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lib: Add initial sbi_exit() API

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This patch adds initial implementation of sbi_exit() API which
can be used to perform OpenSBI exit sequence for current HART.

The sbi_exit() implementation will be further extended by
subsequent patches.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-01-03 08:49:23 +05:30
parent e746673a79
commit c3e406f160
2 changed files with 24 additions and 0 deletions
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2
include/sbi/sbi_init.h
View File

@@ -16,4 +16,6 @@ struct sbi_scratch;
void __noreturn sbi_init(struct sbi_scratch *scratch);
void __noreturn sbi_exit(struct sbi_scratch *scratch);
#endif

22
lib/sbi/sbi_init.c
View File

@@ -183,3 +183,25 @@ void __noreturn sbi_init(struct sbi_scratch *scratch)
else
init_warmboot(scratch, hartid);
}
/**
* Exit OpenSBI library for current HART and stop HART
*
* The function expects following:
* 1. The 'mscratch' CSR is pointing to sbi_scratch of current HART
* 2. Stack pointer (SP) is setup for current HART
*
* @param scratch pointer to sbi_scratch of current HART
*/
void __noreturn sbi_exit(struct sbi_scratch *scratch)
{
u32 hartid = sbi_current_hartid();
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (sbi_platform_hart_disabled(plat, hartid))
sbi_hart_hang();
sbi_hart_unmark_available(hartid);
sbi_hart_hang();
}