OSDev.org

Code: Select all

[00000039] ahci: detecting AHCI controller...
[0000003E] ahci: found AHCI controller on PCI slot 00:0D:00
[0000003E] PCI device 00:0D:00 MMIO at 0xF0806000, mapped at 0xE0013000 -> 0xE0014FFF
[0000003F] ahci: found SATA device 'VBOX HARDDISK' on AHCI port 10
[00000045] Registered AHCI device, device number 0

Code: Select all

	; clear all nescessary structures
	mov edi, ahci_command_list
	mov ecx, end_ahci_command_list - ahci_command_list
	xor al, al
	rep stosb

	mov edi, ahci_command_table
	mov ecx, end_ahci_command_table - ahci_command_table
	xor al, al
	rep stosb

	; make the command list
	mov [ahci_command_list.cfis_length], (end_ahci_command_fis-ahci_command_fis+3) / 4
	mov [ahci_command_list.prdt_length], 1
	mov dword[ahci_command_list.command_table], ahci_command_table

	; the command FIS
	mov [ahci_command_fis.fis_type], AHCI_FIS_H2D
	mov [ahci_command_fis.flags], 0x80
	mov [ahci_command_fis.command], SATA_READ_LBA28
	mov [ahci_command_fis.device], 0xE0
	mov eax, [.count]
	mov [ahci_command_fis.count], ax

	; LBA...
	mov eax, dword[.lba]
	mov [ahci_command_fis.lba0], al
	shr eax, 8
	mov [ahci_command_fis.lba1], al
	shr eax, 8
	mov [ahci_command_fis.lba2], al
	shr eax, 8
	mov [ahci_command_fis.lba3], al

	; the PRDT
	mov eax, [.buffer_phys]
	mov dword[ahci_prdt.base], eax
	mov eax, [.count]
	shl eax, 9	; mul 512
	mov [ahci_prdt.count], eax

	; send the command to the device
	movzx edi, [.port]
	shl edi, 7
	add edi, AHCI_ABAR_PORT_CONTROL
	add edi, [ahci_abar]

	mov eax, [edi+AHCI_PORT_IRQ_STATUS]
	mov [edi+AHCI_PORT_IRQ_STATUS], eax

	and dword[edi+AHCI_PORT_COMMAND], not 1
	and dword[edi+AHCI_PORT_COMMAND_ISSUE], not 1
	mov dword[edi+AHCI_PORT_COMMAND_LIST], ahci_command_list
	mov dword[edi+AHCI_PORT_COMMAND_LIST+4], 0
	or dword[edi+AHCI_PORT_COMMAND], 1
	or dword[edi+AHCI_PORT_COMMAND_ISSUE], 1

.loop:
	test dword[edi+AHCI_PORT_COMMAND_ISSUE], 1	; never leaves this loop!!
	jnz .loop

.after_loop:
	; turn off the command execution
	and dword[edi+AHCI_PORT_COMMAND], not 1
	and dword[edi+AHCI_PORT_COMMAND_ISSUE], not 1

Code: Select all

; the PRDT
   mov eax, [.buffer_phys]
   mov dword[ahci_prdt.base], eax
   mov eax, [.count]
   shl eax, 9   ; mul 512
   mov [ahci_prdt.count], eax

Code: Select all

.loop:
   test dword[edi+AHCI_PORT_COMMAND_ISSUE], 1   ; never leaves this loop!!
   jnz .loop

Code: Select all

.loop:
    mov eax, [edi+AHCI_PORT_COMMAND_ISSUE]
    test eax, eax
    jnz .loop