429 lines
13 KiB
C
429 lines
13 KiB
C
#include <stdint.h>
|
|
|
|
#include "dosfs/dosfs.h"
|
|
#include "print.h"
|
|
#include "interrupt.h"
|
|
#include "tss.h"
|
|
#include "paging.h"
|
|
#include "v86defs.h"
|
|
#include "tests.h"
|
|
|
|
typedef unsigned short word;
|
|
|
|
char check_apic() {
|
|
uint32_t eax, ebx, ecx, edx;
|
|
asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
|
|
return (edx & (1 << 9)) != 0;
|
|
}
|
|
char check_sse() {
|
|
uint32_t eax, ebx, ecx, edx;
|
|
asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
|
|
return (edx & (1 << 25)) != 0;
|
|
}
|
|
|
|
void enable_sse() {
|
|
asm volatile(
|
|
"mov %%cr0, %%eax\n"
|
|
"and $0xFFFB, %%ax\n"
|
|
"or $0x2, %%ax\n"
|
|
"mov %%eax, %%cr0\n"
|
|
"mov %%cr4, %%eax\n"
|
|
"or $0x600, %%ax\n"
|
|
"mov %%eax, %%cr4\n"
|
|
: : : "%eax"
|
|
);
|
|
}
|
|
|
|
uint32_t get_flags() {
|
|
uint32_t flags;
|
|
asm volatile("pushfd\npop %%eax":"=a"(flags));
|
|
return flags;
|
|
}
|
|
uint32_t get_cr0() {
|
|
uint32_t reg;
|
|
asm volatile("mov %%cr0, %%eax":"=a"(reg));
|
|
return reg;
|
|
}
|
|
uint32_t get_cr3() {
|
|
uint32_t reg;
|
|
asm volatile("mov %%cr3, %%eax":"=a"(reg));
|
|
return reg;
|
|
}
|
|
uint32_t get_cr4() {
|
|
uint32_t reg;
|
|
asm volatile("mov %%cr4, %%eax":"=a"(reg));
|
|
return reg;
|
|
}
|
|
|
|
extern char _loadusercode, _usercode, _eusercode;
|
|
void LoadUser() {
|
|
// Put Usermode code in proper place based on linker
|
|
char *s = &_loadusercode;
|
|
char *d = &_usercode;
|
|
while (d < &_eusercode)
|
|
*d++ = *s++;
|
|
}
|
|
|
|
extern char _edata, _v86code, _ev86code, _bstart, _bend;
|
|
void setup_binary() {
|
|
// Put V86 code in proper place based on linker
|
|
char *s = &_edata;
|
|
char *d = &_v86code;
|
|
while (d < &_ev86code)
|
|
*d++ = *s++;
|
|
|
|
LoadUser();
|
|
|
|
// Clear BSS area
|
|
for (d = &_bstart; d < &_bend; d++)
|
|
*d = 0;
|
|
}
|
|
|
|
uint16_t error_screen[80*50]; // 50-line VGA screen of error content
|
|
|
|
extern uint16_t *ivt;
|
|
uint16_t ivt_bkup[0x200];
|
|
uint8_t bios_bkup[0x40000];
|
|
void backup_ivtbios() {
|
|
for (int i = 0; i < 0x200; i++)
|
|
ivt_bkup[i] = ivt[i];
|
|
for (int i = 0; i < 0x40000; i++)
|
|
bios_bkup[i] = ((uint8_t*)0xC0000)[i];
|
|
}
|
|
|
|
// This should only be used during fault handling, as it is expensive
|
|
void ensure_v86env() {
|
|
for (int i = 0; i < 0x200; i++)
|
|
ivt[i] = ivt_bkup[i];
|
|
for (int i = 0; i < 0x40000; i++)
|
|
((uint8_t*)0xC0000)[i] = bios_bkup[i];
|
|
char *s = &_edata;
|
|
char *d = &_v86code;
|
|
while (d < &_ev86code)
|
|
*d++ = *s++;
|
|
for (int i = 0; i < 80*50; i++)
|
|
if (!(error_screen[i] & 0xFF00))
|
|
error_screen[i] = 0x0f00 | (error_screen[i] & 0x00FF);
|
|
}
|
|
|
|
void error_environment() {
|
|
ensure_v86env();
|
|
union V86Regs_t regs;
|
|
FARPTR v86_entry = i386LinearToFp(v86TextMode);
|
|
enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry), ®s);
