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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_tlb.h>
#include <sbi/sbi_trap.h>
#define SBI_ECALL_VERSION_MAJOR 0
#define SBI_ECALL_VERSION_MINOR 1
u16 sbi_ecall_version_major(void)
{
return SBI_ECALL_VERSION_MAJOR;
}
u16 sbi_ecall_version_minor(void)
{
return SBI_ECALL_VERSION_MINOR;
}
int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch)
{
int ret = SBI_ENOTSUPP;
struct unpriv_trap uptrap;
struct sbi_tlb_info tlb_info;
switch (regs->a7) {
case SBI_ECALL_SET_TIMER:
#if __riscv_xlen == 32
sbi_timer_event_start(scratch,
(((u64)regs->a1 << 32) | (u64)regs->a0));
#else
sbi_timer_event_start(scratch, (u64)regs->a0);
#endif
ret = 0;
break;
case SBI_ECALL_CONSOLE_PUTCHAR:
sbi_putc(regs->a0);
ret = 0;
break;
case SBI_ECALL_CONSOLE_GETCHAR:
regs->a0 = sbi_getc();
ret = 0;
break;
case SBI_ECALL_CLEAR_IPI:
sbi_ipi_clear_smode(scratch);
ret = 0;
break;
case SBI_ECALL_SEND_IPI:
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)regs->a0,
SBI_IPI_EVENT_SOFT, NULL);
break;
case SBI_ECALL_REMOTE_FENCE_I:
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)regs->a0,
SBI_IPI_EVENT_FENCE_I, NULL);
break;
case SBI_ECALL_REMOTE_SFENCE_VMA:
tlb_info.start = (unsigned long)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
tlb_info.type = SBI_TLB_FLUSH_VMA;
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)regs->a0,
SBI_IPI_EVENT_SFENCE_VMA, &tlb_info);
break;
case SBI_ECALL_REMOTE_SFENCE_VMA_ASID:
tlb_info.start = (unsigned long)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
tlb_info.asid = (unsigned long)regs->a3;
tlb_info.type = SBI_TLB_FLUSH_VMA_ASID;
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)regs->a0,
SBI_IPI_EVENT_SFENCE_VMA_ASID,
&tlb_info);
break;
case SBI_ECALL_SHUTDOWN:
sbi_system_shutdown(scratch, 0);
ret = 0;
break;
default:
regs->a0 = SBI_ENOTSUPP;
ret = 0;
break;
};
if (!ret) {
regs->mepc += 4;
} else if (ret == SBI_ETRAP) {
ret = 0;
sbi_trap_redirect(regs, scratch, regs->mepc,
uptrap.cause, uptrap.tval);
}
return ret;
}
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