| // Code for manipulating VGA framebuffers. |
| // |
| // Copyright (C) 2009 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 "vgabios.h" // vgafb_scroll |
| #include "biosvar.h" // GET_BDA |
| #include "util.h" // memset_far |
| #include "stdvga.h" // stdvga_planar4_plane |
| |
| |
| /**************************************************************** |
| * Screen scrolling |
| ****************************************************************/ |
| |
| static inline void * |
| memcpy_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines) |
| { |
| for (; lines; lines--, dst+=stride, src+=stride) |
| memcpy_far(seg, dst, seg, src, copylen); |
| return dst; |
| } |
| |
| 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); |
| } |
| |
| static void |
| scroll_pl4(struct vgamode_s *vmode_g, int nblines, int attr |
| , struct cursorpos ul, struct cursorpos lr) |
| { |
| int cheight = GET_GLOBAL(vmode_g->cheight); |
| int cwidth = 1; |
| int stride = GET_BDA(video_cols) * cwidth; |
| void *src_far, *dest_far; |
| if (nblines >= 0) { |
| dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far + nblines * cheight * stride; |
| } else { |
| // Scroll down |
| nblines = -nblines; |
| dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far - nblines * cheight * stride; |
| stride = -stride; |
| } |
| if (attr < 0) |
| attr = 0; |
| int cols = lr.x - ul.x + 1; |
| int rows = lr.y - ul.y + 1; |
| int i; |
| for (i=0; i<4; i++) { |
| stdvga_planar4_plane(i); |
| void *dest = dest_far; |
| if (nblines < rows) |
| dest = memcpy_stride(SEG_GRAPH, dest, src_far, cols * cwidth |
| , stride, (rows - nblines) * cheight); |
| u8 pixels = (attr & (1<<i)) ? 0xff : 0x00; |
| memset_stride(SEG_GRAPH, dest, pixels, cols * cwidth |
| , stride, nblines * cheight); |
| } |
| stdvga_planar4_plane(-1); |
| } |
| |
| static void |
| scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr |
| , struct cursorpos ul, struct cursorpos lr) |
| { |
| int cheight = GET_GLOBAL(vmode_g->cheight) / 2; |
| int cwidth = GET_GLOBAL(vmode_g->depth); |
| int stride = GET_BDA(video_cols) * cwidth; |
| void *src_far, *dest_far; |
| if (nblines >= 0) { |
| dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far + nblines * cheight * stride; |
| } else { |
| // Scroll down |
| nblines = -nblines; |
| dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far - nblines * cheight * stride; |
| stride = -stride; |
| } |
| if (attr < 0) |
| attr = 0; |
| if (cwidth == 1) |
| attr = (attr&1) | ((attr&1)<<1); |
| attr &= 3; |
| attr |= (attr<<2) | (attr<<4) | (attr<<6); |
| int cols = lr.x - ul.x + 1; |
| int rows = lr.y - ul.y + 1; |
| if (nblines < rows) { |
| memcpy_stride(SEG_CTEXT, dest_far+0x2000, src_far+0x2000, cols * cwidth |
| , stride, (rows - nblines) * cheight); |
| dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols * cwidth |
| , stride, (rows - nblines) * cheight); |
| } |
| memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols * cwidth |
| , stride, nblines * cheight); |
| memset_stride(SEG_CTEXT, dest_far, attr, cols * cwidth |
| , stride, nblines * cheight); |
| } |
| |
| static void |
| scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr |
| , struct cursorpos ul, struct cursorpos lr) |
| { |
