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lib: fix csr detect support

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csr_read_allowed/csr_read_allowed requires trap.case to detect the results,
but if no exception occurs, the value of trap.case will remain unchanged,
which makes the detection results unreliable. Add code to initialize
trap.case to 0.

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Xiang W
2021-04-01 15:59:40 +08:00
committed by Anup Patel
parent 4ef2f5d3e6
commit 3d8a952737
2 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/sbi/sbi_csr_detect.h
View File

@@ -12,6 +12,7 @@
#include <sbi/riscv_encoding.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_trap.h>
#define csr_read_allowed(csr_num, trap) \
({ \
@@ -19,6 +20,7 @@
register ulong ttmp asm("a4"); \
register ulong mtvec = sbi_hart_expected_trap_addr(); \
register ulong ret = 0; \
((struct sbi_trap_info *)(trap))->cause = 0; \
asm volatile( \
"add %[ttmp], %[tinfo], zero\n" \
"csrrw %[mtvec], " STR(CSR_MTVEC) ", %[mtvec]\n" \
@@ -36,6 +38,7 @@
register ulong tinfo asm("a3") = (ulong)trap; \
register ulong ttmp asm("a4"); \
register ulong mtvec = sbi_hart_expected_trap_addr(); \
((struct sbi_trap_info *)(trap))->cause = 0; \
asm volatile( \
"add %[ttmp], %[tinfo], zero\n" \
"csrrw %[mtvec], " STR(CSR_MTVEC) ", %[mtvec]\n" \

3
lib/sbi/sbi_hart.c
View File

@@ -406,7 +406,6 @@ __mhpm_skip:
#undef __check_csr
/* Detect if hart supports SCOUNTEREN feature */
trap.cause = 0;
val = csr_read_allowed(CSR_SCOUNTEREN, (unsigned long)&trap);
if (!trap.cause) {
csr_write_allowed(CSR_SCOUNTEREN, (unsigned long)&trap, val);
@@ -415,7 +414,6 @@ __mhpm_skip:
}
/* Detect if hart supports MCOUNTEREN feature */
trap.cause = 0;
val = csr_read_allowed(CSR_MCOUNTEREN, (unsigned long)&trap);
if (!trap.cause) {
csr_write_allowed(CSR_MCOUNTEREN, (unsigned long)&trap, val);
@@ -424,7 +422,6 @@ __mhpm_skip:
}
/* Detect if hart supports time CSR */
trap.cause = 0;
csr_read_allowed(CSR_TIME, (unsigned long)&trap);
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_TIME;