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rusya
2025-05-10 15:48:10 +03:00
parent b836a37264
commit d4a14633ce
4 changed files with 89 additions and 90 deletions
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src/boot.asm
+70 -73
View File
@@ -1,5 +1,10 @@
bits 32
%define MULTIBOOT_PAGE_ALIGN 0x00000001
%define MULTIBOOT_MEMORY_INFO 0x00000002
%define MULTIBOOT_HEADER_MAGIC 0x1BADB002
%define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO)
%define CR0_MP 0x00000002 /* bit 01 -> enable monitor coprocessor */
%define CR0_NE 0x00000020 /* bit 05 -> enable native x87 FPU mode */
%define CR0_WP 0x00010000 /* bit 16 -> enable write protect (for CoW) */
@@ -9,89 +14,85 @@ bits 32
%define PAGE_OFFSET 0xC0000000
%define GDT_BASE (0xFFFFFFFF - (PAGE_OFFSET - 1))
section .setup
%define KERNEL_CS 0x8
%define KERNEL_DS 0x10
section .setup
align 4
tmp_gdtr:
dw ((3 * 8) - 1)
dw ((3 * 8) - 1)
tmp_gdta:
dd tmp_gdt
dd tmp_gdt
align 4
tmp_gdt:
; null entry
dw 0x0000
dw 0x0000
dw 0x0000
dw 0x0000
; NULL DESCRIPTOR
dw 0x0000
dw 0x0000
dw 0x0000
dw 0x0000
; /* KERNEL CODE */
dw 0xFFFF ; /* segment limit 15-00 */
dw 0x0000 ; /* base address 15-00 */
db 0x00 ; /* base address 23-16 */
db 0x9A ; /* P=1 DPL=00 S=1 TYPE=1010 (exec/read) */
db 0xCF ; /* G=1 DB=1 0=0 AVL=0 SEGLIM=1111 */
db GDT_BASE >> 24 ; /* base address 31-24 */
; KERNEL CODE
dw 0xFFFF ; segment limit 15-00
dw 0x0000 ; base address 15-00
db 0x00 ; base address 23-16
db 0x9A ; P=1 DPL=00 S=1 TYPE=1010 (exec/read)
db 0xCF ; G=1 DB=1 0=0 AVL=0 SEGLIM=1111
db (GDT_BASE >> 24) ; base address 31-24 (0x40)
; /* KERNEL DATA */
dw 0xFFFF ; /* segment limit 15-00 */
dw 0x0000 ; /* base address 15-00 */
db 0x00 ; /* base address 23-16 */
db 0x92 ; /* P=1 DPL=00 S=1 TYPE=0010 (read/write) */
db 0xCF ; /* G=1 DB=1 0=0 AVL=0 SEGLIM=1111 */
db GDT_BASE >> 24 ; /* base address 31-24 */
; KERNEL DATA
dw 0xFFFF ; segment limit 15-00
dw 0x0000 ; base address 15-00
db 0x00 ; base address 23-16
db 0x92 ; P=1 DPL=00 S=1 TYPE=0010 (read/write)
db 0xCF ; G=1 DB=1 0=0 AVL=0 SEGLIM=1111
db (GDT_BASE >> 24) ; base address 31-24 (0x40)
align 4
multiboot_header:
dd 0x1BADB002
dd 0x00
dd - (0x1BADB002 + 0x00)
dd MULTIBOOT_HEADER_MAGIC
dd MULTIBOOT_HEADER_FLAGS
dd -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
dd 0 ; header_addr
dd 0 ; load_addr
dd 0 ; load_end_addr
dd 0 ; bss_end_addr
dd 0 ; entry_addr
dd 0 ; mode_type
dd 0 ; width
dd 0 ; height
dd 0 ; depth
dd 0
dd 0
dd 0
dd 0
dd 0
dd 0
dd 0
dd 0
dd 0
section .text
global _start
; section .text
global start:function (start.end - start)
extern kmain ; this function is gonna be located in our c code(kernel.c)
extern get_last_boot_addr
extern gdt_init
extern bss_init
extern setup_tmp_pgdir
extern bss_init
extern gdt_init
extern get_last_boot_addr
extern kmain
_start:
cli
lgdt [tmp_gdtr] ; load GDTR with the temporary GDT
mov cx, KERNEL_DS
mov ds, cx
mov es, cx
mov fs, cx
mov gs, cx
mov ss, cx
jmp KERNEL_CS:setup_kernel
align 4
start:
; mov esp, stack_top
cli
; push ebx ; Сохраняем оригинальный ebx (указатель Multiboot)
;lgdt [gdt]
lgdt [tmp_gdtr]
mov cx, 0x10 ; data segment
mov ds, cx
mov es, cx
mov fs, cx
mov gs, cx
mov ss, cx
jmp 0x8:.huita ; 0x8 - code segment
.text
align 4
.huita:
mov esp, PAGE_OFFSET + 0x10000 ; default stack address
push 0
popf ; reset EFLAGS
global setup_kernel
setup_kernel:
mov esp, PAGE_OFFSET + 0x10000 ; default stack address (0xC0000000 + 0x10000)
push 0 ; reset EFLAGS
popf
push ebx ; save Multiboot info structure
push eax ; save Multiboot magic value
call setup_tmp_pgdir
mov cr3, eax
@@ -101,22 +102,18 @@ align 4
or eax, 0x40000 ; CR0_AM ; enable AM
or eax, 0x10000 ; CR0_WP ; enable WP
or eax, 0x20 ; CR0_NE ; enable NE
or eax, 0x2 ; CR0_MP ; enable MP
or eax, 0x02 ; CR0_MP ; enable MP
mov cr0, eax
call bss_init ; initialize BSS segment
call gdt_init ; setup and load definitive GDT
call gdt_init ; setup and load the definitive GDT
call get_last_boot_addr
pop ecx ; restore Multiboot magic value
pop ebx ; restore Multiboot info structure
push eax ; save last boot address
push eax ; save the last boot address
push ebx ; save Multiboot info structure
push ecx ; save Multiboot magic value
pop ebx ; Восстанавливаем оригинальный ebx
push ebx ; Передаем его в kmain
call kmain
hlt
.end:
jmp $
src/drivers/fat.c
+3 -3
View File
@@ -149,9 +149,9 @@ static void fmt_put(char** buf, char* end, char c)
}
//------------------------------------------------------------------------------
static void fmt_put_num(long long val, int flags, int width, char** buf, char* end)
static void fmt_put_num(long val, int flags, int width, char** buf, char* end)
{
unsigned long long uval = (unsigned long long)val;
unsigned long uval = (unsigned long)val;
int size = 0;
char tmp[65]; // Binary digits in uint64_t plus sign
@@ -162,7 +162,7 @@ static void fmt_put_num(long long val, int flags, int width, char** buf, char* e
if (!(flags & FMT_UNSIGNED) && val < 0)
{
uval = (unsigned long long)-val;
uval = (unsigned long)-val;
if (!(flags & FMT_NO_SIGN))
sign = '-';
}