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riscv: provide missing base extension functions

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Provide library functions to read:

* machine vendor ID
* machine architecture ID
* machine implementation ID

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Heinrich Schuchardt
2022-03-17 07:36:14 +01:00
committed by Leo Yu-Chi Liang
parent 70ae54bd25
commit ca7e93fa9f
2 changed files with 68 additions and 0 deletions
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3
arch/riscv/include/asm/sbi.h
View File

@@ -155,6 +155,9 @@ long sbi_get_spec_version(void);
int sbi_get_impl_id(void);
int sbi_get_impl_version(long *version);
int sbi_probe_extension(int ext);
int sbi_get_mvendorid(long *mvendorid);
int sbi_get_marchid(long *marchid);
int sbi_get_mimpid(long *mimpid);
void sbi_srst_reset(unsigned long type, unsigned long reason);
#endif

65
arch/riscv/lib/sbi.c
View File

@@ -127,6 +127,71 @@ int sbi_probe_extension(int extid)
return -ENOTSUPP;
}
/**
* sbi_get_mvendorid() - get machine vendor ID
*
* @mimpid: on return machine vendor ID
* Return: 0 on success
*/
int sbi_get_mvendorid(long *mvendorid)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MVENDORID,
0, 0, 0, 0, 0, 0);
if (ret.error)
return -ENOTSUPP;
if (mvendorid)
*mvendorid = ret.value;
return 0;
}
/**
* sbi_get_marchid() - get machine architecture ID
*
* @mimpid: on return machine architecture ID
* Return: 0 on success
*/
int sbi_get_marchid(long *marchid)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MARCHID,
0, 0, 0, 0, 0, 0);
if (ret.error)
return -ENOTSUPP;
if (marchid)
*marchid = ret.value;
return 0;
}
/**
* sbi_get_mimpid() - get machine implementation ID
*
* @mimpid: on return machine implementation ID
* Return: 0 on success
*/
int sbi_get_mimpid(long *mimpid)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MIMPID,
0, 0, 0, 0, 0, 0);
if (ret.error)
return -ENOTSUPP;
if (mimpid)
*mimpid = ret.value;
return 0;
}
/**
* sbi_srst_reset() - invoke system reset extension
*