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https://github.com/Fishwaldo/u-boot.git
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x86: Add support for the Simple Firmware Interface (SFI)
This provides a way of passing information to Linux without requiring the full ACPI horror. Provide a rudimentary implementation sufficient to be recognised and parsed by Linux. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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5 changed files with 311 additions and 0 deletions
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@ -393,6 +393,20 @@ config GENERATE_PIRQ_TABLE
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It specifies the interrupt router information as well how all the PCI
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devices' interrupt pins are wired to PIRQs.
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config GENERATE_SFI_TABLE
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bool "Generate a SFI (Simple Firmware Interface) table"
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help
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The Simple Firmware Interface (SFI) provides a lightweight method
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for platform firmware to pass information to the operating system
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via static tables in memory. Kernel SFI support is required to
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boot on SFI-only platforms. If you have ACPI tables then these are
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used instead.
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U-Boot writes this table in write_sfi_table() just before booting
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the OS.
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For more information, see http://simplefirmware.org
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endmenu
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config MAX_PIRQ_LINKS
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137
arch/x86/include/asm/sfi.h
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137
arch/x86/include/asm/sfi.h
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@ -0,0 +1,137 @@
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/*
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* Copyright(c) 2009 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
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*/
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#ifndef _LINUX_SFI_H
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#define _LINUX_SFI_H
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#include <errno.h>
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#include <linux/types.h>
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/* Table signatures reserved by the SFI specification */
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#define SFI_SIG_SYST "SYST"
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#define SFI_SIG_FREQ "FREQ"
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#define SFI_SIG_CPUS "CPUS"
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#define SFI_SIG_MTMR "MTMR"
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#define SFI_SIG_MRTC "MRTC"
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#define SFI_SIG_MMAP "MMAP"
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#define SFI_SIG_APIC "APIC"
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#define SFI_SIG_XSDT "XSDT"
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#define SFI_SIG_WAKE "WAKE"
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#define SFI_SIG_DEVS "DEVS"
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#define SFI_SIG_GPIO "GPIO"
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#define SFI_SIGNATURE_SIZE 4
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#define SFI_OEM_ID_SIZE 6
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#define SFI_OEM_TABLE_ID_SIZE 8
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#define SFI_NAME_LEN 16
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#define SFI_TABLE_MAX_ENTRIES 16
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#define SFI_GET_NUM_ENTRIES(ptable, entry_type) \
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((ptable->header.len - sizeof(struct sfi_table_header)) / \
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(sizeof(entry_type)))
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/*
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* Table structures must be byte-packed to match the SFI specification,
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* as they are provided by the BIOS.
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*/
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struct __packed sfi_table_header {
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char sig[SFI_SIGNATURE_SIZE];
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u32 len;
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u8 rev;
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u8 csum;
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char oem_id[SFI_OEM_ID_SIZE];
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char oem_table_id[SFI_OEM_TABLE_ID_SIZE];
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};
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struct __packed sfi_table_simple {
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struct sfi_table_header header;
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u64 pentry[1];
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};
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/* Comply with UEFI spec 2.1 */
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struct __packed sfi_mem_entry {
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u32 type;
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u64 phys_start;
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u64 virt_start;
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u64 pages;
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u64 attrib;
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};
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struct __packed sfi_cpu_table_entry {
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u32 apic_id;
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};
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struct __packed sfi_cstate_table_entry {
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u32 hint; /* MWAIT hint */
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u32 latency; /* latency in ms */
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};
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struct __packed sfi_apic_table_entry {
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u64 phys_addr; /* phy base addr for APIC reg */
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};
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struct __packed sfi_freq_table_entry {
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u32 freq_mhz; /* in MHZ */
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u32 latency; /* transition latency in ms */
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u32 ctrl_val; /* value to write to PERF_CTL */
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};
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struct __packed sfi_wake_table_entry {
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u64 phys_addr; /* pointer to where the wake vector locates */
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};
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struct __packed sfi_timer_table_entry {
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u64 phys_addr; /* phy base addr for the timer */
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u32 freq_hz; /* in HZ */
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u32 irq;
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};
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struct __packed sfi_rtc_table_entry {
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u64 phys_addr; /* phy base addr for the RTC */
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u32 irq;
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};
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struct __packed sfi_device_table_entry {
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u8 type; /* bus type, I2C, SPI or ...*/
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u8 host_num; /* attached to host 0, 1...*/
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u16 addr;
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u8 irq;
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u32 max_freq;
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char name[SFI_NAME_LEN];
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};
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enum {
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SFI_DEV_TYPE_SPI = 0,
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SFI_DEV_TYPE_I2C,
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SFI_DEV_TYPE_UART,
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SFI_DEV_TYPE_HSI,
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SFI_DEV_TYPE_IPC,
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SFI_DEV_TYPE_SD,
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};
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struct __packed sfi_gpio_table_entry {
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char controller_name[SFI_NAME_LEN];
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u16 pin_no;
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char pin_name[SFI_NAME_LEN];
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};
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struct sfi_xsdt_header {
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uint32_t oem_revision;
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uint32_t creator_id;
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uint32_t creator_revision;
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};
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typedef int (*sfi_table_handler) (struct sfi_table_header *table);
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/**
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* write_sfi_table() - Write Simple Firmware Interface tables
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*
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* @base: Address to write table to
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* @return address to use for the next table
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*/
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u32 write_sfi_table(u32 base);
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#endif /*_LINUX_SFI_H */
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@ -26,6 +26,7 @@ obj-y += pirq_routing.o
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obj-y += relocate.o
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obj-y += physmem.o
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obj-$(CONFIG_X86_RAMTEST) += ramtest.o
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obj-y += sfi.o
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obj-y += string.o
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obj-y += tables.o
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obj-$(CONFIG_SYS_X86_TSC_TIMER) += tsc_timer.o
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154
arch/x86/lib/sfi.c
Normal file
154
arch/x86/lib/sfi.c
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@ -0,0 +1,154 @@
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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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* SPDX-License-Identifier: GPL-2.0+
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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 *)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 *)(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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u32 write_sfi_table(u32 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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@ -5,6 +5,7 @@
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*/
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#include <common.h>
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#include <asm/sfi.h>
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#include <asm/tables.h>
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u8 table_compute_checksum(void *v, int len)
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@ -27,4 +28,8 @@ void write_tables(void)
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rom_table_end = write_pirq_routing_table(rom_table_end);
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rom_table_end = ALIGN(rom_table_end, 1024);
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#endif
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#ifdef CONFIG_GENERATE_SFI_TABLE
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rom_table_end = write_sfi_table(rom_table_end);
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rom_table_end = ALIGN(rom_table_end, 1024);
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#endif
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}
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