Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

include: sbi: Introduce nascent_init() platform callback

Browse Source 
We introduce nascent_init() platform callback which will allow
platforms to do very early initialization of platform specific
per-HART CSRs and per-HART devices.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2021-06-29 13:14:04 +05:30
committed by Anup Patel
parent 5f56314618
commit 10509405b2
2 changed files with 28 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
include/sbi/sbi_platform.h
View File

@@ -64,6 +64,9 @@ enum sbi_platform_features {
/** Platform functions */
struct sbi_platform_operations {
/* Platform nascent initialization */
int (*nascent_init)(void);
/** Platform early initialization */
int (*early_init)(bool cold_boot);
/** Platform final initialization */
@@ -299,6 +302,23 @@ static inline bool sbi_platform_hart_invalid(const struct sbi_platform *plat,
return FALSE;
}
/**
* Nascent (very early) initialization for current HART
*
* NOTE: This function can be used to do very early initialization of
* platform specific per-HART CSRs and devices.
*
* @param plat pointer to struct sbi_platform
*
* @return 0 on success and negative error code on failure
*/
static inline int sbi_platform_nascent_init(const struct sbi_platform *plat)
{
if (plat && sbi_platform_ops(plat)->nascent_init)
return sbi_platform_ops(plat)->nascent_init();
return 0;
}
/**
* Early initialization for current HART
*

8
lib/sbi/sbi_init.c
View File

@@ -494,6 +494,14 @@ void __noreturn sbi_init(struct sbi_scratch *scratch)
if (next_mode_supported && atomic_xchg(&coldboot_lottery, 1) == 0)
coldboot = TRUE;
/*
* Do platform specific nascent (very early) initialization so
* that platform can initialize platform specific per-HART CSRs
* or per-HART devices.
*/
if (sbi_platform_nascent_init(plat))
sbi_hart_hang();
if (coldboot)
init_coldboot(scratch, hartid);
else