Format: {"off" | "on" | "skip[mbr]"}
efi= [EFI]
- Format: { "old_map" }
+ Format: { "old_map", "nochunk", "noruntime" }
old_map [X86-64]: switch to the old ioremap-based EFI
runtime services mapping. 32-bit still uses this one by
default.
+ nochunk: disable reading files in "chunks" in the EFI
+ boot stub, as chunking can cause problems with some
+ firmware implementations.
+ noruntime : disable EFI runtime services support
efi_no_storage_paranoia [EFI; X86]
Using this parameter you can use more than 50% of
nodsp [SH] Disable hardware DSP at boot time.
- noefi [X86] Disable EFI runtime services support.
+ noefi Disable EFI runtime services support.
noexec [IA-64]
*/
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
pr_err("System table signature incorrect\n");
- return -EINVAL;
+ retval = -EINVAL;
+ goto out;
}
if ((efi.systab->hdr.revision >> 16) < 2)
pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
vendor[i] = c16[i];
vendor[i] = '\0';
+ early_memunmap(c16, sizeof(vendor));
}
pr_info("EFI v%u.%.02u by %s\n",
if (retval == 0)
set_bit(EFI_CONFIG_TABLES, &efi.flags);
- early_memunmap(c16, sizeof(vendor));
+out:
early_memunmap(efi.systab, sizeof(efi_system_table_t));
-
return retval;
}
-static __initdata char memory_type_name[][32] = {
- {"Reserved"},
- {"Loader Code"},
- {"Loader Data"},
- {"Boot Code"},
- {"Boot Data"},
- {"Runtime Code"},
- {"Runtime Data"},
- {"Conventional Memory"},
- {"Unusable Memory"},
- {"ACPI Reclaim Memory"},
- {"ACPI Memory NVS"},
- {"Memory Mapped I/O"},
- {"MMIO Port Space"},
- {"PAL Code"},
-};
-
/*
* Return true for RAM regions we want to permanently reserve.
*/
paddr = md->phys_addr;
npages = md->num_pages;
- if (uefi_debug)
- pr_info(" 0x%012llx-0x%012llx [%s]",
+ if (uefi_debug) {
+ char buf[64];
+
+ pr_info(" 0x%012llx-0x%012llx %s",
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
- memory_type_name[md->type]);
+ efi_md_typeattr_format(buf, sizeof(buf), md));
+ }
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
return -1;
}
- pr_info("Remapping and enabling EFI services.\n");
-
- /* replace early memmap mapping with permanent mapping */
mapsize = memmap.map_end - memmap.map;
early_memunmap(memmap.map, mapsize);
+
+ if (efi_runtime_disabled()) {
+ pr_info("EFI runtime services will be disabled.\n");
+ return -1;
+ }
+
+ pr_info("Remapping and enabling EFI services.\n");
+ /* replace early memmap mapping with permanent mapping */
memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
mapsize);
memmap.map_end = memmap.map + mapsize;
{
const char *unit;
unsigned long size;
+ char buf[64];
md = p;
size = md->num_pages << EFI_PAGE_SHIFT;
unit = "KB";
}
- printk("mem%02d: type=%2u, attr=0x%016lx, "
+ printk("mem%02d: %s "
"range=[0x%016lx-0x%016lx) (%4lu%s)\n",
- i, md->type, md->attribute, md->phys_addr,
+ i, efi_md_typeattr_format(buf, sizeof(buf), md),
+ md->phys_addr,
md->phys_addr + efi_md_size(md), size, unit);
}
}
size = pci->romsize + sizeof(*rom);
status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to alloc mem for rom\n");
return status;
+ }
memset(rom, 0, sizeof(*rom));
status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
PCI_VENDOR_ID, 1, &(rom->vendor));
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to read rom->vendor\n");
goto free_struct;
+ }
status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
PCI_DEVICE_ID, 1, &(rom->devid));
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to read rom->devid\n");
goto free_struct;
+ }
status = efi_early->call(pci->get_location, pci, &(rom->segment),
&(rom->bus), &(rom->device), &(rom->function));
size = pci->romsize + sizeof(*rom);
status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to alloc mem for rom\n");
return status;
+ }
rom->data.type = SETUP_PCI;
rom->data.len = size - sizeof(struct setup_data);
status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
PCI_VENDOR_ID, 1, &(rom->vendor));
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to read rom->vendor\n");
