#include "elf.h"
#include "sysemu/device_tree.h"
#include "qemu/config-file.h"
+#include "exec/address-spaces.h"
/* Kernel boot protocol is specified in the kernel docs
* Documentation/arm/Booting and Documentation/arm64/booting.txt
{
CPUARMState *env = &cpu->env;
- stl_phys_notdirty(info->smp_bootreg_addr, 0);
+ stl_phys_notdirty(&address_space_memory, info->smp_bootreg_addr, 0);
env->regs[15] = info->smp_loader_start;
}
}
#define WRITE_WORD(p, value) do { \
- stl_phys_notdirty(p, value); \
+ stl_phys_notdirty(&address_space_memory, p, value); \
p += 4; \
} while (0)
}
}
-static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo)
+/**
+ * load_dtb() - load a device tree binary image into memory
+ * @addr: the address to load the image at
+ * @binfo: struct describing the boot environment
+ * @addr_limit: upper limit of the available memory area at @addr
+ *
+ * Load a device tree supplied by the machine or by the user with the
+ * '-dtb' command line option, and put it at offset @addr in target
+ * memory.
+ *
+ * If @addr_limit contains a meaningful value (i.e., it is strictly greater
+ * than @addr), the device tree is only loaded if its size does not exceed
+ * the limit.
+ *
+ * Returns: the size of the device tree image on success,
+ * 0 if the image size exceeds the limit,
+ * -1 on errors.
+ *
+ * Note: Must not be called unless have_dtb(binfo) is true.
+ */
+static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
+ hwaddr addr_limit)
{
void *fdt = NULL;
int size, rc;
goto fail;
}
g_free(filename);
- } else if (binfo->get_dtb) {
+ } else {
fdt = binfo->get_dtb(binfo, &size);
if (!fdt) {
fprintf(stderr, "Board was unable to create a dtb blob\n");
}
}
+ if (addr_limit > addr && size > (addr_limit - addr)) {
+ /* Installing the device tree blob at addr would exceed addr_limit.
+ * Whether this constitutes failure is up to the caller to decide,
+ * so just return 0 as size, i.e., no error.
+ */
+ g_free(fdt);
+ return 0;
+ }
+
acells = qemu_fdt_getprop_cell(fdt, "/", "#address-cells");
scells = qemu_fdt_getprop_cell(fdt, "/", "#size-cells");
if (acells == 0 || scells == 0) {
qemu_fdt_dumpdtb(fdt, size);
- cpu_physical_memory_write(addr, fdt, size);
+ /* Put the DTB into the memory map as a ROM image: this will ensure
+ * the DTB is copied again upon reset, even if addr points into RAM.
+ */
+ rom_add_blob_fixed("dtb", fdt, size, addr);
g_free(fdt);
- return 0;
+ return size;
fail:
g_free(fdt);
if (info) {
if (!info->is_linux) {
/* Jump to the entry point. */
- env->regs[15] = info->entry & 0xfffffffe;
- env->thumb = info->entry & 1;
+ if (env->aarch64) {
+ env->pc = info->entry;
+ } else {
+ env->regs[15] = info->entry & 0xfffffffe;
+ env->thumb = info->entry & 1;
+ }
} else {
+ /* If we are booting Linux then we need to check whether we are
+ * booting into secure or non-secure state and adjust the state
+ * accordingly. Out of reset, ARM is defined to be in secure state
+ * (SCR.NS = 0), we change that here if non-secure boot has been
+ * requested.
+ */
+ if (arm_feature(env, ARM_FEATURE_EL3)) {
+ /* AArch64 is defined to come out of reset into EL3 if enabled.
+ * If we are booting Linux then we need to adjust our EL as
+ * Linux expects us to be in EL2 or EL1. AArch32 resets into
+ * SVC, which Linux expects, so no privilege/exception level to
+ * adjust.
+ */
+ if (env->aarch64) {
+ if (arm_feature(env, ARM_FEATURE_EL2)) {
+ env->pstate = PSTATE_MODE_EL2h;
+ } else {
+ env->pstate = PSTATE_MODE_EL1h;
+ }
+ }
+
+ /* Set to non-secure if not a secure boot */
+ if (!info->secure_boot) {
+ /* Linux expects non-secure state */
+ env->cp15.scr_el3 |= SCR_NS;
+ }
+ }
+
if (CPU(cpu) == first_cpu) {
if (env->aarch64) {
env->pc = info->loader_start;
}
}
+/**
+ * load_image_to_fw_cfg() - Load an image file into an fw_cfg entry identified
+ * by key.
+ * @fw_cfg: The firmware config instance to store the data in.
+ * @size_key: The firmware config key to store the size of the loaded
+ * data under, with fw_cfg_add_i32().
+ * @data_key: The firmware config key to store the loaded data under,
+ * with fw_cfg_add_bytes().
+ * @image_name: The name of the image file to load. If it is NULL, the
+ * function returns without doing anything.
+ * @try_decompress: Whether the image should be decompressed (gunzipped) before
+ * adding it to fw_cfg. If decompression fails, the image is
+ * loaded as-is.
+ *
+ * In case of failure, the function prints an error message to stderr and the
+ * process exits with status 1.
