start of 0.0.9 branch, using multiboot this time

1 files changed, 0 insertions, 277 deletions

diff --git a/src/bootloader.asm b/src/bootloader.asm
deleted file mode 100644
index f18750c..0000000
--- a/src/bootloader.asm
+++ /dev/null
@@ -1,277 +0,0 @@
-;Copyright 2019 Benji Dial
-
-;Permission to use, copy, modify, and/or distribute this
-;software for any purpose with or without fee is hereby
-;granted, provided that the above copyright notice and this
-;permission notice appear in all copies.
-
-;THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS
-;ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
-;IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
-;EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
-;INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-;WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-;WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
-;TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
-;USE OR PERFORMANCE OF THIS SOFTWARE.
-
-kload equ 0x0010_0000
-
-global_info:;0x0500 - 0x05ff (0x0515)
-.fat      equ 0x0500;dword - pointer
-.root_dir equ 0x0504;dword - pointer
-.low_mem  equ 0x0508;word  - usable memory from 0 to 1MiB in kiB
-.mid_mem  equ 0x050a;word  - usable memory from 1MiB to 16MiB in kiB
-.mem_used equ 0x050c;word  - used memory from 0 to 1MiB in kiB
-.kernel_s equ 0x050e;word  - kernel image length in kiB
-                    ;dword - kernel use
-.high_mem equ 0x0514;word  - usable memory from 16MiB up in 64s of kiB
-
-fat_header:;0x7c03 - 0x7c3d
-.oem_name            equ 0x7c03;mkfs.fat    -
-.bytes_per_sector    equ 0x7c0b;0x0200      -
-.sectors_per_cluster equ 0x7c0d;0x01        -
-.reserved_sectors    equ 0x7c0e;0x0002      - handled
-.n_fats              equ 0x7c10;0x01        -
-.root_dir_entries    equ 0x7c11;            -
-.n_sectors           equ 0x7c13;0x0b40      -
-.media_type          equ 0x7c15;            -
-.sectors_per_fat     equ 0x7c16;            - handled
-.sectors_per_track   equ 0x7c18;0x0012      -
-.sides               equ 0x7c1a;0x0002      -
-.hidden_sectors      equ 0x7c1c;0x0000_0000 -
-.long_sectors        equ 0x7c20;0x0000_0000 -
-.drive_number        equ 0x7c24;            - ignored, used as scratch for real drive number
-.flags               equ 0x7c25;            -
-.signature           equ 0x7c26;0x29        - errors on other values
-.id                  equ 0x7c27;            -
-.label               equ 0x7c2b;PORTLAND OS -
-.fs_type             equ 0x7c36;FAT12       - errors on other values
-
-error_codes:
-.bad_fat_header      equ 0o000
-.insufficient_memory equ 0o001
-.no_kernel           equ 0o002
-.kernel_too_big      equ 0o003
-
-org 0x7c3e
-bits 16
-
-  ;Enable A20 line
-  in al, 0x92
-  or al, 0x02
-  out 0x92, al
-
-  ;Load second sector of bootloader
-  mov ah, 0x42
-  mov si, dap
-  int 0x13
-
-  ;Check FAT signature
-  test byte [fat_header.signature], 0x29
-  jne bad_fat_header
-  test word [fat_header.fs_type], 0x4146;FA
-  jne bad_fat_header
-  test word [fat_header.fs_type + 2], 0x3154;T1
-  jne bad_fat_header
-  test word [fat_header.fs_type + 4], 0x2032;2
-  jne bad_fat_header
-  test word [fat_header.fs_type + 6], 0x2020;
-  jne bad_fat_header
-
-  ;Store boot drive ID for later
-  mov byte [fat_header.drive_number], dl
-
-memory:
-  ;Get available low memory
-  int 0x12
-  mov word [global_info.low_mem], ax
-  mov word [global_info.mem_used], 0x0020
-
-  ;Get available mid and high memory
-  xor dx, dx
-  mov ax, 0xe801
-  int 0x15
-  test dx, dx
-  jnz .got
-  mov cx, ax
-  mov dx, bx
-.got:
