[U-Boot] [PATCH v2] x86: qemu: Move qfw command over to cmd and add Kconfig entry
Miao Yan
yanmiaobest at gmail.com
Mon May 9 08:32:51 CEST 2016
2016-05-06 22:40 GMT+08:00 Tom Rini <trini at konsulko.com>:
> - Move the command portion of arch/x86/cpu/qemu/fw_cfg.c into
> cmd/qemu_fw_cfg.c
> - Move arch/x86/include/asm/fw_cfg.h to include/qemu_fw_cfg.h
> - Rename ACPI table portion to arch/x86/cpu/qemu/acpi_table.c
>
> Signed-off-by: Tom Rini <trini at konsulko.com>
> ---
> Changes in v2:
> - Depend on X86 (per Miao Yan)
I am afraid this still doesn't build. At least you need to make the
ACPI stuff depend on the new config option CONFIG_CMD_QEMU_FW_CFG, as
well as some tweaks in qemu.c and mp_init.c because they call
functions from the origin fw_cfg.c and they used to be guarded by
CONFIG_QEMU, something like the following diff:
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4ef27dc..efede32 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -444,7 +444,7 @@ config GENERATE_ACPI_TABLE
config QEMU_ACPI_TABLE
bool "Load ACPI table from QEMU fw_cfg interface"
- depends on GENERATE_ACPI_TABLE && QEMU
+ depends on GENERATE_ACPI_TABLE && CMD_QEMU_FW_CFG
default y
help
By default, U-Boot generates its own ACPI tables. This option, if
diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c
index 13bec7a..7b870b7 100644
--- a/arch/x86/cpu/mp_init.c
+++ b/arch/x86/cpu/mp_init.c
@@ -420,7 +420,7 @@ static int init_bsp(struct udevice **devp)
return 0;
}
-#ifdef CONFIG_QEMU
+#ifdef CONFIG_CMD_QEMU_FW_CFG
static int qemu_cpu_fixup(void)
{
int ret;
@@ -496,7 +496,7 @@ int mp_init(struct mp_params *p)
if (ret)
return ret;
-#ifdef CONFIG_QEMU
+#ifdef CONFIG_CMD_QEMU_FW_CFG
ret = qemu_cpu_fixup();
if (ret)
return ret;
diff --git a/arch/x86/cpu/qemu/Makefile b/arch/x86/cpu/qemu/Makefile
index 97b965c..d0e146e 100644
--- a/arch/x86/cpu/qemu/Makefile
+++ b/arch/x86/cpu/qemu/Makefile
@@ -7,5 +7,11 @@
ifndef CONFIG_EFI_STUB
obj-y += car.o dram.o
endif
-obj-y += cpu.o qemu.o
+
+obj-y += qemu.o
+
+ifdef CONFIG_CMD_QEMU_FW_CFG
+obj-y += cpu.o
obj-$(CONFIG_QEMU_ACPI_TABLE) += acpi_table.o
+endif
+
diff --git a/arch/x86/cpu/qemu/qemu.c b/arch/x86/cpu/qemu/qemu.c
index b41e4ec..2730a5f 100644
--- a/arch/x86/cpu/qemu/qemu.c
+++ b/arch/x86/cpu/qemu/qemu.c
@@ -88,7 +88,9 @@ static void qemu_chipset_init(void)
enable_pm_ich9();
}
+#ifdef CONFIG_CMD_QEMU_FW_CFG
qemu_fwcfg_init();
+#endif
}
int arch_cpu_init(void)
> ---
> arch/x86/cpu/mp_init.c | 2 +-
> arch/x86/cpu/qemu/Makefile | 3 +-
> arch/x86/cpu/qemu/acpi_table.c | 243 ++++++++++++++++++
> arch/x86/cpu/qemu/cpu.c | 2 +-
> arch/x86/cpu/qemu/fw_cfg.c | 570 -----------------------------------------
> arch/x86/cpu/qemu/qemu.c | 2 +-
> arch/x86/include/asm/fw_cfg.h | 157 ------------
> arch/x86/lib/acpi_table.c | 2 +-
> cmd/Kconfig | 7 +
> cmd/Makefile | 1 +
> cmd/qemu_fw_cfg.c | 343 +++++++++++++++++++++++++
> configs/qemu-x86_defconfig | 1 +
> include/qemu_fw_cfg.h | 162 ++++++++++++
> 13 files changed, 763 insertions(+), 732 deletions(-)
> create mode 100644 arch/x86/cpu/qemu/acpi_table.c
> delete mode 100644 arch/x86/cpu/qemu/fw_cfg.c
> delete mode 100644 arch/x86/include/asm/fw_cfg.h
> create mode 100644 cmd/qemu_fw_cfg.c
> create mode 100644 include/qemu_fw_cfg.h
>
> diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c
> index 2604a68..13bec7a 100644
> --- a/arch/x86/cpu/mp_init.c
> +++ b/arch/x86/cpu/mp_init.c
> @@ -11,6 +11,7 @@
> #include <dm.h>
> #include <errno.h>
> #include <malloc.h>
> +#include <qemu_fw_cfg.h>
> #include <asm/atomic.h>
> #include <asm/cpu.h>
> #include <asm/interrupt.h>
> @@ -21,7 +22,6 @@
> #include <asm/mtrr.h>
> #include <asm/processor.h>
> #include <asm/sipi.h>
> -#include <asm/fw_cfg.h>
> #include <dm/device-internal.h>
> #include <dm/uclass-internal.h>
> #include <dm/lists.h>
> diff --git a/arch/x86/cpu/qemu/Makefile b/arch/x86/cpu/qemu/Makefile
> index 6eeddf1..97b965c 100644
> --- a/arch/x86/cpu/qemu/Makefile
> +++ b/arch/x86/cpu/qemu/Makefile
> @@ -7,4 +7,5 @@
> ifndef CONFIG_EFI_STUB
> obj-y += car.o dram.o
> endif
> -obj-y += cpu.o fw_cfg.o qemu.o
> +obj-y += cpu.o qemu.o
> +obj-$(CONFIG_QEMU_ACPI_TABLE) += acpi_table.o
> diff --git a/arch/x86/cpu/qemu/acpi_table.c b/arch/x86/cpu/qemu/acpi_table.c
> new file mode 100644
> index 0000000..49381ac
> --- /dev/null
> +++ b/arch/x86/cpu/qemu/acpi_table.c
> @@ -0,0 +1,243 @@
> +/*
> + * (C) Copyright 2015 Miao Yan <yanmiaobest at gmail.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <errno.h>
> +#include <malloc.h>
> +#include <qemu_fw_cfg.h>
> +#include <asm/io.h>
> +#include <asm/tables.h>
> +#include <asm/e820.h>
> +#include <linux/list.h>
> +#include <memalign.h>
> +
> +/*
> + * This function allocates memory for ACPI tables
> + *
> + * @entry : BIOS linker command entry which tells where to allocate memory
> + * (either high memory or low memory)
> + * @addr : The address that should be used for low memory allcation. If the
> + * memory allocation request is 'ZONE_HIGH' then this parameter will
> + * be ignored.
