--- /dev/null
+// VGA bios implementation
+//
+// 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.
+
+
+// TODO:
+// * review correctness of converted asm by comparing with RBIL
+//
+// * convert vbe/clext code
+
+#include "bregs.h" // struct bregs
+#include "biosvar.h" // GET_BDA
+#include "util.h" // memset
+#include "vgatables.h" // find_vga_entry
+
+// XXX
+#define CONFIG_VBE 0
+#define CONFIG_CIRRUS 0
+
+// XXX
+#define DEBUG_VGA_POST 1
+#define DEBUG_VGA_10 3
+
+#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
+
+
+/****************************************************************
+ * Helper functions
+ ****************************************************************/
+
+static inline void
+call16_vgaint(u32 eax, u32 ebx)
+{
+ asm volatile(
+ "int $0x10\n"
+ "cli\n"
+ "cld"
+ :
+ : "a"(eax), "b"(ebx)
+ : "cc", "memory");
+}
+
+static void
+perform_gray_scale_summing(u16 start, u16 count)
+{
+ vgahw_screen_disable();
+ int i;
+ for (i = start; i < start+count; i++) {
+ u8 rgb[3];
+ vgahw_get_dac_regs(GET_SEG(SS), rgb, i, 1);
+
+ // intensity = ( 0.3 * Red ) + ( 0.59 * Green ) + ( 0.11 * Blue )
+ u16 intensity = ((77 * rgb[0] + 151 * rgb[1] + 28 * rgb[2]) + 0x80) >> 8;
+ if (intensity > 0x3f)
+ intensity = 0x3f;
+
+ vgahw_set_dac_regs(GET_SEG(SS), rgb, i, 1);
+ }
+ vgahw_screen_enable();
+}
+
+static void
+set_cursor_shape(u8 start, u8 end)
+{
+ start &= 0x3f;
+ end &= 0x1f;
+
+ u16 curs = (start << 8) + end;
+ SET_BDA(cursor_type, curs);
+
+ u8 modeset_ctl = GET_BDA(modeset_ctl);
+ u16 cheight = GET_BDA(char_height);
+ if ((modeset_ctl & 0x01) && (cheight > 8) && (end < 8) && (start < 0x20)) {
+ if (end != (start + 1))
+ start = ((start + 1) * cheight / 8) - 1;
+ else
+ start = ((end + 1) * cheight / 8) - 2;
+ end = ((end + 1) * cheight / 8) - 1;
+ }
+ vgahw_set_cursor_shape(start, end);
+}
+
+static u16
+get_cursor_shape(u8 page)
+{
+ if (page > 7)
+ return 0;
+ // FIXME should handle VGA 14/16 lines
+ return GET_BDA(cursor_type);
+}
+
+static void
+set_cursor_pos(struct cursorpos cp)
+{
+ // Should not happen...
+ if (cp.page > 7)
+ return;
+
+ // Bios cursor pos
+ SET_BDA(cursor_pos[cp.page], (cp.y << 8) | cp.x);
+
+ // Set the hardware cursor
+ u8 current = GET_BDA(video_page);
+ if (cp.page != current)
+ return;
+
+ // Get the dimensions
+ u16 nbcols = GET_BDA(video_cols);
+ u16 nbrows = GET_BDA(video_rows) + 1;
+
+ // Calculate the address knowing nbcols nbrows and page num
+ u16 address = (SCREEN_IO_START(nbcols, nbrows, cp.page)
+ + cp.x + cp.y * nbcols);
+
+ vgahw_set_cursor_pos(address);
+}
+
+static struct cursorpos
+get_cursor_pos(u8 page)
+{
+ if (page == 0xff)
+ // special case - use current page
+ page = GET_BDA(video_page);
+ if (page > 7) {
+ struct cursorpos cp = { 0, 0, 0xfe };
+ return cp;
+ }
+ // FIXME should handle VGA 14/16 lines
+ u16 xy = GET_BDA(cursor_pos[page]);
+ struct cursorpos cp = {xy, xy>>8, page};
+ return cp;
+}
+
+static void
+set_active_page(u8 page)
+{
+ if (page > 7)
+ return;
+
+ // Get the mode
+ struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
+ if (!vmode_g)
+ return;
+
+ // Get pos curs pos for the right page
+ struct cursorpos cp = get_cursor_pos(page);
+
+ u16 address;
+ if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
+ // Get the dimensions
+ u16 nbcols = GET_BDA(video_cols);
+ u16 nbrows = GET_BDA(video_rows) + 1;
+
+ // Calculate the address knowing nbcols nbrows and page num
+ address = SCREEN_MEM_START(nbcols, nbrows, page);
+ SET_BDA(video_pagestart, address);
+
+ // Start address
+ address = SCREEN_IO_START(nbcols, nbrows, page);
+ } else {
+ struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
+ address = page * GET_GLOBAL(vparam_g->slength);
+ }
+
+ vgahw_set_active_page(address);
+
+ // And change the BIOS page
+ SET_BDA(video_page, page);
+
+ dprintf(1, "Set active page %02x address %04x\n", page, address);
+
+ // Display the cursor, now the page is active
+ set_cursor_pos(cp);
+}
+
+static void
+set_scan_lines(u8 lines)
+{
+ vgahw_set_scan_lines(lines);
+ if (lines == 8)
+ set_cursor_shape(0x06, 0x07);
+ else
+ set_cursor_shape(lines - 4, lines - 3);
+ SET_BDA(char_height, lines);
+ u16 vde = vgahw_get_vde();
+ u8 rows = vde / lines;
+ SET_BDA(video_rows, rows - 1);
+ u16 cols = GET_BDA(video_cols);
+ SET_BDA(video_pagesize, rows * cols * 2);
+}
+
+
+/****************************************************************
+ * Character writing
+ ****************************************************************/
+
+// Scroll the screen one line. This function is designed to be called
+// tail-recursive to reduce stack usage.
