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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#include <sbi/sbi_console.h>
#include <sbi/sbi_domain.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_trap.h>
#include <sbi/riscv_asm.h>
#include <sbi/sbi_hart.h>
static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
ulong smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
MSTATUS_MPP_SHIFT;
switch (funcid) {
case SBI_EXT_DBCN_CONSOLE_WRITE:
case SBI_EXT_DBCN_CONSOLE_READ:
/*
* On RV32, the M-mode can only access the first 4GB of
* the physical address space because M-mode does not have
* MMU to access full 34-bit physical address space.
*
* Based on above, we simply fail if the upper 32bits of
* the physical address (i.e. a2 register) is non-zero on
* RV32.
*
* Analogously, we fail if the upper 64bit of the
* physical address (i.e. a2 register) is non-zero on
* RV64.
*/
if (regs->a2)
return SBI_ERR_FAILED;
if (!sbi_domain_check_addr_range(sbi_domain_thishart_ptr(),
regs->a1, regs->a0, smode,
SBI_DOMAIN_READ|SBI_DOMAIN_WRITE))
return SBI_ERR_INVALID_PARAM;
sbi_hart_map_saddr(regs->a1, regs->a0);
if (funcid == SBI_EXT_DBCN_CONSOLE_WRITE)
out->value = sbi_nputs((const char *)regs->a1, regs->a0);
else
out->value = sbi_ngets((char *)regs->a1, regs->a0);
sbi_hart_unmap_saddr();
return 0;
case SBI_EXT_DBCN_CONSOLE_WRITE_BYTE:
sbi_putc(regs->a0);
return 0;
default:
break;
}
return SBI_ENOTSUPP;
}
struct sbi_ecall_extension ecall_dbcn;
static int sbi_ecall_dbcn_register_extensions(void)
{
if (!sbi_console_get_device())
return 0;
return sbi_ecall_register_extension(&ecall_dbcn);
}
struct sbi_ecall_extension ecall_dbcn = {
.extid_start = SBI_EXT_DBCN,
.extid_end = SBI_EXT_DBCN,
.register_extensions = sbi_ecall_dbcn_register_extensions,
.handle = sbi_ecall_dbcn_handler,
};
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