Add init_cmline and set boot_info->a0, a1

Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20231227080821.3216113-5-gaosong@loongson.cn>
---
 include/hw/loongarch/virt.h |  2 ++
 target/loongarch/cpu.h      |  2 ++
 hw/loongarch/boot.c         | 19 +++++++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index 6e6a5e487a..94ff15ad66 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -31,6 +31,8 @@
 #define VIRT_GED_MEM_ADDR       (VIRT_GED_EVT_ADDR + ACPI_GED_EVT_SEL_LEN)
 #define VIRT_GED_REG_ADDR       (VIRT_GED_MEM_ADDR + MEMORY_HOTPLUG_IO_LEN)
 
+#define COMMAND_LINE_SIZE       512
+
 struct LoongArchMachineState {
     /*< private >*/
     MachineState parent_obj;
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 0fa5e0ca93..69953b8a2a 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -361,6 +361,8 @@ typedef struct CPUArchState {
     uint32_t mp_state;
     /* Store ipistate to access from this struct */
     DeviceState *ipistate;
+
+    struct loongarch_boot_info *boot_info;
 #endif
 } CPULoongArchState;
 
diff --git a/hw/loongarch/boot.c b/hw/loongarch/boot.c
index 2f398260af..897d4636b6 100644
--- a/hw/loongarch/boot.c
+++ b/hw/loongarch/boot.c
@@ -62,6 +62,16 @@ static const unsigned int slave_boot_code[] = {
     0x4c000020,   /* jirl       $r0,$r1,0           */
 };
 
+static void init_cmdline(struct loongarch_boot_info *info, void *p, void *start)
+{
+    hwaddr cmdline_addr = (hwaddr)p - (hwaddr)start;
+
+    info->a0 = 1;
+    info->a1 = cmdline_addr;
+
+    memcpy(p, info->kernel_cmdline, COMMAND_LINE_SIZE);
+}
+
 static uint64_t cpu_loongarch_virt_to_phys(void *opaque, uint64_t addr)
 {
     return addr & MAKE_64BIT_MASK(0, TARGET_PHYS_ADDR_SPACE_BITS);
@@ -121,6 +131,10 @@ static void reset_load_elf(void *opaque)
 
     cpu_reset(CPU(cpu));
     if (env->load_elf) {
+	if (cpu == LOONGARCH_CPU(first_cpu)) {
+            env->gpr[4] = env->boot_info->a0;
+            env->gpr[5] = env->boot_info->a1;
+        }
         cpu_set_pc(CPU(cpu), env->elf_address);
     }
 }
@@ -160,8 +174,13 @@ static void loongarch_firmware_boot(LoongArchMachineState *lams,
 
 static void init_boot_rom(struct loongarch_boot_info *info, void *p)
 {
+    void *start = p;
+
     memcpy(p, &slave_boot_code, sizeof(slave_boot_code));
     p += sizeof(slave_boot_code);
+
+    init_cmdline(info, p, start);
+    p += COMMAND_LINE_SIZE;
 }
 
 static void loongarch_direct_kernel_boot(struct loongarch_boot_info *info)
-- 
2.25.1