Nightloader/i386/legacy-boot/src-asm/drivers/manager.asm

; Start with the driver data at 1 MiB, continue for 2 MiB
DRIVER_MEMORY_AREA      equ 0x100000
DRIVER_SLOT_SIZE        equ 65536
DRIVER_SLOT_COUNT       equ 32

; Functions of all drivers which get initialized (in the order of
; initialization); the last entry must be a zero, but at 32 entries,
; the end is forced by the main initialization function.
driver_init_functions:
    dd          initialize_pci_driver
    ; Ending Entry
    dd          0

; [Furthest from EBP]
;   -- No Arguments --
; [Nearest to EBP]
setup_drivers:
    push        dword                   esi
    sub         esp,                    64
    mov         esi,                    esp

    mov         [esi + (64 - 4)],       eax
    mov         [esi + (64 - 8)],       ebx
    mov         [esi + (64 - 12)],      ecx
    mov         [esi + (64 - 16)],      edx
    mov         [esi + (64 - 20)],      edi

    ; [esi + 8]:    Pointer to the current driver init function
    ; [esi + 12]L   Pointer to current driver slot
    ; ecx:          Driver slot index

    xor ecx, ecx

.driver_setup_loop:
    cmp         ecx,                    DRIVER_SLOT_COUNT
    jae         .epilog

    mov         ebx,                    ecx
    shl         ebx,                    2
    add         ebx,                    driver_init_functions
    mov         eax,                    [ebx]
    mov         [esi + 8],              eax

    cmp         eax,                    0
    je          .epilog

    mov         eax,                    ecx
    mov         edx,                    DRIVER_SLOT_SIZE
    mul         edx
    mov         [esi + 12],             eax

    push        ebp
    mov         ebp,                    esp
    push        dword [esi + 12]
    mov         eax,                    [esi + 8]
    call        eax
    mov         esp,                    ebp
    pop         ebp

    inc ecx
    jmp .driver_setup_loop

.epilog:
    mov         eax,                    [esi + (64 - 4)]
    mov         ebx,                    [esi + (64 - 8)]
    mov         ecx,                    [esi + (64 - 12)]
    mov         edx,                    [esi + (64 - 16)]
    mov         edi,                    [esi + (64 - 20)]

    add         esp,                    64
    pop         dword esi
    ret

%include "drivers/pci/driver.asm"