more refactoring
pantonshire
8 months ago
parent
909875ec5b
commit
2219fac4e5
@ -1,270 +0,0 @@
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; MEMORY LAYOUT
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; R = reserved, U = usable
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; --------------------------------------------------------------------
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; R | 0x000000 - 0x000400: real-mode interrupt vector table
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; R | 0x000400 - 0x000500: bios data area
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; U | 0x000500 - 0x004000: main stack
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; U | 0x004000 - 0x006a00: globals
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; U | 0x006a00 - 0x007c00: memory map
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; U | 0x007c00 - 0x007e00: boot sector
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; U | 0x007e00 - 0x080000: conventional usable memory
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; R | 0x080000 - 0x0a0000: extended bios data area (maximum possible size)
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; R | 0x0a0000 - 0x0c0000: video memory
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; R | 0x0c0000 - 0x0c8000: video bios
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; R | 0x0c8000 - 0x0f0000: bios expansions
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; R | 0x0f0000 - 0x100000: motherboard bios
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%include "defines.s"
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; BIOS puts our boot sector at 0000:7c00
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[org BOOT0_LOADPOINT]
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; We're (probably) in real mode
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[bits 16]
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main:
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; Disable interrupts
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cli
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xor ax, ax
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mov ds, ax
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mov es, ax
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; Put the stack base at 0x4000.
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; Stack grows high->low, so we'll grow away from our globals and program text.
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mov ss, ax
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mov bp, STACK_BASE
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mov sp, bp
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; Segment for VGA (0xb800 * 16 = 0xb8000)
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mov ax, 0xb800
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mov fs, ax
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; Set VGA mode
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; https://mendelson.org/wpdos/videomodes.txt
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mov ax, 0x0003
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int 0x10
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; Store boot drive number
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xor dh, dh
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push dx
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; Get drive geometry
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mov di, 0x00
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mov ah, 0x08
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int 0x13
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jc panic
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; Load sectors per track into cx & spill
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and cl, 0x3f
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xor ch, ch
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push cx
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; Load number of heads into bx & spill
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movzx bx, dh
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inc bx
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push bx
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; Load LBA 1.
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mov ax, 1
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mov bx, 0x7e00
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call read_lba
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; Check the GPT header magic "EFI PART"
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mov cx, GPT_MAGIC_LEN
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mov si, gpt_magic
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mov di, 0x7e00
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repe cmpsb
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jne panic
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; Ensure the 8-byte GPT starting LBA fits in 16 bits
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mov di, 0x7e00 ; The rep increments di so we need to reset it
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mov eax, [di + 0x4c]
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mov bx, [di + 0x4a]
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or ax, bx
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or eax, eax
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jnz panic
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; Store the first 16 bits of the GPT starting LBA (we have made sure the remaining bits are 0)
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push word [di + 0x48]
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; Load number of partitions
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mov ax, [di + 0x50]
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mov bx, [di + 0x52]
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or bx, bx
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jz .gpt_n_partitions_loaded
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; Number of partitions overflows 16 bits, so we just concern ourselves with the first 65535.
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; That's an awful lot of partitions anyway.
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mov ax, 0xffff
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.gpt_n_partitions_loaded:
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push ax
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; Load GPT entry size
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mov eax, [di + 0x54] ; Operand size override otherwise this is going to be painful
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mov ebx, eax
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; Assert that the entry size is 128 * 2^n for some integer n>=0. This is required for a valid GPT
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; and has the nice properties that:
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; - If each entry is larger than a sector (512 bytes), they'll be sector-aligned.
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; - If each entry is smaller than a sector, an integer number of them will fit into a sector.
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or eax, eax ; Test size != 0 because 128 * 2^n != 0
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jz panic
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test eax, 127 ; Test size is a multiple of 128
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jnz panic
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; Use the (n & (n - 1)) == 0 trick to test if the entry size is a power of 2. Since we already
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; know it's a nonzero multiple of 128, if size is a power of 2 then size = 128 * 2^n holds.
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; Therefore we don't need to bother dividing by 128 first (shr 7), which saves a couple of bytes.
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mov ecx, ebx
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dec ecx
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and ecx, eax
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jnz panic
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; Find the "sector stride", which is the number of sectors we increment by each time we want to
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; load a new entry.
