* virtual mode.
*/
efi.get_time = phys_efi_get_time;
- early_iounmap(runtime, sizeof(efi_runtime_services_t));
+ early_iounmap(runtime, sizeof(efi_runtime_services_64_t));
+
+ return 0;
+ }
+
+ static int __init efi_runtime_init(void)
+ {
+ int rv;
+
+ /*
+ * Check out the runtime services table. We need to map
+ * the runtime services table so that we can grab the physical
+ * address of several of the EFI runtime functions, needed to
+ * set the firmware into virtual mode.
+ */
+ if (efi_enabled(EFI_64BIT))
+ rv = efi_runtime_init64();
+ else
+ rv = efi_runtime_init32();
+
+ if (rv)
+ return rv;
+ set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+
return 0;
}
}
return new_memmap;
-out:
- kfree(new_memmap);
- return NULL;
+}
+
+static void __init kexec_enter_virtual_mode(void)
+{
+#ifdef CONFIG_KEXEC
+ efi_memory_desc_t *md;
+ void *p;
+
+ efi.systab = NULL;
+
+ /*
+ * We don't do virtual mode, since we don't do runtime services, on
+ * non-native EFI
+ */
+ if (!efi_is_native()) {
+ efi_unmap_memmap();
+ return;
+ }
+
+ /*
+ * Map efi regions which were passed via setup_data. The virt_addr is a
+ * fixed addr which was used in first kernel of a kexec boot.
+ */
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ efi_map_region_fixed(md); /* FIXME: add error handling */
+ get_systab_virt_addr(md);
+ }
+
+ save_runtime_map();
+
+ BUG_ON(!efi.systab);
+
+ efi_sync_low_kernel_mappings();
+
+ /*
+ * Now that EFI is in virtual mode, update the function
+ * pointers in the runtime service table to the new virtual addresses.
+ *
+ * Call EFI services through wrapper functions.
+ */
+ efi.runtime_version = efi_systab.hdr.revision;
- efi.get_time = virt_efi_get_time;
- efi.set_time = virt_efi_set_time;
- efi.get_wakeup_time = virt_efi_get_wakeup_time;
- efi.set_wakeup_time = virt_efi_set_wakeup_time;
- efi.get_variable = virt_efi_get_variable;
- efi.get_next_variable = virt_efi_get_next_variable;
- efi.set_variable = virt_efi_set_variable;
- efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
- efi.reset_system = virt_efi_reset_system;
++
++ native_runtime_setup();
++
+ efi.set_virtual_address_map = NULL;
- efi.query_variable_info = virt_efi_query_variable_info;
- efi.update_capsule = virt_efi_update_capsule;
- efi.query_capsule_caps = virt_efi_query_capsule_caps;
+
+ if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
+ 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);
+#endif
}
/*
efi.systab = NULL;
- /*
- * We don't do virtual mode, since we don't do runtime services, on
- * non-native EFI
- */
- if (!efi_is_native()) {
- efi_unmap_memmap();
- return;
- }
-
- if (efi_setup) {
- efi_map_regions_fixed();
- } else {
- efi_merge_regions();
- new_memmap = efi_map_regions(&count);
- if (!new_memmap) {
- pr_err("Error reallocating memory, EFI runtime non-functional!\n");
- return;
- }
+ efi_merge_regions();
+ new_memmap = efi_map_regions(&count, &pg_shift);
+ if (!new_memmap) {
+ pr_err("Error reallocating memory, EFI runtime non-functional!\n");
+ return;
}
- err = save_runtime_map();
- if (err)
- pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
+ save_runtime_map();
BUG_ON(!efi.systab);
- efi_setup_page_tables();
- efi_sync_low_kernel_mappings();
+ if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
+ return;
- if (!efi_setup) {
- if (efi_is_native()) {
- status = phys_efi_set_virtual_address_map(
- memmap.desc_size * count,
- memmap.desc_size,
- memmap.desc_version,
- (efi_memory_desc_t *)__pa(new_memmap));
- } else {
- status = efi_thunk_set_virtual_address_map(
- efi_phys.set_virtual_address_map,
- memmap.desc_size * count,
- memmap.desc_size,
- memmap.desc_version,
- (efi_memory_desc_t *)__pa(new_memmap));
- }
+ efi_sync_low_kernel_mappings();
