Mailing List Archive

Currently the offsets into the boot_video_info struct are manually encoded in
video.S, which is fragile. Generate them in asm-offsets.c and switch the
current code to use those instead.

No functional change intended.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
xen/arch/x86/boot/video.S | 83 ++++++++++++-------------------
xen/arch/x86/x86_64/asm-offsets.c | 26 ++++++++++
2 files changed, 58 insertions(+), 51 deletions(-)

diff --git a/xen/arch/x86/boot/video.S b/xen/arch/x86/boot/video.S
index 0ae04f270f8c..a4b25a3b34d1 100644
--- a/xen/arch/x86/boot/video.S
+++ b/xen/arch/x86/boot/video.S
@@ -26,32 +26,13 @@
/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
#undef CONFIG_VIDEO_400_HACK

-/* Positions of various video parameters passed to the kernel */
-/* (see also include/linux/tty.h) */
-#define PARAM_CURSOR_POS 0x00
-#define PARAM_VIDEO_MODE 0x02
-#define PARAM_VIDEO_COLS 0x03
-#define PARAM_VIDEO_LINES 0x04
-#define PARAM_HAVE_VGA 0x05
-#define PARAM_FONT_POINTS 0x06
-#define PARAM_CAPABILITIES 0x08
-#define PARAM_LFB_LINELENGTH 0x0c
-#define PARAM_LFB_WIDTH 0x0e
-#define PARAM_LFB_HEIGHT 0x10
-#define PARAM_LFB_DEPTH 0x12
-#define PARAM_LFB_BASE 0x14
-#define PARAM_LFB_SIZE 0x18
-#define PARAM_LFB_COLORS 0x1c
-#define PARAM_VESAPM_SEG 0x24
-#define PARAM_VESAPM_OFF 0x26
-#define PARAM_VESA_ATTRIB 0x28
#define _param(param) bootsym(boot_vid_info)+(param)

video: xorw %ax, %ax
movw %ax, %gs # GS is zero
cld
call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
- cmpb $0,_param(PARAM_HAVE_VGA)
+ cmpb $0,_param(BVI_have_vga)
je 1f # Bail if there's no VGA
movw bootsym(boot_vid_mode), %ax # User selected video mode
cmpw $ASK_VGA, %ax # Bring up the menu
@@ -69,7 +50,7 @@ vid1: call store_edid

# Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
basic_detect:
- movb $0, _param(PARAM_HAVE_VGA)
+ movb $0, _param(BVI_have_vga)
movb $0x12, %ah # Check EGA/VGA
movb $0x10, %bl
int $0x10
@@ -79,7 +60,7 @@ basic_detect:
int $0x10
cmpb $0x1a, %al # 1a means VGA...
jne basret # anything else is EGA.
- incb _param(PARAM_HAVE_VGA) # We've detected a VGA
+ incb _param(BVI_have_vga) # We've detected a VGA
basret: ret

# Store the video mode parameters for later usage by the kernel.
@@ -92,57 +73,57 @@ mode_params:
movb $0x03, %ah # Read cursor position
xorb %bh, %bh
int $0x10
- movw %dx, _param(PARAM_CURSOR_POS)
+ movw %dx, _param(BVI_cursor_pos)
movb $0x0f, %ah # Read page/mode/width
int $0x10
- movw %ax, _param(PARAM_VIDEO_MODE) # Video mode and screen width
+ movw %ax, _param(BVI_video_mode) # Video mode and screen width
movw %gs:(0x485), %ax # Font size
- movw %ax, _param(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
+ movw %ax, _param(BVI_font_points) # (valid only on EGA/VGA)
movw bootsym(force_size), %ax # Forced size?
orw %ax, %ax
jz mopar1

- movb %ah, _param(PARAM_VIDEO_COLS)
- movb %al, _param(PARAM_VIDEO_LINES)
+ movb %ah, _param(BVI_video_cols)
+ movb %al, _param(BVI_video_lines)
ret

mopar1: movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
incb %al # location of max lines.
-mopar2: movb %al, _param(PARAM_VIDEO_LINES)
+mopar2: movb %al, _param(BVI_video_lines)
ret

# Fetching of VESA frame buffer parameters
mopar_gr:
movw $vesa_mode_info, %di
- movb $0x23, _param(PARAM_HAVE_VGA)
+ movb $0x23, _param(BVI_have_vga)
movw 16(%di), %ax
- movw %ax, _param(PARAM_LFB_LINELENGTH)
+ movw %ax, _param(BVI_lfb_linelength)
movw 18(%di), %ax
- movw %ax, _param(PARAM_LFB_WIDTH)
+ movw %ax, _param(BVI_lfb_width)
movw 20(%di), %ax
- movw %ax, _param(PARAM_LFB_HEIGHT)
+ movw %ax, _param(BVI_lfb_height)
movzbw 25(%di), %ax
- movw %ax, _param(PARAM_LFB_DEPTH)
+ movw %ax, _param(BVI_lfb_depth)
movl 40(%di), %eax
- movl %eax, _param(PARAM_LFB_BASE)
+ movl %eax, _param(BVI_lfb_base)
movl 31(%di), %eax
- movl %eax, _param(PARAM_LFB_COLORS)
+ movl %eax, _param(BVI_lfb_colors)
movl 35(%di), %eax
- movl %eax, _param(PARAM_LFB_COLORS+4)
+ movl %eax, _param(BVI_lfb_colors+4)
movw 0(%di), %ax
- movw %ax, _param(PARAM_VESA_ATTRIB)
+ movw %ax, _param(BVI_vesa_attrib)

