/*
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* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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#include <malloc.h>
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#include <qfw.h>
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#include <asm/io.h>
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#ifdef CONFIG_GENERATE_ACPI_TABLE
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#include <asm/tables.h>
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#endif
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#include <linux/list.h>
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static bool fwcfg_present;
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static bool fwcfg_dma_present;
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static struct fw_cfg_arch_ops *fwcfg_arch_ops;
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static LIST_HEAD(fw_list);
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#ifdef CONFIG_GENERATE_ACPI_TABLE
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/*
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* This function allocates memory for ACPI tables
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*
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* @entry : BIOS linker command entry which tells where to allocate memory
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* (either high memory or low memory)
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* @addr : The address that should be used for low memory allcation. If the
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* memory allocation request is 'ZONE_HIGH' then this parameter will
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* be ignored.
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* @return: 0 on success, or negative value on failure
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*/
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static int bios_linker_allocate(struct bios_linker_entry *entry, ulong *addr)
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{
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uint32_t size, align;
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struct fw_file *file;
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unsigned long aligned_addr;
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align = le32_to_cpu(entry->alloc.align);
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/* align must be power of 2 */
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if (align & (align - 1)) {
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printf("error: wrong alignment %u\n", align);
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return -EINVAL;
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}
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file = qemu_fwcfg_find_file(entry->alloc.file);
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if (!file) {
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printf("error: can't find file %s\n", entry->alloc.file);
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return -ENOENT;
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}
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size = be32_to_cpu(file->cfg.size);
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/*
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* ZONE_HIGH means we need to allocate from high memory, since
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* malloc space is already at the end of RAM, so we directly use it.
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* If allocation zone is ZONE_FSEG, then we use the 'addr' passed
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* in which is low memory
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*/
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if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
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aligned_addr = (unsigned long)memalign(align, size);
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if (!aligned_addr) {
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printf("error: allocating resource\n");
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return -ENOMEM;
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}
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} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
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aligned_addr = ALIGN(*addr, align);
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} else {
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printf("error: invalid allocation zone\n");
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return -EINVAL;
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}
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debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
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file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
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qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
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size, (void *)aligned_addr);
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file->addr = aligned_addr;
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/* adjust address for low memory allocation */
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if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
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*addr = (aligned_addr + size);
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return 0;
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}
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/*
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* This function patches ACPI tables previously loaded
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* by bios_linker_allocate()
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*
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* @entry : BIOS linker command entry which tells how to patch
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* ACPI tables
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* @return: 0 on success, or negative value on failure
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*/
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static int bios_linker_add_pointer(struct bios_linker_entry *entry)
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{
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struct fw_file *dest, *src;
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uint32_t offset = le32_to_cpu(entry->pointer.offset);
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uint64_t pointer = 0;
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dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
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if (!dest || !dest->addr)
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return -ENOENT;
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src = qemu_fwcfg_find_file(entry->pointer.src_file);
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if (!src || !src->addr)
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return -ENOENT;
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debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
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dest->addr, src->addr, offset, entry->pointer.size, pointer);
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memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
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pointer = le64_to_cpu(pointer);
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pointer += (unsigned long)src->addr;
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pointer = cpu_to_le64(pointer);
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memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
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return 0;
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}
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/*
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* This function updates checksum fields of ACPI tables previously loaded
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* by bios_linker_allocate()
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*
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* @entry : BIOS linker command entry which tells where to update ACPI table
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* checksums
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* @return: 0 on success, or negative value on failure
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*/
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static int bios_linker_add_checksum(struct bios_linker_entry *entry)
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{
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struct fw_file *file;
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uint8_t *data, cksum = 0;
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uint8_t *cksum_start;
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file = qemu_fwcfg_find_file(entry->cksum.file);
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if (!file || !file->addr)
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return -ENOENT;
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data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
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cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
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cksum = table_compute_checksum(cksum_start,
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le32_to_cpu(entry->cksum.length));
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*data = cksum;
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return 0;
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}
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/* This function loads and patches ACPI tables provided by QEMU */
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ulong write_acpi_tables(ulong addr)
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{
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int i, ret = 0;
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struct fw_file *file;
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struct bios_linker_entry *table_loader;
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struct bios_linker_entry *entry;
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uint32_t size;
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/* make sure fw_list is loaded */
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ret = qemu_fwcfg_read_firmware_list();
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if (ret) {
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printf("error: can't read firmware file list\n");
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return addr;
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}
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file = qemu_fwcfg_find_file("etc/table-loader");
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if (!file) {
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printf("error: can't find etc/table-loader\n");
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return addr;
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}
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size = be32_to_cpu(file->cfg.size);
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if ((size % sizeof(*entry)) != 0) {
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printf("error: table-loader maybe corrupted\n");
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return addr;
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}
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table_loader = malloc(size);
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if (!table_loader) {
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printf("error: no memory for table-loader\n");
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return addr;
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}
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qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
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size, table_loader);
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for (i = 0; i < (size / sizeof(*entry)); i++) {
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entry = table_loader + i;
