| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <mcall.h> |
| #include <stdint.h> |
| #include <arch/exception.h> |
| #include <sbi.h> |
| #include <vm.h> |
| #include <console/uart.h> |
| #include <commonlib/helpers.h> |
| |
| static uintptr_t send_ipi(uintptr_t *pmask, intptr_t type) |
| { |
| uintptr_t mask = mprv_read_uintptr_t(pmask); |
| for (int i = 0; mask; i++) { |
| if (mask & 1) { |
| OTHER_HLS(i)->ipi_pending |= type; |
| /* send soft interrupt to target hart */ |
| set_msip(i, 1); |
| } |
| mask = mask >> 1; |
| } |
| return 0; |
| } |
| |
| static uintptr_t sbi_set_timer(uint64_t when) |
| { |
| clear_csr(mip, MIP_STIP); |
| set_csr(mie, MIP_MTIP); |
| *(HLS()->timecmp) = when; |
| return 0; |
| } |
| |
| #if CONFIG(CONSOLE_SERIAL) |
| static uintptr_t sbi_console_putchar(uint8_t ch) |
| { |
| uart_tx_byte(CONFIG_UART_FOR_CONSOLE, ch); |
| return 0; |
| } |
| |
| static uintptr_t sbi_console_getchar(void) |
| { |
| return uart_rx_byte(CONFIG_UART_FOR_CONSOLE); |
| } |
| #endif |
| |
| static uintptr_t sbi_clear_ipi(void) |
| { |
| clear_csr(mip, MIP_SSIP); |
| return 0; |
| } |
| |
| |
| /* |
| * sbi is triggered by the s-mode ecall |
| * parameter : register a0 a1 a2 |
| * function : register a7 |
| * return : register a0 |
| */ |
| void handle_sbi(trapframe *tf) |
| { |
| uintptr_t ret = 0; |
| uintptr_t arg0 = tf->gpr[10]; |
| __unused uintptr_t arg1 = tf->gpr[11]; |
| uintptr_t which = tf->gpr[17]; |
| |
| switch (which) { |
| case SBI_SET_TIMER: |
| #if __riscv_xlen == 32 |
| ret = sbi_set_timer(arg0 + ((uint64_t)arg1 << 32)); |
| #else |
| ret = sbi_set_timer(arg0); |
| #endif |
| break; |
| #if CONFIG(CONSOLE_SERIAL) |
| case SBI_CONSOLE_PUTCHAR: |
| ret = sbi_console_putchar(arg0); |
| break; |
| case SBI_CONSOLE_GETCHAR: |
| ret = sbi_console_getchar(); |
| break; |
| #endif |
| case SBI_CLEAR_IPI: |
| ret = sbi_clear_ipi(); |
| break; |
| case SBI_SEND_IPI: |
| ret = send_ipi((uintptr_t *)arg0, IPI_SOFT); |
| break; |
| case SBI_REMOTE_FENCE_I: |
| ret = send_ipi((uintptr_t *)arg0, IPI_FENCE_I); |
| break; |
| case SBI_REMOTE_SFENCE_VMA: |
| ret = send_ipi((uintptr_t *)arg0, IPI_SFENCE_VMA); |
| break; |
| case SBI_REMOTE_SFENCE_VMA_ASID: |
| ret = send_ipi((uintptr_t *)arg0, IPI_SFENCE_VMA_ASID); |
| break; |
| case SBI_SHUTDOWN: |
| ret = send_ipi((uintptr_t *)arg0, IPI_SHUTDOWN); |
| break; |
| default: |
| ret = -SBI_ENOSYS; |
| break; |
| } |
| tf->gpr[10] = ret; |
| write_csr(mepc, read_csr(mepc) + 4); |
| } |