mirror of
https://github.com/torvalds/linux.git
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Merge remote-tracking branch 'efi/urgent' into x86/urgent
Matt Fleming (1):
x86, efivars: firmware bug workarounds should be in platform
code
Matthew Garrett (3):
Move utf16 functions to kernel core and rename
efi: Pass boot services variable info to runtime code
efi: Distinguish between "remaining space" and actually used
space
Richard Weinberger (2):
x86,efi: Check max_size only if it is non-zero.
x86,efi: Implement efi_no_storage_paranoia parameter
Sergey Vlasov (2):
x86/Kconfig: Make EFI select UCS2_STRING
efi: Export efi_query_variable_store() for efivars.ko
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin
commit
c0a9f451e4
@ -788,6 +788,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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edd= [EDD]
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Format: {"off" | "on" | "skip[mbr]"}
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efi_no_storage_paranoia [EFI; X86]
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Using this parameter you can use more than 50% of
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your efi variable storage. Use this parameter only if
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you are really sure that your UEFI does sane gc and
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fulfills the spec otherwise your board may brick.
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eisa_irq_edge= [PARISC,HW]
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See header of drivers/parisc/eisa.c.
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@ -1549,6 +1549,7 @@ config X86_SMAP
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config EFI
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bool "EFI runtime service support"
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depends on ACPI
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select UCS2_STRING
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---help---
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This enables the kernel to use EFI runtime services that are
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available (such as the EFI variable services).
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@ -251,6 +251,51 @@ static void find_bits(unsigned long mask, u8 *pos, u8 *size)
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*size = len;
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}
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static efi_status_t setup_efi_vars(struct boot_params *params)
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{
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struct setup_data *data;
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struct efi_var_bootdata *efidata;
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u64 store_size, remaining_size, var_size;
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efi_status_t status;
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if (!sys_table->runtime->query_variable_info)
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return EFI_UNSUPPORTED;
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data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
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while (data && data->next)
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data = (struct setup_data *)(unsigned long)data->next;
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status = efi_call_phys4(sys_table->runtime->query_variable_info,
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EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS, &store_size,
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&remaining_size, &var_size);
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if (status != EFI_SUCCESS)
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return status;
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status = efi_call_phys3(sys_table->boottime->allocate_pool,
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EFI_LOADER_DATA, sizeof(*efidata), &efidata);
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if (status != EFI_SUCCESS)
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return status;
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efidata->data.type = SETUP_EFI_VARS;
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efidata->data.len = sizeof(struct efi_var_bootdata) -
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sizeof(struct setup_data);
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efidata->data.next = 0;
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efidata->store_size = store_size;
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efidata->remaining_size = remaining_size;
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efidata->max_var_size = var_size;
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if (data)
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data->next = (unsigned long)efidata;
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else
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params->hdr.setup_data = (unsigned long)efidata;
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}
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static efi_status_t setup_efi_pci(struct boot_params *params)
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{
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efi_pci_io_protocol *pci;
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@ -1157,6 +1202,8 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
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setup_graphics(boot_params);
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setup_efi_vars(boot_params);
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setup_efi_pci(boot_params);
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status = efi_call_phys3(sys_table->boottime->allocate_pool,
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@ -102,6 +102,13 @@ extern void efi_call_phys_epilog(void);
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extern void efi_unmap_memmap(void);
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extern void efi_memory_uc(u64 addr, unsigned long size);
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struct efi_var_bootdata {
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struct setup_data data;
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u64 store_size;
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u64 remaining_size;
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u64 max_var_size;
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};
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#ifdef CONFIG_EFI
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static inline bool efi_is_native(void)
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@ -6,6 +6,7 @@
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#define SETUP_E820_EXT 1
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#define SETUP_DTB 2
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#define SETUP_PCI 3
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#define SETUP_EFI_VARS 4
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/* ram_size flags */
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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@ -41,6 +41,7 @@
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#include <linux/io.h>
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#include <linux/reboot.h>
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#include <linux/bcd.h>
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#include <linux/ucs2_string.h>
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#include <asm/setup.h>
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#include <asm/efi.h>
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@ -51,6 +52,13 @@
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#define EFI_DEBUG 1
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/*
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* There's some additional metadata associated with each
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* variable. Intel's reference implementation is 60 bytes - bump that
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* to account for potential alignment constraints
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*/
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#define VAR_METADATA_SIZE 64
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struct efi __read_mostly efi = {
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.mps = EFI_INVALID_TABLE_ADDR,
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.acpi = EFI_INVALID_TABLE_ADDR,
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@ -69,6 +77,13 @@ struct efi_memory_map memmap;
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static struct efi efi_phys __initdata;
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static efi_system_table_t efi_systab __initdata;
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static u64 efi_var_store_size;
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static u64 efi_var_remaining_size;
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static u64 efi_var_max_var_size;
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static u64 boot_used_size;
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static u64 boot_var_size;
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static u64 active_size;
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unsigned long x86_efi_facility;
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/*
