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https://github.com/riscv-software-src/opensbi.git
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Rahul Pathak
35af7c8c7e
*_map_range and *_unmap_range functions are required in M-Mode to get the temporary access to S-Mode and U-Mode regions. Thse functions only operate using the TYPE_MEMORY memory protection mechanisms. Rename them to reflect the actual usage of these functions and let generic map/unmap_range names to implement generic functions Signed-off-by: Rahul Pathak <rahul.pathak@oss.qualcomm.com> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Pawandeep Oza <pawandeep.oza@oss.qualcomm.com> Link: https://lore.kernel.org/r/20260820121309.2551296-2-rahul.pathak@oss.qualcomm.com Signed-off-by: Anup Patel <anup@brainfault.org>
83 lines
2.1 KiB
C
83 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) 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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#include <sbi/sbi_hart_protection.h>
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static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
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struct sbi_trap_regs *regs,
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struct sbi_ecall_return *out)
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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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* Analogously, we fail if the upper 64bit of the
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* physical address (i.e. a2 register) is non-zero on
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* RV64.
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*/
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if (regs->a2)
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return SBI_ERR_FAILED;
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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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sbi_hart_protection_temp_map_range(regs->a1, regs->a0);
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if (funcid == SBI_EXT_DBCN_CONSOLE_WRITE)
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out->value = sbi_nputs((const char *)regs->a1, regs->a0);
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else
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out->value = sbi_ngets((char *)regs->a1, regs->a0);
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sbi_hart_protection_temp_unmap_range(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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.name = "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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