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lib: Implement Hart State Management (HSM) SBI extension

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This patch adds support HSM extension. The specification is available
at https://github.com/riscv/riscv-sbi-doc.

It allows to implement hart hotplug and fixed ordered hart booting in
supervisor.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-02-11 17:32:39 -08:00
committed by Anup Patel
parent 5b4824082f
commit e3f69fc1e9
5 changed files with 62 additions and 0 deletions
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51
lib/sbi/sbi_ecall_hsm.c Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* 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_version.h>
#include <sbi/sbi_hsm.h>
#include <sbi/riscv_asm.h>
static int sbi_ecall_hsm_handler(struct sbi_scratch *scratch,
unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
int ret = 0;
int hstate;
switch (funcid) {
case SBI_EXT_HSM_HART_START:
ret = sbi_hsm_hart_start(scratch, args[0], args[1], args[2]);
break;
case SBI_EXT_HSM_HART_STOP:
ret = sbi_hsm_hart_stop(scratch, TRUE);
break;
case SBI_EXT_HSM_HART_GET_STATUS:
hstate = sbi_hsm_hart_get_state(scratch, args[0]);
ret = sbi_hsm_hart_state_to_status(hstate);
break;
default:
ret = SBI_ENOTSUPP;
};
if (ret >= 0) {
*out_val = ret;
ret = 0;
}
return ret;
}
struct sbi_ecall_extension ecall_hsm = {
.extid_start = SBI_EXT_HSM,
.extid_end = SBI_EXT_HSM,
.handle = sbi_ecall_hsm_handler,
};