> + * @return: 0 on success, or negative value on failure
> + */
> +static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
> +{
> + uint32_t size, align;
> + struct fw_file *file;
> + unsigned long aligned_addr;
> +
> + align = le32_to_cpu(entry->alloc.align);
> + /* align must be power of 2 */
> + if (align & (align - 1)) {
> + printf("error: wrong alignment %u\n", align);
> + return -EINVAL;
> + }
> +
> + file = qemu_fwcfg_find_file(entry->alloc.file);
> + if (!file) {
> + printf("error: can't find file %s\n", entry->alloc.file);
> + return -ENOENT;
> + }
> +
> + size = be32_to_cpu(file->cfg.size);
> +
> + /*
> + * ZONE_HIGH means we need to allocate from high memory, since
> + * malloc space is already at the end of RAM, so we directly use it.
> + * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
> + * in which is low memory
> + */
> + if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
> + aligned_addr = (unsigned long)memalign(align, size);
> + if (!aligned_addr) {
> + printf("error: allocating resource\n");
> + return -ENOMEM;
> + }
> + } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
> + aligned_addr = ALIGN(*addr, align);
> + } else {
> + printf("error: invalid allocation zone\n");
> + return -EINVAL;
> + }
> +
> + debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
> + file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
> +
> + qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
> + size, (void *)aligned_addr);
> + file->addr = aligned_addr;
> +
> + /* adjust address for low memory allocation */
> + if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
> + *addr = (aligned_addr + size);
> +
> + return 0;
> +}
> +
> +/*
> + * This function patches ACPI tables previously loaded
> + * by bios_linker_allocate()
> + *
> + * @entry : BIOS linker command entry which tells how to patch
> + * ACPI tables
> + * @return: 0 on success, or negative value on failure
> + */
> +static int bios_linker_add_pointer(struct bios_linker_entry *entry)
> +{
> + struct fw_file *dest, *src;
> + uint32_t offset = le32_to_cpu(entry->pointer.offset);
> + uint64_t pointer = 0;
> +
> + dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
> + if (!dest || !dest->addr)
> + return -ENOENT;
> + src = qemu_fwcfg_find_file(entry->pointer.src_file);
> + if (!src || !src->addr)
> + return -ENOENT;
> +
> + debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
> + dest->addr, src->addr, offset, entry->pointer.size, pointer);
> +
> + memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
> + pointer = le64_to_cpu(pointer);
> + pointer += (unsigned long)src->addr;
> + pointer = cpu_to_le64(pointer);
> + memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
> +
> + return 0;
> +}
> +
> +/*
> + * This function updates checksum fields of ACPI tables previously loaded
> + * by bios_linker_allocate()
> + *
> + * @entry : BIOS linker command entry which tells where to update ACPI table
> + * checksums
> + * @return: 0 on success, or negative value on failure
> + */
> +static int bios_linker_add_checksum(struct bios_linker_entry *entry)
> +{
> + struct fw_file *file;
> + uint8_t *data, cksum = 0;
> + uint8_t *cksum_start;
> +
> + file = qemu_fwcfg_find_file(entry->cksum.file);
> + if (!file || !file->addr)
> + return -ENOENT;
> +
> + data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
> + cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
> + cksum = table_compute_checksum(cksum_start,
> + le32_to_cpu(entry->cksum.length));
> + *data = cksum;
> +
> + return 0;
> +}
> +
> +unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
> +{
> + entries[0].addr = 0;
> + entries[0].size = ISA_START_ADDRESS;
> + entries[0].type = E820_RAM;
> +
> + entries[1].addr = ISA_START_ADDRESS;
> + entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
> + entries[1].type = E820_RESERVED;
> +
> + /*
> + * since we use memalign(malloc) to allocate high memory for
> + * storing ACPI tables, we need to reserve them in e820 tables,
> + * otherwise kernel will reclaim them and data will be corrupted
> + */
> + entries[2].addr = ISA_END_ADDRESS;
> + entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
> + entries[2].type = E820_RAM;
> +
> + /* for simplicity, reserve entire malloc space */
> + entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
> + entries[3].size = TOTAL_MALLOC_LEN;
> + entries[3].type = E820_RESERVED;
> +
> + entries[4].addr = gd->relocaddr;
> + entries[4].size = gd->ram_size - gd->relocaddr;
> + entries[4].type = E820_RESERVED;
> +
> + entries[5].addr = CONFIG_PCIE_ECAM_BASE;
> + entries[5].size = CONFIG_PCIE_ECAM_SIZE;
> + entries[5].type = E820_RESERVED;
> +
> + return 6;
> +}
> +
> +/* This function loads and patches ACPI tables provided by QEMU */
> +u32 write_acpi_tables(u32 addr)
> +{
> + int i, ret = 0;
> + struct fw_file *file;
> + struct bios_linker_entry *table_loader;
> + struct bios_linker_entry *entry;
> + uint32_t size;
> +
> + /* make sure fw_list is loaded */
> + ret = qemu_fwcfg_read_firmware_list();
> + if (ret) {
> + printf("error: can't read firmware file list\n");
> + return addr;
> + }
> +
> + file = qemu_fwcfg_find_file("etc/table-loader");
> + if (!file) {
> + printf("error: can't find etc/table-loader\n");
> + return addr;
> + }
> +
> + size = be32_to_cpu(file->cfg.size);
> + if ((size % sizeof(*entry)) != 0) {
> + printf("error: table-loader maybe corrupted\n");
> + return addr;
> + }
> +
> + table_loader = malloc(size);
> + if (!table_loader) {
> + printf("error: no memory for table-loader\n");
> + return addr;
> + }
> +
> + qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
> + size, table_loader);
> +
> + for (i = 0; i < (size / sizeof(*entry)); i++) {
> + entry = table_loader + i;
> + switch (le32_to_cpu(entry->command)) {
> + case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
> + ret = bios_linker_allocate(entry, &addr);
> + if (ret)
> + goto out;
> + break;
> + case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
> + ret = bios_linker_add_pointer(entry);
> + if (ret)
> + goto out;
> + break;
> + case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
> + ret = bios_linker_add_checksum(entry);
> + if (ret)
> + goto out;
> + break;
> + default:
> + break;
> + }
> + }
> +
> +out:
> + if (ret)
> + qemu_fwcfg_free_files();
> +
> + free(table_loader);
> + return addr;
> +}
> diff --git a/arch/x86/cpu/qemu/cpu.c b/arch/x86/cpu/qemu/cpu.c
> index a1b70c6..4d2989a 100644
> --- a/arch/x86/cpu/qemu/cpu.c
> +++ b/arch/x86/cpu/qemu/cpu.c
> @@ -8,8 +8,8 @@
