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uvesafb is an enhanced version of vesafb. It uses a userspace helper (v86d) to execute calls to the x86 Video BIOS functions. The driver is not limited to any specific arch and whether it works on a given arch or not depends on that arch being supported by the userspace daemon. It has been tested on x86_32 and x86_64. A single BIOS call is represented by an instance of the uvesafb_ktask structure. This structure contains a buffer, a completion struct and a uvesafb_task substructure, containing the values of the x86 registers, a flags field and a field indicating the length of the buffer. Whenever a BIOS call is made in the driver, uvesafb_exec() builds a message using the uvesafb_task substructure and the contents of the buffer. This message is then assigned a random ack number and sent to the userspace daemon using the connector interface. The message's sequence number is used as an index for the uvfb_tasks array, which provides a mapping from the messages coming from userspace to the in-kernel uvesafb_ktask structs. The userspace daemon performs the requested operation and sends a reply in the form of a uvesafb_task struct and, optionally, a buffer. The seq and ack numbers in the reply should be exactly the same as those in the request. Each message from userspace is processed by uvesafb_cn_callback() and after passing a few sanity checks leads to the completion of a BIOS call request. Signed-off-by: Michal Januszewski <spock@gentoo.org> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Paulo Marques <pmarques@grupopie.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
194 lines
3.7 KiB
C
194 lines
3.7 KiB
C
#ifndef _UVESAFB_H
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#define _UVESAFB_H
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struct v86_regs {
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__u32 ebx;
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__u32 ecx;
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__u32 edx;
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__u32 esi;
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__u32 edi;
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__u32 ebp;
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__u32 eax;
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__u32 eip;
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__u32 eflags;
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__u32 esp;
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__u16 cs;
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__u16 ss;
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__u16 es;
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__u16 ds;
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__u16 fs;
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__u16 gs;
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};
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/* Task flags */
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#define TF_VBEIB 0x01
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#define TF_BUF_ESDI 0x02
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#define TF_BUF_ESBX 0x04
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#define TF_BUF_RET 0x08
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#define TF_EXIT 0x10
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struct uvesafb_task {
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__u8 flags;
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int buf_len;
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struct v86_regs regs;
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};
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/* Constants for the capabilities field
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* in vbe_ib */
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#define VBE_CAP_CAN_SWITCH_DAC 0x01
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#define VBE_CAP_VGACOMPAT 0x02
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/* The VBE Info Block */
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struct vbe_ib {
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char vbe_signature[4];
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__u16 vbe_version;
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__u32 oem_string_ptr;
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__u32 capabilities;
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__u32 mode_list_ptr;
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__u16 total_memory;
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__u16 oem_software_rev;
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__u32 oem_vendor_name_ptr;
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__u32 oem_product_name_ptr;
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__u32 oem_product_rev_ptr;
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__u8 reserved[222];
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char oem_data[256];
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char misc_data[512];
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} __attribute__ ((packed));
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#ifdef __KERNEL__
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/* VBE CRTC Info Block */
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struct vbe_crtc_ib {
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u16 horiz_total;
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u16 horiz_start;
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u16 horiz_end;
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u16 vert_total;
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u16 vert_start;
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u16 vert_end;
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u8 flags;
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u32 pixel_clock;
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u16 refresh_rate;
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u8 reserved[40];
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} __attribute__ ((packed));
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#define VBE_MODE_VGACOMPAT 0x20
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#define VBE_MODE_COLOR 0x08
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#define VBE_MODE_SUPPORTEDHW 0x01
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#define VBE_MODE_GRAPHICS 0x10
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#define VBE_MODE_LFB 0x80
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#define VBE_MODE_MASK (VBE_MODE_COLOR | VBE_MODE_SUPPORTEDHW | \
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VBE_MODE_GRAPHICS | VBE_MODE_LFB)
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/* VBE Mode Info Block */
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struct vbe_mode_ib {
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/* for all VBE revisions */
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u16 mode_attr;
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u8 winA_attr;
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u8 winB_attr;
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u16 win_granularity;
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u16 win_size;
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u16 winA_seg;
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u16 winB_seg;
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u32 win_func_ptr;
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u16 bytes_per_scan_line;
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/* for VBE 1.2+ */
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u16 x_res;
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u16 y_res;
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u8 x_char_size;
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u8 y_char_size;
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u8 planes;
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u8 bits_per_pixel;
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u8 banks;
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u8 memory_model;
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u8 bank_size;
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u8 image_pages;
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u8 reserved1;
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/* Direct color fields for direct/6 and YUV/7 memory models. */
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/* Offsets are bit positions of lsb in the mask. */
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u8 red_len;
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u8 red_off;
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u8 green_len;
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u8 green_off;
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u8 blue_len;
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u8 blue_off;
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u8 rsvd_len;
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u8 rsvd_off;
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u8 direct_color_info; /* direct color mode attributes */
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/* for VBE 2.0+ */
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u32 phys_base_ptr;
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u8 reserved2[6];
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/* for VBE 3.0+ */
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u16 lin_bytes_per_scan_line;
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u8 bnk_image_pages;
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u8 lin_image_pages;
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u8 lin_red_len;
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u8 lin_red_off;
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u8 lin_green_len;
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u8 lin_green_off;
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u8 lin_blue_len;
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u8 lin_blue_off;
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u8 lin_rsvd_len;
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u8 lin_rsvd_off;
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u32 max_pixel_clock;
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u16 mode_id;
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u8 depth;
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} __attribute__ ((packed));
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#define UVESAFB_DEFAULT_MODE "640x480-16"
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/* How long to wait for a reply from userspace [ms] */
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#define UVESAFB_TIMEOUT 5000
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/* Max number of concurrent tasks */
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#define UVESAFB_TASKS_MAX 16
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#define dac_reg (0x3c8)
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#define dac_val (0x3c9)
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struct uvesafb_pal_entry {
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u_char blue, green, red, pad;
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} __attribute__ ((packed));
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struct uvesafb_ktask {
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struct uvesafb_task t;
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void *buf;
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struct completion *done;
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u32 ack;
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};
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static int uvesafb_exec(struct uvesafb_ktask *tsk);
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#define UVESAFB_EXACT_RES 1
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#define UVESAFB_EXACT_DEPTH 2
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struct uvesafb_par {
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struct vbe_ib vbe_ib; /* VBE Info Block */
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struct vbe_mode_ib *vbe_modes; /* list of supported VBE modes */
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int vbe_modes_cnt;
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u8 nocrtc;
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u8 ypan; /* 0 - nothing, 1 - ypan, 2 - ywrap */
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u8 pmi_setpal; /* PMI for palette changes */
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u16 *pmi_base; /* protected mode interface location */
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void *pmi_start;
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void *pmi_pal;
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u8 *vbe_state_orig; /*
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* original hardware state, before the
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* driver was loaded
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*/
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u8 *vbe_state_saved; /* state saved by fb_save_state */
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int vbe_state_size;
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atomic_t ref_count;
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int mode_idx;
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struct vbe_crtc_ib crtc;
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};
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#endif /* __KERNEL__ */
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#endif /* _UVESAFB_H */
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