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4361041d09
| Author | SHA1 | Date | |
|---|---|---|---|
 d0p1 🏳️⚧️
|
4361041d09 | ||
|
d0p1 🏳️⚧️
|
060c2835f6 |
|
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@ -9,7 +9,8 @@ STAGE0_SRCS = boot0.asm \
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STAGE1_SRCS = boot1.asm \
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const.inc \
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a20.inc
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a20.inc \
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multiboot.inc
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.PHONY: all
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all: $(TARGET)
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@ -27,3 +28,5 @@ clean:
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.PHONY: install
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install: $(TARGET)
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@ mkdir -p $(DESTDIR)
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install stpdboot.sys $(DESTDIR)
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@ -1,2 +1,33 @@
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#+TITLE: StupidOS Bootloader
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#+begin_src
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0x100000 +-----------------------+
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| |
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| Reserved |
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| |
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0x080000 +-----------------------+
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| |
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| Kernel preload |
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| |
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0x00F000 +-----------------------+
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| |
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| buffer |
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| |
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0x008000 +-----------------------+
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| |
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| Boot0 |
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| |
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0x007000 +-----------------------+
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| |
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| Real mode stack |
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| |
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0x006000 +-----------------------+
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| |
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| Boot1 |
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| |
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0x001000 +-----------------------+
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| Reserved (BIOS & IVT) |
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| |
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0x000000 +-----------------------+
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#+end_src
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@ -1,9 +1,18 @@
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INCLUDE 'const.inc'
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INCLUDE 'const.inc'
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INCLUDE 'multiboot.inc'
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ORG STAGE1_BASE
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USE16
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stage2:
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jmp _start
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mb_header MultibootHeader mb_header
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_start:
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cmp eax, MULTIBOOT_MAGIC
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je .multiboot
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;; non multiboot process
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push cs
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pop ds
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@ -13,9 +22,22 @@ stage2:
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call a20_enable
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jc .error_a20
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; detect memory
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call memory_get_map
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jc .error_memory
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xchg bx, bx
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call video_setup
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.multiboot:
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jmp .hang
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.error_memory:
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mov si, msg_error_memory
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jmp .error
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.error_a20:
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mov si, msg_error_a20
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.error:
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call bios_print
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.hang:
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hlt
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@ -23,6 +45,21 @@ stage2:
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INCLUDE 'a20.inc'
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INCLUDE 'utils.inc'
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INCLUDE 'memory.inc'
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INCLUDE 'video.inc'
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msg_stage2 db "StupidOS Bootloader (Stage 1)", 0x0D, 0x0A, 0
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msg_error_a20 db "ERROR: can't enable a20 line", 0x0D, 0x0A, 0
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msg_stage2 db "StupidOS Bootloader (Stage 1)", CR, LF, 0
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msg_error_a20 db "ERROR: can't enable a20 line", CR, LF, 0
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msg_error_memory db "ERROR: can't detect available memory", CR, LF, 0
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;;
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bi_screen_width: dw 0
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bi_screen_height: dw 0
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_edata:
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; BSS
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rb 0x4000
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_end:
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@ -1,5 +1,6 @@
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CR = 0x0D
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LF = 0x0A
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; -------- Address ----------
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STAGE0_BASE = 0x7C00
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STAGE1_BASE = 0x1000
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@ -7,3 +8,7 @@ DISK_BUFFER = 0x8000
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KERNEL_PRELOAD = 0xF000
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STACK_TOP = 0x7000
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; ---------- Video ------------
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VIDEO_WIDTH = 1024
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VIDEO_HEIGHT = 768
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VIDEO_DEPTH = 32
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28
boot/memory.inc
Normal file
28
boot/memory.inc
Normal file
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@ -0,0 +1,28 @@
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; 0xE820 Get System Memory Map
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; EAX=0x0000E820
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; EDX=0x534D4150
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; EBX=0x0 or continuation value
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; ECX=buffer size
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; ES:SI = buffer
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memory_do_E820:
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ret
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memory_get_map:
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call memory_do_E820
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jnc .end
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; try 0x88
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clc
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mov ah, 0x88
