140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*
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* Copyright (C) 2013 Linaro Ltd; <roy.franz@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/efi.h>
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#include <asm/efi.h>
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efi_status_t check_platform_features(efi_system_table_t *sys_table_arg)
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{
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int block;
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/* non-LPAE kernels can run anywhere */
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if (!IS_ENABLED(CONFIG_ARM_LPAE))
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return EFI_SUCCESS;
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/* LPAE kernels need compatible hardware */
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block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
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if (block < 5) {
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pr_efi_err(sys_table_arg, "This LPAE kernel is not supported by your CPU\n");
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return EFI_UNSUPPORTED;
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}
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return EFI_SUCCESS;
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}
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static efi_guid_t screen_info_guid = LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID;
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struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg)
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{
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struct screen_info *si;
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efi_status_t status;
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/*
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* Unlike on arm64, where we can directly fill out the screen_info
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* structure from the stub, we need to allocate a buffer to hold
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* its contents while we hand over to the kernel proper from the
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* decompressor.
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*/
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status = efi_call_early(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
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sizeof(*si), (void **)&si);
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if (status != EFI_SUCCESS)
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return NULL;
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status = efi_call_early(install_configuration_table,
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&screen_info_guid, si);
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if (status == EFI_SUCCESS)
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return si;
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efi_call_early(free_pool, si);
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return NULL;
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}
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void free_screen_info(efi_system_table_t *sys_table_arg, struct screen_info *si)
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{
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if (!si)
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return;
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efi_call_early(install_configuration_table, &screen_info_guid, NULL);
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efi_call_early(free_pool, si);
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}
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efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
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unsigned long *image_addr,
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unsigned long *image_size,
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unsigned long *reserve_addr,
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unsigned long *reserve_size,
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unsigned long dram_base,
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efi_loaded_image_t *image)
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{
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unsigned long nr_pages;
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efi_status_t status;
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/* Use alloc_addr to tranlsate between types */
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efi_physical_addr_t alloc_addr;
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/*
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* Verify that the DRAM base address is compatible with the ARM
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* boot protocol, which determines the base of DRAM by masking
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* off the low 27 bits of the address at which the zImage is
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* loaded. These assumptions are made by the decompressor,
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* before any memory map is available.
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*/
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dram_base = round_up(dram_base, SZ_128M);
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/*
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* Reserve memory for the uncompressed kernel image. This is
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* all that prevents any future allocations from conflicting
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* with the kernel. Since we can't tell from the compressed
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* image how much DRAM the kernel actually uses (due to BSS
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* size uncertainty) we allocate the maximum possible size.
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* Do this very early, as prints can cause memory allocations
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* that may conflict with this.
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*/
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alloc_addr = dram_base;
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*reserve_size = MAX_UNCOMP_KERNEL_SIZE;
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nr_pages = round_up(*reserve_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
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status = sys_table->boottime->allocate_pages(EFI_ALLOCATE_ADDRESS,
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EFI_LOADER_DATA,
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nr_pages, &alloc_addr);
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if (status != EFI_SUCCESS) {
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*reserve_size = 0;
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pr_efi_err(sys_table, "Unable to allocate memory for uncompressed kernel.\n");
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return status;
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}
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*reserve_addr = alloc_addr;
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/*
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* Relocate the zImage, so that it appears in the lowest 128 MB
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* memory window.
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*/
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*image_size = image->image_size;
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status = efi_relocate_kernel(sys_table, image_addr, *image_size,
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*image_size,
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dram_base + MAX_UNCOMP_KERNEL_SIZE, 0);
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if (status != EFI_SUCCESS) {
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pr_efi_err(sys_table, "Failed to relocate kernel.\n");
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efi_free(sys_table, *reserve_size, *reserve_addr);
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*reserve_size = 0;
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return status;
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}
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/*
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* Check to see if we were able to allocate memory low enough
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* in memory. The kernel determines the base of DRAM from the
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* address at which the zImage is loaded.
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*/
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if (*image_addr + *image_size > dram_base + ZIMAGE_OFFSET_LIMIT) {
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pr_efi_err(sys_table, "Failed to relocate kernel, no low memory available.\n");
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efi_free(sys_table, *reserve_size, *reserve_addr);
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*reserve_size = 0;
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efi_free(sys_table, *image_size, *image_addr);
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*image_size = 0;
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return EFI_LOAD_ERROR;
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}
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return EFI_SUCCESS;
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}
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