352 lines
10 KiB
C
352 lines
10 KiB
C
#include <stdint.h>
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#include "dosfs/dosfs.h"
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#include "print.h"
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#include "interrupt.h"
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#include "kbd.h"
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#include "tss.h"
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#include "paging.h"
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#include "v86defs.h"
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#include "tests.h"
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#include "progs.h"
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#include "helper.h"
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typedef unsigned short word;
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char check_apic() {
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uint32_t eax, ebx, ecx, edx;
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asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
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return (edx & (1 << 9)) != 0;
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}
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char check_sse() {
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uint32_t eax, ebx, ecx, edx;
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asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
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return (edx & (1 << 25)) != 0;
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}
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void enable_sse() {
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asm volatile(
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"mov %%cr0, %%eax\n"
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"and $0xFFFB, %%ax\n"
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"or $0x2, %%ax\n"
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"mov %%eax, %%cr0\n"
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"mov %%cr4, %%eax\n"
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"or $0x600, %%ax\n"
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"mov %%eax, %%cr4\n"
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: : : "%eax"
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);
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}
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uint32_t get_flags() {
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uint32_t flags;
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asm volatile("pushfd\npop %%eax":"=a"(flags));
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return flags;
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}
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uint32_t get_cr0() {
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uint32_t reg;
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asm volatile("mov %%cr0, %%eax":"=a"(reg));
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return reg;
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}
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uint32_t get_cr3() {
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uint32_t reg;
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asm volatile("mov %%cr3, %%eax":"=a"(reg));
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return reg;
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}
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uint32_t get_cr4() {
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uint32_t reg;
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asm volatile("mov %%cr4, %%eax":"=a"(reg));
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return reg;
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}
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extern char _loadusercode, _usercode, _eusercode;
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void LoadUser() {
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// Put Usermode code in proper place based on linker
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char *s = &_loadusercode;
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char *d = &_usercode;
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while (d < &_eusercode)
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*d++ = *s++;
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}
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extern char _edata, _v86code, _ev86code, _bstart, _bend;
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void setup_binary() {
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// Put V86 code in proper place based on linker
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char *s = &_edata;
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char *d = &_v86code;
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while (d < &_ev86code)
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*d++ = *s++;
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LoadUser();
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// Clear BSS area
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for (d = &_bstart; d < &_bend; d++)
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*d = 0;
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}
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uint16_t error_screen[80*50]; // 50-line VGA screen of error content
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extern uint16_t *ivt;
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uint16_t ivt_bkup[0x200];
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uint8_t bios_bkup[0x40000];
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void backup_ivtbios() {
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for (int i = 0; i < 0x200; i++)
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ivt_bkup[i] = ivt[i];
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for (int i = 0; i < 0x40000; i++)
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bios_bkup[i] = ((uint8_t*)0xC0000)[i];
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}
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// This should only be used during fault handling, as it is expensive
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void ensure_v86env() {
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for (int i = 0; i < 0x200; i++)
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ivt[i] = ivt_bkup[i];
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for (int i = 0; i < 0x40000; i++)
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((uint8_t*)0xC0000)[i] = bios_bkup[i];
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char *s = &_edata;
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char *d = &_v86code;
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while (d < &_ev86code)
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*d++ = *s++;
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}
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__attribute((__no_caller_saved_registers__))
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extern void return_prev_task();
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__attribute((__no_caller_saved_registers__))
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void error_environment() {
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ensure_v86env();
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for (int i = 0; i < 80*50; i++)
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if (!(error_screen[i] & 0xFF00))
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error_screen[i] = 0x0f00 | (error_screen[i] & 0x00FF);
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union V86Regs_t regs;
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FARPTR v86_entry = i386LinearToFp(v86TextMode);
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enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry), ®s);
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char str0[] = "Oh noes!!! System error! ;c ";
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printStr(str0, &error_screen[80]);
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printStr("Press E for a fun recovery :3", &error_screen[80+sizeof(str0)]);
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printStr("Press R to return to previous task", &error_screen[160+sizeof(str0)]);
