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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] x86/boot: obtain video info from boot loader
commit 0faf37e7434ea08ed99d804aad98fcddf74852e7
Author: Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Apr 11 12:30:09 2022 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Apr 11 12:30:09 2022 +0200
x86/boot: obtain video info from boot loader
With MB2 the boot loader may provide this information, allowing us to
obtain it without needing to enter real mode (assuming we don't need to
set a new mode from "vga=", but can instead inherit the one the
bootloader may have established).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
xen/arch/x86/boot/defs.h | 1 +
xen/arch/x86/boot/head.S | 10 ++++-
xen/arch/x86/boot/reloc.c | 98 ++++++++++++++++++++++++++++++++++++++++----
xen/arch/x86/boot/video.h | 41 ++++++++++++++++++
xen/arch/x86/setup.c | 30 +-------------
xen/include/xen/multiboot2.h | 53 ++++++++++++++++++++++++
6 files changed, 195 insertions(+), 38 deletions(-)
diff --git a/xen/arch/x86/boot/defs.h b/xen/arch/x86/boot/defs.h
index 21d292cd73..f9840044ec 100644
--- a/xen/arch/x86/boot/defs.h
+++ b/xen/arch/x86/boot/defs.h
@@ -53,6 +53,7 @@ typedef unsigned int u32;
typedef unsigned long long u64;
typedef unsigned int size_t;
typedef u8 uint8_t;
+typedef u16 uint16_t;
typedef u32 uint32_t;
typedef u64 uint64_t;
diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index 92d73345f0..3db47197b8 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -562,12 +562,18 @@ trampoline_setup:
mov %esi, sym_esi(xen_phys_start)
mov %esi, sym_esi(trampoline_xen_phys_start)
- mov sym_esi(trampoline_phys), %ecx
-
/* Get bottom-most low-memory stack address. */
+ mov sym_esi(trampoline_phys), %ecx
add $TRAMPOLINE_SPACE,%ecx
+#ifdef CONFIG_VIDEO
+ lea sym_esi(boot_vid_info), %edx
+#else
+ xor %edx, %edx
+#endif
+
/* Save Multiboot / PVH info struct (after relocation) for later use.
*/
+ push %edx /* Boot video info to be filled from MB2.
*/
push %ecx /* Bottom-most low-memory stack address. */
push %ebx /* Multiboot / PVH information address. */
push %eax /* Magic number. */
diff --git a/xen/arch/x86/boot/reloc.c b/xen/arch/x86/boot/reloc.c
index 4f4039bb7c..e22bb974bf 100644
--- a/xen/arch/x86/boot/reloc.c
+++ b/xen/arch/x86/boot/reloc.c
@@ -14,9 +14,10 @@
/*
* This entry point is entered from xen/arch/x86/boot/head.S with:
- * - 0x4(%esp) = MAGIC,
- * - 0x8(%esp) = INFORMATION_ADDRESS,
- * - 0xc(%esp) = TOPMOST_LOW_MEMORY_STACK_ADDRESS.
+ * - 0x04(%esp) = MAGIC,
+ * - 0x08(%esp) = INFORMATION_ADDRESS,
+ * - 0x0c(%esp) = TOPMOST_LOW_MEMORY_STACK_ADDRESS.
+ * - 0x10(%esp) = BOOT_VIDEO_INFO_ADDRESS.
*/
asm (
" .text \n"
@@ -32,6 +33,39 @@ asm (
#include "../../../include/xen/kconfig.h"
#include <public/arch-x86/hvm/start_info.h>
+#ifdef CONFIG_VIDEO
+# include "video.h"
+
+/* VESA control information */
+struct __packed vesa_ctrl_info {
+ uint8_t signature[4];
+ uint16_t version;
+ uint32_t oem_name;
+ uint32_t capabilities;
+ uint32_t mode_list;
+ uint16_t mem_size;
+ /* We don't use any further fields. */
+};
+
+/* VESA 2.0 mode information */
+struct vesa_mode_info {
+ uint16_t attrib;
+ uint8_t window[14]; /* We don't use the individual fields. */
+ uint16_t bytes_per_line;
+ uint16_t width;
+ uint16_t height;
+ uint8_t cell_width;
+ uint8_t cell_height;
+ uint8_t nr_planes;
+ uint8_t depth;
