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Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull EFI changes from Ingo Molnar:
 "Main changes in this cycle are:

   - arm64 efi stub fixes, preservation of FP/SIMD registers across
     firmware calls, and conversion of the EFI stub code into a static
     library - Ard Biesheuvel

   - Xen EFI support - Daniel Kiper

   - Support for autoloading the efivars driver - Lee, Chun-Yi

   - Use the PE/COFF headers in the x86 EFI boot stub to request that
     the stub be loaded with CONFIG_PHYSICAL_ALIGN alignment - Michael
     Brown

   - Consolidate all the x86 EFI quirks into one file - Saurabh Tangri

   - Additional error logging in x86 EFI boot stub - Ulf Winkelvos

   - Support loading initrd above 4G in EFI boot stub - Yinghai Lu

   - EFI reboot patches for ACPI hardware reduced platforms"

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits)
  efi/arm64: Handle missing virtual mapping for UEFI System Table
  arch/x86/xen: Silence compiler warnings
  xen: Silence compiler warnings
  x86/efi: Request desired alignment via the PE/COFF headers
  x86/efi: Add better error logging to EFI boot stub
  efi: Autoload efivars
  efi: Update stale locking comment for struct efivars
  arch/x86: Remove efi_set_rtc_mmss()
  arch/x86: Replace plain strings with constants
  xen: Put EFI machinery in place
  xen: Define EFI related stuff
  arch/x86: Remove redundant set_bit(EFI_MEMMAP) call
  arch/x86: Remove redundant set_bit(EFI_SYSTEM_TABLES) call
  efi: Introduce EFI_PARAVIRT flag
  arch/x86: Do not access EFI memory map if it is not available
  efi: Use early_mem*() instead of early_io*()
  arch/ia64: Define early_memunmap()
  x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag
  efi/reboot: Allow powering off machines using EFI
  efi/reboot: Add generic wrapper around EfiResetSystem()
  ...
This commit is contained in:
Linus Torvalds
2014-08-04 17:13:50 -07:00
parent e9c9eecaba 99a5603e2a
commit 76f09aa464
40 changed files with 1509 additions and 623 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/Kconfig
+6
View File
@@ -347,12 +347,18 @@ config CMDLINE_FORCE
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
config EFI_STUB
bool
config EFI
bool "UEFI runtime support"
depends on OF && !CPU_BIG_ENDIAN
select LIBFDT
select UCS2_STRING
select EFI_PARAMS_FROM_FDT
select EFI_RUNTIME_WRAPPERS
select EFI_STUB
select EFI_ARMSTUB
default y
help
This option provides support for runtime services provided
arch/arm64/Makefile
+1
View File
@@ -52,6 +52,7 @@ core-$(CONFIG_XEN) += arch/arm64/xen/
core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
libs-y := arch/arm64/lib/ $(libs-y)
libs-y += $(LIBGCC)
libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/
# Default target when executing plain make
KBUILD_IMAGE := Image.gz
arch/arm64/include/asm/efi.h
+33
View File
@@ -2,6 +2,7 @@
#define _ASM_EFI_H
#include <asm/io.h>
#include <asm/neon.h>
#ifdef CONFIG_EFI
extern void efi_init(void);
@@ -11,4 +12,36 @@ extern void efi_idmap_init(void);
#define efi_idmap_init()
#endif
#define efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f = efi.systab->runtime->f; \
efi_status_t __s; \
\
kernel_neon_begin(); \
__s = __f(__VA_ARGS__); \
kernel_neon_end(); \
__s; \
})
#define __efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f = efi.systab->runtime->f; \
\
kernel_neon_begin(); \
__f(__VA_ARGS__); \
kernel_neon_end(); \
})
/* arch specific definitions used by the stub code */
/*
* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
* start of kernel and may not cross a 2MiB boundary. We set alignment to
* 2MiB so we know it won't cross a 2MiB boundary.
*/
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
#define MAX_FDT_OFFSET SZ_512M
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#endif /* _ASM_EFI_H */
arch/arm64/kernel/Makefile
+1 -2
View File
@@ -4,8 +4,7 @@
CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) \
-I$(src)/../../../scripts/dtc/libfdt
CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
CFLAGS_REMOVE_ftrace.o = -pg
CFLAGS_REMOVE_insn.o = -pg
arch/arm64/kernel/efi-stub.c
+9 -39
View File
@@ -10,46 +10,16 @@
*
*/
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>
#include <asm/sections.h>
/*
* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
* start of kernel and may not cross a 2MiB boundary. We set alignment to
* 2MiB so we know it won't cross a 2MiB boundary.
