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Map USB controller registers into the reserved area of virtual memory.

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This ensures they are accessible when the test is running, and if they
are physically mapped above 4GB.
This commit is contained in:
Martin Whitaker
2021-12-23 17:23:28 +00:00
parent 733919966d
commit 9785d8f8b9
4 changed files with 68 additions and 45 deletions
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10
system/screen.c
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@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 Martin Whitaker
// Copyright (C) 2020-2021 Martin Whitaker
#include <stdbool.h>
#include <stdint.h>
@@ -209,7 +209,13 @@ void screen_init(void)
#endif
lfb_stride = screen_info->lfb_linelength;
lfb_base = map_framebuffer(lfb_base, lfb_height * lfb_width * lfb_bytes_per_pixel);
// Clip the framebuffer size to make sure we can map it into the 1GB device region.
// This will produce a garbled display, but that's better than nothing.
if (lfb_width > 16384) lfb_width = 16384;
if (lfb_height > 16384) lfb_height = 16384;
// This is the first device we map, so the above clipping should guarantee it never fails.
lfb_base = map_device(lfb_base, lfb_height * lfb_width * lfb_bytes_per_pixel);
// Blank the whole framebuffer.
int pixels_per_word = sizeof(uint32_t) / lfb_bytes_per_pixel;