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/**********************************************************

 * Copyright 1998-2009 VMware, Inc.  All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person

 * obtaining a copy of this software and associated documentation

 * files (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use, copy,

 * modify, merge, publish, distribute, sublicense, and/or sell copies

 * of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 *

 **********************************************************/

/*

 * svga_reg.h --

 *

 *    Virtual hardware definitions for the VMware SVGA II device.

 */

#ifndef _SVGA_REG_H_

#define _SVGA_REG_H_

/*

 * PCI device IDs.

 */

#define PCI_VENDOR_ID_VMWARE            0x15AD

#define PCI_DEVICE_ID_VMWARE_SVGA2      0x0405

/*

 * SVGA_REG_ENABLE bit definitions.

 */

#define SVGA_REG_ENABLE_DISABLE     0

#define SVGA_REG_ENABLE_ENABLE      1

#define SVGA_REG_ENABLE_HIDE        2

#define SVGA_REG_ENABLE_ENABLE_HIDE (SVGA_REG_ENABLE_ENABLE |\

				     SVGA_REG_ENABLE_HIDE)

/*

 * Legal values for the SVGA_REG_CURSOR_ON register in old-fashioned

 * cursor bypass mode. This is still supported, but no new guest

 * drivers should use it.

 */

#define SVGA_CURSOR_ON_HIDE            0x0   /* Must be 0 to maintain backward compatibility */

#define SVGA_CURSOR_ON_SHOW            0x1   /* Must be 1 to maintain backward compatibility */

#define SVGA_CURSOR_ON_REMOVE_FROM_FB  0x2   /* Remove the cursor from the framebuffer because we need to see what's under it */

#define SVGA_CURSOR_ON_RESTORE_TO_FB   0x3   /* Put the cursor back in the framebuffer so the user can see it */

/*

 * The maximum framebuffer size that can traced for e.g. guests in VESA mode.

 * The changeMap in the monitor is proportional to this number. Therefore, we'd

 * like to keep it as small as possible to reduce monitor overhead (using

 * SVGA_VRAM_MAX_SIZE for this increases the size of the shared area by over

 * 4k!).

 *

 * NB: For compatibility reasons, this value must be greater than 0xff0000.

 *     See bug 335072.

 */

#define SVGA_FB_MAX_TRACEABLE_SIZE      0x1000000

#define SVGA_MAX_PSEUDOCOLOR_DEPTH      8

#define SVGA_MAX_PSEUDOCOLORS           (1 << SVGA_MAX_PSEUDOCOLOR_DEPTH)

#define SVGA_NUM_PALETTE_REGS           (3 * SVGA_MAX_PSEUDOCOLORS)

#define SVGA_MAGIC         0x900000UL

#define SVGA_MAKE_ID(ver)  (SVGA_MAGIC << 8 | (ver))

/* Version 2 let the address of the frame buffer be unsigned on Win32 */

#define SVGA_VERSION_2     2

#define SVGA_ID_2          SVGA_MAKE_ID(SVGA_VERSION_2)

/* Version 1 has new registers starting with SVGA_REG_CAPABILITIES so

   PALETTE_BASE has moved */

#define SVGA_VERSION_1     1

#define SVGA_ID_1          SVGA_MAKE_ID(SVGA_VERSION_1)

/* Version 0 is the initial version */

#define SVGA_VERSION_0     0

#define SVGA_ID_0          SVGA_MAKE_ID(SVGA_VERSION_0)

/* "Invalid" value for all SVGA IDs. (Version ID, screen object ID, surface ID...) */

#define SVGA_ID_INVALID    0xFFFFFFFF

/* Port offsets, relative to BAR0 */

#define SVGA_INDEX_PORT         0x0

#define SVGA_VALUE_PORT         0x1

#define SVGA_BIOS_PORT          0x2

#define SVGA_IRQSTATUS_PORT     0x8

/*

 * Interrupt source flags for IRQSTATUS_PORT and IRQMASK.

 *

 * Interrupts are only supported when the

 * SVGA_CAP_IRQMASK capability is present.

 */

#define SVGA_IRQFLAG_ANY_FENCE            0x1    /* Any fence was passed */

#define SVGA_IRQFLAG_FIFO_PROGRESS        0x2    /* Made forward progress in the FIFO */

#define SVGA_IRQFLAG_FENCE_GOAL           0x4    /* SVGA_FIFO_FENCE_GOAL reached */

