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Kernel: Fail xHCI initialization if page size != 4096 

Also zero out scratchapd buffers as the spec says
This commit is contained in:
Bananymous 2025-11-14 19:54:58 +02:00
parent 2dd8b76289
commit f166cb09ec
1 changed files with 15 additions and 0 deletions
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15
kernel/kernel/USB/XHCI/Controller.cpp
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@ -113,6 +113,18 @@ namespace Kernel
auto& operational = operational_regs();
if (auto page_size_bits = operational.pagesize & 0xFFFF; page_size_bits != 1)
{
dwarnln("XHCI does not support 4096 byte pages");
dwarnln(" supported page sizes:");
for (size_t i = 0; i < 16; i++)
if (page_size_bits & (1 << i))
dwarnln(" {} bytes", 1 << (12 + i));
if (__builtin_popcount(page_size_bits) != 1)
dwarnln(" ... XHCI spec only allows a single supported page size???");
return BAN::Error::from_errno(ENOTSUP);
}
// allocate and program dcbaa
m_dcbaa_region = TRY(DMARegion::create(capabilities.hcsparams1.max_slots * 8));
memset(reinterpret_cast<void*>(m_dcbaa_region->vaddr()), 0, m_dcbaa_region->size());
@ -289,6 +301,9 @@ namespace Kernel
const paddr_t paddr = Heap::get().take_free_page();
if (paddr == 0)
return BAN::Error::from_errno(ENOMEM);
PageTable::with_fast_page(paddr, [] {
memset(PageTable::fast_page_as_ptr(), 0, PAGE_SIZE);
});
m_scratchpad_buffers[i] = paddr;
scratchpad_buffer_array[i] = paddr;
}