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@ -98,6 +113,15 @@ static int __init setup_add_efi_memmap(char *arg)
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}
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early_param("add_efi_memmap", setup_add_efi_memmap);
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static bool efi_no_storage_paranoia;
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static int __init setup_storage_paranoia(char *arg)
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{
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efi_no_storage_paranoia = true;
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return 0;
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}
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early_param("efi_no_storage_paranoia", setup_storage_paranoia);
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static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
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{
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@ -162,8 +186,53 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
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efi_char16_t *name,
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efi_guid_t *vendor)
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{
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return efi_call_virt3(get_next_variable,
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efi_status_t status;
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static bool finished = false;
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static u64 var_size;
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status = efi_call_virt3(get_next_variable,
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name_size, name, vendor);
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if (status == EFI_NOT_FOUND) {
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finished = true;
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if (var_size < boot_used_size) {
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boot_var_size = boot_used_size - var_size;
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active_size += boot_var_size;
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} else {
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printk(KERN_WARNING FW_BUG "efi: Inconsistent initial sizes\n");
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}
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}
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if (boot_used_size && !finished) {
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unsigned long size;
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u32 attr;
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efi_status_t s;
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void *tmp;
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s = virt_efi_get_variable(name, vendor, &attr, &size, NULL);
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if (s != EFI_BUFFER_TOO_SMALL || !size)
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return status;
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tmp = kmalloc(size, GFP_ATOMIC);
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if (!tmp)
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return status;
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s = virt_efi_get_variable(name, vendor, &attr, &size, tmp);
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if (s == EFI_SUCCESS && (attr & EFI_VARIABLE_NON_VOLATILE)) {
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var_size += size;
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var_size += ucs2_strsize(name, 1024);
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active_size += size;
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active_size += VAR_METADATA_SIZE;
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active_size += ucs2_strsize(name, 1024);
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}
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kfree(tmp);
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}
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return status;
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}
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static efi_status_t virt_efi_set_variable(efi_char16_t *name,
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@ -172,9 +241,34 @@ static efi_status_t virt_efi_set_variable(efi_char16_t *name,
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unsigned long data_size,
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void *data)
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{
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return efi_call_virt5(set_variable,
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efi_status_t status;
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u32 orig_attr = 0;
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unsigned long orig_size = 0;
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status = virt_efi_get_variable(name, vendor, &orig_attr, &orig_size,
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NULL);
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if (status != EFI_BUFFER_TOO_SMALL)
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orig_size = 0;
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status = efi_call_virt5(set_variable,
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name, vendor, attr,
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data_size, data);
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if (status == EFI_SUCCESS) {
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if (orig_size) {
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active_size -= orig_size;
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active_size -= ucs2_strsize(name, 1024);
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active_size -= VAR_METADATA_SIZE;
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}
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if (data_size) {
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active_size += data_size;
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active_size += ucs2_strsize(name, 1024);
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active_size += VAR_METADATA_SIZE;
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}
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}
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return status;
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}
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static efi_status_t virt_efi_query_variable_info(u32 attr,
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@ -682,6 +776,9 @@ void __init efi_init(void)
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char vendor[100] = "unknown";
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int i = 0;
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void *tmp;
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struct setup_data *data;
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struct efi_var_bootdata *efi_var_data;
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u64 pa_data;
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#ifdef CONFIG_X86_32
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if (boot_params.efi_info.efi_systab_hi ||
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@ -699,6 +796,22 @@ void __init efi_init(void)
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if (efi_systab_init(efi_phys.systab))
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return;
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pa_data = boot_params.hdr.setup_data;
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while (pa_data) {
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data = early_ioremap(pa_data, sizeof(*efi_var_data));
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if (data->type == SETUP_EFI_VARS) {
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efi_var_data = (struct efi_var_bootdata *)data;
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efi_var_store_size = efi_var_data->store_size;
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efi_var_remaining_size = efi_var_data->remaining_size;
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efi_var_max_var_size = efi_var_data->max_var_size;
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}
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pa_data = data->next;
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early_iounmap(data, sizeof(*efi_var_data));
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}
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boot_used_size = efi_var_store_size - efi_var_remaining_size;
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set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
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/*
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@ -999,3 +1112,48 @@ u64 efi_mem_attributes(unsigned long phys_addr)
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}
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return 0;
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}
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|
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/*
|
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* Some firmware has serious problems when using more than 50% of the EFI
|
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* variable store, i.e. it triggers bugs that can brick machines. Ensure that
|
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* we never use more than this safe limit.