goto free_struct;
+ }
status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
PCI_DEVICE_ID, 1, &(rom->devid));
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to read rom->devid\n");
goto free_struct;
+ }
status = efi_early->call(pci->get_location, pci, &(rom->segment),
&(rom->bus), &(rom->device), &(rom->function));
EFI_LOADER_DATA,
size, (void **)&pci_handle);
- if (status != EFI_SUCCESS)
+ if (status != EFI_SUCCESS) {
+ efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
return;
+ }
status = efi_call_early(locate_handle,
EFI_LOCATE_BY_PROTOCOL, &pci_proto,
memset(sdt, 0, sizeof(*sdt));
+ status = efi_parse_options(cmdline_ptr);
+ if (status != EFI_SUCCESS)
+ goto fail2;
+
status = handle_cmdline_files(sys_table, image,
(char *)(unsigned long)hdr->cmd_line_ptr,
"initrd=", hdr->initrd_addr_max,
*/
#define __efi_call_virt(f, args...) efi_call_virt(f, args)
-extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
- u32 type, u64 attribute);
+extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
+ u32 type, u64 attribute);
#endif /* CONFIG_X86_32 */
-extern int add_efi_memmap;
extern struct efi_scratch efi_scratch;
-extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
-extern int efi_memblock_x86_reserve_range(void);
-extern void efi_call_phys_prelog(void);
-extern void efi_call_phys_epilog(void);
-extern void efi_unmap_memmap(void);
-extern void efi_memory_uc(u64 addr, unsigned long size);
+extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
+extern int __init efi_memblock_x86_reserve_range(void);
+extern void __init efi_call_phys_prolog(void);
+extern void __init efi_call_phys_epilog(void);
+extern void __init efi_unmap_memmap(void);
+extern void __init efi_memory_uc(u64 addr, unsigned long size);
extern void __init efi_map_region(efi_memory_desc_t *md);
extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
extern void efi_sync_low_kernel_mappings(void);
-extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
-extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
+extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
+extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
extern void __init old_map_region(efi_memory_desc_t *md);
extern void __init runtime_code_page_mkexec(void);
extern void __init efi_runtime_mkexec(void);
extern bool efi_reboot_required(void);
#else
-/*
- * IF EFI is not configured, have the EFI calls return -ENOSYS.
- */
-#define efi_call0(_f) (-ENOSYS)
-#define efi_call1(_f, _a1) (-ENOSYS)
-#define efi_call2(_f, _a1, _a2) (-ENOSYS)
-#define efi_call3(_f, _a1, _a2, _a3) (-ENOSYS)
-#define efi_call4(_f, _a1, _a2, _a3, _a4) (-ENOSYS)
-#define efi_call5(_f, _a1, _a2, _a3, _a4, _a5) (-ENOSYS)
-#define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6) (-ENOSYS)
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
static inline bool efi_reboot_required(void)
{
if (ACPI_FAILURE(status))
return;
- if (bgrt_tab->header.length < sizeof(*bgrt_tab))
+ if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
+ pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
+ bgrt_tab->header.length, sizeof(*bgrt_tab));
return;
- if (bgrt_tab->version != 1 || bgrt_tab->status != 1)
+ }
+ if (bgrt_tab->version != 1) {
+ pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
+ bgrt_tab->version);
+ return;
+ }
+ if (bgrt_tab->status != 1) {
+ pr_err("Ignoring BGRT: invalid status %u (expected 1)\n",
+ bgrt_tab->status);
+ return;
+ }
+ if (bgrt_tab->image_type != 0) {
+ pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
+ bgrt_tab->image_type);
return;
- if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)
+ }
+ if (!bgrt_tab->image_address) {
+ pr_err("Ignoring BGRT: null image address\n");
return;
+ }
image = efi_lookup_mapped_addr(bgrt_tab->image_address);
if (!image) {
image = early_memremap(bgrt_tab->image_address,
sizeof(bmp_header));
ioremapped = true;
- if (!image)
+ if (!image) {
+ pr_err("Ignoring BGRT: failed to map image header memory\n");
