[patch] Includes 915resolution support directly into grub2-alpha

grub-1.96-915resolution-0.5.2-3.patch (text/plain), 25.19 KB, created by niogic on 2009-01-03 14:20:05 UTC

Changelog:
Oct 10, 2008, Released as 915
Oct 10, 2008, Updated to include support for 945GM thanks to Scot Doyle

diff -Naur grub-1.96.orig/915resolution/915resolution.c grub-1.96/915resolution/915resolution.c
--- grub-1.96.orig/915resolution/915resolution.c	1969-12-31 17:00:00.000000000 -0700
+++ grub-1.96/915resolution/915resolution.c	2008-04-20 22:49:14.000000000 -0600
@@ -0,0 +1,891 @@
+/* 915resolution - Utility to change vbemodes on the intel
+ * integrated video chipset */
+
+/* Copied from 915 resolution created by steve tomjenovic
+ * 915 resolution was in the public domain.
+ * 
+ * All I have done, was make the above program run within 
+ * the grub2 environment.  
+ *
+ * Some of the checks are still commented, as I did not find
+ * easy replacement for memmem.
+ *
+ * Slightly edited by Nathan Coulson ([e-mail])
+ */
+
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2003,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2003  NIIBE Yutaka <[e-mail]>
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/normal.h>
+#include <grub/i386/io.h>
+
+#define NEW(a) ((a *)(grub_malloc(sizeof(a))))
+#define FREE(a) (grub_free(a))
+
+#define VBIOS_START         0xc0000
+#define VBIOS_SIZE          0x10000
+
+#define FALSE 0
+#define TRUE 1
+
+#define MODE_TABLE_OFFSET_845G 617
+
+#define VERSION "0.5.3-grub2-1"
+
+#define ATI_SIGNATURE1 "ATI MOBILITY RADEON"
+#define ATI_SIGNATURE2 "ATI Technologies Inc"
+#define NVIDIA_SIGNATURE "NVIDIA Corp"
+#define INTEL_SIGNATURE "Intel Corp"
+
+typedef unsigned char * address;
+typedef unsigned char byte;
+typedef unsigned short word;
+typedef unsigned char boolean;
+typedef unsigned int cardinal;
+
+typedef enum {
+    CT_UNKWN, CT_830, CT_845G, CT_855GM, CT_865G, CT_915G, CT_915GM, CT_945G, CT_945GM, CT_945GME,
+    CT_946GZ, CT_G965, CT_Q965
+} chipset_type;
+
+char * chipset_type_names[] = {
+    "UNKNOWN", "830",  "845G", "855GM", "865G", "915G", "915GM", "945G", "945GM", "945GME",
+    "946GZ",   "G965", "Q965"
+};
+
+typedef enum {
+    BT_UNKWN, BT_1, BT_2, BT_3
+} bios_type;
+
+char * bios_type_names[] = {"UNKNOWN", "TYPE 1", "TYPE 2", "TYPE 3"};
+
+int freqs[] = { 60, 75, 85 };
+
+typedef struct {
+    byte mode;
+    byte bits_per_pixel;
+    word resolution;
+    byte unknown;
+} __attribute__((packed)) vbios_mode;
+
+typedef struct {
+    byte unknow1[2];
+    byte x1;
+    byte x_total;
+    byte x2;
+    byte y1;
+    byte y_total;
+    byte y2;
+} __attribute__((packed)) vbios_resolution_type1;
+
+typedef struct {
+    unsigned long clock;
+
+    word x1;
+    word htotal;
+    word x2;
+    word hblank;
+    word hsyncstart;
+    word hsyncend;
+    word y1;
+    word vtotal;
+    word y2;
+    word vblank;
+    word vsyncstart;
+    word vsyncend;
+} __attribute__((packed)) vbios_modeline_type2;
+
+typedef struct {
+    byte xchars;
+    byte ychars;
+    byte unknown[4];
+
+    vbios_modeline_type2 modelines[];
+} __attribute__((packed)) vbios_resolution_type2;
+
+typedef struct {
+    unsigned long clock;
+
+    word x1;
+    word htotal;
+    word x2;
+    word hblank;
+    word hsyncstart;
+    word hsyncend;
+
+    word y1;
+    word vtotal;
+    word y2;
+    word vblank;
+    word vsyncstart;
+    word vsyncend;
+
+    word timing_h;
+    word timing_v;
+
+    byte unknown[6];
+} __attribute__((packed)) vbios_modeline_type3;
+
+typedef struct {
+    unsigned char unknown[6];
+
