mirror of
https://github.com/riscv-software-src/opensbi.git
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90cb4917b5
Currently, OpenSBI doesn't distinguish between sfence.vma and sfence.vm asid calls. Moreover, it ignores the page ranges and just flush entire TLB everytime. Fix the sfence implementation by keeping all the tlb flush info in scratch area. The relevant Linux kernel code was added by https://patchwork.kernel.org/project/linux-riscv/list/?series=89695 However, this patch is backward compatible with older version kernel that doesn't have the above patches as well. Fixes #87 Signed-off-by: Atish Patra <atish.patra@wdc.com>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/*
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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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#include <sbi/sbi_console.h>
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#include <sbi/sbi_ecall.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_ipi.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_timer.h>
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#include <sbi/sbi_trap.h>
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#define SBI_ECALL_VERSION_MAJOR 0
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#define SBI_ECALL_VERSION_MINOR 1
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u16 sbi_ecall_version_major(void)
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{
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return SBI_ECALL_VERSION_MAJOR;
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}
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u16 sbi_ecall_version_minor(void)
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{
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return SBI_ECALL_VERSION_MINOR;
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}
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int sbi_ecall_handler(u32 hartid, ulong mcause,
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struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch)
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{
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int ret = SBI_ENOTSUPP;
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struct sbi_tlb_info tlb_info;
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switch (regs->a7) {
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case SBI_ECALL_SET_TIMER:
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#if __riscv_xlen == 32
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sbi_timer_event_start(scratch,
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(((u64)regs->a1 << 32) | (u64)regs->a0));
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#else
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sbi_timer_event_start(scratch, (u64)regs->a0);
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#endif
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ret = 0;
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break;
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case SBI_ECALL_CONSOLE_PUTCHAR:
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sbi_putc(regs->a0);
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ret = 0;
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break;
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case SBI_ECALL_CONSOLE_GETCHAR:
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regs->a0 = sbi_getc();
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ret = 0;
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break;
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case SBI_ECALL_CLEAR_IPI:
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sbi_ipi_clear_smode(scratch);
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ret = 0;
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break;
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case SBI_ECALL_SEND_IPI:
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ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
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SBI_IPI_EVENT_SOFT, NULL);
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break;
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case SBI_ECALL_REMOTE_FENCE_I:
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ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
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SBI_IPI_EVENT_FENCE_I, NULL);
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break;
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case SBI_ECALL_REMOTE_SFENCE_VMA:
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tlb_info.start = (unsigned long)regs->a1;
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tlb_info.size = (unsigned long)regs->a2;
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ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
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SBI_IPI_EVENT_SFENCE_VMA, &tlb_info);
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break;
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case SBI_ECALL_REMOTE_SFENCE_VMA_ASID:
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tlb_info.start = (unsigned long)regs->a1;
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tlb_info.size = (unsigned long)regs->a2;
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tlb_info.asid = (unsigned long)regs->a3;
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ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
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SBI_IPI_EVENT_SFENCE_VMA_ASID, &tlb_info);
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break;
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case SBI_ECALL_SHUTDOWN:
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sbi_system_shutdown(scratch, 0);
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ret = 0;
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break;
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default:
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break;
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};
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if (!ret) {
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regs->mepc += 4;
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}
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return ret;
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}
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