return;
+ }
}
memcpy_fromio(&bmp_header, image, sizeof(bmp_header));
early_iounmap(image, sizeof(bmp_header));
bgrt_image_size = bmp_header.size;
- bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL);
- if (!bgrt_image)
+ bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
+ if (!bgrt_image) {
+ pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
+ bgrt_image_size);
return;
+ }
if (ioremapped) {
image = early_memremap(bgrt_tab->image_address,
bmp_header.size);
if (!image) {
+ pr_err("Ignoring BGRT: failed to map image memory\n");
kfree(bgrt_image);
bgrt_image = NULL;
return;
u64 efi_setup; /* efi setup_data physical address */
-static bool disable_runtime __initdata = false;
-static int __init setup_noefi(char *arg)
-{
- disable_runtime = true;
- return 0;
-}
-early_param("noefi", setup_noefi);
-
-int add_efi_memmap;
-EXPORT_SYMBOL(add_efi_memmap);
-
+static int add_efi_memmap __initdata;
static int __init setup_add_efi_memmap(char *arg)
{
add_efi_memmap = 1;
{
efi_status_t status;
- efi_call_phys_prelog();
+ efi_call_phys_prolog();
status = efi_call_phys(efi_phys.set_virtual_address_map,
memory_map_size, descriptor_size,
descriptor_version, virtual_map);
for (p = memmap.map, i = 0;
p < memmap.map_end;
p += memmap.desc_size, i++) {
+ char buf[64];
+
md = p;
- pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
- i, md->type, md->attribute, md->phys_addr,
+ pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n",
+ i, efi_md_typeattr_format(buf, sizeof(buf), md),
+ md->phys_addr,
md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
}
}
/*
- * We will only need *early* access to the following two
- * EFI runtime services before set_virtual_address_map
- * is invoked.
+ * We will only need *early* access to the SetVirtualAddressMap
+ * EFI runtime service. All other runtime services will be called
+ * via the virtual mapping.
*/
efi_phys.set_virtual_address_map =
(efi_set_virtual_address_map_t *)
}
/*
- * We will only need *early* access to the following two
- * EFI runtime services before set_virtual_address_map
- * is invoked.
+ * We will only need *early* access to the SetVirtualAddressMap
+ * EFI runtime service. All other runtime services will be called
+ * via the virtual mapping.
*/
efi_phys.set_virtual_address_map =
(efi_set_virtual_address_map_t *)
if (!efi_runtime_supported())
pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
else {
- if (disable_runtime || efi_runtime_init())
+ if (efi_runtime_disabled() || efi_runtime_init())
return;
}
if (efi_memmap_init())
}
}
-void efi_memory_uc(u64 addr, unsigned long size)
+void __init efi_memory_uc(u64 addr, unsigned long size)
{
unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
u64 npages;
*/
if (!efi_is_native()) {
efi_unmap_memmap();
+ clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return;
}
new_memmap = efi_map_regions(&count, &pg_shift);
if (!new_memmap) {
pr_err("Error reallocating memory, EFI runtime non-functional!\n");
+ clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return;
}
BUG_ON(!efi.systab);
- if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
+ if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
+ clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return;
+ }
efi_sync_low_kernel_mappings();
efi_dump_pagetable();
return 0;
}
-static int __init parse_efi_cmdline(char *str)
+static int __init arch_parse_efi_cmdline(char *str)
{
- if (*str == '=')
- str++;
-
- if (!strncmp(str, "old_map", 7))
+ if (parse_option_str(str, "old_map"))
set_bit(EFI_OLD_MEMMAP, &efi.flags);
return 0;
}
-early_param("efi", parse_efi_cmdline);
+early_param("efi", arch_parse_efi_cmdline);
/*
* To make EFI call EFI runtime service in physical addressing mode we need
- * prelog/epilog before/after the invocation to disable interrupt, to
+ * prolog/epilog before/after the invocation to disable interrupt, to
* claim EFI runtime service handler exclusively and to duplicate a memory in
* low memory space say 0 - 3G.