+    vbios_modeline_type3 modelines[];
+} __attribute__((packed)) vbios_resolution_type3;
+
+typedef struct {
+    cardinal chipset_id;
+    chipset_type chipset;
+    bios_type bios;
+    
+    int bios_fd;
+    address bios_ptr;
+
+    vbios_mode * mode_table;
+    cardinal mode_table_size;
+    byte b1, b2;
+
+    boolean unlocked;
+} vbios_map;
+
+
+cardinal get_chipset_id(void) {
+    grub_outl(0x80000000, 0xcf8);
+    return grub_inl(0xcfc);
+}
+
+chipset_type get_chipset(cardinal id) {
+    chipset_type type;
+    
+    switch (id) {
+    case 0x35758086:
+        type = CT_830;
+        break;
+
+    case 0x25608086:
+        type = CT_845G;
+        break;
+        
+    case 0x35808086:
+        type = CT_855GM;
+        break;
+        
+    case 0x25708086:
+        type = CT_865G;
+        break;
+
+    case 0x25808086:
+	type = CT_915G;
+	break;
+
+    case 0x25908086:
+        type = CT_915GM;
+        break;
+
+    case 0x27708086:
+        type = CT_945G;
+        break;
+
+    case 0x27a08086:
+        type = CT_945GM;
+        break;
+
+    case 0x27ac8086:
+        type = CT_945GME;
+        break;
+
+    case 0x29708086:
+        type = CT_946GZ;
+        break;
+
+    case 0x29a08086:
+	type = CT_G965;
+	break;
+
+    case 0x29908086:
+        type = CT_Q965;
+        break;
+
+    default:
+        type = CT_UNKWN;
+        break;
+    }
+
+    return type;
+}
+
+vbios_resolution_type1 * map_type1_resolution(vbios_map * map, word res) {
+    vbios_resolution_type1 * ptr = ((vbios_resolution_type1*)(map->bios_ptr + res)); 
+    return ptr;
+}
+
+vbios_resolution_type2 * map_type2_resolution(vbios_map * map, word res) {
+    vbios_resolution_type2 * ptr = ((vbios_resolution_type2*)(map->bios_ptr + res)); 
+    return ptr;
+}
+
+vbios_resolution_type3 * map_type3_resolution(vbios_map * map, word res) {
+    vbios_resolution_type3 * ptr = ((vbios_resolution_type3*)(map->bios_ptr + res)); 
+    return ptr;
+}
+
+boolean detect_bios_type(vbios_map * map, boolean modeline, int entry_size) {
+    int i;
+    short int r1, r2;
+    
+    r1 = r2 = 32000;
+
+    for (i=0; i < map->mode_table_size; i++) {
+        if (map->mode_table[i].resolution <= r1) {
+            r1 = map->mode_table[i].resolution;
+    	}
+        else {
+            if (map->mode_table[i].resolution <= r2) {
+            	r2 = map->mode_table[i].resolution;
+            }
+    	}
+
+        /*printf("r1 = %d  r2 = %d\n", r1, r2);*/
+    }
+
+    return (r2-r1-6) % entry_size == 0;
+}
+
+void close_vbios(vbios_map * map);
+
+vbios_map * open_vbios(chipset_type forced_chipset) {
+    int z;
+    vbios_map * map = NEW(vbios_map);
+    for(z=0; z<sizeof(vbios_map); z++) ((char*)map)[z]=0;
+    /*
+     * Determine chipset
+     */
+
+    if (forced_chipset == CT_UNKWN) {
+        map->chipset_id = get_chipset_id();
+        map->chipset = get_chipset(map->chipset_id);
+    }
+    else if (forced_chipset != CT_UNKWN) {
+        map->chipset = forced_chipset;
+    }
+    else {
+        map->chipset = CT_915GM;
+    }
+    
+    /*
+     *  Map the video bios to memory
+     */
+
+    map->bios_ptr=(char*)VBIOS_START;
+
+    /*
+     * check if we have ATI Radeon
+     */
+    
+    /*if (memmem(map->bios_ptr, VBIOS_SIZE, ATI_SIGNATURE1, strlen(ATI_SIGNATURE1)) ||
+        memmem(map->bios_ptr, VBIOS_SIZE, ATI_SIGNATURE2, strlen(ATI_SIGNATURE2)) ) {
+        grub_printf(stderr, "ATI chipset detected.  915resolution only works with Intel 800/900 series graphic chipsets.\n");
+        return 0;
+    }*/
+
+    /*
+     * check if we have NVIDIA
+     */
+    