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uint16_t *vga_text = ((uint16_t*)0xB8000);
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for (int i = 0; i < 80*50; i++)
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vga_text[i] = error_screen[i];
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for(;;) {
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uint8_t key = get_scancode() & 0xff;
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if (key == KEY_E) break;
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if (key == KEY_R) {
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// reset error screen
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for (int i = 0; i < (80*50)/2; i++)
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((uint32_t*)error_screen)[i] = 0x0f000f00;
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return_prev_task();
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}
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}
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v86_entry = i386LinearToFp(v86TransFlag);
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enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry), ®s);
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}
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/*
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Real Mode Accessible (First MB)
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00000 - 00400 IVT (1kB)
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00400 - 01000 Unused (3kB)
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01000 - 04000 Free (12kB)
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04000 - 07C00 V86 Code (15kB)
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07C00 - 08000 Boot & V86 Code (512B)
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08000 - 20000 V86 Code (96kB)
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20000 - 30000 Disk Buffer (64kB)
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30000 - 80000 Free (320kB)
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80000 - 90000 Real Mode Stack (64kB)
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90000 - A0000 Free (64kB)
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A0000 - C0000 VGA (128kB)
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C0000 - FFFFF BIOS Area (256kB)
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Protected Only (1MB+)
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100000 - 200000 Kernel Code (1mB)
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200000 - 200080 TSS (128B)
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200080 - 202080 TSS IOMAP (8kB)
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202080 - 300000 Free (~1mB)
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300000 - 310000 Task Stack (64kB)
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310000 - 320000 Interrupt Stack (64kB)
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320000 - 400000 Kernel Stack (896kB)
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400000 - 700000 Usermode Code (3mB)
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700000 - 800000 Usermode Stack (1mB)
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*/
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void DrawScreen() {
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uint16_t *vga_text = (uint16_t *)0xB8000;
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// clear screen
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for (int i = 0; i < 80*25; i++)
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vga_text[i] = 0x1f00;
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// draw border
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for (int c = 1; c < 79; c++) {
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vga_text[c] = 0x1fc4; // top line
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vga_text[(2*80)+c] = 0x1fc4; // 3rd line
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vga_text[(24*80)+c] = 0x1fc4; // bottom line
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}
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for (int l = 1; l < 24; l++) {
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vga_text[80*l] = 0x1fb3;
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vga_text[(80*l)+79] = 0x1fb3;
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}
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vga_text[0] = 0x1fda;
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vga_text[79] = 0x1fbf;
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vga_text[2*80] = 0x1fc3;
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vga_text[2*80+79] = 0x1fb4;
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vga_text[24*80] = 0x1fc0;
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vga_text[24*80+79] = 0x1fd9;
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// name
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vga_text[80+34] = 0x1f00 | '-';
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vga_text[80+35] = 0x1f00 | ' ';
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vga_text[80+36] = 0x1f00 | 'L';
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vga_text[80+37] = 0x1f00 | 'u';
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vga_text[80+38] = 0x1f00 | 'c';
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vga_text[80+39] = 0x1f00 | 'i';
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vga_text[80+40] = 0x1f00 | 'a';
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vga_text[80+41] = 0x1f00 | 'O';
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vga_text[80+42] = 0x1f00 | 'S';
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vga_text[80+43] = 0x1f00 | ' ';
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vga_text[80+44] = 0x1f00 | '-';
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}
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int32_t fileCount;
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DIRENT *entries = (DIRENT*)0x400000;
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void PrintFileList() {
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uint16_t *vga_text = &((uint16_t *)0xb8000)[80*6+3];
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for (int i = 0; i < fileCount; i++) {
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DIRENT *de = &entries[i];
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for (int i = 0; i < 11 && de->name[i]; i++) {
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if (i == 8) { *(uint8_t*)vga_text = ' '; vga_text++; } // space for 8.3
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*(uint8_t *)vga_text = de->name[i];
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vga_text++;
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}
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vga_text += printStr(" ", vga_text);
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vga_text += printDec((uint32_t)de->filesize_0 +
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((uint32_t)de->filesize_1 << 8) +
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((uint32_t)de->filesize_2 << 16) +
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((uint32_t)de->filesize_3 << 24), vga_text);
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*(uint8_t*)vga_text++ = 'B';
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vga_text = nextLine(vga_text) + 3;
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}
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}
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extern void create_child(uint32_t esp, uint32_t eip, uint32_t argc, ...);
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void FileSelect() {
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fileCount = 5;
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uint16_t *vga_text = (uint16_t *)0xb8000;
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int32_t fileHovered = 0, lastFileHovered = 0;
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for (char reload = 1;;) {
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// Info line (4)
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printStr("T to run tests - X to view in hex - V to view as text - P to load as program", &vga_text[80*4+2]);
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VOLINFO vi; DIRINFO di;
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if (reload) {
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OpenVol(&vi);
