637 lines
15 KiB
C
637 lines
15 KiB
C
/*
|
|
* Helper functions used by the EFI stub on multiple
|
|
* architectures. This should be #included by the EFI stub
|
|
* implementation files.
|
|
*
|
|
* Copyright 2011 Intel Corporation; author Matt Fleming
|
|
*
|
|
* This file is part of the Linux kernel, and is made available
|
|
* under the terms of the GNU General Public License version 2.
|
|
*
|
|
*/
|
|
#define EFI_READ_CHUNK_SIZE (1024 * 1024)
|
|
|
|
struct file_info {
|
|
efi_file_handle_t *handle;
|
|
u64 size;
|
|
};
|
|
|
|
|
|
|
|
|
|
static void efi_char16_printk(efi_system_table_t *sys_table_arg,
|
|
efi_char16_t *str)
|
|
{
|
|
struct efi_simple_text_output_protocol *out;
|
|
|
|
out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
|
|
efi_call_phys2(out->output_string, out, str);
|
|
}
|
|
|
|
static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
|
|
{
|
|
char *s8;
|
|
|
|
for (s8 = str; *s8; s8++) {
|
|
efi_char16_t ch[2] = { 0 };
|
|
|
|
ch[0] = *s8;
|
|
if (*s8 == '\n') {
|
|
efi_char16_t nl[2] = { '\r', 0 };
|
|
efi_char16_printk(sys_table_arg, nl);
|
|
}
|
|
|
|
efi_char16_printk(sys_table_arg, ch);
|
|
}
|
|
}
|
|
|
|
|
|
static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
|
|
efi_memory_desc_t **map,
|
|
unsigned long *map_size,
|
|
unsigned long *desc_size,
|
|
u32 *desc_ver,
|
|
unsigned long *key_ptr)
|
|
{
|
|
efi_memory_desc_t *m = NULL;
|
|
efi_status_t status;
|
|
unsigned long key;
|
|
u32 desc_version;
|
|
|
|
*map_size = sizeof(*m) * 32;
|
|
again:
|
|
/*
|
|
* Add an additional efi_memory_desc_t because we're doing an
|
|
* allocation which may be in a new descriptor region.
|
|
*/
|
|
*map_size += sizeof(*m);
|
|
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
|
|
EFI_LOADER_DATA, *map_size, (void **)&m);
|
|
if (status != EFI_SUCCESS)
|
|
goto fail;
|
|
|
|
status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
|
|
map_size, m, &key, desc_size, &desc_version);
|
|
if (status == EFI_BUFFER_TOO_SMALL) {
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, m);
|
|
goto again;
|
|
}
|
|
|
|
if (status != EFI_SUCCESS)
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, m);
|
|
if (key_ptr && status == EFI_SUCCESS)
|
|
*key_ptr = key;
|
|
if (desc_ver && status == EFI_SUCCESS)
|
|
*desc_ver = desc_version;
|
|
|
|
fail:
|
|
*map = m;
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Allocate at the highest possible address that is not above 'max'.
|
|
*/
|
|
static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
|
|
unsigned long size, unsigned long align,
|
|
unsigned long *addr, unsigned long max)
|
|
{
|
|
unsigned long map_size, desc_size;
|
|
efi_memory_desc_t *map;
|
|
efi_status_t status;
|
|
unsigned long nr_pages;
|
|
u64 max_addr = 0;
|
|
int i;
|
|
|
|
status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
|
|
NULL, NULL);
|
|
if (status != EFI_SUCCESS)
|
|
goto fail;
|
|
|
|
/*
|
|
* Enforce minimum alignment that EFI requires when requesting
|
|
* a specific address. We are doing page-based allocations,
|
|
* so we must be aligned to a page.
