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;
-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
#define EFI_DEBUG
-#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 };
-
struct efi_memory_map memmap;
static struct efi efi_phys __initdata;
}
early_param("add_efi_memmap", setup_add_efi_memmap);
-static bool efi_no_storage_paranoia;
-
-static int __init setup_storage_paranoia(char *arg)
-{
- efi_no_storage_paranoia = true;
- return 0;
-}
-early_param("efi_no_storage_paranoia", setup_storage_paranoia);
-
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
unsigned long flags;
#endif /* EFI_DEBUG */
}
-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_unmap_memmap(void)
{
clear_bit(EFI_MEMMAP, &efi.flags);
}
}
-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();
-}
-
static int __init efi_systab_init(void *phys)
{
if (efi_enabled(EFI_64BIT)) {
return 0;
}
-/*
- * 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.
- */
-static 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_iounmap(tablep, nr_tables * sz);
-
-out_memremap:
- early_iounmap(data, sizeof(*data));
-out:
- return ret;
-}
-
void __init efi_init(void)
{
efi_char16_t *c16;
runtime_code_page_mkexec();
/* clean DUMMY object */
- efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
- EFI_VARIABLE_NON_VOLATILE |
- EFI_VARIABLE_BOOTSERVICE_ACCESS |
- EFI_VARIABLE_RUNTIME_ACCESS,
- 0, NULL);
+ efi_delete_dummy_variable();
#endif
}
free_pages((unsigned long)new_memmap, pg_shift);
/* clean DUMMY object */
- efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
- EFI_VARIABLE_NON_VOLATILE |
- EFI_VARIABLE_BOOTSERVICE_ACCESS |
- EFI_VARIABLE_RUNTIME_ACCESS,
- 0, NULL);
+ efi_delete_dummy_variable();
}
void __init efi_enter_virtual_mode(void)
return 0;
}
-/*
- * 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.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
- EFI_VARIABLE_NON_VOLATILE |
- EFI_VARIABLE_BOOTSERVICE_ACCESS |
- EFI_VARIABLE_RUNTIME_ACCESS,
- 0, dummy);
- }
-
- 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);
-
static int __init parse_efi_cmdline(char *str)
{
if (*str == '=')
return 0;
}
early_param("efi", parse_efi_cmdline);
-
-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);
-}
--- /dev/null
+#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 <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_iounmap(tablep, nr_tables * sz);
+
+out_memremap:
+ early_iounmap(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);
+}
projects / platform / kernel / linux-rpi.git / commitdiff