153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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/*
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* Intel Simple Firmware Interface (SFI)
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*
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* Yet another way to pass information to the Linux kernel.
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*
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* See https://simplefirmware.org/ for details
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*/
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#include <common.h>
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#include <cpu.h>
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#include <dm.h>
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#include <asm/cpu.h>
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#include <asm/ioapic.h>
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#include <asm/sfi.h>
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#include <asm/tables.h>
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#include <dm/uclass-internal.h>
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struct table_info {
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u32 base;
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int ptr;
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u32 entry_start;
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u64 table[SFI_TABLE_MAX_ENTRIES];
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int count;
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};
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static void *get_entry_start(struct table_info *tab)
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{
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if (tab->count == SFI_TABLE_MAX_ENTRIES)
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return NULL;
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tab->entry_start = tab->base + tab->ptr;
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tab->table[tab->count] = tab->entry_start;
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tab->entry_start += sizeof(struct sfi_table_header);
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return (void *)(uintptr_t)tab->entry_start;
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}
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static void finish_table(struct table_info *tab, const char *sig, void *entry)
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{
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struct sfi_table_header *hdr;
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hdr = (struct sfi_table_header *)(uintptr_t)(tab->base + tab->ptr);
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strcpy(hdr->sig, sig);
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hdr->len = sizeof(*hdr) + ((ulong)entry - tab->entry_start);
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hdr->rev = 1;
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strncpy(hdr->oem_id, "U-Boot", SFI_OEM_ID_SIZE);
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strncpy(hdr->oem_table_id, "Table v1", SFI_OEM_TABLE_ID_SIZE);
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hdr->csum = 0;
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hdr->csum = table_compute_checksum(hdr, hdr->len);
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tab->ptr += hdr->len;
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tab->ptr = ALIGN(tab->ptr, 16);
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tab->count++;
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}
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static int sfi_write_system_header(struct table_info *tab)
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{
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u64 *entry = get_entry_start(tab);
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int i;
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if (!entry)
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return -ENOSPC;
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for (i = 0; i < tab->count; i++)
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*entry++ = tab->table[i];
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finish_table(tab, SFI_SIG_SYST, entry);
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return 0;
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}
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static int sfi_write_cpus(struct table_info *tab)
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{
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struct sfi_cpu_table_entry *entry = get_entry_start(tab);
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struct udevice *dev;
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int count = 0;
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if (!entry)
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return -ENOSPC;
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for (uclass_find_first_device(UCLASS_CPU, &dev);
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dev;
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uclass_find_next_device(&dev)) {
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struct cpu_platdata *plat = dev_get_parent_platdata(dev);
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if (!device_active(dev))
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continue;
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entry->apic_id = plat->cpu_id;
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entry++;
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count++;
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}
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/* Omit the table if there is only one CPU */
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if (count > 1)
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finish_table(tab, SFI_SIG_CPUS, entry);
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return 0;
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}
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static int sfi_write_apic(struct table_info *tab)
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{
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struct sfi_apic_table_entry *entry = get_entry_start(tab);
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if (!entry)
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return -ENOSPC;
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entry->phys_addr = IO_APIC_ADDR;
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entry++;
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finish_table(tab, SFI_SIG_APIC, entry);
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return 0;
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}
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static int sfi_write_xsdt(struct table_info *tab)
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{
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struct sfi_xsdt_header *entry = get_entry_start(tab);
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if (!entry)
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return -ENOSPC;
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entry->oem_revision = 1;
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entry->creator_id = 1;
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entry->creator_revision = 1;
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entry++;
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finish_table(tab, SFI_SIG_XSDT, entry);
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return 0;
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}
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ulong write_sfi_table(ulong base)
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{
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struct table_info table;
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table.base = base;
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table.ptr = 0;
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table.count = 0;
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sfi_write_cpus(&table);
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sfi_write_apic(&table);
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/*
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* The SFI specification marks the XSDT table as option, but Linux 4.0
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* crashes on start-up when it is not provided.
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*/
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sfi_write_xsdt(&table);
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/* Finally, write out the system header which points to the others */
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sfi_write_system_header(&table);
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return base + table.ptr;
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}
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