373 lines
10 KiB
C
373 lines
10 KiB
C
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/*
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* FDT related Helper functions used by the EFI stub on multiple
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* architectures. This should be #included by the EFI stub
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* implementation files.
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*
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* Copyright 2013 Linaro Limited; author Roy Franz
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*
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* This file is part of the Linux kernel, and is made available
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* under the terms of the GNU General Public License version 2.
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*
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*/
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#include <linux/efi.h>
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#include <linux/libfdt.h>
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#include <asm/efi.h>
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#include "efistub.h"
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static efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
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unsigned long orig_fdt_size,
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void *fdt, int new_fdt_size, char *cmdline_ptr,
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u64 initrd_addr, u64 initrd_size)
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{
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int node, num_rsv;
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int status;
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u32 fdt_val32;
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u64 fdt_val64;
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/* Do some checks on provided FDT, if it exists*/
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if (orig_fdt) {
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if (fdt_check_header(orig_fdt)) {
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pr_efi_err(sys_table, "Device Tree header not valid!\n");
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return EFI_LOAD_ERROR;
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}
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/*
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* We don't get the size of the FDT if we get if from a
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* configuration table.
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*/
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if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
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pr_efi_err(sys_table, "Truncated device tree! foo!\n");
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return EFI_LOAD_ERROR;
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}
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}
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if (orig_fdt)
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status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
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else
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status = fdt_create_empty_tree(fdt, new_fdt_size);
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if (status != 0)
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goto fdt_set_fail;
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/*
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* Delete all memory reserve map entries. When booting via UEFI,
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* kernel will use the UEFI memory map to find reserved regions.
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*/
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num_rsv = fdt_num_mem_rsv(fdt);
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while (num_rsv-- > 0)
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fdt_del_mem_rsv(fdt, num_rsv);
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node = fdt_subnode_offset(fdt, 0, "chosen");
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if (node < 0) {
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node = fdt_add_subnode(fdt, 0, "chosen");
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if (node < 0) {
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status = node; /* node is error code when negative */
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goto fdt_set_fail;
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}
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}
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if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
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status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
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strlen(cmdline_ptr) + 1);
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if (status)
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goto fdt_set_fail;
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}
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/* Set initrd address/end in device tree, if present */
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if (initrd_size != 0) {
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u64 initrd_image_end;
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u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
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status = fdt_setprop(fdt, node, "linux,initrd-start",
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&initrd_image_start, sizeof(u64));
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if (status)
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goto fdt_set_fail;
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initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
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status = fdt_setprop(fdt, node, "linux,initrd-end",
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&initrd_image_end, sizeof(u64));
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if (status)
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goto fdt_set_fail;
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}
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/* Add FDT entries for EFI runtime services in chosen node. */
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node = fdt_subnode_offset(fdt, 0, "chosen");
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fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
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status = fdt_setprop(fdt, node, "linux,uefi-system-table",
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&fdt_val64, sizeof(fdt_val64));
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if (status)
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goto fdt_set_fail;
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fdt_val64 = U64_MAX; /* placeholder */
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status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
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&fdt_val64, sizeof(fdt_val64));
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if (status)
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goto fdt_set_fail;
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fdt_val32 = U32_MAX; /* placeholder */
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status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
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&fdt_val32, sizeof(fdt_val32));
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if (status)
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goto fdt_set_fail;
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status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
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&fdt_val32, sizeof(fdt_val32));
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if (status)
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goto fdt_set_fail;
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status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
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&fdt_val32, sizeof(fdt_val32));
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if (status)
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goto fdt_set_fail;
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if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
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efi_status_t efi_status;
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efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
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(u8 *)&fdt_val64);
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if (efi_status == EFI_SUCCESS) {
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status = fdt_setprop(fdt, node, "kaslr-seed",
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&fdt_val64, sizeof(fdt_val64));
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if (status)
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goto fdt_set_fail;
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} else if (efi_status != EFI_NOT_FOUND) {
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return efi_status;
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}
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}
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return EFI_SUCCESS;
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fdt_set_fail:
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if (status == -FDT_ERR_NOSPACE)
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return EFI_BUFFER_TOO_SMALL;
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return EFI_LOAD_ERROR;
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}
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static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
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{
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int node = fdt_path_offset(fdt, "/chosen");
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u64 fdt_val64;
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u32 fdt_val32;
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int err;
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if (node < 0)
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return EFI_LOAD_ERROR;
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fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
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err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-start",
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&fdt_val64, sizeof(fdt_val64));
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if (err)
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return EFI_LOAD_ERROR;
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fdt_val32 = cpu_to_fdt32(*map->map_size);
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err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-size",
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&fdt_val32, sizeof(fdt_val32));
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if (err)
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return EFI_LOAD_ERROR;
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fdt_val32 = cpu_to_fdt32(*map->desc_size);
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err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-size",
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&fdt_val32, sizeof(fdt_val32));
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if (err)
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return EFI_LOAD_ERROR;
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fdt_val32 = cpu_to_fdt32(*map->desc_ver);
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err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-ver",
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&fdt_val32, sizeof(fdt_val32));
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if (err)
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return EFI_LOAD_ERROR;
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return EFI_SUCCESS;
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}
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#ifndef EFI_FDT_ALIGN
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#define EFI_FDT_ALIGN EFI_PAGE_SIZE
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#endif
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struct exit_boot_struct {
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efi_memory_desc_t *runtime_map;
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int *runtime_entry_count;
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void *new_fdt_addr;
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};
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static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
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struct efi_boot_memmap *map,
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void *priv)
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{
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struct exit_boot_struct *p = priv;
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/*
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* Update the memory map with virtual addresses. The function will also
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* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
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* entries so that we can pass it straight to SetVirtualAddressMap()
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*/
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efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
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p->runtime_map, p->runtime_entry_count);
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return update_fdt_memmap(p->new_fdt_addr, map);
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}
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/*
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* Allocate memory for a new FDT, then add EFI, commandline, and
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* initrd related fields to the FDT. This routine increases the
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* FDT allocation size until the allocated memory is large
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* enough. EFI allocations are in EFI_PAGE_SIZE granules,
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* which are fixed at 4K bytes, so in most cases the first
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* allocation should succeed.