+static void noinline
+scroll_one(u16 nbrows, u16 nbcols, u8 page)
+{
+ struct cursorpos ul = {0, 0, page};
+ struct cursorpos lr = {nbcols-1, nbrows-1, page};
+ vgafb_scroll(1, -1, ul, lr);
+}
+
+// Write a character to the screen at a given position. Implement
+// special characters and scroll the screen if necessary.
+static void
+write_teletype(struct cursorpos *pcp, struct carattr ca)
+{
+ struct cursorpos cp = *pcp;
+
+ // Get the dimensions
+ u16 nbrows = GET_BDA(video_rows) + 1;
+ u16 nbcols = GET_BDA(video_cols);
+
+ switch (ca.car) {
+ case 7:
+ //FIXME should beep
+ break;
+ case 8:
+ if (cp.x > 0)
+ cp.x--;
+ break;
+ case '\r':
+ cp.x = 0;
+ break;
+ case '\n':
+ cp.y++;
+ break;
+ case '\t':
+ do {
+ struct carattr dummyca = {' ', ca.attr, ca.use_attr};
+ vgafb_write_char(cp, dummyca);
+ cp.x++;
+ } while (cp.x < nbcols && cp.x % 8);
+ break;
+ default:
+ vgafb_write_char(cp, ca);
+ cp.x++;
+ }
+
+ // Do we need to wrap ?
+ if (cp.x == nbcols) {
+ cp.x = 0;
+ cp.y++;
+ }
+ // Do we need to scroll ?
+ if (cp.y < nbrows) {
+ *pcp = cp;
+ return;
+ }
+ // Scroll screen
+ cp.y--;
+ *pcp = cp;
+ scroll_one(nbrows, nbcols, cp.page);
+}
+
+// Write out a buffer of alternating characters and attributes.
+static void
+write_attr_string(struct cursorpos *pcp, u16 count, u16 seg, u8 *offset_far)
+{
+ while (count--) {
+ u8 car = GET_FARVAR(seg, *offset_far);
+ offset_far++;
+ u8 attr = GET_FARVAR(seg, *offset_far);
+ offset_far++;
+
+ struct carattr ca = {car, attr, 1};
+ write_teletype(pcp, ca);
+ }
+}
+
+// Write out a buffer of characters.
+static void
+write_string(struct cursorpos *pcp, u8 attr, u16 count, u16 seg, u8 *offset_far)
+{
+ while (count--) {
+ u8 car = GET_FARVAR(seg, *offset_far);
+ offset_far++;
+
+ struct carattr ca = {car, attr, 1};
+ write_teletype(pcp, ca);
+ }
+}
+
+
+/****************************************************************
+ * Save and restore bda state
+ ****************************************************************/
+
+static void
+save_bda_state(u16 seg, struct saveBDAstate *info)
+{
+ SET_FARVAR(seg, info->video_mode, GET_BDA(video_mode));
+ SET_FARVAR(seg, info->video_cols, GET_BDA(video_cols));
+ SET_FARVAR(seg, info->video_pagesize, GET_BDA(video_pagesize));
+ SET_FARVAR(seg, info->crtc_address, GET_BDA(crtc_address));
+ SET_FARVAR(seg, info->video_rows, GET_BDA(video_rows));
+ SET_FARVAR(seg, info->char_height, GET_BDA(char_height));
+ SET_FARVAR(seg, info->video_ctl, GET_BDA(video_ctl));
+ SET_FARVAR(seg, info->video_switches, GET_BDA(video_switches));
+ SET_FARVAR(seg, info->modeset_ctl, GET_BDA(modeset_ctl));
+ SET_FARVAR(seg, info->cursor_type, GET_BDA(cursor_type));
+ u16 i;
+ for (i=0; i<8; i++)
+ SET_FARVAR(seg, info->cursor_pos[i], GET_BDA(cursor_pos[i]));
+ SET_FARVAR(seg, info->video_pagestart, GET_BDA(video_pagestart));
+ SET_FARVAR(seg, info->video_page, GET_BDA(video_page));
+ /* current font */
+ SET_FARVAR(seg, info->font0, GET_IVT(0x1f));
+ SET_FARVAR(seg, info->font1, GET_IVT(0x43));
+}
+
+static void
+restore_bda_state(u16 seg, struct saveBDAstate *info)
+{
+ SET_BDA(video_mode, GET_FARVAR(seg, info->video_mode));
+ SET_BDA(video_cols, GET_FARVAR(seg, info->video_cols));
+ SET_BDA(video_pagesize, GET_FARVAR(seg, info->video_pagesize));
+ SET_BDA(crtc_address, GET_FARVAR(seg, info->crtc_address));
