint32_t OpenVol(VOLINFO *vi) {
@@ -258,7 +254,7 @@ void PrintFileList() {
vga_text = nextLine(vga_text) + 3;
}
}
void FileReadTest(uint8_t *path, VOLINFO *vi) {
void HexViewTest(uint8_t *path, VOLINFO *vi) {
uint32_t err;
uint16_t *vga_text = (uint16_t *)0xb8000;
uint8_t *scratch = (uint8_t *)0x20000;
@@ -389,11 +385,205 @@ void FileReadTest(uint8_t *path, VOLINFO *vi) {
}
}
}
void TextViewTest(uint8_t *path, VOLINFO *vi) {
uint16_t *vga_text = (uint16_t *)0xb8000;
uint32_t fileLen;
uint8_t *diskReadBuf = (uint8_t *)0x500000;
{
uint32_t err;
uint8_t *scratch = (uint8_t *)0x20000;
FILEINFO fi;
err = DFS_OpenFile(vi, path, DFS_READ, scratch, &fi);
if (err) {
vga_text += printStr("Open Error: ", vga_text);
printDword(err, vga_text);
return;
}
// file too large
if (fi.filelen > 0x300000) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
DFS_Seek(&fi, 0, scratch);
if (fi.pointer != 0) {
vga_text += printStr("Seek Error", vga_text);
return;
}
err = DFS_ReadFile(&fi, scratch, diskReadBuf, &fileLen, fi.filelen);
if (err && err != DFS_EOF) {
vga_text += printStr("Read Error: ", vga_text);
printDword(err, vga_text);
return;
}
}
uint32_t *lineOffsets = (uint32_t *)0x400000;
uint32_t lastLine;
{
char nl;
uint8_t c = 0x0A; // start with a pretend newline
uint32_t line = -1; // start a pretend line behind
for (int32_t o = -1; o < (int32_t)fileLen; c = diskReadBuf[++o]) {
// newline
if (c == 0x0A) {
lineOffsets[++line] = o;
}
// file too large
if ((uintptr_t)&lineOffsets[line] >= 0x4FFFFC) {
vga_text += printStr("File too large.", vga_text);
kbd_wait();
return;
}
}
lastLine = line;
}
uint32_t currLine = 0;
char cont = 1;
uint32_t screenSize = 80*25;
char redraw = 1;
uint32_t linesOnScreen = 0;
for (;cont;) {
if (redraw) {
vga_text = (uint16_t *)0xb8000;
for (int i = 0; i < screenSize; i++)
vga_text[i] = 0x0f00;
vga_text += printStr((char*)path, vga_text);
vga_text += 2;
vga_text += printStr("Line: ", vga_text);
vga_text += printDec(currLine, vga_text);
vga_text += printChar('/', vga_text);
vga_text += printDec(lastLine, vga_text);
vga_text += printStr(" Scroll: Up/Down PgUp/PgDown Home/End", vga_text);
{
const char prnt[] = "Exit: E ";
vga_text = &((uint16_t*)0xb8000)[80-sizeof(prnt)];
vga_text += printStr((char*)prnt, vga_text);
}
for (vga_text = &((uint16_t*)0xb8000)[84]; vga_text < &((uint16_t*)0xb8000)[screenSize]; vga_text += 80)
*(uint8_t*)vga_text = '|';
vga_text = &((uint16_t*)0xb8000)[0];
uint32_t lineOff = 6;
uint8_t c = 0x0A; // start with a pretend newline
uint32_t line = currLine - 1; // start a pretend line behind
int32_t o = lineOffsets[currLine]; // the real or fake newline on previous line
linesOnScreen = screenSize/80;
for (; o < (int32_t)fileLen && vga_text < &((uint16_t*)0xb8000)[screenSize]; c = diskReadBuf[++o]) {
// newline
if (c == 0x0A) {
vga_text = nextLine(vga_text);
line++;
{
uint16_t *vga_tmp = vga_text;
uint16_t decTmp[11];
char cnt = printDec(line, decTmp);
char off = cnt <= 4 ? 0 : cnt - 4;
vga_tmp += 4 - (cnt - off);
for (int i = off; i < cnt; i++, vga_tmp++)
*(uint8_t*)vga_tmp = (uint8_t)decTmp[i];
}
vga_text += 6;
lineOff = 6;
continue;
