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Add support for HSM SBI extension

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The Hardware State Management (HSM) extension provides a set of SBI
calls that allow the supervisor software to start and stop hart
execution.

The HSM extension has been implemented in OpenSBI and is present in
the v0.7 release.

[1] https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc

Reviewed by:	br
Differential Revision:	https://reviews.freebsd.org/D24496
This commit is contained in:
Mitchell Horne 2020-05-01 21:55:51 +00:00
parent df62bf00a5
commit bfe918fa0e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=360552
2 changed files with 60 additions and 0 deletions
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35
sys/riscv/include/sbi.h
View File

@ -55,6 +55,7 @@
#define SBI_ERR_INVALID_PARAM -3
#define SBI_ERR_DENIED -4
#define SBI_ERR_INVALID_ADDRESS -5
#define SBI_ERR_ALREADY_AVAILABLE -6
/* SBI Base Extension */
#define SBI_EXT_ID_BASE 0x10
@ -66,6 +67,16 @@
#define SBI_BASE_GET_MARCHID 5
#define SBI_BASE_GET_MIMPID 6
/* Hart State Management (HSM) Extension */
#define SBI_EXT_ID_HSM 0x48534D
#define SBI_HSM_HART_START 0
#define SBI_HSM_HART_STOP 1
#define SBI_HSM_HART_STATUS 2
#define SBI_HSM_STATUS_STARTED 0
#define SBI_HSM_STATUS_STOPPED 1
#define SBI_HSM_STATUS_START_PENDING 2
#define SBI_HSM_STATUS_STOP_PENDING 3
/* Legacy Extensions */
#define SBI_SET_TIMER 0
#define SBI_CONSOLE_PUTCHAR 1
@ -128,6 +139,30 @@ sbi_probe_extension(long id)
return (SBI_CALL1(SBI_EXT_ID_BASE, SBI_BASE_PROBE_EXTENSION, id).value);
}
/* Hart State Management extension functions. */
/*
* Start execution on the specified hart at physical address start_addr. The
* register a0 will contain the hart's ID, and a1 will contain the value of
* priv.
*/
int sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv);
/*
* Stop execution on the current hart. Interrupts should be disabled, or this
* function may return.
*/
void sbi_hsm_hart_stop(void);
/*
* Get the execution status of the specified hart. The status will be one of:
* - SBI_HSM_STATUS_STARTED
* - SBI_HSM_STATUS_STOPPED
* - SBI_HSM_STATUS_START_PENDING
* - SBI_HSM_STATUS_STOP_PENDING
*/
int sbi_hsm_hart_status(u_long hart);
/* Legacy extension functions. */
static __inline void
sbi_console_putchar(int ch)

25
sys/riscv/riscv/sbi.c
View File

@ -113,6 +113,31 @@ sbi_print_version(void)
printf("SBI Specification Version: %u.%u\n", major, minor);
}
int
sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv)
{
struct sbi_ret ret;
ret = SBI_CALL3(SBI_EXT_ID_HSM, SBI_HSM_HART_START, hart, start_addr, priv);
return (ret.error != 0 ? (int)ret.error : 0);
}
void
sbi_hsm_hart_stop(void)
{
(void)SBI_CALL0(SBI_EXT_ID_HSM, SBI_HSM_HART_STOP);
}
int
sbi_hsm_hart_status(u_long hart)
{
struct sbi_ret ret;
ret = SBI_CALL1(SBI_EXT_ID_HSM, SBI_HSM_HART_STATUS, hart);
return (ret.error != 0 ? (int)ret.error : (int)ret.value);
}
void
sbi_init(void)
{