+ SET_BDA(video_rows, GET_FARVAR(seg, info->video_rows));
+ SET_BDA(char_height, GET_FARVAR(seg, info->char_height));
+ SET_BDA(video_ctl, GET_FARVAR(seg, info->video_ctl));
+ SET_BDA(video_switches, GET_FARVAR(seg, info->video_switches));
+ SET_BDA(modeset_ctl, GET_FARVAR(seg, info->modeset_ctl));
+ SET_BDA(cursor_type, GET_FARVAR(seg, info->cursor_type));
+ u16 i;
+ for (i = 0; i < 8; i++)
+ SET_BDA(cursor_pos[i], GET_FARVAR(seg, info->cursor_pos[i]));
+ SET_BDA(video_pagestart, GET_FARVAR(seg, info->video_pagestart));
+ SET_BDA(video_page, GET_FARVAR(seg, info->video_page));
+ /* current font */
+ SET_IVT(0x1f, GET_FARVAR(seg, info->font0));
+ SET_IVT(0x43, GET_FARVAR(seg, info->font1));
+}
+
+
+/****************************************************************
+ * VGA int 10 handler
+ ****************************************************************/
+
+// set video mode
+static void
+handle_1000(struct bregs *regs)
+{
+ u8 noclearmem = regs->al & 0x80;
+ u8 mode = regs->al & 0x7f;
+
+ // Set regs->al
+ if (mode > 7)
+ regs->al = 0x20;
+ else if (mode == 6)
+ regs->al = 0x3f;
+ else
+ regs->al = 0x30;
+
+ if (CONFIG_CIRRUS)
+ cirrus_set_video_mode(mode);
+
+ if (CONFIG_VBE)
+ if (vbe_has_vbe_display())
+ dispi_set_enable(VBE_DISPI_DISABLED);
+
+ // find the entry in the video modes
+ struct vgamode_s *vmode_g = find_vga_entry(mode);
+ dprintf(1, "mode search %02x found %p\n", mode, vmode_g);
+ if (!vmode_g)
+ return;
+
+ // Read the bios mode set control
+ u8 modeset_ctl = GET_BDA(modeset_ctl);
+
+ // Then we know the number of lines
+// FIXME
+
+ // if palette loading (bit 3 of modeset ctl = 0)
+ if ((modeset_ctl & 0x08) == 0) { // Set the PEL mask
+ vgahw_set_pel_mask(GET_GLOBAL(vmode_g->pelmask));
+
+ // From which palette
+ u8 *palette_g = GET_GLOBAL(vmode_g->dac);
+ u16 palsize = GET_GLOBAL(vmode_g->dacsize) / 3;
+
+ // Always 256*3 values
+ vgahw_set_dac_regs(get_global_seg(), palette_g, 0, palsize);
+ u16 i;
+ for (i = palsize; i < 0x0100; i++) {
+ static u8 rgb[3] VAR16;
+ vgahw_set_dac_regs(get_global_seg(), rgb, i, 1);
+ }
+
+ if ((modeset_ctl & 0x02) == 0x02)
+ perform_gray_scale_summing(0x00, 0x100);
+ }
+
+ struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
+ vgahw_set_mode(vparam_g);
+
+ if (noclearmem == 0x00)
+ clear_screen(vmode_g);
+
+ // Set CRTC address VGA or MDA
+ u16 crtc_addr = VGAREG_VGA_CRTC_ADDRESS;
+ if (GET_GLOBAL(vmode_g->memmodel) == MTEXT)
+ crtc_addr = VGAREG_MDA_CRTC_ADDRESS;
+
+ // Set the BIOS mem
+ u16 cheight = GET_GLOBAL(vparam_g->cheight);
+ SET_BDA(video_mode, mode);
+ SET_BDA(video_cols, GET_GLOBAL(vparam_g->twidth));
+ SET_BDA(video_pagesize, GET_GLOBAL(vparam_g->slength));
+ SET_BDA(crtc_address, crtc_addr);
+ SET_BDA(video_rows, GET_GLOBAL(vparam_g->theightm1));
+ SET_BDA(char_height, cheight);
+ SET_BDA(video_ctl, (0x60 | noclearmem));
+ SET_BDA(video_switches, 0xF9);
+ SET_BDA(modeset_ctl, GET_BDA(modeset_ctl) & 0x7f);
+
+ // FIXME We nearly have the good tables. to be reworked
+ SET_BDA(dcc_index, 0x08); // 8 is VGA should be ok for now
+ SET_BDA(video_savetable
+ , SEGOFF(get_global_seg(), (u32)video_save_pointer_table));
+
+ // FIXME
+ SET_BDA(video_msr, 0x00); // Unavailable on vanilla vga, but...
+ SET_BDA(video_pal, 0x00); // Unavailable on vanilla vga, but...
