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-rw-r--r--drivers/firmware/dmi_scan.c79
-rw-r--r--drivers/firmware/efi/efi.c60
-rw-r--r--drivers/firmware/efi/libstub/arm-stub.c70
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c25
-rw-r--r--drivers/firmware/efi/libstub/efistub.h4
-rw-r--r--drivers/firmware/efi/libstub/fdt.c62
6 files changed, 257 insertions, 43 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 35286fe52823..29f93bf718e6 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -93,6 +93,12 @@ static void dmi_table(u8 *buf, int len, int num,
const struct dmi_header *dm = (const struct dmi_header *)data;
/*
+ * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
+ */
+ if (dm->type == DMI_ENTRY_END_OF_TABLE)
+ break;
+
+ /*
* We want to know the total length (formatted area and
* strings) before decoding to make sure we won't run off the
* table in dmi_decode or dmi_string
@@ -107,7 +113,7 @@ static void dmi_table(u8 *buf, int len, int num,
}
}
-static u32 dmi_base;
+static phys_addr_t dmi_base;
static u16 dmi_len;
static u16 dmi_num;
@@ -467,7 +473,7 @@ static int __init dmi_present(const u8 *buf)
if (memcmp(buf, "_SM_", 4) == 0 &&
buf[5] < 32 && dmi_checksum(buf, buf[5])) {
- smbios_ver = (buf[6] << 8) + buf[7];
+ smbios_ver = get_unaligned_be16(buf + 6);
/* Some BIOS report weird SMBIOS version, fix that up */
switch (smbios_ver) {
@@ -493,10 +499,9 @@ static int __init dmi_present(const u8 *buf)
dmi_ver = smbios_ver;
else
dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
- dmi_num = (buf[13] << 8) | buf[12];
- dmi_len = (buf[7] << 8) | buf[6];
- dmi_base = (buf[11] << 24) | (buf[10] << 16) |
- (buf[9] << 8) | buf[8];
+ dmi_num = get_unaligned_le16(buf + 12);
+ dmi_len = get_unaligned_le16(buf + 6);
+ dmi_base = get_unaligned_le32(buf + 8);
if (dmi_walk_early(dmi_decode) == 0) {
if (smbios_ver) {
@@ -515,12 +520,72 @@ static int __init dmi_present(const u8 *buf)
return 1;
}
+/*
+ * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
+ * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
+ */
+static int __init dmi_smbios3_present(const u8 *buf)
+{
+ if (memcmp(buf, "_SM3_", 5) == 0 &&
+ buf[6] < 32 && dmi_checksum(buf, buf[6])) {
+ dmi_ver = get_unaligned_be16(buf + 7);
+ dmi_len = get_unaligned_le32(buf + 12);
+ dmi_base = get_unaligned_le64(buf + 16);
+
+ /*
+ * The 64-bit SMBIOS 3.0 entry point no longer has a field
+ * containing the number of structures present in the table.
+ * Instead, it defines the table size as a maximum size, and
+ * relies on the end-of-table structure type (#127) to be used
+ * to signal the end of the table.
+ * So let's define dmi_num as an upper bound as well: each
+ * structure has a 4 byte header, so dmi_len / 4 is an upper
+ * bound for the number of structures in the table.
