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[PATCH] Kernel support for VESA Bios Extension
|
From: |
Vesa Jääskeläinen |
|
Subject: |
[PATCH] Kernel support for VESA Bios Extension |
|
Date: |
Thu, 14 Jul 2005 21:36:59 +0300 |
|
User-agent: |
Mozilla Thunderbird (Windows/20050412) |
Hi,
Here is attached a patch that adds VBE support to kernel and include
file to make it easier to use it. There is diff for both i386-pc.rmk and
i386-pc.mk. Latter could be removed and let build process to generate
it again, but I think that .mk file is present in CVS so I left both there.
I will make separate patch for the frame buffer console after this is
first committed. (And I need to make some cleanups there first)
I would like to hear comments about the patch. I tried to implement most
commonly needed functions, so you can't do everything with this. As I
didn't need to use every function in my frame buffer console test, some
things might not work. But I tried to make my best to proof read every
function.
Thanks,
Vesa Jääskeläinen
diff -ruN grub2/ChangeLog grub2.vbe/ChangeLog
--- grub2/ChangeLog 2005-07-13 01:36:43.000000000 +0300
+++ grub2.vbe/ChangeLog 2005-07-16 15:07:01.132381816 +0300
@@ -1,3 +1,21 @@
+2005-07-14 Vesa Jaaskelainen <address@hidden>
+
+ * conf/i386-pc.rmk (kernel_img_HEADERS): Added machine/vbe.h.
+ * kern/i386/pc/startup.S: Updated Global Descriptor table's
+ descriptions.
+ (grub_vbe_get_controller_info): New function.
+ (grub_vbe_get_mode_info): Likewise.
+ (grub_vbe_set_mode): Likewise.
+ (grub_vbe_get_mode): Likewise.
+ (grub_vbe_set_memory_window): Likewise.
+ (grub_vbe_get_memory_window): Likewise.
+ (grub_vbe_set_scanline_length): Likewise.
+ (grub_vbe_get_scanline_length): Likewise.
+ (grub_vbe_set_display_start): Likewise.
+ (grub_vbe_get_display_start): Likewise.
+ (grub_vbe_set_palette_data): Likewise.
+ * include/grub/i386/pc/vbe.h: New file.
+
2005-07-12 Hollis Blanchard <address@hidden>
* disk/powerpc/ieee1275/ofdisk.c (grub_ofdisk_open): dprintf the
diff -ruN grub2/conf/i386-pc.mk grub2.vbe/conf/i386-pc.mk
--- grub2/conf/i386-pc.mk 2005-07-10 10:57:49.000000000 +0300
+++ grub2.vbe/conf/i386-pc.mk 2005-07-15 18:10:46.000000000 +0300
@@ -253,7 +253,8 @@
file.h fs.h kernel.h loader.h misc.h mm.h net.h rescue.h symbol.h \
term.h types.h machine/biosdisk.h machine/boot.h \
machine/console.h machine/init.h machine/memory.h \
- machine/loader.h partition.h pc_partition.h machine/time.h machine/vga.h
+ machine/loader.h partition.h pc_partition.h machine/time.h
machine/vga.h \
+ machine/vbe.h
kernel_img_CFLAGS = $(COMMON_CFLAGS)
kernel_img_ASFLAGS = $(COMMON_ASFLAGS)
kernel_img_LDFLAGS = -nostdlib -Wl,-N,-Ttext,8200
diff -ruN grub2/conf/i386-pc.rmk grub2.vbe/conf/i386-pc.rmk
--- grub2/conf/i386-pc.rmk 2005-07-10 10:57:49.000000000 +0300
+++ grub2.vbe/conf/i386-pc.rmk 2005-07-15 18:10:05.000000000 +0300
@@ -33,7 +33,8 @@
file.h fs.h kernel.h loader.h misc.h mm.h net.h rescue.h symbol.h \
term.h types.h machine/biosdisk.h machine/boot.h \
machine/console.h machine/init.h machine/memory.h \
- machine/loader.h partition.h pc_partition.h machine/time.h machine/vga.h
+ machine/loader.h partition.h pc_partition.h machine/time.h
machine/vga.h \
+ machine/vbe.h
kernel_img_CFLAGS = $(COMMON_CFLAGS)
kernel_img_ASFLAGS = $(COMMON_ASFLAGS)
kernel_img_LDFLAGS = -nostdlib -Wl,-N,-Ttext,8200