+    /*if (memmem(map->bios_ptr, VBIOS_SIZE, NVIDIA_SIGNATURE, strlen(NVIDIA_SIGNATURE))) {
+        grub_printf("NVIDIA chipset detected.  915resolution only works with Intel 800/900 series graphic chipsets.\n");
+        return 0;
+    }*/
+
+    /*
+     * check if we have Intel
+     */
+    
+    /*if (map->chipset == CT_UNKWN && memmem(map->bios_ptr, VBIOS_SIZE, INTEL_SIGNATURE, strlen(INTEL_SIGNATURE))) {
+        grub_printf( "Intel chipset detected.  However, 915resolution was unable to determine the chipset type.\n");
+
+        grub_printf("Chipset Id: %x\n", map->chipset_id);
+
+        grub_printf("Please report this problem to [e-mail]\n");
+
+        close_vbios(map);
+        return 0;
+    }*/
+
+    /*
+     * check for others
+     */
+
+    if (map->chipset == CT_UNKWN) {
+        grub_printf("Unknown chipset type and unrecognized bios.\n");
+        
+        grub_printf("915resolution only works with Intel 800/900 series graphic chipsets.\n");
+
+        grub_printf("Chipset Id: %x\n", map->chipset_id);
+        close_vbios(map);
+        return 0;
+    }
+
+    /*
+     * Figure out where the mode table is 
+     */
+
+    {
+        address p = map->bios_ptr + 16;
+        address limit = map->bios_ptr + VBIOS_SIZE - (3 * sizeof(vbios_mode));
+        
+        while (p < limit && map->mode_table == 0) {
+            vbios_mode * mode_ptr = (vbios_mode *) p;
+            
+            if (((mode_ptr[0].mode & 0xf0) == 0x30) && ((mode_ptr[1].mode & 0xf0) == 0x30) &&
+                ((mode_ptr[2].mode & 0xf0) == 0x30) && ((mode_ptr[3].mode & 0xf0) == 0x30)) {
+                map->mode_table = mode_ptr;
+            }
+            
+            p++;
+        }
+
+        if (map->mode_table == 0) {
+            grub_printf("Unable to locate the mode table.\n");
+            grub_printf("Please run the program 'dump_bios' as root and\n");
+            grub_printf("email the file 'vbios.dmp' to [e-mail].\n");
+            grub_printf("Chipset: %s\n", chipset_type_names[map->chipset]);
+            close_vbios(map);
+            return 0;
+        }
+    }
+
+    /*
+     * Determine size of mode table
+     */
+    
+    {
+        vbios_mode * mode_ptr = map->mode_table;
+        
+        while (mode_ptr->mode != 0xff) {
+            map->mode_table_size++;
+            mode_ptr++;
+        }
+    }
+
+    /*
+     * Figure out what type of bios we have
+     *  order of detection is important
+     */
+
+    if (detect_bios_type(map, TRUE, sizeof(vbios_modeline_type3))) {
+        map->bios = BT_3;
+    }
+    else if (detect_bios_type(map, TRUE, sizeof(vbios_modeline_type2))) {
+        map->bios = BT_2;
+    }
+    else if (detect_bios_type(map, FALSE, sizeof(vbios_resolution_type1))) {
+        map->bios = BT_1;
+    }
+    else {
+        grub_printf("Unable to determine bios type.\n");
+        grub_printf("Please run the program 'dump_bios' as root and\n");
+        grub_printf("email the file 'vbios.dmp' to [e-mail].\n");
+
+        grub_printf("Chipset: %s\n", chipset_type_names[map->chipset]);
+        grub_printf("Mode Table Offset: $C0000 + $%x\n", ((cardinal)map->mode_table) - ((cardinal)map->bios_ptr));
+
+        grub_printf("Mode Table Entries: %u\n", map->mode_table_size);
+        return 0;
+    }
+
+    return map;
+}
+
+void close_vbios(vbios_map * map) {
+    FREE(map);
+}
+
+void unlock_vbios(vbios_map * map) {
+
+    map->unlocked = TRUE;
+    
+    switch (map->chipset) {
+    case CT_UNKWN:
+        break;
+    case CT_830:
+    case CT_855GM:
+        grub_outl(0x8000005a, 0xcf8);