+ */
+ dmi_num = dmi_len / 4;
+
+ if (dmi_walk_early(dmi_decode) == 0) {
+ pr_info("SMBIOS %d.%d present.\n",
+ dmi_ver >> 8, dmi_ver & 0xFF);
+ dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
+ pr_debug("DMI: %s\n", dmi_ids_string);
+ return 0;
+ }
+ }
+ return 1;
+}
+
void __init dmi_scan_machine(void)
{
char __iomem *p, *q;
char buf[32];
if (efi_enabled(EFI_CONFIG_TABLES)) {
+ /*
+ * According to the DMTF SMBIOS reference spec v3.0.0, it is
+ * allowed to define both the 64-bit entry point (smbios3) and
+ * the 32-bit entry point (smbios), in which case they should
+ * either both point to the same SMBIOS structure table, or the
+ * table pointed to by the 64-bit entry point should contain a
+ * superset of the table contents pointed to by the 32-bit entry
+ * point (section 5.2)
+ * This implies that the 64-bit entry point should have
+ * precedence if it is defined and supported by the OS. If we
+ * have the 64-bit entry point, but fail to decode it, fall
+ * back to the legacy one (if available)
+ */
+ if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
+ p = dmi_early_remap(efi.smbios3, 32);
+ if (p == NULL)
+ goto error;
+ memcpy_fromio(buf, p, 32);
+ dmi_early_unmap(p, 32);
+
+ if (!dmi_smbios3_present(buf)) {
+ dmi_available = 1;
+ goto out;
+ }
+ }
if (efi.smbios == EFI_INVALID_TABLE_ADDR)
goto error;
@@ -553,7 +618,7 @@ void __init dmi_scan_machine(void)
memset(buf, 0, 16);
for (q = p; q < p + 0x10000; q += 16) {
memcpy_fromio(buf + 16, q, 16);
- if (!dmi_present(buf)) {
+ if (!dmi_smbios3_present(buf) || !dmi_present(buf)) {
dmi_available = 1;
dmi_early_unmap(p, 0x10000);
goto out;
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 8590099ac148..b7ba9d8ec4b0 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -30,6 +30,7 @@ struct efi __read_mostly efi = {
.acpi = EFI_INVALID_TABLE_ADDR,
.acpi20 = EFI_INVALID_TABLE_ADDR,
.smbios = EFI_INVALID_TABLE_ADDR,
+ .smbios3 = EFI_INVALID_TABLE_ADDR,
.sal_systab = EFI_INVALID_TABLE_ADDR,
.boot_info = EFI_INVALID_TABLE_ADDR,
.hcdp = EFI_INVALID_TABLE_ADDR,
@@ -86,6 +87,8 @@ static ssize_t systab_show(struct kobject *kobj,
str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
if (efi.smbios != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
+ if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
@@ -260,6 +263,7 @@ static __initdata efi_config_table_type_t common_tables[] = {
{MPS_TABLE_GUID, "MPS", &efi.mps},
{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
+ {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
{NULL_GUID, NULL, NULL},
};
@@ -289,29 +293,15 @@ static __init int match_config_table(efi_guid_t *guid,
return 0;
}
-int __init efi_config_init(efi_config_table_type_t *arch_tables)
+int __init efi_config_parse_tables(void *config_tables, int count, int sz,
+ efi_config_table_type_t *arch_tables)
{
- void *config_tables, *tablep;
- int i, sz;
-
- if (efi_enabled(EFI_64BIT))
- sz = sizeof(efi_config_table_64_t);
- else
- sz = sizeof(efi_config_table_32_t);
-
- /*
- * Let's see what config tables the firmware passed to us.
- */
- config_tables = early_memremap(efi.systab->tables,
- efi.systab->nr_tables * sz);
- if (config_tables == NULL) {
- pr_err("Could not map Configuration table!\n");
- return -ENOMEM;
- }
+ void *tablep;
+ int i;
tablep = config_tables;
pr_info("");
- for (i = 0; i < efi.systab->nr_tables; i++) {
+ for (i = 0; i < count; i++) {
efi_guid_t guid;
unsigned long table;
@@ -324,8 +314,6 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
if (table64 >> 32) {
pr_cont("\n");
pr_err("Table located above 4GB, disabling EFI.\n");
- early_memunmap(config_tables,
- efi.systab->nr_tables * sz);
return -EINVAL;
}
#endif
@@ -340,13 +328,37 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
tablep += sz;
}
pr_cont("\n");
- early_memunmap(config_tables, efi.systab->nr_tables * sz);
-
set_bit(EFI_CONFIG_TABLES, &efi.flags);
-
return 0;
}
+int __init efi_config_init(efi_config_table_type_t *arch_tables)
+{
+ void *config_tables;
+ int sz, ret;
+
+ if (efi_enabled(EFI_64BIT))
+ sz = sizeof(efi_config_table_64_t);
+ else
+ sz = sizeof(efi_config_table_32_t);
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ config_tables = early_memremap(efi.systab->tables,
+ efi.systab->nr_tables * sz);
