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>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
|
|
#include <sbi/sbi_ecall.h>
|
|
#include <sbi/sbi_ecall_interface.h>
|
|
#include <sbi/sbi_error.h>
|
|
#include <sbi/sbi_trap.h>
|
|
#include <sbi/sbi_system.h>
|
|
|
|
static int sbi_ecall_susp_handler(unsigned long extid, unsigned long funcid,
|
|
struct sbi_trap_regs *regs,
|
|
struct sbi_ecall_return *out)
|
|
{
|
|
int ret = SBI_ENOTSUPP;
|
|
|
|
if (funcid == SBI_EXT_SUSP_SUSPEND)
|
|
ret = sbi_system_suspend(regs->a0, regs->a1, regs->a2);
|
|
|
|
if (ret >= 0) {
|
|
out->value = ret;
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool susp_available(void)
|
|
{
|
|
u32 type;
|
|
|
|
/*
|
|
* At least one suspend type should be supported by the
|
|
* platform for the SBI SUSP extension to be usable.
|
|
*/
|
|
for (type = 0; type <= SBI_SUSP_SLEEP_TYPE_LAST; type++) {
|
|
if (sbi_system_suspend_supported(type))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
struct sbi_ecall_extension ecall_susp;
|
|
|
|
static int sbi_ecall_susp_register_extensions(void)
|
|
{
|
|
if (!susp_available())
|
|
return 0;
|
|
|
|
return sbi_ecall_register_extension(&ecall_susp);
|
|
}
|
|
|
|
struct sbi_ecall_extension ecall_susp = {
|
|
.extid_start = SBI_EXT_SUSP,
|
|
.extid_end = SBI_EXT_SUSP,
|
|
.register_extensions = sbi_ecall_susp_register_extensions,
|
|
.handle = sbi_ecall_susp_handler,
|
|
};
|