hw/loongarch/fw_cfg.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * QEMU fw_cfg helpers (LoongArch specific)
   4  *
   5  * Copyright (C) 2021 Loongson Technology Corporation Limited
   6  */
   7
   8 #include "qemu/osdep.h"
   9 #include "hw/loongarch/fw_cfg.h"
  10 #include "hw/loongarch/virt.h"
  11 #include "hw/nvram/fw_cfg.h"
  12 #include "sysemu/sysemu.h"
  13
  14 static void fw_cfg_boot_set(void *opaque, const char *boot_device,
  15                             Error **errp)
  16 {
  17     fw_cfg_modify_i16(opaque, FW_CFG_BOOT_DEVICE, boot_device[0]);
  18 }
  19
  20 FWCfgState *loongarch_fw_cfg_init(ram_addr_t ram_size, MachineState *ms)
  21 {
  22     FWCfgState *fw_cfg;
  23     int max_cpus = ms->smp.max_cpus;
  24     int smp_cpus = ms->smp.cpus;
  25
  26     fw_cfg = fw_cfg_init_mem_wide(VIRT_FWCFG_BASE + 8, VIRT_FWCFG_BASE, 8, 0, NULL);
  27     fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
  28     fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
  29     fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
  30
  31     qemu_register_boot_set(fw_cfg_boot_set, fw_cfg);
  32     return fw_cfg;
  33 }