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