| // Code for manipulating VGA framebuffers. |
| // |
| // Copyright (C) 2009-2014 Kevin O'Connor <kevin@koconnor.net> |
| // Copyright (C) 2001-2008 the LGPL VGABios developers Team |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "biosvar.h" // GET_BDA |
| #include "byteorder.h" // cpu_to_be16 |
| #include "output.h" // dprintf |
| #include "stdvga.h" // stdvga_planar4_plane |
| #include "string.h" // memset_far |
| #include "vgabios.h" // vgafb_scroll |
| #include "vgahw.h" // vgahw_get_linelength |
| |
| static inline void |
| memmove_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines) |
| { |
| if (src < dst) { |
| dst += stride * (lines - 1); |
| src += stride * (lines - 1); |
| stride = -stride; |
| } |
| for (; lines; lines--, dst+=stride, src+=stride) |
| memcpy_far(seg, dst, seg, src, copylen); |
| } |
| |
| static inline void |
| memset_stride(u16 seg, void *dst, u8 val, int setlen, int stride, int lines) |
| { |
| for (; lines; lines--, dst+=stride) |
| memset_far(seg, dst, val, setlen); |
| } |
| |
| static inline void |
| memset16_stride(u16 seg, void *dst, u16 val, int setlen, int stride, int lines) |
| { |
| for (; lines; lines--, dst+=stride) |
| memset16_far(seg, dst, val, setlen); |
| } |
| |
| |
| /**************************************************************** |
| * Basic stdvga graphic manipulation |
| ****************************************************************/ |
| |
| static void |
| gfx_planar(struct gfx_op *op) |
| { |
| if (!CONFIG_VGA_STDVGA_PORTS) |
| return; |
| void *dest_far = (void*)(op->y * op->linelength + op->x / 8); |
| int plane; |
| switch (op->op) { |
| default: |
| case GO_READ8: |
| memset(op->pixels, 0, sizeof(op->pixels)); |
| for (plane = 0; plane < 4; plane++) { |
| stdvga_planar4_plane(plane); |
| u8 data = GET_FARVAR(SEG_GRAPH, *(u8*)dest_far); |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| op->pixels[pixel] |= ((data>>(7-pixel)) & 1) << plane; |
| } |
| break; |
| case GO_WRITE8: |
| for (plane = 0; plane<4; plane++) { |
| stdvga_planar4_plane(plane); |
| u8 data = 0; |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| data |= ((op->pixels[pixel]>>plane) & 1) << (7-pixel); |
| SET_FARVAR(SEG_GRAPH, *(u8*)dest_far, data); |
| } |
| break; |
| case GO_MEMSET: |
| for (plane = 0; plane < 4; plane++) { |
| stdvga_planar4_plane(plane); |
| u8 data = (op->pixels[0] & (1<<plane)) ? 0xff : 0x00; |
| memset_stride(SEG_GRAPH, dest_far, data |
| , op->xlen / 8, op->linelength, op->ylen); |
| } |
| break; |
| case GO_MEMMOVE: ; |
| void *src_far = (void*)(op->srcy * op->linelength + op->x / 8); |
| for (plane = 0; plane < 4; plane++) { |
| stdvga_planar4_plane(plane); |
| memmove_stride(SEG_GRAPH, dest_far, src_far |
| , op->xlen / 8, op->linelength, op->ylen); |
| } |
| break; |
| } |
| stdvga_planar4_plane(-1); |
| } |
| |
| static void |
| gfx_cga(struct gfx_op *op) |
| { |
| int bpp = GET_GLOBAL(op->vmode_g->depth); |
| void *dest_far = (void*)(op->y / 2 * op->linelength + op->x / 8 * bpp); |
| switch (op->op) { |
| default: |
| case GO_READ8: |
| if (op->y & 1) |
| dest_far += 0x2000; |
| if (bpp == 1) { |
| u8 data = GET_FARVAR(SEG_CTEXT, *(u8*)dest_far); |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| op->pixels[pixel] = (data >> (7-pixel)) & 1; |
