Merge tag 'efi-zboot-direct-for-v6.2' into efi/next

1 files changed, 20 insertions, 69 deletions

diff --git a/drivers/firmware/efi/libstub/loongarch-stub.c b/drivers/firmware/efi/libstub/loongarch-stub.c
index 32329f2a92f9..eee7ed43cdfb 100644
--- a/drivers/firmware/efi/libstub/loongarch-stub.c
+++ b/drivers/firmware/efi/libstub/loongarch-stub.c
@@ -9,18 +9,10 @@
 #include <asm/addrspace.h>
 #include "efistub.h"
 
-typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
-					  unsigned long systab);
-
 extern int kernel_asize;
 extern int kernel_fsize;
 extern int kernel_offset;
-extern kernel_entry_t kernel_entry;
-
-efi_status_t check_platform_features(void)
-{
-	return EFI_SUCCESS;
-}
+extern int kernel_entry;
 
 efi_status_t handle_kernel_image(unsigned long *image_addr,
 				 unsigned long *image_size,
@@ -29,74 +21,33 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 				 efi_loaded_image_t *image,
 				 efi_handle_t image_handle)
 {
+	int nr_pages = round_up(kernel_asize, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
+	efi_physical_addr_t kernel_addr = EFI_KIMG_PREFERRED_ADDRESS;
 	efi_status_t status;
-	unsigned long kernel_addr = 0;
-
-	kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
-
-	status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
-				     PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0);
-
-	*image_addr = kernel_addr;
-	*image_size = kernel_asize;
-
-	return status;
-}
-
-struct exit_boot_struct {
-	efi_memory_desc_t	*runtime_map;
-	int			runtime_entry_count;
-};
-
-static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
-{
-	struct exit_boot_struct *p = priv;
 
 	/*
-	 * 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 to SetVirtualAddressMap()
+	 * Allocate space for the kernel image at the preferred offset. This is
+	 * the only location in memory from where we can execute the image, so
+	 * no point in falling back to another allocation.
 	 */
-	efi_get_virtmap(map->map, map->map_size, map->desc_size,
-			p->runtime_map, &p->runtime_entry_count);
-
-	return EFI_SUCCESS;
-}
-
-efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
-			     unsigned long kernel_addr, char *cmdline_ptr)
-{
-	kernel_entry_t real_kernel_entry;
-	struct exit_boot_struct priv;
-	unsigned long desc_size;
-	efi_status_t status;
-	u32 desc_ver;
-
-	status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
-	if (status != EFI_SUCCESS) {
-		efi_err("Unable to retrieve UEFI memory map.\n");
-		return status;
-	}
-
-	efi_info("Exiting boot services\n");
-
-	efi_novamap = false;
-	status = efi_exit_boot_services(handle, &priv, exit_boot_func);
+	status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
+			     EFI_LOADER_DATA, nr_pages, &kernel_addr);
 	if (status != EFI_SUCCESS)
 		return status;
 
-	/* Install the new virtual address map */
-	efi_rt_call(set_virtual_address_map,
-		    priv.runtime_entry_count * desc_size, desc_size,
-		    desc_ver, priv.runtime_map);
+	*image_addr = EFI_KIMG_PREFERRED_ADDRESS;
+	*image_size = kernel_asize;
 
-	/* Config Direct Mapping */
-	csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
-	csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
+	memcpy((void *)EFI_KIMG_PREFERRED_ADDRESS,
+	       (void *)&kernel_offset - kernel_offset,
+	       kernel_fsize);
 
-	real_kernel_entry = (kernel_entry_t)
-		((unsigned long)&kernel_entry - kernel_addr + VMLINUX_LOAD_ADDRESS);
+	return status;
+}
+
+unsigned long kernel_entry_address(void)
+{
+	unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
 
-	real_kernel_entry(true, (unsigned long)cmdline_ptr,
-			  (unsigned long)efi_system_table);
+	return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
 }