|
|
printStr("Oh noes!!! System error! ;c Press E for a fun recovery :3", &error_screen[80]);
|
|
uint16_t *vga_text = ((uint16_t*)0xB8000);
|
|
for (int i = 0; i < 80*50; i++)
|
|
vga_text[i] = error_screen[i];
|
|
uint8_t key;
|
|
while (key = get_key(), key != 'e' && key != 'E');
|
|
v86_entry = i386LinearToFp(v86TransFlag);
|
|
enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry), ®s);
|
|
}
|
|
|
|
/*
|
|
Real Mode Accessible (First MB)
|
|
00000 - 00400 IVT (1kB)
|
|
00400 - 01000 Unused (3kB)
|
|
01000 - 04000 Free (12kB)
|
|
04000 - 07C00 V86 Code (15kB)
|
|
07C00 - 08000 Boot & V86 Code (512B)
|
|
08000 - 20000 V86 Code (96kB)
|
|
20000 - 30000 Disk Buffer (64kB)
|
|
30000 - 80000 Free (320kB)
|
|
80000 - 90000 Real Mode Stack (64kB)
|
|
90000 - A0000 Free (64kB)
|
|
A0000 - C0000 VGA (128kB)
|
|
C0000 - FFFFF BIOS Area (256kB)
|
|
Protected Only (1MB+)
|
|
100000 - 200000 Kernel Code (1mB)
|
|
200000 - 200080 TSS (128B)
|
|
200080 - 202080 TSS IOMAP (8kB)
|
|
202080 - 300000 Free (~1mB)
|
|
300000 - 310000 Task Stack (64kB)
|
|
310000 - 320000 Interrupt Stack (64kB)
|
|
320000 - 400000 Kernel Stack (896kB)
|
|
400000 - 700000 Usermode Code (3mB)
|
|
700000 - 800000 Usermode Stack (1mB)
|
|
*/
|
|
void DrawScreen() {
|
|
uint16_t *vga_text = (uint16_t *)0xB8000;
|
|
// clear screen
|
|
for (int i = 0; i < 80*25; i++)
|
|
vga_text[i] = 0x1f00;
|
|
// draw border
|
|
for (int c = 1; c < 79; c++) {
|
|
vga_text[c] = 0x1fc4; // top line
|
|
vga_text[(2*80)+c] = 0x1fc4; // 3rd line
|
|
vga_text[(24*80)+c] = 0x1fc4; // bottom line
|
|
}
|
|
for (int l = 1; l < 24; l++) {
|
|
vga_text[80*l] = 0x1fb3;
|
|
vga_text[(80*l)+79] = 0x1fb3;
|
|
}
|
|
vga_text[0] = 0x1fda;
|
|
vga_text[79] = 0x1fbf;
|
|
vga_text[2*80] = 0x1fc3;
|
|
vga_text[2*80+79] = 0x1fb4;
|
|
vga_text[24*80] = 0x1fc0;
|
|
vga_text[24*80+79] = 0x1fd9;
|
|
// name
|
|
vga_text[80+34] = 0x1f00 | '-';
|
|
vga_text[80+35] = 0x1f00 | ' ';
|
|
vga_text[80+36] = 0x1f00 | 'L';
|
|
vga_text[80+37] = 0x1f00 | 'u';
|
|
vga_text[80+38] = 0x1f00 | 'c';
|
|
vga_text[80+39] = 0x1f00 | 'i';
|
|
vga_text[80+40] = 0x1f00 | 'a';
|
|
vga_text[80+41] = 0x1f00 | 'O';
|
|
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) {
|
|
uint8_t *diskReadBuf = (uint8_t *)0x20000;
|
|
uint8_t pactive, ptype;
|
|
uint32_t pstart, psize;
|
|
pstart = DFS_GetPtnStart(0, diskReadBuf, 0, &pactive, &ptype, &psize);
|
|
return DFS_GetVolInfo(0, diskReadBuf, pstart, vi);
|
|
}
|
|
uint32_t OpenDir(uint8_t *path, VOLINFO *vi, DIRINFO *di) {
|
|
uint8_t *diskReadBuf = (uint8_t *)0x20000;
|
|
di->scratch = diskReadBuf;
|
|
return DFS_OpenDir(vi, path, di);
|
|
}
|
|
int32_t fileCount;
|
|
DIRENT *entries = (DIRENT*)0x400000;
|
|
void GetFileList(VOLINFO *vi, DIRINFO *di) {
|
|
uint8_t *diskReadBuf = (uint8_t *)0x20000;
|
|
DIRENT de;
|
|
fileCount = 0;
|
|
while (!DFS_GetNext(vi, di, &de)) {
|
|