| } else { |
| u16 data = GET_FARVAR(SEG_CTEXT, *(u16*)dest_far); |
| data = be16_to_cpu(data); |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| op->pixels[pixel] = (data >> ((7-pixel)*2)) & 3; |
| } |
| break; |
| case GO_WRITE8: |
| if (op->y & 1) |
| dest_far += 0x2000; |
| if (bpp == 1) { |
| u8 data = 0; |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| data |= (op->pixels[pixel] & 1) << (7-pixel); |
| SET_FARVAR(SEG_CTEXT, *(u8*)dest_far, data); |
| } else { |
| u16 data = 0; |
| int pixel; |
| for (pixel=0; pixel<8; pixel++) |
| data |= (op->pixels[pixel] & 3) << ((7-pixel) * 2); |
| data = cpu_to_be16(data); |
| SET_FARVAR(SEG_CTEXT, *(u16*)dest_far, data); |
| } |
| break; |
| case GO_MEMSET: ; |
| u8 data = op->pixels[0]; |
| if (bpp == 1) |
| data = (data&1) | ((data&1)<<1); |
| data &= 3; |
| data |= (data<<2) | (data<<4) | (data<<6); |
| memset_stride(SEG_CTEXT, dest_far, data |
| , op->xlen / 8 * bpp, op->linelength, op->ylen / 2); |
| memset_stride(SEG_CTEXT, dest_far + 0x2000, data |
| , op->xlen / 8 * bpp, op->linelength, op->ylen / 2); |
| break; |
| case GO_MEMMOVE: ; |
| void *src_far = (void*)(op->srcy / 2 * op->linelength + op->x / 8 * bpp); |
| memmove_stride(SEG_CTEXT, dest_far, src_far |
| , op->xlen / 8 * bpp, op->linelength, op->ylen / 2); |
| memmove_stride(SEG_CTEXT, dest_far + 0x2000, src_far + 0x2000 |
| , op->xlen / 8 * bpp, op->linelength, op->ylen / 2); |
| break; |
| } |
| } |
| |
| static void |
| gfx_packed(struct gfx_op *op) |
| { |
| void *dest_far = (void*)(op->y * op->linelength + op->x); |
| switch (op->op) { |
| default: |
| case GO_READ8: |
| memcpy_far(GET_SEG(SS), op->pixels, SEG_GRAPH, dest_far, 8); |
| break; |
| case GO_WRITE8: |
| memcpy_far(SEG_GRAPH, dest_far, GET_SEG(SS), op->pixels, 8); |
| break; |
| case GO_MEMSET: |
| memset_stride(SEG_GRAPH, dest_far, op->pixels[0] |
| , op->xlen, op->linelength, op->ylen); |
| break; |
| case GO_MEMMOVE: ; |
| void *src_far = (void*)(op->srcy * op->linelength + op->x); |
| memmove_stride(SEG_GRAPH, dest_far, src_far |
| , op->xlen, op->linelength, op->ylen); |
| break; |
| } |
| } |
| |
| |
| /**************************************************************** |
| * Direct framebuffers in high mem |
| ****************************************************************/ |
| |
| // Use int 1587 call to copy memory to/from the framebuffer. |
| static void |
| memcpy_high(void *dest, void *src, u32 len) |
| { |
| u64 gdt[6]; |
| gdt[2] = GDT_DATA | GDT_LIMIT(0xfffff) | GDT_BASE((u32)src); |
| gdt[3] = GDT_DATA | GDT_LIMIT(0xfffff) | GDT_BASE((u32)dest); |
| |
| // Call int 1587 to copy data. |
| len/=2; |
| u32 flags; |
| u32 eax = 0x8700; |
| u32 si = (u32)&gdt; |
| SET_SEG(ES, GET_SEG(SS)); |
| asm volatile( |
| "stc\n" |
| "int $0x15\n" |
| "cli\n" |
| "cld\n" |
| "pushfl\n" |
| "popl %0\n" |
| : "=r" (flags), "+a" (eax), "+S" (si), "+c" (len) |
| : : "cc", "memory"); |
| } |
| |
| static void |
| memmove_stride_high(void *dst, void *src, int copylen, int stride, int lines) |
| { |
| if (src < dst) { |
| dst += stride * (lines - 1); |
| src += stride * (lines - 1); |
| stride = -stride; |
| } |
| for (; lines; lines--, dst+=stride, src+=stride) |
| memcpy_high(dst, src, copylen); |
| } |
| |
| // Map a CGA color to a "direct" mode rgb value. |