> #include <cpu.h>
> #include <dm.h>
> #include <errno.h>
> +#include <qemu_fw_cfg.h>
> #include <asm/cpu.h>
> -#include <asm/fw_cfg.h>
>
> DECLARE_GLOBAL_DATA_PTR;
>
> diff --git a/arch/x86/cpu/qemu/fw_cfg.c b/arch/x86/cpu/qemu/fw_cfg.c
> deleted file mode 100644
> index 2e2794e..0000000
> --- a/arch/x86/cpu/qemu/fw_cfg.c
> +++ /dev/null
> @@ -1,570 +0,0 @@
> -/*
> - * (C) Copyright 2015 Miao Yan <yanmiaobest at gmail.com>
> - *
> - * SPDX-License-Identifier: GPL-2.0+
> - */
> -
> -#include <common.h>
> -#include <command.h>
> -#include <errno.h>
> -#include <malloc.h>
> -#include <asm/io.h>
> -#include <asm/fw_cfg.h>
> -#include <asm/tables.h>
> -#include <asm/e820.h>
> -#include <linux/list.h>
> -#include <memalign.h>
> -
> -static bool fwcfg_present;
> -static bool fwcfg_dma_present;
> -
> -static LIST_HEAD(fw_list);
> -
> -/* Read configuration item using fw_cfg PIO interface */
> -static void qemu_fwcfg_read_entry_pio(uint16_t entry,
> - uint32_t size, void *address)
> -{
> - uint32_t i = 0;
> - uint8_t *data = address;
> -
> - /*
> - * writting FW_CFG_INVALID will cause read operation to resume at
> - * last offset, otherwise read will start at offset 0
> - */
> - if (entry != FW_CFG_INVALID)
> - outw(entry, FW_CONTROL_PORT);
> - while (size--)
> - data[i++] = inb(FW_DATA_PORT);
> -}
> -
> -/* Read configuration item using fw_cfg DMA interface */
> -static void qemu_fwcfg_read_entry_dma(uint16_t entry,
> - uint32_t size, void *address)
> -{
> - struct fw_cfg_dma_access dma;
> -
> - dma.length = cpu_to_be32(size);
> - dma.address = cpu_to_be64((uintptr_t)address);
> - dma.control = cpu_to_be32(FW_CFG_DMA_READ);
> -
> - /*
> - * writting FW_CFG_INVALID will cause read operation to resume at
> - * last offset, otherwise read will start at offset 0
> - */
> - if (entry != FW_CFG_INVALID)
> - dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
> -
> - barrier();
> -
> - debug("qemu_fwcfg_dma_read_entry: addr %p, length %u control 0x%x\n",
> - address, size, be32_to_cpu(dma.control));
> -
> - outl(cpu_to_be32((uint32_t)&dma), FW_DMA_PORT_HIGH);
> -
> - while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_ERROR)
> - __asm__ __volatile__ ("pause");
> -}
> -
> -static bool qemu_fwcfg_present(void)
> -{
> - uint32_t qemu;
> -
> - qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
> - return be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE;
> -}
> -
> -static bool qemu_fwcfg_dma_present(void)
> -{
> - uint8_t dma_enabled;
> -
> - qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
> - if (dma_enabled & FW_CFG_DMA_ENABLED)
> - return true;
> -
> - return false;
> -}
> -
> -static void qemu_fwcfg_read_entry(uint16_t entry,
> - uint32_t length, void *address)
> -{
> - if (fwcfg_dma_present)
> - qemu_fwcfg_read_entry_dma(entry, length, address);
> - else
> - qemu_fwcfg_read_entry_pio(entry, length, address);
> -}
> -
> -int qemu_fwcfg_online_cpus(void)
> -{
> - uint16_t nb_cpus;
> -
> - if (!fwcfg_present)
> - return -ENODEV;
> -
> - qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
> -
> - return le16_to_cpu(nb_cpus);
> -}
> -
> -/*
> - * This function prepares kernel for zboot. It loads kernel data
> - * to 'load_addr', initrd to 'initrd_addr' and kernel command
> - * line using qemu fw_cfg interface.
> - */
> -static int qemu_fwcfg_setup_kernel(void *load_addr, void *initrd_addr)
> -{
> - char *data_addr;
> - uint32_t setup_size, kernel_size, cmdline_size, initrd_size;
> -
> - qemu_fwcfg_read_entry(FW_CFG_SETUP_SIZE, 4, &setup_size);
> - qemu_fwcfg_read_entry(FW_CFG_KERNEL_SIZE, 4, &kernel_size);
> -
> - if (setup_size == 0 || kernel_size == 0) {
> - printf("warning: no kernel available\n");
> - return -1;
> - }
> -
> - data_addr = load_addr;
> - qemu_fwcfg_read_entry(FW_CFG_SETUP_DATA,
> - le32_to_cpu(setup_size), data_addr);
> - data_addr += le32_to_cpu(setup_size);
> -
> - qemu_fwcfg_read_entry(FW_CFG_KERNEL_DATA,
> - le32_to_cpu(kernel_size), data_addr);
> - data_addr += le32_to_cpu(kernel_size);
> -
> - data_addr = initrd_addr;
> - qemu_fwcfg_read_entry(FW_CFG_INITRD_SIZE, 4, &initrd_size);
> - if (initrd_size == 0) {
> - printf("warning: no initrd available\n");
> - } else {
> - qemu_fwcfg_read_entry(FW_CFG_INITRD_DATA,
> - le32_to_cpu(initrd_size), data_addr);
> - data_addr += le32_to_cpu(initrd_size);
> - }
> -
> - qemu_fwcfg_read_entry(FW_CFG_CMDLINE_SIZE, 4, &cmdline_size);
> - if (cmdline_size) {
> - qemu_fwcfg_read_entry(FW_CFG_CMDLINE_DATA,
> - le32_to_cpu(cmdline_size), data_addr);
> - /*
> - * if kernel cmdline only contains '\0', (e.g. no -append
> - * when invoking qemu), do not update bootargs
> - */
> - if (*data_addr != '\0') {
> - if (setenv("bootargs", data_addr) < 0)
> - printf("warning: unable to change bootargs\n");
> - }
> - }
> -
> - printf("loading kernel to address %p size %x", load_addr,
> - le32_to_cpu(kernel_size));
> - if (initrd_size)
> - printf(" initrd %p size %x\n",
> - initrd_addr,
> - le32_to_cpu(initrd_size));
> - else
> - printf("\n");
> -
> - return 0;
> -}
> -
> -static int qemu_fwcfg_read_firmware_list(void)
> -{
> - int i;
> - uint32_t count;
> - struct fw_file *file;
> - struct list_head *entry;
> -
> - /* don't read it twice */
> - if (!list_empty(&fw_list))
> - return 0;
> -
> - qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
> - if (!count)
> - return 0;
> -
> - count = be32_to_cpu(count);
> - for (i = 0; i < count; i++) {
> - file = malloc(sizeof(*file));
> - if (!file) {
> - printf("error: allocating resource\n");
> - goto err;
> - }
> - qemu_fwcfg_read_entry(FW_CFG_INVALID,
> - sizeof(struct fw_cfg_file), &file->cfg);
> - file->addr = 0;
> - list_add_tail(&file->list, &fw_list);
> - }
> -
> - return 0;
> -
> -err:
> - list_for_each(entry, &fw_list) {
> - file = list_entry(entry, struct fw_file, list);
> - free(file);
> - }
> -
> - return -ENOMEM;
> -}
> -
> -#ifdef CONFIG_QEMU_ACPI_TABLE
> -static struct fw_file *qemu_fwcfg_find_file(const char *name)
> -{
> - struct list_head *entry;
> - struct fw_file *file;
> -
> - list_for_each(entry, &fw_list) {
> - file = list_entry(entry, struct fw_file, list);
> - if (!strcmp(file->cfg.name, name))
> - return file;
> - }
> -
> - return NULL;
> -}
> -
> -/*
> - * This function allocates memory for ACPI tables
> - *
> - * @entry : BIOS linker command entry which tells where to allocate memory
> - * (either high memory or low memory)
> - * @addr : The address that should be used for low memory allcation. If the
> - * memory allocation request is 'ZONE_HIGH' then this parameter will
> - * be ignored.