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shr eax, 9 ; Divide by sector size to get sectors per entry
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cmp eax, 0xffff ; Make sure sectors per entry fits in 16 bits
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ja panic
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or ax, ax
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jnz .gpt_sector_stride_loaded
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; Sector stride must be at least one or we'll load the same sector each time!
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inc ax
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.gpt_sector_stride_loaded:
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push ax
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; Find the "byte stride", which is the number of bytes we increment by each time we want to load
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; the next entry in the same sector.
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cmp ebx, 512
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jb .gpt_find_entries_per_sector
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push word 0 ; Arbitrary byte stride since there's only one entry per sector
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push word 1 ; 1 entry per sector, since an entry is larger than a sector
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jmp .gpt_found_entries_per_sector
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.gpt_find_entries_per_sector:
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push bx ; Store byte stride = entry length in this case
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xor dx, dx
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mov ax, 512
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div bx ; Find entries per sector
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push ax
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.gpt_found_entries_per_sector:
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; Set up stack variables for our second stage search loop.
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xor ax, ax
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push ax ; Current entry
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push ax ; Current entry within the current sector
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push ax ; Number of sectors loaded
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push word [bp - GPT_ENTRIES_START_LBA] ; Current LBA
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; Search for the partition storing our second stage.
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.loop_find_stage2:
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mov dx, [bp - GPT_CURRENT_ENTRY_IDX]
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cmp [bp - GPT_N_ENTRIES_16], dx
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; Panic if we've run out of partitions and haven't found the second stage yet.
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jbe panic
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; If we haven't loaded any sectors yet, load the first one.
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cmp word [bp - GPT_SECTORS_LOADED], 0
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je .load_first_lba
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; If there's still more entries in the current sector, skip loading a new sector
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mov ax, [bp - GPT_SECTOR_ENTRY_IDX] ; Load current entry index within the current sector
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cmp [bp - GPT_ENTRIES_PER_SECTOR], ax ; Compare to entries per sector
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ja .process_current_entry
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mov ax, [bp - GPT_SECTOR_STRIDE] ; Load sector stride
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add word [bp - GPT_CURRENT_LBA], ax ; Increment current LBA by sector stride
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mov word [bp - GPT_SECTOR_ENTRY_IDX], 0 ; Reset the current entry index within the current sector
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.load_first_lba:
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; Read the current LBA to 0x8000 (just past the end of the GPT header)
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mov ax, [bp - GPT_CURRENT_LBA]
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mov bx, 0x8000
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call read_lba
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; Increment number of sectors loaded
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inc word [bp - GPT_SECTORS_LOADED]
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.process_current_entry:
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; Calculate the address of the current GPT entry.
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mov ax, [bp - GPT_SECTOR_ENTRY_IDX] ; Load current entry index within current sector
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xor dx, dx
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mul word [bp - GPT_BYTE_STRIDE] ; Get the byte offset in the current sector of the current entry
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add ax, 0x8000 ; Convert offset to address (we loaded the sector at 0x8000)
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; Compare entry GUID to our stage 2 partition GUID.
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mov cx, GUID_LEN
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mov si, guid_stage2
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mov di, ax
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repe cmpsb
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je .found_stage2
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; Next iteration
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inc word [bp - GPT_CURRENT_ENTRY_IDX] ; Increment current entry index
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inc word [bp - GPT_SECTOR_ENTRY_IDX] ; Increment current entry index within the current sector
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jmp .loop_find_stage2
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.found_stage2:
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push ax ; Address of the GPT entry for stage 2
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mov si, ax
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; Load partition LBA start.
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mov eax, [si + 0x20]
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mov ebx, [si + 0x24]
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; Ensure it fits in 16 bits.
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or ebx, ebx
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jnz panic
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cmp ebx, 0xffff
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ja panic
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; Load partition LBA end.
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mov ecx, [si + 0x28]
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mov edx, [si + 0x2c]
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; Assert that the end LBA is greater than or equal to the start LBA, so we have at least one
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; sector to load (end LBA is inclusive).
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or edx, edx
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jnz .stage2_end_lba_ok
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cmp eax, ecx
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ja panic
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.stage2_end_lba_ok:
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mov bx, BOOT1_LOADPOINT
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call read_lba
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jmp bx
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; Load a single boot disk sector. Panic on failure.