+ uint8_t memory[5]; /* We don't use the individual fields. */
+ struct boot_video_colors colors;
+ uint8_t direct_color;
+ uint32_t base;
+ /* We don't use any further fields. */
+};
+#endif /* CONFIG_VIDEO */
+
#define get_mb2_data(tag, type, member) (((multiboot2_tag_##type##_t
*)(tag))->member)
#define get_mb2_string(tag, type, member) ((u32)get_mb2_data(tag, type,
member))
@@ -146,7 +180,7 @@ static multiboot_info_t *mbi_reloc(u32 mbi_in)
return mbi_out;
}
-static multiboot_info_t *mbi2_reloc(u32 mbi_in)
+static multiboot_info_t *mbi2_reloc(uint32_t mbi_in, uint32_t video_out)
{
const multiboot2_fixed_t *mbi_fix = _p(mbi_in);
const multiboot2_memory_map_t *mmap_src;
@@ -154,6 +188,9 @@ static multiboot_info_t *mbi2_reloc(u32 mbi_in)
module_t *mbi_out_mods = NULL;
memory_map_t *mmap_dst;
multiboot_info_t *mbi_out;
+#ifdef CONFIG_VIDEO
+ struct boot_video_info *video = NULL;
+#endif
u32 ptr;
unsigned int i, mod_idx = 0;
@@ -254,17 +291,64 @@ static multiboot_info_t *mbi2_reloc(u32 mbi_in)
++mod_idx;
break;
+#ifdef CONFIG_VIDEO
+ case MULTIBOOT2_TAG_TYPE_VBE:
+ if ( video_out )
+ {
+ const struct vesa_ctrl_info *ci;
+ const struct vesa_mode_info *mi;
+
+ video = _p(video_out);
+ ci = (void *)get_mb2_data(tag, vbe, vbe_control_info);
+ mi = (void *)get_mb2_data(tag, vbe, vbe_mode_info);
+
+ if ( ci->version >= 0x0200 && (mi->attrib & 0x9b) == 0x9b )
+ {
+ video->capabilities = ci->capabilities;
+ video->lfb_linelength = mi->bytes_per_line;
+ video->lfb_width = mi->width;
+ video->lfb_height = mi->height;
+ video->lfb_depth = mi->depth;
+ video->lfb_base = mi->base;
+ video->lfb_size = ci->mem_size;
+ video->colors = mi->colors;
+ video->vesa_attrib = mi->attrib;
+ }
+
+ video->vesapm.seg = get_mb2_data(tag, vbe, vbe_interface_seg);
+ video->vesapm.off = get_mb2_data(tag, vbe, vbe_interface_off);
+ }
+ break;
+
+ case MULTIBOOT2_TAG_TYPE_FRAMEBUFFER:
+ if ( (get_mb2_data(tag, framebuffer, framebuffer_type) !=
+ MULTIBOOT2_FRAMEBUFFER_TYPE_RGB) )
+ {
+ video_out = 0;
+ video = NULL;
+ }
+ break;
+#endif /* CONFIG_VIDEO */
+
case MULTIBOOT2_TAG_TYPE_END:
- return mbi_out;
+ goto end; /* Cannot "break;" here. */
default:
break;
}
+ end:
+
+#ifdef CONFIG_VIDEO
+ if ( video )
+ video->orig_video_isVGA = 0x23;
+#endif
+
return mbi_out;
}
-void * __stdcall reloc(u32 magic, u32 in, u32 trampoline)
+void *__stdcall reloc(uint32_t magic, uint32_t in, uint32_t trampoline,
+ uint32_t video_info)
{
alloc = trampoline;
@@ -274,7 +358,7 @@ void * __stdcall reloc(u32 magic, u32 in, u32 trampoline)
return mbi_reloc(in);
case MULTIBOOT2_BOOTLOADER_MAGIC:
- return mbi2_reloc(in);
+ return mbi2_reloc(in, video_info);
case XEN_HVM_START_MAGIC_VALUE:
if ( IS_ENABLED(CONFIG_PVH_GUEST) )
diff --git a/xen/arch/x86/boot/video.h b/xen/arch/x86/boot/video.h
index 4026954196..6a7775d242 100644
--- a/xen/arch/x86/boot/video.h
+++ b/xen/arch/x86/boot/video.h
@@ -28,4 +28,45 @@
/* The "recalculate timings" flag */
#define VIDEO_RECALC 0x8000
+#ifndef __ASSEMBLY__
+struct boot_video_info {
+ uint8_t orig_x; /* 0x00 */
+ uint8_t orig_y; /* 0x01 */
+ uint8_t orig_video_mode; /* 0x02 */
+ uint8_t orig_video_cols; /* 0x03 */
+ uint8_t orig_video_lines; /* 0x04 */
+ uint8_t orig_video_isVGA; /* 0x05 */
+ uint16_t orig_video_points; /* 0x06 */
+
+ /* VESA graphic mode -- linear frame buffer */
+ uint32_t capabilities; /* 0x08 */
+ uint16_t lfb_linelength; /* 0x0c */