Files grub2/core.img and grub2.vbe/core.img differ
diff -ruN grub2/device.map grub2.vbe/device.map
--- grub2/device.map 1970-01-01 02:00:00.000000000 +0200
+++ grub2.vbe/device.map 2005-07-16 15:03:23.520463856 +0300
@@ -0,0 +1 @@
+(fd0) /dev/fd0
diff -ruN grub2/include/grub/i386/pc/vbe.h grub2.vbe/include/grub/i386/pc/vbe.h
--- grub2/include/grub/i386/pc/vbe.h 1970-01-01 02:00:00.000000000 +0200
+++ grub2.vbe/include/grub/i386/pc/vbe.h 2005-07-15 18:29:01.000000000
+0300
@@ -0,0 +1,161 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2005 Free Software Foundation, Inc.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef GRUB_VBE_MACHINE_HEADER
+#define GRUB_VBE_MACHINE_HEADER 1
+
+#include <grub/symbol.h>
+#include <grub/types.h>
+
+typedef grub_uint32_t grub_vbe_farptr_t;
+typedef grub_uint32_t grub_vbe_physptr_t;
+typedef grub_uint32_t grub_vbe_status_t;
+
+struct grub_vbe_info_block_t {
+ grub_uint8_t signature[4]; // 'VESA'
+ grub_uint16_t version; // VBE version BCD, for
used standard: 0x0300 (3.0)
+
+ grub_vbe_farptr_t oem_string_ptr; // Pointer to OEM string
+ grub_uint32_t capabilities; //
+ grub_vbe_farptr_t video_mode_ptr; // Pointer to VideoModeList
+ grub_uint16_t total_memory; // Number of 64k memory
blocks
+
+ grub_uint16_t oem_software_rev; // VBE implementation
software version
+ grub_vbe_farptr_t oem_vendor_name_ptr; // Pointer to Vendor
Name String
+ grub_vbe_farptr_t oem_product_name_ptr; // Pointer to Product
Name String
+ grub_vbe_farptr_t oem_product_rev_ptr; // Pointer to Product
Revision String
+
+ grub_uint8_t reserved[222];
+
+ grub_uint8_t oem_data[256]; // OEM Strings should
reside here
+} __attribute__ ((packed));
+
+struct grub_vbe_mode_info_block_t {
+ // Mandory information for all VBE revisions
+ grub_uint16_t mode_attributes; // Mode attributes
+ grub_uint8_t win_a_attributes; // Window A attributes
+ grub_uint8_t win_b_attributes; // Window B attributes
+ grub_uint16_t win_granularity; // Window granularity
+ grub_uint16_t win_size; // Window size
+ grub_uint16_t win_a_segment; // Window A start
segment
+ grub_uint16_t win_b_segment; // Window B start
segment
+ grub_vbe_farptr_t win_func_ptr; // Real mode pointer to window
function
+ grub_uint16_t bytes_per_scan_line; // Bytes per scan line
+
+ // Mandory information for VBE 1.2 and above
+ grub_uint16_t x_resolution;
+ grub_uint16_t y_resolution;
+ grub_uint8_t x_char_size;
+ grub_uint8_t y_char_size;
+ grub_uint8_t number_of_planes;
+ grub_uint8_t bits_per_pixel;
+ grub_uint8_t number_of_banks;
+ grub_uint8_t memory_model;
+ grub_uint8_t bank_size;
+ grub_uint8_t number_of_image_pages;
+ grub_uint8_t reserved;
+
+ // Direct Color fields (required for direct/6 and YUV/7 memory models)
+ grub_uint8_t red_mask_size;
+ grub_uint8_t red_field_position;
+ grub_uint8_t green_mask_size;
+ grub_uint8_t green_field_position;
+ grub_uint8_t blue_mask_size;
+ grub_uint8_t blue_field_position;
+ grub_uint8_t rsvd_mask_size;
+ grub_uint8_t rsvd_field_position;
+ grub_uint8_t direct_color_mode_info;
+
+ // Mandory information for VBE 2.0 and above
+ grub_vbe_physptr_t phys_base_addr; // Physical address for flat
memory frame buffer
+ grub_uint32_t reserved2;
+ grub_uint16_t reserved3;
+
+ // Mandory information for VBE 3.0 and above
+ grub_uint16_t lin_bytes_per_scan_line;
+ grub_uint8_t bnk_number_of_image_pages;
+ grub_uint8_t lin_number_of_image_pages;
