| /* |
| * SPDX-License-Identifier: BSD-2-Clause |
| * |
| * Copyright (c) 2019 Western Digital Corporation or its affiliates. |
| * |
| * Authors: |
| * Anup Patel <anup.patel@wdc.com> |
| */ |
| |
| #include <sbi/riscv_asm.h> |
| #include <sbi/riscv_encoding.h> |
| #include <sbi/riscv_elf.h> |
| #include <sbi/sbi_platform.h> |
| #include <sbi/sbi_scratch.h> |
| #include <sbi/sbi_trap.h> |
| |
| #define BOOT_STATUS_RELOCATE_DONE 1 |
| #define BOOT_STATUS_BOOT_HART_DONE 2 |
| |
| .macro MOV_3R __d0, __s0, __d1, __s1, __d2, __s2 |
| add \__d0, \__s0, zero |
| add \__d1, \__s1, zero |
| add \__d2, \__s2, zero |
| .endm |
| |
| .macro MOV_5R __d0, __s0, __d1, __s1, __d2, __s2, __d3, __s3, __d4, __s4 |
| add \__d0, \__s0, zero |
| add \__d1, \__s1, zero |
| add \__d2, \__s2, zero |
| add \__d3, \__s3, zero |
| add \__d4, \__s4, zero |
| .endm |
| |
| /* |
| * If __start_reg <= __check_reg and __check_reg < __end_reg then |
| * jump to __pass |
| */ |
| .macro BRANGE __start_reg, __end_reg, __check_reg, __jump_lable |
| blt \__check_reg, \__start_reg, 999f |
| bge \__check_reg, \__end_reg, 999f |
| j \__jump_lable |
| 999: |
| .endm |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _start |
| .globl _start_warm |
| _start: |
| /* Find preferred boot HART id */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| call fw_boot_hart |
| add a6, a0, zero |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| li a7, -1 |
| beq a6, a7, _try_lottery |
| /* Jump to relocation wait loop if we are not boot hart */ |
| bne a0, a6, _wait_relocate_copy_done |
| _try_lottery: |
| /* Jump to relocation wait loop if we don't get relocation lottery */ |
| lla a6, _relocate_lottery |
| li a7, 1 |
| amoadd.w a6, a7, (a6) |
| bnez a6, _wait_relocate_copy_done |
| |
| /* Save load address */ |
| lla t0, _load_start |
| lla t1, _fw_start |
| REG_S t1, 0(t0) |
| |
| #ifdef FW_PIC |
| /* relocate the global table content */ |
| lla t0, _link_start |
| REG_L t0, 0(t0) |
| /* t1 shall has the address of _fw_start */ |
| sub t2, t1, t0 |
| lla t3, _runtime_offset |
| REG_S t2, (t3) |
| lla t0, __rel_dyn_start |
| lla t1, __rel_dyn_end |
| beq t0, t1, _relocate_done |
| 2: |
| REG_L t5, REGBYTES(t0) /* t5 <-- relocation info:type */ |
| li t3, R_RISCV_RELATIVE /* reloc type R_RISCV_RELATIVE */ |
| bne t5, t3, 3f |
| REG_L t3, 0(t0) |
| REG_L t5, (REGBYTES * 2)(t0) /* t5 <-- addend */ |
| add t5, t5, t2 |
| add t3, t3, t2 |
| REG_S t5, 0(t3) /* store runtime address to the GOT entry */ |
| |
| 3: |
| addi t0, t0, (REGBYTES * 3) |
| blt t0, t1, 2b |
| j _relocate_done |
| _wait_relocate_copy_done: |
| j _wait_for_boot_hart |
| #else |
| /* Relocate if load address != link address */ |
| _relocate: |
| lla t0, _link_start |
| REG_L t0, 0(t0) |
| lla t1, _link_end |