+
+ // Set cursor shape
+ if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
+ set_cursor_shape(0x06, 0x07);
+ // Set cursor pos for page 0..7
+ int i;
+ for (i = 0; i < 8; i++) {
+ struct cursorpos cp = {0, 0, i};
+ set_cursor_pos(cp);
+ }
+
+ // Set active page 0
+ set_active_page(0x00);
+
+ // Write the fonts in memory
+ if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
+ call16_vgaint(0x1104, 0);
+ call16_vgaint(0x1103, 0);
+ }
+ // Set the ints 0x1F and 0x43
+ SET_IVT(0x1f, SEGOFF(get_global_seg(), (u32)&vgafont8[128 * 8]));
+
+ switch (cheight) {
+ case 8:
+ SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont8));
+ break;
+ case 14:
+ SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont14));
+ break;
+ case 16:
+ SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont16));
+ break;
+ }
+}
+
+static void
+handle_1001(struct bregs *regs)
+{
+ set_cursor_shape(regs->ch, regs->cl);
+}
+
+static void
+handle_1002(struct bregs *regs)
+{
+ struct cursorpos cp = {regs->dl, regs->dh, regs->bh};
+ set_cursor_pos(cp);
+}
+
+static void
+handle_1003(struct bregs *regs)
+{
+ regs->cx = get_cursor_shape(regs->bh);
+ struct cursorpos cp = get_cursor_pos(regs->bh);
+ regs->dl = cp.x;
+ regs->dh = cp.y;
+}
+
+// Read light pen pos (unimplemented)
+static void
+handle_1004(struct bregs *regs)
+{
+ debug_stub(regs);
+ regs->ax = regs->bx = regs->cx = regs->dx = 0;
+}
+
+static void
+handle_1005(struct bregs *regs)
+{
+ set_active_page(regs->al);
+}
+
+static void
+verify_scroll(struct bregs *regs, int dir)
+{
+ u8 page = GET_BDA(video_page);
+ struct cursorpos ul = {regs->cl, regs->ch, page};
+ struct cursorpos lr = {regs->dl, regs->dh, page};
+
+ u16 nbrows = GET_BDA(video_rows) + 1;
+ if (lr.y >= nbrows)
+ lr.y = nbrows - 1;
+ u16 nbcols = GET_BDA(video_cols);
+ if (lr.x >= nbcols)
+ lr.x = nbcols - 1;
+
+ if (ul.x > lr.x || ul.y > lr.y)
+ return;
+
+ u16 nblines = regs->al;
+ if (!nblines || nblines > lr.y - ul.y + 1)
+ nblines = lr.y - ul.y + 1;
+
+ vgafb_scroll(dir * nblines, regs->bh, ul, lr);
+}
+
+static void
+handle_1006(struct bregs *regs)
+{
+ verify_scroll(regs, 1);
+}
+
+static void
+handle_1007(struct bregs *regs)
+{
+ verify_scroll(regs, -1);
+}
+
+static void
+handle_1008(struct bregs *regs)
+{
+ struct carattr ca = vgafb_read_char(get_cursor_pos(regs->bh));
+ regs->al = ca.car;
+ regs->ah = ca.attr;
+}
+
+static void noinline
+write_chars(u8 page, struct carattr ca, u16 count)
+{
+ struct cursorpos cp = get_cursor_pos(page);
+ while (count--) {
+ vgafb_write_char(cp, ca);
+ cp.x++;
+ }
+}
+
+static void
+handle_1009(struct bregs *regs)
+{
+ struct carattr ca = {regs->al, regs->bl, 1};
+ write_chars(regs->bh, ca, regs->cx);
+}
+
+static void
+handle_100a(struct bregs *regs)
+{
+ struct carattr ca = {regs->al, regs->bl, 0};
+ write_chars(regs->bh, ca, regs->cx);
+}
+
+
+static void
+handle_100b00(struct bregs *regs)
+{
+ vgahw_set_border_color(regs->bl);
+}
+
+static void
+handle_100b01(struct bregs *regs)
+{
+ vgahw_set_palette(regs->bl);
+}
+
+static void
+handle_100bXX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_100b(struct bregs *regs)
+{
+ switch (regs->bh) {
+ case 0x00: handle_100b00(regs); break;
+ case 0x01: handle_100b01(regs); break;
+ default: handle_100bXX(regs); break;
+ }
+}
+
+
+static void
+handle_100c(struct bregs *regs)
+{
+ // XXX - page (regs->bh) is unused
+ vgafb_write_pixel(regs->al, regs->cx, regs->dx);
+}
+
+static void
+handle_100d(struct bregs *regs)
+{
+ // XXX - page (regs->bh) is unused
+ regs->al = vgafb_read_pixel(regs->cx, regs->dx);
+}
+
+static void noinline
+handle_100e(struct bregs *regs)
+{
+ // Ralf Brown Interrupt list is WRONG on bh(page)
+ // We do output only on the current page !
