mirror of
https://github.com/Tom-on64/kern.git
synced 2026-11-03 18:22:22 +00:00
373 lines
12 KiB
C
373 lines
12 KiB
C
#include "screen.h"
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#include "idt.h"
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#include "isrs.h"
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#include "irq.h"
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#include "keyboard.h"
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#include "timer.h"
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#include "system.h"
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#include "disk.h"
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#include "string.h"
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#include "graphics.h"
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#include "physicalMemManager.h" // TODO: Name this better
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#define PROMPT "#> "
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char* filetable = (char*)0x7000; // Pretty sure we don't have to care about the bootloader at 0x7c00
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uint32_t memmapAddr = 0x30000;
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// Function declarations
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void printFiletable(char* ft);
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void printPhysicalMemmap();
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__attribute__ ((section ("entry"))) // Make sure that main() is at the start of kernel.bin
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void main() {
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// Interrupts
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setupIdt();
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setupIsrs();
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setupIrqs();
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sti();
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setupKeyboard();
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setupTimer();
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timerPhase(1000); // 1 tick per ~1ms
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// Memory manager setup
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uint32_t smapEntryCount = *(uint32_t*)0x8500;
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smapEntry_t* smapEntries = (smapEntry_t*)0x8504;
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uint32_t totalMemory = smapEntries[smapEntryCount - 1].baseAddress + smapEntries[smapEntryCount - 1].length - 1;
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setupMemoryManager(memmapAddr, totalMemory);
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for (uint32_t i = 0; i < smapEntryCount; i++) {
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if (smapEntries[i].type == 1) {
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initMemoryRegion(smapEntries[i].baseAddress, smapEntries[i].length);
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}
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}
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deinitMemoryRegion(0x1000, 0x9000); // Reserve kernel memory (under 0xa000)
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deinitMemoryRegion(memmapAddr, maxBlocks / BLOCKS_PER_BYTE);
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// Screen setup
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// TODO: Find font in filetable
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diskRead(36, 4, (char*)0x6000); // Read font from disk
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// loadFont((char*)0x6000);
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clear();
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print("kern.\n\n");
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diskRead(5, 1, filetable); // Read the filetable and store it in memory
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// Run Interactive Shell Program
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// TODO: Make it in another file
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while (1) {
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print(PROMPT);
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char* input = read('\n');
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if (input[0] == '\n') continue;
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char* args;
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if ((args = strchr(input, ' ')) == NULL) {
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args = strchr(input, '\n');
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}
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*args++ = '\0'; // Separate command from args
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if (strcmp(input, "clear") == 0) {
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clear();
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} else if (strcmp(input, "disk") == 0) {
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char buf[512] = { 0 };
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if (*args == '\0') {
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print("disk: ");
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print("No arguments given\n");
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print("Usage: disk <r/w> <sector> [data]\n");
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continue;
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}
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while (isSpace(*args)) { args++; } // Skip whitespace
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char mode = *args++;
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while (isSpace(*args)) { args++; }
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if (mode == 'r') {
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if (*args == '\0') {
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print("disk: ");
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print("Sector not specified\n");
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print("Usage: disk <r/w> <sector> [data]\n");
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continue;
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}
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uint32_t sector = atoi(args);
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print("Reading...\n");
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diskRead(sector, 1, buf);
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print("Contents:\n");
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for (size_t i = 0; i < 512; i++) {
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if (buf[i] != '\0') {
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putc(buf[i]);
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}
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}
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putc('\n');
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} else if (mode == 'w') {
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char* data;
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if ((data = strchr(args, ' ')) == NULL) {
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print("disk: ");
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print("No data given\n");
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print("Usage: disk <r/w> <sector> [data]\n");
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continue;
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}
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*data++ = '\0';
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uint32_t sector = atoi(args);
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while (isSpace(*args)) { args++; } // Skip whitespace
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strcpy(buf, data);
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print("Writing...\n");
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diskWrite(sector, 1, buf);
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} else {
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print("disk: ");
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print("Invalid access mode. Use r(ead) or w(rite)\n");
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print("Usage: disk <r/w> <sector> [data]\n");
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continue;
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}
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} else if (strcmp(input, "echo") == 0) {
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print(args);
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} else if (strcmp(input, "exit") == 0) {
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break;
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} else if (strcmp(input, "gfx") == 0) {
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clear();
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// Draw some stuff :)
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for (size_t i = 0; i < 120; i++) {
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for (size_t j = 0; j < 120; j++) {
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drawPixel(200 + i, 200 + j, GREEN);
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}
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}
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fillRect(200, 200, 320, 320, GREEN);
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drawLine(200, 200, 320, 320, RED);
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drawLine(320, 200, 200, 320, RED);
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drawLine(800, 300, 900, 400, BLUE);
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drawLine(900, 400, 1000, 300, BLUE);
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drawLine(1000, 300, 900, 200, BLUE);
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drawLine(900, 200, 800, 300, BLUE);
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drawLine(400, 350, 420, 100, rgb(0xee, 0x9f, 0x00));
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drawTriangle(200, 400, 400, 600, 200, 600, MAGENTA);
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fillTriangle(750, 400, 800, 450, 700, 450, CYAN);
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drawTriangle(960, 400, 1000, 500, 990, 580, YELLOW);
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drawRect(100, 650, 800, 900, rgb(0xe0, 0x0a, 0x3a));
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drawCircle(1500, 600, 300, WHITE);
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fillCircle(950, 750, 75, rgb(0xa2, 0xd6, 0xf9));
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read('q'); // Wait until we get a 'q'
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clear();
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} else if (strcmp(input, "help") == 0) {
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print("Available Commands:\n");
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print(" clear | Clears the screen\n");
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print(" disk | Reads/Writes data from/to the disk\n");
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print(" echo | Prints a message to stdout\n");
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print(" exit | Exits shell\n");
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print(" gfx | Does a graphics test\n");
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print(" help | Prints this message\n");
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print(" ls | Lists all available files\n");
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print(" memmap | Prints the memory map and info\n");
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print(" reboot | Reboots the system\n");
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print(" test | Performs tests\n");
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} else if (strcmp(input, "ls") == 0) {