| REG_L t1, 0(t1) |
| lla t2, _load_start |
| REG_L t2, 0(t2) |
| beq t0, t2, _relocate_done |
| sub t3, t1, t0 |
| add t3, t3, t2 |
| lla t4, _relocate_done |
| sub t4, t4, t2 |
| add t4, t4, t0 |
| blt t2, t0, _relocate_copy_to_upper |
| _relocate_copy_to_lower: |
| ble t1, t2, _relocate_copy_to_lower_loop |
| lla t3, _relocate_lottery |
| BRANGE t2, t1, t3, _start_hang |
| lla t3, _boot_status |
| BRANGE t2, t1, t3, _start_hang |
| lla t3, _relocate |
| lla t5, _relocate_done |
| BRANGE t2, t1, t3, _start_hang |
| BRANGE t2, t1, t5, _start_hang |
| BRANGE t3, t5, t2, _start_hang |
| _relocate_copy_to_lower_loop: |
| REG_L t3, 0(t2) |
| REG_S t3, 0(t0) |
| add t0, t0, __SIZEOF_POINTER__ |
| add t2, t2, __SIZEOF_POINTER__ |
| blt t0, t1, _relocate_copy_to_lower_loop |
| jr t4 |
| _relocate_copy_to_upper: |
| ble t3, t0, _relocate_copy_to_upper_loop |
| lla t2, _relocate_lottery |
| BRANGE t0, t3, t2, _start_hang |
| lla t2, _boot_status |
| BRANGE t0, t3, t2, _start_hang |
| lla t2, _relocate |
| lla t5, _relocate_done |
| BRANGE t0, t3, t2, _start_hang |
| BRANGE t0, t3, t5, _start_hang |
| BRANGE t2, t5, t0, _start_hang |
| _relocate_copy_to_upper_loop: |
| add t3, t3, -__SIZEOF_POINTER__ |
| add t1, t1, -__SIZEOF_POINTER__ |
| REG_L t2, 0(t3) |
| REG_S t2, 0(t1) |
| blt t0, t1, _relocate_copy_to_upper_loop |
| jr t4 |
| _wait_relocate_copy_done: |
| lla t0, _fw_start |
| lla t1, _link_start |
| REG_L t1, 0(t1) |
| beq t0, t1, _wait_for_boot_hart |
| lla t2, _boot_status |
| lla t3, _wait_for_boot_hart |
| sub t3, t3, t0 |
| add t3, t3, t1 |
| 1: |
| /* waitting for relocate copy done (_boot_status == 1) */ |
| li t4, BOOT_STATUS_RELOCATE_DONE |
| REG_L t5, 0(t2) |
| /* Reduce the bus traffic so that boot hart may proceed faster */ |
| nop |
| nop |
| nop |
| bgt t4, t5, 1b |
| jr t3 |
| #endif |
| _relocate_done: |
| |
| /* |
| * Mark relocate copy done |
| * Use _boot_status copy relative to the load address |
| */ |
| lla t0, _boot_status |
| #ifndef FW_PIC |
| lla t1, _link_start |
| REG_L t1, 0(t1) |
| lla t2, _load_start |
| REG_L t2, 0(t2) |
| sub t0, t0, t1 |
| add t0, t0, t2 |
| #endif |
| li t1, BOOT_STATUS_RELOCATE_DONE |
| REG_S t1, 0(t0) |
| fence rw, rw |
| |
| /* At this point we are running from link address */ |
| |
| /* Reset all registers except ra, a0, a1 and a2 for boot HART */ |
| li ra, 0 |
| call _reset_regs |
| |
| /* Zero-out BSS */ |
| lla s4, _bss_start |
| lla s5, _bss_end |
| _bss_zero: |
| REG_S zero, (s4) |
| add s4, s4, __SIZEOF_POINTER__ |
| blt s4, s5, _bss_zero |
| |
| /* Setup temporary trap handler */ |
| lla s4, _start_hang |
| csrw CSR_MTVEC, s4 |
| |
| /* Setup temporary stack */ |
| lla s4, _fw_end |
| li s5, (SBI_SCRATCH_SIZE * 2) |
| add sp, s4, s5 |
| |
