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A free Windows-compatible Operating System - mirrored from GitHub
0b44376e27
- Implemented and defined the MMU-OS architecture for the ARM port. The details are too long for a commit message, but we have decided to replicate the x86 NT memory manager layout. We've defined a PTE_BASE at 0xC0000000 just like on x86, and we use a PDE_BASE at 0xC1000000. Unlike the x86, we can't use PDE-PTE self-mapping because ARM has different formats (and sizes!) for PDE vs PTEs! We emulate the behavior however (which adds a small performance hit) and the Mm porting is thus at least 10 times easier. - Moved serial port to 0xE0000000 for now. - We now parse the board memory map from u-boot. - Added memory allocation code to FreeLDR -- we now build a full ARC memory map for the kernel. - FreeLDR allocates page tables and sets up the initial support for our memory layout (see comments for some lengthier explenations) - Allocations made by FreeLDR for loading ReactOS are now made from a "shared heap" page that's also marked in the memory map. - Registry and NLS data are now being put into the loader block. - We now create a loader entry for the kernel (but not anything else -- we'll have to parse the list properly later). - Defined correct _HARDWARE_PTE_ARM and _MMPTE_HARDWARE for ARM. - ARM_COARSE_PAGE_TABLE is now 4KB instead of 1KB, going against the architecture! We do this for proper OS support of the PTE_BASE. - Fixed build due to KiSystemStartulReal change. - Fixed a bug on the x86 build when creating memory allocation descriptors. Memory corruption could occur in certain scenarios. - Implemented significant portions of the ARM memory manager code in the kernel: - MmGetPageDirectory. - MmDeletePageTable (for the kernel address space only). - MmIsPagePresent (for the kernel address space only). - MmCreateVirtualMappingForKernel. - MmCreateVirtualMapping (calls MmCreateVirtualMappingUnsafe). - MmCreateVirtualMappingUnsafe (for the kernel address space only). - MmSetPageProtect (unused on ARM). - MmCreateHyperspaceMapping. - MmDeleteHyperspaceMapping. - MmInitGlobalKernelPageDirectory. - MmInitPageDirectoryMap. - With the above, this means we now go well inside MmInit1: the PFN database is setup and works, memory areas are functional, and non-paged pool is fully working. - We currently hit a data abort during paged pool setup -- this is to be expected, since we don't have any exception handlers yet. These are coming up next -- we have to start handling crashes (and page faults). svn path=/trunk/; revision=32640 |
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