442 lines
14 KiB
NASM
442 lines
14 KiB
NASM
; RDC M2010/M2012 video driver.
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; Standard driver stuff
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format PE DLL native at 0
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entry start
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__DEBUG__ equ 1
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__DEBUG_LEVEL__ equ 1
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section '.flat' readable writable executable
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include '../proc32.inc'
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include '../struct.inc'
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include '../macros.inc'
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include '../fdo.inc'
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; Display-specific driver stuff
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; Kernel passes to init_cursor cursors with fixed size 32x32
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KERNEL_CURSOR_WIDTH = 32
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KERNEL_CURSOR_HEIGHT = 32
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; Constants for IOCTL codes
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SRV_GETVERSION = 0
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SRV_ENUM_MODES = 1
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SRV_SET_MODE = 2
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; Constants for SRV_GETVERSION result
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CURRENT_API = 0x0200
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COMPATIBLE_API = 0x0100
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API_VERSION = (COMPATIBLE_API shl 16) + CURRENT_API
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struct RWSEM
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wait_list LHEAD
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count dd ?
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ends
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; Some structures
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struct display_t
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x dd ?
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y dd ?
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width dd ?
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height dd ?
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bits_per_pixel dd ?
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vrefresh dd ?
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lfb dd ?
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lfb_pitch dd ?
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win_map_lock RWSEM
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win_map dd ?
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win_map_pitch dd ?
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win_map_size dd ?
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modes dd ?
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ddev dd ?
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connector dd ?
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crtc dd ?
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cr_list.next dd ?
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cr_list.prev dd ?
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cursor dd ?
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init_cursor dd ?
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select_cursor dd ?
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show_cursor dd ?
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move_cursor dd ?
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restore_cursor dd ?
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disable_mouse dd ?
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mask_seqno dd ?
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check_mouse dd ?
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check_m_pixel dd ?
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bytes_per_pixel dd ?
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ends
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struct APPOBJ ; common object header
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magic dd ? ;
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destroy dd ? ; internal destructor
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fd dd ? ; next object in list
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bk dd ? ; prev object in list
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pid dd ? ; owner id
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ends
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struct CURSOR APPOBJ
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base dd ? ;allocated memory
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hot_x dd ? ;hotspot coords
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hot_y dd ?
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list_next dd ? ;next cursor in cursor list
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list_prev dd ? ;prev cursor in cursor list
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dev_obj dd ? ;device depended data
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ends
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; Constants specific to our drivers
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; We are handling two videocards: M2010 and M2012
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PCI_VENDOR_RDC = 0x17F3
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; I like this approach to select device IDs!
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PCI_CHIP_M2010 = 0x2010
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PCI_CHIP_M2012 = 0x2012
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; I/O ports for CRT registers
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COLOR_CRTC_INDEX = 0x3D4
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COLOR_CRTC_DATA = 0x3D5
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; The value that unlocks extended CRT registers:
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; index 0x80, value 0xA8
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ENABLE_EXTENDED_REGS = 0xA880
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; Hardware cursors have size 64x64
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HW_CURSOR_WIDTH = 64
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HW_CURSOR_HEIGHT = 64
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; Multiplication to powers of two can be replaced with shifts,
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; x*HW_CURSOR_WIDTH = x shl HW_CURSOR_WIDTH_SHIFT
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HW_CURSOR_WIDTH_SHIFT = 6
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HW_CURSOR_HEIGHT_SHIFT = 6
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; MMIO registers responsible for hardware cursor, see PRM
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HWC_MMIO_CTRL = 0x580
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HWC_MMIO_OFFSET = 0x584
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HWC_MMIO_POSITION = 0x588
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HWC_MMIO_ADDRESS = 0x58C
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; Data for hardware cursors must be stored in videomemory,
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; so we need an allocator for objects inside videomemory.
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; Currently, we just reserve a fixed amount of memory for cursors
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; (cursor size is the same for all cursors) and keep a bitfield
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; that describes free blocks. 32 bits fit nicely in one dword.
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MAX_CURSORS = 32
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; === Entry points for external code ===
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; Called once when driver is loading and once at shutdown.
