mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2025-08-24 23:41:23 +01:00
3284bea833
Some of the upcoming SBI extensions (such as SSE) will directly update register state so improve the prototype of ecall handler to accommodate this. Further, this flexibility allows us to push the trap redirection from sbi_ecall_handler() to the sbi_ecall_legacy_handler(). Signed-off-by: Anup Patel <apatel@ventanamicro.com>
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
|
|
*
|
|
* Authors:
|
|
* Anup Patel <anup.patel@wdc.com>
|
|
* Atish Patra <atish.patra@wdc.com>
|
|
*/
|
|
|
|
#include <sbi/sbi_ecall.h>
|
|
#include <sbi/sbi_ecall_interface.h>
|
|
#include <sbi/sbi_error.h>
|
|
#include <sbi/sbi_trap.h>
|
|
#include <sbi/sbi_version.h>
|
|
#include <sbi/riscv_asm.h>
|
|
|
|
static int sbi_ecall_base_probe(unsigned long extid, unsigned long *out_val)
|
|
{
|
|
struct sbi_ecall_extension *ext;
|
|
|
|
ext = sbi_ecall_find_extension(extid);
|
|
if (!ext) {
|
|
*out_val = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (ext->probe)
|
|
return ext->probe(extid, out_val);
|
|
|
|
*out_val = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int sbi_ecall_base_handler(unsigned long extid, unsigned long funcid,
|
|
struct sbi_trap_regs *regs,
|
|
struct sbi_ecall_return *out)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (funcid) {
|
|
case SBI_EXT_BASE_GET_SPEC_VERSION:
|
|
out->value = (SBI_ECALL_VERSION_MAJOR <<
|
|
SBI_SPEC_VERSION_MAJOR_OFFSET) &
|
|
(SBI_SPEC_VERSION_MAJOR_MASK <<
|
|
SBI_SPEC_VERSION_MAJOR_OFFSET);
|
|
out->value = out->value | SBI_ECALL_VERSION_MINOR;
|
|
break;
|
|
case SBI_EXT_BASE_GET_IMP_ID:
|
|
out->value = sbi_ecall_get_impid();
|
|
break;
|
|
case SBI_EXT_BASE_GET_IMP_VERSION:
|
|
out->value = OPENSBI_VERSION;
|
|
break;
|
|
case SBI_EXT_BASE_GET_MVENDORID:
|
|
out->value = csr_read(CSR_MVENDORID);
|
|
break;
|
|
case SBI_EXT_BASE_GET_MARCHID:
|
|
out->value = csr_read(CSR_MARCHID);
|
|
break;
|
|
case SBI_EXT_BASE_GET_MIMPID:
|
|
out->value = csr_read(CSR_MIMPID);
|
|
break;
|
|
case SBI_EXT_BASE_PROBE_EXT:
|
|
ret = sbi_ecall_base_probe(regs->a0, &out->value);
|
|
break;
|
|
default:
|
|
ret = SBI_ENOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct sbi_ecall_extension ecall_base;
|
|
|
|
static int sbi_ecall_base_register_extensions(void)
|
|
{
|
|
return sbi_ecall_register_extension(&ecall_base);
|
|
}
|
|
|
|
struct sbi_ecall_extension ecall_base = {
|
|
.extid_start = SBI_EXT_BASE,
|
|
.extid_end = SBI_EXT_BASE,
|
|
.register_extensions = sbi_ecall_base_register_extensions,
|
|
.handle = sbi_ecall_base_handler,
|
|
};
|