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Paging improvements (still borked), grub memory

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Furkan Mudanyali 2022-07-24 07:16:00 +03:00
parent 7d0791d806
commit 1b6689a4de
13 changed files with 426 additions and 97 deletions
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2
README.md
View File

@ -7,7 +7,7 @@ Welcome to rockOS project, a hobby OS that aims to run rogue and nethack.
- PIC initialization
- PIT timer
- Keyboard driver
- Bitmap paging
- a thing that is supposed to be paging
## Usage

2
kernel/Makefile
View File

@ -13,7 +13,7 @@ EXEC_PREFIX?=$(PREFIX)
BOOTDIR?=$(EXEC_PREFIX)/boot
INCLUDEDIR?=$(PREFIX)/include
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra -fstack-protector-strong -mgeneral-regs-only -mno-red-zone
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra -Wformat -Wpedantic -fstack-protector-strong -mgeneral-regs-only -mno-red-zone
CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
LDFLAGS:=$(LDFLAGS)
LIBS:=$(LIBS) -nostdlib -lk -lgcc

3
kernel/arch/i386/boot/boot.S
View File

@ -42,6 +42,9 @@ stack_top:
.global _start
.type _start, @function
_start:
push %eax
push %ebx
call bootloader_init
cli
call gdt_init # initialize the GDT
movl $stack_top, %esp

21
kernel/arch/i386/boot/idt.c
View File

@ -21,10 +21,27 @@
#include <rockos/timer.h>
#include <stdio.h>
__attribute__((interrupt)) void int_handler(void* frame, unsigned int number) {
__attribute__((interrupt)) void int_handler(uint32_t* frame, unsigned int number) {
if (number <= 21) {
printf("%s\n", err_msg[number]);
}
switch(number){
case 14:
if(((uint32_t)frame & 1) == 1) printf("P Present Set.\n");
if(((uint32_t)frame & 2) == 2) printf("W Write Set.\n");
if(((uint32_t)frame & 4) == 4) printf("U User Set.\n");
if(((uint32_t)frame & 8) == 8) printf("R Reserved Write Set.\n");
if(((uint32_t)frame & 16) == 16) printf("PK Protection Key Set.\n");
if(((uint32_t)frame & 32) == 32) printf("SS Shadow Stack Set.\n");
if(((uint32_t)frame & 64) == 64) printf("SGX Software Guard Extensions Set.\n");
uint32_t address = 0;
asm("mov %%cr2, %%eax"
: "=a"(address)
:
);
printf("Address: %#08X\n", address);
break;
}
asm("cli;hlt");
}
@ -69,7 +86,7 @@ INT_WRAPPER(31)
static __attribute__((aligned(0x10))) idt_entry_t idt[IDT_MAX_DESCRIPTORS];
static idtr_t idtptr;
void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags) {
void idt_set_descriptor(uint8_t vector, void (*isr)(void*), uint8_t flags) {
idt_entry_t* descriptor = &idt[vector];
descriptor->isr_low = (uint32_t)isr & 0xFFFF;
descriptor->kernel_cs = 0x08; // Whatever offset kernel code selector is in GDT

2
kernel/arch/i386/linker.ld
View File

@ -3,6 +3,7 @@ ENTRY(_start)
SECTIONS
{
. = 1M;
_rockos_start = .;
.text BLOCK(4K) : ALIGN(4K)
{
@ -25,4 +26,5 @@ SECTIONS
*(COMMON)
*(.bss)
}
_rockos_end = .;
}