if (de.name[0]) {
|
|
uint8_t *d = (uint8_t*)&entries[fileCount];
|
|
uint8_t *s = (uint8_t*)&de;
|
|
for (int i = 0; i < sizeof(DIRENT); i++)
|
|
d[i] = s[i];
|
|
fileCount++;
|
|
}
|
|
}
|
|
}
|
|
uint16_t *nextLine(uint16_t *p) {
|
|
uintptr_t v = (uintptr_t)p;
|
|
return (uint16_t *)(v + (160 - ((v - 0xb8000) % 160)));
|
|
}
|
|
void PrintFileList() {
|
|
uint16_t *vga_text = &((uint16_t *)0xb8000)[80*6+3];
|
|
for (int i = 0; i < fileCount; i++) {
|
|
DIRENT *de = &entries[i];
|
|
for (int i = 0; i < 11 && de->name[i]; i++) {
|
|
if (i == 8) { *(uint8_t*)vga_text = ' '; vga_text++; } // space for 8.3
|
|
*(uint8_t *)vga_text = de->name[i];
|
|
vga_text++;
|
|
}
|
|
vga_text += printStr(" ", vga_text);
|
|
vga_text += printDec((uint32_t)de->filesize_0 +
|
|
((uint32_t)de->filesize_1 << 8) +
|
|
((uint32_t)de->filesize_2 << 16) +
|
|
((uint32_t)de->filesize_3 << 24), vga_text);
|
|
*(uint8_t*)vga_text++ = 'B';
|
|
vga_text = nextLine(vga_text) + 3;
|
|
}
|
|
}
|
|
const uint32_t byteCount = 16*24;
|
|
uint8_t diskReadBuf[16*24];
|
|
void FileReadTest(uint8_t *path, VOLINFO *vi) {
|
|
uint32_t err;
|
|
uint16_t *vga_text = (uint16_t *)0xb8000;
|
|
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;
|
|
}
|
|
uint32_t successcount;
|
|
uint32_t readOffset = 0, lastReadOffset = -1;
|
|
char cont = 1;
|
|
for (;cont;) {
|
|
if (readOffset != lastReadOffset) {
|
|
vga_text = (uint16_t *)0xb8000;
|
|
for (int i = 0; i < 80*25; i++)
|
|
vga_text[i] = 0x0f00;
|
|
vga_text += printStr((char*)path, vga_text);
|
|
vga_text += printStr(" Up/Down to navigate - E to exit", vga_text);
|
|
vga_text = &((uint16_t*)0xb8000)[80];
|
|
DFS_Seek(&fi, readOffset, scratch);
|
|
if (fi.pointer != readOffset) {
|
|
vga_text += printStr("Seek Error", vga_text);
|
|
return;
|
|
}
|
|
err = DFS_ReadFile(&fi, scratch, diskReadBuf, &successcount, byteCount);
|
|
if (err && err != DFS_EOF) {
|
|
vga_text += printStr("Read Error: ", vga_text);
|
|
printDword(err, vga_text);
|
|
return;
|
|
}
|
|
for (uint32_t i = 0; i < successcount && i < byteCount; i += 16) {
|
|
vga_text += printDword(i + readOffset, vga_text);
|
|
vga_text += printChar(' ', vga_text);
|
|
vga_text += printChar(' ', vga_text);
|
|
for (uint32_t j = 0; j < 16; j++) {
|
|
if (i + j < successcount)
|
|
vga_text += printByte(diskReadBuf[i + j], vga_text);
|
|
else {
|
|
vga_text += printChar(' ', vga_text);
|
|
vga_text += printChar(' ', vga_text);
|
|
}
|
|
vga_text += printChar(' ', vga_text);
|
|
if (j == 7)
|
|
vga_text += printChar(' ', vga_text);
|
|
}
|
|
vga_text += printChar(' ', vga_text);
|
|
vga_text += printChar('|', vga_text);
|
|
for (uint32_t j = 0; j < 16; j++) {
|
|
if (i + j < successcount)
|
|
vga_text += printChar(diskReadBuf[i + j], vga_text);
|
|
else vga_text += printChar(' ', vga_text);
|
|
}
|
|
vga_text += printChar('|', vga_text);
|
|
vga_text = nextLine(vga_text);
|
|
}
|
|
