x86: Add MultiProcessor (MP) table APIs

The MP table provides a way for the operating system to support
for symmetric multiprocessing as well as symmetric I/O interrupt
handling with the local APIC and I/O APIC. We provide a bunch of
APIs for U-Boot to write the floating table, configuration table
header as well as base and extended table entries.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/mpspec.h

+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Adapted from coreboot src/arch/x86/include/arch/smp/mpspec.h
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ASM_MPSPEC_H
+#define __ASM_MPSPEC_H
+
+/*
+ * Structure definitions for SMP machines following the
+ * Intel MultiProcessor Specification 1.4
+ */
+
+#define MPSPEC_V14	4
+
+#define MPF_SIGNATURE	"_MP_"
+
+struct mp_floating_table {
+	char mpf_signature[4];	/* "_MP_" */
+	u32 mpf_physptr;	/* Configuration table address */
+	u8 mpf_length;		/* Our length (paragraphs) */
+	u8 mpf_spec;		/* Specification version */
+	u8 mpf_checksum;	/* Checksum (makes sum 0) */
+	u8 mpf_feature1;	/* Predefined or Unique configuration? */
+	u8 mpf_feature2;	/* Bit7 set for IMCR/PIC */
+	u8 mpf_feature3;	/* Unused (0) */
+	u8 mpf_feature4;	/* Unused (0) */
+	u8 mpf_feature5;	/* Unused (0) */
+};
+
+#define MPC_SIGNATURE	"PCMP"
+
+struct mp_config_table {
+	char mpc_signature[4];	/* "PCMP" */
+	u16 mpc_length;		/* Size of table */
+	u8 mpc_spec;		/* Specification version */
+	u8 mpc_checksum;	/* Checksum (makes sum 0) */
+	char mpc_oem[8];	/* OEM ID */
+	char mpc_product[12];	/* Product ID */
+	u32 mpc_oemptr;		/* OEM table address */
+	u16 mpc_oemsize;	/* OEM table size */
+	u16 mpc_entry_count;	/* Number of entries in the table */
+	u32 mpc_lapic;		/* Local APIC address */
+	u16 mpe_length;		/* Extended table size */
+	u8 mpe_checksum;	/* Extended table checksum */
+	u8 reserved;
+};
+
+/* Base MP configuration table entry types */
+
+enum mp_base_config_entry_type {
+	MP_PROCESSOR,
+	MP_BUS,
+	MP_IOAPIC,
+	MP_INTSRC,
+	MP_LINTSRC
+};
+
+#define MPC_CPU_EN	(1 << 0)
+#define MPC_CPU_BP	(1 << 1)
+
+struct mpc_config_processor {
+	u8 mpc_type;
+	u8 mpc_apicid;
+	u8 mpc_apicver;
+	u8 mpc_cpuflag;
+	u32 mpc_cpusignature;
+	u32 mpc_cpufeature;
+	u32 mpc_reserved[2];
+};
+
+#define BUSTYPE_CBUS	"CBUS  "
+#define BUSTYPE_CBUSII	"CBUSII"
+#define BUSTYPE_EISA	"EISA  "
+#define BUSTYPE_FUTURE	"FUTURE"
+#define BUSTYPE_INTERN	"INTERN"
+#define BUSTYPE_ISA	"ISA   "
+#define BUSTYPE_MBI	"MBI   "
+#define BUSTYPE_MBII	"MBII  "
+#define BUSTYPE_MCA	"MCA   "
+#define BUSTYPE_MPI	"MPI   "
+#define BUSTYPE_MPSA	"MPSA  "
+#define BUSTYPE_NUBUS	"NUBUS "