/*

 * Registers

 */

enum {

   SVGA_REG_ID = 0,

   SVGA_REG_ENABLE = 1,

   SVGA_REG_WIDTH = 2,

   SVGA_REG_HEIGHT = 3,

   SVGA_REG_MAX_WIDTH = 4,

   SVGA_REG_MAX_HEIGHT = 5,

   SVGA_REG_DEPTH = 6,

   SVGA_REG_BITS_PER_PIXEL = 7,       /* Current bpp in the guest */

   SVGA_REG_PSEUDOCOLOR = 8,

   SVGA_REG_RED_MASK = 9,

   SVGA_REG_GREEN_MASK = 10,

   SVGA_REG_BLUE_MASK = 11,

   SVGA_REG_BYTES_PER_LINE = 12,

   SVGA_REG_FB_START = 13,            /* (Deprecated) */

   SVGA_REG_FB_OFFSET = 14,

   SVGA_REG_VRAM_SIZE = 15,

   SVGA_REG_FB_SIZE = 16,

   /* ID 0 implementation only had the above registers, then the palette */

   SVGA_REG_CAPABILITIES = 17,

   SVGA_REG_MEM_START = 18,           /* (Deprecated) */

   SVGA_REG_MEM_SIZE = 19,

   SVGA_REG_CONFIG_DONE = 20,         /* Set when memory area configured */

   SVGA_REG_SYNC = 21,                /* See "FIFO Synchronization Registers" */

   SVGA_REG_BUSY = 22,                /* See "FIFO Synchronization Registers" */

   SVGA_REG_GUEST_ID = 23,            /* Set guest OS identifier */

   SVGA_REG_CURSOR_ID = 24,           /* (Deprecated) */

   SVGA_REG_CURSOR_X = 25,            /* (Deprecated) */

   SVGA_REG_CURSOR_Y = 26,            /* (Deprecated) */

   SVGA_REG_CURSOR_ON = 27,           /* (Deprecated) */

   SVGA_REG_HOST_BITS_PER_PIXEL = 28, /* (Deprecated) */

   SVGA_REG_SCRATCH_SIZE = 29,        /* Number of scratch registers */

   SVGA_REG_MEM_REGS = 30,            /* Number of FIFO registers */

   SVGA_REG_NUM_DISPLAYS = 31,        /* (Deprecated) */

   SVGA_REG_PITCHLOCK = 32,           /* Fixed pitch for all modes */

   SVGA_REG_IRQMASK = 33,             /* Interrupt mask */

   /* Legacy multi-monitor support */

   SVGA_REG_NUM_GUEST_DISPLAYS = 34,/* Number of guest displays in X/Y direction */

   SVGA_REG_DISPLAY_ID = 35,        /* Display ID for the following display attributes */

   SVGA_REG_DISPLAY_IS_PRIMARY = 36,/* Whether this is a primary display */

   SVGA_REG_DISPLAY_POSITION_X = 37,/* The display position x */

   SVGA_REG_DISPLAY_POSITION_Y = 38,/* The display position y */

   SVGA_REG_DISPLAY_WIDTH = 39,     /* The display's width */

   SVGA_REG_DISPLAY_HEIGHT = 40,    /* The display's height */

   /* See "Guest memory regions" below. */

   SVGA_REG_GMR_ID = 41,

   SVGA_REG_GMR_DESCRIPTOR = 42,

   SVGA_REG_GMR_MAX_IDS = 43,

   SVGA_REG_GMR_MAX_DESCRIPTOR_LENGTH = 44,

   SVGA_REG_TRACES = 45,            /* Enable trace-based updates even when FIFO is on */

   SVGA_REG_GMRS_MAX_PAGES = 46,    /* Maximum number of 4KB pages for all GMRs */

   SVGA_REG_MEMORY_SIZE = 47,       /* Total dedicated device memory excluding FIFO */

   SVGA_REG_COMMAND_LOW = 48,       /* Lower 32 bits and submits commands */

   SVGA_REG_COMMAND_HIGH = 49,      /* Upper 32 bits of command buffer PA */

   SVGA_REG_MAX_PRIMARY_BOUNDING_BOX_MEM = 50,   /* Max primary memory */

   SVGA_REG_SUGGESTED_GBOBJECT_MEM_SIZE_KB = 51, /* Suggested limit on mob mem */

   SVGA_REG_DEV_CAP = 52,           /* Write dev cap index, read value */

   SVGA_REG_CMD_PREPEND_LOW = 53,

   SVGA_REG_CMD_PREPEND_HIGH = 54,

   SVGA_REG_SCREENTARGET_MAX_WIDTH = 55,

   SVGA_REG_SCREENTARGET_MAX_HEIGHT = 56,

   SVGA_REG_MOB_MAX_SIZE = 57,

   SVGA_REG_TOP = 58,               /* Must be 1 more than the last register */

   SVGA_PALETTE_BASE = 1024,        /* Base of SVGA color map */

   /* Next 768 (== 256*3) registers exist for colormap */

   SVGA_SCRATCH_BASE = SVGA_PALETTE_BASE + SVGA_NUM_PALETTE_REGS

                                    /* Base of scratch registers */

   /* Next reg[SVGA_REG_SCRATCH_SIZE] registers exist for scratch usage:

      First 4 are reserved for VESA BIOS Extension; any remaining are for

      the use of the current SVGA driver. */

};

/*

 * Guest memory regions (GMRs):

 *

 * This is a new memory mapping feature available in SVGA devices

 * which have the SVGA_CAP_GMR bit set. Previously, there were two

 * fixed memory regions available with which to share data between the

 * device and the driver: the FIFO ('MEM') and the framebuffer. GMRs

 * are our name for an extensible way of providing arbitrary DMA

 * buffers for use between the driver and the SVGA device. They are a

 * new alternative to framebuffer memory, usable for both 2D and 3D

 * graphics operations.

 *

 * Since GMR mapping must be done synchronously with guest CPU

 * execution, we use a new pair of SVGA registers:

 *

 *   SVGA_REG_GMR_ID --

 *

 *     Read/write.

 *     This register holds the 32-bit ID (a small positive integer)

 *     of a GMR to create, delete, or redefine. Writing this register

 *     has no side-effects.

 *

 *   SVGA_REG_GMR_DESCRIPTOR --

 *

 *     Write-only.

 *     Writing this register will create, delete, or redefine the GMR

 *     specified by the above ID register. If this register is zero,

 *     the GMR is deleted. Any pointers into this GMR (including those

 *     currently being processed by FIFO commands) will be

 *     synchronously invalidated.

 *

 *     If this register is nonzero, it must be the physical page

 *     number (PPN) of a data structure which describes the physical

 *     layout of the memory region this GMR should describe. The

 *     descriptor structure will be read synchronously by the SVGA

 *     device when this register is written. The descriptor need not

 *     remain allocated for the lifetime of the GMR.

 *

 *     The guest driver should write SVGA_REG_GMR_ID first, then

 *     SVGA_REG_GMR_DESCRIPTOR.

 *

 *   SVGA_REG_GMR_MAX_IDS --

 *

 *     Read-only.

 *     The SVGA device may choose to support a maximum number of

 *     user-defined GMR IDs. This register holds the number of supported

 *     IDs. (The maximum supported ID plus 1)

 *

 *   SVGA_REG_GMR_MAX_DESCRIPTOR_LENGTH --

 *

 *     Read-only.