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* EFI boot services are exited at the end of this function.
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* There must be no allocations between the get_memory_map()
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* call and the exit_boot_services() call, so the exiting of
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* boot services is very tightly tied to the creation of the FDT
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* with the final memory map in it.
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*/
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efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
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void *handle,
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unsigned long *new_fdt_addr,
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unsigned long max_addr,
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u64 initrd_addr, u64 initrd_size,
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char *cmdline_ptr,
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unsigned long fdt_addr,
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unsigned long fdt_size)
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{
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unsigned long map_size, desc_size, buff_size;
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u32 desc_ver;
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unsigned long mmap_key;
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efi_memory_desc_t *memory_map, *runtime_map;
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unsigned long new_fdt_size;
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efi_status_t status;
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int runtime_entry_count = 0;
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struct efi_boot_memmap map;
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struct exit_boot_struct priv;
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map.map = &runtime_map;
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map.map_size = &map_size;
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map.desc_size = &desc_size;
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map.desc_ver = &desc_ver;
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map.key_ptr = &mmap_key;
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map.buff_size = &buff_size;
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/*
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* Get a copy of the current memory map that we will use to prepare
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* the input for SetVirtualAddressMap(). We don't have to worry about
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* subsequent allocations adding entries, since they could not affect
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* the number of EFI_MEMORY_RUNTIME regions.
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*/
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status = efi_get_memory_map(sys_table, &map);
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if (status != EFI_SUCCESS) {
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pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
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return status;
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}
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pr_efi(sys_table,
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"Exiting boot services and installing virtual address map...\n");
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map.map = &memory_map;
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/*
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* Estimate size of new FDT, and allocate memory for it. We
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* will allocate a bigger buffer if this ends up being too
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* small, so a rough guess is OK here.
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*/
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new_fdt_size = fdt_size + EFI_PAGE_SIZE;
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while (1) {
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status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
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new_fdt_addr, max_addr);
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if (status != EFI_SUCCESS) {
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pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
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goto fail;
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}
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status = update_fdt(sys_table,
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(void *)fdt_addr, fdt_size,
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(void *)*new_fdt_addr, new_fdt_size,
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cmdline_ptr, initrd_addr, initrd_size);
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/* Succeeding the first time is the expected case. */
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if (status == EFI_SUCCESS)
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break;
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if (status == EFI_BUFFER_TOO_SMALL) {
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/*
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* We need to allocate more space for the new
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* device tree, so free existing buffer that is
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* too small.
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*/
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efi_free(sys_table, new_fdt_size, *new_fdt_addr);
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new_fdt_size += EFI_PAGE_SIZE;
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} else {
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pr_efi_err(sys_table, "Unable to construct new device tree.\n");
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goto fail_free_new_fdt;
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}
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}
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priv.runtime_map = runtime_map;
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priv.runtime_entry_count = &runtime_entry_count;
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priv.new_fdt_addr = (void *)*new_fdt_addr;
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status = efi_exit_boot_services(sys_table, handle, &map, &priv,
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exit_boot_func);
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if (status == EFI_SUCCESS) {
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efi_set_virtual_address_map_t *svam;
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/* Install the new virtual address map */
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svam = sys_table->runtime->set_virtual_address_map;
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status = svam(runtime_entry_count * desc_size, desc_size,
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desc_ver, runtime_map);
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/*
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* We are beyond the point of no return here, so if the call to
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* SetVirtualAddressMap() failed, we need to signal that to the
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* incoming kernel but proceed normally otherwise.
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*/
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if (status != EFI_SUCCESS) {
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int l;
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/*
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* Set the virtual address field of all
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* EFI_MEMORY_RUNTIME entries to 0. This will signal
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* the incoming kernel that no virtual translation has
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* been installed.
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*/
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for (l = 0; l < map_size; l += desc_size) {
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efi_memory_desc_t *p = (void *)memory_map + l;
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if (p->attribute & EFI_MEMORY_RUNTIME)
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p->virt_addr = 0;
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}
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}
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return EFI_SUCCESS;
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}
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pr_efi_err(sys_table, "Exit boot services failed.\n");
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fail_free_new_fdt:
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efi_free(sys_table, new_fdt_size, *new_fdt_addr);
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fail:
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sys_table->boottime->free_pool(runtime_map);
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return EFI_LOAD_ERROR;
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}
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void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
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{
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efi_guid_t fdt_guid = DEVICE_TREE_GUID;
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efi_config_table_t *tables;
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|
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void *fdt;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
tables = (efi_config_table_t *) sys_table->tables;
|
||
|
|
fdt = NULL;
|
||
|
|
|
||
|
|
for (i = 0; i < sys_table->nr_tables; i++)
|
||
|
|
if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
|
||
|
|
fdt = (void *) tables[i].table;
|
||
|
|
if (fdt_check_header(fdt) != 0) {
|
||
|
|
pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
*fdt_size = fdt_totalsize(fdt);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return fdt;
|
||
|
|
}
|