|
|
*/
|
|
if (align < EFI_PAGE_SIZE)
|
|
align = EFI_PAGE_SIZE;
|
|
|
|
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
|
|
again:
|
|
for (i = 0; i < map_size / desc_size; i++) {
|
|
efi_memory_desc_t *desc;
|
|
unsigned long m = (unsigned long)map;
|
|
u64 start, end;
|
|
|
|
desc = (efi_memory_desc_t *)(m + (i * desc_size));
|
|
if (desc->type != EFI_CONVENTIONAL_MEMORY)
|
|
continue;
|
|
|
|
if (desc->num_pages < nr_pages)
|
|
continue;
|
|
|
|
start = desc->phys_addr;
|
|
end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
|
|
|
|
if ((start + size) > end || (start + size) > max)
|
|
continue;
|
|
|
|
if (end - size > max)
|
|
end = max;
|
|
|
|
if (round_down(end - size, align) < start)
|
|
continue;
|
|
|
|
start = round_down(end - size, align);
|
|
|
|
/*
|
|
* Don't allocate at 0x0. It will confuse code that
|
|
* checks pointers against NULL.
|
|
*/
|
|
if (start == 0x0)
|
|
continue;
|
|
|
|
if (start > max_addr)
|
|
max_addr = start;
|
|
}
|
|
|
|
if (!max_addr)
|
|
status = EFI_NOT_FOUND;
|
|
else {
|
|
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
|
|
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
|
|
nr_pages, &max_addr);
|
|
if (status != EFI_SUCCESS) {
|
|
max = max_addr;
|
|
max_addr = 0;
|
|
goto again;
|
|
}
|
|
|
|
*addr = max_addr;
|
|
}
|
|
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, map);
|
|
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Allocate at the lowest possible address.
|
|
*/
|
|
static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
|
|
unsigned long size, unsigned long align,
|
|
unsigned long *addr)
|
|
{
|
|
unsigned long map_size, desc_size;
|
|
efi_memory_desc_t *map;
|
|
efi_status_t status;
|
|
unsigned long nr_pages;
|
|
int i;
|
|
|
|
status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
|
|
NULL, NULL);
|
|
if (status != EFI_SUCCESS)
|
|
goto fail;
|
|
|
|
/*
|
|
* Enforce minimum alignment that EFI requires when requesting
|
|
* a specific address. We are doing page-based allocations,
|
|
* so we must be aligned to a page.
|
|
*/
|
|
if (align < EFI_PAGE_SIZE)
|
|
align = EFI_PAGE_SIZE;
|
|
|
|
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
|
|
for (i = 0; i < map_size / desc_size; i++) {
|
|
efi_memory_desc_t *desc;
|
|
unsigned long m = (unsigned long)map;
|
|
u64 start, end;
|
|
|
|
desc = (efi_memory_desc_t *)(m + (i * desc_size));
|
|
|
|
if (desc->type != EFI_CONVENTIONAL_MEMORY)
|
|
continue;
|
|
|
|
if (desc->num_pages < nr_pages)
|
|
continue;
|
|
|
|
start = desc->phys_addr;
|
|
end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
|
|
|
|
/*
|
|
* Don't allocate at 0x0. It will confuse code that
|
|
* checks pointers against NULL. Skip the first 8
|
|
* bytes so we start at a nice even number.
|
|
*/
|
|
if (start == 0x0)
|
|
start += 8;
|
|
|
|
start = round_up(start, align);
|
|
if ((start + size) > end)
|
|
continue;
|
|
|
|
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
|
|
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
|
|
nr_pages, &start);
|
|
if (status == EFI_SUCCESS) {
|
|
*addr = start;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == map_size / desc_size)
|
|
status = EFI_NOT_FOUND;
|
|
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, map);
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
|
|
unsigned long addr)
|
|
{
|
|
unsigned long nr_pages;
|
|
|
|
if (!size)
|
|
return;
|
|
|
|
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
|
|
efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
|
|
}
|
|
|
|
|
|
/*
|
|
* Check the cmdline for a LILO-style file= arguments.
|
|
*
|
|
* We only support loading a file from the same filesystem as
|
|
* the kernel image.