*/
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
#define MAX_FDT_OFFSET SZ_512M
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
static void efi_char16_printk(efi_system_table_t *sys_table_arg,
efi_char16_t *str);
static efi_status_t efi_open_volume(efi_system_table_t *sys_table,
void *__image, void **__fh);
static efi_status_t efi_file_close(void *handle);
static efi_status_t
efi_file_read(void *handle, unsigned long *size, void *addr);
static efi_status_t
efi_file_size(efi_system_table_t *sys_table, void *__fh,
efi_char16_t *filename_16, void **handle, u64 *file_sz);
/* Include shared EFI stub code */
#include "../../../drivers/firmware/efi/efi-stub-helper.c"
#include "../../../drivers/firmware/efi/fdt.c"
#include "../../../drivers/firmware/efi/arm-stub.c"
static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
unsigned long dram_base,
efi_loaded_image_t *image)
efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
unsigned long dram_base,
efi_loaded_image_t *image)
{
efi_status_t status;
unsigned long kernel_size, kernel_memsize = 0;
@@ -69,7 +39,7 @@ static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
if (*image_addr != (dram_base + TEXT_OFFSET)) {
pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
efi_free(sys_table, kernel_memsize, *image_addr);
return EFI_ERROR;
return EFI_LOAD_ERROR;
}
*image_size = kernel_memsize;
}
arch/arm64/kernel/efi.c
+25 -17
View File
@@ -414,13 +414,24 @@ static int __init arm64_enter_virtual_mode(void)
for_each_efi_memory_desc(&memmap, md) {
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (remap_region(md, &virt_md))
++count;
if (!remap_region(md, &virt_md))
goto err_unmap;
++count;
}
efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
if (efi.systab)
set_bit(EFI_SYSTEM_TABLES, &efi.flags);
if (!efi.systab) {
/*
* If we have no virtual mapping for the System Table at this
* point, the memory map doesn't cover the physical offset where
* it resides. This means the System Table will be inaccessible
* to Runtime Services themselves once the virtual mapping is
* installed.
*/
pr_err("Failed to remap EFI System Table -- buggy firmware?\n");
goto err_unmap;
}
set_bit(EFI_SYSTEM_TABLES, &efi.flags);
local_irq_save(flags);
cpu_switch_mm(idmap_pg_dir, &init_mm);
@@ -449,21 +460,18 @@ static int __init arm64_enter_virtual_mode(void)
/* Set up runtime services function pointers */
runtime = efi.systab->runtime;
efi.get_time = runtime->get_time;
efi.set_time = runtime->set_time;
efi.get_wakeup_time = runtime->get_wakeup_time;
efi.set_wakeup_time = runtime->set_wakeup_time;
efi.get_variable = runtime->get_variable;
efi.get_next_variable = runtime->get_next_variable;
efi.set_variable = runtime->set_variable;
efi.query_variable_info = runtime->query_variable_info;
efi.update_capsule = runtime->update_capsule;
efi.query_capsule_caps = runtime->query_capsule_caps;
efi.get_next_high_mono_count = runtime->get_next_high_mono_count;
efi.reset_system = runtime->reset_system;
efi_native_runtime_setup();
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return 0;
err_unmap:
/* unmap all mappings that succeeded: there are 'count' of those */
for (virt_md = virtmap; count--; virt_md += memmap.desc_size) {
md = virt_md;
iounmap((__force void __iomem *)md->virt_addr);
}
kfree(virtmap);
return -1;
}
early_initcall(arm64_enter_virtual_mode);
arch/ia64/include/asm/io.h
+1
View File
@@ -426,6 +426,7 @@ extern void iounmap (volatile void __iomem *addr);
extern void __iomem * early_ioremap (unsigned long phys_addr, unsigned long size);
#define early_memremap(phys_addr, size) early_ioremap(phys_addr, size)
extern void early_iounmap (volatile void __iomem *addr, unsigned long size);
#define early_memunmap(addr, size) early_iounmap(addr, size)
static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size)
{
return ioremap(phys_addr, size);
arch/ia64/kernel/process.c
+1 -1
View File
@@ -662,7 +662,7 @@ void
machine_restart (char *restart_cmd)
{
(void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
(*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
efi_reboot(REBOOT_WARM, NULL);
}
void
arch/x86/Kconfig
+1
View File
@@ -1522,6 +1522,7 @@ config EFI
bool "EFI runtime service support"
depends on ACPI
select UCS2_STRING
select EFI_RUNTIME_WRAPPERS
---help---
This enables the kernel to use EFI runtime services that are
available (such as the EFI variable services).