| /* Allow main firmware to save info */ |
| MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4 |
| call fw_save_info |
| MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4 |
| |
| #ifdef FW_FDT_PATH |
| /* Override previous arg1 */ |
| lla a1, fw_fdt_bin |
| #endif |
| |
| /* |
| * Initialize platform |
| * Note: The a0 to a4 registers passed to the |
| * firmware are parameters to this function. |
| */ |
| MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4 |
| call fw_platform_init |
| add t0, a0, zero |
| MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4 |
| add a1, t0, zero |
| |
| /* Preload HART details |
| * s7 -> HART Count |
| * s8 -> HART Stack Size |
| * s9 -> Heap Size |
| * s10 -> Heap Offset |
| */ |
| lla a4, platform |
| #if __riscv_xlen > 32 |
| lwu s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4) |
| lwu s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4) |
| lwu s9, SBI_PLATFORM_HEAP_SIZE_OFFSET(a4) |
| #else |
| lw s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4) |
| lw s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4) |
| lw s9, SBI_PLATFORM_HEAP_SIZE_OFFSET(a4) |
| #endif |
| |
| /* Setup scratch space for all the HARTs*/ |
| lla tp, _fw_end |
| mul a5, s7, s8 |
| add tp, tp, a5 |
| /* Setup heap base address */ |
| lla s10, _fw_start |
| sub s10, tp, s10 |
| add tp, tp, s9 |
| /* Keep a copy of tp */ |
| add t3, tp, zero |
| /* Counter */ |
| li t2, 1 |
| /* hartid 0 is mandated by ISA */ |
| li t1, 0 |
| _scratch_init: |
| /* |
| * The following registers hold values that are computed before |
| * entering this block, and should remain unchanged. |
| * |
| * t3 -> the firmware end address |
| * s7 -> HART count |
| * s8 -> HART stack size |
| * s9 -> Heap Size |
| * s10 -> Heap Offset |
| */ |
| add tp, t3, zero |
| sub tp, tp, s9 |
| mul a5, s8, t1 |
| sub tp, tp, a5 |
| li a5, SBI_SCRATCH_SIZE |
| sub tp, tp, a5 |
| |
| /* Initialize scratch space */ |
| /* Store fw_start and fw_size in scratch space */ |
| lla a4, _fw_start |
| sub a5, t3, a4 |
| REG_S a4, SBI_SCRATCH_FW_START_OFFSET(tp) |
| REG_S a5, SBI_SCRATCH_FW_SIZE_OFFSET(tp) |
| |
| /* Store R/W section's offset in scratch space */ |
| lla a5, _fw_rw_start |
| sub a5, a5, a4 |
| REG_S a5, SBI_SCRATCH_FW_RW_OFFSET(tp) |
| |
| /* Store fw_heap_offset and fw_heap_size in scratch space */ |
| REG_S s10, SBI_SCRATCH_FW_HEAP_OFFSET(tp) |
| REG_S s9, SBI_SCRATCH_FW_HEAP_SIZE_OFFSET(tp) |
| |
| /* Store next arg1 in scratch space */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| call fw_next_arg1 |
| REG_S a0, SBI_SCRATCH_NEXT_ARG1_OFFSET(tp) |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| /* Store next address in scratch space */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| call fw_next_addr |
