diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/lib/sys/vesa/initvesa.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/lib/sys/vesa/initvesa.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/vesa/initvesa.c b/contrib/syslinux-4.02/com32/lib/sys/vesa/initvesa.c new file mode 100644 index 0000000..9a1ae38 --- /dev/null +++ b/contrib/syslinux-4.02/com32/lib/sys/vesa/initvesa.c @@ -0,0 +1,357 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 1999-2008 H. Peter Anvin - All Rights Reserved + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall + * be included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ----------------------------------------------------------------------- */ + +/* + * initvesa.c + * + * Query the VESA BIOS and select a 640x480x32 mode with local mapping + * support, if one exists. + */ + +#include <inttypes.h> +#include <com32.h> +#include <stdlib.h> +#include <string.h> +#include <sys/fpu.h> +#include <syslinux/video.h> +#include "vesa.h" +#include "video.h" +#include "fill.h" +#include "debug.h" + +struct vesa_info __vesa_info; + +struct vesa_char *__vesacon_text_display; + +int __vesacon_font_height; +int __vesacon_text_rows; +int __vesacon_text_cols; +enum vesa_pixel_format __vesacon_pixel_format = PXF_NONE; +unsigned int __vesacon_bytes_per_pixel; +uint8_t __vesacon_graphics_font[FONT_MAX_CHARS][FONT_MAX_HEIGHT]; + +uint32_t *__vesacon_background, *__vesacon_shadowfb; + +static void unpack_font(uint8_t * dst, uint8_t * src, int height) +{ + int i; + + for (i = 0; i < FONT_MAX_CHARS; i++) { + memcpy(dst, src, height); + memset(dst + height, 0, FONT_MAX_HEIGHT - height); + + dst += FONT_MAX_HEIGHT; + src += height; + } +} + +static int __constfunc is_power_of_2(unsigned int x) +{ + return x && !(x & (x - 1)); +} + +static int vesacon_paged_mode_ok(const struct vesa_mode_info *mi) +{ + int i; + + if (!is_power_of_2(mi->win_size) || + !is_power_of_2(mi->win_grain) || mi->win_grain > mi->win_size) + return 0; /* Impossible... */ + + for (i = 0; i < 2; i++) { + if ((mi->win_attr[i] & 0x05) == 0x05 && mi->win_seg[i]) + return 1; /* Usable window */ + } + + return 0; /* Nope... */ +} + +static int vesacon_set_mode(int x, int y) +{ + com32sys_t rm; + uint8_t *rom_font; + uint16_t mode, bestmode, *mode_ptr; + struct vesa_info *vi; + struct vesa_general_info *gi; + struct vesa_mode_info *mi; + enum vesa_pixel_format pxf, bestpxf; + int err = 0; + + debug("Hello, World!\r\n"); + + /* Free any existing data structures */ + if (__vesacon_background) { + free(__vesacon_background); + __vesacon_background = NULL; + } + if (__vesacon_shadowfb) { + free(__vesacon_shadowfb); + __vesacon_shadowfb = NULL; + } + + /* Allocate space in the bounce buffer for these structures */ + vi = lzalloc(sizeof *vi); + if (!vi) { + err = 10; /* Out of memory */ + goto exit; + } + gi = &vi->gi; + mi = &vi->mi; + + memset(&rm, 0, sizeof rm); + + gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */ + rm.eax.w[0] = 0x4F00; /* Get SVGA general information */ + rm.edi.w[0] = OFFS(gi); + rm.es = SEG(gi); + __intcall(0x10, &rm, &rm); + + if (rm.eax.w[0] != 0x004F) { + err = 1; /* Function call failed */ + goto exit; + } + if (gi->signature != VESA_MAGIC) { + err = 2; /* No magic */ + goto exit; + } + if (gi->version < 0x0102) { + err = 3; /* VESA 1.2+ required */ + goto exit; + } + + /* Copy general info */ + memcpy(&__vesa_info.gi, gi, sizeof *gi); + + /* Search for the proper mode with a suitable color and memory model... */ + + mode_ptr = GET_PTR(gi->video_mode_ptr); + bestmode = 0; + bestpxf = PXF_NONE; + + while ((mode = *mode_ptr++) != 0xFFFF) { + mode &= 0x1FF; /* The rest are attributes of sorts */ + + debug("Found mode: 0x%04x\r\n", mode); + + memset(mi, 0, sizeof *mi); + rm.eax.w[0] = 0x4F01; /* Get SVGA mode information */ + rm.ecx.w[0] = mode; + rm.edi.w[0] = OFFS(mi); + rm.es = SEG(mi); + __intcall(0x10, &rm, &rm); + + /* Must be a supported mode */ + if (rm.eax.w[0] != 0x004f) + continue; + + debug + ("mode_attr 0x%04x, h_res = %4d, v_res = %4d, bpp = %2d, layout = %d (%d,%d,%d)\r\n", + mi->mode_attr, mi->h_res, mi->v_res, mi->bpp, mi->memory_layout, + mi->rpos, mi->gpos, mi->bpos); + + /* Must be an LFB color graphics mode supported by the hardware. + + The bits tested are: + 4 - graphics mode + 3 - color mode + 1 - mode information available (mandatory in VBE 1.2+) + 0 - mode supported by hardware + */ + if ((mi->mode_attr & 0x001b) != 0x001b) + continue; + + /* Must be the chosen size */ + if (mi->h_res != x || mi->v_res != y) + continue; + + /* We don't support multibank (interlaced memory) modes */ + /* + * Note: The Bochs VESA BIOS (vbe.c 1.58 2006/08/19) violates the + * specification which states that banks == 1 for unbanked modes; + * fortunately it does report bank_size == 0 for those. + */ + if (mi->banks > 1 && mi->bank_size) { + debug("bad: banks = %d, banksize = %d, pages = %d\r\n", + mi->banks, mi->bank_size, mi->image_pages); + continue; + } + + /* Must be either a flat-framebuffer mode, or be an acceptable + paged mode */ + if (!