/* * Copyright (c) 2016 Martin Decky * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /** @addtogroup kernel_riscv64_mm * @{ */ /** @file */ #include <arch/mm/page.h> #include <genarch/mm/page_pt.h> #include <arch/mm/frame.h> #include <arch/cpu.h> #include <mm/frame.h> #include <mm/page.h> #include <mm/as.h> #include <align.h> #include <config.h> #include <halt.h> #include <arch/interrupt.h> #include <arch/asm.h> #include <debug.h> #include <interrupt.h> void page_arch_init(void) { if (config.cpu_active == 1) { page_mapping_operations = &pt_mapping_operations; page_table_lock(AS_KERNEL, true); /* * PA2KA(identity) mapping for all low-memory frames. */ for (uintptr_t cur = 0; cur < min(config.identity_size, config.physmem_end); cur += FRAME_SIZE) page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, PAGE_GLOBAL | PAGE_CACHEABLE | PAGE_EXEC | PAGE_WRITE | PAGE_READ); page_table_unlock(AS_KERNEL, true); // FIXME: register page fault extension handler write_satp((uintptr_t) AS_KERNEL->genarch.page_table); /* The boot page table is no longer needed. */ // FIXME: frame_mark_available(pt_frame, 1); } } void page_fault(unsigned int n __attribute__((unused)), istate_t *istate) { } void write_satp(uintptr_t ptl0) { uint64_t satp = ((ptl0 >> FRAME_WIDTH) & SATP_PFN_MASK) | SATP_MODE_SV48; asm volatile ( "csrw sptbr, %[satp]\n" :: [satp] "r" (satp) ); } /** @} */