| REG_S a0, SBI_SCRATCH_NEXT_ADDR_OFFSET(tp) |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| /* Store next mode in scratch space */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| call fw_next_mode |
| REG_S a0, SBI_SCRATCH_NEXT_MODE_OFFSET(tp) |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| /* Store warm_boot address in scratch space */ |
| lla a4, _start_warm |
| REG_S a4, SBI_SCRATCH_WARMBOOT_ADDR_OFFSET(tp) |
| /* Store platform address in scratch space */ |
| lla a4, platform |
| REG_S a4, SBI_SCRATCH_PLATFORM_ADDR_OFFSET(tp) |
| /* Store hartid-to-scratch function address in scratch space */ |
| lla a4, _hartid_to_scratch |
| REG_S a4, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET(tp) |
| /* Store trap-exit function address in scratch space */ |
| lla a4, _trap_exit |
| REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(tp) |
| /* Clear tmp0 in scratch space */ |
| REG_S zero, SBI_SCRATCH_TMP0_OFFSET(tp) |
| /* Store firmware options in scratch space */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| #ifdef FW_OPTIONS |
| li a0, FW_OPTIONS |
| #else |
| call fw_options |
| #endif |
| REG_S a0, SBI_SCRATCH_OPTIONS_OFFSET(tp) |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| /* Move to next scratch space */ |
| add t1, t1, t2 |
| blt t1, s7, _scratch_init |
| |
| /* |
| * Relocate Flatened Device Tree (FDT) |
| * source FDT address = previous arg1 |
| * destination FDT address = next arg1 |
| * |
| * Note: We will preserve a0 and a1 passed by |
| * previous booting stage. |
| */ |
| beqz a1, _fdt_reloc_done |
| /* Mask values in a4 */ |
| li a4, 0xff |
| /* t1 = destination FDT start address */ |
| MOV_3R s0, a0, s1, a1, s2, a2 |
| call fw_next_arg1 |
| add t1, a0, zero |
| MOV_3R a0, s0, a1, s1, a2, s2 |
| beqz t1, _fdt_reloc_done |
| beq t1, a1, _fdt_reloc_done |
| /* t0 = source FDT start address */ |
| add t0, a1, zero |
| /* t2 = source FDT size in big-endian */ |
| #if __riscv_xlen == 64 |
| lwu t2, 4(t0) |
| #else |
| lw t2, 4(t0) |
| #endif |
| /* t3 = bit[15:8] of FDT size */ |
| add t3, t2, zero |
| srli t3, t3, 16 |
| and t3, t3, a4 |
| slli t3, t3, 8 |
| /* t4 = bit[23:16] of FDT size */ |
| add t4, t2, zero |
| srli t4, t4, 8 |
| and t4, t4, a4 |
| slli t4, t4, 16 |
| /* t5 = bit[31:24] of FDT size */ |
| add t5, t2, zero |
| and t5, t5, a4 |
| slli t5, t5, 24 |
| /* t2 = bit[7:0] of FDT size */ |
| srli t2, t2, 24 |
| and t2, t2, a4 |
| /* t2 = FDT size in little-endian */ |
| or t2, t2, t3 |
| or t2, t2, t4 |
| or t2, t2, t5 |
| /* t2 = destination FDT end address */ |
| add t2, t1, t2 |
| /* FDT copy loop */ |
| ble t2, t1, _fdt_reloc_done |
| _fdt_reloc_again: |
| REG_L t3, 0(t0) |
| REG_S t3, 0(t1) |
| add t0, t0, __SIZEOF_POINTER__ |
| add t1, t1, __SIZEOF_POINTER__ |