> - * @return: 0 on success, or negative value on failure
> - */
> -static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
> -{
> - uint32_t size, align;
> - struct fw_file *file;
> - unsigned long aligned_addr;
> -
> - align = le32_to_cpu(entry->alloc.align);
> - /* align must be power of 2 */
> - if (align & (align - 1)) {
> - printf("error: wrong alignment %u\n", align);
> - return -EINVAL;
> - }
> -
> - file = qemu_fwcfg_find_file(entry->alloc.file);
> - if (!file) {
> - printf("error: can't find file %s\n", entry->alloc.file);
> - return -ENOENT;
> - }
> -
> - size = be32_to_cpu(file->cfg.size);
> -
> - /*
> - * ZONE_HIGH means we need to allocate from high memory, since
> - * malloc space is already at the end of RAM, so we directly use it.
> - * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
> - * in which is low memory
> - */
> - if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
> - aligned_addr = (unsigned long)memalign(align, size);
> - if (!aligned_addr) {
> - printf("error: allocating resource\n");
> - return -ENOMEM;
> - }
> - } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
> - aligned_addr = ALIGN(*addr, align);
> - } else {
> - printf("error: invalid allocation zone\n");
> - return -EINVAL;
> - }
> -
> - debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
> - file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
> -
> - qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
> - size, (void *)aligned_addr);
> - file->addr = aligned_addr;
> -
> - /* adjust address for low memory allocation */
> - if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
> - *addr = (aligned_addr + size);
> -
> - return 0;
> -}
> -
> -/*
> - * This function patches ACPI tables previously loaded
> - * by bios_linker_allocate()
> - *
> - * @entry : BIOS linker command entry which tells how to patch
> - * ACPI tables
> - * @return: 0 on success, or negative value on failure
> - */
> -static int bios_linker_add_pointer(struct bios_linker_entry *entry)
> -{
> - struct fw_file *dest, *src;
> - uint32_t offset = le32_to_cpu(entry->pointer.offset);
> - uint64_t pointer = 0;
> -
> - dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
> - if (!dest || !dest->addr)
> - return -ENOENT;
> - src = qemu_fwcfg_find_file(entry->pointer.src_file);
> - if (!src || !src->addr)
> - return -ENOENT;
> -
> - debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
> - dest->addr, src->addr, offset, entry->pointer.size, pointer);
> -
> - memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
> - pointer = le64_to_cpu(pointer);
> - pointer += (unsigned long)src->addr;
> - pointer = cpu_to_le64(pointer);
> - memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
> -
> - return 0;
> -}
> -
> -/*
> - * This function updates checksum fields of ACPI tables previously loaded
> - * by bios_linker_allocate()
> - *
> - * @entry : BIOS linker command entry which tells where to update ACPI table
> - * checksums
> - * @return: 0 on success, or negative value on failure
> - */
> -static int bios_linker_add_checksum(struct bios_linker_entry *entry)
> -{
> - struct fw_file *file;
> - uint8_t *data, cksum = 0;
> - uint8_t *cksum_start;
> -
> - file = qemu_fwcfg_find_file(entry->cksum.file);
> - if (!file || !file->addr)
> - return -ENOENT;
> -
> - data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
> - cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
> - cksum = table_compute_checksum(cksum_start,
> - le32_to_cpu(entry->cksum.length));
> - *data = cksum;
> -
> - return 0;
> -}
> -
> -unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
> -{
> - entries[0].addr = 0;
> - entries[0].size = ISA_START_ADDRESS;
> - entries[0].type = E820_RAM;
> -
> - entries[1].addr = ISA_START_ADDRESS;
> - entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
> - entries[1].type = E820_RESERVED;
> -
> - /*
> - * since we use memalign(malloc) to allocate high memory for
> - * storing ACPI tables, we need to reserve them in e820 tables,
> - * otherwise kernel will reclaim them and data will be corrupted
> - */
> - entries[2].addr = ISA_END_ADDRESS;
> - entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
> - entries[2].type = E820_RAM;
> -
> - /* for simplicity, reserve entire malloc space */
> - entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
> - entries[3].size = TOTAL_MALLOC_LEN;
> - entries[3].type = E820_RESERVED;
> -
> - entries[4].addr = gd->relocaddr;
> - entries[4].size = gd->ram_size - gd->relocaddr;
> - entries[4].type = E820_RESERVED;
> -
> - entries[5].addr = CONFIG_PCIE_ECAM_BASE;
> - entries[5].size = CONFIG_PCIE_ECAM_SIZE;
> - entries[5].type = E820_RESERVED;
> -
> - return 6;
> -}
> -
> -/* This function loads and patches ACPI tables provided by QEMU */
> -u32 write_acpi_tables(u32 addr)
> -{
> - int i, ret = 0;
> - struct fw_file *file;
> - struct bios_linker_entry *table_loader;
> - struct bios_linker_entry *entry;
> - uint32_t size;
> - struct list_head *list;
> -
> - /* make sure fw_list is loaded */
> - ret = qemu_fwcfg_read_firmware_list();
> - if (ret) {
> - printf("error: can't read firmware file list\n");
> - return addr;
> - }
> -
> - file = qemu_fwcfg_find_file("etc/table-loader");
> - if (!file) {
> - printf("error: can't find etc/table-loader\n");
> - return addr;
> - }
> -
> - size = be32_to_cpu(file->cfg.size);
> - if ((size % sizeof(*entry)) != 0) {
> - printf("error: table-loader maybe corrupted\n");
> - return addr;
> - }
> -
> - table_loader = malloc(size);
> - if (!table_loader) {
> - printf("error: no memory for table-loader\n");
