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kern: implement large page group mapping, fix debug flag cap

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This commit is contained in:
Michael Scire 2020-02-19 22:35:31 -08:00
parent 80b115ef57
commit 9f9593e05f
2 changed files with 115 additions and 2 deletions
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2
libraries/libmesosphere/include/mesosphere/kern_k_capabilities.hpp
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@ -185,7 +185,7 @@ namespace ams::kern {
};
struct DebugFlags {
using IdBits = Field<0, CapabilityId<CapabilityType::HandleTable> + 1>;
using IdBits = Field<0, CapabilityId<CapabilityType::DebugFlags> + 1>;
DEFINE_FIELD(AllowDebug, IdBits, 1, bool);
DEFINE_FIELD(ForceDebug, AllowDebug, 1, bool);

115
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
View file

@ -19,6 +19,68 @@ namespace ams::kern::arch::arm64 {
namespace {
class AlignedMemoryBlock {
private:
uintptr_t before_start;
uintptr_t before_end;
uintptr_t after_start;
uintptr_t after_end;
size_t current_alignment;
public:
constexpr AlignedMemoryBlock(uintptr_t start, size_t num_pages, size_t alignment) : before_start(0), before_end(0), after_start(0), after_end(0), current_alignment(0) {
MESOSPHERE_ASSERT(util::IsAligned(start, PageSize));
MESOSPHERE_ASSERT(num_pages > 0);
/* Find an alignment that allows us to divide into at least two regions.*/
uintptr_t start_page = start / PageSize;
alignment /= PageSize;
while (util::AlignUp(start_page, alignment) >= util::AlignDown(start_page + num_pages, alignment)) {
alignment = KPageTable::GetSmallerAlignment(alignment * PageSize) / PageSize;
}
this->before_start = start_page;
this->before_end = util::AlignUp(start_page, alignment);
this->after_start = this->before_end;
this->after_end = start_page + num_pages;
this->current_alignment = alignment;
MESOSPHERE_ASSERT(this->current_alignment > 0);
}
constexpr void SetAlignment(size_t alignment) {
/* We can only ever decrease the granularity. */
MESOSPHERE_ASSERT(this->current_alignment >= alignment / PageSize);
this->current_alignment = alignment / PageSize;
}
constexpr size_t GetAlignment() const {
return this->current_alignment * PageSize;
}
constexpr void FindBlock(uintptr_t &out, size_t &num_pages) {
if ((this->after_end - this->after_start) >= this->current_alignment) {
/* Select aligned memory from after block. */
const size_t available_pages = util::AlignDown(this->after_end, this->current_alignment) - this->after_start;
if (num_pages == 0 || available_pages < num_pages) {
num_pages = available_pages;
}
out = this->after_start * PageSize;
this->after_start += num_pages;
} else if ((this->before_end - this->before_start) >= this->current_alignment) {
/* Select aligned memory from before block. */
const size_t available_pages = this->before_end - util::AlignUp(this->before_start, this->current_alignment);
if (num_pages == 0 || available_pages < num_pages) {
num_pages = available_pages;
}
this->before_end -= num_pages;
out = this->before_end * PageSize;
} else {
/* Neither after or before can get an aligned bit of memory. */
out = 0;
num_pages = 0;
}
}
};
constexpr u64 EncodeTtbr(KPhysicalAddress table, u8 asid) {
return (static_cast<u64>(asid) << 48) | (static_cast<u64>(GetInteger(table)));
}
@ -565,7 +627,58 @@ namespace ams::kern::arch::arm64 {
mapped_pages += cur_pages;
}
} else {
MESOSPHERE_TODO("Large page group map");
/* Create a block representing our virtual space. */
AlignedMemoryBlock virt_block(GetInteger(virt_addr), num_pages, L1BlockSize);
for (const auto &block : pg) {
/* Create a block representing this physical group, synchronize its alignment to our virtual block. */
const KPhysicalAddress block_phys_addr = GetLinearPhysicalAddress(block.GetAddress());
size_t cur_pages = block.GetNumPages();
AlignedMemoryBlock phys_block(GetInteger(block_phys_addr), cur_pages, virt_block.GetAlignment());
virt_block.SetAlignment(phys_block.GetAlignment());
while (cur_pages > 0) {
/* Find a physical region for us to map at. */
uintptr_t phys_choice = 0;
size_t phys_pages = 0;
phys_block.FindBlock(phys_choice, phys_pages);
/* If we didn't find a region, try decreasing our alignment. */
if (phys_pages == 0) {
const size_t next_alignment = KPageTable::GetSmallerAlignment(phys_block.GetAlignment());
MESOSPHERE_ASSERT(next_alignment >= PageSize);
phys_block.SetAlignment(next_alignment);
virt_block.SetAlignment(next_alignment);
continue;
}
/* Begin choosing virtual blocks to map at the region we chose. */
while (phys_pages > 0) {
/* Find a virtual region for us to map at. */
uintptr_t virt_choice = 0;
size_t virt_pages = phys_pages;
virt_block.FindBlock(virt_choice, virt_pages);
/* If we didn't find a region, try decreasing our alignment. */
if (virt_pages == 0) {
const size_t next_alignment = KPageTable::GetSmallerAlignment(virt_block.GetAlignment());
MESOSPHERE_ASSERT(next_alignment >= PageSize);
phys_block.SetAlignment(next_alignment);
virt_block.SetAlignment(next_alignment);
continue;
}
/* Map! */
R_TRY(this->Map(virt_choice, phys_choice, virt_pages, entry_template, virt_block.GetAlignment(), page_list, reuse_ll));
/* Advance. */
phys_choice += virt_pages * PageSize;
phys_pages -= virt_pages;
cur_pages -= virt_pages;
mapped_pages += virt_pages;
}
}
}
}
/* We successfully mapped, so cancel our guard. */