+#define BUSTYPE_PCI	"PCI   "
+#define BUSTYPE_PCMCIA	"PCMCIA"
+#define BUSTYPE_TC	"TC    "
+#define BUSTYPE_VL	"VL    "
+#define BUSTYPE_VME	"VME   "
+#define BUSTYPE_XPRESS	"XPRESS"
+
+struct mpc_config_bus {
+	u8 mpc_type;
+	u8 mpc_busid;
+	u8 mpc_bustype[6];
+};
+
+#define MPC_APIC_USABLE	(1 << 0)
+
+struct mpc_config_ioapic {
+	u8 mpc_type;
+	u8 mpc_apicid;
+	u8 mpc_apicver;
+	u8 mpc_flags;
+	u32 mpc_apicaddr;
+};
+
+enum mp_irq_source_types {
+	MP_INT,
+	MP_NMI,
+	MP_SMI,
+	MP_EXTINT
+};
+
+#define MP_IRQ_POLARITY_DEFAULT	0x0
+#define MP_IRQ_POLARITY_HIGH	0x1
+#define MP_IRQ_POLARITY_LOW	0x3
+#define MP_IRQ_POLARITY_MASK	0x3
+#define MP_IRQ_TRIGGER_DEFAULT	0x0
+#define MP_IRQ_TRIGGER_EDGE	0x4
+#define MP_IRQ_TRIGGER_LEVEL	0xc
+#define MP_IRQ_TRIGGER_MASK	0xc
+
+#define MP_APIC_ALL		0xff
+
+struct mpc_config_intsrc {
+	u8 mpc_type;
+	u8 mpc_irqtype;
+	u16 mpc_irqflag;
+	u8 mpc_srcbus;
+	u8 mpc_srcbusirq;
+	u8 mpc_dstapic;
+	u8 mpc_dstirq;
+};
+
+struct mpc_config_lintsrc {
+	u8 mpc_type;
+	u8 mpc_irqtype;
+	u16 mpc_irqflag;
+	u8 mpc_srcbusid;
+	u8 mpc_srcbusirq;
+	u8 mpc_destapic;
+	u8 mpc_destlint;
+};
+
+/* Extended MP configuration table entry types */
+
+enum mp_ext_config_entry_type {
+	MPE_SYSTEM_ADDRESS_SPACE = 128,
+	MPE_BUS_HIERARCHY,
+	MPE_COMPAT_ADDRESS_SPACE
+};
+
+struct mp_ext_config {
+	u8 mpe_type;
+	u8 mpe_length;
+};
+
+#define ADDRESS_TYPE_IO		0
+#define ADDRESS_TYPE_MEM	1
+#define ADDRESS_TYPE_PREFETCH	2
+
+struct mp_ext_system_address_space {
+	u8 mpe_type;
+	u8 mpe_length;
+	u8 mpe_busid;
+	u8 mpe_addr_type;
+	u32 mpe_addr_base_low;
+	u32 mpe_addr_base_high;
+	u32 mpe_addr_length_low;
+	u32 mpe_addr_length_high;
+};
+
+#define BUS_SUBTRACTIVE_DECODE	(1 << 0)
+
+struct mp_ext_bus_hierarchy {
+	u8 mpe_type;
+	u8 mpe_length;
+	u8 mpe_busid;
+	u8 mpe_bus_info;
+	u8 mpe_parent_busid;
+	u8 reserved[3];
+};
+
+#define ADDRESS_RANGE_ADD	0
+#define ADDRESS_RANGE_SUBTRACT	1
+
+/*
+ * X100 - X3FF
+ * X500 - X7FF
+ * X900 - XBFF
+ * XD00 - XFFF
+ */
+#define RANGE_LIST_IO_ISA	0
+/*
+ * X3B0 - X3BB
+ * X3C0 - X3DF
+ * X7B0 - X7BB
+ * X7C0 - X7DF
+ * XBB0 - XBBB
+ * XBC0 - XBDF
+ * XFB0 - XFBB
+ * XFC0 - XCDF
+ */
+#define RANGE_LIST_IO_VGA	1
+
+struct mp_ext_compat_address_space {
+	u8 mpe_type;
+	u8 mpe_length;
+	u8 mpe_busid;
+	u8 mpe_addr_modifier;
+	u32 mpe_range_list;
+};
+
+/**
+ * mp_next_mpc_entry() - Compute MP configuration table end to be used as
+ *                       next base table entry start address
+ *
+ * This computes the end address of current MP configuration table, without
+ * counting any extended configuration table entry.