47
kernel/arch/i386/vga/tty.c
View File

@ -10,17 +10,20 @@
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
static uint16_t* const VGA_OLDMEMORY = (uint16_t*) 0xB8000;
static size_t terminal_row;
static size_t terminal_column;
static uint8_t terminal_color;
static uint16_t* terminal_buffer;
static uint16_t* terminal_oldbuffer;
void terminal_initialize(void) {
terminal_row = 0;
terminal_column = 0;
terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer = VGA_MEMORY;
terminal_oldbuffer = VGA_OLDMEMORY;
for (size_t y = 0; y < VGA_HEIGHT; y++) {
for (size_t x = 0; x < VGA_WIDTH; x++) {
const size_t index = y * VGA_WIDTH + x;
@ -38,22 +41,44 @@ void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
terminal_buffer[index] = vga_entry(c, color);
}
void scroll_screen_fwd() {
memcpy(terminal_oldbuffer, &terminal_buffer[VGA_WIDTH], (VGA_HEIGHT*2-1) * VGA_WIDTH);
for(size_t x = 0; x < VGA_WIDTH; ++x) {
terminal_oldbuffer[(VGA_HEIGHT-1)*VGA_WIDTH + x] = vga_entry(' ', terminal_color);
}
memcpy(terminal_buffer, terminal_oldbuffer, VGA_HEIGHT*VGA_WIDTH);
--terminal_row;
}
void terminal_putchar(char c) {
unsigned char uc = c;
if (uc == '\n') {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_row = 0;
}
} else {
terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
switch(uc) {
case '\n':
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_row = 0;
if (++terminal_row == VGA_HEIGHT)
scroll_screen_fwd();
break;
case 0x08:
if(!terminal_column & !terminal_row)
return;
if(--terminal_column == 0) {
terminal_column = VGA_WIDTH;
if(--terminal_row == 0) {
terminal_row =VGA_HEIGHT;
}
}
}
terminal_putentryat(' ', terminal_color, terminal_column, terminal_row);
break;
default:
terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
scroll_screen_fwd();
}
}
break;
}
}

276
kernel/include/rockos/multiboot.h Normal file
View File

@ -0,0 +1,276 @@
/* multiboot.h - Multiboot header file. */
/* Copyright (C) 1999,2003,2007,2008,2009,2010 Free Software Foundation, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ANY
* DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef MULTIBOOT_HEADER
#define MULTIBOOT_HEADER 1
/* How many bytes from the start of the file we search for the header. */
#define MULTIBOOT_SEARCH 8192
#define MULTIBOOT_HEADER_ALIGN 4
/* The magic field should contain this. */
#define MULTIBOOT_HEADER_MAGIC 0x1BADB002
/* This should be in %eax. */
#define MULTIBOOT_BOOTLOADER_MAGIC 0x2BADB002
/* Alignment of multiboot modules. */
#define MULTIBOOT_MOD_ALIGN 0x00001000
/* Alignment of the multiboot info structure. */
#define MULTIBOOT_INFO_ALIGN 0x00000004
/* Flags set in the ’flags’ member of the multiboot header. */
/* Align all boot modules on i386 page (4KB) boundaries. */
#define MULTIBOOT_PAGE_ALIGN 0x00000001
/* Must pass memory information to OS. */
#define MULTIBOOT_MEMORY_INFO 0x00000002
/* Must pass video information to OS. */
#define MULTIBOOT_VIDEO_MODE 0x00000004
/* This flag indicates the use of the address fields in the header. */
#define MULTIBOOT_AOUT_KLUDGE 0x00010000
/* Flags to be set in the ’flags’ member of the multiboot info structure. */
/* is there basic lower/upper memory information? */
#define MULTIBOOT_INFO_MEMORY 0x00000001