|
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*
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* Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
|
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* store.
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*/
|
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efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
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{
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efi_status_t status;
|
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u64 storage_size, remaining_size, max_size;
|
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|
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status = efi.query_variable_info(attributes, &storage_size,
|
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&remaining_size, &max_size);
|
||||
if (status != EFI_SUCCESS)
|
||||
return status;
|
||||
|
||||
if (!max_size && remaining_size > size)
|
||||
printk_once(KERN_ERR FW_BUG "Broken EFI implementation"
|
||||
" is returning MaxVariableSize=0\n");
|
||||
/*
|
||||
* Some firmware implementations refuse to boot if there's insufficient
|
||||
* space in the variable store. We account for that by refusing the
|
||||
* write if permitting it would reduce the available space to under
|
||||
* 50%. However, some firmware won't reclaim variable space until
|
||||
* after the used (not merely the actively used) space drops below
|
||||
* a threshold. We can approximate that case with the value calculated
|
||||
* above. If both the firmware and our calculations indicate that the
|
||||
* available space would drop below 50%, refuse the write.
|
||||
*/
|
||||
|
||||
if (!storage_size || size > remaining_size ||
|
||||
(max_size && size > max_size))
|
||||
return EFI_OUT_OF_RESOURCES;
|
||||
|
||||
if (!efi_no_storage_paranoia &&
|
||||
((active_size + size + VAR_METADATA_SIZE > storage_size / 2) &&
|
||||
(remaining_size - size < storage_size / 2)))
|
||||
return EFI_OUT_OF_RESOURCES;
|
||||
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(efi_query_variable_store);
|
||||
|
||||
@ -39,6 +39,7 @@ config FIRMWARE_MEMMAP
|
||||
config EFI_VARS
|
||||
tristate "EFI Variable Support via sysfs"
|
||||
depends on EFI
|
||||
select UCS2_STRING
|
||||
default n
|
||||
help
|
||||
If you say Y here, you are able to get EFI (Extensible Firmware
|
||||
|
||||
@ -80,6 +80,7 @@
|
||||
#include <linux/slab.h>
|
||||
#include <linux/pstore.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/ucs2_string.h>
|
||||
|
||||
#include <linux/fs.h>
|
||||
#include <linux/ramfs.h>
|
||||
@ -172,51 +173,6 @@ static void efivar_update_sysfs_entries(struct work_struct *);
|
||||
static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
|
||||
static bool efivar_wq_enabled = true;
|
||||
|
||||
/* Return the number of unicode characters in data */
|
||||
static unsigned long
|
||||
utf16_strnlen(efi_char16_t *s, size_t maxlength)
|
||||
{
|
||||
unsigned long length = 0;
|
||||
|
||||
while (*s++ != 0 && length < maxlength)
|
||||
length++;
|
||||
return length;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
utf16_strlen(efi_char16_t *s)
|
||||
{
|
||||
return utf16_strnlen(s, ~0UL);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the number of bytes is the length of this string
|
||||
* Note: this is NOT the same as the number of unicode characters
|
||||
*/
|
||||
static inline unsigned long
|
||||
utf16_strsize(efi_char16_t *data, unsigned long maxlength)
|
||||
{
|
||||
return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);
|
||||
}
|
||||
|
||||
static inline int
|
||||
utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len)
|
||||
{
|
||||
while (1) {
|
||||
if (len == 0)
|
||||
return 0;
|
||||
if (*a < *b)
|
||||
return -1;
|
||||
if (*a > *b)
|
||||
return 1;
|
||||
if (*a == 0) /* implies *b == 0 */
|
||||
return 0;
|
||||
a++;
|
||||
b++;
|
||||
len--;
|
||||
}
|
||||
}
|
||||
|
||||
