Identity-map complete vga region (0xa0000 to 0xc0000) #104
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phil-opp
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Mar 14, 2020
Co-Authored-By: Philipp Oppermann <dev@phil-opp.com>
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Makes sense to me since technically 0xbffff is included in the final map. I added your suggestion. |
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Published as version 0.9.0 |
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I took the existing method from vga_320x200 and extended it to map through 0xbffff. I also added it in vga_80x25 so that regions are mapped regardless of which feature someone uses. Let me know if anything looks off.
Edit (phil-opp): This PR extends the identity-mapping that we do for the VGA buffer at address 0xb8000 (or 0xa0000 with the vga_320x200) feature to all addresses in the range 0xa0000 to 0xc0000. This simplifies the switch to different VGA modes on the kernel side (see #99). This is a breaking change because it breaks kernels that try to map these virtual addresses themselves.