1 files changed, 45 insertions, 133 deletions

diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
index cf474f0dd261..9cb814c5ba1b 100644
--- a/drivers/firmware/efi/libstub/efi-stub.c
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/efi.h>
+#include <linux/screen_info.h>
 #include <asm/efi.h>
 
 #include "efistub.h"
@@ -35,15 +36,6 @@
  * as well to minimize the code churn.
  */
 #define EFI_RT_VIRTUAL_BASE	SZ_512M
-#define EFI_RT_VIRTUAL_SIZE	SZ_512M
-
-#ifdef CONFIG_ARM64
-# define EFI_RT_VIRTUAL_LIMIT	DEFAULT_MAP_WINDOW_64
-#elif defined(CONFIG_RISCV) || defined(CONFIG_LOONGARCH)
-# define EFI_RT_VIRTUAL_LIMIT	TASK_SIZE_MIN
-#else /* Only if TASK_SIZE is a constant */
-# define EFI_RT_VIRTUAL_LIMIT	TASK_SIZE
-#endif
 
 /*
  * Some architectures map the EFI regions into the kernel's linear map using a
@@ -56,27 +48,22 @@
 static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
 static bool flat_va_mapping = (EFI_RT_VIRTUAL_OFFSET != 0);
 
+void __weak free_screen_info(struct screen_info *si)
+{
+}
+
 static struct screen_info *setup_graphics(void)
 {
-	efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
-	efi_status_t status;
-	unsigned long size;
-	void **gop_handle = NULL;
-	struct screen_info *si = NULL;
+	struct screen_info *si, tmp = {};
 
-	size = 0;
-	status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
-			     &gop_proto, NULL, &size, gop_handle);
-	if (status == EFI_BUFFER_TOO_SMALL) {
-		si = alloc_screen_info();
-		if (!si)
-			return NULL;
-		status = efi_setup_gop(si, &gop_proto, size);
-		if (status != EFI_SUCCESS) {
-			free_screen_info(si);
-			return NULL;
-		}
-	}
+	if (efi_setup_graphics(&tmp, NULL) != EFI_SUCCESS)
+		return NULL;
+
+	si = alloc_screen_info();
+	if (!si)
+		return NULL;
+
+	*si = tmp;
 	return si;
 }
 
@@ -115,96 +102,59 @@ static u32 get_supported_rt_services(void)
 	return supported;
 }
 
-/*
- * EFI entry point for the arm/arm64 EFI stubs.  This is the entrypoint
- * that is described in the PE/COFF header.  Most of the code is the same
- * for both archictectures, with the arch-specific code provided in the
- * handle_kernel_image() function.
- */
-efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
-				   efi_system_table_t *sys_table_arg)
+efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
 {
-	efi_loaded_image_t *image;
+	char *cmdline __free(efi_pool) = NULL;
 	efi_status_t status;
-	unsigned long image_addr;
-	unsigned long image_size = 0;
-	/* addr/point and size pairs for memory management*/
-	char *cmdline_ptr = NULL;
-	int cmdline_size = 0;
-	efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
-	unsigned long reserve_addr = 0;
-	unsigned long reserve_size = 0;
-	struct screen_info *si;
-	efi_properties_table_t *prop_tbl;
-
-	efi_system_table = sys_table_arg;
-
-	/* Check if we were booted by the EFI firmware */
-	if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
-		status = EFI_INVALID_PARAMETER;
-		goto fail;
-	}
-
-	status = check_platform_features();
-	if (status != EFI_SUCCESS)
-		goto fail;
-
-	/*
-	 * Get a handle to the loaded image protocol.  This is used to get
-	 * information about the running image, such as size and the command
-	 * line.
-	 */
-	status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
-			     (void *)&image);
-	if (status != EFI_SUCCESS) {
-		efi_err("Failed to get loaded image protocol\n");
-		goto fail;
-	}
 
 	/*
 	 * Get the command line from EFI, using the LOADED_IMAGE
 	 * protocol. We are going to copy the command line into the
 	 * device tree, so this can be allocated anywhere.
 	 */
-	cmdline_ptr = efi_convert_cmdline(image, &cmdline_size);
-	if (!cmdline_ptr) {
+	cmdline = efi_convert_cmdline(image);
+	if (!cmdline) {
 		efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
-		status = EFI_OUT_OF_RESOURCES;
-		goto fail;
+		return EFI_OUT_OF_RESOURCES;
 	}
 