> - return addr;
> - }
> -
> - qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
> - size, table_loader);
> -
> - for (i = 0; i < (size / sizeof(*entry)); i++) {
> - entry = table_loader + i;
> - switch (le32_to_cpu(entry->command)) {
> - case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
> - ret = bios_linker_allocate(entry, &addr);
> - if (ret)
> - goto out;
> - break;
> - case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
> - ret = bios_linker_add_pointer(entry);
> - if (ret)
> - goto out;
> - break;
> - case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
> - ret = bios_linker_add_checksum(entry);
> - if (ret)
> - goto out;
> - break;
> - default:
> - break;
> - }
> - }
> -
> -out:
> - if (ret) {
> - list_for_each(list, &fw_list) {
> - file = list_entry(list, struct fw_file, list);
> - if (file->addr)
> - free((void *)file->addr);
> - }
> - }
> -
> - free(table_loader);
> - return addr;
> -}
> -#endif
> -
> -static int qemu_fwcfg_list_firmware(void)
> -{
> - int ret;
> - struct list_head *entry;
> - struct fw_file *file;
> -
> - /* make sure fw_list is loaded */
> - ret = qemu_fwcfg_read_firmware_list();
> - if (ret)
> - return ret;
> -
> - list_for_each(entry, &fw_list) {
> - file = list_entry(entry, struct fw_file, list);
> - printf("%-56s\n", file->cfg.name);
> - }
> -
> - return 0;
> -}
> -
> -void qemu_fwcfg_init(void)
> -{
> - fwcfg_present = qemu_fwcfg_present();
> - if (fwcfg_present)
> - fwcfg_dma_present = qemu_fwcfg_dma_present();
> -}
> -
> -static int qemu_fwcfg_do_list(cmd_tbl_t *cmdtp, int flag,
> - int argc, char * const argv[])
> -{
> - if (qemu_fwcfg_list_firmware() < 0)
> - return CMD_RET_FAILURE;
> -
> - return 0;
> -}
> -
> -static int qemu_fwcfg_do_cpus(cmd_tbl_t *cmdtp, int flag,
> - int argc, char * const argv[])
> -{
> - int ret = qemu_fwcfg_online_cpus();
> - if (ret < 0) {
> - printf("QEMU fw_cfg interface not found\n");
> - return CMD_RET_FAILURE;
> - }
> -
> - printf("%d cpu(s) online\n", qemu_fwcfg_online_cpus());
> -
> - return 0;
> -}
> -
> -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"
> -)
> diff --git a/arch/x86/cpu/qemu/qemu.c b/arch/x86/cpu/qemu/qemu.c
> index 7ad0ee4..b41e4ec 100644
> --- a/arch/x86/cpu/qemu/qemu.c
> +++ b/arch/x86/cpu/qemu/qemu.c
> @@ -6,12 +6,12 @@
>
> #include <common.h>
> #include <pci.h>
> +#include <qemu_fw_cfg.h>
> #include <asm/irq.h>
> #include <asm/post.h>
> #include <asm/processor.h>
> #include <asm/arch/device.h>
> #include <asm/arch/qemu.h>
> -#include <asm/fw_cfg.h>
>
> static bool i440fx;
>
> diff --git a/arch/x86/include/asm/fw_cfg.h b/arch/x86/include/asm/fw_cfg.h
> deleted file mode 100644
> index e9450c6..0000000
> --- a/arch/x86/include/asm/fw_cfg.h
> +++ /dev/null
> @@ -1,157 +0,0 @@
> -/*
> - * (C) Copyright 2015 Miao Yan <yanmiaobest at gmail.com>
> - *
> - * SPDX-License-Identifier: GPL-2.0+
> - */
> -
> -#ifndef __FW_CFG__
> -#define __FW_CFG__
> -
> -#define FW_CONTROL_PORT 0x510
> -#define FW_DATA_PORT 0x511
> -#define FW_DMA_PORT_LOW 0x514
> -#define FW_DMA_PORT_HIGH 0x518
> -
> -#include <linux/list.h>
> -
> -enum qemu_fwcfg_items {
> - FW_CFG_SIGNATURE = 0x00,
> - FW_CFG_ID = 0x01,
> - FW_CFG_UUID = 0x02,
> - FW_CFG_RAM_SIZE = 0x03,
> - FW_CFG_NOGRAPHIC = 0x04,
> - FW_CFG_NB_CPUS = 0x05,
> - FW_CFG_MACHINE_ID = 0x06,
> - FW_CFG_KERNEL_ADDR = 0x07,
> - FW_CFG_KERNEL_SIZE = 0x08,
> - FW_CFG_KERNEL_CMDLINE = 0x09,
> - FW_CFG_INITRD_ADDR = 0x0a,
> - FW_CFG_INITRD_SIZE = 0x0b,
> - FW_CFG_BOOT_DEVICE = 0x0c,
> - FW_CFG_NUMA = 0x0d,
> - FW_CFG_BOOT_MENU = 0x0e,
> - FW_CFG_MAX_CPUS = 0x0f,
> - FW_CFG_KERNEL_ENTRY = 0x10,
> - FW_CFG_KERNEL_DATA = 0x11,
> - FW_CFG_INITRD_DATA = 0x12,
> - FW_CFG_CMDLINE_ADDR = 0x13,
> - FW_CFG_CMDLINE_SIZE = 0x14,
> - FW_CFG_CMDLINE_DATA = 0x15,
> - FW_CFG_SETUP_ADDR = 0x16,
> - FW_CFG_SETUP_SIZE = 0x17,
> - FW_CFG_SETUP_DATA = 0x18,
> - FW_CFG_FILE_DIR = 0x19,
> - FW_CFG_FILE_FIRST = 0x20,
> - FW_CFG_WRITE_CHANNEL = 0x4000,
> - FW_CFG_ARCH_LOCAL = 0x8000,
> - FW_CFG_INVALID = 0xffff,
> -};
> -
> -enum {
> - BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
> - BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
> - BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
> -};
> -
> -enum {
> - BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
> - BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
> -};
> -
> -#define FW_CFG_FILE_SLOTS 0x10
> -#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
> -#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
> -
> -#define FW_CFG_MAX_FILE_PATH 56
> -#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
> -
> -#define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
> -
> -#define FW_CFG_DMA_ERROR (1 << 0)
> -#define FW_CFG_DMA_READ (1 << 1)
> -#define FW_CFG_DMA_SKIP (1 << 2)
> -#define FW_CFG_DMA_SELECT (1 << 3)
> -
> -#define FW_CFG_DMA_ENABLED (1 << 1)
> -
> -struct fw_cfg_file {
> - __be32 size;
> - __be16 select;
> - __be16 reserved;
> - char name[FW_CFG_MAX_FILE_PATH];
> -};
> -
> -struct fw_file {
> - struct fw_cfg_file cfg; /* firmware file information */
> - unsigned long addr; /* firmware file in-memory address */
> - struct list_head list; /* list node to link to fw_list */
> -};
> -
> -struct fw_cfg_dma_access {
> - __be32 control;
> - __be32 length;
> - __be64 address;
> -};
> -
> -struct bios_linker_entry {
> - __le32 command;
> - union {
> - /*
> - * COMMAND_ALLOCATE - allocate a table from @alloc.file
> - * subject to @alloc.align alignment (must be power of 2)
> - * and @alloc.zone (can be HIGH or FSEG) requirements.
