Improved multiboot compliance
parent
f48f8072c0
commit
f2c8b8ac5c
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@ -0,0 +1,16 @@
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{
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"configurations": [
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{
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"name": "Linux",
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"includePath": [
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"${workspaceFolder}/**"
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],
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"defines": [],
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"compilerPath": "/usr/bin/gcc",
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"cStandard": "gnu17",
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"cppStandard": "gnu++14",
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"intelliSenseMode": "linux-gcc-x64"
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}
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],
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"version": 4
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}
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2
Makefile
2
Makefile
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@ -24,7 +24,7 @@ all: clean build
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build: build_kernel run
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run:
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$(EMULATOR) -d int -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std
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$(EMULATOR) -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std
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build_kernel: $(OBJ_LINK_LIST)
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@ -21,9 +21,9 @@ void MMU::enable(){
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//we will fill all 1024 entries in the table, mapping 4 megabytes
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for(unsigned int i = 0; i < 1024; i++)
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{
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// As the address is page aligned, it will always leave 12 bits zeroed.
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// Those bits are used by the attributes ;)
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first_page_table[i] = (i * 0x1000) | 3; // attributes: supervisor level, read/write, present.
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// As the address is page aligned, it will always leave 12 bits zeroed.
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// Those bits are used by the attributes ;)
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first_page_table[i] = (i * 0x1000) | 3; // attributes: supervisor level, read/write, present.
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}
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// attributes: supervisor level, read/write, present
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@ -32,4 +32,10 @@ void MMU::enable(){
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loadPageDirectory(this->page_directory);
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enablePaging();
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}
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uint32_t MMU::readTableEntry(int entry){
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return this->page_directory[entry];
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}
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@ -7,6 +7,7 @@ extern "C" void enablePaging();
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class MMU {
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public:
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void enable ();
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uint32_t readTableEntry(int);
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private:
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uint32_t page_directory[1024] __attribute__((aligned(4096)));
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@ -0,0 +1,33 @@
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#pragma once
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/**
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* We'll need something to this effect to allocate memory in the kernel
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* this will hopefully someday implement a full slab allocator
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**/
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enum SlabState {
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empty,
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partial,
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full
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};
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class CacheSlab {
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const int SlabSize = 4000;
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void* start = 0x0;
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};
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class Allocator {
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public:
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Allocator();
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~Allocator();
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void* kmalloc( int size );
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void kfree (void* address);
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private:
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CacheSlab** _cache;
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};
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@ -471,6 +471,17 @@ _start:
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/*Setup the stack pointer to point to the beginning of our stack */
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/* I believe its a hight address growing down to lower adress for the stack on x86*/
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mov $stack_top, %esp
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/*Reset EFLAGS*/
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pushl $0
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popf
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/* push the pointer to the Multiboot information structure*/
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pushl %ebx
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/* push the magic value */
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pushl %eax
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call early_main
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cli
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load_gdt:
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@ -88,7 +88,7 @@ void kterm_write(const char* data, size_t size) {
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}
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void kterm_writestring(const char* data ){
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AS_KERNEL();
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// AS_KERNEL();
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kterm_write(data, strlen(data));
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}
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@ -97,20 +97,115 @@ void test_serial(){
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extern "C" {
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void early_main(){
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init_serial();
