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