+ efi_dump_pagetable();
+
- status = phys_efi_set_virtual_address_map(
- memmap.desc_size * count,
- memmap.desc_size,
- memmap.desc_version,
- (efi_memory_desc_t *)__pa(new_memmap));
++ if (efi_is_native()) {
++ status = phys_efi_set_virtual_address_map(
++ memmap.desc_size * count,
++ memmap.desc_size,
++ memmap.desc_version,
++ (efi_memory_desc_t *)__pa(new_memmap));
++ } else {
++ status = efi_thunk_set_virtual_address_map(
++ efi_phys.set_virtual_address_map,
++ memmap.desc_size * count,
++ memmap.desc_size,
++ memmap.desc_version,
++ (efi_memory_desc_t *)__pa(new_memmap));
++ }
- if (status != EFI_SUCCESS) {
- pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
- status);
- panic("EFI call to SetVirtualAddressMap() failed!");
- }
+ if (status != EFI_SUCCESS) {
+ pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
+ status);
+ panic("EFI call to SetVirtualAddressMap() failed!");
}
/*
return 0;
}
early_param("efi", parse_efi_cmdline);
- if (!efi_is_native()) {
+
+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);
+}
sizeof(pgd_t) * num_pgds);
}
-void efi_setup_page_tables(void)
+int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
- unsigned npages;
+ unsigned long text;
+ struct page *page;
++ unsigned npages;
+ pgd_t *pgd;
+
+ if (efi_enabled(EFI_OLD_MEMMAP))
+ return 0;
efi_scratch.efi_pgt = (pgd_t *)(unsigned long)real_mode_header->trampoline_pgd;
+ pgd = __va(efi_scratch.efi_pgt);
- if (efi_enabled(EFI_OLD_MEMMAP))
- return;
+ /*
+ * It can happen that the physical address of new_memmap lands in memory
+ * which is not mapped in the EFI page table. Therefore we need to go
+ * and ident-map those pages containing the map before calling
+ * phys_efi_set_virtual_address_map().
+ */
+ if (kernel_map_pages_in_pgd(pgd, pa_memmap, pa_memmap, num_pages, _PAGE_NX)) {
+ pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
+ return 1;
+ }
efi_scratch.use_pgd = true;
- return;
+ /*
+ * When making calls to the firmware everything needs to be 1:1
+ * mapped and addressable with 32-bit pointers. Map the kernel
+ * text and allocate a new stack because we can't rely on the
+ * stack pointer being < 4GB.
+ */
+ if (!IS_ENABLED(CONFIG_EFI_MIXED))
- if (kernel_map_pages_in_pgd(__va(efi_scratch.efi_pgt),
- text >> PAGE_SHIFT, text, npages, 0)) {
++ return 0;
+
+ page = alloc_page(GFP_KERNEL|__GFP_DMA32);
+ if (!page)
+ panic("Unable to allocate EFI runtime stack < 4GB\n");
+
+ efi_scratch.phys_stack = virt_to_phys(page_address(page));
+ efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
+
+ npages = (_end - _text) >> PAGE_SHIFT;
+ text = __pa(_text);
+
++ if (kernel_map_pages_in_pgd(pgd, text >> PAGE_SHIFT, text, npages, 0)) {
+ pr_err("Failed to map kernel text 1:1\n");
++ return 1;
+ }
+
+ return 0;
+}
+
+void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+{
+ pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
+
+ kernel_unmap_pages_in_pgd(pgd, pa_memmap, num_pages);
}
static void __init __map_region(efi_memory_desc_t *md, u64 va)
runtime_code_page_mkexec();
}
+void __init efi_dump_pagetable(void)
+{
+#ifdef CONFIG_EFI_PGT_DUMP
+ pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
+
+ ptdump_walk_pgd_level(NULL, pgd);
+#endif
+}
++
+ #ifdef CONFIG_EFI_MIXED
+ extern efi_status_t efi64_thunk(u32, ...);
+
+ #define runtime_service32(func) \
+ ({ \
+ u32 table = (u32)(unsigned long)efi.systab; \
+ u32 *rt, *___f; \
+ \
+ rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \
+ ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
+ *___f; \
+ })
+
+ /*
+ * Switch to the EFI page tables early so that we can access the 1:1
+ * runtime services mappings which are not mapped in any other page
+ * tables. This function must be called before runtime_service32().