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int 0x15
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jc .error
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test ax, ax
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je .error
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.end:
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clc
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ret
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.error:
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stc
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ret
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@ -1,106 +1,107 @@
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MULTIBOOT_HDR_MAGIC = 0x1BADB002
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MULTIBOOT_MAGIC = 0x2BADB002
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MULTIBOOT_HDR_ALIGN = 0x1
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MULTIBOOT_HDR_MEMINFO = 0x2
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MULTIBOOT_HDR_VIDEO = 0x4
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struc MultibootHeader flags,addr,width,height,depth
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{
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.magic dd MULTIBOOT_HDR_MAGIC
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.flags dd flags
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.checksum dd -(MULTIBOOT_HDR_MAGIC + flags)
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; address fields (we'll just skip them)
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.header_addr dd addr
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.load_addr dd 0x100000
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.load_end_addr dd _edata - KBASE
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.bss_end_addr dd _end - KBASE
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.entry_addr dd _start
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; Video mode
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.mode_type dd 0x0
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.width dd width
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.height dd height
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.depth dd depth
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}
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struc MultibootData
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{
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.flags dd ?
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; if flags[0] is set
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.mem_lower dd ?
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.mem_upper dd ?
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; if flags[1] is set
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.boot_device dd ?
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; if flags[2] is set
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.cmdline dd ?
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; if flags[3] is set
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.mods_count dd ?
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.mods_addr dd ?
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; if flags[4] is set
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.syms dd 4 dup ?
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; if flags[6] is set
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.mmap_length dd ?
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.mmap_addr dd ?
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; if flags[7] is set
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.drives_length dd ?
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.drives_addr dd ?
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; if flags[8] is set
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.config_table dd ?
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; if flags[9] is set
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.bootloader_name dd ?
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; if flags[10] is set
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.apm_table dd ?
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; if flags[11] is set
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.vbe_control_info dd ?
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.vbe_mode_info dd ?
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.vbe_mode dw ?
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.vbe_if_seg dw ?
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.vbe_if_off dw ?
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.vbe_if_length dw ?
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; if flags[12] is set
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.fb_addr dq ?
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.fb_pitch dd ?
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.fb_width dd ?
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.fb_height dd ?
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.fb_bpp db ?
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.fb_type db ?
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.fb_misc dw 3 dup ?
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}
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MULTIBOOT_DATA_MEM = 0x0001
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MULTIBOOT_DATA_BOOTDEV = 0x0002
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MULTIBOOT_DATA_CMDLINE = 0x0004
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MULTIBOOT_DATA_MODULES = 0x0008
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MULTIBOOT_DATA_MMAP = 0x0040
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MULTIBOOT_DATA_DRIVES = 0x0080
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MULTIBOOT_DATA_BOOTLOADER_NAME = 0x0200
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MULTIBOOT_DATA_VBE = 0x0800
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MULTIBOOT_DATA_FB = 0x1000
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struc MultibootMMap
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{
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.size dd ?
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.addr dq ?
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.length dq ?
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.type dd ?
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}
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MULTIBOOT_MEMORY_AVAILABLE = 0x1
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MULTIBOOT_MEMORY_RESERVED = 0x2
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MULTIBOOT_MEMORY_ACPI = 0x3
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MULTIBOOT_MEMORY_NVS = 0x4
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MULTIBOOT_MEMORY_BADPARAM = 0x5
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MULTIBOOT_HDR_MAGIC = 0x1BADB002
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MULTIBOOT_MAGIC = 0x2BADB002
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MULTIBOOT_HDR_ALIGN = 0x1
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MULTIBOOT_HDR_MEMINFO = 0x2
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MULTIBOOT_HDR_VIDEO = 0x4
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MULTIBOOT_FLAGS = MULTIBOOT_HDR_ALIGN or MULTIBOOT_HDR_MEMINFO or MULTIBOOT_HDR_VIDEO
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struc MultibootHeader addr
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{
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.magic dd MULTIBOOT_HDR_MAGIC
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.flags dd MULTIBOOT_FLAGS
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.checksum dd -(MULTIBOOT_HDR_MAGIC + MULTIBOOT_FLAGS)
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; address fields (we'll just skip them)
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.header_addr dd addr
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.load_addr dd STAGE1_BASE
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.load_end_addr dd _edata - STAGE1_BASE
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.bss_end_addr dd _end - STAGE1_BASE
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.entry_addr dd _start
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; Video mode
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.mode_type dd 0x0
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.width dd VIDEO_WIDTH
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.height dd VIDEO_HEIGHT
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.depth dd VIDEO_DEPTH
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}
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struc MultibootData
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{
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.flags dd ?
