forked from Mirrors/opensbi
c3e31cbf36
When a probe implementation just returns zero for not available and one for available then we don't need it, as the extension won't be registered at all if it would return zero and the Base extension probe function will already set out_val to 1 if not probe function is implemented. Currently all probe functions only return zero or one, so remove them all. Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Ventana Micro Systems Inc.
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*
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* Authors:
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* Anup Patel <apatel@ventanamicro.com>
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*/
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#include <sbi/sbi_console.h>
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#include <sbi/sbi_domain.h>
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#include <sbi/sbi_error.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_trap.h>
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#include <sbi/riscv_asm.h>
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static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
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const struct sbi_trap_regs *regs,
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unsigned long *out_val,
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struct sbi_trap_info *out_trap)
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{
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ulong smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
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MSTATUS_MPP_SHIFT;
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switch (funcid) {
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case SBI_EXT_DBCN_CONSOLE_WRITE:
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case SBI_EXT_DBCN_CONSOLE_READ:
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/*
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* On RV32, the M-mode can only access the first 4GB of
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* the physical address space because M-mode does not have
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* MMU to access full 34-bit physical address space.
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*
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* Based on above, we simply fail if the upper 32bits of
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* the physical address (i.e. a2 register) is non-zero on
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* RV32.
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*/
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#if __riscv_xlen == 32
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if (regs->a2)
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return SBI_ERR_FAILED;
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#endif
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if (!sbi_domain_check_addr_range(sbi_domain_thishart_ptr(),
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regs->a1, regs->a0, smode,
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SBI_DOMAIN_READ|SBI_DOMAIN_WRITE))
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return SBI_ERR_INVALID_PARAM;
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if (funcid == SBI_EXT_DBCN_CONSOLE_WRITE)
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*out_val = sbi_nputs((const char *)regs->a1, regs->a0);
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else
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*out_val = sbi_ngets((char *)regs->a1, regs->a0);
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return 0;
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case SBI_EXT_DBCN_CONSOLE_WRITE_BYTE:
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sbi_putc(regs->a0);
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return 0;
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default:
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break;
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}
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return SBI_ENOTSUPP;
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}
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struct sbi_ecall_extension ecall_dbcn;
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static int sbi_ecall_dbcn_register_extensions(void)
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{
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if (!sbi_console_get_device())
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return 0;
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return sbi_ecall_register_extension(&ecall_dbcn);
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}
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struct sbi_ecall_extension ecall_dbcn = {
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.extid_start = SBI_EXT_DBCN,
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.extid_end = SBI_EXT_DBCN,
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.register_extensions = sbi_ecall_dbcn_register_extensions,
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.handle = sbi_ecall_dbcn_handler,
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};
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