diff options
Diffstat (limited to 'hw/loongarch/boot.c')
-rw-r--r-- | hw/loongarch/boot.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/hw/loongarch/boot.c b/hw/loongarch/boot.c new file mode 100644 index 0000000..9feed17 --- /dev/null +++ b/hw/loongarch/boot.c @@ -0,0 +1,128 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * LoongArch boot helper functions. + * + * Copyright (c) 2023 Loongson Technology Corporation Limited + */ + +#include "qemu/osdep.h" +#include "qemu/units.h" +#include "target/loongarch/cpu.h" +#include "hw/loongarch/virt.h" +#include "hw/loader.h" +#include "elf.h" +#include "qemu/error-report.h" +#include "sysemu/reset.h" +#include "sysemu/qtest.h" + +static uint64_t cpu_loongarch_virt_to_phys(void *opaque, uint64_t addr) +{ + return addr & MAKE_64BIT_MASK(0, TARGET_PHYS_ADDR_SPACE_BITS); +} + +static int64_t load_kernel_info(struct loongarch_boot_info *info) +{ + uint64_t kernel_entry, kernel_low, kernel_high; + ssize_t kernel_size; + + kernel_size = load_elf(info->kernel_filename, NULL, + cpu_loongarch_virt_to_phys, NULL, + &kernel_entry, &kernel_low, + &kernel_high, NULL, 0, + EM_LOONGARCH, 1, 0); + + if (kernel_size < 0) { + error_report("could not load kernel '%s': %s", + info->kernel_filename, + load_elf_strerror(kernel_size)); + exit(1); + } + return kernel_entry; +} + +static void reset_load_elf(void *opaque) +{ + LoongArchCPU *cpu = opaque; + CPULoongArchState *env = &cpu->env; + + cpu_reset(CPU(cpu)); + if (env->load_elf) { + cpu_set_pc(CPU(cpu), env->elf_address); + } +} + +static void fw_cfg_add_kernel_info(struct loongarch_boot_info *info, + FWCfgState *fw_cfg) +{ + /* + * 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, + false); + + if (info->initrd_filename) { + 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); + } +} + +static void loongarch_firmware_boot(LoongArchMachineState *lams, + struct loongarch_boot_info *info) +{ + fw_cfg_add_kernel_info(info, lams->fw_cfg); +} + +static void loongarch_direct_kernel_boot(struct loongarch_boot_info *info) +{ + int64_t kernel_addr = 0; + LoongArchCPU *lacpu; + CPUState *cs; + + if (info->kernel_filename) { + kernel_addr = load_kernel_info(info); + } else { + if(!qtest_enabled()) { + error_report("Need kernel filename\n"); + exit(1); + } + } + + CPU_FOREACH(cs) { + lacpu = LOONGARCH_CPU(cs); + lacpu->env.load_elf = true; + lacpu->env.elf_address = kernel_addr; + } +} + +void loongarch_load_kernel(MachineState *ms, struct loongarch_boot_info *info) +{ + LoongArchMachineState *lams = LOONGARCH_MACHINE(ms); + int i; + + /* register reset function */ + for (i = 0; i < ms->smp.cpus; i++) { + qemu_register_reset(reset_load_elf, LOONGARCH_CPU(qemu_get_cpu(i))); + } + + info->kernel_filename = ms->kernel_filename; + info->kernel_cmdline = ms->kernel_cmdline; + info->initrd_filename = ms->initrd_filename; + + if (lams->bios_loaded) { + loongarch_firmware_boot(lams, info); + } else { + loongarch_direct_kernel_boot(info); + } +} |