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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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2
Kernel/Interrupts/APIC.cpp
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@@ -309,7 +309,7 @@ void APIC::do_boot_aps()
// Also account for the data appended to:
// * aps_to_enable u32 values for ap_cpu_init_stacks
// * aps_to_enable u32 values for ap_cpu_init_processor_info_array
auto apic_startup_region = MM.allocate_kernel_region_identity(PhysicalAddress(0x8000), PAGE_ROUND_UP(apic_ap_start_size + (2 * aps_to_enable * sizeof(u32))), {}, Region::Access::Read | Region::Access::Write | Region::Access::Execute);
auto apic_startup_region = MM.allocate_kernel_region_identity(PhysicalAddress(0x8000), page_round_up(apic_ap_start_size + (2 * aps_to_enable * sizeof(u32))), {}, Region::Access::Read | Region::Access::Write | Region::Access::Execute);
memcpy(apic_startup_region->vaddr().as_ptr(), reinterpret_cast<const void*>(apic_ap_start), apic_ap_start_size);
// Allocate enough stacks for all APs