linux_trampoline: Handle coreboot framebuffer
Translate the coreboot framebuffer info from coreboot tables to the Linux zero page. Tested in QEMU/Q35 with a kernel w/ efifb enabled. Change-Id: I2447b2366df8dd8ffe741c943de544d8b4d02dff Signed-off-by: Nico Huber <nico.h@gmx.de> Co-authored-by: Bill XIE <persmule@hardenedlinux.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/76431 Reviewed-by: Paul Menzel <paulepanter@mailbox.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com> Reviewed-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Bill XIE <persmule@hardenedlinux.org>
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@ -102,7 +102,36 @@ jmp .endScan
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.testFramebuffer:
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.testFramebuffer:
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cmp $CB_TAG_FRAMEBUFFER, (%ebx)
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cmp $CB_TAG_FRAMEBUFFER, (%ebx)
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jne .endScan
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jne .endScan
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/* TODO: handle framebuffer tag */
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cmpl $0, 0x0c(%ebx) /* check if upper 32-bit of framebuffer address are 0 */
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jne .endScan
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mov $LINUX_PARAM_LOC, %edi /* translate the framebuffer entry into Linux' struct screen_info */
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mov 0x08(%ebx), %eax /* physical_address */
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mov %eax, 0x18(%edi) /* -> lfb_base */
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mov 0x10(%ebx), %eax /* x_resolution */
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mov %ax, 0x12(%edi) /* -> lfb_width */
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mov 0x14(%ebx), %eax /* y_resolution */
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mov %ax, 0x14(%edi) /* -> lfb_height */
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mov 0x18(%ebx), %edx /* bytes_per_line */
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mov %dx, 0x24(%edi) /* -> lfb_linelength */
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mul %edx /* bytes_per_line * y_resolution */
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mov %eax, 0x1c(%edi) /* -> lfb_size */
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movzbw 0x1c(%ebx), %ax /* bits_per_pixel */
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mov %ax, 0x16(%edi) /* -> lfb_depth */
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mov $4, %esi /* Copy 4 color components' pos and size, each 1 byte. */
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1:
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mov 0x1b(%ebx, %esi, 2), %ax
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rol %ax /* Order is reversed for Linux, hence swap. */
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mov %ax, 0x24(%edi, %esi, 2)
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dec %esi
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jnz 1b
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#define LFB_EFI_SIMPLE 0x70 /* VIDEO_TYPE_EFI in Linux */
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movb $LFB_EFI_SIMPLE, 0x0f(%edi) /* -> orig_video_isVGA */
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.endScan:
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.endScan:
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add 4(%ebx), %ebx
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add 4(%ebx), %ebx
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@ -3,18 +3,23 @@
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unsigned char trampoline[] = {
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unsigned char trampoline[] = {
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0xfc, 0x31, 0xd2, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb, 0x00, 0x00, 0x01, 0x00, 0x01, 0xcb, 0x8b,
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0xfc, 0x31, 0xd2, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb, 0x00, 0x00, 0x01, 0x00, 0x01, 0xcb, 0x8b,
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0x01, 0x3d, 0x4c, 0x42, 0x49, 0x4f, 0x74, 0x07, 0x83, 0xc1, 0x10, 0x39, 0xcb, 0x75, 0xe9, 0x39,
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0x01, 0x3d, 0x4c, 0x42, 0x49, 0x4f, 0x74, 0x07, 0x83, 0xc1, 0x10, 0x39, 0xcb, 0x75, 0xe9, 0x39,
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0xcb, 0x0f, 0x84, 0xc5, 0x00, 0x00, 0x00, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83,