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printFiletable(filetable);
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} else if (strcmp(input, "memmap") == 0) {
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printPhysicalMemmap();
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} else if (strcmp(input, "reboot") == 0) {
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outb(0x64, 0xFE);
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} else if (strcmp(input, "test") == 0) {
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print("Running Tests...\n");
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uint8_t buf[512];
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print("Read Test .......... ");
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diskRead(0, 1, (char*)buf);
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if (buf[510] == 0x55 && buf[511] == 0xaa) {
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print("[ DONE ]\n");
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} else {
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print("[ FAIL ]\n");
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}
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print("Write Test ......... ");
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buf[510] = 0x55; buf[511] = 0xaa;
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diskWrite(0, 1, (char*)buf);
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diskRead(0, 1, (char*)buf); // Idk how else to test if the right data was written (also could break the bootloader if it fails)
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if (buf[510] == 0x55 && buf[511] == 0xaa) {
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print("[ DONE ]\n");
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} else {
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print("[ FAIL ]\n");
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}
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print("Tests Finished!\n");
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} else {
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char* ft = filetable;
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uint8_t found = 0;
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while (*ft != '\0') {
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char filename[15] = { 0 };
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uint8_t offset = 0;
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for (uint8_t i = 0; i < 14; i++) {
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if (i == 9) {
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filename[offset++] = '.';
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continue;
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}
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if (*ft != '\0') { filename[offset++] = *ft; }
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ft++;
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}
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if (strcmp(input, filename) == 0) {
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ft++; // RESERVED
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uint8_t sector = *ft++;
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uint8_t size = *ft++;
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found++; // Set found to 1
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char* fileType = strchr(filename, '.') + 1;
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uint32_t neededBlocks = (size * 512) / BLOCK_SIZE + 1;
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/* Debug printing
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print("Allocating ");
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print(itoa(neededBlocks, 10));
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print(" Block");
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if (neededBlocks > 1) putc('s');
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*/
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char* address = allocBlocks(neededBlocks);
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if (address == NULL) {
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print("\nNot enough memory to allocate!\n");
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break;
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}
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/* Debug printing
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print("\nAllocated to address 0x");
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print(itoa((uint32_t)address, 16));
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print("!\n");
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*/
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diskRead(sector, size, address);
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if (strcmp(fileType, "bin") == 0) {
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clear();
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((void(*)(void))address)(); // Call program
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clear();
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} else if (strcmp(fileType, "tab") == 0) {
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printFiletable(address);
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} else {
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for (size_t i = 0; i < size * 512; i++) {
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if (address[i] != '\0') {
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putc(address[i]);
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}
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}
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putc('\n');
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}
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// Debug printing
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// print("Freeing allocated memory...\n");
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freeBlocks(address, neededBlocks);
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// print("Done!\n");
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break;
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}
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ft += 3;
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}
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if (!found) {
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print("Command not found: ");
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print(input);
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putc('\n');
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}
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}
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}
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}
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void printFiletable(char* ft) {
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while (*ft != '\0') {
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char filename[15] = { 0 };
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uint8_t offset = 0;
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for (uint8_t i = 0; i < 14; i++) {
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if (i == 9) {
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filename[offset++] = '.';
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continue;
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}
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if (*ft != '\0') { filename[offset++] = *ft; }
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ft++;
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}
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ft++; // RESERVED
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uint8_t sector = *ft++;
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uint8_t size = *ft++;
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if (sector < 10) putc('0');
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if (sector == 0) putc('0');
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else print(itoa(sector, 10));
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print(": ");
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print(filename);
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for (uint8_t i = 14 - strlen(filename); i > 0; i--) {
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putc(' ');
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}
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print(" | ");
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if (size >> 1) {
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print(itoa(size >> 1, 10));
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if (size & 0x01) { print(".5"); }
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print("kB\n");
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} else {
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print(itoa(size*512, 10));
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print("B\n");
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}
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}
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}
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void printPhysicalMemmap() {
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uint32_t entryCount = *(uint32_t*)SMAP_ADDRESS;
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smapEntry_t* smapEntry = (smapEntry_t*)(SMAP_ADDRESS+4);
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for (uint32_t i = 0; i < entryCount; i++) {
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print("Region ");
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print(itoa(i, 10));
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print(" - base: 0x");
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print(itoa(smapEntry->baseAddress, 16));
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print(" length: 0x");
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print(itoa(smapEntry->length, 16));
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print(" type: ");
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print(itoa(smapEntry->type, 10));
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switch (smapEntry->type) {
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case 1: print(" (Available)"); break;
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case 2: print(" (Reserved)"); break;
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case 3: print(" (ACPI Reclaim)"); break;
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case 4: print(" (ACPI NVS)"); break;
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default: print(" (Reserved)"); break;
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}
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putc('\n');
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smapEntry++;
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}
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smapEntry--; // We incremented it after the last entry
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print("\nTotal memory: 0x");
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print(itoa(smapEntry->baseAddress + smapEntry->length - 1, 16));
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print(" Bytes\n");
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print("Total 4kB Blocks: ");
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print(itoa(maxBlocks, 10));
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print("\nUsed or reserved blocks: ");
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print(itoa(usedBlocks, 10));
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print("\nFree blocks: ");
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print(itoa(maxBlocks - usedBlocks, 10));
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print("\n\n");
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}
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