static bool
|
||||
validate_device_path(struct efi_variable *var, int match, u8 *buffer,
|
||||
unsigned long len)
|
||||
@ -268,7 +224,7 @@ validate_load_option(struct efi_variable *var, int match, u8 *buffer,
|
||||
u16 filepathlength;
|
||||
int i, desclength = 0, namelen;
|
||||
|
||||
namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName));
|
||||
namelen = ucs2_strnlen(var->VariableName, sizeof(var->VariableName));
|
||||
|
||||
/* Either "Boot" or "Driver" followed by four digits of hex */
|
||||
for (i = match; i < match+4; i++) {
|
||||
@ -291,7 +247,7 @@ validate_load_option(struct efi_variable *var, int match, u8 *buffer,
|
||||
* There's no stored length for the description, so it has to be
|
||||
* found by hand
|
||||
*/
|
||||
desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
|
||||
desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
|
||||
|
||||
/* Each boot entry must have a descriptor */
|
||||
if (!desclength)
|
||||
@ -436,24 +392,12 @@ static efi_status_t
|
||||
check_var_size_locked(struct efivars *efivars, u32 attributes,
|
||||
unsigned long size)
|
||||
{
|
||||
u64 storage_size, remaining_size, max_size;
|
||||
efi_status_t status;
|
||||
const struct efivar_operations *fops = efivars->ops;
|
||||
|
||||
if (!efivars->ops->query_variable_info)
|
||||
if (!efivars->ops->query_variable_store)
|
||||
return EFI_UNSUPPORTED;
|
||||
|
||||
status = fops->query_variable_info(attributes, &storage_size,
|
||||
&remaining_size, &max_size);
|
||||
|
||||
if (status != EFI_SUCCESS)
|
||||
return status;
|
||||
|
||||
if (!storage_size || size > remaining_size || size > max_size ||
|
||||
(remaining_size - size) < (storage_size / 2))
|
||||
return EFI_OUT_OF_RESOURCES;
|
||||
|
||||
return status;
|
||||
return fops->query_variable_store(attributes, size);
|
||||
}
|
||||
|
||||
|
||||
@ -593,7 +537,7 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
|
||||
spin_lock_irq(&efivars->lock);
|
||||
|
||||
status = check_var_size_locked(efivars, new_var->Attributes,
|
||||
new_var->DataSize + utf16_strsize(new_var->VariableName, 1024));
|
||||
new_var->DataSize + ucs2_strsize(new_var->VariableName, 1024));
|
||||
|
||||
if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED)
|
||||
status = efivars->ops->set_variable(new_var->VariableName,
|
||||
@ -771,7 +715,7 @@ static ssize_t efivarfs_file_write(struct file *file,
|
||||
* QueryVariableInfo() isn't supported by the firmware.
|
||||
*/
|
||||
|
||||
varsize = datasize + utf16_strsize(var->var.VariableName, 1024);
|
||||
varsize = datasize + ucs2_strsize(var->var.VariableName, 1024);
|
||||
status = check_var_size(efivars, attributes, varsize);
|
||||
|
||||
if (status != EFI_SUCCESS) {
|
||||
@ -1223,7 +1167,7 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
|
||||
|
||||
inode = NULL;
|
||||
|
||||
len = utf16_strlen(entry->var.VariableName);
|
||||
len = ucs2_strlen(entry->var.VariableName);
|
||||
|
||||
/* name, plus '-', plus GUID, plus NUL*/
|
||||
name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC);
|
||||
@ -1481,8 +1425,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
|
||||
|
||||
if (efi_guidcmp(entry->var.VendorGuid, vendor))
|
||||
continue;
|
||||
if (utf16_strncmp(entry->var.VariableName, efi_name,
|
||||
utf16_strlen(efi_name))) {
|
||||
if (ucs2_strncmp(entry->var.VariableName, efi_name,
|
||||
ucs2_strlen(efi_name))) {
|
||||
/*
|
||||
* Check if an old format,
|
||||
* which doesn't support holding
|
||||
@ -1494,8 +1438,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
|
||||
for (i = 0; i < DUMP_NAME_LEN; i++)
|
||||
efi_name_old[i] = name_old[i];
|
||||
|
||||
if (utf16_strncmp(entry->var.VariableName, efi_name_old,
|
||||
utf16_strlen(efi_name_old)))
|
||||
if (ucs2_strncmp(entry->var.VariableName, efi_name_old,
|
||||
ucs2_strlen(efi_name_old)))
|
||||
continue;
|
||||
}
|
||||
|
||||
@ -1573,8 +1517,8 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
|
||||
* Does this variable already exist?