|
|
*/
|
|
static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
|
|
efi_loaded_image_t *image,
|
|
char *cmd_line, char *option_string,
|
|
unsigned long max_addr,
|
|
unsigned long *load_addr,
|
|
unsigned long *load_size)
|
|
{
|
|
struct file_info *files;
|
|
unsigned long file_addr;
|
|
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
|
|
u64 file_size_total;
|
|
efi_file_io_interface_t *io;
|
|
efi_file_handle_t *fh;
|
|
efi_status_t status;
|
|
int nr_files;
|
|
char *str;
|
|
int i, j, k;
|
|
|
|
file_addr = 0;
|
|
file_size_total = 0;
|
|
|
|
str = cmd_line;
|
|
|
|
j = 0; /* See close_handles */
|
|
|
|
if (!load_addr || !load_size)
|
|
return EFI_INVALID_PARAMETER;
|
|
|
|
*load_addr = 0;
|
|
*load_size = 0;
|
|
|
|
if (!str || !*str)
|
|
return EFI_SUCCESS;
|
|
|
|
for (nr_files = 0; *str; nr_files++) {
|
|
str = strstr(str, option_string);
|
|
if (!str)
|
|
break;
|
|
|
|
str += strlen(option_string);
|
|
|
|
/* Skip any leading slashes */
|
|
while (*str == '/' || *str == '\\')
|
|
str++;
|
|
|
|
while (*str && *str != ' ' && *str != '\n')
|
|
str++;
|
|
}
|
|
|
|
if (!nr_files)
|
|
return EFI_SUCCESS;
|
|
|
|
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
|
|
EFI_LOADER_DATA,
|
|
nr_files * sizeof(*files),
|
|
(void **)&files);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
|
|
goto fail;
|
|
}
|
|
|
|
str = cmd_line;
|
|
for (i = 0; i < nr_files; i++) {
|
|
struct file_info *file;
|
|
efi_file_handle_t *h;
|
|
efi_file_info_t *info;
|
|
efi_char16_t filename_16[256];
|
|
unsigned long info_sz;
|
|
efi_guid_t info_guid = EFI_FILE_INFO_ID;
|
|
efi_char16_t *p;
|
|
u64 file_sz;
|
|
|
|
str = strstr(str, option_string);
|
|
if (!str)
|
|
break;
|
|
|
|
str += strlen(option_string);
|
|
|
|
file = &files[i];
|
|
p = filename_16;
|
|
|
|
/* Skip any leading slashes */
|
|
while (*str == '/' || *str == '\\')
|
|
str++;
|
|
|
|
while (*str && *str != ' ' && *str != '\n') {
|
|
if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
|
|
break;
|
|
|
|
if (*str == '/') {
|
|
*p++ = '\\';
|
|
str++;
|
|
} else {
|
|
*p++ = *str++;
|
|
}
|
|
}
|
|
|
|
*p = '\0';
|
|
|
|
/* Only open the volume once. */
|
|
if (!i) {
|
|
efi_boot_services_t *boottime;
|
|
|
|
boottime = sys_table_arg->boottime;
|
|
|
|
status = efi_call_phys3(boottime->handle_protocol,
|
|
image->device_handle, &fs_proto,
|
|
(void **)&io);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
|
|
goto free_files;
|
|
}
|
|
|
|
status = efi_call_phys2(io->open_volume, io, &fh);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to open volume\n");
|
|
goto free_files;
|
|
}
|
|
}
|
|
|
|
status = efi_call_phys5(fh->open, fh, &h, filename_16,
|
|
EFI_FILE_MODE_READ, (u64)0);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to open file: ");
|
|
efi_char16_printk(sys_table_arg, filename_16);
|
|
efi_printk(sys_table_arg, "\n");
|
|
goto close_handles;
|
|
}
|
|
|
|
file->handle = h;
|
|
|
|
info_sz = 0;
|
|
status = efi_call_phys4(h->get_info, h, &info_guid,
|
|
&info_sz, NULL);
|
|
if (status != EFI_BUFFER_TOO_SMALL) {
|
|
efi_printk(sys_table_arg, "Failed to get file info size\n");
|
|
goto close_handles;
|
|
}
|
|
|
|
grow:
|
|
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
|
|
EFI_LOADER_DATA, info_sz,
|
|
(void **)&info);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
|
|
goto close_handles;
|
|
}
|
|
|
|
status = efi_call_phys4(h->get_info, h, &info_guid,
|
|
&info_sz, info);
|
|
if (status == EFI_BUFFER_TOO_SMALL) {
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool,
|
|
info);
|
|
goto grow;
|
|
}
|
|
|
|
file_sz = info->file_size;
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, info);
|
|
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to get file info\n");
|
|
goto close_handles;
|
|
}
|
|
|
|
file->size = file_sz;
|
|
file_size_total += file_sz;
|
|
}
|
|
|
|
if (file_size_total) {
|
|
unsigned long addr;
|
|
|
|
/*
|
|
* Multiple files need to be at consecutive addresses in memory,
|
|
* so allocate enough memory for all the files. This is used
|
|
* for loading multiple files.
