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Kernel: Assert if rounding-up-to-page-size would wrap around to 0

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If we try to align a number above 0xfffff000 to the next multiple of
the page size (4 KiB), it would wrap around to 0. This is most likely
never what we want, so let's assert if that happens.
This commit is contained in:
Andreas Kling
2021-02-14 09:57:19 +01:00
parent 198d641808
commit 09b1b09c19
19 changed files with 67 additions and 40 deletions
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4
Kernel/Arch/PC/BIOS.cpp
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@@ -36,7 +36,7 @@ MappedROM map_bios()
MappedROM mapping;
mapping.size = 128 * KiB;
mapping.paddr = PhysicalAddress(0xe0000);
mapping.region = MM.allocate_kernel_region(mapping.paddr, PAGE_ROUND_UP(mapping.size), {}, Region::Access::Read);
mapping.region = MM.allocate_kernel_region(mapping.paddr, page_round_up(mapping.size), {}, Region::Access::Read);
return mapping;
}
@@ -49,7 +49,7 @@ MappedROM map_ebda()
size_t ebda_size = *ebda_length_ptr;
MappedROM mapping;
mapping.region = MM.allocate_kernel_region(ebda_paddr.page_base(), PAGE_ROUND_UP(ebda_size), {}, Region::Access::Read);
mapping.region = MM.allocate_kernel_region(ebda_paddr.page_base(), page_round_up(ebda_size), {}, Region::Access::Read);
mapping.offset = ebda_paddr.offset_in_page();
mapping.size = ebda_size;
mapping.paddr = ebda_paddr;