From 1c4c7f88056f50987a5a4d40016d6e32dc5a0205 Mon Sep 17 00:00:00 2001 From: sigsegv7 Date: Wed, 11 Oct 2023 16:39:05 -0400 Subject: kernel: vm: Add PMAP abstraction Signed-off-by: sigsegv7 --- sys/arch/amd64/pmap.c | 50 ++++++++++++++++++++++++++++++++++++++++ sys/include/arch/amd64/vas.h | 43 +++++++++++++++++++++++++++++++++++ sys/include/vm/pmap.h | 54 ++++++++++++++++++++++++++++++++++++++++++++ sys/include/vm/vm.h | 2 +- 4 files changed, 148 insertions(+), 1 deletion(-) create mode 100644 sys/arch/amd64/pmap.c create mode 100644 sys/include/arch/amd64/vas.h create mode 100644 sys/include/vm/pmap.h (limited to 'sys') diff --git a/sys/arch/amd64/pmap.c b/sys/arch/amd64/pmap.c new file mode 100644 index 0000000..0da80d9 --- /dev/null +++ b/sys/arch/amd64/pmap.c @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include + +#define PTE_ADDR_MASK 0x000FFFFFFFFFF000 + +struct vas +pmap_read_vas(void) +{ + struct vas vas; + uintptr_t cr3_raw; + + __ASMV("mov %%cr3, %0" + : "=r" (cr3_raw) + ); + + vas.cr3_flags = cr3_raw & ~PTE_ADDR_MASK; + vas.top_level = cr3_raw & PTE_ADDR_MASK; + vas.use_l5_paging = false; /* TODO: Check for support */ + vas.lock.lock = 0; + return vas; +} diff --git a/sys/include/arch/amd64/vas.h b/sys/include/arch/amd64/vas.h new file mode 100644 index 0000000..8284e8f --- /dev/null +++ b/sys/include/arch/amd64/vas.h @@ -0,0 +1,43 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _AMD64_PMAP_H_ +#define _AMD64_PMAP_H_ + +#include +#include + +struct vas { + size_t cr3_flags; /* CR3 flags */ + uintptr_t top_level; /* PML5 if `use_l5_paging' true, otherwise PML4 */ + bool use_l5_paging; /* True if 5-level paging is supported */ + struct spinlock lock; +}; + +#endif /* !_AMD64_PMAP_H_ */ diff --git a/sys/include/vm/pmap.h b/sys/include/vm/pmap.h new file mode 100644 index 0000000..8dd6b7d --- /dev/null +++ b/sys/include/vm/pmap.h @@ -0,0 +1,54 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _VM_PMAP_H_ +#define _VM_PMAP_H_ + +/* + * Each architecture is expected to implement + * this header. It should contain a `struct vas' + * which will contain information about a VAS + * (virtual address space) + * + * On AMD64 this struct contains: PML4, etc + * + * XXX: Compiler errors pointing to this include means you + * forgot to implement it!!! + * + * `struct vas' MUST have a `struct spinlock lock' field!!! + */ +#include + +/* + * Read virtual address space descriptor + * and return it. + */ +struct vas pmap_read_vas(void); + +#endif /* _VM_PMAP_H_ */ diff --git a/sys/include/vm/vm.h b/sys/include/vm/vm.h index baf7677..e238cd0 100644 --- a/sys/include/vm/vm.h +++ b/sys/include/vm/vm.h @@ -34,6 +34,7 @@ #include #include #include +#include extern volatile struct limine_hhdm_request g_hhdm_request; @@ -55,6 +56,5 @@ vm_get_page_size(void) } void vm_init(void); -struct vas vm_new_vas(void); #endif /* !_VM_H_ */ -- cgit v1.2.3