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switch (le32_to_cpu(entry->command)) {
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case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
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ret = bios_linker_allocate(entry, &addr);
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if (ret)
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goto out;
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break;
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case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
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ret = bios_linker_add_pointer(entry);
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if (ret)
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goto out;
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break;
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case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
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ret = bios_linker_add_checksum(entry);
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if (ret)
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goto out;
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break;
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default:
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break;
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}
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}
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out:
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if (ret) {
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struct fw_cfg_file_iter iter;
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for (file = qemu_fwcfg_file_iter_init(&iter);
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!qemu_fwcfg_file_iter_end(&iter);
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file = qemu_fwcfg_file_iter_next(&iter)) {
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if (file->addr) {
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free((void *)file->addr);
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file->addr = 0;
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}
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}
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}
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free(table_loader);
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return addr;
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}
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#endif
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/* Read configuration item using fw_cfg PIO interface */
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static void qemu_fwcfg_read_entry_pio(uint16_t entry,
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uint32_t size, void *address)
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{
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debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
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entry, size, address);
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return fwcfg_arch_ops->arch_read_pio(entry, size, address);
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}
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/* Read configuration item using fw_cfg DMA interface */
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static void qemu_fwcfg_read_entry_dma(uint16_t entry,
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uint32_t size, void *address)
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{
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struct fw_cfg_dma_access dma;
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dma.length = cpu_to_be32(size);
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dma.address = cpu_to_be64((uintptr_t)address);
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dma.control = cpu_to_be32(FW_CFG_DMA_READ);
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/*
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* writting FW_CFG_INVALID will cause read operation to resume at
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* last offset, otherwise read will start at offset 0
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*/
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if (entry != FW_CFG_INVALID)
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dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
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barrier();
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debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
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entry, size, address, be32_to_cpu(dma.control));
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fwcfg_arch_ops->arch_read_dma(&dma);
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}
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bool qemu_fwcfg_present(void)
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{
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return fwcfg_present;
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}
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bool qemu_fwcfg_dma_present(void)
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{
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return fwcfg_dma_present;
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}
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void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
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{
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if (fwcfg_dma_present)
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qemu_fwcfg_read_entry_dma(entry, length, address);
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else
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qemu_fwcfg_read_entry_pio(entry, length, address);
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}
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int qemu_fwcfg_online_cpus(void)
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{
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uint16_t nb_cpus;
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if (!fwcfg_present)
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return -ENODEV;
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qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
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return le16_to_cpu(nb_cpus);
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}
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int qemu_fwcfg_read_firmware_list(void)
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{
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int i;
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uint32_t count;
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struct fw_file *file;
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struct list_head *entry;
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/* don't read it twice */
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if (!list_empty(&fw_list))
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return 0;
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qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
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if (!count)
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return 0;
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count = be32_to_cpu(count);
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for (i = 0; i < count; i++) {
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file = malloc(sizeof(*file));
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if (!file) {
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printf("error: allocating resource\n");
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goto err;
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}
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qemu_fwcfg_read_entry(FW_CFG_INVALID,
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sizeof(struct fw_cfg_file), &file->cfg);
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file->addr = 0;
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list_add_tail(&file->list, &fw_list);
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}
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return 0;
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err:
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list_for_each(entry, &fw_list) {
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file = list_entry(entry, struct fw_file, list);
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free(file);
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}
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return -ENOMEM;
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}
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struct fw_file *qemu_fwcfg_find_file(const char *name)
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{
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struct list_head *entry;
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struct fw_file *file;
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list_for_each(entry, &fw_list) {
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file = list_entry(entry, struct fw_file, list);
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if (!strcmp(file->cfg.name, name))
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return file;
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}
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return NULL;
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}
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struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter)
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{
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iter->entry = fw_list.next;
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return list_entry((struct list_head *)iter->entry,
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struct fw_file, list);
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}
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struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter)
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{
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iter->entry = ((struct list_head *)iter->entry)->next;
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return list_entry((struct list_head *)iter->entry,
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struct fw_file, list);
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}
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bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
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{
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return iter->entry == &fw_list;
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}
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void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
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{
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uint32_t qemu;
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uint32_t dma_enabled;
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fwcfg_present = false;
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fwcfg_dma_present = false;
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fwcfg_arch_ops = NULL;
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if (!ops || !ops->arch_read_pio || !ops->arch_read_dma)
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return;
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fwcfg_arch_ops = ops;
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qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
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if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)
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fwcfg_present = true;
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if (fwcfg_present) {
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qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
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if (dma_enabled & FW_CFG_DMA_ENABLED)
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fwcfg_dma_present = true;
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}
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}
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