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; Inputs:
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; - ax: LBA to load
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; - bx: address to read sector to
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; Clobber: ax, cx, dx
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read_lba:
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; sector - 1 = LBA % sectors_per_track
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; temp = LBA / sectors_per_track
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; head = temp % n_heads
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; cylinder = temp / n_heads
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xor dx, dx
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; Divide by sectors per track. dx = mod (sector - 1), ax = div (temp)
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div word [bp - SECTORS_PER_TRACK]
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; Put the sector into cx (the bios call will use cl)
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mov cx, dx
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inc cx
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xor dx, dx
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; Divide by number of heads. dx = mod (head), ax = div (cylinder)
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div word [bp - N_HEADS]
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mov dh, dl
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mov ch, al
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mov dl, byte [bp - BOOT_DRIVE]
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mov ah, 0x02
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mov al, 1
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; Read sector
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int 0x13
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jc panic
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ret
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panic:
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mov ax, 0x0003
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int 0x10
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mov word fs:[0x0000], 0x4f21
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hlt
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gpt_magic db "EFI PART"
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GPT_MAGIC_LEN equ $ - gpt_magic
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; Our stage2 guid: fdffea69-3651-442f-a11d-88a09bf372dd
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guid_stage2 db 0x69, 0xea, 0xff, 0xfd, 0x51, 0x36, 0x2f, 0x44, \
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0xa1, 0x1d, 0x88, 0xa0, 0x9b, 0xf3, 0x72, 0xdd
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GUID_LEN equ $ - guid_stage2
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; MBR bootstrap field is 440 bytes long
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%if ($ - $$) > 440
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%error "exceeded mbr bootstrap field size"
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%endif
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@ -0,0 +1 @@
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/target
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@ -0,0 +1,6 @@
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[package]
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name = "stage_3"
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version = "0.1.0"
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edition = "2024"
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[dependencies]
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@ -0,0 +1,213 @@
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use std::{env, ffi::{OsStr, OsString}, fmt, fs, io, path::{Path, PathBuf}, process::{self, Command}};
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fn main() {
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let out_dir = env::var_os("OUT_DIR")
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.expect("OUT_DIR not set");
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let out_dir = PathBuf::from(out_dir);
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let search_path = SearchPath::load();
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let nasm_path = search_path.search("nasm")
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.next()
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.expect("failed to find nasm in PATH");
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let nasm = Nasm::new(nasm_path);
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build_asm(&nasm, &out_dir);
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emit_link_args();
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rerun_if_changed("build.rs".as_ref());
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}
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fn emit_link_args() {
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let linker_script_path = "link.ld";
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println!("cargo::rustc-link-arg=-T{}", linker_script_path);
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rerun_if_changed(linker_script_path.as_ref());
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}
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fn rerun_if_changed(path: &Path) {
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let path_str = path.to_str()
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.expect("expected path to be valid utf8");
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println!("cargo::rerun-if-changed={}", path_str);
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}
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fn link_obj(path: &Path) {
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let path_str = path.to_str()
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.expect("expected path to be valid utf8");
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println!("cargo::rustc-link-arg={}", path_str);
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}
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fn build_asm(nasm: &Nasm, out_dir: &Path) {
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let asm_srcs = fs::read_dir("src/asm")
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.expect("failed to get asm sources");
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for asm_src in asm_srcs {
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let asm_src = asm_src.expect("failed to get asm source");
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let ty = asm_src.file_type().expect("failed to get file type");
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if !ty.is_file() {
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continue;
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}
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let src_path = asm_src.path();
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let is_asm = src_path
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.extension()
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.map(|ext| ext == "s")
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.unwrap_or(false);
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if !is_asm {
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continue;
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}
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let out_filename = src_path
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.file_name()
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.unwrap()
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.apply(PathBuf::from)
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.with_extension("o");
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let out_path = out_dir.join(out_filename);
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nasm.assemble(
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&out_path,
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&[&src_path],
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&["../include".as_ref()]
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).expect("failed to assemble");
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link_obj(&out_path);
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}
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}
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struct Nasm {