+ grub_uint8_t lin_red_mask_size;
+ grub_uint8_t lin_red_field_position;
+ grub_uint8_t lin_green_mask_size;
+ grub_uint8_t lin_green_field_position;
+ grub_uint8_t lin_blue_mask_size;
+ grub_uint8_t lin_blue_field_position;
+ grub_uint8_t lin_rsvd_mask_size;
+ grub_uint8_t lin_rsvd_field_position;
+ grub_uint32_t max_pixel_clock;
+
+ // Fill
+ grub_uint8_t reserved4[189+1]; // Spec says 189 but it's total size
should be 256
+} __attribute__ ((packed));
+
+struct grub_vbe_crtc_info_block_t {
+ grub_uint16_t horizontal_total;
+ grub_uint16_t horizontal_sync_start;
+ grub_uint16_t horizontal_sync_end;
+ grub_uint16_t vertical_total;
+ grub_uint16_t vertical_sync_start;
+ grub_uint16_t vertical_sync_end;
+ grub_uint8_t flags;
+ grub_uint32_t pixel_clock;
+ grub_uint16_t refresh_rate;
+ grub_uint8_t reserved[40];
+} __attribute__ ((packed));
+
+struct grub_vbe_palette_data_t {
+ grub_uint8_t blue;
+ grub_uint8_t green;
+ grub_uint8_t red;
+ grub_uint8_t aligment;
+} __attribute__ ((packed));
+
+/* Call VESA BIOS 0x4f00 to get VBE Controller Information, return VBE status
*/
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_controller_info) (struct
grub_vbe_info_block_t *controller_info);
+
+/* Call VESA BIOS 0x4f01 to get VBE Mode Information, return VBE status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_mode_info) (grub_uint32_t mode,
struct grub_vbe_mode_info_block_t *mode_info);
+
+/* Call VESA BIOS 0x4f02 to set video mode, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_set_mode) (grub_uint32_t mode, struct
grub_vbe_crtc_info_block_t *crtc_info);
+
+/* Call VESA BIOS 0x4f03 to return current VBE Mode, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_mode) (grub_uint32_t *mode);
+
+/* Call VESA BIOS 0x4f05 to set memory window, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_set_memory_window) (grub_uint32_t
window, grub_uint32_t position);
+
+/* Call VESA BIOS 0x4f05 to return memory window, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_memory_window) (grub_uint32_t
window, grub_uint32_t *position);
+
+/* Call VESA BIOS 0x4f06 to set scanline length (in bytes), return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_set_scanline_length) (grub_uint32_t
length);
+
+/* Call VESA BIOS 0x4f06 to return scanline length (in bytes), return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_scanline_length) (grub_uint32_t
*length);
+
+/* Call VESA BIOS 0x4f07 to set display start, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_set_display_start) (grub_uint32_t x,
grub_uint32_t y);
+
+/* Call VESA BIOS 0x4f07 to get display start, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_get_display_start) (grub_uint32_t *x,
grub_uint32_t *y);
+
+/* Call VESA BIOS 0x4f09 to set palette data, return status */
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_set_palette_data) (grub_uint32_t
color_count, grub_uint32_t start_index, struct grub_vbe_palette_data_t
*palette_data);
+
+#endif /* ! GRUB_VBE_MACHINE_HEADER */
diff -ruN grub2/kern/i386/pc/startup.S grub2.vbe/kern/i386/pc/startup.S
--- grub2/kern/i386/pc/startup.S 2004-04-04 16:46:02.000000000 +0300
+++ grub2.vbe/kern/i386/pc/startup.S 2005-07-16 15:03:13.895927008 +0300
@@ -1,6 +1,6 @@
/*
* GRUB -- GRand Unified Bootloader
- * Copyright (C) 1999,2000,2001,2002,2003 Free Software Foundation, Inc.