| static u32 |
| get_color(int depth, u8 attr) |
| { |
| int rbits, gbits, bbits; |
| switch (depth) { |
| case 15: rbits=5; gbits=5; bbits=5; break; |
| case 16: rbits=5; gbits=6; bbits=5; break; |
| default: |
| case 24: rbits=8; gbits=8; bbits=8; break; |
| } |
| int h = (attr&8) ? 1 : 0; |
| int r = (attr&4) ? 2 : 0, g = (attr&2) ? 2 : 0, b = (attr&1) ? 2 : 0; |
| if ((attr & 0xf) == 6) |
| g = 1; |
| int rv = DIV_ROUND_CLOSEST(((1<<rbits) - 1) * (r + h), 3); |
| int gv = DIV_ROUND_CLOSEST(((1<<gbits) - 1) * (g + h), 3); |
| int bv = DIV_ROUND_CLOSEST(((1<<bbits) - 1) * (b + h), 3); |
| return (rv << (gbits+bbits)) + (gv << bbits) + bv; |
| } |
| |
| // Find the closest attribute for a given framebuffer color |
| static u8 |
| reverse_color(int depth, u32 color) |
| { |
| int rbits, gbits, bbits; |
| switch (depth) { |
| case 15: rbits=5; gbits=5; bbits=5; break; |
| case 16: rbits=5; gbits=6; bbits=5; break; |
| default: |
| case 24: rbits=8; gbits=8; bbits=8; break; |
| } |
| int rv = (color >> (gbits+bbits)) & ((1<<rbits)-1); |
| int gv = (color >> bbits) & ((1<<gbits)-1); |
| int bv = color & ((1<<bbits)-1); |
| int r = DIV_ROUND_CLOSEST(rv * 3, (1<<rbits) - 1); |
| int g = DIV_ROUND_CLOSEST(gv * 3, (1<<gbits) - 1); |
| int b = DIV_ROUND_CLOSEST(bv * 3, (1<<bbits) - 1); |
| int h = r && g && b && (r != 2 || g != 2 || b != 2); |
| return (h ? 8 : 0) | ((r-h) ? 4 : 0) | ((g-h) ? 2 : 0) | ((b-h) ? 1 : 0); |
| } |
| |
| static void |
| gfx_direct(struct gfx_op *op) |
| { |
| void *fb = (void*)GET_GLOBAL(VBE_framebuffer); |
| if (!fb) |
| return; |
| int depth = GET_GLOBAL(op->vmode_g->depth); |
| int bypp = DIV_ROUND_UP(depth, 8); |
| void *dest_far = (fb + op->displaystart + op->y * op->linelength |
| + op->x * bypp); |
| switch (op->op) { |
| default: |
| case GO_READ8: { |
| u8 data[64]; |
| memcpy_high(MAKE_FLATPTR(GET_SEG(SS), data), dest_far, bypp * 8); |
| int i; |
| for (i=0; i<8; i++) |
| op->pixels[i] = reverse_color(depth, *(u32*)&data[i*bypp]); |
| break; |
| } |
| case GO_WRITE8: { |
| u8 data[64]; |
| int i; |
| for (i=0; i<8; i++) |
| *(u32*)&data[i*bypp] = get_color(depth, op->pixels[i]); |
| memcpy_high(dest_far, MAKE_FLATPTR(GET_SEG(SS), data), bypp * 8); |
| break; |
| } |
| case GO_MEMSET: { |
| u32 color = get_color(depth, op->pixels[0]); |
| u8 data[64]; |
| int i; |
| for (i=0; i<8; i++) |
| *(u32*)&data[i*bypp] = color; |
| memcpy_high(dest_far, MAKE_FLATPTR(GET_SEG(SS), data), bypp * 8); |
| memcpy_high(dest_far + bypp * 8, dest_far, op->xlen * bypp - bypp * 8); |
| for (i=1; i < op->ylen; i++) |
| memcpy_high(dest_far + op->linelength * i |
| , dest_far, op->xlen * bypp); |
| break; |
| } |
| case GO_MEMMOVE: ; |
| void *src_far = (fb + op->displaystart + op->srcy * op->linelength |
| + op->x * bypp); |
| memmove_stride_high(dest_far, src_far |
| , op->xlen * bypp, op->linelength, op->ylen); |
| break; |
| } |
| } |
| |
| |
| /**************************************************************** |
| * Gfx interface |
| ****************************************************************/ |
| |
| // Prepare a struct gfx_op for use. |
| void |
| init_gfx_op(struct gfx_op *op, struct vgamode_s *vmode_g) |
| { |
| memset(op, 0, sizeof(*op)); |
| op->vmode_g = vmode_g; |
