| 1 | /*
|
|---|
| 2 | * Copyright (c) 2016 Martin Decky
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup kernel_riscv64_mm
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <arch/mm/page.h>
|
|---|
| 36 | #include <genarch/mm/page_pt.h>
|
|---|
| 37 | #include <arch/mm/frame.h>
|
|---|
| 38 | #include <arch/cpu.h>
|
|---|
| 39 | #include <mm/frame.h>
|
|---|
| 40 | #include <mm/page.h>
|
|---|
| 41 | #include <mm/as.h>
|
|---|
| 42 | #include <align.h>
|
|---|
| 43 | #include <config.h>
|
|---|
| 44 | #include <halt.h>
|
|---|
| 45 | #include <arch/interrupt.h>
|
|---|
| 46 | #include <arch/asm.h>
|
|---|
| 47 | #include <debug.h>
|
|---|
| 48 | #include <interrupt.h>
|
|---|
| 49 |
|
|---|
| 50 | void page_arch_init(void)
|
|---|
| 51 | {
|
|---|
| 52 | if (config.cpu_active == 1) {
|
|---|
| 53 | page_mapping_operations = &pt_mapping_operations;
|
|---|
| 54 |
|
|---|
| 55 | page_table_lock(AS_KERNEL, true);
|
|---|
| 56 |
|
|---|
| 57 | /*
|
|---|
| 58 | * PA2KA(identity) mapping for all low-memory frames.
|
|---|
| 59 | */
|
|---|
| 60 | for (uintptr_t cur = 0;
|
|---|
| 61 | cur < min(config.identity_size, config.physmem_end);
|
|---|
| 62 | cur += FRAME_SIZE)
|
|---|
| 63 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur,
|
|---|
| 64 | PAGE_GLOBAL | PAGE_CACHEABLE | PAGE_EXEC | PAGE_WRITE | PAGE_READ);
|
|---|
| 65 |
|
|---|
| 66 | page_table_unlock(AS_KERNEL, true);
|
|---|
| 67 |
|
|---|
| 68 | // FIXME: register page fault extension handler
|
|---|
| 69 |
|
|---|
| 70 | write_satp((uintptr_t) AS_KERNEL->genarch.page_table);
|
|---|
| 71 |
|
|---|
| 72 | /* The boot page table is no longer needed. */
|
|---|
| 73 | // FIXME: frame_mark_available(pt_frame, 1);
|
|---|
| 74 | }
|
|---|
| 75 | }
|
|---|
| 76 |
|
|---|
| 77 | void page_fault(unsigned int n __attribute__((unused)), istate_t *istate)
|
|---|
| 78 | {
|
|---|
| 79 | }
|
|---|
| 80 |
|
|---|
| 81 | void write_satp(uintptr_t ptl0)
|
|---|
| 82 | {
|
|---|
| 83 | uint64_t satp = ((ptl0 >> FRAME_WIDTH) & SATP_PFN_MASK) |
|
|---|
| 84 | SATP_MODE_SV48;
|
|---|
| 85 |
|
|---|
| 86 | asm volatile (
|
|---|
| 87 | "csrw satp, %[satpv]\n"
|
|---|
| 88 | :: [satpv] "r" (satp)
|
|---|
| 89 | );
|
|---|
| 90 | }
|
|---|
| 91 |
|
|---|
| 92 | /** @}
|
|---|
| 93 | */
|
|---|