arch/x86/boot/compressed/Makefile
+2 -1
View File
@@ -33,7 +33,8 @@ VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
ifeq ($(CONFIG_EFI_STUB), y)
VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o
VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
$(objtree)/drivers/firmware/efi/libstub/lib.a
endif
$(obj)/vmlinux: $(VMLINUX_OBJS) FORCE
arch/x86/boot/compressed/eboot.c
+29 -19
View File
@@ -19,10 +19,7 @@
static efi_system_table_t *sys_table;
static struct efi_config *efi_early;
#define efi_call_early(f, ...) \
efi_early->call(efi_early->f, __VA_ARGS__);
struct efi_config *efi_early;
#define BOOT_SERVICES(bits) \
static void setup_boot_services##bits(struct efi_config *c) \
@@ -48,8 +45,7 @@ static void setup_boot_services##bits(struct efi_config *c) \
BOOT_SERVICES(32);
BOOT_SERVICES(64);
static void efi_printk(efi_system_table_t *, char *);
static void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
static efi_status_t
__file_size32(void *__fh, efi_char16_t *filename_16,
@@ -156,7 +152,7 @@ grow:
return status;
}
static efi_status_t
efi_status_t
efi_file_size(efi_system_table_t *sys_table, void *__fh,
efi_char16_t *filename_16, void **handle, u64 *file_sz)
{
@@ -166,7 +162,7 @@ efi_file_size(efi_system_table_t *sys_table, void *__fh,
return __file_size32(__fh, filename_16, handle, file_sz);
}
static inline efi_status_t
efi_status_t
efi_file_read(void *handle, unsigned long *size, void *addr)
{
unsigned long func;
@@ -184,7 +180,7 @@ efi_file_read(void *handle, unsigned long *size, void *addr)
}
}
static inline efi_status_t efi_file_close(void *handle)
efi_status_t efi_file_close(void *handle)
{
if (efi_early->is64) {
efi_file_handle_64_t *fh = handle;
@@ -249,7 +245,7 @@ static inline efi_status_t __open_volume64(void *__image, void **__fh)
return status;
}
static inline efi_status_t
efi_status_t
efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
{
if (efi_early->is64)
@@ -258,7 +254,7 @@ efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
return __open_volume32(__image, __fh);
}
static void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
{
unsigned long output_string;
size_t offset;
@@ -284,8 +280,6 @@ static void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
}
}
#include "../../../../drivers/firmware/efi/efi-stub-helper.c"
static void find_bits(unsigned long mask, u8 *pos, u8 *size)
{
u8 first, len;
@@ -1038,6 +1032,7 @@ struct boot_params *make_boot_params(struct efi_config *c)
int i;
unsigned long ramdisk_addr;
unsigned long ramdisk_size;
unsigned long initrd_addr_max;
efi_early = c;
sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
@@ -1100,14 +1095,21 @@ struct boot_params *make_boot_params(struct efi_config *c)
memset(sdt, 0, sizeof(*sdt));
if (hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)
initrd_addr_max = -1UL;
else
initrd_addr_max = hdr->initrd_addr_max;
status = handle_cmdline_files(sys_table, image,
(char *)(unsigned long)hdr->cmd_line_ptr,
"initrd=", hdr->initrd_addr_max,
"initrd=", initrd_addr_max,
&ramdisk_addr, &ramdisk_size);
if (status != EFI_SUCCESS)
goto fail2;
hdr->ramdisk_image = ramdisk_addr;
hdr->ramdisk_size = ramdisk_size;
hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
hdr->ramdisk_size = ramdisk_size & 0xffffffff;
boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
return boot_params;
fail2:
@@ -1374,7 +1376,10 @@ struct boot_params *efi_main(struct efi_config *c,
setup_graphics(boot_params);
setup_efi_pci(boot_params);