+ struct carattr ca = {regs->al, regs->bl, 0};
+ struct cursorpos cp = get_cursor_pos(0xff);
+ write_teletype(&cp, ca);
+ set_cursor_pos(cp);
+}
+
+static void
+handle_100f(struct bregs *regs)
+{
+ regs->bh = GET_BDA(video_page);
+ regs->al = GET_BDA(video_mode) | (GET_BDA(video_ctl) & 0x80);
+ regs->ah = GET_BDA(video_cols);
+}
+
+
+static void
+handle_101000(struct bregs *regs)
+{
+ if (regs->bl > 0x14)
+ return;
+ vgahw_set_single_palette_reg(regs->bl, regs->bh);
+}
+
+static void
+handle_101001(struct bregs *regs)
+{
+ vgahw_set_overscan_border_color(regs->bh);
+}
+
+static void
+handle_101002(struct bregs *regs)
+{
+ vgahw_set_all_palette_reg(regs->es, (u8*)(regs->dx + 0));
+}
+
+static void
+handle_101003(struct bregs *regs)
+{
+ vgahw_toggle_intensity(regs->bl);
+}
+
+static void
+handle_101007(struct bregs *regs)
+{
+ if (regs->bl > 0x14)
+ return;
+ regs->bh = vgahw_get_single_palette_reg(regs->bl);
+}
+
+static void
+handle_101008(struct bregs *regs)
+{
+ regs->bh = vgahw_get_overscan_border_color();
+}
+
+static void
+handle_101009(struct bregs *regs)
+{
+ vgahw_get_all_palette_reg(regs->es, (u8*)(regs->dx + 0));
+}
+
+static void noinline
+handle_101010(struct bregs *regs)
+{
+ u8 rgb[3] = {regs->dh, regs->ch, regs->cl};
+ vgahw_set_dac_regs(GET_SEG(SS), rgb, regs->bx, 1);
+}
+
+static void
+handle_101012(struct bregs *regs)
+{
+ vgahw_set_dac_regs(regs->es, (u8*)(regs->dx + 0), regs->bx, regs->cx);
+}
+
+static void
+handle_101013(struct bregs *regs)
+{
+ vgahw_select_video_dac_color_page(regs->bl, regs->bh);
+}
+
+static void noinline
+handle_101015(struct bregs *regs)
+{
+ u8 rgb[3];
+ vgahw_get_dac_regs(GET_SEG(SS), rgb, regs->bx, 1);
+ regs->dh = rgb[0];
+ regs->ch = rgb[1];
+ regs->cl = rgb[2];
+}
+
+static void
+handle_101017(struct bregs *regs)
+{
+ vgahw_get_dac_regs(regs->es, (u8*)(regs->dx + 0), regs->bx, regs->cx);
+}
+
+static void
+handle_101018(struct bregs *regs)
+{
+ vgahw_set_pel_mask(regs->bl);
+}
+
+static void
+handle_101019(struct bregs *regs)
+{
+ regs->bl = vgahw_get_pel_mask();
+}
+
+static void
+handle_10101a(struct bregs *regs)
+{
+ vgahw_read_video_dac_state(®s->bl, ®s->bh);
+}
+
+static void
+handle_10101b(struct bregs *regs)
+{
+ perform_gray_scale_summing(regs->bx, regs->cx);
+}
+
+static void
+handle_1010XX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_1010(struct bregs *regs)
+{
+ switch (regs->al) {
+ case 0x00: handle_101000(regs); break;
+ case 0x01: handle_101001(regs); break;
+ case 0x02: handle_101002(regs); break;
+ case 0x03: handle_101003(regs); break;
+ case 0x07: handle_101007(regs); break;
+ case 0x08: handle_101008(regs); break;
+ case 0x09: handle_101009(regs); break;
+ case 0x10: handle_101010(regs); break;
+ case 0x12: handle_101012(regs); break;
+ case 0x13: handle_101013(regs); break;
+ case 0x15: handle_101015(regs); break;
+ case 0x17: handle_101017(regs); break;
+ case 0x18: handle_101018(regs); break;
+ case 0x19: handle_101019(regs); break;
+ case 0x1a: handle_10101a(regs); break;
+ case 0x1b: handle_10101b(regs); break;
+ default: handle_1010XX(regs); break;
+ }
+}
+
+
+static void
+handle_101100(struct bregs *regs)
+{
+ vgafb_load_font(regs->es, (void*)(regs->bp+0), regs->cx
+ , regs->dx, regs->bl, regs->bh);
+}
+
+static void
+handle_101101(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont14, 0x100, 0, regs->bl, 14);
+}
+
+static void
+handle_101102(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont8, 0x100, 0, regs->bl, 8);
+}
+
+static void
+handle_101103(struct bregs *regs)
+{
+ vgahw_set_text_block_specifier(regs->bl);
+}
+
+static void
+handle_101104(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont16, 0x100, 0, regs->bl, 16);
+}
+
+static void
+handle_101110(struct bregs *regs)
+{
+ vgafb_load_font(regs->es, (void*)(regs->bp+0), regs->cx
+ , regs->dx, regs->bl, regs->bh);
+ set_scan_lines(regs->bh);
+}
+
+static void
+handle_101111(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont14, 0x100, 0, regs->bl, 14);
+ set_scan_lines(14);
+}
+
+static void
+handle_101112(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont8, 0x100, 0, regs->bl, 8);
+ set_scan_lines(8);
