Merge branch 'master' into rust

TODO.md

@@ -1,9 +1,19 @@
-# TO DO 
+# TO DO
- - Multiboot (read end of memory etc)
+ - FIX E820
- - String interpolation
+ - actual gdt
+ - CPU freq detection
+ - proc?
  - Screen scrolling
+ - Malloc all kernel code
+ - (Random lib: random num from a to b?)
 
-## Long term
+## Userland?????????
- - Get rust lang to work/switch to rust
+ - Shell: input, execute
- - Shell?
+
- - Improve memory management
+ - prog/time: show time
+ - prog/date: show date
+ - prog/mem: show amount of memory
+ - prog/bitmap: show phys bitmap
+
+# Long term
+ - Rust?

bootloader/bios/memory.asm

@@ -1,49 +1,89 @@
 ; SRs to find memory size and leave it as a "note" for the kernel
 
-mmap_probe:		; literally just test the memory boundaries
+; mmap_probe:		; literally just test the memory boundaries
-	push eax
+; 	push eax
-	push ebx
+; 	push ebx
-	push edx
+; 	push edx
-	push ebp
+; 	push ebp
+; 
+; 	mov ebp, esi
+; 	add esi, 0x00000ff
+; 	and esi, ~0x00000ff
+; mmap_probe_addr:
+; 
+; mmap_probe_done:
 
-	mov ebp, esi
+e820_stats_addr equ 0x9820
-	add esi, 0x00000ff
-	and esi, ~0x00000ff
-mmap_probe_addr:
 
-mmap_probe_done:
+e820:
-
+	mov di, e820_stats_addr + 4
-mmap_e820:
-	mov di, 0x8004
 	mov ebx, 0	; Must be 0 
 	mov bp, 0	; entry count
 
 	mov eax, 0xe820	; function reg
 	mov edx, 'SMAP' ; function sig
 
-	; TODO: update es:di to e820_dt
 	mov [es:di + 20], dword 1	; fill
 	mov ecx, 24					; ask for 24 bytes
 	int 0x15					; Do the interupt
 
 	; carry flag = (un)supported function
-	jc mmap_e820_fail			; Try probing instead
+	jc e820_fail_unsup			; TODO: Try probing instead
 
 	cmp eax, edx				; eax should be = 'SMAP'
-	jne mmap_e820_fail			; if not then fail
+	jne e820_fail_smap			; if not then fail
 
-	test ebx, ebx
+	test ebx, ebx				; no entries
-	je mmap_e820_fail
+	je e820_fail_noent
 
-mmap_e820_fail:
+e820_lp:
-	stc
+	mov eax, 0xe820
+	mov [es:di + 20], dword 1
+	mov ecx, 24
+	int 0x15
+	jc e820_finish ; carry => finished -> save entry count
+
+e820_iter:
+	; skip 0 entries
+	jcxz e820_skip
+
+	; check resp
+	cmp cl, 20
+	jbe e820_ntxt
+
+	; check the ignore bit 
+	test byte [es:di + 20], 1
+	je e820_skip
+
+e820_ntxt:
+	mov ecx, [es:di + 8] ; lower mem length
+	; test for 0
+	or ecx, [es:di + 12] 
+	jz e820_skip
+
+	; next entry
+	inc bp
+	add di, 24
+
+e820_skip:
+	test ebx, ebx ; of ebx = 0 then complete
+	jne e820_lp
+
+e820_finish:
+	mov [e820_stats_addr], bp ; save entry count at e820_ent
+	clc
 	ret
 
-e820_dt_start:	
+e820_fail_unsup:
-	e820_low: dd 0
+	mov [e820_stats_addr], byte -1 
-	e820_high: dd 0
+	jmp e820_fail
-	e820_len_low: dd 0
+e820_fail_smap:
-	e820_len_high: dd 0
+	mov [e820_stats_addr], byte -2 
-	e820_type: dd 0
+	jmp e820_fail
-e820_dt_end:
+e820_fail_noent:
+	mov [e820_stats_addr], byte -3
+	jmp e820_fail
 
+e820_fail:
+	stc
+	ret

bootloader/bootloader.asm

@@ -5,7 +5,7 @@
 	mov [BOOT_DRIVE], dl
 
 	; Move the stack pointer somewhere safe
-	mov bp, 0x9000 ; move it to 0x9000
+	mov bp, 0xe000 
 	mov sp, bp
 