status = setup_efi_pci(boot_params);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "setup_efi_pci() failed!\n");
}
status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
sizeof(*gdt), (void **)&gdt);
@@ -1401,16 +1406,20 @@ struct boot_params *efi_main(struct efi_config *c,
hdr->init_size, hdr->init_size,
hdr->pref_address,
hdr->kernel_alignment);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
goto fail;
}
hdr->pref_address = hdr->code32_start;
hdr->code32_start = bzimage_addr;
}
status = exit_boot(boot_params, handle, is64);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "exit_boot() failed!\n");
goto fail;
}
memset((char *)gdt->address, 0x0, gdt->size);
desc = (struct desc_struct *)gdt->address;
@@ -1470,5 +1479,6 @@ struct boot_params *efi_main(struct efi_config *c,
return boot_params;
fail:
efi_printk(sys_table, "efi_main() failed!\n");
return NULL;
}
arch/x86/boot/compressed/eboot.h
-16
View File
@@ -103,20 +103,4 @@ struct efi_uga_draw_protocol {
void *blt;
};
struct efi_config {
u64 image_handle;
u64 table;
u64 allocate_pool;
u64 allocate_pages;
u64 get_memory_map;
u64 free_pool;
u64 free_pages;
u64 locate_handle;
u64 handle_protocol;
u64 exit_boot_services;
u64 text_output;
efi_status_t (*call)(unsigned long, ...);
bool is64;
} __packed;
#endif /* BOOT_COMPRESSED_EBOOT_H */
arch/x86/boot/header.S
+1 -1
View File
@@ -154,7 +154,7 @@ extra_header_fields:
#else
.quad 0 # ImageBase
#endif
.long 0x20 # SectionAlignment
.long CONFIG_PHYSICAL_ALIGN # SectionAlignment
.long 0x20 # FileAlignment
.word 0 # MajorOperatingSystemVersion
.word 0 # MinorOperatingSystemVersion
arch/x86/include/asm/efi.h
+33
View File
@@ -104,6 +104,8 @@ extern void __init runtime_code_page_mkexec(void);
extern void __init efi_runtime_mkexec(void);
extern void __init efi_dump_pagetable(void);
extern void __init efi_apply_memmap_quirks(void);
extern int __init efi_reuse_config(u64 tables, int nr_tables);
extern void efi_delete_dummy_variable(void);
struct efi_setup_data {
u64 fw_vendor;
@@ -156,6 +158,33 @@ static inline efi_status_t efi_thunk_set_virtual_address_map(
return EFI_SUCCESS;
}
#endif /* CONFIG_EFI_MIXED */
/* arch specific definitions used by the stub code */
struct efi_config {
u64 image_handle;
u64 table;
u64 allocate_pool;
u64 allocate_pages;
u64 get_memory_map;
u64 free_pool;
u64 free_pages;
u64 locate_handle;
u64 handle_protocol;
u64 exit_boot_services;
u64 text_output;
efi_status_t (*call)(unsigned long, ...);
bool is64;
} __packed;
extern struct efi_config *efi_early;
#define efi_call_early(f, ...) \
efi_early->call(efi_early->f, __VA_ARGS__);
extern bool efi_reboot_required(void);
#else
/*
* IF EFI is not configured, have the EFI calls return -ENOSYS.
@@ -168,6 +197,10 @@ static inline efi_status_t efi_thunk_set_virtual_address_map(
#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)
{
return false;
}
#endif /* CONFIG_EFI */
#endif /* _ASM_X86_EFI_H */
arch/x86/kernel/reboot.c
+17 -7
View File
@@ -28,6 +28,7 @@
#include <linux/mc146818rtc.h>
#include <asm/realmode.h>
#include <asm/x86_init.h>
#include <asm/efi.h>
/*
* Power off function, if any
@@ -401,12 +402,25 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
static int __init reboot_init(void)
{
int rv;
/*
* Only do the DMI check if reboot_type hasn't been overridden
* on the command line
*/
if (reboot_default)
dmi_check_system(reboot_dmi_table);
if (!reboot_default)
return 0;
/*
* The DMI quirks table takes precedence. If no quirks entry
* matches and the ACPI Hardware Reduced bit is set, force EFI
* reboot.