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OpenDir((uint8_t*)"", &vi, &di);
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GetFileList(entries, &fileCount, &vi, &di);
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reload = 0;
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}
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PrintFileList();
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if (lastFileHovered != fileHovered) {
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*(uint8_t*)&vga_text[80*(6+lastFileHovered)+2] = ' ';
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lastFileHovered = fileHovered;
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}
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*(uint8_t*)&vga_text[80*(6+fileHovered)+2] = '>';
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uint16_t key = get_scancode();
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uint8_t path[13];
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switch (key & 0xff) { // scancode component
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case 0x50: // down
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fileHovered++;
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if (fileHovered >= fileCount) fileHovered = 0;
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break;
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case 0x48: // up
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fileHovered--;
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if (fileHovered < 0) fileHovered = fileCount - 1;
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break;
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case 0x14: // t
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create_child(0x380000, (uintptr_t)RunTests, 0);
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SetCursorDisabled();
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DrawScreen();
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reload = 1;
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break;
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case KEY_P:
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File83ToPath((char*)entries[fileHovered].name, (char*)path);
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create_child(0x380000, (uintptr_t)ProgramLoadTest, 2, path, &vi);
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SetVideo25Lines();
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SetCursorDisabled();
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DrawScreen();
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reload = 1;
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break;
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case KEY_X:
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File83ToPath((char*)entries[fileHovered].name, (char*)path);
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//HexViewTest(path, &vi);
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create_child(0x380000, (uintptr_t)HexViewTest, 2, path, &vi);
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SetVideo25Lines();
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SetCursorDisabled();
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DrawScreen();
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break;
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case KEY_V:
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File83ToPath((char*)entries[fileHovered].name, (char*)path);
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//TextViewTest(path, &vi);
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create_child(0x380000, (uintptr_t)TextViewTest, 2, path, &vi);
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SetVideo25Lines();
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SetCursorDisabled();
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DrawScreen();
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reload = 1;
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break;
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default:
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break;
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}
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}
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}
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void start() {
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word *vga_text = (word *)0xb8000;
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char h[] = "LuciaOS";
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for (int i = 0; i < sizeof(h); i++)
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*(char *)&vga_text[i] = h[i];
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vga_text = &vga_text[80];
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// DL *should* be preserved
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uint8_t dl;
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asm volatile("nop":"=d"(dl));
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vga_text += printByte(dl, vga_text);
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vga_text++;
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uint32_t o;
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asm("mov %%esp, %%eax" : "=a"(o) : :);
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vga_text += printDword(o, vga_text);
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vga_text++;
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asm("mov %%ebp, %%eax" : "=a"(o) : :);
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vga_text += printDword(o, vga_text);
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vga_text++;
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//char c[] = "APIC support: ";
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//char apic;
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//printByte(apic = check_apic(), (short*)&vga_text[80*3 + sizeof(c) - 1]);
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//for (int i = 0; i < sizeof(c); i++)
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// *(char *)&vga_text[i+(80*3)] = c[i];
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//if (!apic) return;
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//char sse_str[] = "SSE support: ";
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//vga_text += printStr("SSE: ", vga_text);
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//char sse = check_sse();
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//if (!sse) {
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// *vga_text = 'N';
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//}
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//vga_text += printStr("Y ", vga_text);
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//enable_sse();
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setup_binary();
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// edit
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setup_interrupts();
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setup_tss();
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init_paging();
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//print_flags();
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vga_text += printStr("CR0:", vga_text);
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vga_text += printDword(get_cr0(), vga_text);
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vga_text++;
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//print_cr3();
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//print_cr4();
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backup_ivtbios();
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vga_text = &((word *)0xb8000)[160];
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vga_text += printStr("Press T for tests, or any key to continue... ", vga_text);
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uint8_t key = get_key();
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if (key == 't' || key == 'T')
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create_child(0x380000, (uintptr_t)RunTests, 0);
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SetVideo25Lines();
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SetCursorDisabled();
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DrawScreen();
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FileSelect();
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}
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