| int cheight = 8; |
| int cwidth = 8; |
| int stride = GET_BDA(video_cols) * cwidth; |
| void *src_far, *dest_far; |
| if (nblines >= 0) { |
| dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far + nblines * cheight * stride; |
| } else { |
| // Scroll down |
| nblines = -nblines; |
| dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth); |
| src_far = dest_far - nblines * cheight * stride; |
| stride = -stride; |
| } |
| if (attr < 0) |
| attr = 0; |
| int cols = lr.x - ul.x + 1; |
| int rows = lr.y - ul.y + 1; |
| if (nblines < rows) |
| dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth |
| , stride, (rows - nblines) * cheight); |
| memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth |
| , stride, nblines * cheight); |
| } |
| |
| static void |
| scroll_text(struct vgamode_s *vmode_g, int nblines, int attr |
| , struct cursorpos ul, struct cursorpos lr) |
| { |
| int cheight = 1; |
| int cwidth = 2; |
| int stride = GET_BDA(video_cols) * cwidth; |
| void *src_far, *dest_far = (void*)(GET_BDA(video_pagesize) * ul.page); |
| if (nblines >= 0) { |
| dest_far += ul.y * cheight * stride + ul.x * cwidth; |
| src_far = dest_far + nblines * cheight * stride; |
| } else { |
| // Scroll down |
| nblines = -nblines; |
| dest_far += lr.y * cheight * stride + ul.x * cwidth; |
| src_far = dest_far - nblines * cheight * stride; |
| stride = -stride; |
| } |
| if (attr < 0) |
| attr = 0x07; |
| attr = (attr << 8) | ' '; |
| int cols = lr.x - ul.x + 1; |
| int rows = lr.y - ul.y + 1; |
| u16 seg = GET_GLOBAL(vmode_g->sstart); |
| if (nblines < rows) |
| dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth |
| , stride, (rows - nblines) * cheight); |
| memset16_stride(seg, dest_far, attr, cols * cwidth |
| , stride, nblines * cheight); |
| } |
| |
| void |
| vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr) |
| { |
| // Get the mode |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| |
| // FIXME gfx mode not complete |
| switch (GET_GLOBAL(vmode_g->memmodel)) { |
| case MM_TEXT: |
| scroll_text(vmode_g, nblines, attr, ul, lr); |
| break; |
| case MM_PLANAR: |
| scroll_pl4(vmode_g, nblines, attr, ul, lr); |
| break; |
| case MM_CGA: |
| scroll_cga(vmode_g, nblines, attr, ul, lr); |
| break; |
| case MM_DIRECT: |
| case MM_PACKED: |
| scroll_lin(vmode_g, nblines, attr, ul, lr); |
| break; |
| } |
| } |
| |
| |
| /**************************************************************** |
| * Read/write characters to screen |
| ****************************************************************/ |
| |
| static void |
| write_gfx_char_pl4(struct vgamode_s *vmode_g |
| , struct cursorpos cp, struct carattr ca) |
| { |
| u16 nbcols = GET_BDA(video_cols); |
| if (cp.x >= nbcols) |
| return; |
| |
| u8 cheight = GET_GLOBAL(vmode_g->cheight); |
| u8 *fdata_g; |
| switch (cheight) { |
| case 14: |
| fdata_g = vgafont14; |
| break; |
| case 16: |
| fdata_g = vgafont16; |
| break; |
| default: |
| fdata_g = vgafont8; |
| } |
| u16 addr = cp.x + cp.y * cheight * nbcols; |
| u16 src = ca.car * cheight; |
| int i; |
| for (i=0; i<4; i++) { |
| stdvga_planar4_plane(i); |
| u8 colors = ((ca.attr & (1<<i)) ? 0xff : 0x00); |
| int j; |
| for (j = 0; j < cheight; j++) { |
| u8 *dest_far = (void*)(addr + j * nbcols); |
