paul@181 | 1 | /* |
paul@181 | 2 | * Memory sharing abstractions. |
paul@181 | 3 | * |
paul@308 | 4 | * Copyright (C) 2018, 2019, 2021, 2022 Paul Boddie <paul@boddie.org.uk> |
paul@181 | 5 | * |
paul@181 | 6 | * This program is free software; you can redistribute it and/or |
paul@181 | 7 | * modify it under the terms of the GNU General Public License as |
paul@181 | 8 | * published by the Free Software Foundation; either version 2 of |
paul@181 | 9 | * the License, or (at your option) any later version. |
paul@181 | 10 | * |
paul@181 | 11 | * This program is distributed in the hope that it will be useful, |
paul@181 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
paul@181 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
paul@181 | 14 | * GNU General Public License for more details. |
paul@181 | 15 | * |
paul@181 | 16 | * You should have received a copy of the GNU General Public License |
paul@181 | 17 | * along with this program; if not, write to the Free Software |
paul@181 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
paul@181 | 19 | * Boston, MA 02110-1301, USA |
paul@181 | 20 | */ |
paul@181 | 21 | |
paul@181 | 22 | #include <l4/re/c/mem_alloc.h> |
paul@181 | 23 | #include <l4/sys/err.h> |
paul@181 | 24 | #include <l4/sys/types.h> |
paul@181 | 25 | |
paul@181 | 26 | #include "cap_alloc.h" |
paul@181 | 27 | #include "mem_ipc.h" |
paul@181 | 28 | #include "semaphore.h" |
paul@181 | 29 | |
paul@181 | 30 | |
paul@181 | 31 | |
paul@181 | 32 | /* Semaphore used if threading has been initialised by ipc_mem_init. */ |
paul@181 | 33 | |
paul@181 | 34 | l4_cap_idx_t ipc_mem_semaphore = L4_INVALID_CAP; |
paul@181 | 35 | |
paul@181 | 36 | |
paul@181 | 37 | |
paul@181 | 38 | /* Generic memory allocation. */ |
paul@181 | 39 | |
paul@181 | 40 | long ipc_allocate(unsigned long size, void **addr, l4re_ds_t *ds) |
paul@181 | 41 | { |
paul@308 | 42 | return ipc_allocate_align(size, L4RE_RM_F_SEARCH_ADDR | L4RE_RM_F_RW, |
paul@308 | 43 | L4_PAGESHIFT, addr, ds); |
paul@308 | 44 | } |
paul@308 | 45 | |
paul@308 | 46 | long ipc_allocate_align(unsigned long size, l4re_rm_flags_t flags, |
paul@308 | 47 | unsigned char align, void **addr, l4re_ds_t *ds) |
paul@308 | 48 | { |
paul@181 | 49 | /* Allocate a capability for the dataspace. */ |
paul@181 | 50 | |
paul@181 | 51 | *ds = ipc_cap_alloc(); |
paul@181 | 52 | |
paul@181 | 53 | if (l4_is_invalid_cap(*ds)) |
paul@181 | 54 | return -L4_ENOENT; |
paul@181 | 55 | |
paul@181 | 56 | /* Allocate and attach the memory for the dataspace. */ |
paul@181 | 57 | |
paul@308 | 58 | if (ipc_new_dataspace(*ds, size, 0, align)) |
paul@181 | 59 | { |
paul@181 | 60 | ipc_cap_free_um(*ds); |
paul@181 | 61 | return -L4_ENOMEM; |
paul@181 | 62 | } |
paul@181 | 63 | |
paul@308 | 64 | if (ipc_attach_dataspace_align(*ds, size, flags, align, addr)) |
paul@181 | 65 | { |
paul@181 | 66 | ipc_cap_free_um(*ds); |
paul@181 | 67 | return -L4_ENOMEM; |
paul@181 | 68 | } |
paul@181 | 69 | |
paul@181 | 70 | return L4_EOK; |
paul@181 | 71 | } |
paul@181 | 72 | |
paul@181 | 73 | /* Create a dataspace. Equivalent to l4re_ma_alloc_align. */ |
paul@181 | 74 | |
paul@181 | 75 | long ipc_new_dataspace(l4_cap_idx_t cap, l4_mword_t size, l4_umword_t flags, l4_umword_t align) |
paul@181 | 76 | { |
paul@181 | 77 | return l4re_ma_alloc_align(size, cap, flags, align); |
paul@181 | 78 | } |
paul@181 | 79 | |
paul@181 | 80 | /* Attach a dataspace region. Similar to l4re_rm_attach. */ |
paul@181 | 81 | |
paul@181 | 82 | long ipc_attach_dataspace(l4re_ds_t ds, unsigned long size, void **addr) |
paul@181 | 83 | { |
paul@308 | 84 | return ipc_attach_dataspace_align(ds, size, L4RE_RM_F_SEARCH_ADDR | L4RE_RM_F_RW, |
paul@308 | 85 | L4_PAGESHIFT, addr); |
paul@308 | 86 | } |
paul@308 | 87 | |
paul@308 | 88 | long ipc_attach_dataspace_align(l4re_ds_t ds, unsigned long size, |
paul@308 | 89 | l4re_rm_flags_t flags, unsigned char align, |
paul@308 | 90 | void **addr) |
paul@308 | 91 | { |
paul@181 | 92 | long err; |
paul@181 | 93 | |
paul@181 | 94 | err = ipc_semaphore_down(ipc_mem_semaphore); |
paul@181 | 95 | if (err) |
paul@181 | 96 | return err; |
paul@181 | 97 | |
paul@187 | 98 | /* The region manager has changed, requiring rights flags for successful use |
paul@187 | 99 | of the mapped region. */ |
paul@187 | 100 | |
paul@308 | 101 | err = l4re_rm_attach(addr, size, flags, ds, 0, align); |
paul@181 | 102 | |
paul@181 | 103 | ipc_semaphore_up(ipc_mem_semaphore); |
paul@181 | 104 | |
paul@181 | 105 | return err; |
paul@181 | 106 | } |
paul@181 | 107 | |
paul@181 | 108 | /* Detach a dataspace region. Equivalent to l4re_rm_detach_unmap. */ |
paul@181 | 109 | |
paul@181 | 110 | long ipc_detach_dataspace(void *addr) |
paul@181 | 111 | { |
paul@181 | 112 | long err; |
paul@181 | 113 | |
paul@181 | 114 | err = ipc_semaphore_down(ipc_mem_semaphore); |
paul@181 | 115 | if (err) |
paul@181 | 116 | return err; |
paul@181 | 117 | |
paul@181 | 118 | err = l4re_rm_detach_unmap((l4_addr_t) addr, L4RE_THIS_TASK_CAP); |
paul@181 | 119 | |
paul@181 | 120 | ipc_semaphore_up(ipc_mem_semaphore); |
paul@181 | 121 | |
paul@181 | 122 | return err; |
paul@181 | 123 | } |
paul@181 | 124 | |
paul@181 | 125 | /* Obtain a dataspace size. Equivalent to l4re_ds_size. */ |
paul@181 | 126 | |
paul@181 | 127 | long ipc_dataspace_size(l4_cap_idx_t cap, unsigned long *size) |
paul@181 | 128 | { |
paul@181 | 129 | *size = l4re_ds_size(cap); |
paul@181 | 130 | return L4_EOK; |
paul@181 | 131 | } |
paul@181 | 132 | |
paul@181 | 133 | // vim: tabstop=2 expandtab shiftwidth=2 |