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lib: sbi: Implement SBI debug console extension
We implement SBI debug console extension as one of the replacement SBI extensions. This extension is only available when OpenSBI platform provides a console device to generic library. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Bin Meng <bmeng@tinylab.org>
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@ -26,6 +26,10 @@ config SBI_ECALL_PMU
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bool "Performance Monitoring Unit extension"
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default y
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config SBI_ECALL_DBCN
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bool "Debug Console extension"
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default y
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config SBI_ECALL_LEGACY
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bool "SBI v0.1 legacy extensions"
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default y
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@ -37,6 +37,9 @@ libsbi-objs-$(CONFIG_SBI_ECALL_SRST) += sbi_ecall_srst.o
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carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_PMU) += ecall_pmu
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libsbi-objs-$(CONFIG_SBI_ECALL_PMU) += sbi_ecall_pmu.o
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carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_DBCN) += ecall_dbcn
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libsbi-objs-$(CONFIG_SBI_ECALL_DBCN) += sbi_ecall_dbcn.o
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carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_LEGACY) += ecall_legacy
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libsbi-objs-$(CONFIG_SBI_ECALL_LEGACY) += sbi_ecall_legacy.o
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72
lib/sbi/sbi_ecall_dbcn.c
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72
lib/sbi/sbi_ecall_dbcn.c
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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) 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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static int sbi_ecall_dbcn_probe(unsigned long extid, unsigned long *out_val)
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{
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*out_val = sbi_console_get_device() ? 1 : 0;
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return 0;
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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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.handle = sbi_ecall_dbcn_handler,
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.probe = sbi_ecall_dbcn_probe,
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};
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