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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 01:57:06 +07:00
efi/arm: Move FDT param discovery code out of efi.c
On ARM systems, we discover the UEFI system table address and memory map address from the /chosen node in the device tree, or in the Xen case, from a similar node under /hypervisor. Before making some functional changes to that code, move it into its own file that only gets built if CONFIG_EFI_PARAMS_FROM_FDT=y. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel
parent
97aa276579
commit
ac5abc700a
@ -13,6 +13,7 @@ KASAN_SANITIZE_runtime-wrappers.o := n
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obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o
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obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o tpm.o
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obj-$(CONFIG_EFI) += capsule.o memmap.o
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obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o
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obj-$(CONFIG_EFI_VARS) += efivars.o
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obj-$(CONFIG_EFI_ESRT) += esrt.o
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obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
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@ -20,7 +20,6 @@
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#include <linux/device.h>
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#include <linux/efi.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/io.h>
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#include <linux/kexec.h>
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#include <linux/platform_device.h>
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@ -646,140 +645,6 @@ static int __init efi_load_efivars(void)
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device_initcall(efi_load_efivars);
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#endif
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#ifdef CONFIG_EFI_PARAMS_FROM_FDT
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#define UEFI_PARAM(name, prop, field) \
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{ \
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{ name }, \
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{ prop }, \
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offsetof(struct efi_fdt_params, field), \
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sizeof_field(struct efi_fdt_params, field) \
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}
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struct params {
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const char name[32];
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const char propname[32];
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int offset;
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int size;
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};
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static __initdata struct params fdt_params[] = {
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UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
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UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
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UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
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UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
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UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
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};
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static __initdata struct params xen_fdt_params[] = {
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UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
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UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
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UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
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UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
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UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
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};
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#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
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static __initdata struct {
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const char *uname;
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const char *subnode;
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struct params *params;
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} dt_params[] = {
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{ "hypervisor", "uefi", xen_fdt_params },
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{ "chosen", NULL, fdt_params },
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};
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struct param_info {
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int found;
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void *params;
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const char *missing;
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};
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static int __init __find_uefi_params(unsigned long node,
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struct param_info *info,
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struct params *params)
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{
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const void *prop;
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void *dest;
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u64 val;
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int i, len;
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for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
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prop = of_get_flat_dt_prop(node, params[i].propname, &len);
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if (!prop) {
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info->missing = params[i].name;
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return 0;
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}
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dest = info->params + params[i].offset;
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info->found++;
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val = of_read_number(prop, len / sizeof(u32));
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if (params[i].size == sizeof(u32))
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*(u32 *)dest = val;
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else
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*(u64 *)dest = val;
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if (efi_enabled(EFI_DBG))
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pr_info(" %s: 0x%0*llx\n", params[i].name,
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params[i].size * 2, val);
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}
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return 1;
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}
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static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
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int depth, void *data)
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{
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struct param_info *info = data;
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int i;
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for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
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const char *subnode = dt_params[i].subnode;
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if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
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info->missing = dt_params[i].params[0].name;
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continue;
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}
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if (subnode) {
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int err = of_get_flat_dt_subnode_by_name(node, subnode);
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if (err < 0)
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return 0;
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node = err;
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}
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return __find_uefi_params(node, info, dt_params[i].params);
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}
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return 0;
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}
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int __init efi_get_fdt_params(struct efi_fdt_params *params)
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{
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struct param_info info;
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int ret;
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pr_info("Getting EFI parameters from FDT:\n");
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info.found = 0;
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info.params = params;
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ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
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if (!info.found)
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pr_info("UEFI not found.\n");
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else if (!ret)
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pr_err("Can't find '%s' in device tree!\n",
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info.missing);
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return ret;
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}
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#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
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static __initdata char memory_type_name[][20] = {
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"Reserved",
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"Loader Code",
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142
drivers/firmware/efi/fdtparams.c
Normal file
142
drivers/firmware/efi/fdtparams.c
Normal file
@ -0,0 +1,142 @@
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// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "efi: " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/efi.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/early_ioremap.h>
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#define UEFI_PARAM(name, prop, field) \
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{ \
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{ name }, \
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{ prop }, \
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offsetof(struct efi_fdt_params, field), \
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sizeof_field(struct efi_fdt_params, field) \
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}
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struct params {
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const char name[32];
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const char propname[32];
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int offset;
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int size;
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};
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static __initdata struct params fdt_params[] = {
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UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
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UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
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UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
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UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
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UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
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};
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static __initdata struct params xen_fdt_params[] = {
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UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
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UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
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UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
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UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
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UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
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};
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#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
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static __initdata struct {
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const char *uname;
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const char *subnode;
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struct params *params;
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} dt_params[] = {
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{ "hypervisor", "uefi", xen_fdt_params },
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{ "chosen", NULL, fdt_params },
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};
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struct param_info {
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int found;
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void *params;
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const char *missing;
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};
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static int __init __find_uefi_params(unsigned long node,
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struct param_info *info,
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struct params *params)
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{
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const void *prop;
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void *dest;
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u64 val;
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int i, len;
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for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
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prop = of_get_flat_dt_prop(node, params[i].propname, &len);
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if (!prop) {
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info->missing = params[i].name;
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return 0;
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}
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dest = info->params + params[i].offset;
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info->found++;
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val = of_read_number(prop, len / sizeof(u32));
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if (params[i].size == sizeof(u32))
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*(u32 *)dest = val;
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else
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*(u64 *)dest = val;
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if (efi_enabled(EFI_DBG))
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pr_info(" %s: 0x%0*llx\n", params[i].name,
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params[i].size * 2, val);
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}
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return 1;
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}
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static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
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int depth, void *data)
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{
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struct param_info *info = data;
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int i;
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for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
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const char *subnode = dt_params[i].subnode;
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if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
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info->missing = dt_params[i].params[0].name;
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continue;
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}
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if (subnode) {
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int err = of_get_flat_dt_subnode_by_name(node, subnode);
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if (err < 0)
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return 0;
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node = err;
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}
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return __find_uefi_params(node, info, dt_params[i].params);
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}
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return 0;
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}
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int __init efi_get_fdt_params(struct efi_fdt_params *params)
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{
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struct param_info info;
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int ret;
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pr_info("Getting EFI parameters from FDT:\n");
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info.found = 0;
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info.params = params;
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ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
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if (!info.found)
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pr_info("UEFI not found.\n");
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else if (!ret)
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pr_err("Can't find '%s' in device tree!\n",
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info.missing);
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return ret;
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}
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