*/
void efi_sync_low_kernel_mappings(void) {}
void __init efi_dump_pagetable(void) {}
-int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
return 0;
}
-void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages) {}
+void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+{
+}
void __init efi_map_region(efi_memory_desc_t *md)
{
void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
-void efi_call_phys_prelog(void)
+void __init efi_call_phys_prolog(void)
{
struct desc_ptr gdt_descr;
load_gdt(&gdt_descr);
}
-void efi_call_phys_epilog(void)
+void __init efi_call_phys_epilog(void)
{
struct desc_ptr gdt_descr;
}
}
-void __init efi_call_phys_prelog(void)
+void __init efi_call_phys_prolog(void)
{
unsigned long vaddress;
int pgd;
sizeof(pgd_t) * num_pgds);
}
-int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
unsigned long text;
struct page *page;
return 0;
}
-void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
* set to 0x0010, DS and SS have been set to 0x0018. In EFI, I found
* the values of these registers are the same. And, the corresponding
* GDT entries are identical. So I will do nothing about segment reg
- * and GDT, but change GDT base register in prelog and epilog.
+ * and GDT, but change GDT base register in prolog and epilog.
*/
/*
* 1. Now I am running with EIP = <physical address> + PAGE_OFFSET.
* But to make it smoothly switch from virtual mode to flat mode.
- * The mapping of lower virtual memory has been created in prelog and
+ * The mapping of lower virtual memory has been created in prolog and
* epilog.
*/
movl $1f, %edx
};
EXPORT_SYMBOL(efi);
+static bool disable_runtime;
+static int __init setup_noefi(char *arg)
+{
+ disable_runtime = true;
+ return 0;
+}
+early_param("noefi", setup_noefi);
+
+bool efi_runtime_disabled(void)
+{
+ return disable_runtime;
+}
+
+static int __init parse_efi_cmdline(char *str)
+{
+ if (parse_option_str(str, "noruntime"))
+ disable_runtime = true;
+
+ return 0;
+}
+early_param("efi", parse_efi_cmdline);
+
static struct kobject *efi_kobj;
static struct kobject *efivars_kobj;
return ret;
}
#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
+
+static __initdata char memory_type_name[][20] = {
+ "Reserved",
+ "Loader Code",
+ "Loader Data",
+ "Boot Code",
+ "Boot Data",
+ "Runtime Code",
+ "Runtime Data",
+ "Conventional Memory",
+ "Unusable Memory",
+ "ACPI Reclaim Memory",
+ "ACPI Memory NVS",
+ "Memory Mapped I/O",
+ "MMIO Port Space",
+ "PAL Code"
+};
+
+char * __init efi_md_typeattr_format(char *buf, size_t size,
+ const efi_memory_desc_t *md)
+{
+ char *pos;
+ int type_len;
+ u64 attr;
+
+ pos = buf;
+ if (md->type >= ARRAY_SIZE(memory_type_name))
+ type_len = snprintf(pos, size, "[type=%u", md->type);
+ else
+ type_len = snprintf(pos, size, "[%-*s",
+ (int)(sizeof(memory_type_name[0]) - 1),
+ memory_type_name[md->type]);
+ if (type_len >= size)
+ return buf;
+
+ pos += type_len;
+ size -= type_len;
+
+ attr = md->attribute;
+ if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
+ EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_WP |
+ EFI_MEMORY_RP | EFI_MEMORY_XP | EFI_MEMORY_RUNTIME))
+ snprintf(pos, size, "|attr=0x%016llx]",
+ (unsigned long long)attr);
+ else
+ snprintf(pos, size, "|%3s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
+ attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
+ attr & EFI_MEMORY_XP ? "XP" : "",
+ attr & EFI_MEMORY_RP ? "RP" : "",
+ attr & EFI_MEMORY_WP ? "WP" : "",
+ attr & EFI_MEMORY_UCE ? "UCE" : "",
+ attr & EFI_MEMORY_WB ? "WB" : "",
+ attr & EFI_MEMORY_WT ? "WT" : "",
+ attr & EFI_MEMORY_WC ? "WC" : "",
+ attr & EFI_MEMORY_UC ? "UC" : "");
+ return buf;
+}
goto fail_free_image;
}
+ status = efi_parse_options(cmdline_ptr);
+ if (status != EFI_SUCCESS)
+ pr_efi_err(sys_table, "Failed to parse EFI cmdline options\n");
+
/*
* Unauthenticated device tree data is a security hazard, so
* ignore 'dtb=' unless UEFI Secure Boot is disabled.
