This patch adds the ability to load and link ACPI tables provided by QEMU. QEMU tells guests how to load and patch ACPI tables through its fw_cfg interface, by adding a firmware file 'etc/table-loader'. Guests are supposed to parse this file and execute corresponding QEMU commands. Signed-off-by: Miao Yan <yanmiaobest@gmail.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
572 lines
14 KiB
C
572 lines
14 KiB
C
/*
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* (C) Copyright 2015 Miao Yan <yanmiaoebst@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 <asm/io.h>
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#include <asm/fw_cfg.h>
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#include <asm/tables.h>
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#include <asm/e820.h>
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#include <linux/list.h>
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#include <memalign.h>
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static bool fwcfg_present;
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static bool fwcfg_dma_present;
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static LIST_HEAD(fw_list);
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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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uint32_t i = 0;
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uint8_t *data = address;
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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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outw(entry, FW_CONTROL_PORT);
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while (size--)
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data[i++] = inb(FW_DATA_PORT);
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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_dma_read_entry: addr %p, length %u control 0x%x\n",
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address, size, be32_to_cpu(dma.control));
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outl(cpu_to_be32((uint32_t)&dma), FW_DMA_PORT_HIGH);
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while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_ERROR)
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__asm__ __volatile__ ("pause");
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}
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static bool qemu_fwcfg_present(void)
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{
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uint32_t qemu;
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qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
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return be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE;
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}
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static bool qemu_fwcfg_dma_present(void)
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{
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uint8_t dma_enabled;
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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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return true;
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return false;
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}
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static void qemu_fwcfg_read_entry(uint16_t entry,
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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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/*
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* This function prepares kernel for zboot. It loads kernel data
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* to 'load_addr', initrd to 'initrd_addr' and kernel command
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* line using qemu fw_cfg interface.
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*/
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static int qemu_fwcfg_setup_kernel(void *load_addr, void *initrd_addr)
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{
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char *data_addr;
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uint32_t setup_size, kernel_size, cmdline_size, initrd_size;
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qemu_fwcfg_read_entry(FW_CFG_SETUP_SIZE, 4, &setup_size);
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qemu_fwcfg_read_entry(FW_CFG_KERNEL_SIZE, 4, &kernel_size);
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if (setup_size == 0 || kernel_size == 0) {
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printf("warning: no kernel available\n");
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return -1;
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}
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data_addr = load_addr;
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qemu_fwcfg_read_entry(FW_CFG_SETUP_DATA,
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le32_to_cpu(setup_size), data_addr);
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data_addr += le32_to_cpu(setup_size);
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qemu_fwcfg_read_entry(FW_CFG_KERNEL_DATA,
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le32_to_cpu(kernel_size), data_addr);
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data_addr += le32_to_cpu(kernel_size);
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data_addr = initrd_addr;
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qemu_fwcfg_read_entry(FW_CFG_INITRD_SIZE, 4, &initrd_size);
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if (initrd_size == 0) {
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printf("warning: no initrd available\n");
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} else {
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qemu_fwcfg_read_entry(FW_CFG_INITRD_DATA,
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le32_to_cpu(initrd_size), data_addr);
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data_addr += le32_to_cpu(initrd_size);
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}
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qemu_fwcfg_read_entry(FW_CFG_CMDLINE_SIZE, 4, &cmdline_size);
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if (cmdline_size) {
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qemu_fwcfg_read_entry(FW_CFG_CMDLINE_DATA,
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le32_to_cpu(cmdline_size), data_addr);
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/*
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* if kernel cmdline only contains '\0', (e.g. no -append
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* when invoking qemu), do not update bootargs
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*/
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if (*data_addr != '\0') {
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if (setenv("bootargs", data_addr) < 0)
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printf("warning: unable to change bootargs\n");
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}
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}
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printf("loading kernel to address %p size %x", load_addr,
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le32_to_cpu(kernel_size));
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if (initrd_size)
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printf(" initrd %p size %x\n",
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initrd_addr,
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le32_to_cpu(initrd_size));
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else
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printf("\n");
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return 0;
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}
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static 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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#ifdef CONFIG_QEMU_ACPI_TABLE