 *     The SVGA device may choose to put a limit on the total number

 *     of SVGAGuestMemDescriptor structures it will read when defining

 *     a single GMR.

 *

 * The descriptor structure is an array of SVGAGuestMemDescriptor

 * structures. Each structure may do one of three things:

 *

 *   - Terminate the GMR descriptor list.

 *     (ppn==0, numPages==0)

 *

 *   - Add a PPN or range of PPNs to the GMR's virtual address space.

 *     (ppn != 0, numPages != 0)

 *

 *   - Provide the PPN of the next SVGAGuestMemDescriptor, in order to

 *     support multi-page GMR descriptor tables without forcing the

 *     driver to allocate physically contiguous memory.

 *     (ppn != 0, numPages == 0)

 *

 * Note that each physical page of SVGAGuestMemDescriptor structures

 * can describe at least 2MB of guest memory. If the driver needs to

 * use more than one page of descriptor structures, it must use one of

 * its SVGAGuestMemDescriptors to point to an additional page.  The

 * device will never automatically cross a page boundary.

 *

 * Once the driver has described a GMR, it is immediately available

 * for use via any FIFO command that uses an SVGAGuestPtr structure.

 * These pointers include a GMR identifier plus an offset into that

 * GMR.

 *

 * The driver must check the SVGA_CAP_GMR bit before using the GMR

 * registers.

 */

/*

 * Special GMR IDs, allowing SVGAGuestPtrs to point to framebuffer

 * memory as well.  In the future, these IDs could even be used to

 * allow legacy memory regions to be redefined by the guest as GMRs.

 *

 * Using the guest framebuffer (GFB) at BAR1 for general purpose DMA

 * is being phased out. Please try to use user-defined GMRs whenever

 * possible.

 */

#define SVGA_GMR_NULL         ((uint32) -1)

#define SVGA_GMR_FRAMEBUFFER  ((uint32) -2)  /* Guest Framebuffer (GFB) */

typedef

struct SVGAGuestMemDescriptor {

   uint32 ppn;

   uint32 numPages;

} SVGAGuestMemDescriptor;

typedef

struct SVGAGuestPtr {

   uint32 gmrId;

   uint32 offset;

} SVGAGuestPtr;

/*

 * SVGAGMRImageFormat --

 *

 *    This is a packed representation of the source 2D image format

 *    for a GMR-to-screen blit. Currently it is defined as an encoding

 *    of the screen's color depth and bits-per-pixel, however, 16 bits

 *    are reserved for future use to identify other encodings (such as

 *    RGBA or higher-precision images).

 *

 *    Currently supported formats:

 *

 *       bpp depth  Format Name

 *       --- -----  -----------

 *        32    24  32-bit BGRX

 *        24    24  24-bit BGR

 *        16    16  RGB 5-6-5

 *        16    15  RGB 5-5-5

 *

 */

typedef

struct SVGAGMRImageFormat {

   union {

      struct {

         uint32 bitsPerPixel : 8;

         uint32 colorDepth   : 8;

         uint32 reserved     : 16;  /* Must be zero */

      };

      uint32 value;

   };

} SVGAGMRImageFormat;

typedef

struct SVGAGuestImage {

   SVGAGuestPtr         ptr;

   /*

    * A note on interpretation of pitch: This value of pitch is the

    * number of bytes between vertically adjacent image

    * blocks. Normally this is the number of bytes between the first

    * pixel of two adjacent scanlines. With compressed textures,

    * however, this may represent the number of bytes between

    * compression blocks rather than between rows of pixels.

    *

    * XXX: Compressed textures currently must be tightly packed in guest memory.

    *

    * If the image is 1-dimensional, pitch is ignored.

    *

    * If 'pitch' is zero, the SVGA3D device calculates a pitch value

    * assuming each row of blocks is tightly packed.

    */

   uint32 pitch;

} SVGAGuestImage;

/*

 * SVGAColorBGRX --

 *

 *    A 24-bit color format (BGRX), which does not depend on the

 *    format of the legacy guest framebuffer (GFB) or the current

 *    GMRFB state.

 */

typedef

struct SVGAColorBGRX {

   union {

      struct {

         uint32 b : 8;

         uint32 g : 8;

         uint32 r : 8;

         uint32 x : 8;  /* Unused */

      };

      uint32 value;

   };

} SVGAColorBGRX;

/*

 * SVGASignedRect --

 * SVGASignedPoint --

 *

 *    Signed rectangle and point primitives. These are used by the new

 *    2D primitives for drawing to Screen Objects, which can occupy a

 *    signed virtual coordinate space.

 *

 *    SVGASignedRect specifies a half-open interval: the (left, top)

 *    pixel is part of the rectangle, but the (right, bottom) pixel is

 *    not.

 */

typedef

struct SVGASignedRect {

   int32  left;

   int32  top;

   int32  right;

   int32  bottom;

} SVGASignedRect;

typedef

struct SVGASignedPoint {

   int32  x;

   int32  y;

} SVGASignedPoint;

/*

 *  Capabilities

 *

 *  Note the holes in the bitfield. Missing bits have been deprecated,

 *  and must not be reused. Those capabilities will never be reported

 *  by new versions of the SVGA device.

 *

 * SVGA_CAP_GMR2 --

 *    Provides asynchronous commands to define and remap guest memory

 *    regions.  Adds device registers SVGA_REG_GMRS_MAX_PAGES and

 *    SVGA_REG_MEMORY_SIZE.

 *

 * SVGA_CAP_SCREEN_OBJECT_2 --

 *    Allow screen object support, and require backing stores from the

 *    guest for each screen object.