+ * Copyright (C) 1999,2000,2001,2002,2003,2005 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -219,11 +219,11 @@
* 31 24 19 16 7 0
* ------------------------------------------------------------
* | | |B| |A| | | |1|0|E|W|A| |
- * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |
+ * | BASE 31..24 |G|/|L|V| LIMIT |P|DPL| TYPE | BASE 23:16 | 4
* | | |D| |L| 19..16| | |1|1|C|R|A| |
* ------------------------------------------------------------
* | | |
- * | BASE 15..0 | LIMIT 15..0 |
+ * | BASE 15..0 | LIMIT 15..0 | 0
* | | |
* ------------------------------------------------------------
*
@@ -236,19 +236,31 @@
.word 0, 0
.byte 0, 0, 0, 0
- /* code segment */
+ /* -- code segment --
+ * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
+ * type = 32bit code execute/read, DPL = 0
+ */
.word 0xFFFF, 0
.byte 0, 0x9A, 0xCF, 0
- /* data segment */
+ /* -- data segment --
+ * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
+ * type = 32 bit data read/write, DPL = 0
+ */
.word 0xFFFF, 0
.byte 0, 0x92, 0xCF, 0
- /* 16 bit real mode CS */
+ /* -- 16 bit real mode CS --
+ * base = 0x00000000, limit 0x0FFFF (1 B Granularity), present
+ * type = 16 bit code execute/read only/conforming, DPL = 0
+ */
.word 0xFFFF, 0
.byte 0, 0x9E, 0, 0
- /* 16 bit real mode DS */
+ /* -- 16 bit real mode DS --
+ * base = 0x00000000, limit 0x0FFFF (1 B Granularity), present
+ * type = 16 bit data read/write, DPL = 0
+ */
.word 0xFFFF, 0
.byte 0, 0x92, 0, 0
@@ -1594,3 +1606,406 @@
popl %ebx
popl %ebp
ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_controller_info (struct
grub_vbe_info_block_t *controller_info)
+ *
+ * Register allocations for parameters:
+ * %eax *controller_info
+ */
+FUNCTION(grub_vbe_get_controller_info)
+ pushl %ebp
+ pushl %edi
+
+ movw %ax, %di /* store *controller_info to edx:di */
+ xorw %ax, %ax
+ shrl $4, %eax
+ mov %eax, %edx /* prot_to_real destroys %eax */
+
+ call prot_to_real
+ .code16
+
+ pushw %es
+
+ movw %dx, %es /* *controller_info is now on es:di */
+ movw $0x4f00, %ax
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ popw %es
+
+ DATA32 call real_to_prot
+ .code32
+
+ movl %edx, %eax
+ andl $0x0FFFF, %eax /* return value in %eax */
+
+ popl %edi
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_mode_info (grub_uint32_t mode, struct
grub_vbe_mode_info_block_t *mode_info)
+ *
+ * Register allocations for parameters:
+ * %eax mode
+ * %edx *mode_info
+ */
+FUNCTION(grub_vbe_get_mode_info)
+ pushl %ebp
+ pushl %edi
+
+ movl %eax, %ecx /* store mode number to %ecx */
+
+ movw %dx, %di /* store *mode_info to edx:di*/
+ xorw %dx, %dx
+ shrl $4, %edx
+
+ call prot_to_real
+ .code16
+
+ pushw %es
+
+ movw %dx, %es /* *mode_info is now on es:di */
+ movw $0x4f01, %ax
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ popw %es
+
+ DATA32 call real_to_prot
+ .code32
+
+ movl %edx, %eax
+ andl $0x0FFFF, %eax /* return value in %eax */
+
+ popl %edi
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_set_mode (grub_uint32_t mode, struct
grub_vbe_crtc_info_block_t *crtc_info)
+ *
+ * Register allocations for parameters:
+ * %eax mode
+ * %edx *crtc_info
+ */
+FUNCTION(grub_vbe_set_mode)
+ pushl %ebp
+ pushl %ebx
+
+ movl %eax, %ebx /* store mode in ebx */
+
+ movw %dx, %di /* store *crtc_info to edx:di*/
+ xorw %dx, %dx
+ shrl $4, %edx
+
+ call prot_to_real
+ .code16
+
+ pushw %es
+
+ movw %dx, %es /* *crtc_info is now on es:di */
+
+ movw $0x4f02, %ax
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ popw %es
+
+ DATA32 call real_to_prot
+ .code32
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_mode (grub_uint32_t *mode)
+ *
+ * Register allocations for parameters:
+ * %eax *mode
+ */
+FUNCTION(grub_vbe_get_mode)
+ pushl %ebp
+ pushl %ebx
+ pushl %eax /* push *mode to stack */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f03, %ax
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ popl %edi /* pops *mode from stack to %edi */
+ andl $0xFFFF, %ebx
+ movl %ebx, (%edi)
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_set_memory_window (grub_uint32_t window,
grub_uint32_t position);
+ *
+ * Register allocations for parameters:
+ * %eax window
+ * %edx position
+ */
+FUNCTION(grub_vbe_set_memory_window)
+ pushl %ebp
+ pushl %ebx
+
+ movl %eax, %ebx
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f05, %ax
+ andw $0x00ff, %bx /* BL = window, BH = 0, Set memory
window */