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; When loading, must initialize itself, register itself in the system
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; and return eax = value obtained when registering.
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; Cdecl with two parameters.
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proc start
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push ebx esi ; save used registers to be stdcall
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virtual at esp
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rd 2 ; saved registers
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dd ? ; return address
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.reason dd ? ; DRV_ENTRY or DRV_EXIT
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.cmdline dd ? ; normally NULL
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end virtual
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; 1. Check the reason for the call, do nothing unless initializing.
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cmp [.reason], DRV_ENTRY
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jnz .nothing
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; 2. Find the PCI device for our videocard.
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; If not found, just return zero.
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invoke GetPCIList
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mov ebx, eax
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.look_pcidev_loop:
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mov ebx, [ebx+PCIDEV.fd]
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cmp ebx, eax
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jz .pcidev_notfound
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cmp [ebx+PCIDEV.vendor_device_id], PCI_VENDOR_RDC + (PCI_CHIP_M2010 shl 16)
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jz .pcidev_found
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cmp [ebx+PCIDEV.vendor_device_id], PCI_VENDOR_RDC + (PCI_CHIP_M2012 shl 16)
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jnz .look_pcidev_loop
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.pcidev_found:
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; 3. Get addresses, sizes and pointers from the hardware.
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; 3a. Create mapping for MMIO.
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invoke PciRead32, dword [ebx+PCIDEV.bus], dword [ebx+PCIDEV.devfn], 14h
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and al, not 0xF
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invoke MapIoMem, eax, 10000h, PG_NOCACHE+PG_SW
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test eax, eax
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jz .nothing
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mov [mmio], eax
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; 3b. Get videomemory size. It is stored in 3 lower bits of 0xAA extended register
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; logarithmically started with 8Mb.
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mov dx, COLOR_CRTC_INDEX
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mov ax, ENABLE_EXTENDED_REGS
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out dx, ax
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mov al, 0xAA
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out dx, al
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inc edx
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in al, dx
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and eax, 7
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mov ecx, eax
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mov eax, 8 shl 20
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shl eax, cl
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mov [video_mem_size], eax
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; 3c. Reserve area for cursors in the last part of videomemory.
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sub eax, MAX_CURSORS * HW_CURSOR_WIDTH * HW_CURSOR_HEIGHT * 4
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mov [cursors_base_offset], eax
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; 3d. Create mapping for part of videomemory that we have reserved for cursors.
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; Note: we can't just use system-wide mapping at 0xFE000000, it is too short.
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invoke PciRead32, dword [ebx+PCIDEV.bus], dword [ebx+PCIDEV.devfn], 10h
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and al, not 0xF
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add eax, [cursors_base_offset]
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invoke MapIoMem, eax, MAX_CURSORS * HW_CURSOR_WIDTH * HW_CURSOR_HEIGHT * 4, PG_SW
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test eax, eax
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jz .nothing
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mov [cursors_base_va], eax
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; 4. Install cursor handlers.
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; 4a. Get pointer to the structure that keeps everything display-related.
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invoke GetDisplay
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mov ebx, eax
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; 4b. Make sure that no one tries to use partially-changed structure.
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pushf
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cli
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; 4c. Ask the previous handler to restore image hidden beyond cursor.
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stdcall [ebx+display_t.restore_cursor], 0, 0
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; 4d. Store pointers to our functions.
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mov [ebx+display_t.init_cursor], init_cursor
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mov [ebx+display_t.select_cursor], select_cursor
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mov [ebx+display_t.show_cursor], 0
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mov [ebx+display_t.move_cursor], move_cursor
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mov [ebx+display_t.restore_cursor], restore_cursor
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mov [ebx+display_t.disable_mouse], disable_mouse
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; 4e. The kernel will pass all new cursors to our init_cursor,
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; but we must process already created cursors ourselves to be able to
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; select_cursor them when requested. Do it now: pass every cursor
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; in the list display_t.cr_list to init_cursor.