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print_serial("\033[31;42mEarly main called!\n");
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}
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void kernel_main (void) {
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print_serial("Kernel main called!\n");
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void early_main(unsigned long magic, unsigned long addr){
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/** initialize terminal interface */
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kterm_init();
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multiboot_info_t *mbi;
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if (magic != MULTIBOOT_BOOTLOADER_MAGIC){
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printf("Invalid magic number: 0x%x\n", (unsigned) magic);
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return;
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}
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/* Set MBI to the addresss of the multiboot information structure*/
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mbi = (multiboot_info_t *) addr;
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/* Print out the flags */
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printf("flags = 0x%x\n", (unsigned) mbi->flags);
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/* Are mem_* valid? */
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if ( CHECK_FLAG(mbi->flags,0)){
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printf("mem_lower = %uKB, mem_upper = %uKB\n");
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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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printf("boot_device = 0x0%x\n", (unsigned) mbi->boot_device);
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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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/* Are mods_* valid? */
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if(CHECK_FLAG ( mbi->flags, 3)){
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multiboot_module_t *mod;
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int i;
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printf("mods count = %d, mods_addr = 0x%x\n", (int) mbi->mods_count, (int) mbi->mods_addr);
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for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
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printf(" mod start = 0x%x, mod_end = 0x%x, cmdline = %s\n", (unsigned) mod->mod_start, (unsigned) mod->mod_end, (char*) mod->cmdline);
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}
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}
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/* Bits 4 and 5 are mutually exclusive! */
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if (CHECK_FLAG (mbi->flags, 4) && CHECK_FLAG(mbi->flags, 5)){
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printf("Both bits 4 and 5 are set.\n");
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return;
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}
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/* Is the symbol table of a.out valid? */
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if (CHECK_FLAG(mbi->flags, 4)){
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multiboot_aout_symbol_table_t *multiboot_aout_sym = &(mbi->u.aout_sym);
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printf( "multiboot_aout_symbol_table: tabsize = 0x%0x, strsize = 0x%x, addr = 0x%x\n",
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(unsigned) multiboot_aout_sym->tabsize,
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(unsigned) multiboot_aout_sym->strsize,
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(unsigned) multiboot_aout_sym->addr);
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}
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/* Is the section header table of ELF valid? */
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if (CHECK_FLAG(mbi->flags, 5)){
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multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
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printf("multiboot_elf_sec: num = %u, size = 0x%x, addr = 0x%x, shnd = 0x%x\n",
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(unsigned) multiboot_elf_sec->num, (unsigned) multiboot_elf_sec->size,
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(unsigned) multiboot_elf_sec->addr, (unsigned) multiboot_elf_sec->shndx);
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}
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// AAAAAH memory map, Yes please!
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/* Are mmap_* valid? */
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if (CHECK_FLAG(mbi->flags, 6)){
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multiboot_memory_map_t *mmap;
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printf("mmap_addr = 0x%x, mmap_length = 0x%x\n",
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(unsigned) mbi->mmap_addr, (unsigned) mbi->mmap_length);
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for (mmap = (multiboot_memory_map_t *) mbi->mmap_addr;
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(unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length;
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mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
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printf(
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"size = 0x%x, base_addr = 0x%x%08x, length = 0x%x%08x, type = 0x%x\n",
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(unsigned) mmap->size,
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(unsigned) (mmap->addr >> 32),
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(unsigned) (mmap->addr & 0xffffffff),
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(unsigned) (mmap->len >> 32),
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(unsigned) (mmap->len & 0xffffffff),
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(unsigned) mmap->type);
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}
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}
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/* Draw diagonal blue line */
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if (CHECK_FLAG (mbi->flags, 12)){
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printf("Can draw!");
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}
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}
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void kernel_main (void) {
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init_serial();
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/** Setup the MMU **/
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//kterm_writestring("Starting MMU...\n");
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@ -120,24 +215,10 @@ extern "C" {
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/** Wrtite stuff to the screen to test the terminal**/
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kterm_writestring("Hello world!\n");
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kterm_writestring("We got newline support!\n");
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/** Test scrolling **/
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for(int i=0; i < 5; i++){
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delay(500);
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kterm_writestring("We have implemented terminal scrolling!\n");
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}
