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platform: Move platform features to hart

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PMP & performance counters belong to a hart rather than a platform.
In addition to that, these features enable reading/writing from a
particular csr. Thus, they can be detected and set at runtime rather
than compile time.

Move PMP/MCOUNTEREN/SCOUNTEREN features to hart and detect them at runtime.

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 16:47:28 -07:00
committed by Anup Patel
parent 6a053f6e6c
commit b2df751acf
7 changed files with 77 additions and 36 deletions
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11
include/sbi/sbi_hart.h
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@@ -12,6 +12,16 @@
#include <sbi/sbi_types.h>
/** Possible feature flags of a hart */
enum sbi_hart_features {
/** Hart has PMP support */
SBI_HART_HAS_PMP = (1 << 0),
/** Hart has S-mode counter enable */
SBI_HART_HAS_SCOUNTEREN = (1 << 1),
/** Hart has M-mode counter enable */
SBI_HART_HAS_MCOUNTEREN = (1 << 2),
};
struct sbi_scratch;
int sbi_hart_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot);
@@ -27,6 +37,7 @@ 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);
unsigned long sbi_hart_get_features(u32 hartid);
void __attribute__((noreturn)) sbi_hart_hang(void);