cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mach64_cursor.c (6119B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  ATI Mach64 CT/VT/GT/LT Cursor Support
      4 */
      5
      6#include <linux/fb.h>
      7#include <linux/init.h>
      8#include <linux/string.h>
      9#include "../core/fb_draw.h"
     10
     11#include <asm/io.h>
     12
     13#ifdef __sparc__
     14#include <asm/fbio.h>
     15#endif
     16
     17#include <video/mach64.h>
     18#include "atyfb.h"
     19
     20/*
     21 * The hardware cursor definition requires 2 bits per pixel. The
     22 * Cursor size reguardless of the visible cursor size is 64 pixels
     23 * by 64 lines. The total memory required to define the cursor is
     24 * 16 bytes / line for 64 lines or 1024 bytes of data. The data
     25 * must be in a contigiuos format. The 2 bit cursor code values are
     26 * as follows:
     27 *
     28 *	00 - pixel colour = CURSOR_CLR_0
     29 *	01 - pixel colour = CURSOR_CLR_1
     30 *	10 - pixel colour = transparent (current display pixel)
     31 *	11 - pixel colour = 1's complement of current display pixel
     32 *
     33 *	Cursor Offset        64 pixels		 Actual Displayed Area
     34 *            \_________________________/
     35 *	      |			|	|	|
     36 *	      |<--------------->|	|	|
     37 *	      | CURS_HORZ_OFFSET|	|	|
     38 *	      |			|_______|	|  64 Lines
     39 *	      |			   ^	|	|
     40 *	      |			   |	|	|
     41 *	      |		CURS_VERT_OFFSET|	|
     42 *	      |			   |	|	|
     43 *	      |____________________|____|	|
     44 *
     45 *
     46 * The Screen position of the top left corner of the displayed
     47 * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
     48 * when the cursor hot spot is not the top left corner and the
     49 * physical cursor position becomes negative. It will be displayed
     50 * if either the horizontal or vertical cursor position is negative
     51 *
     52 * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
     53 * to a larger number and saturate CUR_HORZ_POSN to zero.
     54 *
     55 * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
     56 * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
     57 * definitation and CUR_VERT_POSN must be saturated to zero.
     58 */
     59
     60    /*
     61     *  Hardware Cursor support.
     62     */
     63static const u8 cursor_bits_lookup[16] = {
     64	0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
     65	0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
     66};
     67
     68static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
     69{
     70	struct atyfb_par *par = (struct atyfb_par *) info->par;
     71	u16 xoff, yoff;
     72	int x, y, h;
     73
     74#ifdef __sparc__
     75	if (par->mmaped)
     76		return -EPERM;
     77#endif
     78	if (par->asleep)
     79		return -EPERM;
     80
     81	wait_for_fifo(1, par);
     82	if (cursor->enable)
     83		aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
     84			    | HWCURSOR_ENABLE, par);
     85	else
     86		aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
     87				& ~HWCURSOR_ENABLE, par);
     88
     89	/* set position */
     90	if (cursor->set & FB_CUR_SETPOS) {
     91		x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
     92		if (x < 0) {
     93			xoff = -x;
     94			x = 0;
     95		} else {
     96			xoff = 0;
     97		}
     98
     99		y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
    100		if (y < 0) {
    101			yoff = -y;
    102			y = 0;
    103		} else {
    104			yoff = 0;
    105		}
    106
    107		h = cursor->image.height;
    108
    109		/*
    110		 * In doublescan mode, the cursor location
    111		 * and heigh also needs to be doubled.