+        map->b1 = grub_inb(0xcfe);
+        
+        grub_outl(0x8000005a, 0xcf8);
+        grub_outb(0x33, 0xcfe);
+        break;
+    case CT_845G:
+    case CT_865G:
+    case CT_915G:
+    case CT_915GM:
+    case CT_945G:
+    case CT_945GM:
+    case CT_945GME:
+    case CT_946GZ:
+    case CT_G965:
+    case CT_Q965:
+        grub_outl(0x80000090, 0xcf8);
+        map->b1 = grub_inb(0xcfd);
+        map->b2 = grub_inb(0xcfe);
+        grub_outl(0x80000090, 0xcf8);
+        grub_outb(0x33, 0xcfd);
+        grub_outb(0x33, 0xcfe);
+        break;
+    }
+
+#if DEBUG
+    {
+        cardinal t = grub_inl(0xcfc);
+        grub_printf("unlock PAM: (0x%08x)\n", t);
+    }
+#endif
+}
+
+void relock_vbios(vbios_map * map) {
+
+    map->unlocked = FALSE;
+    
+    switch (map->chipset) {
+    case CT_UNKWN:
+        break;
+    case CT_830:
+    case CT_855GM:
+        grub_outl(0x8000005a, 0xcf8);
+        grub_outb(map->b1, 0xcfe);
+        break;
+    case CT_845G:
+    case CT_865G:
+    case CT_915G:
+    case CT_915GM:
+    case CT_945G:
+    case CT_945GM:
+    case CT_945GME:
+    case CT_946GZ:
+    case CT_G965:
+    case CT_Q965:
+        grub_outl(0x80000090, 0xcf8);
+        grub_outb(map->b1, 0xcfd);
+        grub_outb(map->b2, 0xcfe);
+        break;
+    }
+
+#if DEBUG
+    {
+        cardinal t = inl(0xcfc);
+        grub_printf("relock PAM: (0x%08x)\n", t);
+    }
+#endif
+}
+
+        
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+void list_modes(vbios_map *map, cardinal raw) {
+    cardinal i, x, y;
+
+    for (i=0; i < map->mode_table_size; i++) {
+        switch(map->bios) {
+        case BT_1:
+            {
+                vbios_resolution_type1 * res = map_type1_resolution(map, map->mode_table[i].resolution);
+                
+                x = ((((cardinal) res->x2) & 0xf0) << 4) | res->x1;
+                y = ((((cardinal) res->y2) & 0xf0) << 4) | res->y1;
+                
+                if (x != 0 && y != 0) {
+                    grub_printf("Mode %02x : %dx%d, %d bits/pixel\n", map->mode_table[i].mode, x, y, map->mode_table[i].bits_per_pixel);
+                }
+
+		if (raw)
+		{
+                    grub_printf("Mode %02x (raw) :\n\t%02x %02x\n\t%02x\n\t%02x\n\t%02x\n\t%02x\n\t%02x\n\t%02x\n", map->mode_table[i].mode, res->unknow1[0],res->unknow1[1], res->x1,res->x_total,res->x2,res->y1,res->y_total,res->y2);
+		}
+
+            }
+            break;
+        case BT_2:
+            {
+                vbios_resolution_type2 * res = map_type2_resolution(map, map->mode_table[i].resolution);
+                
+                x = res->modelines[0].x1+1;
+                y = res->modelines[0].y1+1;
+
+                if (x != 0 && y != 0) {
+                    grub_printf("Mode %02x : %dx%d, %d bits/pixel\n", map->mode_table[i].mode, x, y, map->mode_table[i].bits_per_pixel);
+                }
+            }
+            break;
+        case BT_3:
+            {
+                vbios_resolution_type3 * res = map_type3_resolution(map, map->mode_table[i].resolution);
+                
+                x = res->modelines[0].x1+1;
+                y = res->modelines[0].y1+1;
+                
+                if (x != 0 && y != 0) {
+                    grub_printf("Mode %02x : %dx%d, %d bits/pixel\n", map->mode_table[i].mode, x, y, map->mode_table[i].bits_per_pixel);
+                }
+            }
+            break;
+        case BT_UNKWN:
+            break;
+        }
+    }
+}
+
+
+
+
+
+static void gtf_timings(int x, int y, int freq,
+        unsigned long *clock,
