Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI changes from Ingo Molnar:
"Main changes in this cycle are:
- arm64 efi stub fixes, preservation of FP/SIMD registers across
firmware calls, and conversion of the EFI stub code into a static
library - Ard Biesheuvel
- Xen EFI support - Daniel Kiper
- Support for autoloading the efivars driver - Lee, Chun-Yi
- Use the PE/COFF headers in the x86 EFI boot stub to request that
the stub be loaded with CONFIG_PHYSICAL_ALIGN alignment - Michael
Brown
- Consolidate all the x86 EFI quirks into one file - Saurabh Tangri
- Additional error logging in x86 EFI boot stub - Ulf Winkelvos
- Support loading initrd above 4G in EFI boot stub - Yinghai Lu
- EFI reboot patches for ACPI hardware reduced platforms"
* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits)
efi/arm64: Handle missing virtual mapping for UEFI System Table
arch/x86/xen: Silence compiler warnings
xen: Silence compiler warnings
x86/efi: Request desired alignment via the PE/COFF headers
x86/efi: Add better error logging to EFI boot stub
efi: Autoload efivars
efi: Update stale locking comment for struct efivars
arch/x86: Remove efi_set_rtc_mmss()
arch/x86: Replace plain strings with constants
xen: Put EFI machinery in place
xen: Define EFI related stuff
arch/x86: Remove redundant set_bit(EFI_MEMMAP) call
arch/x86: Remove redundant set_bit(EFI_SYSTEM_TABLES) call
efi: Introduce EFI_PARAVIRT flag
arch/x86: Do not access EFI memory map if it is not available
efi: Use early_mem*() instead of early_io*()
arch/ia64: Define early_memunmap()
x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag
efi/reboot: Allow powering off machines using EFI
efi/reboot: Add generic wrapper around EfiResetSystem()
...
This commit is contained in:
Linus Torvalds
279
drivers/firmware/efi/libstub/fdt.c
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279
drivers/firmware/efi/libstub/fdt.c
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@@ -0,0 +1,279 @@
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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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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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efi_memory_desc_t *memory_map,
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unsigned long map_size, unsigned long desc_size,
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u32 desc_ver)
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{
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int node, prev;
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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 any memory nodes present. We must delete nodes which
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* early_init_dt_scan_memory may try to use.
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*/
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prev = 0;
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for (;;) {
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const char *type;
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int len;
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node = fdt_next_node(fdt, prev, NULL);
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if (node < 0)
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break;
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type = fdt_getprop(fdt, node, "device_type", &len);
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if (type && strncmp(type, "memory", len) == 0) {
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fdt_del_node(fdt, node);
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continue;
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}
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prev = node;
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}
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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 = cpu_to_fdt64((u64)(unsigned long)memory_map);
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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 = cpu_to_fdt32(map_size);
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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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fdt_val32 = cpu_to_fdt32(desc_size);
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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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fdt_val32 = cpu_to_fdt32(desc_ver);
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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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/*
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* Add kernel version banner so stub/kernel match can be
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* verified.
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*/
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status = fdt_setprop_string(fdt, node, "linux,uefi-stub-kern-ver",
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linux_banner);
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if (status)
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goto fdt_set_fail;
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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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#ifndef EFI_FDT_ALIGN
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#define EFI_FDT_ALIGN EFI_PAGE_SIZE
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#endif
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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;
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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;
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unsigned long new_fdt_size;
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efi_status_t status;
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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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/*
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* Now that we have done our final memory allocation (and free)
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* we can get the memory map key needed for
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* exit_boot_services().
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*/
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status = efi_get_memory_map(sys_table, &memory_map, &map_size,
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&desc_size, &desc_ver, &mmap_key);
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if (status != EFI_SUCCESS)
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goto fail_free_new_fdt;
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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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memory_map, map_size, desc_size, desc_ver);
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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. Also free memory map, as we will need
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* to get new one that reflects the free/alloc we do
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* on the device tree buffer.
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*/
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efi_free(sys_table, new_fdt_size, *new_fdt_addr);
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sys_table->boottime->free_pool(memory_map);
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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 constuct new device tree.\n");
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goto fail_free_mmap;
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}
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}
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/* Now we are ready to exit_boot_services.*/
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status = sys_table->boottime->exit_boot_services(handle, mmap_key);
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if (status == EFI_SUCCESS)
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return status;
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pr_efi_err(sys_table, "Exit boot services failed.\n");
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fail_free_mmap:
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sys_table->boottime->free_pool(memory_map);
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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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return EFI_LOAD_ERROR;
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}
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void *get_fdt(efi_system_table_t *sys_table)
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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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void *fdt;
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int i;
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tables = (efi_config_table_t *) sys_table->tables;
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fdt = NULL;
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for (i = 0; i < sys_table->nr_tables; i++)
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if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
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fdt = (void *) tables[i].table;
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break;
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}
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return fdt;
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}
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Reference in New Issue
Block a user