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kern: simplify size calculations in KPageTableBase::Read/WriteDebugIoMemory

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This commit is contained in:
Michael Scire 2024-03-28 02:22:19 -07:00
parent 4aac5f0082
commit cfb12deb51
1 changed files with 2 additions and 2 deletions
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4
libraries/libmesosphere/source/kern_k_page_table_base.cpp
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@ -2994,7 +2994,7 @@ namespace ams::kern {
MESOSPHERE_ABORT_UNLESS(src_page_table.GetPhysicalAddressLocked(std::addressof(phys_addr), address)); MESOSPHERE_ABORT_UNLESS(src_page_table.GetPhysicalAddressLocked(std::addressof(phys_addr), address));
/* Determine the current read size. */ /* Determine the current read size. */
const size_t cur_size = std::min<size_t>(last_address - address + 1, util::AlignDown(GetInteger(address) + PageSize, PageSize) - GetInteger(address)); const size_t cur_size = std::min<size_t>(last_address - address + 1, PageSize - (GetInteger(address) & (PageSize - 1)));
/* Read. */ /* Read. */
R_TRY(dst_page_table.ReadIoMemoryImpl(dst, phys_addr, cur_size, state)); R_TRY(dst_page_table.ReadIoMemoryImpl(dst, phys_addr, cur_size, state));
@ -3030,7 +3030,7 @@ namespace ams::kern {
MESOSPHERE_ABORT_UNLESS(src_page_table.GetPhysicalAddressLocked(std::addressof(phys_addr), address)); MESOSPHERE_ABORT_UNLESS(src_page_table.GetPhysicalAddressLocked(std::addressof(phys_addr), address));
/* Determine the current read size. */ /* Determine the current read size. */
const size_t cur_size = std::min<size_t>(last_address - address + 1, util::AlignDown(GetInteger(address) + PageSize, PageSize) - GetInteger(address)); const size_t cur_size = std::min<size_t>(last_address - address + 1, PageSize - (GetInteger(address) & (PageSize - 1)));
/* Read. */ /* Read. */
R_TRY(dst_page_table.WriteIoMemoryImpl(phys_addr, src, cur_size, state)); R_TRY(dst_page_table.WriteIoMemoryImpl(phys_addr, src, cur_size, state));