+ *
+ * @mc:		configuration table header address
+ * @return:	configuration table end address
+ */
+static inline u32 mp_next_mpc_entry(struct mp_config_table *mc)
+{
+	return (u32)mc + mc->mpc_length;
+}
+
+/**
+ * mp_add_mpc_entry() - Add a base MP configuration table entry
+ *
+ * This adds the base MP configuration table entry size with
+ * added base table entry length and increases entry count by 1.
+ *
+ * @mc:		configuration table header address
+ * @length:	length of the added table entry
+ */
+static inline void mp_add_mpc_entry(struct mp_config_table *mc, uint length)
+{
+	mc->mpc_length += length;
+	mc->mpc_entry_count++;
+}
+
+/**
+ * mp_next_mpe_entry() - Compute MP configuration table end to be used as
+ *                       next extended table entry start address
+ *
+ * This computes the end address of current MP configuration table,
+ * including any extended configuration table entry.
+ *
+ * @mc:		configuration table header address
+ * @return:	configuration table end address
+ */
+static inline u32 mp_next_mpe_entry(struct mp_config_table *mc)
+{
+	return (u32)mc + mc->mpc_length + mc->mpe_length;
+}
+
+/**
+ * mp_add_mpe_entry() - Add an extended MP configuration table entry
+ *
+ * This adds the extended MP configuration table entry size with
+ * added extended table entry length.
+ *
+ * @mc:		configuration table header address
+ * @mpe:	extended table entry base address
+ */
+static inline void mp_add_mpe_entry(struct mp_config_table *mc,
+				    struct mp_ext_config *mpe)
+{
+	mc->mpe_length += mpe->mpe_length;
+}
+
+/**
+ * mp_write_floating_table() - Write the MP floating table
+ *
+ * This writes the MP floating table, and points MP configuration table
+ * to its end address so that MP configuration table follows immediately
+ * after the floating table.
+ *
+ * @mf:		MP floating table base address
+ * @return:	MP configuration table header address
+ */
+struct mp_config_table *mp_write_floating_table(struct mp_floating_table *mf);
+
+/**
+ * mp_config_table_init() - Initialize the MP configuration table header
+ *
+ * This populates the MP configuration table header with valid bits.
+ *
+ * @mc:		MP configuration table header address
+ */
+void mp_config_table_init(struct mp_config_table *mc);
+
+/**
+ * mp_write_processor() - Write a processor entry
+ *
+ * This writes a processor entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ */
+void mp_write_processor(struct mp_config_table *mc);
+
+/**
+ * mp_write_bus() - Write a bus entry
+ *
+ * This writes a bus entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ * @id:		bus id
+ * @bustype:	bus type name
+ */
+void mp_write_bus(struct mp_config_table *mc, int id, const char *bustype);
+
+/**
+ * mp_write_ioapic() - Write an I/O APIC entry
+ *
+ * This writes an I/O APIC entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ * @id:		I/O APIC id
+ * @ver:	I/O APIC version
+ * @apicaddr:	I/O APIC address
+ */
+void mp_write_ioapic(struct mp_config_table *mc, int id, int ver, u32 apicaddr);
+
+/**
+ * mp_write_intsrc() - Write an I/O interrupt assignment entry
+ *
+ * This writes an I/O interrupt assignment entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ * @irqtype:	IRQ type (INT/NMI/SMI/ExtINT)
+ * @irqflag:	IRQ flag (level/trigger)
+ * @srcbus:	source bus id where the interrupt comes from
