cmd/acpi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2019 Google LLC
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6 #include <common.h>
   7 #include <command.h>
   8 #include <mapmem.h>
   9 #include <acpi/acpi_table.h>
  10 #include <asm/acpi_table.h>
  11 #include <dm/acpi.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 /**
  16  * dump_hdr() - Dump an ACPI header
  17  *
  18  * If the header is for FACS then it shows the revision information as well
  19  *
  20  * @hdr: ACPI header to dump
  21  */
  22 static void dump_hdr(struct acpi_table_header *hdr)
  23 {
  24         bool has_hdr = memcmp(hdr->signature, "FACS", ACPI_NAME_LEN);
  25
  26         printf("%.*s %08lx %06x", ACPI_NAME_LEN, hdr->signature,
  27                (ulong)map_to_sysmem(hdr), hdr->length);
  28         if (has_hdr) {
  29                 printf(" (v%02d %.6s %.8s %u %.4s %d)\n", hdr->revision,
  30                        hdr->oem_id, hdr->oem_table_id, hdr->oem_revision,
  31                        hdr->aslc_id, hdr->aslc_revision);
  32         } else {
  33                 printf("\n");
  34         }
  35 }
  36
  37 /**
  38  * find_table() - Look up an ACPI table
  39  *
  40  * @sig: Signature of table (4 characters, upper case)
  41  * @return pointer to table header, or NULL if not found
  42  */
  43 struct acpi_table_header *find_table(const char *sig)
  44 {
  45         struct acpi_rsdp *rsdp;
  46         struct acpi_rsdt *rsdt;
  47         int len, i, count;
  48
  49         rsdp = map_sysmem(gd->arch.acpi_start, 0);
  50         if (!rsdp)
  51                 return NULL;
  52         rsdt = map_sysmem(rsdp->rsdt_address, 0);
  53         len = rsdt->header.length - sizeof(rsdt->header);
  54         count = len / sizeof(u32);
  55         for (i = 0; i < count; i++) {
  56                 struct acpi_table_header *hdr;
  57
  58                 hdr = map_sysmem(rsdt->entry[i], 0);
  59                 if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN))
  60                         return hdr;
  61                 if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {
  62                         struct acpi_fadt *fadt = (struct acpi_fadt *)hdr;
  63
  64                         if (!memcmp(sig, "DSDT", ACPI_NAME_LEN) && fadt->dsdt)
  65                                 return map_sysmem(fadt->dsdt, 0);
  66                         if (!memcmp(sig, "FACS", ACPI_NAME_LEN) &&
  67                             fadt->firmware_ctrl)
  68                                 return map_sysmem(fadt->firmware_ctrl, 0);
  69                 }
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int dump_table_name(const char *sig)
  76 {
  77         struct acpi_table_header *hdr;
  78
  79         hdr = find_table(sig);
  80         if (!hdr)
  81                 return -ENOENT;
  82         printf("%.*s @ %08lx\n", ACPI_NAME_LEN, hdr->signature,
  83                (ulong)map_to_sysmem(hdr));
  84         print_buffer(0, hdr, 1, hdr->length, 0);
  85
  86         return 0;
  87 }
  88
  89 static void list_fadt(struct acpi_fadt *fadt)
  90 {
  91         if (fadt->dsdt)
  92                 dump_hdr(map_sysmem(fadt->dsdt, 0));
  93         if (fadt->firmware_ctrl)
  94                 dump_hdr(map_sysmem(fadt->firmware_ctrl, 0));
  95 }
  96
  97 static int list_rsdt(struct acpi_rsdt *rsdt, struct acpi_xsdt *xsdt)
  98 {
  99         int len, i, count;
 100
 101         dump_hdr(&rsdt->header);
 102         if (xsdt)
 103                 dump_hdr(&xsdt->header);
 104         len = rsdt->header.length - sizeof(rsdt->header);
 105         count = len / sizeof(u32);
 106         for (i = 0; i < count; i++) {
 107                 struct acpi_table_header *hdr;
 108
 109                 if (!rsdt->entry[i])
 110                         break;
 111                 hdr = map_sysmem(rsdt->entry[i], 0);
 112                 dump_hdr(hdr);
 113                 if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN))
 114                         list_fadt((struct acpi_fadt *)hdr);
 115                 if (xsdt) {
 116                         if (xsdt->entry[i] != rsdt->entry[i]) {
 117                                 printf("   (xsdt mismatch %llx)\n",
 118                                        xsdt->entry[i]);
 119                         }
 120                 }
 121         }
 122
 123         return 0;
 124 }
 125
 126 static int list_rsdp(struct acpi_rsdp *rsdp)
 127 {
 128         struct acpi_rsdt *rsdt;
 129         struct acpi_xsdt *xsdt;
 130
 131         printf("RSDP %08lx %06x (v%02d %.6s)\n", (ulong)map_to_sysmem(rsdp),
 132                rsdp->length, rsdp->revision, rsdp->oem_id);
 133         rsdt = map_sysmem(rsdp->rsdt_address, 0);
 134         xsdt = map_sysmem(rsdp->xsdt_address, 0);
 135         list_rsdt(rsdt, xsdt);
 136
 137         return 0;
 138 }
 139
 140 static int do_acpi_list(struct cmd_tbl *cmdtp, int flag, int argc,
 141                         char *const argv[])
 142 {
 143         struct acpi_rsdp *rsdp;
 144
 145         rsdp = map_sysmem(gd->arch.acpi_start, 0);
 146         if (!rsdp) {
 147                 printf("No ACPI tables present\n");
 148                 return 0;
 149         }
 150         printf("ACPI tables start at %lx\n", gd->arch.acpi_start);
 151         list_rsdp(rsdp);
 152
 153         return 0;
 154 }
 155
 156 static int do_acpi_dump(struct cmd_tbl *cmdtp, int flag, int argc,
 157                         char *const argv[])
 158 {
 159         const char *name;
 160         char sig[ACPI_NAME_LEN];
 161         int ret;
 162
 163         if (argc < 2)
 164                 return CMD_RET_USAGE;
 165         name = argv[1];
 166         if (strlen(name) != ACPI_NAME_LEN) {
 167                 printf("Table name '%s' must be four characters\n", name);
 168                 return CMD_RET_FAILURE;
 169         }
 170         str_to_upper(name, sig, -1);
 171         ret = dump_table_name(sig);
 172         if (ret) {
 173                 printf("Table '%.*s' not found\n", ACPI_NAME_LEN, sig);
 174                 return CMD_RET_FAILURE;
 175         }
 176
 177         return 0;
 178 }
 179
 180 static char acpi_help_text[] =
 181         "list - list ACPI tables\n"
 182         "acpi dump <name> - Dump ACPI table";
 183
 184 U_BOOT_CMD_WITH_SUBCMDS(acpi, "ACPI tables", acpi_help_text,
 185         U_BOOT_SUBCMD_MKENT(list, 1, 1, do_acpi_list),
 186         U_BOOT_SUBCMD_MKENT(dump, 2, 1, do_acpi_dump));