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include: sbi: Store the hart index in struct sbi_scratch

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This is a more efficient way to get the index of the current hart than
calling a function to loop through the hartindex -> hartid lookup table.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2024-08-30 08:49:06 -07:00
committed by Anup Patel
parent 4ac1818197
commit 9d7a983060
2 changed files with 11 additions and 1 deletions
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2
firmware/fw_base.S
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@@ -218,6 +218,8 @@ _scratch_init:
#endif
REG_S a0, SBI_SCRATCH_OPTIONS_OFFSET(tp)
MOV_3R a0, s0, a1, s1, a2, s2
/* Store hart index in scratch space */
REG_S t1, SBI_SCRATCH_HARTINDEX_OFFSET(tp)
/* Move to next scratch space */
add t1, t1, t2
blt t1, s7, _scratch_init

10
include/sbi/sbi_scratch.h
View File

@@ -42,8 +42,10 @@
#define SBI_SCRATCH_TMP0_OFFSET (12 * __SIZEOF_POINTER__)
/** Offset of options member in sbi_scratch */
#define SBI_SCRATCH_OPTIONS_OFFSET (13 * __SIZEOF_POINTER__)
/** Offset of hartindex member in sbi_scratch */
#define SBI_SCRATCH_HARTINDEX_OFFSET (14 * __SIZEOF_POINTER__)
/** Offset of extra space in sbi_scratch */
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (14 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (15 * __SIZEOF_POINTER__)
/** Maximum size of sbi_scratch (4KB) */
#define SBI_SCRATCH_SIZE (0x1000)
@@ -83,6 +85,8 @@ struct sbi_scratch {
unsigned long tmp0;
/** Options for OpenSBI library */
unsigned long options;
/** Index of the hart */
unsigned long hartindex;
};
/**
@@ -202,6 +206,10 @@ do { \
= (__type)(__ptr); \
} while (0)
/** Get the hart index of the current hart */
#define current_hartindex() \
(sbi_scratch_thishart_ptr()->hartindex)
/** Last HART index having a sbi_scratch pointer */
extern u32 last_hartindex_having_scratch;