Request a framebuffer in the multiboot2 header and record any
available frame buffer in the boot_info.
---
i386/i386/multiboot2_hdr_asm.h | 9 +++++++++
i386/i386at/model_dep.c | 17 +++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/i386/i386/multiboot2_hdr_asm.h b/i386/i386/multiboot2_hdr_asm.h
index b2ecb21c..ccb2a448 100644
--- a/i386/i386/multiboot2_hdr_asm.h
+++ b/i386/i386/multiboot2_hdr_asm.h
@@ -42,6 +42,15 @@ multiboot2_hdr:
.short MULTIBOOT2_HEADER_TAG_MODULE_ALIGN
.short 0
.long 8
+ /* Frame buffer specified with no preference for width, height
+ and depth. */
+ .short MULTIBOOT2_HEADER_TAG_FRAMEBUFFER
+ .short 0
+ .long 20
+ .long 0 /* No preference. */
+ .long 0 /* No preference. */
+ .long 0 /* No preference. */
+ .long 0 /* Padding */
/* There must always be an 'end' (empty) tag */
.short MULTIBOOT2_HEADER_TAG_END
.short 0
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c
index be4f737b..ffbfa2d4 100644
--- a/i386/i386at/model_dep.c
+++ b/i386/i386at/model_dep.c
@@ -644,6 +644,23 @@ finalise_mb2_boot_info(const struct multiboot2_raw_info
*mb2_info)
}
break;
+ case MULTIBOOT2_TAG_TYPE_FRAMEBUFFER:
+ {
+ const struct multiboot2_tag_framebuffer *fb_tag =
+ (const struct multiboot2_tag_framebuffer *)tag;
+
+ boot_info.fb_info.framebuffer_addr =
fb_tag->common.framebuffer_addr;
+ boot_info.fb_info.framebuffer_pitch =
fb_tag->common.framebuffer_pitch;
+ boot_info.fb_info.framebuffer_width =
fb_tag->common.framebuffer_width;
+ boot_info.fb_info.framebuffer_height =
fb_tag->common.framebuffer_height;
+ boot_info.fb_info.framebuffer_bpp = fb_tag->common.framebuffer_bpp;
+ /* framebuffer_type values are the same in mb1 and mb2. */
+ boot_info.fb_info.framebuffer_type =
fb_tag->common.framebuffer_type;
+
+ boot_info.flags |= MULTIBOOT_FRAMEBUFFER;
+ }
+ break;
+
default:
break;
}
--
2.47.3