| blt t1, t2, _fdt_reloc_again |
| _fdt_reloc_done: |
| |
| /* mark boot hart done */ |
| li t0, BOOT_STATUS_BOOT_HART_DONE |
| lla t1, _boot_status |
| fence rw, rw |
| REG_S t0, 0(t1) |
| j _start_warm |
| |
| /* waiting for boot hart to be done (_boot_status == 2) */ |
| _wait_for_boot_hart: |
| li t0, BOOT_STATUS_BOOT_HART_DONE |
| lla t1, _boot_status |
| REG_L t1, 0(t1) |
| /* Reduce the bus traffic so that boot hart may proceed faster */ |
| div t2, t2, zero |
| div t2, t2, zero |
| div t2, t2, zero |
| bne t0, t1, _wait_for_boot_hart |
| |
| _start_warm: |
| /* Reset all registers except ra, a0, a1 and a2 for non-boot HARTs */ |
| li ra, 0 |
| call _reset_regs |
| |
| /* Disable all interrupts */ |
| csrw CSR_MIE, zero |
| |
| /* Find HART count and HART stack size */ |
| lla a4, platform |
| #if __riscv_xlen == 64 |
| lwu s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4) |
| lwu s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4) |
| #else |
| lw s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4) |
| lw s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4) |
| #endif |
| REG_L s9, SBI_PLATFORM_HART_INDEX2ID_OFFSET(a4) |
| |
| /* Find HART id */ |
| csrr s6, CSR_MHARTID |
| |
| /* Find HART index */ |
| beqz s9, 3f |
| li a4, 0 |
| 1: |
| #if __riscv_xlen == 64 |
| lwu a5, (s9) |
| #else |
| lw a5, (s9) |
| #endif |
| beq a5, s6, 2f |
| add s9, s9, 4 |
| add a4, a4, 1 |
| blt a4, s7, 1b |
| 2: add s6, a4, zero |
| 3: bge s6, s7, _start_hang |
| |
| /* Find the scratch space based on HART index */ |
| lla tp, _fw_end |
| mul a5, s7, s8 |
| add tp, tp, a5 |
| mul a5, s8, s6 |
| sub tp, tp, a5 |
| li a5, SBI_SCRATCH_SIZE |
| sub tp, tp, a5 |
| |
| /* update the mscratch */ |
| csrw CSR_MSCRATCH, tp |
| |
| /* Setup stack */ |
| add sp, tp, zero |
| |
| /* Setup trap handler */ |
| lla a4, _trap_handler |
| #if __riscv_xlen == 32 |
| csrr a5, CSR_MISA |
| srli a5, a5, ('H' - 'A') |
| andi a5, a5, 0x1 |
| beq a5, zero, _skip_trap_handler_rv32_hyp |
| lla a4, _trap_handler_rv32_hyp |
| _skip_trap_handler_rv32_hyp: |
| #endif |
| csrw CSR_MTVEC, a4 |
| |
| #if __riscv_xlen == 32 |
| /* Override trap exit for H-extension */ |
| csrr a5, CSR_MISA |
| srli a5, a5, ('H' - 'A') |
| andi a5, a5, 0x1 |
| beq a5, zero, _skip_trap_exit_rv32_hyp |
| lla a4, _trap_exit_rv32_hyp |
| csrr a5, CSR_MSCRATCH |
| REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(a5) |
| _skip_trap_exit_rv32_hyp: |
| #endif |
| |
| /* Initialize SBI runtime */ |
| csrr a0, CSR_MSCRATCH |
| call sbi_init |
| |
| /* We don't expect to reach here hence just hang */ |
| j _start_hang |
| |
| .data |
| .align 3 |
| #ifdef FW_PIC |
| _runtime_offset: |
| RISCV_PTR 0 |
| #endif |
| _relocate_lottery: |
| RISCV_PTR 0 |
| _boot_status: |
