mirror of https://gitee.com/openkylin/linux.git
638 lines
15 KiB
C
638 lines
15 KiB
C
/*
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* Helper functions used by the EFI stub on multiple
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* architectures. This should be #included by the EFI stub
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* implementation files.
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*
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* Copyright 2011 Intel Corporation; author Matt Fleming
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*
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* This file is part of the Linux kernel, and is made available
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* under the terms of the GNU General Public License version 2.
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*
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*/
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#define EFI_READ_CHUNK_SIZE (1024 * 1024)
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struct initrd {
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efi_file_handle_t *handle;
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u64 size;
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};
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static void efi_char16_printk(efi_system_table_t *sys_table_arg,
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efi_char16_t *str)
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{
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struct efi_simple_text_output_protocol *out;
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out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
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efi_call_phys2(out->output_string, out, str);
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}
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static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
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{
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char *s8;
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for (s8 = str; *s8; s8++) {
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efi_char16_t ch[2] = { 0 };
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ch[0] = *s8;
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if (*s8 == '\n') {
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efi_char16_t nl[2] = { '\r', 0 };
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efi_char16_printk(sys_table_arg, nl);
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}
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efi_char16_printk(sys_table_arg, ch);
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}
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}
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static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
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efi_memory_desc_t **map,
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unsigned long *map_size,
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unsigned long *desc_size,
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u32 *desc_ver,
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unsigned long *key_ptr)
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{
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efi_memory_desc_t *m = NULL;
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efi_status_t status;
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unsigned long key;
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u32 desc_version;
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*map_size = sizeof(*m) * 32;
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again:
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/*
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* Add an additional efi_memory_desc_t because we're doing an
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* allocation which may be in a new descriptor region.
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*/
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*map_size += sizeof(*m);
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status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
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EFI_LOADER_DATA, *map_size, (void **)&m);
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if (status != EFI_SUCCESS)
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goto fail;
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status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
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map_size, m, &key, desc_size, &desc_version);
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if (status == EFI_BUFFER_TOO_SMALL) {
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efi_call_phys1(sys_table_arg->boottime->free_pool, m);
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goto again;
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}
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if (status != EFI_SUCCESS)
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efi_call_phys1(sys_table_arg->boottime->free_pool, m);
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if (key_ptr && status == EFI_SUCCESS)
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*key_ptr = key;
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if (desc_ver && status == EFI_SUCCESS)
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*desc_ver = desc_version;
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fail:
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*map = m;
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return status;
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}
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/*
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* Allocate at the highest possible address that is not above 'max'.
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*/
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static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
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unsigned long size, unsigned long align,
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unsigned long *addr, unsigned long max)
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{
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unsigned long map_size, desc_size;
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efi_memory_desc_t *map;
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efi_status_t status;
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unsigned long nr_pages;
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u64 max_addr = 0;
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int i;
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status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
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NULL, NULL);
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if (status != EFI_SUCCESS)
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goto fail;
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/*
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* Enforce minimum alignment that EFI requires when requesting
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* a specific address. We are doing page-based allocations,
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* so we must be aligned to a page.
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*/
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if (align < EFI_PAGE_SIZE)
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align = EFI_PAGE_SIZE;
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nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
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again:
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for (i = 0; i < map_size / desc_size; i++) {
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efi_memory_desc_t *desc;
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unsigned long m = (unsigned long)map;
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u64 start, end;
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desc = (efi_memory_desc_t *)(m + (i * desc_size));
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if (desc->type != EFI_CONVENTIONAL_MEMORY)
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continue;
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if (desc->num_pages < nr_pages)
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continue;
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start = desc->phys_addr;
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end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
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if ((start + size) > end || (start + size) > max)
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continue;
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if (end - size > max)
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end = max;
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if (round_down(end - size, align) < start)
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continue;
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start = round_down(end - size, align);
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/*
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* Don't allocate at 0x0. It will confuse code that
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* checks pointers against NULL.
