Map BIOS stage-4 at lower address to avoid conflicts with the kernel#337
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Map BIOS stage-4 at lower address to avoid conflicts with the kernel#337
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Parts of stage-4 need to be identity-mapped. This can lead to 'page already mapped' errors when the kernel already occupies the virtual address corresponding to the physical address of the stage-4. For example, a typical virtual start address of the kernel is 2MiB. This was where we placed the stage-4 in physical memory before. This commit avoids that conflict by keeping the stage-4 below the 2MiB boundary.
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Parts of stage-4 need to be identity-mapped. This can lead to 'page already mapped' errors when the kernel already occupies the virtual address corresponding to the physical address of the stage-4. For example, a typical virtual start address of the kernel is 2MiB. This was where we placed the stage-4 in physical memory before. This commit avoids that conflict by keeping the stage-4 below the 2MiB boundary.
Fixes #331