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_memory_window (grub_uint32_t window,
grub_uint32_t *position);
+ *
+ * Register allocations for parameters:
+ * %eax window
+ * %edx *position
+ */
+FUNCTION(grub_vbe_get_memory_window)
+ pushl %ebp
+ pushl %ebx
+ pushl %edx /* push *position to stack */
+
+ movl %eax, %ebx /* store window in ebx */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f05, %ax
+ andw $0x00ff, %bx /* BL = window */
+ orw $0x0100, %bx /* BH = 1, Get memory window */
+ int $0x10
+
+ movw %ax, %bx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ popl %edi /* pops *position from stack to %edi */
+ andl $0xFFFF, %edx
+ movl %edx, (%edi) /* return position to caller */
+
+ movw %bx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_set_scanline_length (grub_uint32_t length)
+ *
+ * Register allocations for parameters:
+ * %eax length
+ */
+FUNCTION(grub_vbe_set_scanline_length)
+ pushl %ebp
+ pushl %ebx
+
+ movl %eax, %ecx /* store length in ecx */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f06, %ax
+ movw $0x0002, %bx /* BL = 2, Set Scan Line in Bytes */
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_scanline_length (grub_uint32_t *length)
+ *
+ * Register allocations for parameters:
+ * %eax *length
+ */
+FUNCTION(grub_vbe_get_scanline_length)
+ pushl %ebp
+ pushl %ebx
+ pushl %edx /* push *length to stack */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f06, %ax
+ movw $0x0001, %bx /* BL = 1, Get Scan Line Length (in
bytes) */
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ popl %edi /* pops *length from stack to %edi */
+ andl $0xFFFF, %ebx
+ movl %ebx, (%edi) /* return length to caller */
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_set_display_start (grub_uint32_t x,
grub_uint32_t y)
+ *
+ * Register allocations for parameters:
+ * %eax x
+ * %edx y
+ */
+FUNCTION(grub_vbe_set_display_start)
+ pushl %ebp
+ pushl %ebx
+
+ movl %eax, %ecx /* store x in ecx */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f07, %ax
+ movw $0x0080, %bx /* BL = 80h, Set Display Start during
Vertical Retrace */
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_get_display_start (grub_uint32_t *x,
grub_uint32_t *y)
+ *
+ * Register allocations for parameters:
+ * %eax *x
+ * %edx *y
+ */
+FUNCTION(grub_vbe_get_display_start)
+ pushl %ebp
+ pushl %ebx
+ pushl %eax /* push *x to stack */
+ pushl %edx /* push *y to stack */
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f07, %ax
+ movw $0x0001, %bx /* BL = 1, Get Display Start */
+ int $0x10
+
+ movw %ax, %bx /* real_to_prot destroys %eax */
+
+ DATA32 call real_to_prot
+ .code32
+
+ popl %edi /* pops *y from stack to %edi */
+ andl $0xFFFF, %edx
+ movl %edx, (%edi) /* return y-position to caller */
+
+ popl %edi /* pops *x from stack to %edi */
+ andl $0xFFFF, %ecx
+ movl %ecx, (%edi) /* return x-position to caller */
+
+ movw %bx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
+ * grub_vbe_status_t grub_vbe_set_palette_data (grub_uint32_t color_count,
grub_uint32_t start_index, struct grub_vbe_palette_data_t *palette_data)
+ *
+ * Register allocations for parameters:
+ * %eax color_count
+ * %edx start_index
+ * %ecx *palette_data
+ */
+FUNCTION(grub_vbe_set_palette_data)
+ pushl %ebp
+ pushl %ebx
+
+ movl %eax, %ebx /* store color_count in ebx */
+
+ movw %cx, %di /* store *palette_data to ecx:di */
+ xorw %cx, %cx
+ shrl $4, %ecx
+
+ call prot_to_real
+ .code16
+
+ pushw %es
+
+ movw %cx, %es /* *palette_data is now on es:di */
+ movw %bx, %cx /* color_count is now on cx */
+
+ movw $0x4f09, %ax
+ xorw %bx, %bx /* BL = 0, Set Palette Data */
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax */
+
+ popw %es
+
+ DATA32 call real_to_prot
+ .code32
+
+ movw %dx, %ax
+ andl $0xFFFF, %eax /* return value in %eax */
+
+ popl %ebx
+ popl %ebp
+ ret
- [PATCH] Kernel support for VESA Bios Extension,
Vesa Jääskeläinen <=
- Re: [PATCH] Kernel support for VESA Bios Extension, Marco Gerards, 2005/07/14
- Re: [PATCH] Kernel support for VESA Bios Extension, Vesa Jääskeläinen, 2005/07/14
- Re: [PATCH] Kernel support for VESA Bios Extension, Marco Gerards, 2005/07/14
- Re: [PATCH] Kernel support for VESA Bios Extension, Yoshinori K. Okuji, 2005/07/15
- Re: [PATCH] Kernel support for VESA Bios Extension, Vesa Jääskeläinen, 2005/07/15
- Re: [PATCH] Kernel support for VESA Bios Extension, Yoshinori K. Okuji, 2005/07/15
- Re: [PATCH] Kernel support for VESA Bios Extension, Marco Gerards, 2005/07/16