 */

#define SVGA_CAP_NONE               0x00000000

#define SVGA_CAP_RECT_COPY          0x00000002

#define SVGA_CAP_CURSOR             0x00000020

#define SVGA_CAP_CURSOR_BYPASS      0x00000040   /* Legacy (Use Cursor Bypass 3 instead) */

#define SVGA_CAP_CURSOR_BYPASS_2    0x00000080   /* Legacy (Use Cursor Bypass 3 instead) */

#define SVGA_CAP_8BIT_EMULATION     0x00000100

#define SVGA_CAP_ALPHA_CURSOR       0x00000200

#define SVGA_CAP_3D                 0x00004000

#define SVGA_CAP_EXTENDED_FIFO      0x00008000

#define SVGA_CAP_MULTIMON           0x00010000   /* Legacy multi-monitor support */

#define SVGA_CAP_PITCHLOCK          0x00020000

#define SVGA_CAP_IRQMASK            0x00040000

#define SVGA_CAP_DISPLAY_TOPOLOGY   0x00080000   /* Legacy multi-monitor support */

#define SVGA_CAP_GMR                0x00100000

#define SVGA_CAP_TRACES             0x00200000

#define SVGA_CAP_GMR2               0x00400000

#define SVGA_CAP_SCREEN_OBJECT_2    0x00800000

#define SVGA_CAP_COMMAND_BUFFERS    0x01000000

#define SVGA_CAP_DEAD1              0x02000000

#define SVGA_CAP_CMD_BUFFERS_2      0x04000000

#define SVGA_CAP_GBOBJECTS          0x08000000

/*

 * FIFO register indices.

 *

 * The FIFO is a chunk of device memory mapped into guest physmem.  It

 * is always treated as 32-bit words.

 *

 * The guest driver gets to decide how to partition it between

 * - FIFO registers (there are always at least 4, specifying where the

 *   following data area is and how much data it contains; there may be

 *   more registers following these, depending on the FIFO protocol

 *   version in use)

 * - FIFO data, written by the guest and slurped out by the VMX.

 * These indices are 32-bit word offsets into the FIFO.

 */

enum {

   /*

    * Block 1 (basic registers): The originally defined FIFO registers.

    * These exist and are valid for all versions of the FIFO protocol.

    */

   SVGA_FIFO_MIN = 0,

   SVGA_FIFO_MAX,       /* The distance from MIN to MAX must be at least 10K */

   SVGA_FIFO_NEXT_CMD,

   SVGA_FIFO_STOP,

   /*

    * Block 2 (extended registers): Mandatory registers for the extended

    * FIFO.  These exist if the SVGA caps register includes

    * SVGA_CAP_EXTENDED_FIFO; some of them are valid only if their

    * associated capability bit is enabled.

    *

    * Note that when originally defined, SVGA_CAP_EXTENDED_FIFO implied

    * support only for (FIFO registers) CAPABILITIES, FLAGS, and FENCE.

    * This means that the guest has to test individually (in most cases

    * using FIFO caps) for the presence of registers after this; the VMX

    * can define "extended FIFO" to mean whatever it wants, and currently

    * won't enable it unless there's room for that set and much more.

    */

   SVGA_FIFO_CAPABILITIES = 4,

   SVGA_FIFO_FLAGS,

   /* Valid with SVGA_FIFO_CAP_FENCE: */

   SVGA_FIFO_FENCE,

   /*

    * Block 3a (optional extended registers): Additional registers for the

    * extended FIFO, whose presence isn't actually implied by

    * SVGA_CAP_EXTENDED_FIFO; these exist if SVGA_FIFO_MIN is high enough to

    * leave room for them.

    *

    * These in block 3a, the VMX currently considers mandatory for the

    * extended FIFO.

    */

   /* Valid if exists (i.e. if extended FIFO enabled): */

   SVGA_FIFO_3D_HWVERSION,       /* See SVGA3dHardwareVersion in svga3d_reg.h */

   /* Valid with SVGA_FIFO_CAP_PITCHLOCK: */

   SVGA_FIFO_PITCHLOCK,

   /* Valid with SVGA_FIFO_CAP_CURSOR_BYPASS_3: */

   SVGA_FIFO_CURSOR_ON,          /* Cursor bypass 3 show/hide register */

   SVGA_FIFO_CURSOR_X,           /* Cursor bypass 3 x register */

   SVGA_FIFO_CURSOR_Y,           /* Cursor bypass 3 y register */

   SVGA_FIFO_CURSOR_COUNT,       /* Incremented when any of the other 3 change */

   SVGA_FIFO_CURSOR_LAST_UPDATED,/* Last time the host updated the cursor */

   /* Valid with SVGA_FIFO_CAP_RESERVE: */

   SVGA_FIFO_RESERVED,           /* Bytes past NEXT_CMD with real contents */

   /*

    * Valid with SVGA_FIFO_CAP_SCREEN_OBJECT or SVGA_FIFO_CAP_SCREEN_OBJECT_2:

    *

    * By default this is SVGA_ID_INVALID, to indicate that the cursor

    * coordinates are specified relative to the virtual root. If this

    * is set to a specific screen ID, cursor position is reinterpreted

    * as a signed offset relative to that screen's origin.

    */

   SVGA_FIFO_CURSOR_SCREEN_ID,

   /*

    * Valid with SVGA_FIFO_CAP_DEAD

    *

    * An arbitrary value written by the host, drivers should not use it.

    */

   SVGA_FIFO_DEAD,

   /*

    * Valid with SVGA_FIFO_CAP_3D_HWVERSION_REVISED:

    *

    * Contains 3D HWVERSION (see SVGA3dHardwareVersion in svga3d_reg.h)

    * on platforms that can enforce graphics resource limits.