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; if flags[0] is set
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.mem_lower dd ?
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.mem_upper dd ?
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; if flags[1] is set
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.boot_device dd ?
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; if flags[2] is set
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.cmdline dd ?
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; if flags[3] is set
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.mods_count dd ?
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.mods_addr dd ?
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; if flags[4] is set
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.syms dd 4 dup ?
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; if flags[6] is set
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.mmap_length dd ?
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.mmap_addr dd ?
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; if flags[7] is set
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.drives_length dd ?
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.drives_addr dd ?
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; if flags[8] is set
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.config_table dd ?
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; if flags[9] is set
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.bootloader_name dd ?
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; if flags[10] is set
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.apm_table dd ?
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; if flags[11] is set
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.vbe_control_info dd ?
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.vbe_mode_info dd ?
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.vbe_mode dw ?
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.vbe_if_seg dw ?
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.vbe_if_off dw ?
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.vbe_if_length dw ?
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; if flags[12] is set
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.fb_addr dq ?
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.fb_pitch dd ?
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.fb_width dd ?
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.fb_height dd ?
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.fb_bpp db ?
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.fb_type db ?
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.fb_misc dw 3 dup ?
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}
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MULTIBOOT_DATA_MEM = 0x0001
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MULTIBOOT_DATA_BOOTDEV = 0x0002
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MULTIBOOT_DATA_CMDLINE = 0x0004
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MULTIBOOT_DATA_MODULES = 0x0008
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MULTIBOOT_DATA_MMAP = 0x0040
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MULTIBOOT_DATA_DRIVES = 0x0080
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MULTIBOOT_DATA_BOOTLOADER_NAME = 0x0200
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MULTIBOOT_DATA_VBE = 0x0800
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MULTIBOOT_DATA_FB = 0x1000
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struc MultibootMMap
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{
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.size dd ?
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.addr dq ?
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.length dq ?
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.type dd ?
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}
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MULTIBOOT_MEMORY_AVAILABLE = 0x1
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MULTIBOOT_MEMORY_RESERVED = 0x2
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MULTIBOOT_MEMORY_ACPI = 0x3
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MULTIBOOT_MEMORY_NVS = 0x4
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MULTIBOOT_MEMORY_BADPARAM = 0x5
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3
boot/video.inc
Normal file
3
boot/video.inc
Normal file
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@ -0,0 +1,3 @@
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video_setup:
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ret
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@ -1,27 +1,25 @@
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AS = fasm