/* is there a boot device set? */
#define MULTIBOOT_INFO_BOOTDEV 0x00000002
/* is the command-line defined? */
#define MULTIBOOT_INFO_CMDLINE 0x00000004
/* are there modules to do something with? */
#define MULTIBOOT_INFO_MODS 0x00000008
/* These next two are mutually exclusive */
/* is there a symbol table loaded? */
#define MULTIBOOT_INFO_AOUT_SYMS 0x00000010
/* is there an ELF section header table? */
#define MULTIBOOT_INFO_ELF_SHDR 0X00000020
/* is there a full memory map? */
#define MULTIBOOT_INFO_MEM_MAP 0x00000040
/* Is there drive info? */
#define MULTIBOOT_INFO_DRIVE_INFO 0x00000080
/* Is there a config table? */
#define MULTIBOOT_INFO_CONFIG_TABLE 0x00000100
/* Is there a boot loader name? */
#define MULTIBOOT_INFO_BOOT_LOADER_NAME 0x00000200
/* Is there a APM table? */
#define MULTIBOOT_INFO_APM_TABLE 0x00000400
/* Is there video information? */
#define MULTIBOOT_INFO_VBE_INFO 0x00000800
#define MULTIBOOT_INFO_FRAMEBUFFER_INFO 0x00001000
#ifndef ASM_FILE
typedef unsigned char multiboot_uint8_t;
typedef unsigned short multiboot_uint16_t;
typedef unsigned int multiboot_uint32_t;
typedef unsigned long long multiboot_uint64_t;
struct multiboot_header
{
/* Must be MULTIBOOT_MAGIC - see above. */
multiboot_uint32_t magic;
/* Feature flags. */
multiboot_uint32_t flags;
/* The above fields plus this one must equal 0 mod 2^32. */
multiboot_uint32_t checksum;
/* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */
multiboot_uint32_t header_addr;
multiboot_uint32_t load_addr;
multiboot_uint32_t load_end_addr;
multiboot_uint32_t bss_end_addr;
multiboot_uint32_t entry_addr;
/* These are only valid if MULTIBOOT_VIDEO_MODE is set. */
multiboot_uint32_t mode_type;
multiboot_uint32_t width;
multiboot_uint32_t height;
multiboot_uint32_t depth;
};
/* The symbol table for a.out. */
struct multiboot_aout_symbol_table
{
multiboot_uint32_t tabsize;
multiboot_uint32_t strsize;
multiboot_uint32_t addr;
multiboot_uint32_t reserved;
};
typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;
/* The section header table for ELF. */
struct multiboot_elf_section_header_table
{
multiboot_uint32_t num;
multiboot_uint32_t size;
multiboot_uint32_t addr;
multiboot_uint32_t shndx;
};
typedef struct multiboot_elf_section_header_table multiboot_elf_section_header_table_t;
struct multiboot_info
{
/* Multiboot info version number */
multiboot_uint32_t flags;
/* Available memory from BIOS */
multiboot_uint32_t mem_lower;
multiboot_uint32_t mem_upper;
/* "root" partition */
multiboot_uint32_t boot_device;
/* Kernel command line */
multiboot_uint32_t cmdline;
/* Boot-Module list */
multiboot_uint32_t mods_count;
multiboot_uint32_t mods_addr;
union
{
multiboot_aout_symbol_table_t aout_sym;
multiboot_elf_section_header_table_t elf_sec;
} u;
/* Memory Mapping buffer */
multiboot_uint32_t mmap_length;
multiboot_uint32_t mmap_addr;
/* Drive Info buffer */
multiboot_uint32_t drives_length;
multiboot_uint32_t drives_addr;
/* ROM configuration table */
multiboot_uint32_t config_table;
/* 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_uint32_t addr_low;
multiboot_uint32_t addr_high;
multiboot_uint32_t len_low;
multiboot_uint32_t len_high;
#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 */