#include "efistub.h"
+/*
+ * Some firmware implementations have problems reading files in one go.
+ * A read chunk size of 1MB seems to work for most platforms.
+ *
+ * Unfortunately, reading files in chunks triggers *other* bugs on some
+ * platforms, so we provide a way to disable this workaround, which can
+ * be done by passing "efi=nochunk" on the EFI boot stub command line.
+ *
+ * If you experience issues with initrd images being corrupt it's worth
+ * trying efi=nochunk, but chunking is enabled by default because there
+ * are far more machines that require the workaround than those that
+ * break with it enabled.
+ */
#define EFI_READ_CHUNK_SIZE (1024 * 1024)
+static unsigned long __chunk_size = EFI_READ_CHUNK_SIZE;
+
struct file_info {
efi_file_handle_t *handle;
u64 size;
efi_call_early(free_pages, addr, nr_pages);
}
+/*
+ * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi=
+ * option, e.g. efi=nochunk.
+ *
+ * It should be noted that efi= is parsed in two very different
+ * environments, first in the early boot environment of the EFI boot
+ * stub, and subsequently during the kernel boot.
+ */
+efi_status_t efi_parse_options(char *cmdline)
+{
+ char *str;
+
+ /*
+ * If no EFI parameters were specified on the cmdline we've got
+ * nothing to do.
+ */
+ str = strstr(cmdline, "efi=");
+ if (!str)
+ return EFI_SUCCESS;
+
+ /* Skip ahead to first argument */
+ str += strlen("efi=");
+
+ /*
+ * Remember, because efi= is also used by the kernel we need to
+ * skip over arguments we don't understand.
+ */
+ while (*str) {
+ if (!strncmp(str, "nochunk", 7)) {
+ str += strlen("nochunk");
+ __chunk_size = -1UL;
+ }
+
+ /* Group words together, delimited by "," */
+ while (*str && *str != ',')
+ str++;
+
+ if (*str == ',')
+ str++;
+ }
+
+ return EFI_SUCCESS;
+}
/*
* Check the cmdline for a LILO-style file= arguments.
size = files[j].size;
while (size) {
unsigned long chunksize;
- if (size > EFI_READ_CHUNK_SIZE)
- chunksize = EFI_READ_CHUNK_SIZE;
+ if (size > __chunk_size)
+ chunksize = __chunk_size;
else
chunksize = size;
* This file is released under the GPLv2.
*/
+#include <linux/bug.h>
#include <linux/efi.h>
-#include <linux/spinlock.h> /* spinlock_t */
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
#include <asm/efi.h>
+/*
+ * According to section 7.1 of the UEFI spec, Runtime Services are not fully
+ * reentrant, and there are particular combinations of calls that need to be
+ * serialized. (source: UEFI Specification v2.4A)
+ *
+ * Table 31. Rules for Reentry Into Runtime Services
+ * +------------------------------------+-------------------------------+
+ * | If previous call is busy in | Forbidden to call |
+ * +------------------------------------+-------------------------------+
+ * | Any | SetVirtualAddressMap() |
+ * +------------------------------------+-------------------------------+
+ * | ConvertPointer() | ConvertPointer() |
+ * +------------------------------------+-------------------------------+
+ * | SetVariable() | ResetSystem() |
+ * | UpdateCapsule() | |
+ * | SetTime() | |
+ * | SetWakeupTime() | |
+ * | GetNextHighMonotonicCount() | |
+ * +------------------------------------+-------------------------------+
+ * | GetVariable() | GetVariable() |
+ * | GetNextVariableName() | GetNextVariableName() |
+ * | SetVariable() | SetVariable() |
+ * | QueryVariableInfo() | QueryVariableInfo() |
+ * | UpdateCapsule() | UpdateCapsule() |
+ * | QueryCapsuleCapabilities() | QueryCapsuleCapabilities() |
+ * | GetNextHighMonotonicCount() | GetNextHighMonotonicCount() |
+ * +------------------------------------+-------------------------------+
+ * | GetTime() | GetTime() |
+ * | SetTime() | SetTime() |
+ * | GetWakeupTime() | GetWakeupTime() |
+ * | SetWakeupTime() | SetWakeupTime() |
+ * +------------------------------------+-------------------------------+
+ *
+ * Due to the fact that the EFI pstore may write to the variable store in
+ * interrupt context, we need to use a spinlock for at least the groups that
+ * contain SetVariable() and QueryVariableInfo(). That leaves little else, as
+ * none of the remaining functions are actually ever called at runtime.