 	; Load kernel into memory
@@ -35,15 +35,15 @@
 ; Switching to PM
 [bits 16]
 pm_preinit:
-	call mmap_e820	; Map the physical memory
+	; Do stats before mode switch
-
+	call e820				; Map the physical memory
-	cli			; Switch interupts
 
+	; PM prep stuff
+	cli						; Switch interupts
 	lgdt [gdt_descriptor] 	; Tell the CPU about the GDT
-
+	mov eax, cr0			; Set first bit of the CR0 register
-	mov eax, cr0		; Set first bit of the CR0 register
+	or eax, 0x1				; to 1
-	or eax, 0x1			; to 1
+	mov cr0, eax			; Update the control register
-	mov cr0, eax		; Update the control register
 
 	; Initialize PM
 	jmp GDT_CODE_SEG:pm_init	

drivers/vga.c

@@ -16,9 +16,9 @@ void vga_init() {
 
 	// Clear screen
 	// clear_row(0);
-	clear_screen();
+	// clear_screen();
 
-	set_cursor_pos(0, 0);
+	//set_cursor_pos(0, 0);
 }
 
 /*

kernel/kernel.c

@@ -1,23 +1,76 @@
 #include "kernel.h"
 
+void print_kernel_motd() {
+	printalign("      ___  ____                           ", BANNER_COLOR, MIDDLE);
+	printalign("  ___ / _ \\/ ___|                           ", BANNER_COLOR, MIDDLE);
+	printalign(" / _ \\ | | \\___ \\                           ", BANNER_COLOR, MIDDLE);
+	printalign("|  __/ |_| |___) |    A x86 operating system,", BANNER_COLOR, MIDDLE);
+	printalign(" \\___|\\___/|____/     licenced under GPL-2.0", BANNER_COLOR, MIDDLE);
+
+	println("");
+	printalign("Fun fact: e = lim[h->0] (1+h)^(1/h)", DEFAULT_COLOR, MIDDLE);
+	printalign("Created by E. Almqvist", DEFAULT_COLOR, MIDDLE);
+	println("");
+}
+
+void print_kernel_stats() {
+	char* buf;
+	// Memory stats
+	print("MEMORY BITMAP: ", 0x0f);
+	buf = itoa(get_bitmap(), buf, 2);
+	println(buf, DEFAULT_COLOR);
+
+	println("");
+
+	println("BIOS E820", 0x0f);
+	print("Loaded Entries: ", DEFAULT_COLOR);
+	uint entries = get_phys_mem_size();
+	buf = itoa(entries, buf, 10);
+	println(buf, DEFAULT_COLOR);
+
+	print("Physical Memory Size: ");
+	println("?", DEFAULT_COLOR);
+
+	println("");
+
+	// VGA stats	
+	println("Display (VGA)", 0x0f);
+	print("Memory Range: ", DEFAULT_COLOR);
+	buf = itoa(VGA_ADDRESS, buf, 16);
+	print(buf, DEFAULT_COLOR);
+	print(" - ");
+	buf = itoa(VGA_ADDRESS_MAX, buf, 16);
+	println(buf, DEFAULT_COLOR);
+
+	print("Screen Dimensions: ", DEFAULT_COLOR);
+	buf = itoa(MAX_COLS, buf, 10);
+	print(buf, DEFAULT_COLOR);
+	print("x");
+	buf = itoa(MAX_ROWS, buf, 10);
+	println(buf, DEFAULT_COLOR);
+
+	uint ticks = 0;
+	while (true) {
+		set_cursor_pos(0, 20);
+		buf = itoa(ticks, buf, 10);
+		printalign(buf, 0x0f, MIDDLE);
+		++ticks;
+	}
+
+}
+
 void kernel_init() {
 	vga_init(); 	// Initialize the screen first
-			// i.e. clear the screen et cetera.
+					// i.e. clear the screen et cetera.
-
-	println("Kernel loaded", SUCCESS_COLOR);
 
 	// Allocate VGA memory range
 	pm_malloc_range(VGA_ADDRESS, VGA_ADDRESS_MAX, true); // force alloc the VGA range
-
 	// ENABLE PAGING 
 	// TODO: make this work
 	// enable_paging();
 
-	println("");
+	clear_screen();
-	char* title = "eOS - lim[h->0] (1+h)^(1/h) OS";
+	print_kernel_motd();
-	println(title, DEFAULT_COLOR);
+	print_kernel_stats();
-
-	char* subtitle = "A x86 operating system, licenced under GPL-2.0";
-	println(subtitle, DEFAULT_COLOR);
 