> - *
> - * Must appear exactly once for each file, and before
> - * this file is referenced by any other command.
> - */
> - struct {
> - char file[BIOS_LINKER_LOADER_FILESZ];
> - __le32 align;
> - uint8_t zone;
> - } alloc;
> -
> - /*
> - * COMMAND_ADD_POINTER - patch the table (originating from
> - * @dest_file) at @pointer.offset, by adding a pointer to the
> - * table originating from @src_file. 1,2,4 or 8 byte unsigned
> - * addition is used depending on @pointer.size.
> - */
> - struct {
> - char dest_file[BIOS_LINKER_LOADER_FILESZ];
> - char src_file[BIOS_LINKER_LOADER_FILESZ];
> - __le32 offset;
> - uint8_t size;
> - } pointer;
> -
> - /*
> - * COMMAND_ADD_CHECKSUM - calculate checksum of the range
> - * specified by @cksum_start and @cksum_length fields,
> - * and then add the value at @cksum.offset.
> - * Checksum simply sums -X for each byte X in the range
> - * using 8-bit math.
> - */
> - struct {
> - char file[BIOS_LINKER_LOADER_FILESZ];
> - __le32 offset;
> - __le32 start;
> - __le32 length;
> - } cksum;
> -
> - /* padding */
> - char pad[124];
> - };
> -} __packed;
> -
> -/**
> - * Initialize QEMU fw_cfg interface
> - */
> -void qemu_fwcfg_init(void);
> -
> -/**
> - * Get system cpu number
> - *
> - * @return: cpu number in system
> - */
> -int qemu_fwcfg_online_cpus(void);
> -
> -#endif
> diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
> index 790f6fb..bb4139a 100644
> --- a/arch/x86/lib/acpi_table.c
> +++ b/arch/x86/lib/acpi_table.c
> @@ -333,7 +333,7 @@ static void acpi_create_ssdt_generator(acpi_header_t *ssdt,
>
> /*
> * QEMU's version of write_acpi_tables is defined in
> - * arch/x86/cpu/qemu/fw_cfg.c
> + * arch/x86/cpu/qemu/acpi_table.c
> */
> u32 write_acpi_tables(u32 start)
> {
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 9336752..c0fffe3 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -593,6 +593,13 @@ config CMD_SOUND
> sound init - set up sound system
> sound play - play a sound
>
> +config CMD_QEMU_FW_CFG
> + bool "qfw"
> + depends on X86
> + help
> + This provides access to the QEMU firmware interface. The main
> + feature is to allow easy loading of files passed to qemu-system
> + via -kernel / -initrd
> endmenu
This should really be "depends on QEMU". Sorry for my earlier comment.
Thanks,
Miao
>
> config CMD_BOOTSTAGE
> diff --git a/cmd/Makefile b/cmd/Makefile
> index f95759e..f99e67d 100644
> --- a/cmd/Makefile
> +++ b/cmd/Makefile
> @@ -105,6 +105,7 @@ endif
> obj-y += pcmcia.o
> obj-$(CONFIG_CMD_PORTIO) += portio.o
> obj-$(CONFIG_CMD_PXE) += pxe.o
> +obj-$(CONFIG_CMD_QEMU_FW_CFG) += qemu_fw_cfg.o
> obj-$(CONFIG_CMD_READ) += read.o
> obj-$(CONFIG_CMD_REGINFO) += reginfo.o
> obj-$(CONFIG_CMD_REISER) += reiser.o
> diff --git a/cmd/qemu_fw_cfg.c b/cmd/qemu_fw_cfg.c
> new file mode 100644
> index 0000000..48ae476
> --- /dev/null
> +++ b/cmd/qemu_fw_cfg.c
> @@ -0,0 +1,343 @@
> +/*
> + * (C) Copyright 2015 Miao Yan <yanmiaobest at gmail.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <errno.h>
> +#include <malloc.h>
> +#include <qemu_fw_cfg.h>
> +#include <asm/io.h>
> +#include <linux/list.h>
> +
> +static bool fwcfg_present;
> +static bool fwcfg_dma_present;
> +
> +static LIST_HEAD(fw_list);
> +
> +/* Read configuration item using fw_cfg PIO interface */
> +static void qemu_fwcfg_read_entry_pio(uint16_t entry,
> + uint32_t size, void *address)
> +{
> + uint32_t i = 0;
> + uint8_t *data = address;
> +
> + /*
> + * writting FW_CFG_INVALID will cause read operation to resume at
> + * last offset, otherwise read will start at offset 0
> + */
> + if (entry != FW_CFG_INVALID)
> + outw(entry, FW_CONTROL_PORT);
> + while (size--)
> + data[i++] = inb(FW_DATA_PORT);
> +}
> +
> +/* Read configuration item using fw_cfg DMA interface */
> +static void qemu_fwcfg_read_entry_dma(uint16_t entry,
> + uint32_t size, void *address)
> +{
> + struct fw_cfg_dma_access dma;
> +
> + dma.length = cpu_to_be32(size);
> + dma.address = cpu_to_be64((uintptr_t)address);
> + dma.control = cpu_to_be32(FW_CFG_DMA_READ);
> +
> + /*
> + * writting FW_CFG_INVALID will cause read operation to resume at
> + * last offset, otherwise read will start at offset 0
> + */
> + if (entry != FW_CFG_INVALID)
> + dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
> +
> + barrier();
> +
> + debug("qemu_fwcfg_dma_read_entry: addr %p, length %u control 0x%x\n",
> + address, size, be32_to_cpu(dma.control));
> +
> + outl(cpu_to_be32((uint32_t)&dma), FW_DMA_PORT_HIGH);
> +
> + while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_ERROR)
> + __asm__ __volatile__ ("pause");
> +}
> +
> +static bool qemu_fwcfg_present(void)
> +{
> + uint32_t qemu;
> +
> + qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
> + return be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE;
> +}
> +
> +static bool qemu_fwcfg_dma_present(void)
> +{
> + uint8_t dma_enabled;
> +
> + qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
> + if (dma_enabled & FW_CFG_DMA_ENABLED)
> + return true;
> +
> + return false;
> +}
> +
> +void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
> +{
> + if (fwcfg_dma_present)
> + qemu_fwcfg_read_entry_dma(entry, length, address);
> + else
> + qemu_fwcfg_read_entry_pio(entry, length, address);
> +}
> +
> +int qemu_fwcfg_online_cpus(void)
> +{
> + uint16_t nb_cpus;
> +
> + if (!fwcfg_present)
> + return -ENODEV;
> +
> + qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
> +
> + return le16_to_cpu(nb_cpus);
> +}
> +
> +/*
> + * This function prepares kernel for zboot. It loads kernel data
> + * to 'load_addr', initrd to 'initrd_addr' and kernel command
> + * line using qemu fw_cfg interface.