+ * So let's just use a single spinlock to serialize all Runtime Services calls.
+ */
+static DEFINE_SPINLOCK(efi_runtime_lock);
+
+/*
+ * Some runtime services calls can be reentrant under NMI, even if the table
+ * above says they are not. (source: UEFI Specification v2.4A)
+ *
+ * Table 32. Functions that may be called after Machine Check, INIT and NMI
+ * +----------------------------+------------------------------------------+
+ * | Function | Called after Machine Check, INIT and NMI |
+ * +----------------------------+------------------------------------------+
+ * | GetTime() | Yes, even if previously busy. |
+ * | GetVariable() | Yes, even if previously busy |
+ * | GetNextVariableName() | Yes, even if previously busy |
+ * | QueryVariableInfo() | Yes, even if previously busy |
+ * | SetVariable() | Yes, even if previously busy |
+ * | UpdateCapsule() | Yes, even if previously busy |
+ * | QueryCapsuleCapabilities() | Yes, even if previously busy |
+ * | ResetSystem() | Yes, even if previously busy |
+ * +----------------------------+------------------------------------------+
+ *
+ * In order to prevent deadlocks under NMI, the wrappers for these functions
+ * may only grab the efi_runtime_lock or rtc_lock spinlocks if !efi_in_nmi().
+ * However, not all of the services listed are reachable through NMI code paths,
+ * so the the special handling as suggested by the UEFI spec is only implemented
+ * for QueryVariableInfo() and SetVariable(), as these can be reached in NMI
+ * context through efi_pstore_write().
+ */
+
/*
* As per commit ef68c8f87ed1 ("x86: Serialize EFI time accesses on rtc_lock"),
* the EFI specification requires that callers of the time related runtime
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock(&efi_runtime_lock);
status = efi_call_virt(get_time, tm, tc);
+ spin_unlock(&efi_runtime_lock);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock(&efi_runtime_lock);
status = efi_call_virt(set_time, tm);
+ spin_unlock(&efi_runtime_lock);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock(&efi_runtime_lock);
status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
+ spin_unlock(&efi_runtime_lock);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock(&efi_runtime_lock);
status = efi_call_virt(set_wakeup_time, enabled, tm);
+ spin_unlock(&efi_runtime_lock);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
unsigned long *data_size,
void *data)
{
- return efi_call_virt(get_variable, name, vendor, attr, data_size, data);
+ unsigned long flags;
+ efi_status_t status;
+
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(get_variable, name, vendor, attr, data_size,
+ data);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
efi_char16_t *name,
efi_guid_t *vendor)
{
- return efi_call_virt(get_next_variable, name_size, name, vendor);
+ unsigned long flags;
+ efi_status_t status;
+
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(get_next_variable, name_size, name, vendor);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
static efi_status_t virt_efi_set_variable(efi_char16_t *name,
unsigned long data_size,
void *data)
{
- return efi_call_virt(set_variable, name, vendor, attr, data_size, data);
+ unsigned long flags;
+ efi_status_t status;
+
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(set_variable, name, vendor, attr, data_size,
+ data);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
+static efi_status_t
+virt_efi_set_variable_nonblocking(efi_char16_t *name, efi_guid_t *vendor,
+ u32 attr, unsigned long data_size,
+ void *data)
+{
+ unsigned long flags;
+ efi_status_t status;
+
+ if (!spin_trylock_irqsave(&efi_runtime_lock, flags))
+ return EFI_NOT_READY;
+
+ status = efi_call_virt(set_variable, name, vendor, attr, data_size,
+ data);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
+}
+
+
static efi_status_t virt_efi_query_variable_info(u32 attr,
u64 *storage_space,
u64 *remaining_space,
u64 *max_variable_size)
{
+ unsigned long flags;
+ efi_status_t status;
+
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- return efi_call_virt(query_variable_info, attr, storage_space,
- remaining_space, max_variable_size);