-	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
-	    IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
-	    cmdline_size == 0) {
-		status = efi_parse_options(CONFIG_CMDLINE);
+	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
+		status = efi_parse_options(cmdline);
 		if (status != EFI_SUCCESS) {
-			efi_err("Failed to parse options\n");
-			goto fail_free_cmdline;
+			efi_err("Failed to parse EFI load options\n");
+			return status;
 		}
 	}
 
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
-		status = efi_parse_options(cmdline_ptr);
+	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
+	    IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
+	    cmdline[0] == 0) {
+		status = efi_parse_options(CONFIG_CMDLINE);
 		if (status != EFI_SUCCESS) {
-			efi_err("Failed to parse options\n");
-			goto fail_free_cmdline;
+			efi_err("Failed to parse built-in command line\n");
+			return status;
 		}
 	}
 
-	efi_info("Booting Linux Kernel...\n");
+	*cmdline_ptr = no_free_ptr(cmdline);
+	return EFI_SUCCESS;
+}
 
-	si = setup_graphics();
+efi_status_t efi_stub_common(efi_handle_t handle,
+			     efi_loaded_image_t *image,
+			     unsigned long image_addr,
+			     char *cmdline_ptr)
+{
+	struct screen_info *si;
+	efi_status_t status;
 
-	status = handle_kernel_image(&image_addr, &image_size,
-				     &reserve_addr,
-				     &reserve_size,
-				     image, handle);
-	if (status != EFI_SUCCESS) {
-		efi_err("Failed to relocate kernel\n");
-		goto fail_free_screeninfo;
-	}
+	status = check_platform_features();
+	if (status != EFI_SUCCESS)
+		return status;
+
+	si = setup_graphics();
 
-	efi_retrieve_tpm2_eventlog();
+	efi_retrieve_eventlog();
 
 	/* Ask the firmware to clear memory on unclean shutdown */
 	efi_enable_reset_attack_mitigation();
@@ -214,53 +164,15 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 
 	efi_random_get_seed();
 
-	/*
-	 * If the NX PE data feature is enabled in the properties table, we
-	 * should take care not to create a virtual mapping that changes the
-	 * relative placement of runtime services code and data regions, as
-	 * they may belong to the same PE/COFF executable image in memory.
-	 * The easiest way to achieve that is to simply use a 1:1 mapping.
-	 */
-	prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID);
-	flat_va_mapping |= prop_tbl &&
-			   (prop_tbl->memory_protection_attribute &
-			   EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA);
-
 	/* force efi_novamap if SetVirtualAddressMap() is unsupported */
 	efi_novamap |= !(get_supported_rt_services() &
 			 EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP);
 
-	/* hibernation expects the runtime regions to stay in the same place */
-	if (!IS_ENABLED(CONFIG_HIBERNATION) && !efi_nokaslr && !flat_va_mapping) {
-		/*
-		 * Randomize the base of the UEFI runtime services region.
-		 * Preserve the 2 MB alignment of the region by taking a
-		 * shift of 21 bit positions into account when scaling
-		 * the headroom value using a 32-bit random value.
-		 */
-		static const u64 headroom = EFI_RT_VIRTUAL_LIMIT -
-					    EFI_RT_VIRTUAL_BASE -
-					    EFI_RT_VIRTUAL_SIZE;
-		u32 rnd;
-
-		status = efi_get_random_bytes(sizeof(rnd), (u8 *)&rnd);
-		if (status == EFI_SUCCESS) {
-			virtmap_base = EFI_RT_VIRTUAL_BASE +
-				       (((headroom >> 21) * rnd) >> (32 - 21));
-		}
-	}
-
 	install_memreserve_table();
 
 	status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
 
-	efi_free(image_size, image_addr);
-	efi_free(reserve_size, reserve_addr);
-fail_free_screeninfo:
 	free_screen_info(si);
-fail_free_cmdline:
-	efi_bs_call(free_pool, cmdline_ptr);
-fail:
 	return status;
 }