*/
rv = dmi_check_system(reboot_dmi_table);
if (!rv && efi_reboot_required())
reboot_type = BOOT_EFI;
return 0;
}
core_initcall(reboot_init);
@@ -528,11 +542,7 @@ static void native_machine_emergency_restart(void)
break;
case BOOT_EFI:
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi.reset_system(reboot_mode == REBOOT_WARM ?
EFI_RESET_WARM :
EFI_RESET_COLD,
EFI_SUCCESS, 0, NULL);
efi_reboot(reboot_mode, NULL);
reboot_type = BOOT_BIOS;
break;
arch/x86/kernel/setup.c
+2 -2
View File
@@ -924,10 +924,10 @@ void __init setup_arch(char **cmdline_p)
#endif
#ifdef CONFIG_EFI
if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
"EL32", 4)) {
EFI32_LOADER_SIGNATURE, 4)) {
set_bit(EFI_BOOT, &efi.flags);
} else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
"EL64", 4)) {
EFI64_LOADER_SIGNATURE, 4)) {
set_bit(EFI_BOOT, &efi.flags);
set_bit(EFI_64BIT, &efi.flags);
}
arch/x86/platform/efi/Makefile
+1 -1
View File
@@ -1,4 +1,4 @@
obj-$(CONFIG_EFI) += efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o
obj-$(CONFIG_EARLY_PRINTK_EFI) += early_printk.o
obj-$(CONFIG_EFI_MIXED) += efi_thunk_$(BITS).o
arch/x86/platform/efi/efi.c
+46 -437
View File
File diff suppressed because it is too large Load Diff
arch/x86/platform/efi/quirks.c
+290
View File
@@ -0,0 +1,290 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/types.h>
#include <linux/efi.h>
#include <linux/slab.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <asm/efi.h>
#include <asm/uv/uv.h>
#define EFI_MIN_RESERVE 5120
#define EFI_DUMMY_GUID \
EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9)
static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
static bool efi_no_storage_paranoia;
/*
* Some firmware implementations refuse to boot if there's insufficient
* space in the variable store. The implementation of garbage collection
* in some FW versions causes stale (deleted) variables to take up space
* longer than intended and space is only freed once the store becomes
* almost completely full.
*
* Enabling this option disables the space checks in
* efi_query_variable_store() and forces garbage collection.
*
* Only enable this option if deleting EFI variables does not free up
* space in your variable store, e.g. if despite deleting variables
* you're unable to create new ones.
*/
static int __init setup_storage_paranoia(char *arg)
{
efi_no_storage_paranoia = true;
return 0;
}
early_param("efi_no_storage_paranoia", setup_storage_paranoia);
/*
* Deleting the dummy variable which kicks off garbage collection
*/
void efi_delete_dummy_variable(void)
{
efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
0, NULL);
}
/*
* Some firmware implementations refuse to boot if there's insufficient space
* in the variable store. Ensure that we never use more than a safe limit.
*
* Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
* store.
*/
efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
{
efi_status_t status;
u64 storage_size, remaining_size, max_size;
if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
return 0;
status = efi.query_variable_info(attributes, &storage_size,
&remaining_size, &max_size);
if (status != EFI_SUCCESS)
return status;
/*
* We account for that by refusing the write if permitting it would
* reduce the available space to under 5KB. This figure was provided by
* Samsung, so should be safe.
*/
if ((remaining_size - size < EFI_MIN_RESERVE) &&
!efi_no_storage_paranoia) {
/*
* Triggering garbage collection may require that the firmware
* generate a real EFI_OUT_OF_RESOURCES error. We can force
* that by attempting to use more space than is available.
*/
unsigned long dummy_size = remaining_size + 1024;
void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
if (!dummy)
return EFI_OUT_OF_RESOURCES;
status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
dummy_size, dummy);
if (status == EFI_SUCCESS) {
/*
* This should have failed, so if it didn't make sure
* that we delete it...
