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lib: sbi: Fix 32/64 bits variable compatibility

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On RV64,"unsigned long" is 64bit and "unsigned int" is 32bit. So in
function "pmp_get" and "pmp_set", if "pmpcfg_shift >= 32", "0xff << pmpcfg_shift"
will go beyond "unsigned int" width. This patch tries to fix this issue.

In function 'pmp_get':
	cfgmask = (0xff << pmpcfg_shift);
			-->
	cfgmask = (0xffUL << pmpcfg_shift);
In function 'pmp_set':
	cfgmask = ~(0xff << pmpcfg_shift);
			-->
	cfgmask = ~(0xffUL << pmpcfg_shift);

Signed-off-by: Liush <liush.damon@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Liush
2020-06-19 11:55:19 +08:00
committed by Anup Patel
parent db56ef367c
commit 9bd5f8f17d
1 changed files with 2 additions and 2 deletions
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4
lib/sbi/riscv_asm.c
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@@ -268,7 +268,7 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
/* encode PMP config */
prot |= (log2len == PMP_SHIFT) ? PMP_A_NA4 : PMP_A_NAPOT;
cfgmask = ~(0xff << pmpcfg_shift);
cfgmask = ~(0xffUL << pmpcfg_shift);
pmpcfg = (csr_read_num(pmpcfg_csr) & cfgmask);
pmpcfg |= ((prot << pmpcfg_shift) & ~cfgmask);
@@ -320,7 +320,7 @@ int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out,
return SBI_ENOTSUPP;
/* decode PMP config */
cfgmask = (0xff << pmpcfg_shift);
cfgmask = (0xffUL << pmpcfg_shift);
pmpcfg = csr_read_num(pmpcfg_csr) & cfgmask;
prot = pmpcfg >> pmpcfg_shift;