+ *
+ * Also, disable interrupts because the IDT points to 64-bit handlers,
+ * which aren't going to function correctly when we switch to 32-bit.
+ */
+ #define efi_thunk(f, ...) \
+ ({ \
+ efi_status_t __s; \
+ unsigned long flags; \
+ u32 func; \
+ \
+ efi_sync_low_kernel_mappings(); \
+ local_irq_save(flags); \
+ \
+ efi_scratch.prev_cr3 = read_cr3(); \
+ write_cr3((unsigned long)efi_scratch.efi_pgt); \
+ __flush_tlb_all(); \
+ \
+ func = runtime_service32(f); \
+ __s = efi64_thunk(func, __VA_ARGS__); \
+ \
+ write_cr3(efi_scratch.prev_cr3); \
+ __flush_tlb_all(); \
+ local_irq_restore(flags); \
+ \
+ __s; \
+ })
+
+ efi_status_t efi_thunk_set_virtual_address_map(
+ void *phys_set_virtual_address_map,
+ unsigned long memory_map_size,
+ unsigned long descriptor_size,
+ u32 descriptor_version,
+ efi_memory_desc_t *virtual_map)
+ {
+ efi_status_t status;
+ unsigned long flags;
+ u32 func;
+
+ efi_sync_low_kernel_mappings();
+ local_irq_save(flags);
+
+ efi_scratch.prev_cr3 = read_cr3();
+ write_cr3((unsigned long)efi_scratch.efi_pgt);
+ __flush_tlb_all();
+
+ func = (u32)(unsigned long)phys_set_virtual_address_map;
+ status = efi64_thunk(func, memory_map_size, descriptor_size,
+ descriptor_version, virtual_map);
+
+ write_cr3(efi_scratch.prev_cr3);
+ __flush_tlb_all();
+ local_irq_restore(flags);
+
+ return status;
+ }
+
+ static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+ {
+ efi_status_t status;
+ u32 phys_tm, phys_tc;
+
+ spin_lock(&rtc_lock);
+
+ phys_tm = virt_to_phys(tm);
+ phys_tc = virt_to_phys(tc);
+
+ status = efi_thunk(get_time, phys_tm, phys_tc);
+
+ spin_unlock(&rtc_lock);
+
+ return status;
+ }
+
+ static efi_status_t efi_thunk_set_time(efi_time_t *tm)
+ {
+ efi_status_t status;
+ u32 phys_tm;
+
+ spin_lock(&rtc_lock);
+
+ phys_tm = virt_to_phys(tm);
+
+ status = efi_thunk(set_time, phys_tm);
+
+ spin_unlock(&rtc_lock);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
+ efi_time_t *tm)
+ {
+ efi_status_t status;
+ u32 phys_enabled, phys_pending, phys_tm;
+
+ spin_lock(&rtc_lock);
+
+ phys_enabled = virt_to_phys(enabled);
+ phys_pending = virt_to_phys(pending);
+ phys_tm = virt_to_phys(tm);
+
+ status = efi_thunk(get_wakeup_time, phys_enabled,
+ phys_pending, phys_tm);
+
+ spin_unlock(&rtc_lock);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+ {
+ efi_status_t status;
+ u32 phys_tm;
+
+ spin_lock(&rtc_lock);
+
+ phys_tm = virt_to_phys(tm);
+
+ status = efi_thunk(set_wakeup_time, enabled, phys_tm);
+
+ spin_unlock(&rtc_lock);
+
+ return status;
+ }
+
+
+ static efi_status_t
+ efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+ u32 *attr, unsigned long *data_size, void *data)
+ {
+ efi_status_t status;
+ u32 phys_name, phys_vendor, phys_attr;
+ u32 phys_data_size, phys_data;
+
+ phys_data_size = virt_to_phys(data_size);
+ phys_vendor = virt_to_phys(vendor);
+ phys_name = virt_to_phys(name);
+ phys_attr = virt_to_phys(attr);
+ phys_data = virt_to_phys(data);
+
+ status = efi_thunk(get_variable, phys_name, phys_vendor,