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*/
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if (start == 0x0)
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continue;
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if (start > max_addr)
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max_addr = start;
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}
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if (!max_addr)
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status = EFI_NOT_FOUND;
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else {
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status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
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EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
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nr_pages, &max_addr);
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if (status != EFI_SUCCESS) {
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max = max_addr;
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max_addr = 0;
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goto again;
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}
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*addr = max_addr;
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}
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free_pool:
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efi_call_phys1(sys_table_arg->boottime->free_pool, map);
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fail:
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return status;
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}
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/*
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* Allocate at the lowest possible address.
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*/
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static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
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unsigned long size, unsigned long align,
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unsigned long *addr)
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{
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unsigned long map_size, desc_size;
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efi_memory_desc_t *map;
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efi_status_t status;
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unsigned long nr_pages;
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int i;
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status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
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NULL, NULL);
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if (status != EFI_SUCCESS)
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goto fail;
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/*
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* Enforce minimum alignment that EFI requires when requesting
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* a specific address. We are doing page-based allocations,
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* so we must be aligned to a page.
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*/
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if (align < EFI_PAGE_SIZE)
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align = EFI_PAGE_SIZE;
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nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
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for (i = 0; i < map_size / desc_size; i++) {
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efi_memory_desc_t *desc;
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unsigned long m = (unsigned long)map;
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u64 start, end;
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desc = (efi_memory_desc_t *)(m + (i * desc_size));
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if (desc->type != EFI_CONVENTIONAL_MEMORY)
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continue;
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if (desc->num_pages < nr_pages)
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continue;
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start = desc->phys_addr;
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end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
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/*
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* Don't allocate at 0x0. It will confuse code that
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* checks pointers against NULL. Skip the first 8
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* bytes so we start at a nice even number.
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*/
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if (start == 0x0)
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start += 8;
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start = round_up(start, align);
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if ((start + size) > end)
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continue;
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status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
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EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
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nr_pages, &start);
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if (status == EFI_SUCCESS) {
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*addr = start;
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break;
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}
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}
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if (i == map_size / desc_size)
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status = EFI_NOT_FOUND;
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free_pool:
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efi_call_phys1(sys_table_arg->boottime->free_pool, map);
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fail:
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return status;
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}
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static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
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unsigned long addr)
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{
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unsigned long nr_pages;
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if (!size)
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return;
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nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
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efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
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}
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/*
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* Check the cmdline for a LILO-style initrd= arguments.
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*
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* We only support loading an initrd from the same filesystem as the
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* kernel image.
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*/
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static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
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efi_loaded_image_t *image,
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char *cmd_line, char *option_string,
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unsigned long max_addr,
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unsigned long *load_addr,
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unsigned long *load_size)
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{
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struct initrd *initrds;
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unsigned long initrd_addr;
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efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
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u64 initrd_total;
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efi_file_io_interface_t *io;
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efi_file_handle_t *fh;
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efi_status_t status;
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int nr_initrds;
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char *str;
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int i, j, k;
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initrd_addr = 0;
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initrd_total = 0;
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str = cmd_line;
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j = 0; /* See close_handles */
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if (!load_addr || !load_size)
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return EFI_INVALID_PARAMETER;
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*load_addr = 0;
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*load_size = 0;
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if (!str || !*str)
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return EFI_SUCCESS;
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for (nr_initrds = 0; *str; nr_initrds++) {
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str = strstr(str, option_string);
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if (!str)
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break;
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str += strlen(option_string);
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/* Skip any leading slashes */
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while (*str == '/' || *str == '\\')
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str++;
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while (*str && *str != ' ' && *str != '\n')
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str++;
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}
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if (!nr_initrds)
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return EFI_SUCCESS;
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status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
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EFI_LOADER_DATA,
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nr_initrds * sizeof(*initrds),
