diff options
Diffstat (limited to 'drivers/firmware/efi/libstub/efi-stub.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/efi-stub.c | 59 |
1 files changed, 13 insertions, 46 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c index a5a405d8ab44..914a343c7785 100644 --- a/drivers/firmware/efi/libstub/efi-stub.c +++ b/drivers/firmware/efi/libstub/efi-stub.c @@ -17,7 +17,10 @@ /* * This is the base address at which to start allocating virtual memory ranges - * for UEFI Runtime Services. This is in the low TTBR0 range so that we can use + * for UEFI Runtime Services. + * + * For ARM/ARM64: + * This is in the low TTBR0 range so that we can use * any allocation we choose, and eliminate the risk of a conflict after kexec. * The value chosen is the largest non-zero power of 2 suitable for this purpose * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can @@ -25,6 +28,12 @@ * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split, * map everything below 1 GB. (512 MB is a reasonable upper bound for the * entire footprint of the UEFI runtime services memory regions) + * + * For RISC-V: + * There is no specific reason for which, this address (512MB) can't be used + * EFI runtime virtual address for RISC-V. It also helps to use EFI runtime + * services on both RV32/RV64. Keep the same runtime virtual address for RISC-V + * as well to minimize the code churn. */ #define EFI_RT_VIRTUAL_BASE SZ_512M #define EFI_RT_VIRTUAL_SIZE SZ_512M @@ -87,40 +96,6 @@ static void install_memreserve_table(void) efi_err("Failed to install memreserve config table!\n"); } -static unsigned long get_dram_base(void) -{ - efi_status_t status; - unsigned long map_size, buff_size; - unsigned long membase = EFI_ERROR; - struct efi_memory_map map; - efi_memory_desc_t *md; - struct efi_boot_memmap boot_map; - - boot_map.map = (efi_memory_desc_t **)&map.map; - boot_map.map_size = &map_size; - boot_map.desc_size = &map.desc_size; - boot_map.desc_ver = NULL; - boot_map.key_ptr = NULL; - boot_map.buff_size = &buff_size; - - status = efi_get_memory_map(&boot_map); - if (status != EFI_SUCCESS) - return membase; - - map.map_end = map.map + map_size; - - for_each_efi_memory_desc_in_map(&map, md) { - if (md->attribute & EFI_MEMORY_WB) { - if (membase > md->phys_addr) - membase = md->phys_addr; - } - } - - efi_bs_call(free_pool, map.map); - - return membase; -} - /* * 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 @@ -134,7 +109,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, efi_status_t status; unsigned long image_addr; unsigned long image_size = 0; - unsigned long dram_base; /* addr/point and size pairs for memory management*/ unsigned long initrd_addr = 0; unsigned long initrd_size = 0; @@ -174,13 +148,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, goto fail; } - dram_base = get_dram_base(); - if (dram_base == EFI_ERROR) { - efi_err("Failed to find DRAM base\n"); - status = EFI_LOAD_ERROR; - goto fail; - } - /* * Get the command line from EFI, using the LOADED_IMAGE * protocol. We are going to copy the command line into the @@ -218,7 +185,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, status = handle_kernel_image(&image_addr, &image_size, &reserve_addr, &reserve_size, - dram_base, image); + image); if (status != EFI_SUCCESS) { efi_err("Failed to relocate kernel\n"); goto fail_free_screeninfo; @@ -262,7 +229,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, efi_info("Generating empty DTB\n"); if (!efi_noinitrd) { - max_addr = efi_get_max_initrd_addr(dram_base, image_addr); + max_addr = efi_get_max_initrd_addr(image_addr); status = efi_load_initrd(image, &initrd_addr, &initrd_size, ULONG_MAX, max_addr); if (status != EFI_SUCCESS) @@ -306,7 +273,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, install_memreserve_table(); status = allocate_new_fdt_and_exit_boot(handle, &fdt_addr, - efi_get_max_fdt_addr(dram_base), + efi_get_max_fdt_addr(image_addr), initrd_addr, initrd_size, cmdline_ptr, fdt_addr, fdt_size); if (status != EFI_SUCCESS) |