127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
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/* SPDX-License-Identifier: MIT */
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/*
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* fbif.h -- Xen virtual frame buffer device
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*
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* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
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*/
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#ifndef __XEN_PUBLIC_IO_FBIF_H__
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#define __XEN_PUBLIC_IO_FBIF_H__
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/* Out events (frontend -> backend) */
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/*
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* Out events may be sent only when requested by backend, and receipt
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* of an unknown out event is an error.
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*/
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/* Event type 1 currently not used */
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/*
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* Framebuffer update notification event
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* Capable frontend sets feature-update in xenstore.
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* Backend requests it by setting request-update in xenstore.
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*/
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#define XENFB_TYPE_UPDATE 2
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struct xenfb_update {
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uint8_t type; /* XENFB_TYPE_UPDATE */
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int32_t x; /* source x */
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int32_t y; /* source y */
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int32_t width; /* rect width */
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int32_t height; /* rect height */
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};
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/*
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* Framebuffer resize notification event
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* Capable backend sets feature-resize in xenstore.
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*/
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#define XENFB_TYPE_RESIZE 3
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struct xenfb_resize {
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uint8_t type; /* XENFB_TYPE_RESIZE */
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int32_t width; /* width in pixels */
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int32_t height; /* height in pixels */
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int32_t stride; /* stride in bytes */
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int32_t depth; /* depth in bits */
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int32_t offset; /* start offset within framebuffer */
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};
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#define XENFB_OUT_EVENT_SIZE 40
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union xenfb_out_event {
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uint8_t type;
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struct xenfb_update update;
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struct xenfb_resize resize;
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char pad[XENFB_OUT_EVENT_SIZE];
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};
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/* In events (backend -> frontend) */
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/*
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* Frontends should ignore unknown in events.
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* No in events currently defined.
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*/
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#define XENFB_IN_EVENT_SIZE 40
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union xenfb_in_event {
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uint8_t type;
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char pad[XENFB_IN_EVENT_SIZE];
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};
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/* shared page */
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#define XENFB_IN_RING_SIZE 1024
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#define XENFB_IN_RING_LEN (XENFB_IN_RING_SIZE / XENFB_IN_EVENT_SIZE)
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#define XENFB_IN_RING_OFFS 1024
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#define XENFB_IN_RING(page) \
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((union xenfb_in_event *)((char *)(page) + XENFB_IN_RING_OFFS))
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#define XENFB_IN_RING_REF(page, idx) \
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(XENFB_IN_RING((page))[(idx) % XENFB_IN_RING_LEN])
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#define XENFB_OUT_RING_SIZE 2048
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#define XENFB_OUT_RING_LEN (XENFB_OUT_RING_SIZE / XENFB_OUT_EVENT_SIZE)
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#define XENFB_OUT_RING_OFFS (XENFB_IN_RING_OFFS + XENFB_IN_RING_SIZE)
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#define XENFB_OUT_RING(page) \
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((union xenfb_out_event *)((char *)(page) + XENFB_OUT_RING_OFFS))
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#define XENFB_OUT_RING_REF(page, idx) \
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(XENFB_OUT_RING((page))[(idx) % XENFB_OUT_RING_LEN])
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struct xenfb_page {
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uint32_t in_cons, in_prod;
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uint32_t out_cons, out_prod;
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int32_t width; /* width of the framebuffer (in pixels) */
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int32_t height; /* height of the framebuffer (in pixels) */
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uint32_t line_length; /* length of a row of pixels (in bytes) */
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uint32_t mem_length; /* length of the framebuffer (in bytes) */
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uint8_t depth; /* depth of a pixel (in bits) */
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/*
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* Framebuffer page directory
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*
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* Each directory page holds PAGE_SIZE / sizeof(*pd)
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* framebuffer pages, and can thus map up to PAGE_SIZE *
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* PAGE_SIZE / sizeof(*pd) bytes. With PAGE_SIZE == 4096 and
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* sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2
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* Megs 64 bit. 256 directories give enough room for a 512
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* Meg framebuffer with a max resolution of 12,800x10,240.
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* Should be enough for a while with room leftover for
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* expansion.
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*/
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unsigned long pd[256];
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};
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/*
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* Wart: xenkbd needs to know default resolution. Put it here until a
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* better solution is found, but don't leak it to the backend.
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*/
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#ifdef __KERNEL__
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#define XENFB_WIDTH 800
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#define XENFB_HEIGHT 600
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#define XENFB_DEPTH 32
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#endif
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#endif
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