| op->linelength = vgahw_get_linelength(vmode_g); |
| op->displaystart = vgahw_get_displaystart(vmode_g); |
| } |
| |
| // Issue a graphics operation. |
| void |
| handle_gfx_op(struct gfx_op *op) |
| { |
| switch (GET_GLOBAL(op->vmode_g->memmodel)) { |
| case MM_PLANAR: |
| gfx_planar(op); |
| break; |
| case MM_CGA: |
| gfx_cga(op); |
| break; |
| case MM_PACKED: |
| gfx_packed(op); |
| break; |
| case MM_DIRECT: |
| gfx_direct(op); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| // Move characters when in graphics mode. |
| static void |
| gfx_move_chars(struct vgamode_s *vmode_g, struct cursorpos dest |
| , struct cursorpos src, struct cursorpos movesize) |
| { |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = dest.x * 8; |
| op.xlen = movesize.x * 8; |
| int cheight = GET_BDA(char_height); |
| op.y = dest.y * cheight; |
| op.ylen = movesize.y * cheight; |
| op.srcy = src.y * cheight; |
| op.op = GO_MEMMOVE; |
| handle_gfx_op(&op); |
| } |
| |
| // Clear area of screen in graphics mode. |
| static void |
| gfx_clear_chars(struct vgamode_s *vmode_g, struct cursorpos dest |
| , struct carattr ca, struct cursorpos clearsize) |
| { |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = dest.x * 8; |
| op.xlen = clearsize.x * 8; |
| int cheight = GET_BDA(char_height); |
| op.y = dest.y * cheight; |
| op.ylen = clearsize.y * cheight; |
| op.pixels[0] = ca.attr; |
| if (vga_emulate_text()) |
| op.pixels[0] = ca.attr >> 4; |
| op.op = GO_MEMSET; |
| handle_gfx_op(&op); |
| } |
| |
| // Return the font for a given character |
| struct segoff_s |
| get_font_data(u8 c) |
| { |
| int char_height = GET_BDA(char_height); |
| struct segoff_s font; |
| if (char_height == 8 && c >= 128) { |
| font = GET_IVT(0x1f); |
| c -= 128; |
| } else { |
| font = GET_IVT(0x43); |
| } |
| font.offset += c * char_height; |
| return font; |
| } |
| |
| // Write a character to the screen in graphics mode. |
| static void |
| gfx_write_char(struct vgamode_s *vmode_g |
| , struct cursorpos cp, struct carattr ca) |
| { |
| if (cp.x >= GET_BDA(video_cols)) |
| return; |
| |
| struct segoff_s font = get_font_data(ca.car); |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = cp.x * 8; |
| int cheight = GET_BDA(char_height); |
| op.y = cp.y * cheight; |
| u8 fgattr = ca.attr, bgattr = 0x00; |
| int usexor = 0; |
| if (vga_emulate_text()) { |
| if (ca.use_attr) { |
| bgattr = fgattr >> 4; |
| fgattr = fgattr & 0x0f; |
| } else { |
| // Read bottom right pixel of the cell to guess bg color |
| op.op = GO_READ8; |
| op.y += cheight-1; |
| handle_gfx_op(&op); |
| op.y -= cheight-1; |
| bgattr = op.pixels[7]; |
| fgattr = bgattr ^ 0x7; |
| } |
| } else if (fgattr & 0x80 && GET_GLOBAL(vmode_g->depth) < 8) { |
| usexor = 1; |
| fgattr &= 0x7f; |
| } |
| int i; |
| for (i = 0; i < cheight; i++, op.y++) { |
| u8 fontline = GET_FARVAR(font.seg, *(u8*)(font.offset+i)); |
| if (usexor) { |
| op.op = GO_READ8; |
| handle_gfx_op(&op); |
| int j; |
| for (j = 0; j < 8; j++) |
| op.pixels[j] ^= (fontline & (0x80>>j)) ? fgattr : 0x00; |
| } else { |
| int j; |
| for (j = 0; j < 8; j++) |
| op.pixels[j] = (fontline & (0x80>>j)) ? fgattr : bgattr; |
| } |
| op.op = GO_WRITE8; |
| handle_gfx_op(&op); |
| } |
| } |
| |
| // Read a character from the screen in graphics mode. |