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bin_path: PathBuf,
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}
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impl Nasm {
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fn new(bin_path: PathBuf) -> Self {
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Self { bin_path }
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}
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fn assemble(&self, output: &Path, sources: &[&Path], includes: &[&Path]) -> Result<(), CmdError>
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{
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for source in sources {
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rerun_if_changed(source);
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}
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let mut cmd = Command::new(&self.bin_path);
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cmd
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.arg("-Werror")
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.arg("-f")
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.arg("elf");
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for include in includes {
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let mut buf = OsString::new();
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buf.push("-I");
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buf.push(include);
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cmd.arg(buf);
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}
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cmd
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.arg("-o")
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.arg(output)
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.args(sources);
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run_cmd(&mut cmd)?;
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Ok(())
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}
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}
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struct SearchPath {
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paths: Vec<PathBuf>
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}
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impl SearchPath {
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fn load() -> Self {
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let path_var = env::var_os("PATH").unwrap_or_default();
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let paths = env::split_paths(&path_var).collect();
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Self { paths }
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}
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fn search<'a, 'b, 'c, T>(&'a self, bin: &'b T) -> impl Iterator<Item = PathBuf> + 'c
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where
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'a: 'c,
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'b: 'c,
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T: AsRef<OsStr> + ?Sized,
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{
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let bin = bin.as_ref();
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self.paths
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.iter()
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.filter_map(move |path| {
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let path = path.join(bin);
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fs::metadata(&path)
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.ok()
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.and_then(|meta| if meta.is_file() || meta.is_symlink() {
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Some(path)
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} else {
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None
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})
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})
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}
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}
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fn run_cmd(cmd: &mut Command) -> Result<process::Output, CmdError> {
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use fmt::Write;
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cmd
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.output()
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.map_err(CmdErrorKind::Io)
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.and_then(|out| if out.status.success() {
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Ok(out)
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} else {
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Err(CmdErrorKind::Status(out))
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})
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.map_err(|err| {
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let mut cmd_buf = String::new();
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write!(&mut cmd_buf, "{:?}", cmd).ok();
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CmdError::new(cmd_buf, err)
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})
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}
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#[derive(Debug)]
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struct CmdError {
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cmd: String,
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kind: CmdErrorKind,
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}
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impl CmdError {
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fn new(cmd: String, kind: CmdErrorKind) -> Self {
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Self { cmd, kind }
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}
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}
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impl fmt::Display for CmdError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "`{}` failed: ", self.cmd)?;
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match &self.kind {
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CmdErrorKind::Io(err) => err.fmt(f),
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CmdErrorKind::Status(out) => write!(f, "exited with status {}", out.status),
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}
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}
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}
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#[derive(Debug)]
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enum CmdErrorKind {
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Io(io::Error),
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Status(process::Output),
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}
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trait Apply: Sized {
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fn apply<T, F>(self, f: F) -> T
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where
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F: FnOnce(Self) -> T;
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}
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impl<U> Apply for U
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where
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U: Sized,
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{
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fn apply<T, F>(self, f: F) -> T
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where
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F: FnOnce(Self) -> T
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{
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f(self)
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,25 @@
|
||||
OUTPUT_FORMAT("binary")
|
||||
|
||||
. = 0x10000;
|
||||
|
||||
SECTIONS {
|
||||
.text : {
|
||||
*(.text)
|
||||
*(.text.*)
|
||||
}
|
||||
|
||||
.data : {
|
||||
*(.data)
|
||||
*(.data.*)
|
||||
}
|
||||
|
||||
.bss : {
|
||||
*(.bss)
|
||||
*(.bss.*)
|
||||
}
|
||||
|
||||
.rodata : {
|
||||
*(.rodata)
|
||||
*(.rodata.*)
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,8 @@
|
||||
section .text
|
||||
|
||||
[bits 32]
|
||||
|
||||
; TODO: reference sysv abi spec to see what we can mangle and what we must preserve
|
||||
load_sector:
|
||||
ret
|
||||
|
||||
Binary file not shown.
Binary file not shown.
Binary file not shown.