+ phys_attr, phys_data_size, phys_data);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+ u32 attr, unsigned long data_size, void *data)
+ {
+ u32 phys_name, phys_vendor, phys_data;
+ efi_status_t status;
+
+ phys_name = virt_to_phys(name);
+ phys_vendor = virt_to_phys(vendor);
+ phys_data = virt_to_phys(data);
+
+ /* If data_size is > sizeof(u32) we've got problems */
+ status = efi_thunk(set_variable, phys_name, phys_vendor,
+ attr, data_size, phys_data);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+ {
+ efi_status_t status;
+ u32 phys_name_size, phys_name, phys_vendor;
+
+ phys_name_size = virt_to_phys(name_size);
+ phys_vendor = virt_to_phys(vendor);
+ phys_name = virt_to_phys(name);
+
+ status = efi_thunk(get_next_variable, phys_name_size,
+ phys_name, phys_vendor);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_get_next_high_mono_count(u32 *count)
+ {
+ efi_status_t status;
+ u32 phys_count;
+
+ phys_count = virt_to_phys(count);
+ status = efi_thunk(get_next_high_mono_count, phys_count);
+
+ return status;
+ }
+
+ static void
+ efi_thunk_reset_system(int reset_type, efi_status_t status,
+ unsigned long data_size, efi_char16_t *data)
+ {
+ u32 phys_data;
+
+ phys_data = virt_to_phys(data);
+
+ efi_thunk(reset_system, reset_type, status, data_size, phys_data);
+ }
+
+ static efi_status_t
+ efi_thunk_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count, unsigned long sg_list)
+ {
+ /*
+ * To properly support this function we would need to repackage
+ * 'capsules' because the firmware doesn't understand 64-bit
+ * pointers.
+ */
+ return EFI_UNSUPPORTED;
+ }
+
+ static efi_status_t
+ efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+ {
+ efi_status_t status;
+ u32 phys_storage, phys_remaining, phys_max;
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ phys_storage = virt_to_phys(storage_space);
+ phys_remaining = virt_to_phys(remaining_space);
+ phys_max = virt_to_phys(max_variable_size);
+
+ status = efi_thunk(query_variable_info, phys_storage,
+ phys_remaining, phys_max);
+
+ return status;
+ }
+
+ static efi_status_t
+ efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count, u64 *max_size,
+ int *reset_type)
+ {
+ /*
+ * To properly support this function we would need to repackage
+ * 'capsules' because the firmware doesn't understand 64-bit
+ * pointers.
+ */
+ return EFI_UNSUPPORTED;
+ }
+
+ void efi_thunk_runtime_setup(void)
+ {
+ efi.get_time = efi_thunk_get_time;
+ efi.set_time = efi_thunk_set_time;
+ efi.get_wakeup_time = efi_thunk_get_wakeup_time;
+ efi.set_wakeup_time = efi_thunk_set_wakeup_time;
+ efi.get_variable = efi_thunk_get_variable;
+ efi.get_next_variable = efi_thunk_get_next_variable;
+ efi.set_variable = efi_thunk_set_variable;
+ efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
+ efi.reset_system = efi_thunk_reset_system;
+ efi.query_variable_info = efi_thunk_query_variable_info;
+ efi.update_capsule = efi_thunk_update_capsule;
+ efi.query_capsule_caps = efi_thunk_query_capsule_caps;
+ }
+ #endif /* CONFIG_EFI_MIXED */
projects / karo-tx-linux.git / commitdiff