| static struct carattr |
| gfx_read_char(struct vgamode_s *vmode_g, struct cursorpos cp) |
| { |
| u8 lines[16]; |
| int cheight = GET_BDA(char_height); |
| if (cp.x >= GET_BDA(video_cols) || cheight > ARRAY_SIZE(lines)) |
| goto fail; |
| |
| // Read cell from screen |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.op = GO_READ8; |
| op.x = cp.x * 8; |
| op.y = cp.y * cheight; |
| int car = 0; |
| u8 fgattr = 0x00, bgattr = 0x00; |
| if (vga_emulate_text()) { |
| // Read bottom right pixel of the cell to guess bg color |
| op.y += cheight-1; |
| handle_gfx_op(&op); |
| op.y -= cheight-1; |
| bgattr = op.pixels[7]; |
| fgattr = bgattr ^ 0x7; |
| // Report space character for blank cells (skip null character check) |
| car = 1; |
| } |
| u8 i, j; |
| for (i=0; i<cheight; i++, op.y++) { |
| u8 line = 0; |
| handle_gfx_op(&op); |
| for (j=0; j<8; j++) |
| if (op.pixels[j] != bgattr) { |
| line |= 0x80 >> j; |
| fgattr = op.pixels[j]; |
| } |
| lines[i] = line; |
| } |
| |
| // Determine font |
| for (; car<256; car++) { |
| struct segoff_s font = get_font_data(car); |
| if (memcmp_far(GET_SEG(SS), lines |
| , font.seg, (void*)(font.offset+0), cheight) == 0) |
| return (struct carattr){car, fgattr | (bgattr << 4), 0}; |
| } |
| fail: |
| return (struct carattr){0, 0, 0}; |
| } |
| |
| // Draw/undraw a cursor on the framebuffer by xor'ing the cursor cell |
| void |
| gfx_set_swcursor(struct vgamode_s *vmode_g, int enable, struct cursorpos cp) |
| { |
| u16 cursor_type = get_cursor_shape(); |
| u8 start = cursor_type >> 8, end = cursor_type & 0xff; |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = cp.x * 8; |
| int cheight = GET_BDA(char_height); |
| op.y = cp.y * cheight + start; |
| |
| int i; |
| for (i = start; i < cheight && i <= end; i++, op.y++) { |
| op.op = GO_READ8; |
| handle_gfx_op(&op); |
| int j; |
| for (j = 0; j < 8; j++) |
| op.pixels[j] ^= 0x07; |
| op.op = GO_WRITE8; |
| handle_gfx_op(&op); |
| } |
| } |
| |
| // Set the pixel at the given position. |
| void |
| vgafb_write_pixel(u8 color, u16 x, u16 y) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| vgafb_set_swcursor(0); |
| |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = ALIGN_DOWN(x, 8); |
| op.y = y; |
| op.op = GO_READ8; |
| handle_gfx_op(&op); |
| |
| int usexor = color & 0x80 && GET_GLOBAL(vmode_g->depth) < 8; |
| if (usexor) |
| op.pixels[x & 0x07] ^= color & 0x7f; |
| else |
| op.pixels[x & 0x07] = color; |
| op.op = GO_WRITE8; |
| handle_gfx_op(&op); |
| } |
| |
| // Return the pixel at the given position. |
| u8 |
| vgafb_read_pixel(u16 x, u16 y) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return 0; |
| vgafb_set_swcursor(0); |
| |
| struct gfx_op op; |
| init_gfx_op(&op, vmode_g); |
| op.x = ALIGN_DOWN(x, 8); |
| op.y = y; |
| op.op = GO_READ8; |
| handle_gfx_op(&op); |
| |
| return op.pixels[x & 0x07]; |
| } |
| |
| |
| /**************************************************************** |
| * Text ops |
| ****************************************************************/ |
| |
| // Return the fb offset for the given character address when in text mode. |
| void * |
| text_address(struct cursorpos cp) |
| { |
| int stride = GET_BDA(video_cols) * 2; |
| u32 pageoffset = GET_BDA(video_pagesize) * cp.page; |