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add ebx, display_t.cr_list.next
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mov esi, ebx
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.init_old_cursors_loop:
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mov esi, [esi]
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cmp esi, ebx
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jz .init_old_cursors_done
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lea eax, [esi-CURSOR.list_next]
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push eax
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call init_cursor
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pop eax
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jmp .init_old_cursors_loop
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.init_old_cursors_done:
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; 4f. Setup the current cursor.
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stdcall move_cursor, [ebx+display_t.cursor-display_t.cr_list.next], 0, 0
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stdcall select_cursor, [ebx+display_t.cursor-display_t.cr_list.next]
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; 4g. It is safe now to work with display structure; restore after 4b.
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popf
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; 5. Say something happy to the (curious) user.
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mov esi, success_msg
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invoke SysMsgBoardStr
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; 6. Register ourselves as a service.
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; Note: not really needed currently as we don't do any useful in ioctl_handler,
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; but do it nevertheless for future expansion.
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invoke RegService, rdc_name, ioctl_handler
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.nothing:
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pop esi ebx ; restore used registers to be stdcall
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ret
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.pcidev_notfound:
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xor eax, eax
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jmp .nothing
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endp
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; Service procedure for the driver - handle all IOCTL requests for the driver.
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; Stdcall with one parameter.
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proc ioctl_handler
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virtual at esp
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dd ? ; return address
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.ioctl dd ?
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end virtual
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; Not very useful currently - just return API_VERSION as a response to SRV_GETVERSION = 0.
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mov edx, [.ioctl]
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mov eax, [edx+IOCTL.io_code]
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test eax, eax
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jz .getversion
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.error:
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or eax, -1 ; fail everything unknown
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retn 4
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.getversion:
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cmp [edx+IOCTL.out_size], 4
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jnz .error
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mov eax, [edx+IOCTL.output]
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mov dword [eax], API_VERSION
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xor eax, eax
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retn 4
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endp
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; === Cursors ===
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; This function is called when an application registers a new cursor.
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; Cdecl with one parameter, return value ignored.
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proc init_cursor
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push esi edi
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virtual at esp
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rd 2 ; saved registers
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dd ? ; return address
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.cursor dd ?
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end virtual
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; We store one specific dword in CURSOR.dev_obj,
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; index in cursors area from 0 to NUM_CURSORS-1, or -1 for error.
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; 1. Prepare: store -1 to CURSOR.dev_obj and pointer to destroy function.
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mov edx, [.cursor]
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mov [edx+CURSOR.dev_obj], -1
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mov [edx+CURSOR.destroy], destroy_cursor
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; 2. Allocate videomemory.
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bsr edi, [free_cursors]
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jz .nocopy
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btr [free_cursors], edi
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; 3. Store the allocated item to CURSOR.dev_obj.
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mov [edx+CURSOR.dev_obj], edi
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; 4. Copy data from kernel-provided cursor to videomemory,
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; transforming KERNEL_CURSOR_WIDTH*KERNEL_CURSOR_HEIGHT*(4 bytes RGBA) to
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; HW_CURSOR_WIDTH*HW_CURSOR_HEIGHT*(4 bytes RGBA).
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shl edi, HW_CURSOR_WIDTH_SHIFT + HW_CURSOR_HEIGHT_SHIFT + 2
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add edi, [cursors_base_va]
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mov esi, [edx+CURSOR.base]
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push KERNEL_CURSOR_HEIGHT
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xor eax, eax
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@@:
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mov ecx, KERNEL_CURSOR_WIDTH
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rep movsd
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mov ecx, HW_CURSOR_WIDTH - KERNEL_CURSOR_WIDTH
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rep stosd
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dec dword [esp]
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jnz @b
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pop ecx
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mov ecx, HW_CURSOR_WIDTH * (HW_CURSOR_HEIGHT - KERNEL_CURSOR_HEIGHT)
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rep stosd
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.nocopy:
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; 5. We don't need kernel-provided data anymore; free it now.
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invoke KernelFree, [edx+CURSOR.base]
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pop edi esi
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ret
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endp
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; This function is called when a thread that has created a cursor
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; is terminating and we need to free the cursor.