    */

   SVGA_FIFO_3D_HWVERSION_REVISED,

   /*

    * XXX: The gap here, up until SVGA_FIFO_3D_CAPS, can be used for new

    * registers, but this must be done carefully and with judicious use of

    * capability bits, since comparisons based on SVGA_FIFO_MIN aren't

    * enough to tell you whether the register exists: we've shipped drivers

    * and products that used SVGA_FIFO_3D_CAPS but didn't know about some of

    * the earlier ones.  The actual order of introduction was:

    * - PITCHLOCK

    * - 3D_CAPS

    * - CURSOR_* (cursor bypass 3)

    * - RESERVED

    * So, code that wants to know whether it can use any of the

    * aforementioned registers, or anything else added after PITCHLOCK and

    * before 3D_CAPS, needs to reason about something other than

    * SVGA_FIFO_MIN.

    */

   /*

    * 3D caps block space; valid with 3D hardware version >=

    * SVGA3D_HWVERSION_WS6_B1.

    */

   SVGA_FIFO_3D_CAPS      = 32,

   SVGA_FIFO_3D_CAPS_LAST = 32 + 255,

   /*

    * End of VMX's current definition of "extended-FIFO registers".

    * Registers before here are always enabled/disabled as a block; either

    * the extended FIFO is enabled and includes all preceding registers, or

    * it's disabled entirely.

    *

    * Block 3b (truly optional extended registers): Additional registers for

    * the extended FIFO, which the VMX already knows how to enable and

    * disable with correct granularity.

    *

    * Registers after here exist if and only if the guest SVGA driver

    * sets SVGA_FIFO_MIN high enough to leave room for them.

    */

   /* Valid if register exists: */

   SVGA_FIFO_GUEST_3D_HWVERSION, /* Guest driver's 3D version */

   SVGA_FIFO_FENCE_GOAL,         /* Matching target for SVGA_IRQFLAG_FENCE_GOAL */

   SVGA_FIFO_BUSY,               /* See "FIFO Synchronization Registers" */

   /*

    * Always keep this last.  This defines the maximum number of

    * registers we know about.  At power-on, this value is placed in

    * the SVGA_REG_MEM_REGS register, and we expect the guest driver

    * to allocate this much space in FIFO memory for registers.

    */

    SVGA_FIFO_NUM_REGS

};

/*

 * Definition of registers included in extended FIFO support.

 *

 * The guest SVGA driver gets to allocate the FIFO between registers

 * and data.  It must always allocate at least 4 registers, but old

 * drivers stopped there.

 *

 * The VMX will enable extended FIFO support if and only if the guest

 * left enough room for all registers defined as part of the mandatory

 * set for the extended FIFO.

 *

 * Note that the guest drivers typically allocate the FIFO only at

 * initialization time, not at mode switches, so it's likely that the

 * number of FIFO registers won't change without a reboot.

 *

 * All registers less than this value are guaranteed to be present if

 * svgaUser->fifo.extended is set. Any later registers must be tested

 * individually for compatibility at each use (in the VMX).

 *

 * This value is used only by the VMX, so it can change without

 * affecting driver compatibility; keep it that way?

 */

#define SVGA_FIFO_EXTENDED_MANDATORY_REGS  (SVGA_FIFO_3D_CAPS_LAST + 1)

/*

 * FIFO Synchronization Registers

 *

 *  This explains the relationship between the various FIFO

 *  sync-related registers in IOSpace and in FIFO space.

 *

 *  SVGA_REG_SYNC --

 *

 *       The SYNC register can be used in two different ways by the guest:

 *

 *         1. If the guest wishes to fully sync (drain) the FIFO,

 *            it will write once to SYNC then poll on the BUSY

 *            register. The FIFO is sync'ed once BUSY is zero.

 *

 *         2. If the guest wants to asynchronously wake up the host,

 *            it will write once to SYNC without polling on BUSY.

 *            Ideally it will do this after some new commands have

 *            been placed in the FIFO, and after reading a zero

 *            from SVGA_FIFO_BUSY.

 *

 *       (1) is the original behaviour that SYNC was designed to

 *       support.  Originally, a write to SYNC would implicitly

 *       trigger a read from BUSY. This causes us to synchronously

 *       process the FIFO.

 *

 *       This behaviour has since been changed so that writing SYNC

 *       will *not* implicitly cause a read from BUSY. Instead, it

 *       makes a channel call which asynchronously wakes up the MKS

 *       thread.

 *

 *       New guests can use this new behaviour to implement (2)

 *       efficiently. This lets guests get the host's attention

 *       without waiting for the MKS to poll, which gives us much

 *       better CPU utilization on SMP hosts and on UP hosts while

 *       we're blocked on the host GPU.

 *

 *       Old guests shouldn't notice the behaviour change. SYNC was

 *       never guaranteed to process the entire FIFO, since it was

 *       bounded to a particular number of CPU cycles. Old guests will

 *       still loop on the BUSY register until the FIFO is empty.

 *

 *       Writing to SYNC currently has the following side-effects:

 *

 *         - Sets SVGA_REG_BUSY to TRUE (in the monitor)

 *         - Asynchronously wakes up the MKS thread for FIFO processing

 *         - The value written to SYNC is recorded as a "reason", for

 *           stats purposes.

 *

 *       If SVGA_FIFO_BUSY is available, drivers are advised to only

 *       write to SYNC if SVGA_FIFO_BUSY is FALSE. Drivers should set

 *       SVGA_FIFO_BUSY to TRUE after writing to SYNC. The MKS will

 *       eventually set SVGA_FIFO_BUSY on its own, but this approach

 *       lets the driver avoid sending multiple asynchronous wakeup

 *       messages to the MKS thread.

 *

 *  SVGA_REG_BUSY --

 *

 *       This register is set to TRUE when SVGA_REG_SYNC is written,

 *       and it reads as FALSE when the FIFO has been completely

 *       drained.

 *

 *       Every read from this register causes us to synchronously

 *       process FIFO commands. There is no guarantee as to how many

 *       commands each read will process.

 *

 *       CPU time spent processing FIFO commands will be billed to

 *       the guest.