| u8 pixels = colors & GET_GLOBAL(fdata_g[src + j]); |
| if (ca.attr & 0x80) |
| pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far); |
| SET_FARVAR(SEG_GRAPH, *dest_far, pixels); |
| } |
| } |
| stdvga_planar4_plane(-1); |
| } |
| |
| static void |
| write_gfx_char_cga(struct vgamode_s *vmode_g |
| , struct cursorpos cp, struct carattr ca) |
| { |
| u16 nbcols = GET_BDA(video_cols); |
| if (cp.x >= nbcols) |
| return; |
| |
| u8 *fdata_g = vgafont8; |
| u8 bpp = GET_GLOBAL(vmode_g->depth); |
| u16 addr = (cp.x * bpp) + cp.y * 320; |
| u16 src = ca.car * 8; |
| u8 i; |
| for (i = 0; i < 8; i++) { |
| u8 *dest_far = (void*)(addr + (i >> 1) * 80); |
| if (i & 1) |
| dest_far += 0x2000; |
| if (bpp == 1) { |
| u8 colors = (ca.attr & 0x01) ? 0xff : 0x00; |
| u8 pixels = colors & GET_GLOBAL(fdata_g[src + i]); |
| if (ca.attr & 0x80) |
| pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far); |
| SET_FARVAR(SEG_CTEXT, *dest_far, pixels); |
| } else { |
| u16 pixels = 0; |
| u8 fontline = GET_GLOBAL(fdata_g[src + i]); |
| int j; |
| for (j = 0; j < 8; j++) |
| if (fontline & (1<<j)) |
| pixels |= (ca.attr & 0x03) << (j*2); |
| pixels = htons(pixels); |
| if (ca.attr & 0x80) |
| pixels ^= GET_FARVAR(SEG_GRAPH, *(u16*)dest_far); |
| SET_FARVAR(SEG_CTEXT, *(u16*)dest_far, pixels); |
| } |
| } |
| } |
| |
| static void |
| write_gfx_char_lin(struct vgamode_s *vmode_g |
| , struct cursorpos cp, struct carattr ca) |
| { |
| // Get the dimensions |
| u16 nbcols = GET_BDA(video_cols); |
| if (cp.x >= nbcols) |
| return; |
| |
| u8 *fdata_g = vgafont8; |
| u16 addr = cp.x * 8 + cp.y * nbcols * 64; |
| u16 src = ca.car * 8; |
| u8 i; |
| for (i = 0; i < 8; i++) { |
| u8 *dest_far = (void*)(addr + i * nbcols * 8); |
| u8 fontline = GET_GLOBAL(fdata_g[src + i]); |
| u8 j; |
| for (j = 0; j < 8; j++) { |
| u8 pixel = (fontline & (0x80>>j)) ? ca.attr : 0x00; |
| SET_FARVAR(SEG_GRAPH, dest_far[j], pixel); |
| } |
| } |
| } |
| |
| static void |
| write_text_char(struct vgamode_s *vmode_g |
| , struct cursorpos cp, struct carattr ca) |
| { |
| // Compute the address |
| u16 nbcols = GET_BDA(video_cols); |
| void *address_far = (void*)(GET_BDA(video_pagesize) * cp.page |
| + (cp.x + cp.y * nbcols) * 2); |
| |
| if (ca.use_attr) { |
| u16 dummy = (ca.attr << 8) | ca.car; |
| SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy); |
| } else { |
| SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car); |
| } |
| } |
| |
| void |
| vgafb_write_char(struct cursorpos cp, struct carattr ca) |
| { |
| // Get the mode |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| |
| // FIXME gfx mode not complete |
| switch (GET_GLOBAL(vmode_g->memmodel)) { |
| case MM_TEXT: |
| write_text_char(vmode_g, cp, ca); |
| break; |
| case MM_PLANAR: |
| write_gfx_char_pl4(vmode_g, cp, ca); |
| break; |
| case MM_CGA: |
| write_gfx_char_cga(vmode_g, cp, ca); |
| break; |
| case MM_DIRECT: |
| case MM_PACKED: |
| write_gfx_char_lin(vmode_g, cp, ca); |
| break; |
| } |
| } |
| |
| struct carattr |
| vgafb_read_char(struct cursorpos cp) |
| { |
| // Get the mode |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| goto fail; |
| |
| if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) { |
