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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>
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Ard Biesheuvel
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Feb 23, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // 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> | ||
| #include <linux/init.h> | ||
| #include <linux/efi.h> | ||
| #include <linux/of.h> | ||
| #include <linux/of_fdt.h> | ||
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| #include <asm/early_ioremap.h> | ||
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| #define UEFI_PARAM(name, prop, field) \ | ||
| { \ | ||
| { name }, \ | ||
| { prop }, \ | ||
| offsetof(struct efi_fdt_params, field), \ | ||
| sizeof_field(struct efi_fdt_params, field) \ | ||
| } | ||
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| struct params { | ||
| const char name[32]; | ||
| const char propname[32]; | ||
| int offset; | ||
| int size; | ||
| }; | ||
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| static __initdata struct params fdt_params[] = { | ||
| UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), | ||
| UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), | ||
| UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), | ||
| UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size), | ||
| UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) | ||
| }; | ||
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| static __initdata struct params xen_fdt_params[] = { | ||
| UEFI_PARAM("System Table", "xen,uefi-system-table", system_table), | ||
| UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap), | ||
| UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size), | ||
| UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size), | ||
| UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver) | ||
| }; | ||
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| #define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) | ||
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| static __initdata struct { | ||
| const char *uname; | ||
| const char *subnode; | ||
| struct params *params; | ||
| } dt_params[] = { | ||
| { "hypervisor", "uefi", xen_fdt_params }, | ||
| { "chosen", NULL, fdt_params }, | ||
| }; | ||
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| struct param_info { | ||
| int found; | ||
| void *params; | ||
| const char *missing; | ||
| }; | ||
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| static int __init __find_uefi_params(unsigned long node, | ||
| struct param_info *info, | ||
| struct params *params) | ||
| { | ||
| const void *prop; | ||
| void *dest; | ||
| u64 val; | ||
| int i, len; | ||
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| for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { | ||
| prop = of_get_flat_dt_prop(node, params[i].propname, &len); | ||
| if (!prop) { | ||
| info->missing = params[i].name; | ||
| return 0; | ||
| } | ||
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| dest = info->params + params[i].offset; | ||
| info->found++; | ||
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| val = of_read_number(prop, len / sizeof(u32)); | ||
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| if (params[i].size == sizeof(u32)) | ||
| *(u32 *)dest = val; | ||
| else | ||
| *(u64 *)dest = val; | ||
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| if (efi_enabled(EFI_DBG)) | ||
| pr_info(" %s: 0x%0*llx\n", params[i].name, | ||
| params[i].size * 2, val); | ||
| } | ||
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| return 1; | ||
| } | ||
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| static int __init fdt_find_uefi_params(unsigned long node, const char *uname, | ||
| int depth, void *data) | ||
| { | ||
| struct param_info *info = data; | ||
| int i; | ||
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| for (i = 0; i < ARRAY_SIZE(dt_params); i++) { | ||
| const char *subnode = dt_params[i].subnode; | ||
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| if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { | ||
| info->missing = dt_params[i].params[0].name; | ||
| continue; | ||
| } | ||
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| if (subnode) { | ||
| int err = of_get_flat_dt_subnode_by_name(node, subnode); | ||
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| if (err < 0) | ||
| return 0; | ||
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| node = err; | ||
| } | ||
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| return __find_uefi_params(node, info, dt_params[i].params); | ||
| } | ||
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| return 0; | ||
| } | ||
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| int __init efi_get_fdt_params(struct efi_fdt_params *params) | ||
| { | ||
| struct param_info info; | ||
| int ret; | ||
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| pr_info("Getting EFI parameters from FDT:\n"); | ||
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| info.found = 0; | ||
| info.params = params; | ||
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| ret = of_scan_flat_dt(fdt_find_uefi_params, &info); | ||
| if (!info.found) | ||
| pr_info("UEFI not found.\n"); | ||
| else if (!ret) | ||
| pr_err("Can't find '%s' in device tree!\n", | ||
| info.missing); | ||
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| return ret; | ||
| } |