 }

kernel/kernel.h

@@ -1,11 +1,11 @@
-
 #include "memory.h"
 #include "paging.h"
 #include "../drivers/vga.h"
 #include "../lib/str.h"
 #include "../lib/conv.h"
 
-#define STATUS_TEXT_COLOR 0x0f
+#define BANNER_COLOR 0x0c
 
-void init();
+void print_kernel_motd();
-void display_status(char*, unsigned int); 
+void print_kernel_stats();
+void kernel_init();

kernel/memory.c

@@ -22,6 +22,17 @@
 
 static int bitmap = 0; 
 static uint last_block;
+
+uint get_phys_mem_size() {
+	// TODO: read actual mappings
+	uint entry_count = (uint) *BIOS_E820;
+	return entry_count;
+}
+
+int get_bitmap() {
+	return bitmap;
+}
+
 void mod_bitmap(uint bit, uint bflag) {
 	// create a bitmask that will be applied to the bitmap
 	int bitmask = 1 << bit;
@@ -31,7 +42,6 @@ void mod_bitmap(uint bit, uint bflag) {
 	bitmap = (((bitmap & ~bitmask)) | (bflag << bit));
 }
 
-
 pointer block_alloc(uint blockidx) {
 	int block_bflag;
 	block_bflag = CHECK_BITMAP(bitmap, blockidx);

kernel/memory.h

@@ -1,5 +1,7 @@
 #include "../lib/types.h"
 
+#define BIOS_E820 (char*)0x9820
+
 #define BLOCK_SIZE 1024 // 1 KiB
 #define MAX_BLOCK_COUNT 32 // placeholder
 #define MEMSIZE_TO_BLOCKS(n) ((n*1024)/BLOCK_SIZE)
@@ -11,6 +13,7 @@
 
 // void init_pmm(uint map_addr, uint bsize); // Initialize physical memory manager
 
+int get_bitmap();
 void mod_bitmap(uint bit, uint flag);
 
 pointer block_alloc(uint blockidx); // allocate a block
@@ -23,3 +26,5 @@ void pm_malloc_range(ulong start, ulong end, bool force); // allocate a range of
 
 pointer pm_malloc(uint block_count); // allocate some blocks
 void pm_free(int* p); // free a var (if allocated with pm_malloc)
+
+uint get_phys_mem_size(); // physical memory size with e820 left by the bootloader

lib/conv.c

@@ -1,18 +1,48 @@
 #include "conv.h"
 #include "../drivers/vga.h"
 
-char* int_to_str(int i, char* buf) {
+char* itoa( int value, char * str, int base ) {
-	ulong num = (ulong)i; // convert to ulong
+	char* rc;
-	uint len = ulong_len(num); // number of digits
+	char* ptr;
+	char* low;
 
-	*(buf+len) = '\0'; // add a "end-of-string" at the end
+	// Check for supported base.
+	if( base < 2 || base > 36 ) {
+		*str = '\0';
+		return str;
+	}
+	rc = ptr = str;
+
+	switch(base) {
+		case 16:
+			*ptr++ = '0';
+			*ptr++ = 'x';
+		case 10:
+			if(value < 0)
+				*ptr++ = '-';
+	}
+
+// 	if(value < 0 && base == 10 )  // sign
+// 		*ptr++ = '-';
+
+	// Remember where the numbers start.
+	low = ptr;
+
+	// The actual conversion.
+	do {
+		// Modulo is negative for negative value. This trick makes abs() unnecessary.
+		*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + value % base];
+		value /= base;
+	} while(value);
+
+	// Terminating the string.
+	*ptr-- = '\0';
 
-	int j;
+	// Invert the numbers.
-	for(j = 0; j < len; j++) { // iterate over each digit and assign it to the buffer
+	while ( low < ptr ) {
-		// super dangerous memory write 
+		char tmp = *low;
-		*(buf+j) = (char)(ndigit(num, len-1-j) + ASCII_OFFSET); // apply the ascii offset so that i becomes a char
+		*low++ = *ptr;
-		println(*(buf+j), 0xc0);
+		*ptr-- = tmp;
 	}
-	
+	return rc;
-	return buf;
 }

lib/conv.h

@@ -1,6 +1,4 @@
 #include "types.h"
 #include "util.h"
 
-#define ASCII_OFFSET 0x30
+char* itoa(int, char*, int);
-
-char* int_to_str(int i, char* buf);