For supporting efi runtime, several efi physical addresses
fw_vendor, runtime, config tables, smbios and the whole runtime
mapping info need to be used in kexec kernel. Thus introduce
setup_data struct for passing these data.
collect the varialbes from /sys/firmware/efi/systab and
/sys/firmware/efi/runtime-map
Tested on qemu+ovmf, dell laptop, lenovo laptop and HP workstation.
v1->v2:
HPA: use uint*_t instead of __uint*_t
Simon: indention fix; fix a memory leak
move offset change update to previous patch in setup header
only passing setup_data when the bzImage support efi boot
Vivek: export a value in bzImage probe so it can be used
to check if we should pass acpi_rsdp.
coding style
v2->v3:
code cleanup
bail out if efi mm desc_version != 1
bhe: define macro for SETUP_EFI
break loop if find matched string in systab.
v3->v4:
update memmap in efi_info to the saved runtime map
So kernel side can iterate them as normal boot.
v4->v5:
simplify function get_efi_value(), add error handling
realloc error handling
move map[0] out of efi_setup_data since memmap addr is set in efi_info
Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
---
kexec/arch/i386/x86-linux-setup.c | 218 +++++++++++++++++++++++++++++++++++++-
1 file changed, 215 insertions(+), 3 deletions(-)
diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c
index 38bd9dd..5884f4d 100644
--- a/kexec/arch/i386/x86-linux-setup.c
+++ b/kexec/arch/i386/x86-linux-setup.c
@@ -36,6 +36,8 @@
#include "x86-linux-setup.h"
#include "../../kexec/kexec-syscall.h"
+#define SETUP_EFI 4
+
void init_linux_parameters(struct x86_linux_param_header *real_mode)
{
/* Fill in the values that are usually provided by the kernel. */
@@ -480,11 +482,221 @@ void setup_subarch(struct x86_linux_param_header *real_mode)
get_bootparam(&real_mode->hardware_subarch, offset, sizeof(uint32_t));
}
-static void setup_efi_info(struct x86_linux_param_header *real_mode)
+struct efi_mem_descriptor {
+ uint32_t type;
+ uint32_t pad;
+ uint64_t phys_addr;
+ uint64_t virt_addr;
+ uint64_t num_pages;
+ uint64_t attribute;
+};
+
+struct efi_setup_data {
+ uint64_t fw_vendor;
+ uint64_t runtime;
+ uint64_t tables;
+ uint64_t smbios;
+ uint64_t reserved[8];
+};
+
+struct setup_data {
+ uint64_t next;
+ uint32_t type;
+ uint32_t len;
+ uint8_t data[0];
+} __attribute__((packed));
+
+static int get_efi_value(const char *filename,
+ const char *pattern, uint64_t *val)
+{
+ FILE *fp;
+ char line[1024], *s, *end;
+
+ fp = fopen(filename, "r");
+ if (!fp)
+ return 1;
+
+ while (fgets(line, sizeof(line), fp) != 0) {
+ s = strstr(line, pattern);
+ if (!s)
+ continue;
+ *val = strtoull(s + strlen(pattern), &end, 16);
+ if (*val == ULLONG_MAX) {
+ fclose(fp);
+ return 2;
+ }
+ break;
+ }
+
+ fclose(fp);
+ return 0;
+}
+
+static int get_efi_values(struct efi_setup_data *esd)
+{
+ int ret = 0;
+
+ ret = get_efi_value("/sys/firmware/efi/systab", "SMBIOS=0x",
+ &esd->smbios);
+ ret |= get_efi_value("/sys/firmware/efi/fw_vendor", "0x",
+ &esd->fw_vendor);
+ ret |= get_efi_value("/sys/firmware/efi/runtime", "0x",
+ &esd->runtime);
+ ret |= get_efi_value("/sys/firmware/efi/config_table", "0x",
+ &esd->tables);
+ return ret;
+}
+
+static int get_efi_runtime_map(struct efi_mem_descriptor **map)
+{
+ DIR *dirp;
+ struct dirent *entry;
+ char filename[1024];
+ struct efi_mem_descriptor md, *p = NULL;
+ int nr_maps = 0;
+
+ dirp = opendir("/sys/firmware/efi/runtime-map");
+ if (!dirp)
+ return 0;
+ while ((entry = readdir(dirp)) != NULL) {
+ sprintf(filename,
+ "/sys/firmware/efi/runtime-map/%s",
+ (char *)entry->d_name);
+ if (*entry->d_name == '.')
