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efi: Move unicode to ASCII conversion to shared function. 

Move the open-coded conversion to a shared function for
use by all architectures.  Change the allocation to prefer
a high address for ARM, as this is required to avoid conflicts
with reserved regions in low memory.  We don't know the specifics
of these regions until after we process the command line and
device tree.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Roy Franz 2013-09-22 15:45:33 -07:00 committed by Matt Fleming
parent 4a9f3a7c33
commit 5fef3870c5
2 changed files with 67 additions and 37 deletions
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43
arch/x86/boot/compressed/eboot.c
View File

@ -435,11 +435,10 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
struct efi_info *efi;
efi_loaded_image_t *image;
void *options;
u32 load_options_size;
efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
int options_size = 0;
efi_status_t status;
unsigned long cmdline;
char *cmdline_ptr;
u16 *s2;
u8 *s1;
int i;
@ -487,41 +486,11 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
hdr->type_of_loader = 0x21;
/* Convert unicode cmdline to ascii */
options = image->load_options;
load_options_size = image->load_options_size / 2; /* ASCII */
cmdline = 0;
s2 = (u16 *)options;
if (s2) {
while (*s2 && *s2 != '\n' && options_size < load_options_size) {
s2++;
options_size++;
}
if (options_size) {
if (options_size > hdr->cmdline_size)
options_size = hdr->cmdline_size;
options_size++; /* NUL termination */
status = efi_low_alloc(sys_table, options_size, 1,
&cmdline);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc mem for cmdline\n");
goto fail;
}
s1 = (u8 *)(unsigned long)cmdline;
s2 = (u16 *)options;
for (i = 0; i < options_size - 1; i++)
*s1++ = *s2++;
*s1 = '\0';
}
}
hdr->cmd_line_ptr = cmdline;
cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
&options_size);
if (!cmdline_ptr)
goto fail;
hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
hdr->ramdisk_image = 0;
hdr->ramdisk_size = 0;

61
drivers/firmware/efi/efi-stub-helper.c
View File

@ -554,3 +554,64 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
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;
}