Benji Dial
63167f223e
currently, BAR fields of IDE drives are all returning zero, and the ATA read function isn't working. i'm not sure why. i'm going to work on VESA next, and come back to the IDE driver later
109 lines
No EOL
1.3 KiB
NASM
109 lines
No EOL
1.3 KiB
NASM
bits 16
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org 0x7c3e
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kernel_sectors equ 64
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kernel_segment equ 0x3000
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support_flags equ 0x4000
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pci_hw_char equ 0x4001
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pci_ver equ 0x4002
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pci_support equ 0x80
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vesa_segment equ 0x0420
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in al, 0x92
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or al, 0x02
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out 0x92, al
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xor ax, ax
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mov ss, ax
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mov sp, 0x7ffc
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mov ah, 0x01
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mov ch, 0x3f
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int 0x10
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mov ax, kernel_segment
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mov es, ax
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mov ax, 0x0200 + kernel_sectors
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xor bx, bx
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mov cx, 0x0002
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xor dh, dh
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int 0x13
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mov ax, 0xb101
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int 0x1a
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cmp edx, 0x20494350
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jne no_pci
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test ah, ah
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jnz no_pci
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mov byte [support_flags], pci_support
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mov byte [pci_hw_char], al
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mov word [pci_ver], bx
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no_pci:
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mov dword [vesa_segment * 16], 'V' + 'B' * 256 + 'E' * 65535 + '2' * 16777216
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mov ax, vesa_segment
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mov es, ax
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xor di, di
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mov ax, 0x4f00
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int 0x10
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cmp ax, 0x004f
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jne no_vbe
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cli
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lgdt [gdt]
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mov eax, cr0
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or al, 0x01
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mov cr0, eax
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jmp 0x08:pmode
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no_vbe:
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;TODO
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cli
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real_halt:
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hlt
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jmp real_halt
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bits 32
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pmode:
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mov ax, 0x10
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mov ds, ax
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mov ss, ax
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mov esp, 0x00040000
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xor ebp, ebp
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call kernel_segment * 16
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halt:
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hlt
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jmp halt
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times $$ + 0x018a - $ db 0
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;0x7dc8
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gdt:
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dw .e - .t
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dd .t
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.t:
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dq 0x0000_0000_0000_0000
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dq 0x00c0_9a00_0000_0037
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dq 0x00c1_9200_0000_ffff
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dq 0x0000_0000_0000_0000;TODO: task
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dq 0x0000_0000_0000_0000
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dq 0x0000_0000_0000_0000
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.e:
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dw 0xaa55 |