+        word *hsyncstart, word *hsyncend, word *hblank,
+        word *vsyncstart, word *vsyncend, word *vblank)
+{
+    int hbl, vbl, vfreq;
+
+    vbl = y + (y+1)/(20000.0/(11*freq) - 1) + 1.5;
+    vfreq = vbl * freq;
+    hbl = 16 * (int)(x * (30.0 - 300000.0 / vfreq) /
+            (70.0 + 300000.0 / vfreq) / 16.0 + 0.5);
+
+    *vsyncstart = y;
+    *vsyncend = y + 3;
+    *vblank = vbl - 1;
+    *hsyncstart = x + hbl / 2 - (x + hbl + 50) / 100 * 8 - 1;
+    *hsyncend = x + hbl / 2 - 1;
+    *hblank = x + hbl - 1;
+    *clock = (x + hbl) * vfreq / 1000;
+}
+
+void set_mode(vbios_map * map, cardinal mode, cardinal x, cardinal y, cardinal bp, cardinal htotal, cardinal vtotal) {
+    int xprev, yprev;
+    cardinal i, j;
+
+    for (i=0; i < map->mode_table_size; i++) {
+        if (map->mode_table[i].mode == mode) {
+            switch(map->bios) {
+            case BT_1:
+                {
+                    vbios_resolution_type1 * res = map_type1_resolution(map, map->mode_table[i].resolution);
+                    
+                    if (bp) {
+                        map->mode_table[i].bits_per_pixel = bp;
+                    }
+                    
+                    res->x2 = (htotal?(((htotal-x) >> 8) & 0x0f) : (res->x2 & 0x0f)) | ((x >> 4) & 0xf0);
+                    res->x1 = (x & 0xff);
+                    
+                    res->y2 = (vtotal?(((vtotal-y) >> 8) & 0x0f) : (res->y2 & 0x0f)) | ((y >> 4) & 0xf0);
+                    res->y1 = (y & 0xff);
+		    if (htotal)
+			res->x_total = ((htotal-x) & 0xff);
+
+		    if (vtotal)
+			res->y_total = ((vtotal-y) & 0xff);
+                }
+                break;
+            case BT_2:
+                {
+                    vbios_resolution_type2 * res = map_type2_resolution(map, map->mode_table[i].resolution);
+
+                    res->xchars = x / 8;
+                    res->ychars = y / 16 - 1;
+                    xprev = res->modelines[0].x1;
+                    yprev = res->modelines[0].y1;
+
+                    for(j=0; j < 3; j++) {
+                        vbios_modeline_type2 * modeline = &res->modelines[j];
+                        
+                        if (modeline->x1 == xprev && modeline->y1 == yprev) {
+                            modeline->x1 = modeline->x2 = x-1;
+                            modeline->y1 = modeline->y2 = y-1;
+
+                            gtf_timings(x, y, freqs[j], &modeline->clock,
+                                    &modeline->hsyncstart, &modeline->hsyncend,
+                                    &modeline->hblank, &modeline->vsyncstart,
+                                    &modeline->vsyncend, &modeline->vblank);
+
+                            if (htotal)
+                                modeline->htotal = htotal;
+                            else
+                                modeline->htotal = modeline->hblank;
+
+                            if (vtotal)
+                                modeline->vtotal = vtotal;
+                            else
+                                modeline->vtotal = modeline->vblank;
+                        }
+                    }
+                }
+                break;
+            case BT_3:
+                {
+                    vbios_resolution_type3 * res = map_type3_resolution(map, map->mode_table[i].resolution);
+                    
+                    xprev = res->modelines[0].x1;
+                    yprev = res->modelines[0].y1;
+
+                    for (j=0; j < 3; j++) {
+                        vbios_modeline_type3 * modeline = &res->modelines[j];
+                        