-  mov word [global_info.mid_mem], cx
-  mov word [global_info.high_mem], dx
-
-  ;Load FAT
-  mov ax, word [fat_header.reserved_sectors]
-  mov word [dap.start], ax
-  xor eax, eax
-  mov ax, word [fat_header.sectors_per_fat]
-  call load_low
-  mov dword [global_info.fat], ebx
-
-load_root:
-  ;Load root directory
-  mov ax, word [fat_header.sectors_per_fat]
-  xor dh, dh
-  mov dl, word [fat_header.n_fats]
-  mul dx
-  add ax, [fat_header.reserved_sectors]
-  jnc .no_inc
-  inc dx
-.no_inc:
-  mov word [dap.start], ax
-  mov word [dap.start + 2], dx
-  mov ax, word [fat_header.root_dir_entries]
-  shr ax, 4
-  call load_low
-  mov dword [global_info.root_dir], ebx
-
-  ;Calculate end of root directory
-  xor ecx, ecx
-  mov cx, word [fat_header.root_dir_entries]
-  shl ecx, 5
-  add ecx, ebx
-  jc insufficient_memory
-
-find_kernel:
-  mov eax, 0x6e72_656b;kern
-  mov edx, 0x2020_6c65;el
-.loop:
-  ;Check name
-  test dword [ebx], eax
-  jne .next
-  test dword [ebx + 4], edx
-  jne .next
-  test word [ebx + 8], 0x7973;sy
-  jne .next
-  test byte [ebx + 10], 0x73;s
-  je .found
-.next:
-  ;Next record
-  add ebx, 32
-  test ebx, ecx
-  jne .loop
-
-  ;Got to end of directory
-  mov dl, error_codes.no_kernel
-  jmp error
-
-  ;ebx is pointer to entry
-  ;word [ebx + 26] is first cluster
-  ;dword [ebx + 28] is size
-.found:
-  ;Save size for later
-  mov eax, dword [ebx + 28]
-  shr eax, 10
-  test eax, 0x003f_0000
-  jz .store_size
-  mov dl, error_codes.kernel_too_big
-  jmp error
-.store_size:
-  mov word [global_info.kernel_s], ax
-
-  ;Save sector number for later
-  mov cx, [ebx + 26]
-
-  ;find 1kiB buffer
-  mov ax, 2
-  mov byte [load_low.ret_with_segment], 0xc3;ret
-  call load_low
-  shl ebx, 4
-
-load_kernel:
-  
-
-load_low:
-  ;ax in : number of sectors
-  ;qword [dap.start] in : starting sector
-
-  ;Store length in DAP
-  mov word [dap.length], ax
-
-  ;Calculate kiB used
-  dec ax
-  shr ax, 1
-  inc ax
-  mov dx, ax
-  add ax, word [global_info.mem_usage]
-
-  ;Fail if not enough is available
-  jc insufficient_memory
-  cmp ax, word [global_info.low_mem]
-  jg insufficient_memory
-
-  ;Check if address will fit in DAP
-  test ah, ah
-  jnz insufficient_memory
-
-  ;Commit usage
-  mov word [global_info.low_mem_usage], ax
-
-  ;Put address into DAP
-  xor ebx, ebx
-  mov bh, al
-  shr bx, 2
-  mov word [dap.segment], bx
-  mov word [dap.offset], 0x0000
-.ret_with_segment:
-
-  ;Load from disk
-  mov si, dap
-  mov ah, 0x42
-  int 0x13
-  shl ebx, 4
-  ret
-
-bad_fat_header:
-  mov dl, error_codes.bad_fat_header
-  jmp error
-
-insufficient_memory:
-  mov dl, error_codes.insufficient_memory
-  jmp error
-
-error:
-  ;Print error code (in octal)
-  mov ax, 0xb800
-  mov ds, ax
-  mov word [0], 0x0f72;E
-  mov ax, 0x0f00
-  mov al, dl
-  and al, 0x07
-  or al, 0x30
-  mov word [6], ax;bottom digit
-  shr dl, 3
-  mov al, dl
-  and al, 0x07
-  or al, 0x30
-  mov word [4], ax;middle digit
-  shr dl, 3
-  mov al, dl
-  or al, 0x30
-  mov word [2], ax;top digit
-
-  cli
-.halt:
-  hlt
-  jmp .halt
-
-gdt:
-dw 0x28
-dd gdt + 6
-dq 0x0000_0000_0000_0000
-dq 0x0040_9a00_0000_7fff;0x000000 - 0x007fff
-dq 0x0040_9200_0000_7fff
-dq 0x00c0_9a00_8000_0ff7;0x008000 - 0xffffff
-dq 0x00c0_9200_8000_0ff7
-
-dap:
-dw 0x0010
-.length  dw 0x0001
-.offset  dw 0x7e00
-.segment dw 0x0000
-.start   dq 0x0000_0000_0000_0001
-
-memory_usage:
-.low  dw ;word - used memory from 0 to 1MiB in kiB
-.mid  dw 0x0000;word - used memory from 1MiB to 16MiB in kiB
-.high dw 0x0000;word - used memory from 16MiB up in 64s of kiB
\ No newline at end of file