+ if (config_tables == NULL) {
+ pr_err("Could not map Configuration table!\n");
+ return -ENOMEM;
+ }
+
+ ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
+ arch_tables);
+
+ early_memunmap(config_tables, efi.systab->nr_tables * sz);
+ return ret;
+}
+
#ifdef CONFIG_EFI_VARS_MODULE
static int __init efi_load_efivars(void)
{
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index 75ee05964cbc..e2432b39b6df 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -247,9 +247,18 @@ unsigned long __init efi_entry(void *handle, efi_system_table_t *sys_table,
goto fail_free_cmdline;
}
}
- if (!fdt_addr)
+
+ if (fdt_addr) {
+ pr_efi(sys_table, "Using DTB from command line\n");
+ } else {
/* Look for a device tree configuration table entry. */
fdt_addr = (uintptr_t)get_fdt(sys_table);
+ if (fdt_addr)
+ pr_efi(sys_table, "Using DTB from configuration table\n");
+ }
+
+ if (!fdt_addr)
+ pr_efi(sys_table, "Generating empty DTB\n");
status = handle_cmdline_files(sys_table, image, cmdline_ptr,
"initrd=", dram_base + SZ_512M,
@@ -286,3 +295,62 @@ fail_free_image:
fail:
return EFI_ERROR;
}
+
+/*
+ * This is the base address at which to start allocating virtual memory ranges
+ * for UEFI Runtime Services. This is in the low TTBR0 range so that we can use
+ * any allocation we choose, and eliminate the risk of a conflict after kexec.
+ * The value chosen is the largest non-zero power of 2 suitable for this purpose
+ * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
+ * be mapped efficiently.
+ */
+#define EFI_RT_VIRTUAL_BASE 0x40000000
+
+/*
+ * efi_get_virtmap() - create a virtual mapping for the EFI memory map
+ *
+ * This function populates the virt_addr fields of all memory region descriptors
+ * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
+ * are also copied to @runtime_map, and their total count is returned in @count.
+ */
+void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
+ unsigned long desc_size, efi_memory_desc_t *runtime_map,
+ int *count)
+{
+ u64 efi_virt_base = EFI_RT_VIRTUAL_BASE;
+ efi_memory_desc_t *out = runtime_map;
+ int l;
+
+ for (l = 0; l < map_size; l += desc_size) {
+ efi_memory_desc_t *in = (void *)memory_map + l;
+ u64 paddr, size;
+
+ if (!(in->attribute & EFI_MEMORY_RUNTIME))
+ continue;
+
+ /*
+ * Make the mapping compatible with 64k pages: this allows
+ * a 4k page size kernel to kexec a 64k page size kernel and
+ * vice versa.
+ */
+ paddr = round_down(in->phys_addr, SZ_64K);
+ size = round_up(in->num_pages * EFI_PAGE_SIZE +
+ in->phys_addr - paddr, SZ_64K);
+
+ /*
+ * Avoid wasting memory on PTEs by choosing a virtual base that
+ * is compatible with section mappings if this region has the
+ * appropriate size and physical alignment. (Sections are 2 MB
+ * on 4k granule kernels)
+ */
+ if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
+ efi_virt_base = round_up(efi_virt_base, SZ_2M);
+
+ in->virt_addr = efi_virt_base + in->phys_addr - paddr;
+ efi_virt_base += size;
+
+ memcpy(out, in, desc_size);
+ out = (void *)out + desc_size;
+ ++*count;
+ }
+}
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 5186eb01945a..77ef72775cbf 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -32,6 +32,15 @@
static unsigned long __chunk_size = EFI_READ_CHUNK_SIZE;
+/*
+ * Allow the platform to override the allocation granularity: this allows
+ * systems that have the capability to run with a larger page size to deal
+ * with the allocations for initrd and fdt more efficiently.
+ */
+#ifndef EFI_ALLOC_ALIGN
+#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
+#endif
+
struct file_info {
efi_file_handle_t *handle;
u64 size;
@@ -150,10 +159,10 @@ efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
* a specific address. We are doing page-based allocations,
* so we must be aligned to a page.
*/
- if (align < EFI_PAGE_SIZE)
- align = EFI_PAGE_SIZE;
+ if (align < EFI_ALLOC_ALIGN)
+ align = EFI_ALLOC_ALIGN;
- nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
+ nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
again:
for (i = 0; i < map_size / desc_size; i++) {
efi_memory_desc_t *desc;
@@ -235,10 +244,10 @@ efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
* a specific address. We are doing page-based allocations,
* so we must be aligned to a page.