    112		 */
    113                if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
    114			y<<=1;
    115			h<<=1;
    116		}
    117		wait_for_fifo(3, par);
    118		aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
    119		aty_st_le32(CUR_HORZ_VERT_OFF,
    120			    ((u32) (64 - h + yoff) << 16) | xoff, par);
    121		aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
    122	}
    123
    124	/* Set color map */
    125	if (cursor->set & FB_CUR_SETCMAP) {
    126		u32 fg_idx, bg_idx, fg, bg;
    127
    128		fg_idx = cursor->image.fg_color;
    129		bg_idx = cursor->image.bg_color;
    130
    131		fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
    132		     ((info->cmap.green[fg_idx] & 0xff) << 16) |
    133		     ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
    134
    135		bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
    136		     ((info->cmap.green[bg_idx] & 0xff) << 16) |
    137		     ((info->cmap.blue[bg_idx] & 0xff) << 8);
    138
    139		wait_for_fifo(2, par);
    140		aty_st_le32(CUR_CLR0, bg, par);
    141		aty_st_le32(CUR_CLR1, fg, par);
    142	}
    143
    144	if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
    145	    u8 *src = (u8 *)cursor->image.data;
    146	    u8 *msk = (u8 *)cursor->mask;
    147	    u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
    148	    unsigned int width = (cursor->image.width + 7) >> 3;
    149	    unsigned int height = cursor->image.height;
    150	    unsigned int align = info->sprite.scan_align;
    151
    152	    unsigned int i, j, offset;
    153	    u8 m, b;
    154
    155	    // Clear cursor image with 1010101010...
    156	    fb_memset(dst, 0xaa, 1024);
    157
    158	    offset = align - width*2;
    159
    160	    for (i = 0; i < height; i++) {
    161		for (j = 0; j < width; j++) {
    162			u16 l = 0xaaaa;
    163			b = *src++;
    164			m = *msk++;
    165			switch (cursor->rop) {
    166			case ROP_XOR:
    167			    // Upper 4 bits of mask data
    168			    l = cursor_bits_lookup[(b ^ m) >> 4] |
    169			    // Lower 4 bits of mask
    170				    (cursor_bits_lookup[(b ^ m) & 0x0f] << 8);
    171			    break;
    172			case ROP_COPY:
    173			    // Upper 4 bits of mask data
    174			    l = cursor_bits_lookup[(b & m) >> 4] |
    175			    // Lower 4 bits of mask
    176				    (cursor_bits_lookup[(b & m) & 0x0f] << 8);
    177			    break;
    178			}
    179			/*
    180			 * If cursor size is not a multiple of 8 characters
    181			 * we must pad it with transparent pattern (0xaaaa).
    182			 */
    183			if ((j + 1) * 8 > cursor->image.width) {
    184				l = comp(l, 0xaaaa,
    185				    (1 << ((cursor->image.width & 7) * 2)) - 1);
    186			}
    187			fb_writeb(l & 0xff, dst++);
    188			fb_writeb(l >> 8, dst++);
    189		}
    190		dst += offset;
    191	    }
    192	}
    193
    194	return 0;
    195}
    196
    197int aty_init_cursor(struct fb_info *info, struct fb_ops *atyfb_ops)
    198{
    199	unsigned long addr;
    200
    201	info->fix.smem_len -= PAGE_SIZE;
    202
    203#ifdef __sparc__
    204	addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
    205	info->sprite.addr = (u8 *) addr;
    206#else
    207#ifdef __BIG_ENDIAN
    208	addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
    209	info->sprite.addr = (u8 *) ioremap(addr, 1024);
    210#else
    211	addr = (unsigned long) info->screen_base + info->fix.smem_len;
    212	info->sprite.addr = (u8 *) addr;
    213#endif
    214#endif
    215	if (!info->sprite.addr)
    216		return -ENXIO;
    217	info->sprite.size = PAGE_SIZE;
    218	info->sprite.scan_align = 16;	/* Scratch pad 64 bytes wide */
    219	info->sprite.buf_align = 16; 	/* and 64 lines tall. */
    220	info->sprite.flags = FB_PIXMAP_IO;
    221
    222	atyfb_ops->fb_cursor = atyfb_cursor;
    223
    224	return 0;
    225}
    226