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/** Test objective cpp **/
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kterm_writestring("Testing C++ object support\n");
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auto testObject = Test();
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testObject.printMe();
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/** test interrupt handlers **/
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//asm volatile ("int $0x03");
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@ -147,7 +228,7 @@ extern "C" {
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while (true){
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//Read time indefinetely
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read_rtc();
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printf( "UTC time: %2d-%2d-%2d %2d:%2d:%2d : (YY-MM-DD h:mm:ss)\r" ,year, month, day, hour, minute, second);
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printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
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delay(1000);
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}
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@ -4,7 +4,11 @@ extern "C" {
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#include "arch/i386/tty/kterm.h"
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}
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#include "multiboot.h"
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#include "arch/i386/idt/idt.h"
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#include "MMU.h"
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#include "io.h"
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#include "time.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
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@ -0,0 +1,274 @@
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/* multiboot.h - Multiboot header file. */
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/* Copyright (C) 1999,2003,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ANY
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* DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MULTIBOOT_HEADER
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#define MULTIBOOT_HEADER 1
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/* How many bytes from the start of the file we search for the header. */
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#define MULTIBOOT_SEARCH 8192
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#define MULTIBOOT_HEADER_ALIGN 4
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/* The magic field should contain this. */
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#define MULTIBOOT_HEADER_MAGIC 0x1BADB002
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/* This should be in %eax. */
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#define MULTIBOOT_BOOTLOADER_MAGIC 0x2BADB002
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/* Alignment of multiboot modules. */
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#define MULTIBOOT_MOD_ALIGN 0x00001000
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/* Alignment of the multiboot info structure. */
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#define MULTIBOOT_INFO_ALIGN 0x00000004
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/* Flags set in the ’flags’ member of the multiboot header. */
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/* Align all boot modules on i386 page (4KB) boundaries. */
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#define MULTIBOOT_PAGE_ALIGN 0x00000001
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/* Must pass memory information to OS. */
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#define MULTIBOOT_MEMORY_INFO 0x00000002
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/* Must pass video information to OS. */
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#define MULTIBOOT_VIDEO_MODE 0x00000004
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/* This flag indicates the use of the address fields in the header. */
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#define MULTIBOOT_AOUT_KLUDGE 0x00010000
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/* Flags to be set in the ’flags’ member of the multiboot info structure. */
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/* is there basic lower/upper memory information? */
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#define MULTIBOOT_INFO_MEMORY 0x00000001
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/* is there a boot device set? */
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#define MULTIBOOT_INFO_BOOTDEV 0x00000002
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/* is the command-line defined? */
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#define MULTIBOOT_INFO_CMDLINE 0x00000004
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/* are there modules to do something with? */
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#define MULTIBOOT_INFO_MODS 0x00000008
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/* These next two are mutually exclusive */
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/* is there a symbol table loaded? */
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#define MULTIBOOT_INFO_AOUT_SYMS 0x00000010
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/* is there an ELF section header table? */
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#define MULTIBOOT_INFO_ELF_SHDR 0X00000020
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/* is there a full memory map? */
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#define MULTIBOOT_INFO_MEM_MAP 0x00000040
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/* Is there drive info? */
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#define MULTIBOOT_INFO_DRIVE_INFO 0x00000080
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/* Is there a config table? */
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#define MULTIBOOT_INFO_CONFIG_TABLE 0x00000100
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/* Is there a boot loader name? */
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#define MULTIBOOT_INFO_BOOT_LOADER_NAME 0x00000200
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/* Is there a APM table? */
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#define MULTIBOOT_INFO_APM_TABLE 0x00000400
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/* Is there video information? */
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#define MULTIBOOT_INFO_VBE_INFO 0x00000800
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#define MULTIBOOT_INFO_FRAMEBUFFER_INFO 0x00001000
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#ifndef ASM_FILE
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typedef unsigned char multiboot_uint8_t;
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typedef unsigned short multiboot_uint16_t;
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typedef unsigned int multiboot_uint32_t;
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typedef unsigned long long multiboot_uint64_t;
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struct multiboot_header
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{
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/* Must be MULTIBOOT_MAGIC - see above. */
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multiboot_uint32_t magic;
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/* Feature flags. */
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multiboot_uint32_t flags;
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/* The above fields plus this one must equal 0 mod 2^32. */
