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lib: Add support for hart specific features

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There may be some features which are hart specific rather than a platform
specific feature. Add a framework to support that.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-05-09 16:47:27 -07:00
committed by Anup Patel
parent 79d0fadb06
commit 6a053f6e6c
2 changed files with 24 additions and 0 deletions
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1
include/sbi/sbi_hart.h
View File

@@ -26,6 +26,7 @@ void sbi_hart_delegation_dump(struct sbi_scratch *scratch);
void sbi_hart_pmp_dump(struct sbi_scratch *scratch);
int sbi_hart_pmp_check_addr(struct sbi_scratch *scratch, unsigned long daddr,
unsigned long attr);
bool sbi_hart_has_feature(u32 hartid, unsigned long feature);
void __attribute__((noreturn)) sbi_hart_hang(void);

23
lib/sbi/sbi_hart.c
View File

@@ -22,6 +22,7 @@ extern void __sbi_expected_trap(void);
extern void __sbi_expected_trap_hext(void);
void (*sbi_hart_expected_trap)(void) = &__sbi_expected_trap;
static unsigned long hart_features_offset;
static void mstatus_init(struct sbi_scratch *scratch, u32 hartid)
{
@@ -209,14 +210,36 @@ static int pmp_init(struct sbi_scratch *scratch, u32 hartid)
return 0;
}
bool sbi_hart_has_feature(u32 hartid, unsigned long feature)
{
unsigned long *hart_features;
struct sbi_scratch *scratch;
scratch = sbi_hartid_to_scratch(hartid);
hart_features = sbi_scratch_offset_ptr(scratch, hart_features_offset);
if (*hart_features & feature)
return true;
else
return false;
}
int sbi_hart_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot)
{
int rc;
unsigned long *hart_features;
if (cold_boot) {
if (misa_extension('H'))
sbi_hart_expected_trap = &__sbi_expected_trap_hext;
hart_features_offset = sbi_scratch_alloc_offset(
sizeof(hart_features),
"HART_FEATURES");
if (!hart_features_offset)
return SBI_ENOMEM;
}
hart_features = sbi_scratch_offset_ptr(scratch, hart_features_offset);
*hart_features = 0;
mstatus_init(scratch, hartid);