lastReadOffset = readOffset;
|
|
}
|
|
uint16_t key = get_scancode();
|
|
switch (key & 0xff) {
|
|
case 0x50: // down
|
|
if ((readOffset + byteCount) < fi.filelen)
|
|
readOffset += byteCount;
|
|
break;
|
|
case 0x48: // up
|
|
//asm volatile ("xchg %bx,%bx");
|
|
if ((readOffset - byteCount) < fi.filelen)
|
|
readOffset -= byteCount;
|
|
break;
|
|
case 0x12: // e
|
|
cont = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
void FileSelect() {
|
|
fileCount = 5;
|
|
uint16_t *vga_text = (uint16_t *)0xb8000;
|
|
int32_t fileHovered = 0, lastFileHovered = 0;
|
|
for (char reload = 1;;) {
|
|
VOLINFO vi; DIRINFO di;
|
|
if (reload) {
|
|
OpenVol(&vi);
|
|
OpenDir((uint8_t*)"", &vi, &di);
|
|
GetFileList(&vi, &di);
|
|
reload = 0;
|
|
}
|
|
PrintFileList();
|
|
if (lastFileHovered != fileHovered) {
|
|
*(uint8_t*)&vga_text[80*(6+lastFileHovered)+2] = ' ';
|
|
lastFileHovered = fileHovered;
|
|
}
|
|
*(uint8_t*)&vga_text[80*(6+fileHovered)+2] = '>';
|
|
uint16_t key = get_scancode();
|
|
uint8_t path[13], tmp, trailingSpace;
|
|
switch (key & 0xff) { // scancode component
|
|
case 0x50: // down
|
|
fileHovered++;
|
|
if (fileHovered >= fileCount) fileHovered = 0;
|
|
break;
|
|
case 0x48: // up
|
|
fileHovered--;
|
|
if (fileHovered < 0) fileHovered = fileCount - 1;
|
|
break;
|
|
case 0x14: // t
|
|
RunTests(vga_text);
|
|
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);
|
|
DrawScreen();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void start() {
|
|
word *vga_text = (word *)0xb8000;
|
|
char h[] = "LuciaOS";
|
|
for (int i = 0; i < sizeof(h); i++)
|
|
*(char *)&vga_text[i] = h[i];
|
|
vga_text = &vga_text[80];
|
|
|
|
uint32_t o;
|
|
asm("mov %%esp, %%eax" : "=a"(o) : :);
|
|
vga_text += printDword(o, vga_text);
|
|
vga_text++;
|
|
asm("mov %%ebp, %%eax" : "=a"(o) : :);
|
|
vga_text += printDword(o, vga_text);
|
|
vga_text++;
|
|
|
|
//char c[] = "APIC support: ";
|
|
//char apic;
|
|
//printByte(apic = check_apic(), (short*)&vga_text[80*3 + sizeof(c) - 1]);
|
|
//for (int i = 0; i < sizeof(c); i++)
|
|
// *(char *)&vga_text[i+(80*3)] = c[i];
|
|
//if (!apic) return;
|
|
|
|
char sse_str[] = "SSE support: ";
|
|
vga_text += printStr("SSE: ", vga_text);
|
|
char sse = check_sse();
|
|
if (!sse) {
|
|
*vga_text = 'N';
|
|
return;
|
|
}
|
|
vga_text += printStr("Y ", vga_text);
|
|
enable_sse();
|
|
|
|
setup_binary();
|
|
|
|
// edit
|
|
setup_interrupts();
|
|
setup_tss();
|
|
init_paging();
|
|
//print_flags();
|
|
vga_text += printStr("CR0:", vga_text);
|
|
vga_text += printDword(get_cr0(), vga_text);
|
|
vga_text++;
|
|
//print_cr3();
|
|
//print_cr4();
|
|
backup_ivtbios();
|
|
|
|
vga_text = &((word *)0xb8000)[80];
|
|
vga_text += printStr("Press T for tests, or any key to continue... ", vga_text);
|
|
uint8_t key = get_key();
|
|
if (key == 't' || key == 'T')
|
|
RunTests(vga_text);
|
|
DrawScreen();
|
|
FileSelect();
|
|
}
|
|
|