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multiboot_uint32_t checksum;
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/* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */
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multiboot_uint32_t header_addr;
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multiboot_uint32_t load_addr;
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multiboot_uint32_t load_end_addr;
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multiboot_uint32_t bss_end_addr;
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multiboot_uint32_t entry_addr;
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/* These are only valid if MULTIBOOT_VIDEO_MODE is set. */
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multiboot_uint32_t mode_type;
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multiboot_uint32_t width;
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multiboot_uint32_t height;
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multiboot_uint32_t depth;
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};
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/* The symbol table for a.out. */
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struct multiboot_aout_symbol_table
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{
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multiboot_uint32_t tabsize;
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multiboot_uint32_t strsize;
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multiboot_uint32_t addr;
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multiboot_uint32_t reserved;
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};
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typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;
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/* The section header table for ELF. */
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struct multiboot_elf_section_header_table
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{
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multiboot_uint32_t num;
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multiboot_uint32_t size;
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multiboot_uint32_t addr;
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multiboot_uint32_t shndx;
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};
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typedef struct multiboot_elf_section_header_table multiboot_elf_section_header_table_t;
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struct multiboot_info
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{
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/* Multiboot info version number */
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multiboot_uint32_t flags;
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/* Available memory from BIOS */
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multiboot_uint32_t mem_lower;
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multiboot_uint32_t mem_upper;
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/* "root" partition */
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multiboot_uint32_t boot_device;
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/* Kernel command line */
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multiboot_uint32_t cmdline;
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/* Boot-Module list */
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multiboot_uint32_t mods_count;
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multiboot_uint32_t mods_addr;
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union
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{
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multiboot_aout_symbol_table_t aout_sym;
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multiboot_elf_section_header_table_t elf_sec;
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} u;
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/* Memory Mapping buffer */
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multiboot_uint32_t mmap_length;
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multiboot_uint32_t mmap_addr;
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/* Drive Info buffer */
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multiboot_uint32_t drives_length;
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multiboot_uint32_t drives_addr;
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/* ROM configuration table */
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multiboot_uint32_t config_table;
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/* Boot Loader Name */
|
||||
multiboot_uint32_t boot_loader_name;
|
||||
|
||||
/* APM table */
|
||||
multiboot_uint32_t apm_table;
|
||||
|
||||
/* Video */
|
||||
multiboot_uint32_t vbe_control_info;
|
||||
multiboot_uint32_t vbe_mode_info;
|
||||
multiboot_uint16_t vbe_mode;
|
||||
multiboot_uint16_t vbe_interface_seg;
|
||||
multiboot_uint16_t vbe_interface_off;
|
||||
multiboot_uint16_t vbe_interface_len;
|
||||
|
||||
multiboot_uint64_t framebuffer_addr;
|
||||
multiboot_uint32_t framebuffer_pitch;
|
||||
multiboot_uint32_t framebuffer_width;
|
||||
multiboot_uint32_t framebuffer_height;
|
||||
multiboot_uint8_t framebuffer_bpp;
|
||||
#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
|
||||
#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB 1
|
||||
#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT 2
|
||||
multiboot_uint8_t framebuffer_type;
|
||||
union
|
||||
{
|
||||
struct
|
||||
{
|
||||
multiboot_uint32_t framebuffer_palette_addr;
|
||||
multiboot_uint16_t framebuffer_palette_num_colors;
|
||||
};
|
||||
struct
|
||||
{
|
||||
multiboot_uint8_t framebuffer_red_field_position;
|
||||
multiboot_uint8_t framebuffer_red_mask_size;
|
||||
multiboot_uint8_t framebuffer_green_field_position;
|
||||
multiboot_uint8_t framebuffer_green_mask_size;
|
||||
multiboot_uint8_t framebuffer_blue_field_position;
|
||||
multiboot_uint8_t framebuffer_blue_mask_size;
|
||||
};
|
||||
};
|
||||
};
|
||||
typedef struct multiboot_info multiboot_info_t;
|
||||
|
||||
struct multiboot_color
|
||||
{
|
||||
multiboot_uint8_t red;
|
||||
multiboot_uint8_t green;
|
||||
multiboot_uint8_t blue;
|
||||
};
|
||||
|
||||
struct multiboot_mmap_entry
|
||||
{
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint64_t addr;
|
||||
multiboot_uint64_t len;
|
||||
#define MULTIBOOT_MEMORY_AVAILABLE 1
|
||||
#define MULTIBOOT_MEMORY_RESERVED 2
|
||||
#define MULTIBOOT_MEMORY_ACPI_RECLAIMABLE 3
|
||||
#define MULTIBOOT_MEMORY_NVS 4
|
||||
#define MULTIBOOT_MEMORY_BADRAM 5
|
||||
multiboot_uint32_t type;
|
||||
} __attribute__((packed));
|
||||
typedef struct multiboot_mmap_entry multiboot_memory_map_t;
|
||||
|
||||
struct multiboot_mod_list
|
||||
{
|
||||
/* the memory used goes from bytes ’mod_start’ to ’mod_end-1’ inclusive */
|
||||
multiboot_uint32_t mod_start;
|
||||
multiboot_uint32_t mod_end;
|
||||
|
||||
/* Module command line */
|
||||
multiboot_uint32_t cmdline;
|
||||
|
||||
/* padding to take it to 16 bytes (must be zero) */
|
||||
multiboot_uint32_t pad;
|
||||
};
|
||||
typedef struct multiboot_mod_list multiboot_module_t;
|
||||
|
||||
/* APM BIOS info. */
|
||||
struct multiboot_apm_info
|
||||
{
|
||||
multiboot_uint16_t version;
|
||||
multiboot_uint16_t cseg;
|
||||
multiboot_uint32_t offset;
|
||||
multiboot_uint16_t cseg_16;
|
||||
multiboot_uint16_t dseg;
|
||||
multiboot_uint16_t flags;
|
||||
multiboot_uint16_t cseg_len;
|
||||
multiboot_uint16_t cseg_16_len;
|
||||
multiboot_uint16_t dseg_len;
|
||||
};
|
||||
|
||||
#endif /* ! ASM_FILE */
|
||||
|
||||
#endif /* ! MULTIBOOT_HEADER */
|
||||
Loading…
Reference in New Issue