+ * @srcbusirq:	IRQ number mapped on the source bus
+ * @dstapic:	destination I/O APIC id where the interrupt goes to
+ * @dstirq:	destination I/O APIC pin where the interrupt goes to
+ */
+void mp_write_intsrc(struct mp_config_table *mc, int irqtype, int irqflag,
+		     int srcbus, int srcbusirq, int dstapic, int dstirq);
+
+/**
+ * mp_write_pci_intsrc() - Write a PCI interrupt assignment entry
+ *
+ * This writes a PCI interrupt assignment entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ * @irqtype:	IRQ type (INT/NMI/SMI/ExtINT)
+ * @srcbus:	PCI bus number where the interrupt comes from
+ * @dev:	device number on the PCI bus
+ * @pin:	PCI interrupt pin (INT A/B/C/D)
+ * @dstapic:	destination I/O APIC id where the interrupt goes to
+ * @dstirq:	destination I/O APIC pin where the interrupt goes to
+ */
+void mp_write_pci_intsrc(struct mp_config_table *mc, int irqtype,
+			 int srcbus, int dev, int pin, int dstapic, int dstirq);
+
+/**
+ * mp_write_lintsrc() - Write a local interrupt assignment entry
+ *
+ * This writes a local interrupt assignment entry to the configuration table.
+ *
+ * @mc:		MP configuration table header address
+ * @irqtype:	IRQ type (INT/NMI/SMI/ExtINT)
+ * @irqflag:	IRQ flag (level/trigger)
+ * @srcbus:	PCI bus number where the interrupt comes from
+ * @srcbusirq:	IRQ number mapped on the source bus
+ * @dstapic:	destination local APIC id where the interrupt goes to
+ * @destlint:	destination local APIC pin where the interrupt goes to
+ */
+void mp_write_lintsrc(struct mp_config_table *mc, int irqtype, int irqflag,
+		      int srcbus, int srcbusirq, int destapic, int destlint);
+
+
+/**
+ * mp_write_address_space() - Write a system address space entry
+ *
+ * This writes a system address space entry to the configuration table.
+ *
+ * @mc:			MP configuration table header address
+ * @busid:		bus id for the bus where system address space is mapped
+ * @addr_type:		system address type
+ * @addr_base_low:	starting address low
+ * @addr_base_high:	starting address high
+ * @addr_length_low:	address length low
+ * @addr_length_high:	address length high
+ */
+void mp_write_address_space(struct mp_config_table *mc,
+			    int busid, int addr_type,
+			    u32 addr_base_low, u32 addr_base_high,
+			    u32 addr_length_low, u32 addr_length_high);
+
+/**
+ * mp_write_bus_hierarchy() - Write a bus hierarchy descriptor entry
+ *
+ * This writes a bus hierarchy descriptor entry to the configuration table.
+ *
+ * @mc:			MP configuration table header address
+ * @busid:		bus id
+ * @bus_info:		bit0 indicates if the bus is a subtractive decode bus
+ * @parent_busid:	parent bus id
+ */
+void mp_write_bus_hierarchy(struct mp_config_table *mc,
+			    int busid, int bus_info, int parent_busid);
+
+/**
+ * mp_write_compat_address_space() - Write a compat bus address space entry
+ *
+ * This writes a compatibility bus address space modifier entry to the
+ * configuration table.
+ *
+ * @mc:			MP configuration table header address
+ * @busid:		bus id
+ * @addr_modifier:	add or subtract to predefined address range list
+ * @range_list:		list of predefined address space ranges
+ */
+void mp_write_compat_address_space(struct mp_config_table *mc, int busid,
+				   int addr_modifier, u32 range_list);
+
+/**
+ * mptable_finalize() - Finalize the MP table
+ *
+ * This finalizes the MP table by calculating required checksums.