+}
+
+static void
+handle_101114(struct bregs *regs)
+{
+ vgafb_load_font(get_global_seg(), vgafont16, 0x100, 0, regs->bl, 16);
+ set_scan_lines(16);
+}
+
+static void
+handle_101130(struct bregs *regs)
+{
+ switch (regs->bh) {
+ case 0x00: {
+ struct segoff_s so = GET_IVT(0x1f);
+ regs->es = so.seg;
+ regs->bp = so.offset;
+ break;
+ }
+ case 0x01: {
+ struct segoff_s so = GET_IVT(0x43);
+ regs->es = so.seg;
+ regs->bp = so.offset;
+ break;
+ }
+ case 0x02:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont14;
+ break;
+ case 0x03:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont8;
+ break;
+ case 0x04:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont8 + 128 * 8;
+ break;
+ case 0x05:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont14alt;
+ break;
+ case 0x06:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont16;
+ break;
+ case 0x07:
+ regs->es = get_global_seg();
+ regs->bp = (u32)vgafont16alt;
+ break;
+ default:
+ dprintf(1, "Get font info BH(%02x) was discarded\n", regs->bh);
+ return;
+ }
+ // Set byte/char of on screen font
+ regs->cx = GET_BDA(char_height) & 0xff;
+
+ // Set Highest char row
+ regs->dx = GET_BDA(video_rows);
+}
+
+static void
+handle_1011XX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_1011(struct bregs *regs)
+{
+ switch (regs->al) {
+ case 0x00: handle_101100(regs); break;
+ case 0x01: handle_101101(regs); break;
+ case 0x02: handle_101102(regs); break;
+ case 0x03: handle_101103(regs); break;
+ case 0x04: handle_101104(regs); break;
+ case 0x10: handle_101110(regs); break;
+ case 0x11: handle_101111(regs); break;
+ case 0x12: handle_101112(regs); break;
+ case 0x14: handle_101114(regs); break;
+ case 0x30: handle_101130(regs); break;
+ default: handle_1011XX(regs); break;
+ }
+}
+
+
+static void
+handle_101210(struct bregs *regs)
+{
+ u16 crtc_addr = GET_BDA(crtc_address);
+ if (crtc_addr == VGAREG_MDA_CRTC_ADDRESS)
+ regs->bx = 0x0103;
+ else
+ regs->bx = 0x0003;
+ regs->cx = GET_BDA(video_switches) & 0x0f;
+}
+
+static void
+handle_101230(struct bregs *regs)
+{
+ u8 mctl = GET_BDA(modeset_ctl);
+ u8 vswt = GET_BDA(video_switches);
+ switch (regs->al) {
+ case 0x00:
+ // 200 lines
+ mctl = (mctl & ~0x10) | 0x80;
+ vswt = (vswt & ~0x0f) | 0x08;
+ break;
+ case 0x01:
+ // 350 lines
+ mctl &= ~0x90;
+ vswt = (vswt & ~0x0f) | 0x09;
+ break;
+ case 0x02:
+ // 400 lines
+ mctl = (mctl & ~0x80) | 0x10;
+ vswt = (vswt & ~0x0f) | 0x09;
+ break;
+ default:
+ dprintf(1, "Select vert res (%02x) was discarded\n", regs->al);
+ break;
+ }
+ SET_BDA(modeset_ctl, mctl);
+ SET_BDA(video_switches, vswt);
+ regs->al = 0x12;
+}
+
+static void
+handle_101231(struct bregs *regs)
+{
+ u8 v = (regs->al & 0x01) << 3;
+ u8 mctl = GET_BDA(video_ctl) & ~0x08;
+ SET_BDA(video_ctl, mctl | v);
+ regs->al = 0x12;
+}
+
+static void
+handle_101232(struct bregs *regs)
+{
+ vgahw_enable_video_addressing(regs->al);
+ regs->al = 0x12;
+}
+
+static void
+handle_101233(struct bregs *regs)
+{
+ u8 v = ((regs->al << 1) & 0x02) ^ 0x02;
+ u8 v2 = GET_BDA(modeset_ctl) & ~0x02;
+ SET_BDA(modeset_ctl, v | v2);
+ regs->al = 0x12;
+}
+
+static void
+handle_101234(struct bregs *regs)
+{
+ u8 v = (regs->al & 0x01) ^ 0x01;
+ u8 v2 = GET_BDA(modeset_ctl) & ~0x01;
+ SET_BDA(modeset_ctl, v | v2);
+ regs->al = 0x12;
+}
+
+static void
+handle_101235(struct bregs *regs)
+{
+ debug_stub(regs);
+ regs->al = 0x12;
+}
+
+static void
+handle_101236(struct bregs *regs)
+{
+ debug_stub(regs);
+ regs->al = 0x12;
+}
+
+static void
+handle_1012XX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_1012(struct bregs *regs)
+{
+ switch (regs->bl) {
+ case 0x10: handle_101210(regs); break;
+ case 0x30: handle_101230(regs); break;
+ case 0x31: handle_101231(regs); break;
+ case 0x32: handle_101232(regs); break;
+ case 0x33: handle_101233(regs); break;
+ case 0x34: handle_101234(regs); break;
+ case 0x35: handle_101235(regs); break;
+ case 0x36: handle_101236(regs); break;
+ default: handle_1012XX(regs); break;
+ }
+
+ // XXX - cirrus has 1280, 1281, 1282, 1285, 129a, 12a0, 12a1, 12a2, 12ae
+}
+
+
+// Write string
+static void noinline
+handle_1013(struct bregs *regs)
+{