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RM = rm -f
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INSTALL = install
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KERNEL = vmstupid
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SRCS = kernel.asm \
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const.inc \
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boot/multiboot.inc \
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boot/boot.inc \
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mm/mm.inc
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.PHONY: all
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all: $(KERNEL)
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$(KERNEL): $(SRCS)
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$(AS) kernel.asm $@
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.PHONY: clean
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clean:
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$(RM) $(KERNEL)
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.PHONY: install
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install: $(KERNEL)
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@ mkdir -p $(DESTDIR)
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install $< $(DESTDIR)
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.PHONY: all clean
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AS = fasm
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RM = rm -f
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INSTALL = install
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KERNEL = vmstupid.sys
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SRCS = kernel.asm \
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const.inc \
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mm/mm.inc
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.PHONY: all
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all: $(KERNEL)
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$(KERNEL): $(SRCS)
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$(AS) kernel.asm $@
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.PHONY: clean
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clean:
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$(RM) $(KERNEL)
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.PHONY: install
|
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install: $(KERNEL)
|
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@ mkdir -p $(DESTDIR)
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install $< $(DESTDIR)
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.PHONY: all clean
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||||
|
|
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@ -1,35 +0,0 @@
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ORG 0x100000
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ALIGN 4
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USE32
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INCLUDE 'boot/multiboot.inc'
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INCLUDE 'const.inc'
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mb_header MultibootHeader MB_FLAGS, mb_header, VIDEO_WIDTH, VIDEO_HEIGHT, VIDEO_DEPTH
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_start:
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cli
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cmp eax, MULTIBOOT_MAGIC
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jne hang
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; iterate over memory
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;
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;
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xor esi, esi
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mov edi, kernel_page_table - KBASE
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mov ecx, kernel_page_directory - KBASE
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mov cr3, ecx
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mov ecx, cr0
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hang:
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||||
hlt
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jmp $-1
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||||
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||||
; SEGMENT readable writable
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||||
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||||
boot_struct dd 0x0
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||||
|
|
@ -1,53 +1,46 @@
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|||
KBASE = 0xC0000000
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PSIZE = 0x1000
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||||
; --------- VERSION -------------