 *

 *       New drivers should avoid using this register unless they

 *       need to guarantee that the FIFO is completely drained. It

 *       is overkill for performing a sync-to-fence. Older drivers

 *       will use this register for any type of synchronization.

 *

 *  SVGA_FIFO_BUSY --

 *

 *       This register is a fast way for the guest driver to check

 *       whether the FIFO is already being processed. It reads and

 *       writes at normal RAM speeds, with no monitor intervention.

 *

 *       If this register reads as TRUE, the host is guaranteeing that

 *       any new commands written into the FIFO will be noticed before

 *       the MKS goes back to sleep.

 *

 *       If this register reads as FALSE, no such guarantee can be

 *       made.

 *

 *       The guest should use this register to quickly determine

 *       whether or not it needs to wake up the host. If the guest

 *       just wrote a command or group of commands that it would like

 *       the host to begin processing, it should:

 *

 *         1. Read SVGA_FIFO_BUSY. If it reads as TRUE, no further

 *            action is necessary.

 *

 *         2. Write TRUE to SVGA_FIFO_BUSY. This informs future guest

 *            code that we've already sent a SYNC to the host and we

 *            don't need to send a duplicate.

 *

 *         3. Write a reason to SVGA_REG_SYNC. This will send an

 *            asynchronous wakeup to the MKS thread.

 */

/*

 * FIFO Capabilities

 *

 *      Fence -- Fence register and command are supported

 *      Accel Front -- Front buffer only commands are supported

 *      Pitch Lock -- Pitch lock register is supported

 *      Video -- SVGA Video overlay units are supported

 *      Escape -- Escape command is supported

 *

 * XXX: Add longer descriptions for each capability, including a list

 *      of the new features that each capability provides.

 *

 * SVGA_FIFO_CAP_SCREEN_OBJECT --

 *

 *    Provides dynamic multi-screen rendering, for improved Unity and

 *    multi-monitor modes. With Screen Object, the guest can

 *    dynamically create and destroy 'screens', which can represent

 *    Unity windows or virtual monitors. Screen Object also provides

 *    strong guarantees that DMA operations happen only when

 *    guest-initiated. Screen Object deprecates the BAR1 guest

 *    framebuffer (GFB) and all commands that work only with the GFB.

 *

 *    New registers:

 *       FIFO_CURSOR_SCREEN_ID, VIDEO_DATA_GMRID, VIDEO_DST_SCREEN_ID

 *

 *    New 2D commands:

 *       DEFINE_SCREEN, DESTROY_SCREEN, DEFINE_GMRFB, BLIT_GMRFB_TO_SCREEN,

 *       BLIT_SCREEN_TO_GMRFB, ANNOTATION_FILL, ANNOTATION_COPY

 *

 *    New 3D commands:

 *       BLIT_SURFACE_TO_SCREEN

 *

 *    New guarantees:

 *

 *       - The host will not read or write guest memory, including the GFB,

 *         except when explicitly initiated by a DMA command.

 *

 *       - All DMA, including legacy DMA like UPDATE and PRESENT_READBACK,

 *         is guaranteed to complete before any subsequent FENCEs.

 *

 *       - All legacy commands which affect a Screen (UPDATE, PRESENT,

 *         PRESENT_READBACK) as well as new Screen blit commands will

 *         all behave consistently as blits, and memory will be read

 *         or written in FIFO order.

 *

 *         For example, if you PRESENT from one SVGA3D surface to multiple

 *         places on the screen, the data copied will always be from the

 *         SVGA3D surface at the time the PRESENT was issued in the FIFO.

 *         This was not necessarily true on devices without Screen Object.

 *

 *         This means that on devices that support Screen Object, the

 *         PRESENT_READBACK command should not be necessary unless you

 *         actually want to read back the results of 3D rendering into

 *         system memory. (And for that, the BLIT_SCREEN_TO_GMRFB

 *         command provides a strict superset of functionality.)

 *

 *       - When a screen is resized, either using Screen Object commands or

 *         legacy multimon registers, its contents are preserved.

 *

 * SVGA_FIFO_CAP_GMR2 --

 *

 *    Provides new commands to define and remap guest memory regions (GMR).

 *

 *    New 2D commands:

 *       DEFINE_GMR2, REMAP_GMR2.

 *

 * SVGA_FIFO_CAP_3D_HWVERSION_REVISED --

 *

 *    Indicates new register SVGA_FIFO_3D_HWVERSION_REVISED exists.

 *    This register may replace SVGA_FIFO_3D_HWVERSION on platforms

 *    that enforce graphics resource limits.  This allows the platform

 *    to clear SVGA_FIFO_3D_HWVERSION and disable 3D in legacy guest

 *    drivers that do not limit their resources.

 *

 *    Note this is an alias to SVGA_FIFO_CAP_GMR2 because these indicators

 *    are codependent (and thus we use a single capability bit).

 *

 * SVGA_FIFO_CAP_SCREEN_OBJECT_2 --

 *

 *    Modifies the DEFINE_SCREEN command to include a guest provided

 *    backing store in GMR memory and the bytesPerLine for the backing

 *    store.  This capability requires the use of a backing store when

 *    creating screen objects.  However if SVGA_FIFO_CAP_SCREEN_OBJECT

 *    is present then backing stores are optional.

 *

 * SVGA_FIFO_CAP_DEAD --

 *

 *    Drivers should not use this cap bit.  This cap bit can not be

 *    reused since some hosts already expose it.

