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RISC-V: Print SBI info at startup

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SBI version 0.2 introduces functions for obtaining the details of the
SBI implementation, such as version and implemntation ID. Print this
info at startup when it is available.

Reviewed by:	jhb, kp
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D22327
This commit is contained in:
Mitchell Horne 2019-11-15 03:40:02 +00:00
parent 0a0f40c768
commit a109294221
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354722
3 changed files with 39 additions and 0 deletions
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1
sys/riscv/include/sbi.h
View File

@ -201,6 +201,7 @@ sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
start, size, asid);
}
void sbi_print_version(void);
void sbi_init(void);
#endif /* !_MACHINE_SBI_H_ */

1
sys/riscv/riscv/machdep.c
View File

@ -128,6 +128,7 @@ static void
cpu_startup(void *dummy)
{
sbi_print_version();
identify_cpu();
printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)realmem),

37
sys/riscv/riscv/sbi.c
View File

@ -35,6 +35,10 @@ __FBSDID("$FreeBSD$");
#include <machine/md_var.h>
#include <machine/sbi.h>
/* SBI Implementation-Specific Definitions */
#define OPENSBI_VERSION_MAJOR_OFFSET 16
#define OPENSBI_VERSION_MINOR_MASK 0xFFFF
u_long sbi_spec_version;
u_long sbi_impl_id;
u_long sbi_impl_version;
@ -76,6 +80,39 @@ sbi_get_mimpid(void)
return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_MIMPID));
}
void
sbi_print_version(void)
{
u_int major;
u_int minor;
/* For legacy SBI implementations. */
if (sbi_spec_version == 0) {
printf("SBI: Unknown (Legacy) Implementation\n");
printf("SBI Specification Version: 0.1\n");
return;
}
switch (sbi_impl_id) {
case (SBI_IMPL_ID_BBL):
printf("SBI: Berkely Boot Loader %u\n", sbi_impl_version);
break;
case (SBI_IMPL_ID_OPENSBI):
major = sbi_impl_version >> OPENSBI_VERSION_MAJOR_OFFSET;
minor = sbi_impl_version & OPENSBI_VERSION_MINOR_MASK;
printf("SBI: OpenSBI v%u.%u\n", major, minor);
break;
default:
printf("SBI: Unrecognized Implementation: %u\n", sbi_impl_id);
break;
}
major = (sbi_spec_version & SBI_SPEC_VERS_MAJOR_MASK) >>
SBI_SPEC_VERS_MAJOR_OFFSET;
minor = (sbi_spec_version & SBI_SPEC_VERS_MINOR_MASK);
printf("SBI Specification Version: %u.%u\n", major, minor);
}
void
sbi_init(void)
{