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(query_variable_info, attr, storage_space,
+ remaining_space, max_variable_size);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
- return efi_call_virt(get_next_high_mono_count, count);
+ unsigned long flags;
+ efi_status_t status;
+
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(get_next_high_mono_count, count);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
static void virt_efi_reset_system(int reset_type,
unsigned long data_size,
efi_char16_t *data)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&efi_runtime_lock, flags);
__efi_call_virt(reset_system, reset_type, status, data_size, data);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
}
static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
unsigned long count,
unsigned long sg_list)
{
+ unsigned long flags;
+ efi_status_t status;
+
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- return efi_call_virt(update_capsule, capsules, count, sg_list);
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(update_capsule, capsules, count, sg_list);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
u64 *max_size,
int *reset_type)
{
+ unsigned long flags;
+ efi_status_t status;
+
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- return efi_call_virt(query_capsule_caps, capsules, count, max_size,
- reset_type);
+ spin_lock_irqsave(&efi_runtime_lock, flags);
+ status = efi_call_virt(query_capsule_caps, capsules, count, max_size,
+ reset_type);
+ spin_unlock_irqrestore(&efi_runtime_lock, flags);
+ return status;
}
void efi_native_runtime_setup(void)
efi.get_variable = virt_efi_get_variable;
efi.get_next_variable = virt_efi_get_next_variable;
efi.set_variable = virt_efi_set_variable;
+ efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking;
efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
efi.reset_system = virt_efi_reset_system;
efi.query_variable_info = virt_efi_query_variable_info;
* Print a warning when duplicate EFI variables are encountered and
* disable the sysfs workqueue since the firmware is buggy.
*/
-static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid,
+static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid,
unsigned long len16)
{
size_t i, len8 = len16 / sizeof(efi_char16_t);
- char *s8;
+ char *str8;
/*
* Disable the workqueue since the algorithm it uses for
*/
efivar_wq_enabled = false;
- s8 = kzalloc(len8, GFP_KERNEL);
- if (!s8)
+ str8 = kzalloc(len8, GFP_KERNEL);
+ if (!str8)
return;
for (i = 0; i < len8; i++)
- s8[i] = s16[i];
+ str8[i] = str16[i];
printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n",
- s8, vendor_guid);
- kfree(s8);
+ str8, vendor_guid);
+ kfree(str8);
}
/**
}
EXPORT_SYMBOL_GPL(efivar_entry_set);
+/*
+ * efivar_entry_set_nonblocking - call set_variable_nonblocking()
+ *
+ * This function is guaranteed to not block and is suitable for calling
+ * from crash/panic handlers.
+ *
+ * Crucially, this function will not block if it cannot acquire
+ * __efivars->lock. Instead, it returns -EBUSY.
+ */
+static int
+efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor,
+ u32 attributes, unsigned long size, void *data)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ unsigned long flags;
+ efi_status_t status;
+
+ if (!spin_trylock_irqsave(&__efivars->lock, flags))
+ return -EBUSY;
+
+ status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
+ if (status != EFI_SUCCESS) {
+ spin_unlock_irqrestore(&__efivars->lock, flags);
+ return -ENOSPC;
+ }
+
+ status = ops->set_variable_nonblocking(name, &vendor, attributes,
+ size, data);
+
+ spin_unlock_irqrestore(&__efivars->lock, flags);
+ return efi_status_to_err(status);
+}
+
/**
* efivar_entry_set_safe - call set_variable() if enough space in firmware
* @name: buffer containing the variable name
if (!ops->query_variable_store)
return -ENOSYS;
+ /*
+ * If the EFI variable backend provides a non-blocking
+ * ->set_variable() operation and we're in a context where we
+ * cannot block, then we need to use it to avoid live-locks,
+ * since the implication is that the regular ->set_variable()
+ * will block.