| return (void*)pageoffset + cp.y * stride + cp.x * 2; |
| } |
| |
| // Move characters on screen. |
| void |
| vgafb_move_chars(struct cursorpos dest |
| , struct cursorpos src, struct cursorpos movesize) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| vgafb_set_swcursor(0); |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) { |
| gfx_move_chars(vmode_g, dest, src, movesize); |
| return; |
| } |
| |
| int stride = GET_BDA(video_cols) * 2; |
| memmove_stride(GET_GLOBAL(vmode_g->sstart) |
| , text_address(dest), text_address(src) |
| , movesize.x * 2, stride, movesize.y); |
| } |
| |
| // Clear area of screen. |
| void |
| vgafb_clear_chars(struct cursorpos dest |
| , struct carattr ca, struct cursorpos clearsize) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| vgafb_set_swcursor(0); |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) { |
| gfx_clear_chars(vmode_g, dest, ca, clearsize); |
| return; |
| } |
| |
| int stride = GET_BDA(video_cols) * 2; |
| u16 attr = ((ca.use_attr ? ca.attr : 0x07) << 8) | ca.car; |
| memset16_stride(GET_GLOBAL(vmode_g->sstart), text_address(dest), attr |
| , clearsize.x * 2, stride, clearsize.y); |
| } |
| |
| // Write a character to the screen. |
| void |
| vgafb_write_char(struct cursorpos cp, struct carattr ca) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| vgafb_set_swcursor(0); |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) { |
| gfx_write_char(vmode_g, cp, ca); |
| return; |
| } |
| |
| void *dest_far = text_address(cp); |
| if (ca.use_attr) { |
| u16 dummy = (ca.attr << 8) | ca.car; |
| SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)dest_far, dummy); |
| } else { |
| SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)dest_far, ca.car); |
| } |
| } |
| |
| // Return the character at the given position on the screen. |
| struct carattr |
| vgafb_read_char(struct cursorpos cp) |
| { |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return (struct carattr){0, 0, 0}; |
| vgafb_set_swcursor(0); |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) |
| return gfx_read_char(vmode_g, cp); |
| |
| u16 *dest_far = text_address(cp); |
| u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *dest_far); |
| return (struct carattr){v, v>>8, 0}; |
| } |
| |
| // Draw/undraw a cursor on the screen |
| void |
| vgafb_set_swcursor(int enable) |
| { |
| if (!vga_emulate_text()) |
| return; |
| u8 flags = GET_BDA_EXT(flags); |
| if (!!(flags & BF_SWCURSOR) == enable) |
| // Already in requested mode. |
| return; |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| struct cursorpos cp = get_cursor_pos(0xff); |
| if (cp.x >= GET_BDA(video_cols) || cp.y > GET_BDA(video_rows) |
| || GET_BDA(cursor_type) >= 0x2000) |
| // Cursor not visible |
| return; |
| |
| SET_BDA_EXT(flags, (flags & ~BF_SWCURSOR) | (enable ? BF_SWCURSOR : 0)); |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) { |
| gfx_set_swcursor(vmode_g, enable, cp); |
| return; |
| } |
| |
| // In text mode, swap foreground and background attributes for cursor |
| void *dest_far = text_address(cp) + 1; |
| u8 attr = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)dest_far); |
| attr = (attr >> 4) | (attr << 4); |
| SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)dest_far, attr); |
| } |