+ *
+ * @mc:		MP configuration table header address
+ * @return:	MP table end address
+ */
+u32 mptable_finalize(struct mp_config_table *mc);
+
+#endif /* __ASM_MPSPEC_H */

arch/x86/include/asm/tables.h

@@ -27,6 +27,20 @@
  */
 u8 table_compute_checksum(void *v, int len);
 
+/**
+ * table_fill_string() - Fill a string with pad in the configuration table
+ *
+ * This fills a string in the configuration table. It copies number of bytes
+ * from the source string, and if source string length is shorter than the
+ * required size to copy, pad the table string with the given pad character.
+ *
+ * @dest:	where to fill a string
+ * @src:	where to copy from
+ * @n:		number of bytes to copy
+ * @pad:	character to pad the remaining bytes
+ */
+void table_fill_string(char *dest, const char *src, size_t n, char pad);
+
 /**
  * write_tables() - Write x86 configuration tables
  *

arch/x86/lib/Makefile

@@ -15,6 +15,7 @@ obj-y	+= gcc.o
 obj-y	+= init_helpers.o
 obj-y	+= interrupts.o
 obj-y	+= lpc-uclass.o
+obj-y	+= mpspec.o
 obj-y += cmd_mtrr.o
 obj-$(CONFIG_SYS_PCAT_INTERRUPTS) += pcat_interrupts.o
 obj-$(CONFIG_SYS_PCAT_TIMER) += pcat_timer.o

arch/x86/lib/mpspec.c

+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Adapted from coreboot src/arch/x86/boot/mpspec.c
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <asm/cpu.h>
+#include <asm/ioapic.h>
+#include <asm/lapic.h>
+#include <asm/mpspec.h>
+#include <asm/tables.h>
+#include <dm/uclass-internal.h>
+
+struct mp_config_table *mp_write_floating_table(struct mp_floating_table *mf)
+{
+	u32 mc;
+
+	memcpy(mf->mpf_signature, MPF_SIGNATURE, 4);
+	mf->mpf_physptr = (u32)mf + sizeof(struct mp_floating_table);
+	mf->mpf_length = 1;
+	mf->mpf_spec = MPSPEC_V14;
+	mf->mpf_checksum = 0;
+	/* We don't use the default configuration table */
+	mf->mpf_feature1 = 0;
+	/* Indicate that virtual wire mode is always implemented */
+	mf->mpf_feature2 = 0;
+	mf->mpf_feature3 = 0;
+	mf->mpf_feature4 = 0;
+	mf->mpf_feature5 = 0;
+	mf->mpf_checksum = table_compute_checksum(mf, mf->mpf_length * 16);
+
+	mc = (u32)mf + sizeof(struct mp_floating_table);
+	return (struct mp_config_table *)mc;
+}
+
+void mp_config_table_init(struct mp_config_table *mc)
+{
+	memcpy(mc->mpc_signature, MPC_SIGNATURE, 4);
+	mc->mpc_length = sizeof(struct mp_config_table);
+	mc->mpc_spec = MPSPEC_V14;
+	mc->mpc_checksum = 0;
+	mc->mpc_oemptr = 0;
+	mc->mpc_oemsize = 0;
+	mc->mpc_entry_count = 0;
+	mc->mpc_lapic = LAPIC_DEFAULT_BASE;
+	mc->mpe_length = 0;
+	mc->mpe_checksum = 0;
+	mc->reserved = 0;
+
+	/* The oem/product id fields are exactly 8/12 bytes long */
+	table_fill_string(mc->mpc_oem, CONFIG_SYS_VENDOR, 8, ' ');
+	table_fill_string(mc->mpc_product, CONFIG_SYS_BOARD, 12, ' ');
+}