|
|
*/
|
|
status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
|
|
&file_addr, max_addr);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
|
|
goto close_handles;
|
|
}
|
|
|
|
/* We've run out of free low memory. */
|
|
if (file_addr > max_addr) {
|
|
efi_printk(sys_table_arg, "We've run out of free low memory\n");
|
|
status = EFI_INVALID_PARAMETER;
|
|
goto free_file_total;
|
|
}
|
|
|
|
addr = file_addr;
|
|
for (j = 0; j < nr_files; j++) {
|
|
unsigned long size;
|
|
|
|
size = files[j].size;
|
|
while (size) {
|
|
unsigned long chunksize;
|
|
if (size > EFI_READ_CHUNK_SIZE)
|
|
chunksize = EFI_READ_CHUNK_SIZE;
|
|
else
|
|
chunksize = size;
|
|
status = efi_call_phys3(fh->read,
|
|
files[j].handle,
|
|
&chunksize,
|
|
(void *)addr);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to read file\n");
|
|
goto free_file_total;
|
|
}
|
|
addr += chunksize;
|
|
size -= chunksize;
|
|
}
|
|
|
|
efi_call_phys1(fh->close, files[j].handle);
|
|
}
|
|
|
|
}
|
|
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, files);
|
|
|
|
*load_addr = file_addr;
|
|
*load_size = file_size_total;
|
|
|
|
return status;
|
|
|
|
free_file_total:
|
|
efi_free(sys_table_arg, file_size_total, file_addr);
|
|
|
|
close_handles:
|
|
for (k = j; k < i; k++)
|
|
efi_call_phys1(fh->close, files[k].handle);
|
|
free_files:
|
|
efi_call_phys1(sys_table_arg->boottime->free_pool, files);
|
|
fail:
|
|
*load_addr = 0;
|
|
*load_size = 0;
|
|
|
|
return status;
|
|
}
|
|
/*
|
|
* Relocate a kernel image, either compressed or uncompressed.
|
|
* In the ARM64 case, all kernel images are currently
|
|
* uncompressed, and as such when we relocate it we need to
|
|
* allocate additional space for the BSS segment. Any low
|
|
* memory that this function should avoid needs to be
|
|
* unavailable in the EFI memory map, as if the preferred
|
|
* address is not available the lowest available address will
|
|
* be used.
|
|
*/
|
|
static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
|
|
unsigned long *image_addr,
|
|
unsigned long image_size,
|
|
unsigned long alloc_size,
|
|
unsigned long preferred_addr,
|
|
unsigned long alignment)
|
|
{
|
|
unsigned long cur_image_addr;
|
|
unsigned long new_addr = 0;
|
|
efi_status_t status;
|
|
unsigned long nr_pages;
|
|
efi_physical_addr_t efi_addr = preferred_addr;
|
|
|
|
if (!image_addr || !image_size || !alloc_size)
|
|
return EFI_INVALID_PARAMETER;
|
|
if (alloc_size < image_size)
|
|
return EFI_INVALID_PARAMETER;
|
|
|
|
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);
|
|
|
|
/* 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;
|
|
}
|