+ */
+static void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_t size_key,
+ uint16_t data_key, const char *image_name,
+ bool try_decompress)
+{
+ size_t size = -1;
+ uint8_t *data;
+
+ if (image_name == NULL) {
+ return;
+ }
+
+ if (try_decompress) {
+ size = load_image_gzipped_buffer(image_name,
+ LOAD_IMAGE_MAX_GUNZIP_BYTES, &data);
+ }
+
+ if (size == (size_t)-1) {
+ gchar *contents;
+ gsize length;
+
+ if (!g_file_get_contents(image_name, &contents, &length, NULL)) {
+ fprintf(stderr, "failed to load \"%s\"\n", image_name);
+ exit(1);
+ }
+ size = length;
+ data = (uint8_t *)contents;
+ }
+
+ fw_cfg_add_i32(fw_cfg, size_key, size);
+ fw_cfg_add_bytes(fw_cfg, data_key, data, size);
+}
+
void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
{
- CPUState *cs = CPU(cpu);
+ CPUState *cs;
int kernel_size;
int initrd_size;
int is_linux = 0;
- uint64_t elf_entry;
+ uint64_t elf_entry, elf_low_addr, elf_high_addr;
+ int elf_machine;
hwaddr entry, kernel_load_offset;
int big_endian;
static const ARMInsnFixup *primary_loader;
+ /* CPU objects (unlike devices) are not automatically reset on system
+ * reset, so we must always register a handler to do so. If we're
+ * actually loading a kernel, the handler is also responsible for
+ * arranging that we start it correctly.
+ */
+ for (cs = CPU(cpu); cs; cs = CPU_NEXT(cs)) {
+ qemu_register_reset(do_cpu_reset, ARM_CPU(cs));
+ }
+
/* Load the kernel. */
- if (!info->kernel_filename) {
- /* If no kernel specified, do nothing; we will start from address 0
- * (typically a boot ROM image) in the same way as hardware.
+ if (!info->kernel_filename || info->firmware_loaded) {
+
+ if (have_dtb(info)) {
+ /* If we have a device tree blob, but no kernel to supply it to (or
+ * the kernel is supposed to be loaded by the bootloader), copy the
+ * DTB to the base of RAM for the bootloader to pick up.
+ */
+ if (load_dtb(info->loader_start, info, 0) < 0) {
+ exit(1);
+ }
+ }
+
+ if (info->kernel_filename) {
+ FWCfgState *fw_cfg;
+ bool try_decompressing_kernel;
+
+ fw_cfg = fw_cfg_find();
+ try_decompressing_kernel = arm_feature(&cpu->env,
+ ARM_FEATURE_AARCH64);
+
+ /* Expose the kernel, the command line, and the initrd in fw_cfg.
+ * We don't process them here at all, it's all left to the
+ * firmware.
+ */
+ load_image_to_fw_cfg(fw_cfg,
+ FW_CFG_KERNEL_SIZE, FW_CFG_KERNEL_DATA,
+ info->kernel_filename,
+ try_decompressing_kernel);
+ load_image_to_fw_cfg(fw_cfg,
+ FW_CFG_INITRD_SIZE, FW_CFG_INITRD_DATA,
+ info->initrd_filename, false);
+
+ if (info->kernel_cmdline) {
+ fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE,
+ strlen(info->kernel_cmdline) + 1);
+ fw_cfg_add_string(fw_cfg, FW_CFG_CMDLINE_DATA,
+ info->kernel_cmdline);
+ }
+ }
+
+ /* We will start from address 0 (typically a boot ROM image) in the
+ * same way as hardware.
*/
return;
}
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
primary_loader = bootloader_aarch64;
kernel_load_offset = KERNEL64_LOAD_ADDR;
+ elf_machine = EM_AARCH64;
} else {
primary_loader = bootloader;
kernel_load_offset = KERNEL_LOAD_ADDR;
+ elf_machine = EM_ARM;
}
info->dtb_filename = qemu_opt_get(qemu_get_machine_opts(), "dtb");
/* Assume that raw images are linux kernels, and ELF images are not. */
kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
- NULL, NULL, big_endian, ELF_MACHINE, 1);
+ &elf_low_addr, &elf_high_addr, big_endian,
+ elf_machine, 1);
+ if (kernel_size > 0 && have_dtb(info)) {
+ /* If there is still some room left at the base of RAM, try and put
+ * the DTB there like we do for images loaded with -bios or -pflash.
+ */
+ if (elf_low_addr > info->loader_start
+ || elf_high_addr < info->loader_start) {
+ /* Pass elf_low_addr as address limit to load_dtb if it may be
+ * pointing into RAM, otherwise pass '0' (no limit)
+ */
+ if (elf_low_addr < info->loader_start) {
+ elf_low_addr = 0;
+ }
+ if (load_dtb(info->loader_start, info, elf_low_addr) < 0) {
+ exit(1);
+ }
+ }
+ }
entry = elf_entry;
if (kernel_size < 0) {
kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
- &is_linux);
+ &is_linux, NULL, NULL);
+ }
+ /* On aarch64, it's the bootloader's job to uncompress the kernel. */
+ if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) && kernel_size < 0) {
+ entry = info->loader_start + kernel_load_offset;
+ kernel_size = load_image_gzipped(info->kernel_filename, entry,
+ info->ram_size - kernel_load_offset);
+ is_linux = 1;
}
if (kernel_size < 0) {
entry = info->loader_start + kernel_load_offset;
*/
hwaddr dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size,
4096);
- if (load_dtb(dtb_start, info)) {
+ if (load_dtb(dtb_start, info, 0) < 0) {
exit(1);
}
fixupcontext[FIXUP_ARGPTR] = dtb_start;
}
info->is_linux = is_linux;
- for (; cs; cs = CPU_NEXT(cs)) {
- cpu = ARM_CPU(cs);
- cpu->env.boot_info = info;
- qemu_register_reset(do_cpu_reset, cpu);
+ for (cs = CPU(cpu); cs; cs = CPU_NEXT(cs)) {
+ ARM_CPU(cs)->env.boot_info = info;
}
}
projects / qemu.git / blobdiff