> + */
> +static int qemu_fwcfg_setup_kernel(void *load_addr, void *initrd_addr)
> +{
> + char *data_addr;
> + uint32_t setup_size, kernel_size, cmdline_size, initrd_size;
> +
> + qemu_fwcfg_read_entry(FW_CFG_SETUP_SIZE, 4, &setup_size);
> + qemu_fwcfg_read_entry(FW_CFG_KERNEL_SIZE, 4, &kernel_size);
> +
> + if (setup_size == 0 || kernel_size == 0) {
> + printf("warning: no kernel available\n");
> + return -1;
> + }
> +
> + data_addr = load_addr;
> + qemu_fwcfg_read_entry(FW_CFG_SETUP_DATA,
> + le32_to_cpu(setup_size), data_addr);
> + data_addr += le32_to_cpu(setup_size);
> +
> + qemu_fwcfg_read_entry(FW_CFG_KERNEL_DATA,
> + le32_to_cpu(kernel_size), data_addr);
> + data_addr += le32_to_cpu(kernel_size);
> +
> + data_addr = initrd_addr;
> + qemu_fwcfg_read_entry(FW_CFG_INITRD_SIZE, 4, &initrd_size);
> + if (initrd_size == 0) {
> + printf("warning: no initrd available\n");
> + } else {
> + qemu_fwcfg_read_entry(FW_CFG_INITRD_DATA,
> + le32_to_cpu(initrd_size), data_addr);
> + data_addr += le32_to_cpu(initrd_size);
> + }
> +
> + qemu_fwcfg_read_entry(FW_CFG_CMDLINE_SIZE, 4, &cmdline_size);
> + if (cmdline_size) {
> + qemu_fwcfg_read_entry(FW_CFG_CMDLINE_DATA,
> + le32_to_cpu(cmdline_size), data_addr);
> + /*
> + * if kernel cmdline only contains '\0', (e.g. no -append
> + * when invoking qemu), do not update bootargs
> + */
> + if (*data_addr != '\0') {
> + if (setenv("bootargs", data_addr) < 0)
> + printf("warning: unable to change bootargs\n");
> + }
> + }
> +
> + printf("loading kernel to address %p size %x", load_addr,
> + le32_to_cpu(kernel_size));
> + if (initrd_size)
> + printf(" initrd %p size %x\n",
> + initrd_addr,
> + le32_to_cpu(initrd_size));
> + else
> + printf("\n");
> +
> + return 0;
> +}
> +
> +int qemu_fwcfg_read_firmware_list(void)
> +{
> + int i;
> + uint32_t count;
> + struct fw_file *file;
> + struct list_head *entry;
> +
> + /* don't read it twice */
> + if (!list_empty(&fw_list))
> + return 0;
> +
> + qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
> + if (!count)
> + return 0;
> +
> + count = be32_to_cpu(count);
> + for (i = 0; i < count; i++) {
> + file = malloc(sizeof(*file));
> + if (!file) {
> + printf("error: allocating resource\n");
> + goto err;
> + }
> + qemu_fwcfg_read_entry(FW_CFG_INVALID,
> + sizeof(struct fw_cfg_file), &file->cfg);
> + file->addr = 0;
> + list_add_tail(&file->list, &fw_list);
> + }
> +
> + return 0;
> +
> +err:
> + list_for_each(entry, &fw_list) {
> + file = list_entry(entry, struct fw_file, list);
> + free(file);
> + }
> +
> + return -ENOMEM;
> +}
> +
> +struct fw_file *qemu_fwcfg_find_file(const char *name)
> +{
> + struct list_head *entry;
> + struct fw_file *file;
> +
> + list_for_each(entry, &fw_list) {
> + file = list_entry(entry, struct fw_file, list);
> + if (!strcmp(file->cfg.name, name))
> + return file;
> + }
> +
> + return NULL;
> +}
> +
> +void qemu_fwcfg_free_files(void)
> +{
> + struct fw_file *file;
> + struct list_head *list;
> +
> + list_for_each(list, &fw_list) {
> + file = list_entry(list, struct fw_file, list);
> + if (file->addr)
> + free((void *)file->addr);
> + }
> +}
> +
> +static int qemu_fwcfg_list_firmware(void)
> +{
> + int ret;
> + struct list_head *entry;
> + struct fw_file *file;
> +
> + /* make sure fw_list is loaded */
> + ret = qemu_fwcfg_read_firmware_list();
> + if (ret)
> + return ret;
> +
> + list_for_each(entry, &fw_list) {
> + file = list_entry(entry, struct fw_file, list);
> + printf("%-56s\n", file->cfg.name);
> + }
> +
> + return 0;
> +}
> +
> +void qemu_fwcfg_init(void)
> +{
> + fwcfg_present = qemu_fwcfg_present();
> + if (fwcfg_present)
> + fwcfg_dma_present = qemu_fwcfg_dma_present();
> +}
> +
> +static int qemu_fwcfg_do_list(cmd_tbl_t *cmdtp, int flag,
> + int argc, char * const argv[])
> +{
> + if (qemu_fwcfg_list_firmware() < 0)
> + return CMD_RET_FAILURE;
> +
> + return 0;
> +}
> +
> +static int qemu_fwcfg_do_cpus(cmd_tbl_t *cmdtp, int flag,
> + int argc, char * const argv[])
> +{
> + int ret = qemu_fwcfg_online_cpus();
> + if (ret < 0) {
> + printf("QEMU fw_cfg interface not found\n");
> + return CMD_RET_FAILURE;
> + }
> +
> + printf("%d cpu(s) online\n", qemu_fwcfg_online_cpus());
> +
> + return 0;
> +}
> +
> +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"
> +)
> diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig
> index 53b1ff6..a813e5b 100644
> --- a/configs/qemu-x86_defconfig
> +++ b/configs/qemu-x86_defconfig
> @@ -20,6 +20,7 @@ CONFIG_CMD_DHCP=y
> # CONFIG_CMD_NFS is not set
> CONFIG_CMD_PING=y
> CONFIG_CMD_TIME=y
> +CONFIG_CMD_QEMU_FW_CFG=y
> CONFIG_CMD_BOOTSTAGE=y
> CONFIG_CMD_EXT2=y