@ -1,14 +0,0 @@
|
||||
[package]
|
||||
name = "s4"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[lib]
|
||||
crate-type = ["staticlib"]
|
||||
|
||||
[profile.release]
|
||||
opt-level = "s"
|
||||
debug = 0
|
||||
|
||||
[dependencies]
|
||||
|
||||
@ -0,0 +1 @@
|
||||
/target
|
||||
@ -0,0 +1,6 @@
|
||||
[package]
|
||||
name = "xtask"
|
||||
version = "0.1.0"
|
||||
edition = "2024"
|
||||
|
||||
[dependencies]
|
||||
@ -0,0 +1,83 @@
|
||||
use std::{env, error::Error, fmt, path::{Path, PathBuf}, process::ExitCode};
|
||||
|
||||
mod mkimg;
|
||||
|
||||
fn main() -> ExitCode {
|
||||
match xtask() {
|
||||
Ok(()) => ExitCode::SUCCESS,
|
||||
Err(err) => {
|
||||
eprintln!("{}", err);
|
||||
ExitCode::FAILURE
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn xtask() -> Result<(), XtaskError> {
|
||||
let mut args = env::args_os().skip(1);
|
||||
|
||||
let task = args
|
||||
.next()
|
||||
.ok_or_else(|| XtaskError::with_message("no task provided".to_owned()))?;
|
||||
|
||||
let task = task.to_str().ok_or_else(|| {
|
||||
XtaskError::with_message(format!("invalid utf-8 \"{}\"", task.to_string_lossy()))
|
||||
})?;
|
||||
|
||||
let manifest_dir = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").ok_or_else(|| {
|
||||
XtaskError::with_message("CARGO_MANIFEST_DIR not set".to_owned())
|
||||
})?);
|
||||
|
||||
let workspace_dir = manifest_dir.parent().ok_or_else(|| {
|
||||
XtaskError::with_message("invalid CARGO_MANIFEST_DIR".to_owned())
|
||||
})?;
|
||||
|
||||
let ctx = Context {
|
||||
workspace: workspace_dir,
|
||||
};
|
||||
|
||||
match task {
|
||||
"mkimg" => mkimg::mkimg_bios_gpt(ctx),
|
||||
_ => Err(XtaskError::with_message(format!("unknown task \"{}\"", task))),
|
||||
}
|
||||
}
|
||||
|
||||
struct Context<'a> {
|
||||
workspace: &'a Path,
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct XtaskError {
|
||||
message: String,
|
||||
parent: Option<Box<dyn Error>>,
|
||||
}
|
||||
|
||||
impl XtaskError {
|
||||
fn with_message(message: String) -> Self {
|
||||
Self {
|
||||
message,
|
||||
parent: None,
|
||||
}
|
||||
}
|
||||
|
||||
fn wrap_with_message<E>(err: E, message: String) -> Self
|
||||
where
|
||||
E: Error + 'static,
|
||||
{
|
||||
Self {
|
||||
message,
|
||||
parent: Some(Box::new(err)),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for XtaskError {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "{}", self.message)?;
|
||||
if let Some(parent) = &self.parent {
|
||||
write!(f, ": {}", parent)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl Error for XtaskError {}
|
||||
@ -0,0 +1,32 @@
|
||||
use crate::{Context, XtaskError};
|
||||
|
||||
const BLOCK_SIZE: u64 = 512;
|
||||
const PARTITION_ENTRY_SIZE: u64 = 128;
|
||||
|
||||
const ATTR_REQUIRED: u64 = 1 >> 0;
|
||||
const ATTR_NO_BLOCK_IO_PROTO: u64 = 1 >> 1;
|
||||
const ATTR_LEGACY_BIOS_BOOTABLE: u64 = 1 >> 2;
|
||||
|
||||
// LBA 0: MBR
|
||||
// LBA 1: partition header
|
||||
// LBA 2..33: partition table entries
|
||||
// LBA 34..n: usable blocks
|
||||
// LBA -33..-2: partition table entries (dup)
|
||||
// LBA -1: partition header (dup)
|
||||
|
||||
struct Partition {
|
||||
type_guid: [u8; 16],
|
||||
part_guid: [u8; 16],
|
||||
lba_start: u64,
|
||||
lba_end: u64,
|
||||
attr: u64,
|
||||
name: String,
|
||||
}
|
||||
|
||||
|
||||
|
||||
pub fn mkimg_bios_gpt(ctx: Context) -> Result<(), XtaskError> {
|
||||
println!("dir={}", ctx.workspace.to_string_lossy());
|
||||
|
||||
Ok(())
|
||||
}
|
||||
Loading…
Reference in New Issue