diff mbox series

[2/3] efi/arm: libstub: add a root memreserve config table

Message ID 20180921163246.16632-3-ard.biesheuvel@linaro.org
State Superseded
Headers show
Series efi: add support for persistent memory reservations | expand

Commit Message

Ard Biesheuvel Sept. 21, 2018, 4:32 p.m. UTC
Installing UEFI configuration tables can only be done before calling
ExitBootServices(), so if we want to use the new MEMRESRVE config table
from the kernel proper, we need to install a dummy entry from the stub.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 drivers/firmware/efi/libstub/arm-stub.c | 27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)

-- 
2.17.1
diff mbox series

Patch

diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index 6920033de6d4..30ac0c975f8a 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -69,6 +69,31 @@  static struct screen_info *setup_graphics(efi_system_table_t *sys_table_arg)
 	return si;
 }
 
+void install_memreserve_table(efi_system_table_t *sys_table_arg)
+{
+	struct linux_efi_memreserve *rsv;
+	efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID;
+	efi_status_t status;
+
+	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
+				(void **)&rsv);
+	if (status != EFI_SUCCESS) {
+		pr_efi_err(sys_table_arg, "Failed to allocate memreserve entry!\n");
+		return;
+	}
+
+	rsv->next = 0;
+	rsv->base = 0;
+	rsv->size = 0;
+
+	status = efi_call_early(install_configuration_table,
+				&memreserve_table_guid,
+				rsv);
+	if (status != EFI_SUCCESS)
+		pr_efi_err(sys_table_arg, "Failed to install memreserve config table!\n");
+}
+
+
 /*
  * This function handles the architcture specific differences between arm and
  * arm64 regarding where the kernel image must be loaded and any memory that
@@ -235,6 +260,8 @@  unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
 		}
 	}
 
+	install_memreserve_table(sys_table);
+
 	new_fdt_addr = fdt_addr;
 	status = allocate_new_fdt_and_exit_boot(sys_table, handle,
 				&new_fdt_addr, efi_get_max_fdt_addr(dram_base),