 */

#define SVGA_FIFO_CAP_NONE                  0

#define SVGA_FIFO_CAP_FENCE             (1<<0)

#define SVGA_FIFO_CAP_ACCELFRONT        (1<<1)

#define SVGA_FIFO_CAP_PITCHLOCK         (1<<2)

#define SVGA_FIFO_CAP_VIDEO             (1<<3)

#define SVGA_FIFO_CAP_CURSOR_BYPASS_3   (1<<4)

#define SVGA_FIFO_CAP_ESCAPE            (1<<5)

#define SVGA_FIFO_CAP_RESERVE           (1<<6)

#define SVGA_FIFO_CAP_SCREEN_OBJECT     (1<<7)

#define SVGA_FIFO_CAP_GMR2              (1<<8)

#define SVGA_FIFO_CAP_3D_HWVERSION_REVISED  SVGA_FIFO_CAP_GMR2

#define SVGA_FIFO_CAP_SCREEN_OBJECT_2   (1<<9)

#define SVGA_FIFO_CAP_DEAD              (1<<10)

/*

 * FIFO Flags

 *

 *      Accel Front -- Driver should use front buffer only commands

 */

#define SVGA_FIFO_FLAG_NONE                 0

#define SVGA_FIFO_FLAG_ACCELFRONT       (1<<0)

#define SVGA_FIFO_FLAG_RESERVED        (1<<31) /* Internal use only */

/*

 * FIFO reservation sentinel value

 */

#define SVGA_FIFO_RESERVED_UNKNOWN      0xffffffff

/*

 * Video overlay support

 */

#define SVGA_NUM_OVERLAY_UNITS 32

/*

 * Video capabilities that the guest is currently using

 */

#define SVGA_VIDEO_FLAG_COLORKEY        0x0001

/*

 * Offsets for the video overlay registers

 */

enum {

   SVGA_VIDEO_ENABLED = 0,

   SVGA_VIDEO_FLAGS,

   SVGA_VIDEO_DATA_OFFSET,

   SVGA_VIDEO_FORMAT,

   SVGA_VIDEO_COLORKEY,

   SVGA_VIDEO_SIZE,          /* Deprecated */

   SVGA_VIDEO_WIDTH,

   SVGA_VIDEO_HEIGHT,

   SVGA_VIDEO_SRC_X,

   SVGA_VIDEO_SRC_Y,

   SVGA_VIDEO_SRC_WIDTH,

   SVGA_VIDEO_SRC_HEIGHT,

   SVGA_VIDEO_DST_X,         /* Signed int32 */

   SVGA_VIDEO_DST_Y,         /* Signed int32 */

   SVGA_VIDEO_DST_WIDTH,

   SVGA_VIDEO_DST_HEIGHT,

   SVGA_VIDEO_PITCH_1,

   SVGA_VIDEO_PITCH_2,

   SVGA_VIDEO_PITCH_3,

   SVGA_VIDEO_DATA_GMRID,    /* Optional, defaults to SVGA_GMR_FRAMEBUFFER */

   SVGA_VIDEO_DST_SCREEN_ID, /* Optional, defaults to virtual coords (SVGA_ID_INVALID) */

   SVGA_VIDEO_NUM_REGS

};

/*

 * SVGA Overlay Units

 *

 *      width and height relate to the entire source video frame.

 *      srcX, srcY, srcWidth and srcHeight represent subset of the source

 *      video frame to be displayed.

 */

typedef struct SVGAOverlayUnit {

   uint32 enabled;

   uint32 flags;

   uint32 dataOffset;

   uint32 format;

   uint32 colorKey;

   uint32 size;

   uint32 width;

   uint32 height;

   uint32 srcX;

   uint32 srcY;

   uint32 srcWidth;

   uint32 srcHeight;

   int32  dstX;

   int32  dstY;

   uint32 dstWidth;

   uint32 dstHeight;

   uint32 pitches[3];

   uint32 dataGMRId;

   uint32 dstScreenId;

} SVGAOverlayUnit;

/*

 * SVGAScreenObject --

 *

 *    This is a new way to represent a guest's multi-monitor screen or

 *    Unity window. Screen objects are only supported if the

 *    SVGA_FIFO_CAP_SCREEN_OBJECT capability bit is set.

 *

 *    If Screen Objects are supported, they can be used to fully

 *    replace the functionality provided by the framebuffer registers

 *    (SVGA_REG_WIDTH, HEIGHT, etc.) and by SVGA_CAP_DISPLAY_TOPOLOGY.

 *

 *    The screen object is a struct with guaranteed binary

 *    compatibility. New flags can be added, and the struct may grow,

 *    but existing fields must retain their meaning.

 *

 *    Added with SVGA_FIFO_CAP_SCREEN_OBJECT_2 are required fields of

 *    a SVGAGuestPtr that is used to back the screen contents.  This

 *    memory must come from the GFB.  The guest is not allowed to

 *    access the memory and doing so will have undefined results.  The

 *    backing store is required to be page aligned and the size is

 *    padded to the next page boundry.  The number of pages is:

 *       (bytesPerLine * size.width * 4 + PAGE_SIZE - 1) / PAGE_SIZE

 *

 *    The pitch in the backingStore is required to be at least large

 *    enough to hold a 32bbp scanline.  It is recommended that the

 *    driver pad bytesPerLine for a potential performance win.

 *

 *    The cloneCount field is treated as a hint from the guest that

 *    the user wants this display to be cloned, countCount times.  A

 *    value of zero means no cloning should happen.

 */

#define SVGA_SCREEN_MUST_BE_SET     (1 << 0) /* Must be set or results undefined */

#define SVGA_SCREEN_HAS_ROOT SVGA_SCREEN_MUST_BE_SET /* Deprecated */

#define SVGA_SCREEN_IS_PRIMARY      (1 << 1) /* Guest considers this screen to be 'primary' */

#define SVGA_SCREEN_FULLSCREEN_HINT (1 << 2) /* Guest is running a fullscreen app here */

/*

 * Added with SVGA_FIFO_CAP_SCREEN_OBJECT_2.  When the screen is

 * deactivated the base layer is defined to lose all contents and

 * become black.  When a screen is deactivated the backing store is

 * optional.  When set backingPtr and bytesPerLine will be ignored.