+ struct cursorpos cp = {regs->dl, regs->dh, regs->bh};
+ // if row=0xff special case : use current cursor position
+ if (cp.y == 0xff)
+ cp = get_cursor_pos(cp.page);
+ u8 flag = regs->al;
+ if (flag & 2)
+ write_attr_string(&cp, regs->cx, regs->es, (void*)(regs->bp + 0));
+ else
+ write_string(&cp, regs->bl, regs->cx, regs->es, (void*)(regs->bp + 0));
+
+ if (flag & 1)
+ set_cursor_pos(cp);
+}
+
+
+static void
+handle_101a00(struct bregs *regs)
+{
+ regs->bx = GET_BDA(dcc_index);
+ regs->al = 0x1a;
+}
+
+static void
+handle_101a01(struct bregs *regs)
+{
+ SET_BDA(dcc_index, regs->bl);
+ dprintf(1, "Alternate Display code (%02x) was discarded\n", regs->bh);
+ regs->al = 0x1a;
+}
+
+static void
+handle_101aXX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_101a(struct bregs *regs)
+{
+ switch (regs->al) {
+ case 0x00: handle_101a00(regs); break;
+ case 0x01: handle_101a01(regs); break;
+ default: handle_101aXX(regs); break;
+ }
+}
+
+
+struct funcInfo {
+ u16 static_functionality_off;
+ u16 static_functionality_seg;
+ u8 bda_0x49[30];
+ u8 bda_0x84[3];
+ u8 dcc_index;
+ u8 dcc_alt;
+ u16 colors;
+ u8 pages;
+ u8 scan_lines;
+ u8 primary_char;
+ u8 secondar_char;
+ u8 misc;
+ u8 non_vga_mode;
+ u8 reserved_2f[2];
+ u8 video_mem;
+ u8 save_flags;
+ u8 disp_info;
+ u8 reserved_34[12];
+};
+
+static void
+handle_101b(struct bregs *regs)
+{
+ u16 seg = regs->es;
+ struct funcInfo *info = (void*)(regs->di+0);
+ memset_far(seg, info, 0, sizeof(*info));
+ // Address of static functionality table
+ SET_FARVAR(seg, info->static_functionality_off, (u32)static_functionality);
+ SET_FARVAR(seg, info->static_functionality_seg, get_global_seg());
+
+ // Hard coded copy from BIOS area. Should it be cleaner ?
+ memcpy_far(seg, info->bda_0x49, SEG_BDA, (void*)0x49
+ , sizeof(info->bda_0x49));
+ memcpy_far(seg, info->bda_0x84, SEG_BDA, (void*)0x84
+ , sizeof(info->bda_0x84));
+
+ SET_FARVAR(seg, info->dcc_index, GET_BDA(dcc_index));
+ SET_FARVAR(seg, info->colors, 16);
+ SET_FARVAR(seg, info->pages, 8);
+ SET_FARVAR(seg, info->scan_lines, 2);
+ SET_FARVAR(seg, info->video_mem, 3);
+ regs->al = 0x1B;
+}
+
+
+static void
+handle_101c00(struct bregs *regs)
+{
+ u16 flags = regs->cx;
+ u16 size = 0;
+ if (flags & 1)
+ size += sizeof(struct saveVideoHardware);
+ if (flags & 2)
+ size += sizeof(struct saveBDAstate);
+ if (flags & 4)
+ size += sizeof(struct saveDACcolors);
+ regs->bx = size;
+ regs->al = 0x1c;
+}
+
+static void
+handle_101c01(struct bregs *regs)
+{
+ u16 flags = regs->cx;
+ u16 seg = regs->es;
+ void *data = (void*)(regs->bx+0);
+ if (flags & 1) {
+ vgahw_save_state(seg, data);
+ data += sizeof(struct saveVideoHardware);
+ }
+ if (flags & 2) {
+ save_bda_state(seg, data);
+ data += sizeof(struct saveBDAstate);
+ }
+ if (flags & 4)
+ vgahw_save_dac_state(seg, data);
+ regs->al = 0x1c;
+}
+
+static void
+handle_101c02(struct bregs *regs)
+{
+ u16 flags = regs->cx;
+ u16 seg = regs->es;
+ void *data = (void*)(regs->bx+0);
+ if (flags & 1) {
+ vgahw_restore_state(seg, data);
+ data += sizeof(struct saveVideoHardware);
+ }
+ if (flags & 2) {
+ restore_bda_state(seg, data);
+ data += sizeof(struct saveBDAstate);
+ }
+ if (flags & 4)
+ vgahw_restore_dac_state(seg, data);
+ regs->al = 0x1c;
+}
+
+static void
+handle_101cXX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+static void
+handle_101c(struct bregs *regs)
+{
+ switch (regs->al) {
+ case 0x00: handle_101c00(regs); break;
+ case 0x01: handle_101c01(regs); break;
+ case 0x02: handle_101c02(regs); break;
+ default: handle_101cXX(regs); break;
+ }
+}
+
+
+static void
+handle_104f00(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_return_controller_information(&AX,ES,DI);
+ // XXX - OR cirrus_vesa_00h
+}
+
+static void
+handle_104f01(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_return_mode_information(&AX,CX,ES,DI);
+ // XXX - OR cirrus_vesa_01h
+}
+
+static void
+handle_104f02(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_set_mode(&AX,BX,ES,DI);
+ // XXX - OR cirrus_vesa_02h
+}
+
+static void
+handle_104f03(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_return_current_mode
+ // XXX - OR cirrus_vesa_03h