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static 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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/*
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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,
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unsigned long *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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unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
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{
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entries[0].addr = 0;
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entries[0].size = ISA_START_ADDRESS;
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entries[0].type = E820_RAM;
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entries[1].addr = ISA_START_ADDRESS;
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entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
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entries[1].type = E820_RESERVED;
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/*
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* since we use memalign(malloc) to allocate high memory for
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* storing ACPI tables, we need to reserve them in e820 tables,
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* otherwise kernel will reclaim them and data will be corrupted
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*/
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entries[2].addr = ISA_END_ADDRESS;
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entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
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entries[2].type = E820_RAM;
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/* for simplicity, reserve entire malloc space */
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entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
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entries[3].size = TOTAL_MALLOC_LEN;
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entries[3].type = E820_RESERVED;
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entries[4].addr = gd->relocaddr;
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entries[4].size = gd->ram_size - gd->relocaddr;
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entries[4].type = E820_RESERVED;
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entries[5].addr = CONFIG_PCIE_ECAM_BASE;
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entries[5].size = CONFIG_PCIE_ECAM_SIZE;
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entries[5].type = E820_RESERVED;
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return 6;
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}
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/* This function loads and patches ACPI tables provided by QEMU */
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unsigned long write_acpi_tables(unsigned long 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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struct list_head *list;
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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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list_for_each(list, &fw_list) {
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file = list_entry(list, struct fw_file, list);
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if (file->addr)
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free((void *)file->addr);
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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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static int qemu_fwcfg_list_firmware(void)
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{
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int ret;
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struct list_head *entry;
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struct fw_file *file;
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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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return ret;
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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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printf("%-56s\n", file->cfg.name);
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}
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return 0;
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}
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void qemu_fwcfg_init(void)
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{
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fwcfg_present = qemu_fwcfg_present();
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if (fwcfg_present)
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fwcfg_dma_present = qemu_fwcfg_dma_present();
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}
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static int qemu_fwcfg_do_list(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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if (qemu_fwcfg_list_firmware() < 0)
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return CMD_RET_FAILURE;
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return 0;
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}
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static int qemu_fwcfg_do_cpus(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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int ret = qemu_fwcfg_online_cpus();
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if (ret < 0) {
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printf("QEMU fw_cfg interface not found\n");
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return CMD_RET_FAILURE;
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}
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printf("%d cpu(s) online\n", qemu_fwcfg_online_cpus());
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return 0;
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}
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static int qemu_fwcfg_do_load(cmd_tbl_t *cmdtp, int flag,
|
|
int argc, char * const argv[])
|
|
{
|
|
char *env;
|
|
void *load_addr;
|
|
void *initrd_addr;
|
|
|
|
env = getenv("loadaddr");
|
|
load_addr = env ?
|
|
(void *)simple_strtoul(env, NULL, 16) :
|
|
(void *)CONFIG_LOADADDR;
|
|
|
|
env = getenv("ramdiskaddr");
|
|
initrd_addr = env ?
|
|
(void *)simple_strtoul(env, NULL, 16) :
|
|
(void *)CONFIG_RAMDISK_ADDR;
|
|
|
|
if (argc == 2) {
|
|
load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
|
|
initrd_addr = (void *)simple_strtoul(argv[1], NULL, 16);
|
|
} else if (argc == 1) {
|
|
load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
|
|
}
|
|
|
|
return qemu_fwcfg_setup_kernel(load_addr, initrd_addr);
|
|
}
|
|
|
|
static cmd_tbl_t fwcfg_commands[] = {
|
|
U_BOOT_CMD_MKENT(list, 0, 1, qemu_fwcfg_do_list, "", ""),
|
|
U_BOOT_CMD_MKENT(cpus, 0, 1, qemu_fwcfg_do_cpus, "", ""),
|
|
U_BOOT_CMD_MKENT(load, 2, 1, qemu_fwcfg_do_load, "", ""),
|
|
};
|
|
|
|
static int do_qemu_fw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
int ret;
|
|
cmd_tbl_t *fwcfg_cmd;
|
|
|
|
if (!fwcfg_present) {
|
|
printf("QEMU fw_cfg interface not found\n");
|
|
return CMD_RET_USAGE;
|
|
}
|
|
|
|
fwcfg_cmd = find_cmd_tbl(argv[1], fwcfg_commands,
|
|
ARRAY_SIZE(fwcfg_commands));
|
|
argc -= 2;
|
|
argv += 2;
|
|
if (!fwcfg_cmd || argc > fwcfg_cmd->maxargs)
|
|
return CMD_RET_USAGE;
|
|
|
|
ret = fwcfg_cmd->cmd(fwcfg_cmd, flag, argc, argv);
|
|
|
|
return cmd_process_error(fwcfg_cmd, ret);
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
qfw, 4, 1, do_qemu_fw,
|
|
"QEMU firmware interface",
|
|
"<command>\n"
|
|
" - list : print firmware(s) currently loaded\n"
|
|
" - cpus : print online cpu number\n"
|
|
" - load <kernel addr> <initrd addr> : load kernel and initrd (if any), and setup for zboot\n"
|
|
)
|