| // FIXME gfx mode |
| dprintf(1, "Read char in graphics mode\n"); |
| goto fail; |
| } |
| |
| // Compute the address |
| u16 nbcols = GET_BDA(video_cols); |
| u16 *address_far = (void*)(GET_BDA(video_pagesize) * cp.page |
| + (cp.x + cp.y * nbcols) * 2); |
| u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far); |
| struct carattr ca = {v, v>>8, 0}; |
| return ca; |
| |
| fail: ; |
| struct carattr ca2 = {0, 0, 0}; |
| return ca2; |
| } |
| |
| |
| /**************************************************************** |
| * Read/write pixels |
| ****************************************************************/ |
| |
| void |
| vgafb_write_pixel(u8 color, u16 x, u16 y) |
| { |
| // Get the mode |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return; |
| |
| u8 *addr_far, mask, attr, data, i; |
| switch (GET_GLOBAL(vmode_g->memmodel)) { |
| case MM_PLANAR: |
| addr_far = (void*)(x / 8 + y * GET_BDA(video_cols)); |
| mask = 0x80 >> (x & 0x07); |
| for (i=0; i<4; i++) { |
| stdvga_planar4_plane(i); |
| u8 colors = (color & (1<<i)) ? 0xff : 0x00; |
| u8 orig = GET_FARVAR(SEG_GRAPH, *addr_far); |
| if (color & 0x80) |
| colors ^= orig; |
| SET_FARVAR(SEG_GRAPH, *addr_far, (colors & mask) | (orig & ~mask)); |
| } |
| stdvga_planar4_plane(-1); |
| break; |
| case MM_CGA: |
| if (GET_GLOBAL(vmode_g->depth) == 2) |
| addr_far = (void*)((x >> 2) + (y >> 1) * 80); |
| else |
| addr_far = (void*)((x >> 3) + (y >> 1) * 80); |
| if (y & 1) |
| addr_far += 0x2000; |
| data = GET_FARVAR(SEG_CTEXT, *addr_far); |
| if (GET_GLOBAL(vmode_g->depth) == 2) { |
| attr = (color & 0x03) << ((3 - (x & 0x03)) * 2); |
| mask = 0x03 << ((3 - (x & 0x03)) * 2); |
| } else { |
| attr = (color & 0x01) << (7 - (x & 0x07)); |
| mask = 0x01 << (7 - (x & 0x07)); |
| } |
| if (color & 0x80) { |
| data ^= attr; |
| } else { |
| data &= ~mask; |
| data |= attr; |
| } |
| SET_FARVAR(SEG_CTEXT, *addr_far, data); |
| break; |
| case MM_DIRECT: |
| case MM_PACKED: |
| addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8)); |
| SET_FARVAR(SEG_GRAPH, *addr_far, color); |
| break; |
| case MM_TEXT: |
| return; |
| } |
| } |
| |
| u8 |
| vgafb_read_pixel(u16 x, u16 y) |
| { |
| // Get the mode |
| struct vgamode_s *vmode_g = get_current_mode(); |
| if (!vmode_g) |
| return 0; |
| |
| u8 *addr_far, mask, attr=0, data, i; |
| switch (GET_GLOBAL(vmode_g->memmodel)) { |
| case MM_PLANAR: |
| addr_far = (void*)(x / 8 + y * GET_BDA(video_cols)); |
| mask = 0x80 >> (x & 0x07); |
| attr = 0x00; |
| for (i = 0; i < 4; i++) { |
| stdvga_planar4_plane(i); |
| data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask; |
| if (data > 0) |
| attr |= (0x01 << i); |
| } |
| stdvga_planar4_plane(-1); |
| break; |
| case MM_CGA: |
| addr_far = (void*)((x >> 2) + (y >> 1) * 80); |
| if (y & 1) |
| addr_far += 0x2000; |
| data = GET_FARVAR(SEG_CTEXT, *addr_far); |
| if (GET_GLOBAL(vmode_g->depth) == 2) |
| attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03; |
| else |
| attr = (data >> (7 - (x & 0x07))) & 0x01; |
| break; |
| case MM_DIRECT: |
| case MM_PACKED: |
| addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8)); |
| attr = GET_FARVAR(SEG_GRAPH, *addr_far); |
| break; |
| case MM_TEXT: |
| return 0; |
| } |
| return attr; |
| } |