}
*(uint8_t*)vga_text = c;
vga_text++;
lineOff++;
if (lineOff == 80) { // last char
vga_text += 6;
lineOff = 6;
linesOnScreen--;
}
}
redraw = 0;
}
uint16_t key = get_scancode();
union V86Regs_t regs;
FARPTR v86_entry;
switch (key & 0xff) {
case KEY_DOWN: // down
if (currLine < lastLine && lineOffsets[currLine+1] < fileLen) {
currLine++;
redraw = 1;
}
break;
case KEY_UP: // up
if ((currLine > 0 && lineOffsets[currLine-1] < fileLen) || currLine == 1) {
currLine--;
redraw = 1;
}
break;
case KEY_PGDOWN:
if (currLine+(linesOnScreen/2) <= lastLine && lineOffsets[currLine+(linesOnScreen/2)] < fileLen) {
currLine += (linesOnScreen/2);
redraw = 1;
} else goto end;
break;
case KEY_PGUP:
if (currLine > (linesOnScreen/2) && lineOffsets[currLine-(linesOnScreen/2)] < fileLen) {
currLine -= (linesOnScreen/2);
redraw = 1;
} else if (currLine <= (linesOnScreen/2)) {
currLine = 0;
redraw = 1;
}
break;
case KEY_HOME: home:
if (currLine != 0) {
currLine = 0;
redraw = 1;
}
break;
case KEY_END: end:
if (currLine != lastLine) {
currLine = lastLine;
redraw = 1;
}
break;
case KEY_E: // e
cont = 0;
break;
case KEY_F2:
if (screenSize != 80*25) {
SetVideo25Lines();
SetCursorDisabled();
screenSize = 80*25;
redraw = 1;
}
break;
case KEY_F5:
if (screenSize != 80*50) {
SetVideo50Lines();
SetCursorDisabled();
screenSize = 80*50;
redraw = 1;
}
break;
default:
break;
}
}
}
void File83ToPath(char *src, char *path) {
uint8_t tmp, trailingSpace;
for (trailingSpace=0, tmp = 0; tmp < 8 && src[tmp]; tmp++) {
path[tmp] = src[tmp];
if (src[tmp] == ' ') trailingSpace++;
else trailingSpace = 0;
}
tmp -= trailingSpace;
path[tmp++] = '.';
for (int i = 8; i < 11 && src[i]; i++, tmp++) {
path[tmp] = src[i];
}
path[tmp] = 0;
}
void FileSelect() {
fileCount = 5;
uint16_t *vga_text = (uint16_t *)0xb8000;
int32_t fileHovered = 0, lastFileHovered = 0;
for (char reload = 1;;) {
// Info line (4)
printStr("T to run tests - X to view in hex - V to view as text", &vga_text[80*4+2]);
VOLINFO vi; DIRINFO di;
if (reload) {
OpenVol(&vi);
@@ -408,7 +598,7 @@ void FileSelect() {
}
*(uint8_t*)&vga_text[80*(6+fileHovered)+2] = '>';
uint16_t key = get_scancode();
uint8_t path[13], tmp, trailingSpace;
uint8_t path[13];
switch (key & 0xff) { // scancode component
case 0x50: // down
fileHovered++;
@@ -423,23 +613,21 @@ void FileSelect() {
DrawScreen();
reload = 1;
break;
case 0x18: // o
for (trailingSpace=0, tmp = 0; tmp < 8 && entries[fileHovered].name[tmp]; tmp++) {
path[tmp] = entries[fileHovered].name[tmp];
if (entries[fileHovered].name[tmp] == ' ') trailingSpace++;
else trailingSpace = 0;
}
tmp -= trailingSpace;
path[tmp++] = '.';
for (int i = 8; i < 11 && entries[fileHovered].name[i]; i++, tmp++) {
path[tmp] = entries[fileHovered].name[i];
}
path[tmp] = 0;
FileReadTest(path, &vi);
case KEY_X:
File83ToPath((char*)entries[fileHovered].name, (char*)path);
HexViewTest(path, &vi);
SetVideo25Lines();
SetCursorDisabled();
DrawScreen();
break;
case KEY_V:
File83ToPath((char*)entries[fileHovered].name, (char*)path);
TextViewTest(path, &vi);
SetVideo25Lines();
SetCursorDisabled();
DrawScreen();
reload = 1;
break;
default:
break;
}