+ uint16_t lfb_width; /* 0x0e */
+ uint16_t lfb_height; /* 0x10 */
+ uint16_t lfb_depth; /* 0x12 */
+ uint32_t lfb_base; /* 0x14 */
+ uint32_t lfb_size; /* 0x18 */
+ union {
+ struct {
+ uint8_t red_size; /* 0x1c */
+ uint8_t red_pos; /* 0x1d */
+ uint8_t green_size; /* 0x1e */
+ uint8_t green_pos; /* 0x1f */
+ uint8_t blue_size; /* 0x20 */
+ uint8_t blue_pos; /* 0x21 */
+ uint8_t rsvd_size; /* 0x22 */
+ uint8_t rsvd_pos; /* 0x23 */
+ };
+ struct boot_video_colors {
+ uint8_t rgbr[8];
+ } colors;
+ };
+ struct {
+ uint16_t seg; /* 0x24 */
+ uint16_t off; /* 0x26 */
+ } vesapm;
+ uint16_t vesa_attrib; /* 0x28 */
+};
+#endif /* __ASSEMBLY__ */
+
#endif /* __BOOT_VIDEO_H__ */
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index a0ee8d206f..6f20e17892 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -532,35 +532,7 @@ static void __init setup_max_pdx(unsigned long top_page)
static struct e820map __initdata boot_e820;
#ifdef CONFIG_VIDEO
-struct boot_video_info {
- u8 orig_x; /* 0x00 */
- u8 orig_y; /* 0x01 */
- u8 orig_video_mode; /* 0x02 */
- u8 orig_video_cols; /* 0x03 */
- u8 orig_video_lines; /* 0x04 */
- u8 orig_video_isVGA; /* 0x05 */
- u16 orig_video_points; /* 0x06 */
-
- /* VESA graphic mode -- linear frame buffer */
- u32 capabilities; /* 0x08 */
- u16 lfb_linelength; /* 0x0c */
- u16 lfb_width; /* 0x0e */
- u16 lfb_height; /* 0x10 */
- u16 lfb_depth; /* 0x12 */
- u32 lfb_base; /* 0x14 */
- u32 lfb_size; /* 0x18 */
- u8 red_size; /* 0x1c */
- u8 red_pos; /* 0x1d */
- u8 green_size; /* 0x1e */
- u8 green_pos; /* 0x1f */
- u8 blue_size; /* 0x20 */
- u8 blue_pos; /* 0x21 */
- u8 rsvd_size; /* 0x22 */
- u8 rsvd_pos; /* 0x23 */
- u16 vesapm_seg; /* 0x24 */
- u16 vesapm_off; /* 0x26 */
- u16 vesa_attrib; /* 0x28 */
-};
+# include "boot/video.h"
extern struct boot_video_info boot_vid_info;
#endif
diff --git a/xen/include/xen/multiboot2.h b/xen/include/xen/multiboot2.h
index 5acd225044..f792040205 100644
--- a/xen/include/xen/multiboot2.h
+++ b/xen/include/xen/multiboot2.h
@@ -158,6 +158,59 @@ typedef struct {
multiboot2_memory_map_t entries[];
} multiboot2_tag_mmap_t;
+typedef struct
+{
+ uint32_t type;
+ uint32_t size;
+ uint16_t vbe_mode;
+ uint16_t vbe_interface_seg;
+ uint16_t vbe_interface_off;
+ uint16_t vbe_interface_len;
+ uint8_t vbe_control_info[512];
+ uint8_t vbe_mode_info[256];
+} multiboot2_tag_vbe_t;
+
+typedef struct
+{
+ uint8_t red;
+ uint8_t green;
+ uint8_t blue;
+} multiboot2_color_t;
+
+typedef struct
+{
+ uint32_t type;
+ uint32_t size;
+ uint64_t framebuffer_addr;
+ uint32_t framebuffer_pitch;
+ uint32_t framebuffer_width;
+ uint32_t framebuffer_height;
+ uint8_t framebuffer_bpp;
+#define MULTIBOOT2_FRAMEBUFFER_TYPE_INDEXED 0
+#define MULTIBOOT2_FRAMEBUFFER_TYPE_RGB 1
+#define MULTIBOOT2_FRAMEBUFFER_TYPE_EGA_TEXT 2
+ uint8_t framebuffer_type;
+ uint16_t reserved;
+
+ union
+ {
+ struct
+ {
+ uint16_t framebuffer_palette_num_colors;
+ multiboot2_color_t framebuffer_palette[];
+ };
+ struct
+ {
+ uint8_t framebuffer_red_field_position;
+ uint8_t framebuffer_red_mask_size;
+ uint8_t framebuffer_green_field_position;
+ uint8_t framebuffer_green_mask_size;
+ uint8_t framebuffer_blue_field_position;
+ uint8_t framebuffer_blue_mask_size;
+ };
+ };
+} multiboot2_tag_framebuffer_t;
+
typedef struct {
u32 type;
u32 size;
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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