+ continue;
+ file_scanf(filename, "type", "0x%x", (unsigned int *)&md.type);
+ file_scanf(filename, "phys_addr", "0x%llx",
+ (unsigned long long *)&md.phys_addr);
+ file_scanf(filename, "virt_addr", "0x%llx",
+ (unsigned long long *)&md.virt_addr);
+ file_scanf(filename, "num_pages", "0x%llx",
+ (unsigned long long *)&md.num_pages);
+ file_scanf(filename, "attribute", "0x%llx",
+ (unsigned long long *)&md.attribute);
+ p = realloc(p, (nr_maps + 1) * sizeof(md));
+ if (!p)
+ goto err_out;
+
+ *(p + nr_maps) = md;
+ *map = p;
+ nr_maps++;
+ }
+
+ closedir(dirp);
+ return nr_maps;
+err_out:
+ if (map)
+ free(map);
+ closedir(dirp);
+ return 0;
+}
+
+struct efi_info {
+ uint32_t efi_loader_signature;
+ uint32_t efi_systab;
+ uint32_t efi_memdesc_size;
+ uint32_t efi_memdesc_version;
+ uint32_t efi_memmap;
+ uint32_t efi_memmap_size;
+ uint32_t efi_systab_hi;
+ uint32_t efi_memmap_hi;
+};
+
+/*
+ * setup_efi_data will collect below data and pass them to 2nd kernel.
+ * 1) SMBIOS, fw_vendor, runtime, config_table, they are passed via x86
+ * setup_data.
+ * 2) runtime memory regions, set the memmap related fields in efi_info.
+ */
+static int setup_efi_data(struct kexec_info *info,
+ struct x86_linux_param_header *real_mode)
+{
+ int64_t setup_data_paddr, memmap_paddr;
+ struct setup_data *sd;
+ struct efi_setup_data *esd;
+ struct efi_mem_descriptor *maps;
+ int nr_maps, size, sdsize, ret = 0;
+ struct efi_info *ei = (struct efi_info *)real_mode->efi_info;
+
+ ret = access("/sys/firmware/efi/systab", F_OK);
+ if (ret < 0)
+ goto out;
+
+ esd = malloc(sizeof(struct efi_setup_data));
+ if (!esd) {
+ ret = 1;
+ goto out;
+ }
+ memset(esd, 0, sizeof(struct efi_setup_data));
+ ret = get_efi_values(esd);
+ if (ret)
+ goto free_esd;
+ nr_maps = get_efi_runtime_map(&maps);
+ if (!nr_maps) {
+ ret = 2;
+ goto free_esd;
+ }
+ sd = malloc(sizeof(struct setup_data) + sizeof(*esd));
+ if (!sd) {
+ ret = 3;
+ goto free_maps;
+ }
+
+ memset(sd, 0, sizeof(struct setup_data) + sizeof(*esd));
+ sd->next = 0;
+ sd->type = SETUP_EFI;
+ sd->len = sizeof(*esd);
+ memcpy(sd->data, esd, sizeof(*esd));
+ free(esd);
+ sdsize = sd->len + sizeof(struct setup_data);
+ setup_data_paddr = add_buffer(info, sd, sdsize, sdsize, getpagesize(),
+ 0x100000, ULONG_MAX, INT_MAX);
+ real_mode->setup_data = setup_data_paddr;
+
+ size = nr_maps * sizeof(struct efi_mem_descriptor);
+ memmap_paddr = add_buffer(info, maps, size, size, getpagesize(),
+ 0x100000, ULONG_MAX, INT_MAX);
+ ei->efi_memmap = memmap_paddr;
+ ei->efi_memmap_size = size;
+ ei->efi_memdesc_size = sizeof(struct efi_mem_descriptor);
+
+ return 0;
+free_maps:
+ free(maps);
+free_esd:
+ free(esd);
+out:
+ return ret;
+}
+
+static int
+get_efi_mem_desc_version(struct x86_linux_param_header *real_mode)
+{
+ struct efi_info *ei = (struct efi_info *)real_mode->efi_info;
+
+ return ei->efi_memdesc_version;
+}
+
+static void setup_efi_info(struct kexec_info *info,
+ struct x86_linux_param_header *real_mode)
{
+ int ret, desc_version;
off_t offset = offsetof(typeof(*real_mode), efi_info);
- get_bootparam(&real_mode->efi_info, offset, 32);
+ ret = get_bootparam(&real_mode->efi_info, offset, 32);
+ if (ret)
+ return;
+ desc_version = get_efi_mem_desc_version(real_mode);
+ if (desc_version != 1) {
+ fprintf(stderr,
+ "efi memory descriptor version %d is not supported!\n",
+ desc_version);
+ memset(&real_mode->efi_info, 0, 32);
+ return;
+ }
+ ret = setup_efi_data(info, real_mode);
+ if (ret)
+ memset(&real_mode->efi_info, 0, 32);
}
void setup_linux_system_parameters(struct kexec_info *info,
@@ -497,7 +709,7 @@ void setup_linux_system_parameters(struct kexec_info *info,
/* get subarch from running kernel */
setup_subarch(real_mode);
if (bzImage_support_efi_boot)
- setup_efi_info(real_mode);
+ setup_efi_info(info, real_mode);
/* Default screen size */
real_mode->orig_x = 0;
--
1.8.3.1
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