|
||||
*/
|
||||
list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
|
||||
strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
|
||||
strsize2 = utf16_strsize(new_var->VariableName, 1024);
|
||||
strsize1 = ucs2_strsize(search_efivar->var.VariableName, 1024);
|
||||
strsize2 = ucs2_strsize(new_var->VariableName, 1024);
|
||||
if (strsize1 == strsize2 &&
|
||||
!memcmp(&(search_efivar->var.VariableName),
|
||||
new_var->VariableName, strsize1) &&
|
||||
@ -1590,7 +1534,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
|
||||
}
|
||||
|
||||
status = check_var_size_locked(efivars, new_var->Attributes,
|
||||
new_var->DataSize + utf16_strsize(new_var->VariableName, 1024));
|
||||
new_var->DataSize + ucs2_strsize(new_var->VariableName, 1024));
|
||||
|
||||
if (status && status != EFI_UNSUPPORTED) {
|
||||
spin_unlock_irq(&efivars->lock);
|
||||
@ -1614,7 +1558,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
|
||||
|
||||
/* Create the entry in sysfs. Locking is not required here */
|
||||
status = efivar_create_sysfs_entry(efivars,
|
||||
utf16_strsize(new_var->VariableName,
|
||||
ucs2_strsize(new_var->VariableName,
|
||||
1024),
|
||||
new_var->VariableName,
|
||||
&new_var->VendorGuid);
|
||||
@ -1644,8 +1588,8 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
|
||||
* Does this variable already exist?
|
||||
*/
|
||||
list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
|
||||
strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
|
||||
strsize2 = utf16_strsize(del_var->VariableName, 1024);
|
||||
strsize1 = ucs2_strsize(search_efivar->var.VariableName, 1024);
|
||||
strsize2 = ucs2_strsize(del_var->VariableName, 1024);
|
||||
if (strsize1 == strsize2 &&
|
||||
!memcmp(&(search_efivar->var.VariableName),
|
||||
del_var->VariableName, strsize1) &&
|
||||
@ -1691,9 +1635,9 @@ static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor)
|
||||
unsigned long strsize1, strsize2;
|
||||
bool found = false;
|
||||
|
||||
strsize1 = utf16_strsize(variable_name, 1024);
|
||||
strsize1 = ucs2_strsize(variable_name, 1024);
|
||||
list_for_each_entry_safe(entry, n, &efivars->list, list) {
|
||||
strsize2 = utf16_strsize(entry->var.VariableName, 1024);
|
||||
strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
|
||||
if (strsize1 == strsize2 &&
|
||||
!memcmp(variable_name, &(entry->var.VariableName),
|
||||
strsize2) &&
|
||||
@ -2131,7 +2075,7 @@ efivars_init(void)
|
||||
ops.get_variable = efi.get_variable;
|
||||
ops.set_variable = efi.set_variable;
|
||||
ops.get_next_variable = efi.get_next_variable;
|
||||
ops.query_variable_info = efi.query_variable_info;
|
||||
ops.query_variable_store = efi_query_variable_store;
|
||||
|
||||
error = register_efivars(&__efivars, &ops, efi_kobj);
|
||||
if (error)
|
||||
|
||||
@ -333,6 +333,7 @@ typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
|
||||
unsigned long count,
|
||||
u64 *max_size,
|
||||
int *reset_type);
|
||||
typedef efi_status_t efi_query_variable_store_t(u32 attributes, unsigned long size);
|
||||
|
||||
/*
|
||||
* EFI Configuration Table and GUID definitions
|
||||
@ -575,9 +576,15 @@ extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if pos
|
||||
#ifdef CONFIG_X86
|
||||
extern void efi_late_init(void);
|
||||
extern void efi_free_boot_services(void);
|
||||
extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size);
|
||||
#else
|
||||
static inline void efi_late_init(void) {}
|
||||
static inline void efi_free_boot_services(void) {}
|
||||
|
||||
static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
|
||||
{
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
#endif
|
||||
extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
|
||||
extern u64 efi_get_iobase (void);
|
||||
@ -731,7 +738,7 @@ struct efivar_operations {
|
||||
efi_get_variable_t *get_variable;
|
||||
efi_get_next_variable_t *get_next_variable;
|
||||
efi_set_variable_t *set_variable;
|
||||
efi_query_variable_info_t *query_variable_info;
|
||||
efi_query_variable_store_t *query_variable_store;
|
||||
};
|
||||
|
||||
struct efivars {
|
||||
|
||||
14
include/linux/ucs2_string.h
Normal file
14
include/linux/ucs2_string.h
Normal file
@ -0,0 +1,14 @@
|
||||
#ifndef _LINUX_UCS2_STRING_H_
|
||||
#define _LINUX_UCS2_STRING_H_
|
||||
|
||||
#include <linux/types.h> /* for size_t */
|
||||
#include <linux/stddef.h> /* for NULL */
|
||||
|
||||
typedef u16 ucs2_char_t;
|
||||
|
||||
unsigned long ucs2_strnlen(const ucs2_char_t *s, size_t maxlength);
|
||||
unsigned long ucs2_strlen(const ucs2_char_t *s);
|
||||
unsigned long ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength);
|
||||
int ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len);
|
||||
|
||||
#endif /* _LINUX_UCS2_STRING_H_ */
|
||||
@ -404,4 +404,7 @@ config OID_REGISTRY
|
||||
help
|
||||
Enable fast lookup object identifier registry.
|
||||
|
||||
config UCS2_STRING
|
||||
tristate
|
||||
|
||||
endmenu
|
||||
|
||||
@ -174,3 +174,5 @@ quiet_cmd_build_OID_registry = GEN $@
|
||||
cmd_build_OID_registry = perl $(srctree)/$(src)/build_OID_registry $< $@
|
||||
|
||||
clean-files += oid_registry_data.c
|
||||
|
||||
obj-$(CONFIG_UCS2_STRING) += ucs2_string.o
|
||||
|
||||
51
lib/ucs2_string.c
Normal file
51
lib/ucs2_string.c
Normal file
@ -0,0 +1,51 @@
|
||||
#include <linux/ucs2_string.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
/* Return the number of unicode characters in data */
|
||||
unsigned long
|
||||
ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
|
||||
{
|
||||
unsigned long length = 0;
|
||||
|
||||
while (*s++ != 0 && length < maxlength)
|
||||
length++;
|
||||
return length;
|
||||
}
|
||||
EXPORT_SYMBOL(ucs2_strnlen);
|
||||
|
||||
unsigned long
|
||||
ucs2_strlen(const ucs2_char_t *s)
|
||||
{
|
||||
return ucs2_strnlen(s, ~0UL);
|
||||
}
|
||||
EXPORT_SYMBOL(ucs2_strlen);
|
||||
|
||||
/*
|
||||
* Return the number of bytes is the length of this string
|
||||
* Note: this is NOT the same as the number of unicode characters
|
||||
*/
|
||||
unsigned long
|
||||
ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
|
||||
{
|
||||
return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
|
||||
}
|
||||
EXPORT_SYMBOL(ucs2_strsize);
|
||||
|
||||
int
|
||||
ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
|
||||
{
|
||||
while (1) {
|
||||
if (len == 0)
|
||||
return 0;
|
||||
if (*a < *b)
|
||||
return -1;
|
||||
if (*a > *b)
|
||||
return 1;
|
||||
if (*a == 0) /* implies *b == 0 */
|
||||
return 0;
|
||||
a++;
|
||||
b++;
|
||||
len--;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(ucs2_strncmp);
|
||||
Loading…
Reference in New Issue
Block a user