+ *
+ * If no ->set_variable_nonblocking() is provided then
+ * ->set_variable() is assumed to be non-blocking.
+ */
+ if (!block && ops->set_variable_nonblocking)
+ return efivar_entry_set_nonblocking(name, vendor, attributes,
+ size, data);
+
if (!block) {
if (!spin_trylock_irqsave(&__efivars->lock, flags))
return -EBUSY;
config RTC_DRV_EFI
tristate "EFI RTC"
- depends on EFI
+ depends on EFI && !X86
help
If you say yes here you will get support for the EFI
Real Time Clock.
MODULE_AUTHOR("dann frazier <dannf@hp.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("EFI RTC driver");
+MODULE_ALIAS("platform:rtc-efi");
#define EFI_MEMORY_WC ((u64)0x0000000000000002ULL) /* write-coalescing */
#define EFI_MEMORY_WT ((u64)0x0000000000000004ULL) /* write-through */
#define EFI_MEMORY_WB ((u64)0x0000000000000008ULL) /* write-back */
+#define EFI_MEMORY_UCE ((u64)0x0000000000000010ULL) /* uncached, exported */
#define EFI_MEMORY_WP ((u64)0x0000000000001000ULL) /* write-protect */
#define EFI_MEMORY_RP ((u64)0x0000000000002000ULL) /* read-protect */
#define EFI_MEMORY_XP ((u64)0x0000000000004000ULL) /* execute-protect */
typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor,
u32 attr, unsigned long data_size,
void *data);
+typedef efi_status_t
+efi_set_variable_nonblocking_t(efi_char16_t *name, efi_guid_t *vendor,
+ u32 attr, unsigned long data_size, void *data);
+
typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
typedef void efi_reset_system_t (int reset_type, efi_status_t status,
unsigned long data_size, efi_char16_t *data);
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
+ efi_set_variable_nonblocking_t *set_variable_nonblocking;
efi_query_variable_info_t *query_variable_info;
efi_update_capsule_t *update_capsule;
efi_query_capsule_caps_t *query_capsule_caps;
(md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
(md) = (void *)(md) + (m)->desc_size)
+/*
+ * Format an EFI memory descriptor's type and attributes to a user-provided
+ * character buffer, as per snprintf(), and return the buffer.
+ */
+char * __init efi_md_typeattr_format(char *buf, size_t size,
+ const efi_memory_desc_t *md);
+
/**
* efi_range_is_wc - check the WC bit on an address range
* @start: starting kvirt address
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
+ efi_set_variable_nonblocking_t *set_variable_nonblocking;
efi_query_variable_store_t *query_variable_store;
};
unsigned long *load_addr,
unsigned long *load_size);
+efi_status_t efi_parse_options(char *cmdline);
+
+bool efi_runtime_disabled(void);
#endif /* _LINUX_EFI_H */
extern int get_option(char **str, int *pint);
extern char *get_options(const char *str, int nints, int *ints);
extern unsigned long long memparse(const char *ptr, char **retptr);
+extern bool parse_option_str(const char *str, const char *option);
extern int core_kernel_text(unsigned long addr);
extern int core_kernel_data(unsigned long addr);
return ret;
}
EXPORT_SYMBOL(memparse);
+
+/**
+ * parse_option_str - Parse a string and check an option is set or not
+ * @str: String to be parsed
+ * @option: option name
+ *
+ * This function parses a string containing a comma-separated list of
+ * strings like a=b,c.
+ *
+ * Return true if there's such option in the string, or return false.
+ */
+bool parse_option_str(const char *str, const char *option)
+{
+ while (*str) {
+ if (!strncmp(str, option, strlen(option))) {
+ str += strlen(option);
+ if (!*str || *str == ',')
+ return true;
+ }
+
+ while (*str && *str != ',')
+ str++;
+
+ if (*str == ',')
+ str++;
+ }
+
+ return false;
+}
projects / cascardo / linux.git / commitdiff