(mi->mode_attr & 0x0080) && !vesacon_paged_mode_ok(mi)) { + debug("bad: invalid paged mode\r\n"); + continue; + } + + /* Must either be a packed-pixel mode or a direct color mode + (depending on VESA version ); must be a supported pixel format */ + pxf = PXF_NONE; /* Not usable */ + + if (mi->bpp == 32 && + (mi->memory_layout == 4 || + (mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 && + mi->bpos == 0))) + pxf = PXF_BGRA32; + else if (mi->bpp == 24 && + (mi->memory_layout == 4 || + (mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 && + mi->bpos == 0))) + pxf = PXF_BGR24; + else if (mi->bpp == 16 && + (mi->memory_layout == 4 || + (mi->memory_layout == 6 && mi->rpos == 11 && mi->gpos == 5 && + mi->bpos == 0))) + pxf = PXF_LE_RGB16_565; + else if (mi->bpp == 15 && + (mi->memory_layout == 4 || + (mi->memory_layout == 6 && mi->rpos == 10 && mi->gpos == 5 && + mi->bpos == 0))) + pxf = PXF_LE_RGB15_555; + + if (pxf < bestpxf) { + debug("Best mode so far, pxf = %d\r\n", pxf); + + /* Best mode so far... */ + bestmode = mode; + bestpxf = pxf; + + /* Copy mode info */ + memcpy(&__vesa_info.mi, mi, sizeof *mi); + } + } + + if (bestpxf == PXF_NONE) { + err = 4; /* No mode found */ + goto exit; + } + + mi = &__vesa_info.mi; + mode = bestmode; + __vesacon_bytes_per_pixel = (mi->bpp + 7) >> 3; + __vesacon_format_pixels = __vesacon_format_pixels_list[bestpxf]; + + /* Download the SYSLINUX- or BIOS-provided font */ + __vesacon_font_height = syslinux_font_query(&rom_font); + if (!__vesacon_font_height) { + /* Get BIOS 8x16 font */ + + rm.eax.w[0] = 0x1130; /* Get Font Information */ + rm.ebx.w[0] = 0x0600; /* Get 8x16 ROM font */ + __intcall(0x10, &rm, &rm); + rom_font = MK_PTR(rm.es, rm.ebp.w[0]); + __vesacon_font_height = 16; + } + unpack_font((uint8_t *) __vesacon_graphics_font, rom_font, + __vesacon_font_height); + + /* Now set video mode */ + rm.eax.w[0] = 0x4F02; /* Set SVGA video mode */ + if (mi->mode_attr & 0x0080) + mode |= 0x4000; /* Request linear framebuffer if supported */ + rm.ebx.w[0] = mode; + __intcall(0x10, &rm, &rm); + if (rm.eax.w[0] != 0x004F) { + err = 9; /* Failed to set mode */ + goto exit; + } + + __vesacon_background = calloc(mi->h_res*mi->v_res, 4); + __vesacon_shadowfb = calloc(mi->h_res*mi->v_res, 4); + + __vesacon_init_copy_to_screen(); + + /* Tell syslinux we changed video mode */ + /* In theory this should be: + + flags = (mi->mode_attr & 4) ? 0x0007 : 0x000f; + + However, that would assume all systems that claim to handle text + output in VESA modes actually do that... */ + syslinux_report_video_mode(0x000f, mi->h_res, mi->v_res); + + __vesacon_pixel_format = bestpxf; + +exit: + if (vi) + lfree(vi); + + return err; +} + +static int init_text_display(void) +{ + size_t nchars; + struct vesa_char *ptr; + struct vesa_char def_char = { + .ch = ' ', + .attr = 0, + }; + + if (__vesacon_text_display) + free(__vesacon_text_display); + + __vesacon_text_cols = TEXT_PIXEL_COLS / FONT_WIDTH; + __vesacon_text_rows = TEXT_PIXEL_ROWS / __vesacon_font_height; + nchars = (__vesacon_text_cols+2) * (__vesacon_text_rows+2); + + __vesacon_text_display = ptr = malloc(nchars * sizeof(struct vesa_char)); + + if (!ptr) + return -1; + + vesacon_fill(ptr, def_char, nchars); + __vesacon_init_cursor(__vesacon_font_height); + + return 0; +} + +int __vesacon_init(int x, int y) +{ + int rv; + + /* We need the FPU for graphics, at least libpng et al will need it... */ + if (x86_init_fpu()) + return 10; + + rv = vesacon_set_mode(x, y); + if (rv) { + /* Try to see if we can just patch the BIOS... */ + if (__vesacon_i915resolution(x, y)) + return rv; + if (vesacon_set_mode(x, y)) + return rv; + } + + init_text_display(); + + debug("Mode set, now drawing at %#p\r\n", __vesa_info.mi.lfb_ptr); + + __vesacon_init_background(); + + debug("Ready!\r\n"); + return 0; +} |