target/riscv: Handle KVM_EXIT_RISCV_SBI exit
Use char-fe to handle console sbi call, which implement early console io while apply 'earlycon=sbi' into kernel parameters. Signed-off-by: Yifei Jiang <jiangyifei@huawei.com> Signed-off-by: Mingwang Li <limingwang@huawei.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20220112081329.1835-9-jiangyifei@huawei.com Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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@ -38,6 +38,8 @@
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#include "qemu/log.h"
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#include "hw/loader.h"
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#include "kvm_riscv.h"
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#include "sbi_ecall_interface.h"
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#include "chardev/char-fe.h"
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static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
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uint64_t idx)
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@ -367,9 +369,47 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cs)
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return true;
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}
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static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
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{
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int ret = 0;
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unsigned char ch;
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switch (run->riscv_sbi.extension_id) {
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case SBI_EXT_0_1_CONSOLE_PUTCHAR:
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ch = run->riscv_sbi.args[0];
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qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
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break;
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case SBI_EXT_0_1_CONSOLE_GETCHAR:
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ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
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if (ret == sizeof(ch)) {
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run->riscv_sbi.args[0] = ch;
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} else {
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run->riscv_sbi.args[0] = -1;
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}
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break;
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default:
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qemu_log_mask(LOG_UNIMP,
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"%s: un-handled SBI EXIT, specific reasons is %lu\n",
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__func__, run->riscv_sbi.extension_id);
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ret = -1;
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break;
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}
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return ret;
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}
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int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
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{
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return 0;
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int ret = 0;
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switch (run->exit_reason) {
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case KVM_EXIT_RISCV_SBI:
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ret = kvm_riscv_handle_sbi(cs, run);
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break;
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default:
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qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
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__func__, run->exit_reason);
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ret = -1;
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break;
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}
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return ret;
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}
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void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
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@ -0,0 +1,72 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __SBI_ECALL_INTERFACE_H__
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#define __SBI_ECALL_INTERFACE_H__
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/* clang-format off */
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/* SBI Extension IDs */
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#define SBI_EXT_0_1_SET_TIMER 0x0
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#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
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#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
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#define SBI_EXT_0_1_CLEAR_IPI 0x3
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#define SBI_EXT_0_1_SEND_IPI 0x4
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#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5
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#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6
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#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7
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#define SBI_EXT_0_1_SHUTDOWN 0x8
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#define SBI_EXT_BASE 0x10
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#define SBI_EXT_TIME 0x54494D45
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#define SBI_EXT_IPI 0x735049
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#define SBI_EXT_RFENCE 0x52464E43
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#define SBI_EXT_HSM 0x48534D
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/* SBI function IDs for BASE extension*/
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#define SBI_EXT_BASE_GET_SPEC_VERSION 0x0
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#define SBI_EXT_BASE_GET_IMP_ID 0x1
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#define SBI_EXT_BASE_GET_IMP_VERSION 0x2
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#define SBI_EXT_BASE_PROBE_EXT 0x3
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#define SBI_EXT_BASE_GET_MVENDORID 0x4
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#define SBI_EXT_BASE_GET_MARCHID 0x5
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#define SBI_EXT_BASE_GET_MIMPID 0x6
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/* SBI function IDs for TIME extension*/
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#define SBI_EXT_TIME_SET_TIMER 0x0
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/* SBI function IDs for IPI extension*/
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#define SBI_EXT_IPI_SEND_IPI 0x0
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/* SBI function IDs for RFENCE extension*/
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#define SBI_EXT_RFENCE_REMOTE_FENCE_I 0x0
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#define SBI_EXT_RFENCE_REMOTE_SFENCE_VMA 0x1
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#define SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID 0x2
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA 0x3
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID 0x4
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA 0x5
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID 0x6
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/* SBI function IDs for HSM extension */
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#define SBI_EXT_HSM_HART_START 0x0
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#define SBI_EXT_HSM_HART_STOP 0x1
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#define SBI_EXT_HSM_HART_GET_STATUS 0x2
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#define SBI_HSM_HART_STATUS_STARTED 0x0
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#define SBI_HSM_HART_STATUS_STOPPED 0x1
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#define SBI_HSM_HART_STATUS_START_PENDING 0x2
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#define SBI_HSM_HART_STATUS_STOP_PENDING 0x3
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#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
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#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
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#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
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#define SBI_EXT_VENDOR_START 0x09000000
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#define SBI_EXT_VENDOR_END 0x09FFFFFF
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/* clang-format on */
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#endif
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