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proc destroy_cursor
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; 1. Free allocated videomemory.
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mov edx, [eax+CURSOR.dev_obj]
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test edx, edx
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js .nofree
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bts [free_cursors], edx
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.nofree:
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; 2. Remove the cursor from the overall list at display_t.cr_list.
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pushf
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cli
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mov ecx, [eax+CURSOR.list_next]
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mov edx, [eax+CURSOR.list_prev]
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mov [ecx+4], edx
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mov [edx], ecx
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popf
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; 3. Free memory allocated for kernel object.
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jmp [DestroyObject]
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endp
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; This function is called when cursor shape needs to be changed,
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; either due to explicit request from application
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; or due to moving from one window to another.
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; Stdcall with one parameter, return value ignored.
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proc select_cursor
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virtual at esp
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dd ? ; return address
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.cursor dd ?
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end virtual
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mov eax, [.cursor]
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mov eax, [eax+CURSOR.dev_obj]
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cmp eax, -1
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jz .nothing
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; Setup base address of cursor, relative to videomemory,
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; and enable hardware cursor.
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; See PRM for details.
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shl eax, HW_CURSOR_WIDTH_SHIFT + HW_CURSOR_HEIGHT_SHIFT + 2
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add eax, [cursors_base_offset]
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shr eax, 3
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mov edx, [mmio]
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mov [edx+HWC_MMIO_ADDRESS], eax
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mov dword [edx+HWC_MMIO_CTRL], (1 shl 31) + (1 shl 1) + (1 shl 0)
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.nothing:
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ret 4
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endp
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; This function is called when cursor is moved to a new place.
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; Stdcall with three parameters, return value ignored.
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proc move_cursor
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virtual at esp
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dd ? ; return address
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.cursor dd ?
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.x dd ?
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.y dd ?
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.xoffset dd ?
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.yoffset dd ?
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end virtual
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; If cursor x is smaller than hotspot x,
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; only part of cursor is shown at position x=0
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; with x offset = (hotspot x) - (cursor x).
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; Otherwise, the entire cursor is shown (x offset = 0)
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; at position x = (cursor x) - (hotspot x).
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; Similar for y. Refer to PRM for details.
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xor ecx, ecx
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mov edx, [.cursor]
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mov eax, [.x]
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sub eax, [edx+CURSOR.hot_x]
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jae @f
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sub ecx, eax
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xor eax, eax
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@@:
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mov [.x], eax
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mov eax, [.y]
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sub eax, [edx+CURSOR.hot_y]
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jae @f
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shl eax, 8
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sub ecx, eax
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xor eax, eax
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@@:
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mov [.y], eax
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mov edx, [mmio]
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mov eax, [.y]
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add eax, HW_CURSOR_HEIGHT - 1 ; no scaling
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shl eax, 16
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add eax, ecx
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mov [edx+HWC_MMIO_OFFSET], eax
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mov eax, [.y]
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shl eax, 16
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add eax, [.x]
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mov [edx+HWC_MMIO_POSITION], eax
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mov eax, [edx+HWC_MMIO_CTRL]
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mov [edx+HWC_MMIO_CTRL], eax
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ret 12
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endp
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; Stdcall with two parameters, return value ignored.
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proc restore_cursor
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; No-operation for hardware cursors.
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ret 8
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endp
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; No parameters, return value ignored.
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proc disable_mouse
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; No-operation for hardware cursors.
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ret
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endp
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; === Data ===
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rdc_name db 'DISPLAY',0
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success_msg db 'RDC: using hardware cursors',13,10,0
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align 4
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; Look at the comment before definition of NUM_CURSORS.
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free_cursors dd 0xFFFFFFFF
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data fixups
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end data
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include '../peimport.inc'
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;include_debug_strings
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IncludeIGlobals
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IncludeUGlobals
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align 4
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mmio dd ? ; virtual address of MMIO for our device
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video_mem_size dd ? ; total size of video memory, in bytes
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cursors_base_offset dd ? ; base of cursor data, relative to video memory start
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cursors_base_va dd ? ; mapped virtual address of cursor data
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