> CONFIG_CMD_EXT4=y
> diff --git a/include/qemu_fw_cfg.h b/include/qemu_fw_cfg.h
> new file mode 100644
> index 0000000..e21f150
> --- /dev/null
> +++ b/include/qemu_fw_cfg.h
> @@ -0,0 +1,162 @@
> +/*
> + * (C) Copyright 2015 Miao Yan <yanmiaobest at gmail.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#ifndef __FW_CFG__
> +#define __FW_CFG__
> +
> +#define FW_CONTROL_PORT 0x510
> +#define FW_DATA_PORT 0x511
> +#define FW_DMA_PORT_LOW 0x514
> +#define FW_DMA_PORT_HIGH 0x518
> +
> +#include <linux/list.h>
> +
> +enum qemu_fwcfg_items {
> + FW_CFG_SIGNATURE = 0x00,
> + FW_CFG_ID = 0x01,
> + FW_CFG_UUID = 0x02,
> + FW_CFG_RAM_SIZE = 0x03,
> + FW_CFG_NOGRAPHIC = 0x04,
> + FW_CFG_NB_CPUS = 0x05,
> + FW_CFG_MACHINE_ID = 0x06,
> + FW_CFG_KERNEL_ADDR = 0x07,
> + FW_CFG_KERNEL_SIZE = 0x08,
> + FW_CFG_KERNEL_CMDLINE = 0x09,
> + FW_CFG_INITRD_ADDR = 0x0a,
> + FW_CFG_INITRD_SIZE = 0x0b,
> + FW_CFG_BOOT_DEVICE = 0x0c,
> + FW_CFG_NUMA = 0x0d,
> + FW_CFG_BOOT_MENU = 0x0e,
> + FW_CFG_MAX_CPUS = 0x0f,
> + FW_CFG_KERNEL_ENTRY = 0x10,
> + FW_CFG_KERNEL_DATA = 0x11,
> + FW_CFG_INITRD_DATA = 0x12,
> + FW_CFG_CMDLINE_ADDR = 0x13,
> + FW_CFG_CMDLINE_SIZE = 0x14,
> + FW_CFG_CMDLINE_DATA = 0x15,
> + FW_CFG_SETUP_ADDR = 0x16,
> + FW_CFG_SETUP_SIZE = 0x17,
> + FW_CFG_SETUP_DATA = 0x18,
> + FW_CFG_FILE_DIR = 0x19,
> + FW_CFG_FILE_FIRST = 0x20,
> + FW_CFG_WRITE_CHANNEL = 0x4000,
> + FW_CFG_ARCH_LOCAL = 0x8000,
> + FW_CFG_INVALID = 0xffff,
> +};
> +
> +enum {
> + BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
> + BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
> + BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
> +};
> +
> +enum {
> + BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
> + BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
> +};
> +
> +#define FW_CFG_FILE_SLOTS 0x10
> +#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
> +#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
> +
> +#define FW_CFG_MAX_FILE_PATH 56
> +#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
> +
> +#define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
> +
> +#define FW_CFG_DMA_ERROR (1 << 0)
> +#define FW_CFG_DMA_READ (1 << 1)
> +#define FW_CFG_DMA_SKIP (1 << 2)
> +#define FW_CFG_DMA_SELECT (1 << 3)
> +
> +#define FW_CFG_DMA_ENABLED (1 << 1)
> +
> +struct fw_cfg_file {
> + __be32 size;
> + __be16 select;
> + __be16 reserved;
> + char name[FW_CFG_MAX_FILE_PATH];
> +};
> +
> +struct fw_file {
> + struct fw_cfg_file cfg; /* firmware file information */
> + unsigned long addr; /* firmware file in-memory address */
> + struct list_head list; /* list node to link to fw_list */
> +};
> +
> +struct fw_cfg_dma_access {
> + __be32 control;
> + __be32 length;
> + __be64 address;
> +};
> +
> +struct bios_linker_entry {
> + __le32 command;
> + union {
> + /*
> + * COMMAND_ALLOCATE - allocate a table from @alloc.file
> + * subject to @alloc.align alignment (must be power of 2)
> + * and @alloc.zone (can be HIGH or FSEG) requirements.
> + *
> + * Must appear exactly once for each file, and before
> + * this file is referenced by any other command.
> + */
> + struct {
> + char file[BIOS_LINKER_LOADER_FILESZ];
> + __le32 align;
> + uint8_t zone;
> + } alloc;
> +
> + /*
> + * COMMAND_ADD_POINTER - patch the table (originating from
> + * @dest_file) at @pointer.offset, by adding a pointer to the
> + * table originating from @src_file. 1,2,4 or 8 byte unsigned
> + * addition is used depending on @pointer.size.
> + */
> + struct {
> + char dest_file[BIOS_LINKER_LOADER_FILESZ];
> + char src_file[BIOS_LINKER_LOADER_FILESZ];
> + __le32 offset;
> + uint8_t size;
> + } pointer;
> +
> + /*
> + * COMMAND_ADD_CHECKSUM - calculate checksum of the range
> + * specified by @cksum_start and @cksum_length fields,
> + * and then add the value at @cksum.offset.
> + * Checksum simply sums -X for each byte X in the range
> + * using 8-bit math.
> + */
> + struct {
> + char file[BIOS_LINKER_LOADER_FILESZ];
> + __le32 offset;
> + __le32 start;
> + __le32 length;
> + } cksum;
> +
> + /* padding */
> + char pad[124];
> + };
> +} __packed;
> +
> +/**
> + * Initialize QEMU fw_cfg interface
> + */
> +void qemu_fwcfg_init(void);
> +
> +void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
> +int qemu_fwcfg_read_firmware_list(void);
> +struct fw_file *qemu_fwcfg_find_file(const char *name);
> +void qemu_fwcfg_free_files(void);
> +
> +/**
> + * Get system cpu number
> + *
> + * @return: cpu number in system
> + */
> +int qemu_fwcfg_online_cpus(void);
> +
> +#endif
> --
> 1.9.1
>
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