+
+void mp_write_processor(struct mp_config_table *mc)
+{
+	struct mpc_config_processor *mpc;
+	struct udevice *dev;
+	u8 boot_apicid, apicver;
+	u32 cpusignature, cpufeature;
+	struct cpuid_result result;
+
+	boot_apicid = lapicid();
+	apicver = lapic_read(LAPIC_LVR) & 0xff;
+	result = cpuid(1);
+	cpusignature = result.eax;
+	cpufeature = result.edx;
+
+	for (uclass_find_first_device(UCLASS_CPU, &dev);
+	     dev;
+	     uclass_find_next_device(&dev)) {
+		struct cpu_platdata *plat = dev_get_parent_platdata(dev);
+		u8 cpuflag = MPC_CPU_EN;
+
+		if (!device_active(dev))
+			continue;
+
+		mpc = (struct mpc_config_processor *)mp_next_mpc_entry(mc);
+		mpc->mpc_type = MP_PROCESSOR;
+		mpc->mpc_apicid = plat->cpu_id;
+		mpc->mpc_apicver = apicver;
+		if (boot_apicid == plat->cpu_id)
+			cpuflag |= MPC_CPU_BP;
+		mpc->mpc_cpuflag = cpuflag;
+		mpc->mpc_cpusignature = cpusignature;
+		mpc->mpc_cpufeature = cpufeature;
+		mpc->mpc_reserved[0] = 0;
+		mpc->mpc_reserved[1] = 0;
+		mp_add_mpc_entry(mc, sizeof(*mpc));
+	}
+}
+
+void mp_write_bus(struct mp_config_table *mc, int id, const char *bustype)
+{
+	struct mpc_config_bus *mpc;
+
+	mpc = (struct mpc_config_bus *)mp_next_mpc_entry(mc);
+	mpc->mpc_type = MP_BUS;
+	mpc->mpc_busid = id;
+	memcpy(mpc->mpc_bustype, bustype, 6);
+	mp_add_mpc_entry(mc, sizeof(*mpc));
+}
+
+void mp_write_ioapic(struct mp_config_table *mc, int id, int ver, u32 apicaddr)
+{
+	struct mpc_config_ioapic *mpc;
+
+	mpc = (struct mpc_config_ioapic *)mp_next_mpc_entry(mc);
+	mpc->mpc_type = MP_IOAPIC;
+	mpc->mpc_apicid = id;
+	mpc->mpc_apicver = ver;
+	mpc->mpc_flags = MPC_APIC_USABLE;
+	mpc->mpc_apicaddr = apicaddr;
+	mp_add_mpc_entry(mc, sizeof(*mpc));
+}
+
+void mp_write_intsrc(struct mp_config_table *mc, int irqtype, int irqflag,
+		     int srcbus, int srcbusirq, int dstapic, int dstirq)
+{
+	struct mpc_config_intsrc *mpc;
+
+	mpc = (struct mpc_config_intsrc *)mp_next_mpc_entry(mc);
+	mpc->mpc_type = MP_INTSRC;
+	mpc->mpc_irqtype = irqtype;
+	mpc->mpc_irqflag = irqflag;
+	mpc->mpc_srcbus = srcbus;
+	mpc->mpc_srcbusirq = srcbusirq;
+	mpc->mpc_dstapic = dstapic;
+	mpc->mpc_dstirq = dstirq;
+	mp_add_mpc_entry(mc, sizeof(*mpc));
+}
+
+void mp_write_pci_intsrc(struct mp_config_table *mc, int irqtype,
+			 int srcbus, int dev, int pin, int dstapic, int dstirq)
+{
+	u8 srcbusirq = (dev << 2) | (pin - 1);
+
+	mp_write_intsrc(mc, irqtype, MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_LOW,
+			srcbus, srcbusirq, dstapic, dstirq);
+}
+
+void mp_write_lintsrc(struct mp_config_table *mc, int irqtype, int irqflag,
+		      int srcbus, int srcbusirq, int destapic, int destlint)
+{
+	struct mpc_config_lintsrc *mpc;
+
+	mpc = (struct mpc_config_lintsrc *)mp_next_mpc_entry(mc);
