x86: qemu: add fw_cfg support
The QEMU fw_cfg interface allows the guest to retrieve various data information from QEMU. For example, APCI/SMBios tables, number of online cpus, kernel data and command line, etc. This patch adds support for QEMU fw_cfg interface. Signed-off-by: Miao Yan <yanmiaobest@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Miao Yan
Bin Meng
parent
ece5c37f0c
commit
f60df20aa9
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@ -7,5 +7,5 @@
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ifndef CONFIG_EFI_STUB
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obj-y += car.o dram.o
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endif
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obj-y += qemu.o
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obj-y += fw_cfg.o qemu.o
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obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi.o dsdt.o
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@ -0,0 +1,283 @@
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/*
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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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static bool fwcfg_present;
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static bool fwcfg_dma_present;
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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_list_firmware(void)
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{
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int i;
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uint32_t count;
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struct fw_cfg_files *files;
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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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files = malloc(count * sizeof(struct fw_cfg_file));
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if (!files)
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return -ENOMEM;
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files->count = count;
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qemu_fwcfg_read_entry(FW_CFG_INVALID,
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count * sizeof(struct fw_cfg_file),
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files->files);
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for (i = 0; i < files->count; i++)
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printf("%-56s\n", files->files[i].name);
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free(files);
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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,
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int argc, char * const argv[])
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{
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char *env;
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void *load_addr;
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void *initrd_addr;
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env = getenv("loadaddr");
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load_addr = env ?
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(void *)simple_strtoul(env, NULL, 16) :
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(void *)CONFIG_LOADADDR;
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env = getenv("ramdiskaddr");
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initrd_addr = env ?
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(void *)simple_strtoul(env, NULL, 16) :
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(void *)CONFIG_RAMDISK_ADDR;
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if (argc == 2) {
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load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
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initrd_addr = (void *)simple_strtoul(argv[1], NULL, 16);
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} else if (argc == 1) {
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load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
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}
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return qemu_fwcfg_setup_kernel(load_addr, initrd_addr);
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}
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static cmd_tbl_t fwcfg_commands[] = {
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U_BOOT_CMD_MKENT(list, 0, 1, qemu_fwcfg_do_list, "", ""),
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U_BOOT_CMD_MKENT(cpus, 0, 1, qemu_fwcfg_do_cpus, "", ""),
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U_BOOT_CMD_MKENT(load, 2, 1, qemu_fwcfg_do_load, "", ""),
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};
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static int do_qemu_fw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int ret;
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cmd_tbl_t *fwcfg_cmd;
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if (!fwcfg_present) {
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printf("QEMU fw_cfg interface not found\n");
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return CMD_RET_USAGE;
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}
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fwcfg_cmd = find_cmd_tbl(argv[1], fwcfg_commands,
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ARRAY_SIZE(fwcfg_commands));
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argc -= 2;
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argv += 2;
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if (!fwcfg_cmd || argc > fwcfg_cmd->maxargs)
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return CMD_RET_USAGE;
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ret = fwcfg_cmd->cmd(fwcfg_cmd, flag, argc, argv);
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return cmd_process_error(fwcfg_cmd, ret);
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}
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U_BOOT_CMD(
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qfw, 4, 1, do_qemu_fw,
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"QEMU firmware interface",
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"<command>\n"
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" - list : print firmware(s) currently loaded\n"
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" - cpus : print online cpu number\n"
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" - load <kernel addr> <initrd addr> : load kernel and initrd (if any), and setup for zboot\n"
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)
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@ -11,6 +11,7 @@
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#include <asm/processor.h>
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#include <asm/arch/device.h>
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#include <asm/arch/qemu.h>
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#include <asm/fw_cfg.h>
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static bool i440fx;
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@ -57,6 +58,8 @@ static void qemu_chipset_init(void)
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x86_pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR,
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CONFIG_PCIE_ECAM_BASE | BAR_EN);
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}
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qemu_fwcfg_init();
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}
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int arch_cpu_init(void)
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@ -0,0 +1,93 @@
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/*
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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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#ifndef __FW_CFG__
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#define __FW_CFG__
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#define FW_CONTROL_PORT 0x510
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#define FW_DATA_PORT 0x511
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#define FW_DMA_PORT_LOW 0x514
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#define FW_DMA_PORT_HIGH 0x518
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enum qemu_fwcfg_items {
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FW_CFG_SIGNATURE = 0x00,
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FW_CFG_ID = 0x01,
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FW_CFG_UUID = 0x02,
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FW_CFG_RAM_SIZE = 0x03,
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FW_CFG_NOGRAPHIC = 0x04,
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FW_CFG_NB_CPUS = 0x05,
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FW_CFG_MACHINE_ID = 0x06,
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FW_CFG_KERNEL_ADDR = 0x07,
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FW_CFG_KERNEL_SIZE = 0x08,
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FW_CFG_KERNEL_CMDLINE = 0x09,
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FW_CFG_INITRD_ADDR = 0x0a,
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FW_CFG_INITRD_SIZE = 0x0b,
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FW_CFG_BOOT_DEVICE = 0x0c,
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FW_CFG_NUMA = 0x0d,
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FW_CFG_BOOT_MENU = 0x0e,
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FW_CFG_MAX_CPUS = 0x0f,
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FW_CFG_KERNEL_ENTRY = 0x10,
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FW_CFG_KERNEL_DATA = 0x11,
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FW_CFG_INITRD_DATA = 0x12,
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FW_CFG_CMDLINE_ADDR = 0x13,
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FW_CFG_CMDLINE_SIZE = 0x14,
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FW_CFG_CMDLINE_DATA = 0x15,
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FW_CFG_SETUP_ADDR = 0x16,
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FW_CFG_SETUP_SIZE = 0x17,
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FW_CFG_SETUP_DATA = 0x18,
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FW_CFG_FILE_DIR = 0x19,
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FW_CFG_FILE_FIRST = 0x20,
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FW_CFG_WRITE_CHANNEL = 0x4000,
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FW_CFG_ARCH_LOCAL = 0x8000,
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FW_CFG_INVALID = 0xffff,
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};
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#define FW_CFG_FILE_SLOTS 0x10
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#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
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#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
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#define FW_CFG_MAX_FILE_PATH 56
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#define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
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#define FW_CFG_DMA_ERROR (1 << 0)
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#define FW_CFG_DMA_READ (1 << 1)
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#define FW_CFG_DMA_SKIP (1 << 2)
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#define FW_CFG_DMA_SELECT (1 << 3)
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#define FW_CFG_DMA_ENABLED (1 << 1)
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struct fw_cfg_file {
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__be32 size;
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__be16 select;
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__be16 reserved;
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char name[FW_CFG_MAX_FILE_PATH];
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};
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struct fw_cfg_files {
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__be32 count;
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struct fw_cfg_file files[];
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};
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struct fw_cfg_dma_access {
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__be32 control;
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__be32 length;
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__be64 address;
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};
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/**
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* Initialize QEMU fw_cfg interface
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*/
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void qemu_fwcfg_init(void);
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/**
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* Get system cpu number
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*
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* @return: cpu number in system
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*/
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int qemu_fwcfg_online_cpus(void);
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#endif
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