328 lines
9.8 KiB
C
328 lines
9.8 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 "tss.h"
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#include "paging.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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struct __attribute((__packed__)) Int13DiskPacket_t {
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uint8_t size; // 0x10
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uint8_t reserved; // 0x00
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uint16_t blocks;
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uint32_t transfer_buffer; // 0x2300:0000
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uint64_t start_block;
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};
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extern struct Int13DiskPacket_t v86disk_addr_packet;
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extern void enter_v86(uint32_t ss, uint32_t esp, uint32_t cs, uint32_t eip);
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extern void v86Test();
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extern void v86TransFlag();
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extern void v86GfxMode();
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extern void v86TextMode();
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extern void v86DiskRead();
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extern char *jmp_usermode_test();
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extern char _edata, _v86code, _ev86code, _bstart, _bend, _loadusercode, _usercode, _eusercode;
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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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// Put Usermode code in proper place based on linker
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s = &_loadusercode;
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d = &_usercode;
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while (d < &_eusercode)
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*d++ = *s++;
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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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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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}
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void error_environment() {
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ensure_v86env();
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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));
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printStr("Oh noes!!! System error! ;c Press E for a fun recovery :3", &error_screen[80]);
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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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uint8_t key;
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for (key = get_key(); key != 'e' && key != 'E'; key = get_key());
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v86_entry = i386LinearToFp(v86TransFlag);
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enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry));
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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 Free (15kB)
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07C00 - 08000 Boot (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 TestV86() {
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FARPTR v86_entry = i386LinearToFp(v86Test);
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enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry));
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}
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void TestUser() {
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char *vga = jmp_usermode_test();
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for (int i = 0; i < 320; i++) {
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vga[i] = i;
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}
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}
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void TestDiskRead() {
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word *vga_text = (word *)0xb8000 + (80*5);
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vga_text += printStr("Setting Text Mode... ", vga_text);
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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));
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vga_text += printStr("Done. Starting Disk Read... ", vga_text);
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v86_entry = i386LinearToFp(v86DiskRead);
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enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry));
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vga_text = (word *)0xb8000;
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char *diskReadBuf = (char *)0x23000;
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for (int i = 0; i < (80*25)/2; i++) {
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printByte(diskReadBuf[i], &vga_text[i*2]);
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}
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}
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void TestFAT() {
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word *vga_text = (word *)0xb8000;
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uint8_t *diskReadBuf = (uint8_t *)0x22400;
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for (int i = 0; i < 80*25; i++)
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vga_text[i] = 0x0f00;
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VOLINFO vi;
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uint8_t pactive, ptype;
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uint32_t pstart, psize;
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pstart = DFS_GetPtnStart(0, diskReadBuf, 0, &pactive, &ptype, &psize);
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vga_text = (word *)0xb8000;
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vga_text += printStr("PartStart: ", vga_text);
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vga_text += printDword(pstart, vga_text);
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vga_text += 2;
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vga_text += printStr("PartSize: ", vga_text);
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vga_text += printDword(psize, vga_text);
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vga_text += 2;
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vga_text += printStr("PartActive: ", vga_text);
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vga_text += printByte(pactive, vga_text);
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vga_text += 2;
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vga_text += printStr("PartType: ", vga_text);
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vga_text += printByte(ptype, vga_text);
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vga_text = (word *)((((((uintptr_t)vga_text)-0xb8000) - ((((uintptr_t)vga_text)-0xb8000) % 160)) + 160)+0xb8000);
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//asm ("xchgw %bx, %bx");
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DFS_GetVolInfo(0, diskReadBuf, pstart, &vi);
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vga_text += printStr("Label: ", vga_text);
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vga_text += printStr((char*)vi.label, vga_text);
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vga_text += 2;
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vga_text += printStr("Sec/Clus: ", vga_text);
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vga_text += printByte(vi.secperclus, vga_text);
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vga_text += 2;
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vga_text += printStr("ResrvSec: ", vga_text);
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vga_text += printWord(vi.reservedsecs, vga_text);
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vga_text += 2;
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vga_text += printStr("NumSec: ", vga_text);
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vga_text += printDword(vi.numsecs, vga_text);
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vga_text += 2;
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vga_text += printStr("Sec/FAT: ", vga_text);
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vga_text += printDword(vi.secperfat, vga_text);
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vga_text += 2;
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vga_text += printStr("FAT1@: ", vga_text);
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vga_text += printDword(vi.fat1, vga_text);
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vga_text += 2;
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vga_text += printStr("ROOT@: ", vga_text);
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vga_text += printDword(vi.rootdir, vga_text);
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vga_text = (word *)((((((uintptr_t)vga_text)-0xb8000) - ((((uintptr_t)vga_text)-0xb8000) % 160)) + 160)+0xb8000);
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//asm ("xchgw %bx, %bx");
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vga_text += printStr("Files in root:", vga_text);
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DIRINFO di;
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di.scratch = diskReadBuf;
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DFS_OpenDir(&vi, (uint8_t*)"", &di);
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vga_text = (word *)((((((uintptr_t)vga_text)-0xb8000) - ((((uintptr_t)vga_text)-0xb8000) % 160)) + 160)+0xb8000);
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DIRENT de;
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while (!DFS_GetNext(&vi, &di, &de)) {
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if (de.name[0]) {
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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 + ((uint32_t)de.filesize_1 << 8) + ((uint32_t)de.filesize_2 << 16) + ((uint32_t)de.filesize_3 << 24), vga_text);
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*(uint8_t*)vga_text++ = 'B';
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vga_text = (word *)((((((uintptr_t)vga_text)-0xb8000) - ((((uintptr_t)vga_text)-0xb8000) % 160)) + 160)+0xb8000);
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}
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//asm ("xchgw %bx, %bx");
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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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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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return;
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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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vga_text += printStr("V86 Test... ", vga_text);
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//asm ("xchgw %bx, %bx");
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TestV86(); // has int 3 wait in v86
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vga_text = (word *)0xb8000 + (80*3);
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backup_ivtbios();
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vga_text += printStr("Done. Press 'N' for next test.", vga_text);
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uint8_t key;
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while ((key = get_key()) != 'N') {
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*vga_text = (*vga_text & 0xFF00) | key;
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vga_text++;
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}
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TestUser();
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kbd_wait();
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TestDiskRead();
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kbd_wait();
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TestFAT();
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kbd_wait();
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vga_text = &((uint16_t*)0xB8000)[80*16];
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vga_text += printStr("Press ` for a flagrant system error... ", vga_text);
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while ((key = get_key()) != '`') {
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*vga_text = (*vga_text & 0xFF00) | key;
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vga_text++;
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}
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// flagrant system error
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*((uint8_t*)0x1000000) = 0;
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}
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