+                        if (modeline->x1 == xprev && modeline->y1 == yprev) {
+                            modeline->x1 = modeline->x2 = x-1;
+                            modeline->y1 = modeline->y2 = y-1;
+                            
+                            gtf_timings(x, y, freqs[j], &modeline->clock,
+                                    &modeline->hsyncstart, &modeline->hsyncend,
+                                    &modeline->hblank, &modeline->vsyncstart,
+                                    &modeline->vsyncend, &modeline->vblank);
+                            if (htotal)
+                                modeline->htotal = htotal;
+                            else
+                                modeline->htotal = modeline->hblank;
+                            if (vtotal)
+                                modeline->vtotal = vtotal;
+                            else
+                                modeline->vtotal = modeline->vblank;
+
+                            modeline->timing_h   = y-1;
+                            modeline->timing_v   = x-1;
+                        }
+                    }
+                }
+                break;
+            case BT_UNKWN:
+                break;
+            }
+        }
+    }
+}   
+
+void display_map_info(vbios_map * map) {
+    grub_printf("Chipset: %s\n", chipset_type_names[map->chipset]);
+    grub_printf("BIOS: %s\n", bios_type_names[map->bios]);
+
+    grub_printf("Mode Table Offset: $C0000 + $%x\n", ((cardinal)map->mode_table) - ((cardinal)map->bios_ptr));
+    grub_printf("Mode Table Entries: %u\n", map->mode_table_size);
+}
+
+
+int parse_args(int argc, char *argv[], chipset_type *forced_chipset, cardinal *list, cardinal *mode, cardinal *x, cardinal *y, cardinal *bp, cardinal *raw, cardinal *htotal, cardinal *vtotal) {
+    cardinal index = 0;
+
+    *list = *mode = *x = *y = *raw = *htotal = *vtotal = 0;
+
+    *forced_chipset = CT_UNKWN;
+    
+
+    if ((argc > index) && !grub_strcmp(argv[index], "-c")) {
+        index++;
+
+        if(argc<=index) {
+            return 0;
+        }
+        
+        if (!grub_strcmp(argv[index], "845")) {
+            *forced_chipset = CT_845G;
+        }
+        else if (!grub_strcmp(argv[index], "855")) {
+            *forced_chipset = CT_855GM;
+        }
+        else if (!grub_strcmp(argv[index], "865")) {
+            *forced_chipset = CT_865G;
+        }
+        else if (!grub_strcmp(argv[index], "915G")) {
+            *forced_chipset = CT_915G;
+        }
+        else if (!grub_strcmp(argv[index], "915GM")) {
+            *forced_chipset = CT_915GM;
+        }
+        else if (!grub_strcmp(argv[index], "945G")) {
+            *forced_chipset = CT_945G;
+        }
+        else if (!grub_strcmp(argv[index], "945GM")) {
+            *forced_chipset = CT_945GM;
+        }
+        else if (!grub_strcmp(argv[index], "945GME")) {
+            *forced_chipset = CT_945GME;
+        }
+        else if (!grub_strcmp(argv[index], "946GZ")) {
+            *forced_chipset = CT_946GZ;
+        }
+        else if (!grub_strcmp(argv[index], "G965")) {
+            *forced_chipset = CT_G965;
+        }
+        else if (!grub_strcmp(argv[index], "Q965")) {
+            *forced_chipset = CT_Q965;
+        }
+        else {
+            *forced_chipset = CT_UNKWN;
+        }
+        
+        index++;
+        
+        if (argc<=index) {
+            return 0;
+        }
+    }
+
+    if ((argc > index) && !grub_strcmp(argv[index], "-l")) {
+        *list = 1;
+        index++;
+
+        if(argc<=index) {
+            return 0;