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VERSION_MAJOR = 1
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VERSION_MINOR = 0
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||||
|
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; --------- BOOT PARAMS ---------
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MB_FLAGS = MULTIBOOT_HDR_ALIGN or MULTIBOOT_HDR_MEMINFO or MULTIBOOT_HDR_VIDEO
|
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VIDEO_WIDTH = 1024
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VIDEO_HEIGHT = 768
|
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VIDEO_DEPTH = 32
|
||||
|
||||
; --------- Registers ------------
|
||||
CR0_PE = 0x00000001
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CR0_MP = 0x00000002
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CR0_EM = 0x00000004
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CR0_TS = 0x00000008
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CR0_ET = 0x00000010
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CR0_NE = 0x00000020
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CR0_WP = 0x00010000
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CR0_AM = 0x00040000
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CR0_NW = 0x20000000
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CR0_CD = 0x40000000
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CR0_PG = 0x80000000
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||||
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CR3_PWT = 0x08
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CR3_PCD = 0x10
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||||
|
||||
CR4_VME = 0x0000001
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CR4_PVI = 0x0000002
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||||
CR4_TSD = 0x0000004
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||||
CR4_DE = 0x0000008
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||||
CR4_PSE = 0x0000010
|
||||
CR4_PAE = 0x0000020
|
||||
CR4_MCE = 0x0000040
|
||||
CR4_PGE = 0x0000080
|
||||
CR4_PCE = 0x0000100
|
||||
CR4_OSDXSR = 0x0000200
|
||||
CR4_OSXMMEXCPT = 0x0000400
|
||||
CR4_UMIP = 0x0000800
|
||||
CR4_VMXE = 0x0002000
|
||||
CR4_SMXE = 0x0004000
|
||||
CR4_FSGSBASE = 0x0010000
|
||||
CR4_PCIDE = 0x0020000
|
||||
CR4_OSXSAVE = 0x0040000
|
||||
CR4_SMEP = 0x0100000
|
||||
CR4_SMAP = 0x0200000
|
||||
CR4_PKE = 0x0400000
|
||||
CR4_CET = 0x0800000
|
||||
CR4_PKS = 0x1000000
|
||||
|
||||
KBASE = 0xC0000000
|
||||
PSIZE = 0x1000
|
||||
|
||||
; --------- VERSION -------------
|
||||
VERSION_MAJOR = 1
|
||||
VERSION_MINOR = 0
|
||||
|
||||
; --------- Registers ------------
|
||||
CR0_PE = 0x00000001
|
||||
CR0_MP = 0x00000002
|
||||
CR0_EM = 0x00000004
|
||||
CR0_TS = 0x00000008
|
||||
CR0_ET = 0x00000010
|
||||
CR0_NE = 0x00000020
|
||||
CR0_WP = 0x00010000
|
||||
CR0_AM = 0x00040000
|
||||
CR0_NW = 0x20000000
|
||||
CR0_CD = 0x40000000
|
||||
CR0_PG = 0x80000000
|
||||
|
||||
CR3_PWT = 0x08
|
||||
CR3_PCD = 0x10
|
||||
|
||||
CR4_VME = 0x0000001
|
||||
CR4_PVI = 0x0000002
|
||||
CR4_TSD = 0x0000004
|
||||
CR4_DE = 0x0000008
|
||||
CR4_PSE = 0x0000010
|
||||
CR4_PAE = 0x0000020
|
||||
CR4_MCE = 0x0000040
|
||||
CR4_PGE = 0x0000080
|
||||
CR4_PCE = 0x0000100
|
||||
CR4_OSDXSR = 0x0000200
|
||||
CR4_OSXMMEXCPT = 0x0000400
|
||||
CR4_UMIP = 0x0000800
|
||||
CR4_VMXE = 0x0002000
|
||||
CR4_SMXE = 0x0004000
|
||||
CR4_FSGSBASE = 0x0010000
|
||||
CR4_PCIDE = 0x0020000
|
||||
CR4_OSXSAVE = 0x0040000
|
||||
CR4_SMEP = 0x0100000
|
||||
CR4_SMAP = 0x0200000
|
||||
CR4_PKE = 0x0400000
|
||||
CR4_CET = 0x0800000
|
||||
CR4_PKS = 0x1000000
|
||||
|
||||
|
|
|
|||
|
|
@ -1,15 +1,18 @@
|
|||
INCLUDE 'boot/boot.inc'
|
||||
|
||||
ORG $ + KBASE
|
||||
|
||||
INCLUDE 'mm/mm.inc'
|
||||
|
||||
kmain:
|
||||
nop
|
||||
|
||||
_edata:
|
||||
|
||||
; BSS
|
||||
rb 0x4000
|
||||
|
||||
_end:
|
||||
INCLUDE 'const.inc'
|
||||
|
||||
ORG KBASE
|
||||
USE32
|
||||
|
||||
jmp kmain
|
||||
|
||||
INCLUDE 'mm/mm.inc'
|
||||
|
||||
kmain:
|
||||
nop
|
||||
|
||||
_edata:
|
||||
|
||||
; BSS
|
||||
rb 0x4000
|
||||
|
||||
_end:
|
||||
|
|
|
|||
114
tools/fat.c
114
tools/fat.c
|
|
@ -32,7 +32,24 @@ typedef struct
|
|||
uint8_t fs_type[8];
|
||||
} __attribute__((packed)) BiosParamBlock;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
uint8_t name[8];
|
||||
uint8_t ext[3];
|
||||
uint8_t attr;
|
||||
uint16_t reserved0;
|
||||
uint16_t creation_time;
|
||||
uint16_t creation_date;
|
||||
uint16_t access_date;
|
||||
uint16_t reserved1;
|
||||
uint16_t mod_time;
|
||||
uint16_t mod_date;
|
||||
uint16_t start;
|
||||
uint32_t size;
|
||||
} __attribute__((packed)) Entry;
|
||||
|
||||
static const char *prg_name;
|
||||
static int sector_size = 512;
|
||||
|
||||
static void
|
||||
fatal(const char *str, ...)
|
||||
|
|
@ -48,27 +65,104 @@ fatal(const char *str, ...)
