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ROSE/kernel.c

321 lines
9.0 KiB
C
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#include <stdint.h>
#include "dosfs/dosfs.h"
#include "print.h"
#include "interrupt.h"
#include "kbd.h"
#include "tss.h"
#include "paging.h"
#include "v86defs.h"
#include "tests.h"
#include "progs.h"
#include "helper.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), &regs);
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];
while ((get_scancode() & 0xff) != KEY_E);
v86_entry = i386LinearToFp(v86TransFlag);
enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry), &regs);
}
/*
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 | '-';
}
int32_t fileCount;
DIRENT *entries = (DIRENT*)0x400000;
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;
}
}
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);
OpenDir((uint8_t*)"", &vi, &di);
GetFileList(entries, &fileCount, &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];
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);
SetCursorDisabled();
DrawScreen();
reload = 1;
break;
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;
}
}
}
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();
SetVideo25Lines();
SetCursorDisabled();
FileSelect();
}
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