*/
- if (align < EFI_PAGE_SIZE)
- align = EFI_PAGE_SIZE;
+ if (align < EFI_ALLOC_ALIGN)
+ align = EFI_ALLOC_ALIGN;
- nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
+ nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
for (i = 0; i < map_size / desc_size; i++) {
efi_memory_desc_t *desc;
unsigned long m = (unsigned long)map;
@@ -292,7 +301,7 @@ void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
if (!size)
return;
- nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
+ nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
efi_call_early(free_pages, addr, nr_pages);
}
@@ -561,7 +570,7 @@ efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
* to the preferred address. If that fails, allocate as low
* as possible while respecting the required alignment.
*/
- nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
+ nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
status = efi_call_early(allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &efi_addr);
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 304ab295ca1a..2be10984a67a 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -39,4 +39,8 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
void *get_fdt(efi_system_table_t *sys_table);
+void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
+ unsigned long desc_size, efi_memory_desc_t *runtime_map,
+ int *count);
+
#endif
diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index c846a9608cbd..91da56c4fd54 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -14,6 +14,8 @@
#include <linux/libfdt.h>
#include <asm/efi.h>
+#include "efistub.h"
+
efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
unsigned long orig_fdt_size,
void *fdt, int new_fdt_size, char *cmdline_ptr,
@@ -193,9 +195,26 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
unsigned long map_size, desc_size;
u32 desc_ver;
unsigned long mmap_key;
- efi_memory_desc_t *memory_map;
+ efi_memory_desc_t *memory_map, *runtime_map;
unsigned long new_fdt_size;
efi_status_t status;
+ int runtime_entry_count = 0;
+
+ /*
+ * Get a copy of the current memory map that we will use to prepare
+ * the input for SetVirtualAddressMap(). We don't have to worry about
+ * subsequent allocations adding entries, since they could not affect
+ * the number of EFI_MEMORY_RUNTIME regions.
+ */
+ status = efi_get_memory_map(sys_table, &runtime_map, &map_size,
+ &desc_size, &desc_ver, &mmap_key);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
+ return status;
+ }
+
+ pr_efi(sys_table,
+ "Exiting boot services and installing virtual address map...\n");
/*
* Estimate size of new FDT, and allocate memory for it. We
@@ -248,12 +267,48 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
}
}
+ /*
+ * Update the memory map with virtual addresses. The function will also
+ * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
+ * entries so that we can pass it straight into SetVirtualAddressMap()
+ */
+ efi_get_virtmap(memory_map, map_size, desc_size, runtime_map,
+ &runtime_entry_count);
+
/* Now we are ready to exit_boot_services.*/
status = sys_table->boottime->exit_boot_services(handle, mmap_key);
+ if (status == EFI_SUCCESS) {
+ efi_set_virtual_address_map_t *svam;
- if (status == EFI_SUCCESS)
- return status;
+ /* Install the new virtual address map */
+ svam = sys_table->runtime->set_virtual_address_map;
+ status = svam(runtime_entry_count * desc_size, desc_size,
+ desc_ver, runtime_map);
+
+ /*
+ * We are beyond the point of no return here, so if the call to
+ * SetVirtualAddressMap() failed, we need to signal that to the
+ * incoming kernel but proceed normally otherwise.
+ */
+ if (status != EFI_SUCCESS) {
+ int l;
+
+ /*
+ * Set the virtual address field of all
+ * EFI_MEMORY_RUNTIME entries to 0. This will signal
+ * the incoming kernel that no virtual translation has
+ * been installed.
+ */
+ for (l = 0; l < map_size; l += desc_size) {
+ efi_memory_desc_t *p = (void *)memory_map + l;
+
+ if (p->attribute & EFI_MEMORY_RUNTIME)
+ p->virt_addr = 0;
+ }
+ }
+ return EFI_SUCCESS;
+ }
pr_efi_err(sys_table, "Exit boot services failed.\n");
@@ -264,6 +319,7 @@ fail_free_new_fdt:
efi_free(sys_table, new_fdt_size, *new_fdt_addr);
fail:
+ sys_table->boottime->free_pool(runtime_map);
return EFI_LOAD_ERROR;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-19 19:12:33 +0000