 */

#define SVGA_SCREEN_DEACTIVATE  (1 << 3)

/*

 * Added with SVGA_FIFO_CAP_SCREEN_OBJECT_2.  When this flag is set

 * the screen contents will be outputted as all black to the user

 * though the base layer contents is preserved.  The screen base layer

 * can still be read and written to like normal though the no visible

 * effect will be seen by the user.  When the flag is changed the

 * screen will be blanked or redrawn to the current contents as needed

 * without any extra commands from the driver.  This flag only has an

 * effect when the screen is not deactivated.

 */

#define SVGA_SCREEN_BLANKING (1 << 4)

typedef

struct SVGAScreenObject {

   uint32 structSize;   /* sizeof(SVGAScreenObject) */

   uint32 id;

   uint32 flags;

   struct {

      uint32 width;

      uint32 height;

   } size;

   struct {

      int32 x;

      int32 y;

   } root;

   /*

    * Added and required by SVGA_FIFO_CAP_SCREEN_OBJECT_2, optional

    * with SVGA_FIFO_CAP_SCREEN_OBJECT.

    */

   SVGAGuestImage backingStore;

   uint32 cloneCount;

} SVGAScreenObject;

/*

 *  Commands in the command FIFO:

 *

 *  Command IDs defined below are used for the traditional 2D FIFO

 *  communication (not all commands are available for all versions of the

 *  SVGA FIFO protocol).

 *

 *  Note the holes in the command ID numbers: These commands have been

 *  deprecated, and the old IDs must not be reused.

 *

 *  Command IDs from 1000 to 1999 are reserved for use by the SVGA3D

 *  protocol.

 *

 *  Each command's parameters are described by the comments and

 *  structs below.

 */

typedef enum {

   SVGA_CMD_INVALID_CMD           = 0,

   SVGA_CMD_UPDATE                = 1,

   SVGA_CMD_RECT_COPY             = 3,

   SVGA_CMD_DEFINE_CURSOR         = 19,

   SVGA_CMD_DEFINE_ALPHA_CURSOR   = 22,

   SVGA_CMD_UPDATE_VERBOSE        = 25,

   SVGA_CMD_FRONT_ROP_FILL        = 29,

   SVGA_CMD_FENCE                 = 30,

   SVGA_CMD_ESCAPE                = 33,

   SVGA_CMD_DEFINE_SCREEN         = 34,

   SVGA_CMD_DESTROY_SCREEN        = 35,

   SVGA_CMD_DEFINE_GMRFB          = 36,

   SVGA_CMD_BLIT_GMRFB_TO_SCREEN  = 37,

   SVGA_CMD_BLIT_SCREEN_TO_GMRFB  = 38,

   SVGA_CMD_ANNOTATION_FILL       = 39,

   SVGA_CMD_ANNOTATION_COPY       = 40,

   SVGA_CMD_DEFINE_GMR2           = 41,

   SVGA_CMD_REMAP_GMR2            = 42,

   SVGA_CMD_MAX

} SVGAFifoCmdId;

#define SVGA_CMD_MAX_ARGS           64

/*

 * SVGA_CMD_UPDATE --

 *

 *    This is a DMA transfer which copies from the Guest Framebuffer

 *    (GFB) at BAR1 + SVGA_REG_FB_OFFSET to any screens which

 *    intersect with the provided virtual rectangle.

 *

 *    This command does not support using arbitrary guest memory as a

 *    data source- it only works with the pre-defined GFB memory.

 *    This command also does not support signed virtual coordinates.

 *    If you have defined screens (using SVGA_CMD_DEFINE_SCREEN) with

 *    negative root x/y coordinates, the negative portion of those

 *    screens will not be reachable by this command.

 *

 *    This command is not necessary when using framebuffer

 *    traces. Traces are automatically enabled if the SVGA FIFO is

 *    disabled, and you may explicitly enable/disable traces using

 *    SVGA_REG_TRACES. With traces enabled, any write to the GFB will

 *    automatically act as if a subsequent SVGA_CMD_UPDATE was issued.

 *

 *    Traces and SVGA_CMD_UPDATE are the only supported ways to render

 *    pseudocolor screen updates. The newer Screen Object commands

 *    only support true color formats.

 *

 * Availability:

 *    Always available.

 */

typedef

struct SVGAFifoCmdUpdate {

   uint32 x;

   uint32 y;

   uint32 width;

   uint32 height;

} SVGAFifoCmdUpdate;

/*

 * SVGA_CMD_RECT_COPY --

 *

 *    Perform a rectangular DMA transfer from one area of the GFB to

 *    another, and copy the result to any screens which intersect it.

 *

 * Availability:

 *    SVGA_CAP_RECT_COPY

 */

typedef

struct SVGAFifoCmdRectCopy {

   uint32 srcX;

   uint32 srcY;

   uint32 destX;

   uint32 destY;

   uint32 width;

   uint32 height;

} SVGAFifoCmdRectCopy;

/*

 * SVGA_CMD_DEFINE_CURSOR --

 *

 *    Provide a new cursor image, as an AND/XOR mask.

 *

 *    The recommended way to position the cursor overlay is by using

 *    the SVGA_FIFO_CURSOR_* registers, supported by the

 *    SVGA_FIFO_CAP_CURSOR_BYPASS_3 capability.

 *

 * Availability:

 *    SVGA_CAP_CURSOR

 */

typedef

struct SVGAFifoCmdDefineCursor {

   uint32 id;             /* Reserved, must be zero. */

   uint32 hotspotX;

   uint32 hotspotY;

   uint32 width;

   uint32 height;

   uint32 andMaskDepth;   /* Value must be 1 or equal to BITS_PER_PIXEL */

   uint32 xorMaskDepth;   /* Value must be 1 or equal to BITS_PER_PIXEL */

   /*

    * Followed by scanline data for AND mask, then XOR mask.

    * Each scanline is padded to a 32-bit boundary.

   */