efi/libstub/efi-stub.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * EFI stub implementation that is shared by arm and arm64 architectures.
4  * This should be #included by the EFI stub implementation files.
12 #include <linux/efi.h>
13 #include <asm/efi.h>
21  * For ARM/ARM64:
24  * The value chosen is the largest non-zero power of 2 suitable for this purpose
25  * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
27  * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split,
31  * For RISC-V:
33  * EFI runtime virtual address for RISC-V. It also helps to use EFI runtime
34  * services on both RV32/RV64. Keep the same runtime virtual address for RISC-V
40  * Some architectures map the EFI regions into the kernel's linear map using a
91 	rsv->next = 0;  in install_memreserve_table()
92 	rsv->size = 0;  in install_memreserve_table()
93 	atomic_set(&rsv->count, 0);  in install_memreserve_table()
108 		supported &= rt_prop_table->runtime_services_supported;  in get_supported_rt_services()
120 	 * Get the command line from EFI, using the LOADED_IMAGE  in efi_handle_cmdline()
193  * efi_allocate_virtmap() - create a pool allocation for the virtmap
222  * efi_get_virtmap() - create a virtual mapping for the EFI memory map
242 		if (!(in->attribute & EFI_MEMORY_RUNTIME))  in efi_get_virtmap()
245 		paddr = in->phys_addr;  in efi_get_virtmap()
246 		size = in->num_pages * EFI_PAGE_SIZE;  in efi_get_virtmap()
248 		in->virt_addr = in->phys_addr + EFI_RT_VIRTUAL_OFFSET;  in efi_get_virtmap()
260 			paddr = round_down(in->phys_addr, SZ_64K);  in efi_get_virtmap()
261 			size += in->phys_addr - paddr;  in efi_get_virtmap()
269 			if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)  in efi_get_virtmap()
274 			in->virt_addr += efi_virt_base - paddr;  in efi_get_virtmap()