| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| #include <linux/init.h> |
| #include <linux/threads.h> |
| |
| #include <asm/addrspace.h> |
| #include <asm/asm.h> |
| #include <asm/asmmacro.h> |
| #include <asm/regdef.h> |
| #include <asm/loongarch.h> |
| #include <asm/stackframe.h> |
| |
| __REF |
| |
| SYM_CODE_START(kernel_entry) # kernel entry point |
| |
| /* Config direct window and set PG */ |
| li.d t0, CSR_DMW0_INIT # UC, PLV0, 0x8000 xxxx xxxx xxxx |
| csrwr t0, LOONGARCH_CSR_DMWIN0 |
| li.d t0, CSR_DMW1_INIT # CA, PLV0, 0x9000 xxxx xxxx xxxx |
| csrwr t0, LOONGARCH_CSR_DMWIN1 |
| /* Enable PG */ |
| li.w t0, 0xb0 # PLV=0, IE=0, PG=1 |
| csrwr t0, LOONGARCH_CSR_CRMD |
| li.w t0, 0x04 # PLV=0, PIE=1, PWE=0 |
| csrwr t0, LOONGARCH_CSR_PRMD |
| li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0 |
| csrwr t0, LOONGARCH_CSR_EUEN |
| |
| /* We might not get launched at the address the kernel is linked to, |
| so we jump there. */ |
| la.abs t0, 0f |
| jr t0 |
| 0: |
| la t0, __bss_start # clear .bss |
| st.d zero, t0, 0 |
| la t1, __bss_stop - LONGSIZE |
| 1: |
| addi.d t0, t0, LONGSIZE |
| st.d zero, t0, 0 |
| bne t0, t1, 1b |
| |
| la t0, fw_arg0 |
| st.d a0, t0, 0 # firmware arguments |
| la t0, fw_arg1 |
| st.d a1, t0, 0 |
| |
| /* KSave3 used for percpu base, initialized as 0 */ |
| csrwr zero, PERCPU_BASE_KS |
| /* GPR21 used for percpu base (runtime), initialized as 0 */ |
| move u0, zero |
| |
| la tp, init_thread_union |
| /* Set the SP after an empty pt_regs. */ |
| PTR_LI sp, (_THREAD_SIZE - 32 - PT_SIZE) |
| PTR_ADD sp, sp, tp |
| set_saved_sp sp, t0, t1 |
| PTR_ADDI sp, sp, -4 * SZREG # init stack pointer |
| |
| bl start_kernel |
| |
| SYM_CODE_END(kernel_entry) |
| |
| #ifdef CONFIG_SMP |
| |
| /* |
| * SMP slave cpus entry point. Board specific code for bootstrap calls this |
| * function after setting up the stack and tp registers. |
| */ |
| SYM_CODE_START(smpboot_entry) |
| li.d t0, CSR_DMW0_INIT # UC, PLV0 |
| csrwr t0, LOONGARCH_CSR_DMWIN0 |
| li.d t0, CSR_DMW1_INIT # CA, PLV0 |
| csrwr t0, LOONGARCH_CSR_DMWIN1 |
| li.w t0, 0xb0 # PLV=0, IE=0, PG=1 |
| csrwr t0, LOONGARCH_CSR_CRMD |
| li.w t0, 0x04 # PLV=0, PIE=1, PWE=0 |
| csrwr t0, LOONGARCH_CSR_PRMD |
| li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0 |
| csrwr t0, LOONGARCH_CSR_EUEN |
| |
| la.abs t0, cpuboot_data |
| ld.d sp, t0, CPU_BOOT_STACK |
| ld.d tp, t0, CPU_BOOT_TINFO |
| |
| la.abs t0, 0f |
| jr t0 |
| 0: |
| bl start_secondary |
| SYM_CODE_END(smpboot_entry) |
| |
| #endif /* CONFIG_SMP */ |
| |
| SYM_ENTRY(kernel_entry_end, SYM_L_GLOBAL, SYM_A_NONE) |