# get video mem size
movw $vesa_glob_info, %di
movzwl 18(%di), %eax
- movl %eax, _param(PARAM_LFB_SIZE)
+ movl %eax, _param(BVI_lfb_size)

# store mode capabilities
movl 10(%di), %eax
- movl %eax, _param(PARAM_CAPABILITIES)
+ movl %eax, _param(BVI_capabilities)

# switching the DAC to 8-bit is for <= 8 bpp only
- cmpw $8, _param(PARAM_LFB_DEPTH)
+ cmpw $8, _param(BVI_lfb_depth)
jg dac_done

# get DAC switching capability
@@ -160,16 +141,16 @@ mopar_gr:
dac_set:
# set color size to DAC size
movzbw bootsym(dac_size), %ax
- movb %al, _param(PARAM_LFB_COLORS+0)
- movb %al, _param(PARAM_LFB_COLORS+2)
- movb %al, _param(PARAM_LFB_COLORS+4)
- movb %al, _param(PARAM_LFB_COLORS+6)
+ movb %al, _param(BVI_lfb_colors+0)
+ movb %al, _param(BVI_lfb_colors+2)
+ movb %al, _param(BVI_lfb_colors+4)
+ movb %al, _param(BVI_lfb_colors+6)

# set color offsets to 0
- movb %ah, _param(PARAM_LFB_COLORS+1)
- movb %ah, _param(PARAM_LFB_COLORS+3)
- movb %ah, _param(PARAM_LFB_COLORS+5)
- movb %ah, _param(PARAM_LFB_COLORS+7)
+ movb %ah, _param(BVI_lfb_colors+1)
+ movb %ah, _param(BVI_lfb_colors+3)
+ movb %ah, _param(BVI_lfb_colors+5)
+ movb %ah, _param(BVI_lfb_colors+7)

dac_done:
# get protected mode interface information
@@ -180,8 +161,8 @@ dac_done:
cmp $0x004f, %ax
jnz no_pm

- movw %es, _param(PARAM_VESAPM_SEG)
- movw %di, _param(PARAM_VESAPM_OFF)
+ movw %es, _param(BVI_vesapm_seg)
+ movw %di, _param(BVI_vesapm_off)

no_pm: pushw %ds
popw %es
@@ -1018,7 +999,7 @@ GLOBAL(boot_vid_info)
.byte 80, 25 /* 80x25 */
.byte 1 /* isVGA */
.word 16 /* 8x16 font */
- .fill 0x28,1,0
+ .space BVI_size - BVI_capabilities
GLOBAL(boot_edid_info)
.fill 128,1,0x13
GLOBAL(boot_edid_caps)
diff --git a/xen/arch/x86/x86_64/asm-offsets.c b/xen/arch/x86/x86_64/asm-offsets.c
index d8903a3ce9c7..91da6b9d3885 100644
--- a/xen/arch/x86/x86_64/asm-offsets.c
+++ b/xen/arch/x86/x86_64/asm-offsets.c
@@ -16,6 +16,10 @@
#include <xen/multiboot.h>
#include <xen/multiboot2.h>

+#ifdef CONFIG_VIDEO
+# include "../boot/video.h"
+#endif
+
#define DEFINE(_sym, _val) \
asm volatile ( "\n.ascii\"==>#define " #_sym " %0 /* " #_val " */<==\""\
:: "i" (_val) )
@@ -208,4 +212,26 @@ void __dummy__(void)

OFFSET(DOMAIN_vm_assist, struct domain, vm_assist);
BLANK();
+
+#ifdef CONFIG_VIDEO
+ DEFINE(BVI_size, sizeof(struct boot_video_info));
+ OFFSET(BVI_cursor_pos, struct boot_video_info, orig_x);
+ OFFSET(BVI_video_mode, struct boot_video_info, orig_video_mode);
+ OFFSET(BVI_video_cols, struct boot_video_info, orig_video_cols);
+ OFFSET(BVI_video_lines, struct boot_video_info, orig_video_lines);
+ OFFSET(BVI_have_vga, struct boot_video_info, orig_video_isVGA);
+ OFFSET(BVI_font_points, struct boot_video_info, orig_video_points);
+ OFFSET(BVI_capabilities, struct boot_video_info, capabilities);
+ OFFSET(BVI_lfb_linelength, struct boot_video_info, lfb_linelength);
+ OFFSET(BVI_lfb_width, struct boot_video_info, lfb_width);
+ OFFSET(BVI_lfb_height, struct boot_video_info, lfb_height);
+ OFFSET(BVI_lfb_depth, struct boot_video_info, lfb_depth);
+ OFFSET(BVI_lfb_base, struct boot_video_info, lfb_base);
+ OFFSET(BVI_lfb_size, struct boot_video_info, lfb_size);
+ OFFSET(BVI_lfb_colors, struct boot_video_info, colors);
+ OFFSET(BVI_vesapm_seg, struct boot_video_info, vesapm.seg);
+ OFFSET(BVI_vesapm_off, struct boot_video_info, vesapm.off);
+ OFFSET(BVI_vesa_attrib, struct boot_video_info, vesa_attrib);
+ BLANK();
+#endif /* CONFIG_VIDEO */
}
--
2.44.0