+        }
+    }
+    
+    if ((argc > index) && !grub_strcmp(argv[index], "-r")) {
+        *raw = 1;
+        index++;
+
+        if(argc<=index) {
+            return 0;
+        }
+    }
+    
+    if (argc-index < 3 || argc-index > 6) {
+        return -1;
+    }
+
+    *mode = (cardinal) grub_strtoul(argv[index], NULL, 16);
+    *x = (cardinal)grub_strtoul(argv[index+1], NULL, 10);
+    *y = (cardinal)grub_strtoul(argv[index+2], NULL, 10);
+
+
+    if (argc-index > 3) {
+        *bp = (cardinal)grub_strtoul(argv[index+3], NULL, 10);
+    }
+    else {
+        *bp = 0;
+    }
+    
+    if (argc-index > 4) {
+        *htotal = (cardinal)grub_strtoul(argv[index+4], NULL, 10);
+    }
+    else {
+        *htotal = 0;
+    }
+
+    if (argc-index > 5) {
+        *vtotal = (cardinal)grub_strtoul(argv[index+5], NULL, 10);
+    }
+    else {
+        *vtotal = 0;
+    }
+    
+    return 0;
+}
+
+void usage() {
+    grub_printf("Usage: 915resolution [-c chipset] [-l] [mode X Y] [bits/pixel] [htotal] [vtotal]\n");
+    grub_printf("  Set the resolution to XxY for a video mode\n");
+    grub_printf("  Bits per pixel are optional.  htotal/vtotal settings are additionally optional.\n");
+    grub_printf("  Options:\n");
+    grub_printf("    -c force chipset type (THIS IS USED FOR DEBUG PURPOSES)\n");
+    grub_printf("    -l display the modes found in the video BIOS\n");
+    grub_printf("    -r display the modes found in the video BIOS in raw mode (THIS IS USED FOR DEBUG PURPOSES)\n");
+}
+
+static grub_err_t
+grub_cmd_915resolution (struct grub_arg_list *state ,
+		int argc ,
+		char **argv )
+{
+    vbios_map * map;
+    cardinal list, mode, x, y, bp, raw, htotal, vtotal;
+    chipset_type forced_chipset;
+    
+    grub_printf("Intel 800/900 Series VBIOS Hack : version %s\n\n", VERSION);
+
+    if (parse_args(argc, argv, &forced_chipset, &list, &mode, &x, &y, &bp, &raw, &htotal, &vtotal) == -1) {
+        usage();
+        return 2;
+    }
+
+    map = open_vbios(forced_chipset);
+    display_map_info(map);
+
+    grub_printf("\n");
+
+    if (list) {
+        list_modes(map, raw);
+    }
+
+    if (mode!=0 && x!=0 && y!=0) {
+          unlock_vbios(map);
+
+        set_mode(map, mode, x, y, bp, htotal, vtotal);
+
+          relock_vbios(map);
+        
+        grub_printf("Patch mode %02x to resolution %dx%d complete\n", mode, x, y);
+        
+        if (list) {
+            list_modes(map, raw);
+        }
+    }
+
+    close_vbios(map);
+    
+    return 0;
+}
+
+
+
+
+
+
+
+GRUB_MOD_INIT(915resolution)
+{
+  (void)mod;			/* To stop warning. */
+  grub_register_command ("915resolution", grub_cmd_915resolution, GRUB_COMMAND_FLAG_BOTH,
+			 "915resolution", "Intel VBE editor", 0);
+}
+
+GRUB_MOD_FINI(915resolution)
+{
+  grub_unregister_command ("915resolution");
+}
diff -Naur grub-1.96.orig/conf/common.rmk grub-1.96/conf/common.rmk
--- grub-1.96.orig/conf/common.rmk	2008-02-03 06:11:29.000000000 -0700
+++ grub-1.96/conf/common.rmk	2008-04-20 22:48:18.000000000 -0600
@@ -232,7 +232,7 @@
 	cmp.mod cat.mod help.mod font.mod search.mod		\
 	loopback.mod configfile.mod echo.mod			\
 	terminfo.mod test.mod blocklist.mod hexdump.mod		\
-	read.mod
+	read.mod 915resolution.mod
 
 # For hello.mod.
 hello_mod_SOURCES = hello/hello.c
@@ -331,3 +331,8 @@
 read_mod_SOURCES = commands/read.c
 read_mod_CFLAGS = $(COMMON_CFLAGS)
 read_mod_LDFLAGS = $(COMMON_LDFLAGS)
+
+# For 915resolution.mod.
+915resolution_mod_SOURCES = 915resolution/915resolution.c
+915resolution_mod_CFLAGS = $(COMMON_CFLAGS)
+915resolution_mod_LDFLAGS = $(COMMON_LDFLAGS)