5
kernel/include/rockos/paging.h
View File

@ -17,6 +17,7 @@
*/
#include <stdint.h>
#include <stddef.h>
#ifndef _ROCKOS_PAGING_H
#define _ROCKOS_PAGING_H
@ -24,8 +25,6 @@
#define PAGE_ENTRIES 1024
#define PAGE_SIZE 4096
uint32_t* get_page();
void set_page_free(uint32_t*);
uint32_t get_used_memsize();
void alloc_pages(uint32_t*, size_t);
#endif

62
kernel/rockos/kernel.c
View File

@ -6,8 +6,32 @@
#include <rockos/hal.h>
#include <rockos/timer.h>
#include <rockos/paging.h>
#include <rockos/multiboot.h>
#include <string.h>
void kernel_main(void) {
extern char _rockos_start, _rockos_end;
static multiboot_info_t* multiboot_info;
void panic(char* str) {
printf("%s\n", str);
asm("cli;hlt");
}
void bootloader_init(multiboot_info_t* mbd, unsigned int magic) {
/* Make sure the magic number matches for memory mapping*/
if(magic != MULTIBOOT_BOOTLOADER_MAGIC) {
panic("invalid magic number!");
}
/* Check bit 6 to see if we have a valid memory map */
if(!(mbd->flags >> 6 & 0x1)) {
panic("invalid memory map given by GRUB bootloader");
}
multiboot_info = mbd;
}
void kernel_main() {
printf("Hello, kernel World!\n");
printf("String test: %s\n", "HELLOOOOO");
printf("Float test: %.10f\n", 0.123456789);
@ -27,23 +51,27 @@ void kernel_main(void) {
min = (min & 0x0F) + ((min / 16) * 10);
hour = ((hour & 0x0F) + (((hour & 0x70) / 16) * 10)) | (hour & 0x80);
printf("Time: %02d:%02d:%02d UTC+3\n", (hour + 3) % 24, min, sec);
uint32_t first = get_used_memsize();
uint32_t limit = 1024 * 8;
uint32_t* pages[limit];
for(uint32_t i = 0; i < limit; i++) {
pages[i] = get_page();
}
uint32_t middle = get_used_memsize();
for(uint32_t i = 0; i < limit; i++) {
set_page_free(pages[i]);
}
uint32_t last = get_used_memsize();
printf("Before Allocation: %d KiB\nAfter allocation: %d KiB\nAfter Clear: %d KiB\n", first, middle, last);
printf("Finished!\n");
printf("RockOS Start: %#08X, RockOS End: %#08X\n", &_rockos_start, &_rockos_end);
for(multiboot_uint32_t i = 0; i < multiboot_info->mmap_length; i += sizeof(multiboot_memory_map_t)) {
multiboot_memory_map_t* mmmt =
(multiboot_memory_map_t*) (multiboot_info->mmap_addr + i);
printf("Start Addr: %#08X | Length: %#08X | Size: %#08X | Type: %X\n",
mmmt->addr_low, mmmt->len_low, mmmt->size, mmmt->type);
if(mmmt->type == MULTIBOOT_MEMORY_AVAILABLE) {
//
}
}
uint32_t* pages;
alloc_pages(pages, 1);
printf("Page Start: %#08X\n", *pages);
alloc_pages(*pages, 8192);
for(int i = 0; i < 8192; ++i){
//printf("Page Start: %#08X\n", (uint32_t)(*pages + i));
}
unsigned char key;
for(;;) {

10
kernel/rockos/keyboard.c
View File

@ -20,15 +20,15 @@ static uint8_t keyset[89];
static uint64_t keytimes[89];
static unsigned char keymap[89] = {
0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0,
'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 0, 0,
0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0x08,
'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n', 0,
'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\',
'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0, '*', 0, ' ', 0
};
static unsigned char keymapshift[89] = {
0, 0, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 0,
'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 0, 0,
0, 0, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 0x08,
'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n', 0,
'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '\"', '`', 0, '|',
'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 0, '*', 0, ' ', 0
};
@ -43,7 +43,7 @@ void initialize_keyset() {
uint8_t caps_lock = 0;
__attribute__((interrupt)) void keyboard_handler(void* frame) {
__attribute__((interrupt)) void keyboard_handler(__attribute__((unused)) void* frame) {
interrupt_key = inb(0x60);
pic_eoi(1);
if((interrupt_key & 128) == 128) {