| RISCV_PTR 0 |
| _load_start: |
| RISCV_PTR _fw_start |
| _link_start: |
| RISCV_PTR FW_TEXT_START |
| _link_end: |
| RISCV_PTR _fw_reloc_end |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _hartid_to_scratch |
| _hartid_to_scratch: |
| /* |
| * a0 -> HART ID (passed by caller) |
| * a1 -> HART Index (passed by caller) |
| * t0 -> HART Stack Size |
| * t1 -> HART Stack End |
| * t2 -> Temporary |
| */ |
| lla t2, platform |
| #if __riscv_xlen == 64 |
| lwu t0, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(t2) |
| lwu t2, SBI_PLATFORM_HART_COUNT_OFFSET(t2) |
| #else |
| lw t0, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(t2) |
| lw t2, SBI_PLATFORM_HART_COUNT_OFFSET(t2) |
| #endif |
| sub t2, t2, a1 |
| mul t2, t2, t0 |
| lla t1, _fw_end |
| add t1, t1, t2 |
| li t2, SBI_SCRATCH_SIZE |
| sub a0, t1, t2 |
| ret |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _start_hang |
| _start_hang: |
| wfi |
| j _start_hang |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .weak fw_platform_init |
| fw_platform_init: |
| add a0, a1, zero |
| ret |
| |
| /* Map implicit memcpy() added by compiler to sbi_memcpy() */ |
| .section .text |
| .align 3 |
| .globl memcpy |
| memcpy: |
| tail sbi_memcpy |
| |
| /* Map implicit memset() added by compiler to sbi_memset() */ |
| .section .text |
| .align 3 |
| .globl memset |
| memset: |
| tail sbi_memset |
| |
| /* Map implicit memmove() added by compiler to sbi_memmove() */ |
| .section .text |
| .align 3 |
| .globl memmove |
| memmove: |
| tail sbi_memmove |
| |
| /* Map implicit memcmp() added by compiler to sbi_memcmp() */ |
| .section .text |
| .align 3 |
| .globl memcmp |
| memcmp: |
| tail sbi_memcmp |
| |
| .macro TRAP_SAVE_AND_SETUP_SP_T0 |
| /* Swap TP and MSCRATCH */ |
| csrrw tp, CSR_MSCRATCH, tp |
| |
| /* Save T0 in scratch space */ |
| REG_S t0, SBI_SCRATCH_TMP0_OFFSET(tp) |
| |
| /* |
| * Set T0 to appropriate exception stack |
| * |
| * Came_From_M_Mode = ((MSTATUS.MPP < PRV_M) ? 1 : 0) - 1; |
| * Exception_Stack = TP ^ (Came_From_M_Mode & (SP ^ TP)) |
| * |
| * Came_From_M_Mode = 0 ==> Exception_Stack = TP |
| * Came_From_M_Mode = -1 ==> Exception_Stack = SP |
| */ |
| csrr t0, CSR_MSTATUS |
| srl t0, t0, MSTATUS_MPP_SHIFT |
| and t0, t0, PRV_M |
| slti t0, t0, PRV_M |
| add t0, t0, -1 |
| xor sp, sp, tp |
| and t0, t0, sp |
| xor sp, sp, tp |
| xor t0, tp, t0 |
| |
| /* Save original SP on exception stack */ |
| REG_S sp, (SBI_TRAP_REGS_OFFSET(sp) - SBI_TRAP_REGS_SIZE)(t0) |
| |
| /* Set SP to exception stack and make room for trap registers */ |
| add sp, t0, -(SBI_TRAP_REGS_SIZE) |
| |
| /* Restore T0 from scratch space */ |
| REG_L t0, SBI_SCRATCH_TMP0_OFFSET(tp) |
| |
| /* Save T0 on stack */ |
| REG_S t0, SBI_TRAP_REGS_OFFSET(t0)(sp) |