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&initrds);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to alloc mem for file load\n");
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goto fail;
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}
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str = cmd_line;
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for (i = 0; i < nr_initrds; i++) {
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struct initrd *initrd;
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efi_file_handle_t *h;
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efi_file_info_t *info;
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efi_char16_t filename_16[256];
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unsigned long info_sz;
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efi_guid_t info_guid = EFI_FILE_INFO_ID;
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efi_char16_t *p;
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u64 file_sz;
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str = strstr(str, option_string);
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if (!str)
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break;
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str += strlen(option_string);
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initrd = &initrds[i];
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p = filename_16;
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/* Skip any leading slashes */
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while (*str == '/' || *str == '\\')
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str++;
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while (*str && *str != ' ' && *str != '\n') {
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if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
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break;
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if (*str == '/') {
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*p++ = '\\';
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*str++;
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} else {
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*p++ = *str++;
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}
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}
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*p = '\0';
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/* Only open the volume once. */
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if (!i) {
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efi_boot_services_t *boottime;
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boottime = sys_table_arg->boottime;
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status = efi_call_phys3(boottime->handle_protocol,
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image->device_handle, &fs_proto, &io);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
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goto free_initrds;
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}
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status = efi_call_phys2(io->open_volume, io, &fh);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to open volume\n");
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goto free_initrds;
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}
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}
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status = efi_call_phys5(fh->open, fh, &h, filename_16,
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EFI_FILE_MODE_READ, (u64)0);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to open file: ");
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efi_char16_printk(sys_table_arg, filename_16);
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efi_printk(sys_table_arg, "\n");
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goto close_handles;
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}
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initrd->handle = h;
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info_sz = 0;
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status = efi_call_phys4(h->get_info, h, &info_guid,
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&info_sz, NULL);
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if (status != EFI_BUFFER_TOO_SMALL) {
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efi_printk(sys_table_arg, "Failed to get file info size\n");
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goto close_handles;
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}
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grow:
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status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
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EFI_LOADER_DATA, info_sz, &info);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
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goto close_handles;
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}
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status = efi_call_phys4(h->get_info, h, &info_guid,
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&info_sz, info);
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if (status == EFI_BUFFER_TOO_SMALL) {
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efi_call_phys1(sys_table_arg->boottime->free_pool,
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info);
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goto grow;
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}
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file_sz = info->file_size;
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efi_call_phys1(sys_table_arg->boottime->free_pool, info);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to get file info\n");
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goto close_handles;
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}
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initrd->size = file_sz;
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initrd_total += file_sz;
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}
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if (initrd_total) {
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unsigned long addr;
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/*
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* Multiple initrd's need to be at consecutive
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* addresses in memory, so allocate enough memory for
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* all the initrd's.
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*/
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status = efi_high_alloc(sys_table_arg, initrd_total, 0x1000,
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&initrd_addr, max_addr);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to alloc highmem for initrds\n");
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goto close_handles;
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}
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/* We've run out of free low memory. */
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if (initrd_addr > max_addr) {
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efi_printk(sys_table_arg, "We've run out of free low memory\n");
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status = EFI_INVALID_PARAMETER;
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goto free_initrd_total;
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}
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addr = initrd_addr;
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for (j = 0; j < nr_initrds; j++) {
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u64 size;
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size = initrds[j].size;
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while (size) {
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u64 chunksize;
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if (size > EFI_READ_CHUNK_SIZE)
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chunksize = EFI_READ_CHUNK_SIZE;
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else
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chunksize = size;
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status = efi_call_phys3(fh->read,
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initrds[j].handle,
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&chunksize, addr);
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if (status != EFI_SUCCESS) {
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efi_printk(sys_table_arg, "Failed to read file\n");
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goto free_initrd_total;
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}
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addr += chunksize;
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size -= chunksize;
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}
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efi_call_phys1(fh->close, initrds[j].handle);
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}
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}
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efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);
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*load_addr = initrd_addr;
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*load_size = initrd_total;
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return status;
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free_initrd_total:
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efi_free(sys_table_arg, initrd_total, initrd_addr);
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close_handles:
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for (k = j; k < i; k++)
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efi_call_phys1(fh->close, initrds[k].handle);
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free_initrds:
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efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);
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fail:
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*load_addr = 0;
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*load_size = 0;
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return status;
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}
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/*
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* Relocate a kernel image, either compressed or uncompressed.