*/
efi_delete_dummy_variable();
}
kfree(dummy);
/*
* The runtime code may now have triggered a garbage collection
* run, so check the variable info again
*/
status = efi.query_variable_info(attributes, &storage_size,
&remaining_size, &max_size);
if (status != EFI_SUCCESS)
return status;
/*
* There still isn't enough room, so return an error
*/
if (remaining_size - size < EFI_MIN_RESERVE)
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
EXPORT_SYMBOL_GPL(efi_query_variable_store);
/*
* The UEFI specification makes it clear that the operating system is free to do
* whatever it wants with boot services code after ExitBootServices() has been
* called. Ignoring this recommendation a significant bunch of EFI implementations
* continue calling into boot services code (SetVirtualAddressMap). In order to
* work around such buggy implementations we reserve boot services region during
* EFI init and make sure it stays executable. Then, after SetVirtualAddressMap(), it
* is discarded.
*/
void __init efi_reserve_boot_services(void)
{
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p;
u64 start = md->phys_addr;
u64 size = md->num_pages << EFI_PAGE_SHIFT;
if (md->type != EFI_BOOT_SERVICES_CODE &&
md->type != EFI_BOOT_SERVICES_DATA)
continue;
/* Only reserve where possible:
* - Not within any already allocated areas
* - Not over any memory area (really needed, if above?)
* - Not within any part of the kernel
* - Not the bios reserved area
*/
if ((start + size > __pa_symbol(_text)
&& start <= __pa_symbol(_end)) ||
!e820_all_mapped(start, start+size, E820_RAM) ||
memblock_is_region_reserved(start, size)) {
/* Could not reserve, skip it */
md->num_pages = 0;
memblock_dbg("Could not reserve boot range [0x%010llx-0x%010llx]\n",
start, start+size-1);
} else
memblock_reserve(start, size);
}
}
void __init efi_free_boot_services(void)
{
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p;
unsigned long long start = md->phys_addr;
unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
if (md->type != EFI_BOOT_SERVICES_CODE &&
md->type != EFI_BOOT_SERVICES_DATA)
continue;
/* Could not reserve boot area */
if (!size)
continue;
free_bootmem_late(start, size);
}
efi_unmap_memmap();
}
/*
* A number of config table entries get remapped to virtual addresses
* after entering EFI virtual mode. However, the kexec kernel requires
* their physical addresses therefore we pass them via setup_data and
* correct those entries to their respective physical addresses here.
*
* Currently only handles smbios which is necessary for some firmware
* implementation.
*/
int __init efi_reuse_config(u64 tables, int nr_tables)
{
int i, sz, ret = 0;
void *p, *tablep;
struct efi_setup_data *data;
if (!efi_setup)
return 0;
if (!efi_enabled(EFI_64BIT))
return 0;
data = early_memremap(efi_setup, sizeof(*data));
if (!data) {
ret = -ENOMEM;
goto out;
}
if (!data->smbios)
goto out_memremap;
sz = sizeof(efi_config_table_64_t);
p = tablep = early_memremap(tables, nr_tables * sz);
if (!p) {
pr_err("Could not map Configuration table!\n");
ret = -ENOMEM;
goto out_memremap;
}
for (i = 0; i < efi.systab->nr_tables; i++) {
efi_guid_t guid;
guid = ((efi_config_table_64_t *)p)->guid;
if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID))
((efi_config_table_64_t *)p)->table = data->smbios;
p += sz;
}
early_memunmap(tablep, nr_tables * sz);
out_memremap:
early_memunmap(data, sizeof(*data));
out:
return ret;
}
void __init efi_apply_memmap_quirks(void)
{
/*
* Once setup is done earlier, unmap the EFI memory map on mismatched
* firmware/kernel architectures since there is no support for runtime
* services.
*/
if (!efi_runtime_supported()) {
pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
efi_unmap_memmap();
}
/*
* UV doesn't support the new EFI pagetable mapping yet.
*/
if (is_uv_system())
set_bit(EFI_OLD_MEMMAP, &efi.flags);
}
/*
* For most modern platforms the preferred method of powering off is via
* ACPI. However, there are some that are known to require the use of
* EFI runtime services and for which ACPI does not work at all.
*
* Using EFI is a last resort, to be used only if no other option
* exists.
*/
bool efi_reboot_required(void)
{
if (!acpi_gbl_reduced_hardware)
return false;
efi_reboot_quirk_mode = EFI_RESET_WARM;
return true;
}
bool efi_poweroff_required(void)
{
return !!acpi_gbl_reduced_hardware;
}
arch/x86/xen/Makefile
+1
View File
@@ -22,3 +22,4 @@ obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += apic.o vga.o
obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
obj-$(CONFIG_XEN_EFI) += efi.o

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