|
|||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
static void
|
||||
read_sector(uint8_t *dest, int sect, FILE *fp)
|
||||
{
|
||||
if (fseek(fp, sect*sector_size, SEEK_SET) != 0) goto fatal_sect;
|
||||
if (fread(dest, 1, sector_size, fp) != sector_size) goto fatal_sect;
|
||||
|
||||
return;
|
||||
|
||||
fatal_sect:
|
||||
fatal("Can't read sector %d", sect);
|
||||
}
|
||||
|
||||
static void
|
||||
dump_bpb(BiosParamBlock *bpb)
|
||||
{
|
||||
char label[12];
|
||||
|
||||
printf("Bytes per logical sector: %hd\n", bpb->bytes_per_sector);
|
||||
sector_size = bpb->bytes_per_sector;
|
||||
printf("Logical sectors per cluster: %d\n", bpb->sectors_per_cluster);
|
||||
printf("Reserved logical sectors: %hd\n", bpb->reserved_sectors);
|
||||
printf("Number of FATs: %d\n", bpb->number_of_FATs);
|
||||
printf("Root directory entries: %hd\n", bpb->root_entries);
|
||||
printf("Total logical sectors: %hd\n", bpb->logical_sectors);
|
||||
printf("Logical sectors per FAT: %hd\n", bpb->sectors_per_FAT);
|
||||
printf("Serial: %X\n", bpb->serial);
|
||||
memset(label, 0, 12);
|
||||
strncpy(label, bpb->label, 11);
|
||||
printf("Label: '%s'\n", label);
|
||||
printf("signature: %X\n", bpb->signature);
|
||||
}
|
||||
|
||||
static void
|
||||
dump_entry(Entry *entry)
|
||||
{
|
||||
char filename[9];
|
||||
char ext[4];
|
||||
int i;
|
||||
|
||||
if (entry->name[0] == 0x0) return;
|
||||
|
||||
memset(filename, 0, 9);
|
||||
strncpy(filename, entry->name, 8);
|
||||
memset(ext, 0, 4);
|
||||
strncpy(ext, entry->ext, 3);
|
||||
for (i = 7; i > 0; i--)
|
||||
{
|
||||
if (filename[i] == ' ')
|
||||
{
|
||||
filename[i] = '\0';
|
||||
}
|
||||
else
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
printf("%s.%s\n", filename, ext);
|
||||
}
|
||||
|
||||
static void
|
||||
dump(const char *img)
|
||||
{
|
||||
FILE *fp;
|
||||
BiosParamBlock bpb;
|
||||
char label[12];
|
||||
BiosParamBlock *bpb;
|
||||
uint8_t buffer[512];
|
||||
int root_start;
|
||||
int root_size;
|
||||
int i;
|
||||
int j;
|
||||
|
||||
fp = fopen(img, "rb");
|
||||
if (fp == NULL) fatal("Can't open '%s': %s", img, strerror(errno));
|
||||
|
||||
if (fread(&bpb, 1, sizeof(BiosParamBlock), fp) != sizeof(BiosParamBlock))
|
||||
read_sector(buffer, 0, fp);
|
||||
if (buffer[511] != 0xAA || buffer[510] != 0x55)
|
||||
{
|
||||
fatal("Can't read BPB");
|
||||
fatal("MBR not found");
|
||||
}
|
||||
|
||||
bpb = (BiosParamBlock *)buffer;
|
||||
|
||||
dump_bpb(bpb);
|
||||
|
||||
root_start = bpb->sectors_per_FAT * bpb->number_of_FATs;
|
||||
root_start += bpb->reserved_sectors;
|
||||
|
||||
root_size = bpb->root_entries / (sector_size >> 0x5);
|
||||
|
||||
for (i = 0; i < root_size; i++)
|
||||
{
|
||||
read_sector(buffer, root_start + i, fp);
|
||||
for (j = 0; j < sector_size; j+=32)
|
||||
{
|
||||
dump_entry((Entry *)(buffer + j));
|
||||
}
|
||||
}
|
||||
|
||||
printf("Bytes per logical sector: %hd\n", bpb.bytes_per_sector);
|
||||
printf("Logical sectors per cluster: %d\n", bpb.sectors_per_cluster);
|
||||
memset(label, 0, 12);
|
||||
strncpy(label, bpb.label, 11);
|
||||
printf("Label: '%s'\n", label);
|
||||
printf("signature: %X\n", bpb.signature);
|
||||
fclose(fp);
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue