277 lines
8.4 KiB
C
277 lines
8.4 KiB
C
#include "alloc.h"
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#include "allocArea.h"
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#include "ata.h"
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#include "elf.h"
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#include "exception.h"
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#include "gdt.h"
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#include "idt.h"
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#include "interrupt.h"
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#include "io.h"
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#include "irq.h"
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#include "kernel.h"
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#include "keyboard.h"
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#include "klibc.h"
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#include "mem.h"
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#include "mmuContext.h"
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#include "multiboot.h"
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#include "paging.h"
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#include "pit.h"
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#include "process.h"
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#include "serial.h"
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#include "stack.h"
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#include "stdarg.h"
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#include "swintr.h"
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#include "thread.h"
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#ifdef RUN_TEST
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#include "test.h"
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#endif
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#include "time.h"
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#include "types.h"
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#include "vga.h"
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#include "zero.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 << (bit)))
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void idleThread(void *arg)
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{
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(void)arg;
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while (1) {
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VGAPrintf(GREEN, BLACK, 0, VGA_HEIGHT - 1, "%d", (jiffies / HZ));
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threadYield();
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}
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}
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#define FILE_HEADER_SIZE 16
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#define FILE_MAX_SIZE 64 // In nb of sectors
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void loadUserSpace()
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{
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struct ata_partition *part = ATAGetPartition(1);
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if (part == NULL) {
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printf("No user partition found\n");
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return;
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}
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char *buf = malloc(FILE_MAX_SIZE * DISK_SECTOR_SIZE);
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if (buf == NULL) {
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printf("ENOMEM\n");
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return;
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}
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if (ATAReadPartitionSector(part, 0, 1, buf)) {
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printf("Fail to read from disk\n");
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return;
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}
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int sectorToRead;
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{
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char size[FILE_HEADER_SIZE + 1];
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memcpy(size, buf, FILE_HEADER_SIZE);
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size[FILE_HEADER_SIZE] = '\0';
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int sizeInt = atoi(size);
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sectorToRead = DIV_ROUND_UP(sizeInt, DISK_SECTOR_SIZE) - 1;
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}
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if (sectorToRead > FILE_MAX_SIZE - 1 || sectorToRead <= 0) {
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printf("Invalid file size: %d (sector)\n", sectorToRead);
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return;
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}
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if (ATAReadPartitionSector(part, 1, sectorToRead,
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buf + DISK_SECTOR_SIZE)) {
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printf("Fail to read from disk\n");
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return;
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}
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struct process *proc = processCreate("init");
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threadChangeCurrentContext(processGetMMUContext(proc));
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uaddr_t prog = loadElfProg(buf + FILE_HEADER_SIZE, proc);
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if (prog == (uaddr_t)NULL) {
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free(buf);
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return;
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}
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// Alloc user stack
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uaddr_t stackTop = 0xfffffffc;
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uaddr_t stackBottom = ALIGN_DOWN(stackTop, PAGE_SIZE);
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paddr_t stackPhy = allocPhyPage(1);
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assert(pageMap(stackBottom, stackPhy,
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PAGING_MEM_USER | PAGING_MEM_WRITE | PAGING_MEM_READ) == 0);
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unrefPhyPage(stackPhy);
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threadCreateUser("init", proc, prog, 0, 0, stackTop);
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processUnref(proc);
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threadChangeCurrentContext(NULL);
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free(buf);
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}
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// Multiboot information available here :
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// https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#kernel_002ec
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// https://www.gnu.org/software/grub/manual/multiboot/html_node/Boot-information-format.html#Boot%20information%20format
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void kmain(unsigned long magic, unsigned long addr)
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{
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unsigned long upperMemKB = 0;
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int memMapAvailable = 0;
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paddr_t lastUsedByMem;
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paddr_t firstUsedByMem;
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VGASetup(BLACK, GREEN);
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printf("[Setup] Interruptions\n");
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gdtSetup();
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idtSetup();
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irqSetup();
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pitSetup(HZ);
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// https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#Boot-information-format
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if (magic == MULTIBOOT_BOOTLOADER_MAGIC) { // Get loaded by Grub with mutliboot version 1
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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/* Are mem_* valid? */
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if (CHECK_FLAG(mbi->flags, 0)) {
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printf("mem_lower = %dKiB, mem_upper %dKiB\n", mbi->mem_lower, mbi->mem_upper);
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upperMemKB = mbi->mem_upper;
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}
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/* Is boot_device valid? */
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if (CHECK_FLAG(mbi->flags, 1)) {
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int disk = mbi->boot_device >> 24 & 0xff;
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int part1 = mbi->boot_device >> 16 & 0xff;
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int part2 = mbi->boot_device >> 8 & 0xff;
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int part3 = mbi->boot_device & 0xff;
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printf("boot_device = 0x%x (0x0 for floppy 0x80 for disk) part %d %d %d\n", disk,
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part1, part2, part3);
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}
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if (CHECK_FLAG(mbi->flags, 3)) {
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if (mbi->mods_count > 0) {
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multiboot_module_t *mod;
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uint32_t i;
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printf("mods_count = %d, mods_addr = 0x%x\n", (int)mbi->mods_count,
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(int)mbi->mods_addr);
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for (i = 0, mod = (multiboot_module_t *)mbi->mods_addr; i < mbi->mods_count;
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i++, mod++)
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printf(" mod_start = 0x%x, mod_end = 0x%x, cmdline = %s\n",
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(unsigned)mod->mod_start, (unsigned)mod->mod_end,
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(char *)mod->cmdline);
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}
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}
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if (CHECK_FLAG(mbi->flags, 5)) {
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stackSymbolSetup(mbi);
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}
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if (CHECK_FLAG(mbi->flags, 6)) {
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memMapAvailable = 1;
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}
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if (CHECK_FLAG(mbi->flags, 9)) {
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printf("Loaded by %s. ", (char *)mbi->boot_loader_name);
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}
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/* Is the command line passed? */
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if (CHECK_FLAG(mbi->flags, 2)) {
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printf("cmdline = %s\n", (char *)mbi->cmdline);
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}
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if (CHECK_FLAG(mbi->flags, 12)) {
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printf("Re configure Framebuffer from 0x%llx size (%dx%d) pitch %d bpp %d\n",
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mbi->framebuffer_addr, mbi->framebuffer_width, mbi->framebuffer_height,
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mbi->framebuffer_pitch, mbi->framebuffer_bpp);
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VGAConfigure(mbi->framebuffer_addr, mbi->framebuffer_width,
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mbi->framebuffer_height);
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}
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}
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if (upperMemKB == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upperMemKB = 32 * 1024;
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}
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printf("[Setup] Mem\n");
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memSetup(upperMemKB, &firstUsedByMem, &lastUsedByMem);
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if (memMapAvailable) {
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr;
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uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry);
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pr_devel("mmap buffer at 0x%x with %d entries\n", mbi->mmap_addr, size);
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for (uint i = 0; i < size; i++) {
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printf(" base_addr 0x%llx, length = 0x%llx, type = 0x%x\n", mmap[i].addr,
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mmap[i].len, (uint32_t)mmap[i].type);
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// Consider low memory taken (https://wiki.osdev.org/Detecting_Memory_(x86). For
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// example by VGA
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// Turns out linux and windows do the same !
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// https://lore.kernel.org/lkml/MWHPR21MB159330952629D36EEDE706B3D7379@MWHPR21MB1593.namprd21.prod.outlook.com/
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if (mmap[i].addr < 0x100000) {
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printf(" -> skipping\n");
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continue;
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}
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memAddBank(max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
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mmap[i].addr + mmap[i].len, mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
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}
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} else {
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printf("Cannot get memory Mapping information, using default value\n");
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memAddBank(lastUsedByMem, upperMemKB * 1024, 1);
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}
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printf("%ld pages used by kernel(0x%lx->0x%lx))",
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(lastUsedByMem - firstUsedByMem) / PAGE_SIZE, firstUsedByMem, lastUsedByMem);
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printf(" (%lu pages for MM)\n", (lastUsedByMem - (paddr_t)&__ld_kernel_end) / PAGE_SIZE);
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#ifdef RUN_TEST
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testPhymem();
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#endif
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printf("[Setup] Pagination\n");
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pagingSetup(firstUsedByMem, lastUsedByMem);
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VGAMap();
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printf("[Setup] HW interrupts\n");
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// Enabling the HW interrupts
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exceptionSetup();
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asm volatile("sti\n");
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printf("[Setup] Serial link (115200)\n");
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serialSetup(115200);
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printf("[Setup] allocation system\n");
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areaInit(firstUsedByMem, lastUsedByMem, _stack_bottom, _stack_top);
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printf("[Setup] IRQ handlers\n");
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keyboardSetup();
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irqSetRoutineWrapped(IRQ_KEYBOARD, keyboard_do_irq);
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mmuContextSetup();
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cpu_context_subsystem_setup();
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printf("[Setup] thread system\n");
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threadSetup(_stack_bottom, (_stack_top - _stack_bottom + 1));
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threadCreate("idle ", idleThread, NULL);
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processSetup();
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syscallSetup();
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irqSetRoutine(IRQ_TIMER, pit_handler);
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ATAInit();
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#ifdef RUN_TEST
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run_test();
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#endif
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printf("\nSystem init done: ");
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{
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uint free, used;
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memGetStat(&free, &used);
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printf("%dKB free %dKB Used\n", free * (PAGE_SIZE / 1024), used * (PAGE_SIZE / 1024));
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}
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loadUserSpace();
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// There is no real caller behind this point
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// So finish this by ourself
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threadExit();
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}
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