+	mpc->mpc_type = MP_LINTSRC;
+	mpc->mpc_irqtype = irqtype;
+	mpc->mpc_irqflag = irqflag;
+	mpc->mpc_srcbusid = srcbus;
+	mpc->mpc_srcbusirq = srcbusirq;
+	mpc->mpc_destapic = destapic;
+	mpc->mpc_destlint = destlint;
+	mp_add_mpc_entry(mc, sizeof(*mpc));
+}
+
+void mp_write_address_space(struct mp_config_table *mc,
+			    int busid, int addr_type,
+			    u32 addr_base_low, u32 addr_base_high,
+			    u32 addr_length_low, u32 addr_length_high)
+{
+	struct mp_ext_system_address_space *mpe;
+
+	mpe = (struct mp_ext_system_address_space *)mp_next_mpe_entry(mc);
+	mpe->mpe_type = MPE_SYSTEM_ADDRESS_SPACE;
+	mpe->mpe_length = sizeof(*mpe);
+	mpe->mpe_busid = busid;
+	mpe->mpe_addr_type = addr_type;
+	mpe->mpe_addr_base_low = addr_base_low;
+	mpe->mpe_addr_base_high = addr_base_high;
+	mpe->mpe_addr_length_low = addr_length_low;
+	mpe->mpe_addr_length_high = addr_length_high;
+	mp_add_mpe_entry(mc, (struct mp_ext_config *)mpe);
+}
+
+void mp_write_bus_hierarchy(struct mp_config_table *mc,
+			    int busid, int bus_info, int parent_busid)
+{
+	struct mp_ext_bus_hierarchy *mpe;
+
+	mpe = (struct mp_ext_bus_hierarchy *)mp_next_mpe_entry(mc);
+	mpe->mpe_type = MPE_BUS_HIERARCHY;
+	mpe->mpe_length = sizeof(*mpe);
+	mpe->mpe_busid = busid;
+	mpe->mpe_bus_info = bus_info;
+	mpe->mpe_parent_busid = parent_busid;
+	mpe->reserved[0] = 0;
+	mpe->reserved[1] = 0;
+	mpe->reserved[2] = 0;
+	mp_add_mpe_entry(mc, (struct mp_ext_config *)mpe);
+}
+
+void mp_write_compat_address_space(struct mp_config_table *mc, int busid,
+				   int addr_modifier, u32 range_list)
+{
+	struct mp_ext_compat_address_space *mpe;
+
+	mpe = (struct mp_ext_compat_address_space *)mp_next_mpe_entry(mc);
+	mpe->mpe_type = MPE_COMPAT_ADDRESS_SPACE;
+	mpe->mpe_length = sizeof(*mpe);
+	mpe->mpe_busid = busid;
+	mpe->mpe_addr_modifier = addr_modifier;
+	mpe->mpe_range_list = range_list;
+	mp_add_mpe_entry(mc, (struct mp_ext_config *)mpe);
+}
+
+u32 mptable_finalize(struct mp_config_table *mc)
+{
+	u32 end;
+
+	mc->mpe_checksum = table_compute_checksum((void *)mp_next_mpc_entry(mc),
+						  mc->mpe_length);
+	mc->mpc_checksum = table_compute_checksum(mc, mc->mpc_length);
+	end = mp_next_mpe_entry(mc);
+
+	debug("Write the MP table at: %x - %x\n", (u32)mc, end);
+
+	return end;
+}

arch/x86/lib/tables.c

@@ -20,6 +20,20 @@ u8 table_compute_checksum(void *v, int len)
 	return checksum;
 }
 
+void table_fill_string(char *dest, const char *src, size_t n, char pad)
+{
+	int start, len;
+	int i;
+
+	strncpy(dest, src, n);
+
+	/* Fill the remaining bytes with pad */
+	len = strlen(src);
+	start = len < n ? len : n;
+	for (i = start; i < n; i++)
+		dest[i] = pad;
+}
+
 void write_tables(void)
 {
 	u32 __maybe_unused rom_table_end = ROM_TABLE_ADDR;