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0xcb, 0x0f, 0x84, 0x12, 0x01, 0x00, 0x00, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83,
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0x3b, 0x11, 0x75, 0x05, 0x8b, 0x4b, 0x08, 0xeb, 0xcf, 0x83, 0x3b, 0x01, 0x75, 0x53, 0x8b, 0x43,
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0x3b, 0x11, 0x75, 0x05, 0x8b, 0x4b, 0x08, 0xeb, 0xcf, 0x83, 0x3b, 0x01, 0x75, 0x53, 0x8b, 0x43,
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0x04, 0x83, 0xe8, 0x08, 0xc1, 0xe8, 0x02, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0xa0,
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0x04, 0x83, 0xe8, 0x08, 0xc1, 0xe8, 0x02, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0xa0,
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0x00, 0x00, 0x00, 0x89, 0xc6, 0xbf, 0x05, 0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09,
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0x00, 0x00, 0x00, 0x89, 0xc6, 0xbf, 0x05, 0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09,
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0x00, 0x89, 0xf0, 0x91, 0x8d, 0x73, 0x08, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xa1,
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0x00, 0x89, 0xf0, 0x91, 0x8d, 0x73, 0x08, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xa1,
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0xe8, 0x01, 0x09, 0x00, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0x83, 0xf8, 0x00, 0x74, 0x2f, 0x83, 0x7f,
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0xe8, 0x01, 0x09, 0x00, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0x83, 0xf8, 0x00, 0x74, 0x7c, 0x83, 0x7f,
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0x10, 0x0c, 0x7e, 0x07, 0xc7, 0x47, 0x10, 0x02, 0x00, 0x00, 0x00, 0x48, 0x83, 0xc7, 0x14, 0xeb,
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0x10, 0x0c, 0x7e, 0x07, 0xc7, 0x47, 0x10, 0x02, 0x00, 0x00, 0x00, 0x48, 0x83, 0xc7, 0x14, 0xeb,
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0xe8, 0x83, 0x3b, 0x43, 0x75, 0x12, 0x8b, 0x43, 0x08, 0xa3, 0x70, 0x00, 0x09, 0x00, 0x8b, 0x43,
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0xe8, 0x83, 0x3b, 0x43, 0x75, 0x12, 0x8b, 0x43, 0x08, 0xa3, 0x70, 0x00, 0x09, 0x00, 0x8b, 0x43,
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0x0c, 0xa3, 0x74, 0x00, 0x09, 0x00, 0xeb, 0x05, 0x83, 0x3b, 0x12, 0x75, 0x00, 0x03, 0x5b, 0x04,
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0x0c, 0xa3, 0x74, 0x00, 0x09, 0x00, 0xeb, 0x52, 0x83, 0x3b, 0x12, 0x75, 0x4d, 0x83, 0x7b, 0x0c,
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0x49, 0x0f, 0x85, 0x78, 0xff, 0xff, 0xff, 0xb8, 0x00, 0x00, 0x04, 0x00, 0xc7, 0x40, 0x10, 0xff,
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0x00, 0x75, 0x47, 0xbf, 0x00, 0x00, 0x09, 0x00, 0x8b, 0x43, 0x08, 0x89, 0x47, 0x18, 0x8b, 0x43,
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0xff, 0x00, 0x00, 0xc7, 0x40, 0x14, 0x00, 0x9b, 0xcf, 0x00, 0xc7, 0x40, 0x18, 0xff, 0xff, 0x00,
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0x10, 0x66, 0x89, 0x47, 0x12, 0x8b, 0x43, 0x14, 0x66, 0x89, 0x47, 0x14, 0x8b, 0x53, 0x18, 0x66,
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0x00, 0xc7, 0x40, 0x1c, 0x00, 0x93, 0xcf, 0x00, 0xc6, 0x00, 0x2b, 0x89, 0x40, 0x02, 0x0f, 0x01,
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0x89, 0x57, 0x24, 0xf7, 0xe2, 0x89, 0x47, 0x1c, 0x66, 0x0f, 0xb6, 0x43, 0x1c, 0x66, 0x89, 0x47,
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0x10, 0xbe, 0x00, 0x00, 0x09, 0x00, 0xff, 0x25, 0x14, 0x02, 0x09, 0x00, 0xf4, 0xeb, 0xfd
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0x16, 0xbe, 0x04, 0x00, 0x00, 0x00, 0x66, 0x8b, 0x44, 0x73, 0x1b, 0x66, 0xd1, 0xc0, 0x66, 0x89,
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0x44, 0x77, 0x24, 0x4e, 0x75, 0xf0, 0xc6, 0x47, 0x0f, 0x70, 0x03, 0x5b, 0x04, 0x49, 0x0f, 0x85,
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0x2b, 0xff, 0xff, 0xff, 0xb8, 0x00, 0x00, 0x04, 0x00, 0xc7, 0x40, 0x10, 0xff, 0xff, 0x00, 0x00,
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0xc7, 0x40, 0x14, 0x00, 0x9b, 0xcf, 0x00, 0xc7, 0x40, 0x18, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x40,
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0x1c, 0x00, 0x93, 0xcf, 0x00, 0xc6, 0x00, 0x2b, 0x89, 0x40, 0x02, 0x0f, 0x01, 0x10, 0xbe, 0x00,
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0x00, 0x09, 0x00, 0xff, 0x25, 0x14, 0x02, 0x09, 0x00, 0xf4, 0xeb, 0xfd
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};
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};
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unsigned int trampoline_len = 239;
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unsigned int trampoline_len = 316;
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