From 6d2734a074f44a24129db850339677d8d7b436aa Mon Sep 17 00:00:00 2001 From: Subv Date: Fri, 21 Jul 2017 21:17:57 -0500 Subject: Kernel/Memory: Give each Process its own page table. The loader is in charge of setting the newly created process's page table as the main one during the loading process. --- src/core/memory.cpp | 87 ++++++++--------------------------------------------- 1 file changed, 12 insertions(+), 75 deletions(-) (limited to 'src/core/memory.cpp') diff --git a/src/core/memory.cpp b/src/core/memory.cpp index 65649d9d7..ea46b6ead 100644 --- a/src/core/memory.cpp +++ b/src/core/memory.cpp @@ -11,75 +11,18 @@ #include "core/hle/kernel/process.h" #include "core/memory.h" #include "core/memory_setup.h" -#include "core/mmio.h" #include "video_core/renderer_base.h" #include "video_core/video_core.h" namespace Memory { -enum class PageType { - /// Page is unmapped and should cause an access error. - Unmapped, - /// Page is mapped to regular memory. This is the only type you can get pointers to. - Memory, - /// Page is mapped to regular memory, but also needs to check for rasterizer cache flushing and - /// invalidation - RasterizerCachedMemory, - /// Page is mapped to a I/O region. Writing and reading to this page is handled by functions. - Special, - /// Page is mapped to a I/O region, but also needs to check for rasterizer cache flushing and - /// invalidation - RasterizerCachedSpecial, -}; - -struct SpecialRegion { - VAddr base; - u32 size; - MMIORegionPointer handler; -}; - -/** - * A (reasonably) fast way of allowing switchable and remappable process address spaces. It loosely - * mimics the way a real CPU page table works, but instead is optimized for minimal decoding and - * fetching requirements when accessing. In the usual case of an access to regular memory, it only - * requires an indexed fetch and a check for NULL. - */ -struct PageTable { - /** - * Array of memory pointers backing each page. An entry can only be non-null if the - * corresponding entry in the `attributes` array is of type `Memory`. - */ - std::array pointers; - - /** - * Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of - * type `Special`. - */ - std::vector special_regions; - - /** - * Array of fine grained page attributes. If it is set to any value other than `Memory`, then - * the corresponding entry in `pointers` MUST be set to null. - */ - std::array attributes; - - /** - * Indicates the number of externally cached resources touching a page that should be - * flushed before the memory is accessed - */ - std::array cached_res_count; -}; - -/// Singular page table used for the singleton process -static PageTable main_page_table; -/// Currently active page table -static PageTable* current_page_table = &main_page_table; +PageTable* current_page_table = nullptr; std::array* GetCurrentPageTablePointers() { return ¤t_page_table->pointers; } -static void MapPages(u32 base, u32 size, u8* memory, PageType type) { +static void MapPages(PageTable& page_table, u32 base, u32 size, u8* memory, PageType type) { LOG_DEBUG(HW_Memory, "Mapping %p onto %08X-%08X", memory, base * PAGE_SIZE, (base + size) * PAGE_SIZE); @@ -90,9 +33,9 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) { while (base != end) { ASSERT_MSG(base < PAGE_TABLE_NUM_ENTRIES, "out of range mapping at %08X", base); - current_page_table->attributes[base] = type; - current_page_table->pointers[base] = memory; - current_page_table->cached_res_count[base] = 0; + page_table.attributes[base] = type; + page_table.pointers[base] = memory; + page_table.cached_res_count[base] = 0; base += 1; if (memory != nullptr) @@ -100,30 +43,24 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) { } } -void InitMemoryMap() { - main_page_table.pointers.fill(nullptr); - main_page_table.attributes.fill(PageType::Unmapped); - main_page_table.cached_res_count.fill(0); -} - -void MapMemoryRegion(VAddr base, u32 size, u8* target) { +void MapMemoryRegion(PageTable& page_table, VAddr base, u32 size, u8* target) { ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size); ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base); - MapPages(base / PAGE_SIZE, size / PAGE_SIZE, target, PageType::Memory); + MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, target, PageType::Memory); } -void MapIoRegion(VAddr base, u32 size, MMIORegionPointer mmio_handler) { +void MapIoRegion(PageTable& page_table, VAddr base, u32 size, MMIORegionPointer mmio_handler) { ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size); ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base); - MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special); + MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special); - current_page_table->special_regions.emplace_back(SpecialRegion{base, size, mmio_handler}); + page_table.special_regions.emplace_back(SpecialRegion{base, size, mmio_handler}); } -void UnmapRegion(VAddr base, u32 size) { +void UnmapRegion(PageTable& page_table, VAddr base, u32 size) { ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size); ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base); - MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped); + MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped); } /** -- cgit v1.2.3 From 214150f00c77474927cbdfb1598dbdb2cb4fcf32 Mon Sep 17 00:00:00 2001 From: Subv Date: Fri, 21 Jul 2017 22:22:59 -0500 Subject: Kernel/Memory: Changed GetPhysicalPointer so that it doesn't go through the current process' page table to obtain a pointer. --- src/core/memory.cpp | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 62 insertions(+), 3 deletions(-) (limited to 'src/core/memory.cpp') diff --git a/src/core/memory.cpp b/src/core/memory.cpp index ea46b6ead..4dcbf2274 100644 --- a/src/core/memory.cpp +++ b/src/core/memory.cpp @@ -4,10 +4,12 @@ #include #include +#include "audio_core/audio_core.h" #include "common/assert.h" #include "common/common_types.h" #include "common/logging/log.h" #include "common/swap.h" +#include "core/hle/kernel/memory.h" #include "core/hle/kernel/process.h" #include "core/memory.h" #include "core/memory_setup.h" @@ -16,6 +18,9 @@ namespace Memory { +static std::array vram; +static std::array n3ds_extra_ram; + PageTable* current_page_table = nullptr; std::array* GetCurrentPageTablePointers() { @@ -236,9 +241,63 @@ std::string ReadCString(VAddr vaddr, std::size_t max_length) { } u8* GetPhysicalPointer(PAddr address) { - // TODO(Subv): This call should not go through the application's memory mapping. - boost::optional vaddr = PhysicalToVirtualAddress(address); - return vaddr ? GetPointer(*vaddr) : nullptr; + struct MemoryArea { + PAddr paddr_base; + u32 size; + }; + + static constexpr MemoryArea memory_areas[] = { + {VRAM_PADDR, VRAM_SIZE}, + {IO_AREA_PADDR, IO_AREA_SIZE}, + {DSP_RAM_PADDR, DSP_RAM_SIZE}, + {FCRAM_PADDR, FCRAM_N3DS_SIZE}, + {N3DS_EXTRA_RAM_PADDR, N3DS_EXTRA_RAM_SIZE}, + }; + + const auto area = + std::find_if(std::begin(memory_areas), std::end(memory_areas), [&](const auto& area) { + return address >= area.paddr_base && address < area.paddr_base + area.size; + }); + + if (area == std::end(memory_areas)) { + LOG_ERROR(HW_Memory, "unknown GetPhysicalPointer @ 0x%08X", address); + return nullptr; + } + + if (area->paddr_base == IO_AREA_PADDR) { + LOG_ERROR(HW_Memory, "MMIO mappings are not supported yet. phys_addr=0x%08X", address); + return nullptr; + } + + u32 offset_into_region = address - area->paddr_base; + + u8* target_pointer = nullptr; + switch (area->paddr_base) { + case VRAM_PADDR: + target_pointer = vram.data() + offset_into_region; + break; + case DSP_RAM_PADDR: + target_pointer = AudioCore::GetDspMemory().data() + offset_into_region; + break; + case FCRAM_PADDR: + for (const auto& region : Kernel::memory_regions) { + if (offset_into_region >= region.base && + offset_into_region < region.base + region.size) { + target_pointer = + region.linear_heap_memory->data() + offset_into_region - region.base; + break; + } + } + ASSERT_MSG(target_pointer != nullptr, "Invalid FCRAM address"); + break; + case N3DS_EXTRA_RAM_PADDR: + target_pointer = n3ds_extra_ram.data() + offset_into_region; + break; + default: + UNREACHABLE(); + } + + return target_pointer; } void RasterizerMarkRegionCached(PAddr start, u32 size, int count_delta) { -- cgit v1.2.3 From f18a176b601c8dc15b372607a4e9f289bdc25ee4 Mon Sep 17 00:00:00 2001 From: Subv Date: Mon, 7 Aug 2017 13:37:16 -0500 Subject: Kernel/Memory: Make IsValidPhysicalAddress not go through the current process' virtual memory mapping. --- src/core/memory.cpp | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'src/core/memory.cpp') diff --git a/src/core/memory.cpp b/src/core/memory.cpp index 4dcbf2274..4d16736f5 100644 --- a/src/core/memory.cpp +++ b/src/core/memory.cpp @@ -208,8 +208,7 @@ bool IsValidVirtualAddress(const VAddr vaddr) { } bool IsValidPhysicalAddress(const PAddr paddr) { - boost::optional vaddr = PhysicalToVirtualAddress(paddr); - return vaddr && IsValidVirtualAddress(*vaddr); + return GetPhysicalPointer(paddr) != nullptr; } u8* GetPointer(const VAddr vaddr) { -- cgit v1.2.3