| |
| /* Swap TP and MSCRATCH */ |
| csrrw tp, CSR_MSCRATCH, tp |
| .endm |
| |
| .macro TRAP_SAVE_MEPC_MSTATUS have_mstatush |
| /* Save MEPC and MSTATUS CSRs */ |
| csrr t0, CSR_MEPC |
| REG_S t0, SBI_TRAP_REGS_OFFSET(mepc)(sp) |
| csrr t0, CSR_MSTATUS |
| REG_S t0, SBI_TRAP_REGS_OFFSET(mstatus)(sp) |
| .if \have_mstatush |
| csrr t0, CSR_MSTATUSH |
| REG_S t0, SBI_TRAP_REGS_OFFSET(mstatusH)(sp) |
| .else |
| REG_S zero, SBI_TRAP_REGS_OFFSET(mstatusH)(sp) |
| .endif |
| .endm |
| |
| .macro TRAP_SAVE_GENERAL_REGS_EXCEPT_SP_T0 |
| /* Save all general regisers except SP and T0 */ |
| REG_S zero, SBI_TRAP_REGS_OFFSET(zero)(sp) |
| REG_S ra, SBI_TRAP_REGS_OFFSET(ra)(sp) |
| REG_S gp, SBI_TRAP_REGS_OFFSET(gp)(sp) |
| REG_S tp, SBI_TRAP_REGS_OFFSET(tp)(sp) |
| REG_S t1, SBI_TRAP_REGS_OFFSET(t1)(sp) |
| REG_S t2, SBI_TRAP_REGS_OFFSET(t2)(sp) |
| REG_S s0, SBI_TRAP_REGS_OFFSET(s0)(sp) |
| REG_S s1, SBI_TRAP_REGS_OFFSET(s1)(sp) |
| REG_S a0, SBI_TRAP_REGS_OFFSET(a0)(sp) |
| REG_S a1, SBI_TRAP_REGS_OFFSET(a1)(sp) |
| REG_S a2, SBI_TRAP_REGS_OFFSET(a2)(sp) |
| REG_S a3, SBI_TRAP_REGS_OFFSET(a3)(sp) |
| REG_S a4, SBI_TRAP_REGS_OFFSET(a4)(sp) |
| REG_S a5, SBI_TRAP_REGS_OFFSET(a5)(sp) |
| REG_S a6, SBI_TRAP_REGS_OFFSET(a6)(sp) |
| REG_S a7, SBI_TRAP_REGS_OFFSET(a7)(sp) |
| REG_S s2, SBI_TRAP_REGS_OFFSET(s2)(sp) |
| REG_S s3, SBI_TRAP_REGS_OFFSET(s3)(sp) |
| REG_S s4, SBI_TRAP_REGS_OFFSET(s4)(sp) |
| REG_S s5, SBI_TRAP_REGS_OFFSET(s5)(sp) |
| REG_S s6, SBI_TRAP_REGS_OFFSET(s6)(sp) |
| REG_S s7, SBI_TRAP_REGS_OFFSET(s7)(sp) |
| REG_S s8, SBI_TRAP_REGS_OFFSET(s8)(sp) |
| REG_S s9, SBI_TRAP_REGS_OFFSET(s9)(sp) |
| REG_S s10, SBI_TRAP_REGS_OFFSET(s10)(sp) |
| REG_S s11, SBI_TRAP_REGS_OFFSET(s11)(sp) |
| REG_S t3, SBI_TRAP_REGS_OFFSET(t3)(sp) |
| REG_S t4, SBI_TRAP_REGS_OFFSET(t4)(sp) |
| REG_S t5, SBI_TRAP_REGS_OFFSET(t5)(sp) |
| REG_S t6, SBI_TRAP_REGS_OFFSET(t6)(sp) |
| .endm |
| |
| .macro TRAP_CALL_C_ROUTINE |
| /* Call C routine */ |
| add a0, sp, zero |
| call sbi_trap_handler |
| .endm |
| |
| .macro TRAP_RESTORE_GENERAL_REGS_EXCEPT_A0_T0 |
| /* Restore all general regisers except A0 and T0 */ |
| REG_L ra, SBI_TRAP_REGS_OFFSET(ra)(a0) |
| REG_L sp, SBI_TRAP_REGS_OFFSET(sp)(a0) |
| REG_L gp, SBI_TRAP_REGS_OFFSET(gp)(a0) |
| REG_L tp, SBI_TRAP_REGS_OFFSET(tp)(a0) |
| REG_L t1, SBI_TRAP_REGS_OFFSET(t1)(a0) |
| REG_L t2, SBI_TRAP_REGS_OFFSET(t2)(a0) |
| REG_L s0, SBI_TRAP_REGS_OFFSET(s0)(a0) |
| REG_L s1, SBI_TRAP_REGS_OFFSET(s1)(a0) |
| REG_L a1, SBI_TRAP_REGS_OFFSET(a1)(a0) |
| REG_L a2, SBI_TRAP_REGS_OFFSET(a2)(a0) |
| REG_L a3, SBI_TRAP_REGS_OFFSET(a3)(a0) |
| REG_L a4, SBI_TRAP_REGS_OFFSET(a4)(a0) |
| REG_L a5, SBI_TRAP_REGS_OFFSET(a5)(a0) |
| REG_L a6, SBI_TRAP_REGS_OFFSET(a6)(a0) |
| REG_L a7, SBI_TRAP_REGS_OFFSET(a7)(a0) |