+}
+
+static void
+handle_104f04(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_save_restore_state(&AX, CX, DX, ES, &BX);
+}
+
+static void
+handle_104f05(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_display_window_control
+ // XXX - OR cirrus_vesa_05h
+}
+
+static void
+handle_104f06(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_set_get_logical_scan_line_length
+ // XXX - OR cirrus_vesa_06h
+}
+
+static void
+handle_104f07(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_set_get_display_start
+ // XXX - OR cirrus_vesa_07h
+}
+
+static void
+handle_104f08(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_set_get_dac_palette_format
+}
+
+static void
+handle_104f0a(struct bregs *regs)
+{
+ // XXX - vbe_biosfn_return_protected_mode_interface
+}
+
+static void
+handle_104fXX(struct bregs *regs)
+{
+ debug_stub(regs);
+ regs->ax = 0x0100;
+}
+
+static void
+handle_104f(struct bregs *regs)
+{
+ if (! CONFIG_VBE || !vbe_has_vbe_display()) {
+ handle_104fXX(regs);
+ return;
+ }
+
+ switch (regs->al) {
+ case 0x00: handle_104f00(regs); break;
+ case 0x01: handle_104f01(regs); break;
+ case 0x02: handle_104f02(regs); break;
+ case 0x03: handle_104f03(regs); break;
+ case 0x04: handle_104f04(regs); break;
+ case 0x05: handle_104f05(regs); break;
+ case 0x06: handle_104f06(regs); break;
+ case 0x07: handle_104f07(regs); break;
+ case 0x08: handle_104f08(regs); break;
+ case 0x0a: handle_104f0a(regs); break;
+ default: handle_104fXX(regs); break;
+ }
+}
+
+
+static void
+handle_10XX(struct bregs *regs)
+{
+ debug_stub(regs);
+}
+
+// INT 10h Video Support Service Entry Point
+void VISIBLE16
+handle_10(struct bregs *regs)
+{
+ debug_enter(regs, DEBUG_VGA_10);
+ switch (regs->ah) {
+ case 0x00: handle_1000(regs); break;
+ case 0x01: handle_1001(regs); break;
+ case 0x02: handle_1002(regs); break;
+ case 0x03: handle_1003(regs); break;
+ case 0x04: handle_1004(regs); break;
+ case 0x05: handle_1005(regs); break;
+ case 0x06: handle_1006(regs); break;
+ case 0x07: handle_1007(regs); break;
+ case 0x08: handle_1008(regs); break;
+ case 0x09: handle_1009(regs); break;
+ case 0x0a: handle_100a(regs); break;
+ case 0x0b: handle_100b(regs); break;
+ case 0x0c: handle_100c(regs); break;
+ case 0x0d: handle_100d(regs); break;
+ case 0x0e: handle_100e(regs); break;
+ case 0x0f: handle_100f(regs); break;
+ case 0x10: handle_1010(regs); break;
+ case 0x11: handle_1011(regs); break;
+ case 0x12: handle_1012(regs); break;
+ case 0x13: handle_1013(regs); break;
+ case 0x1a: handle_101a(regs); break;
+ case 0x1b: handle_101b(regs); break;
+ case 0x1c: handle_101c(regs); break;
+ case 0x4f: handle_104f(regs); break;
+ default: handle_10XX(regs); break;
+ }
+}
+
+
+/****************************************************************
+ * VGA post
+ ****************************************************************/
+
+static void
+init_bios_area(void)
+{
+ // init detected hardware BIOS Area
+ // set 80x25 color (not clear from RBIL but usual)
+ u16 eqf = GET_BDA(equipment_list_flags);
+ SET_BDA(equipment_list_flags, (eqf & 0xffcf) | 0x20);
+
+ // Just for the first int10 find its children
+
+ // the default char height
+ SET_BDA(char_height, 0x10);
+
+ // Clear the screen
+ SET_BDA(video_ctl, 0x60);
+
+ // Set the basic screen we have
+ SET_BDA(video_switches, 0xf9);
+
+ // Set the basic modeset options
+ SET_BDA(modeset_ctl, 0x51);
+
+ // Set the default MSR
+ SET_BDA(video_msr, 0x09);
+}
+
+void VISIBLE16
+vga_post(struct bregs *regs)
+{
+ debug_enter(regs, DEBUG_VGA_POST);
+
+ vgahw_init();
+
+ init_bios_area();
+
+ if (CONFIG_VBE)
+ vbe_init();
+
+ extern void entry_10(void);
+ SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10));
+
+ if (CONFIG_CIRRUS)
+ cirrus_init();
+
+ // XXX - clear screen and display info
+
+ // XXX: fill it
+ SET_VGA(video_save_pointer_table[0], (u32)video_param_table);
+ SET_VGA(video_save_pointer_table[1], get_global_seg());
+
+ // Fixup checksum
+ extern u8 _rom_header_size, _rom_header_checksum;
+ SET_VGA(_rom_header_checksum, 0);
+ u8 sum = -checksum_far(get_global_seg(), 0, _rom_header_size * 512);
+ SET_VGA(_rom_header_checksum, sum);
+}