89
kernel/rockos/paging.c
View File

@ -1,5 +1,7 @@
#include <rockos/paging.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
void load_page_dir(uint32_t* page_dir) {
asm volatile (
@ -18,80 +20,57 @@ void enable_paging() {
);
}
static uint32_t page_dir[PAGE_ENTRIES] __attribute__((aligned(PAGE_SIZE)));
static uint32_t first_page_table[PAGE_ENTRIES] __attribute__((aligned(PAGE_SIZE)));
extern char _rockos_end;
static uint32_t* page_dir __attribute__((packed));
void paging_init() {
page_dir = (uint32_t*)(((uint32_t)&_rockos_end & ~0xFFF) + 0x1000);
for(int i = 0; i < PAGE_ENTRIES; i++) {
// Supervisor: only kernel-mode can access
// Write Enabled: Can be both read and written to
// Not Present: Page table not present
page_dir[i] = 0x00000002;
*(page_dir + i) = 0x00000002;
}
uint32_t* firstPageTable __attribute__((packed)) = (uint32_t*)(((uint32_t)page_dir & ~0xFFF) + 0x1000);
for(unsigned int i = 0; i < PAGE_ENTRIES; i++) {
// As the address is page aligned, it will leave 12 bits zeroed,
// which are used by the attributes.
first_page_table[i] = (i * 0x1000) | 0x103; // attr: supervisor, r/w, present, 9th bit set
firstPageTable[i] = (i*0x1000) | 0x003; // attr: supervisor, r/w, present, 9th bit set
}
page_dir[0] = ((unsigned int)first_page_table) | 3; //attr: supervisor, r/w, present
page_dir[0] = (uint32_t)firstPageTable | 0x003; //attr: supervisor, r/w, present
load_page_dir(page_dir);
enable_paging();
}
uint32_t* get_page() {
// Search directories for tables
for (int i = 0; i < PAGE_ENTRIES; ++i) {
// If table is found (if 2nd and 1st bit are set)
if((page_dir[i] & 0x3) == 0x3) {
// Cast table location
uint32_t *mytable = (uint32_t*)((page_dir[i] >> 12) << 12);
// Search table for pages
for(int j = 0; j < PAGE_ENTRIES; ++j) {
// If page is found (9th, 2nd, 1st bit set)
if((mytable[j] & 0x103) == 0x103) {
mytable[j] &= ~0x100; // Unset 9th bit
return &mytable[j];
void alloc_pages(uint32_t* pages, size_t size) {
for(size_t i = 0; i < size;) {
for(size_t j = 0; j < PAGE_ENTRIES && i < size; ++j) {
printf("oklahoma %#08X\n", page_dir[j]);
if((page_dir[j] & 3) == 3) {
uint32_t* pageTable __attribute__((packed)) = page_dir[j] & ~0xFFF;
for(int k = 0; k < PAGE_ENTRIES && i < size; ++k) {
if((pageTable[k] & 3) == 3 && (pageTable[k] & 0x100) != 0x100) {
pageTable[k] |= 0x100;
pages[i] = ((uint32_t)pageTable & ~0xFFF) | (pageTable[k] >> 12);
printf("connecticut %#08X\n", pages[i]);
++i;
}
}
} // No page found till last entry
// Check if next table is not initialized
if((page_dir[i+1] & 0x3) != 0x3) {
// The last page of previous table points to the next table
uint32_t *newtable = &mytable[2*PAGE_ENTRIES];
for(int k = 0; k < PAGE_ENTRIES; ++k) {
newtable[k] = (k * 0x1000) | 0x103; // attr: supervisor, r/w, present, 9th bit set
} else {
printf("aa %#08X\n", (page_dir[j-1] & ~0xFFF) + 0x4000);
uint32_t* newPageTable __attribute__((packed)) = (page_dir[j-1] & ~0xFFF) + 0x4000;
printf("alabama %#08X, %#08X\n", newPageTable[0], (page_dir[j-1] & ~0xFFF) + 0x4000);
for(unsigned int l = 0; l < PAGE_ENTRIES; l++) {
// As the address is page aligned, it will leave 12 bits zeroed,
// which are used by the attributes.
newPageTable[l] = (l*0x1000) | 0x003; // attr: supervisor, r/w, present, 9th bit set
}
page_dir[i+1] = ((unsigned int)newtable) | 3; //attr: supervisor, r/w, present
page_dir[j] = (uint32_t)newPageTable | 0x003;
printf("NewPageTable: %#08X\n", page_dir[j]);
--j;
}
}
}
return 0;
}
void set_page_free(uint32_t* addr) {
// Set 9th, 2nd and 1st bits
*(addr) |= 0x103;
}
uint32_t get_used_memsize() {
uint32_t used = 0;
// Iterate over page_dirs
for(int i = 0; i < PAGE_ENTRIES; ++i) {
// If a table is available
if((page_dir[i] & 3) == 3) {
// Cast the table
uint32_t* table = ((page_dir[i] >> 12) << 12);
// Iterate over table
for(int j = 0; j < PAGE_ENTRIES; ++j) {
// If a page is unavailable
if((table[j] & 0x103) != 0x103) {
// Then it is used
used += 4*4;
}
}
}
}
return used;
}

2
kernel/rockos/timer.c
View File

@ -6,7 +6,7 @@
uint64_t ticks = 0;
uint8_t subticks = 0;
__attribute__((interrupt)) void timer_handler(void* frame) {
__attribute__((interrupt)) void timer_handler(__attribute__((unused)) void* frame) {
if(++subticks == SUBTICKS_PER_TICK) {
++ticks;
subticks = 0;

2
libc/Makefile
View File

@ -13,7 +13,7 @@ EXEC_PREFIX?=$(PREFIX)
INCLUDEDIR?=$(PREFIX)/include
LIBDIR?=$(EXEC_PREFIX)/lib
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra -fstack-protector
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra -Wpedantic -Werror -fstack-protector
CPPFLAGS:=$(CPPFLAGS) -D__is_libc -Iinclude
LIBK_CFLAGS:=$(CFLAGS)
LIBK_CPPFLAGS:=$(CPPFLAGS) -D__is_libk