| REG_L s2, SBI_TRAP_REGS_OFFSET(s2)(a0) |
| REG_L s3, SBI_TRAP_REGS_OFFSET(s3)(a0) |
| REG_L s4, SBI_TRAP_REGS_OFFSET(s4)(a0) |
| REG_L s5, SBI_TRAP_REGS_OFFSET(s5)(a0) |
| REG_L s6, SBI_TRAP_REGS_OFFSET(s6)(a0) |
| REG_L s7, SBI_TRAP_REGS_OFFSET(s7)(a0) |
| REG_L s8, SBI_TRAP_REGS_OFFSET(s8)(a0) |
| REG_L s9, SBI_TRAP_REGS_OFFSET(s9)(a0) |
| REG_L s10, SBI_TRAP_REGS_OFFSET(s10)(a0) |
| REG_L s11, SBI_TRAP_REGS_OFFSET(s11)(a0) |
| REG_L t3, SBI_TRAP_REGS_OFFSET(t3)(a0) |
| REG_L t4, SBI_TRAP_REGS_OFFSET(t4)(a0) |
| REG_L t5, SBI_TRAP_REGS_OFFSET(t5)(a0) |
| REG_L t6, SBI_TRAP_REGS_OFFSET(t6)(a0) |
| .endm |
| |
| .macro TRAP_RESTORE_MEPC_MSTATUS have_mstatush |
| /* Restore MEPC and MSTATUS CSRs */ |
| REG_L t0, SBI_TRAP_REGS_OFFSET(mepc)(a0) |
| csrw CSR_MEPC, t0 |
| REG_L t0, SBI_TRAP_REGS_OFFSET(mstatus)(a0) |
| csrw CSR_MSTATUS, t0 |
| .if \have_mstatush |
| REG_L t0, SBI_TRAP_REGS_OFFSET(mstatusH)(a0) |
| csrw CSR_MSTATUSH, t0 |
| .endif |
| .endm |
| |
| .macro TRAP_RESTORE_A0_T0 |
| /* Restore T0 */ |
| REG_L t0, SBI_TRAP_REGS_OFFSET(t0)(a0) |
| |
| /* Restore A0 */ |
| REG_L a0, SBI_TRAP_REGS_OFFSET(a0)(a0) |
| .endm |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _trap_handler |
| .globl _trap_exit |
| _trap_handler: |
| TRAP_SAVE_AND_SETUP_SP_T0 |
| |
| TRAP_SAVE_MEPC_MSTATUS 0 |
| |
| TRAP_SAVE_GENERAL_REGS_EXCEPT_SP_T0 |
| |
| TRAP_CALL_C_ROUTINE |
| |
| _trap_exit: |
| TRAP_RESTORE_GENERAL_REGS_EXCEPT_A0_T0 |
| |
| TRAP_RESTORE_MEPC_MSTATUS 0 |
| |
| TRAP_RESTORE_A0_T0 |
| |
| mret |
| |
| #if __riscv_xlen == 32 |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _trap_handler_rv32_hyp |
| .globl _trap_exit_rv32_hyp |
| _trap_handler_rv32_hyp: |
| TRAP_SAVE_AND_SETUP_SP_T0 |
| |
| TRAP_SAVE_MEPC_MSTATUS 1 |
| |
| TRAP_SAVE_GENERAL_REGS_EXCEPT_SP_T0 |
| |
| TRAP_CALL_C_ROUTINE |
| |
| _trap_exit_rv32_hyp: |
| TRAP_RESTORE_GENERAL_REGS_EXCEPT_A0_T0 |
| |
| TRAP_RESTORE_MEPC_MSTATUS 1 |
| |
| TRAP_RESTORE_A0_T0 |
| |
| mret |
| #endif |
| |
| .section .entry, "ax", %progbits |
| .align 3 |
| .globl _reset_regs |
| _reset_regs: |
| |
| /* flush the instruction cache */ |
| fence.i |
| /* Reset all registers except ra, a0, a1 and a2 */ |
| li sp, 0 |
| li gp, 0 |
| li tp, 0 |
| li t0, 0 |
| li t1, 0 |
| li t2, 0 |
| li s0, 0 |
| li s1, 0 |
| li a3, 0 |
| li a4, 0 |
| li a5, 0 |
| li a6, 0 |
| li a7, 0 |
| li s2, 0 |
| li s3, 0 |
| li s4, 0 |
| li s5, 0 |
| li s6, 0 |
| li s7, 0 |
| li s8, 0 |
| li s9, 0 |
| li s10, 0 |
| li s11, 0 |
| li t3, 0 |
| li t4, 0 |
| li t5, 0 |
| li t6, 0 |
| csrw CSR_MSCRATCH, 0 |
| |
| ret |
| |
| #ifdef FW_FDT_PATH |
| .section .rodata |
| .align 4 |
| .globl fw_fdt_bin |
| fw_fdt_bin: |
| .incbin FW_FDT_PATH |
| #ifdef FW_FDT_PADDING |
| .fill FW_FDT_PADDING, 1, 0 |
| #endif |
| #endif |