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* In the ARM64 case, all kernel images are currently
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* uncompressed, and as such when we relocate it we need to
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* allocate additional space for the BSS segment. Any low
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* memory that this function should avoid needs to be
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* unavailable in the EFI memory map, as if the preferred
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* address is not available the lowest available address will
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* be used.
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*/
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static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
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unsigned long *image_addr,
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unsigned long image_size,
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unsigned long alloc_size,
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unsigned long preferred_addr,
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unsigned long alignment)
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{
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unsigned long cur_image_addr;
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unsigned long new_addr = 0;
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efi_status_t status;
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unsigned long nr_pages;
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efi_physical_addr_t efi_addr = preferred_addr;
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if (!image_addr || !image_size || !alloc_size)
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return EFI_INVALID_PARAMETER;
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if (alloc_size < image_size)
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return EFI_INVALID_PARAMETER;
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|
cur_image_addr = *image_addr;
|
|
|
|
/*
|
|
* The EFI firmware loader could have placed the kernel image
|
|
* anywhere in memory, but the kernel has restrictions on the
|
|
* max physical address it can run at. Some architectures
|
|
* also have a prefered address, so first try to relocate
|
|
* to the preferred address. If that fails, allocate as low
|
|
* as possible while respecting the required alignment.
|
|
*/
|
|
nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
|
|
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
|
|
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
|
|
nr_pages, &efi_addr);
|
|
new_addr = efi_addr;
|
|
/*
|
|
* If preferred address allocation failed allocate as low as
|
|
* possible.
|
|
*/
|
|
if (status != EFI_SUCCESS) {
|
|
status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
|
|
&new_addr);
|
|
}
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* We know source/dest won't overlap since both memory ranges
|
|
* have been allocated by UEFI, so we can safely use memcpy.
|
|
*/
|
|
memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
|
|
/* Zero any extra space we may have allocated for BSS. */
|
|
memset((void *)(new_addr + image_size), alloc_size - image_size, 0);
|
|
|
|
/* Return the new address of the relocated image. */
|
|
*image_addr = new_addr;
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Convert the unicode UEFI command line to ASCII to pass to kernel.
|
|
* Size of memory allocated return in *cmd_line_len.
|
|
* Returns NULL on error.
|
|
*/
|
|
static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
|
|
efi_loaded_image_t *image,
|
|
int *cmd_line_len)
|
|
{
|
|
u16 *s2;
|
|
u8 *s1 = NULL;
|
|
unsigned long cmdline_addr = 0;
|
|
int load_options_size = image->load_options_size / 2; /* ASCII */
|
|
void *options = image->load_options;
|
|
int options_size = 0;
|
|
efi_status_t status;
|
|
int i;
|
|
u16 zero = 0;
|
|
|
|
if (options) {
|
|
s2 = options;
|
|
while (*s2 && *s2 != '\n' && options_size < load_options_size) {
|
|
s2++;
|
|
options_size++;
|
|
}
|
|
}
|
|
|
|
if (options_size == 0) {
|
|
/* No command line options, so return empty string*/
|
|
options_size = 1;
|
|
options = &zero;
|
|
}
|
|
|
|
options_size++; /* NUL termination */
|
|
#ifdef CONFIG_ARM
|
|
/*
|
|
* For ARM, allocate at a high address to avoid reserved
|
|
* regions at low addresses that we don't know the specfics of
|
|
* at the time we are processing the command line.
|
|
*/
|
|
status = efi_high_alloc(sys_table_arg, options_size, 0,
|
|
&cmdline_addr, 0xfffff000);
|
|
#else
|
|
status = efi_low_alloc(sys_table_arg, options_size, 0,
|
|
&cmdline_addr);
|
|
#endif
|
|
if (status != EFI_SUCCESS)
|
|
return NULL;
|
|
|
|
s1 = (u8 *)cmdline_addr;
|
|
s2 = (u16 *)options;
|
|
|
|
for (i = 0; i < options_size - 1; i++)
|
|
*s1++ = *s2++;
|
|
|
|
*s1 = '\0';
|
|
|
|
*cmd_line_len = options_size;
|
|
return (char *)cmdline_addr;
|
|
}
|