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add explanatory comments for do_div(), used when WOLFSSL_LINUXKM.

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Daniel Pouzzner
2020-09-08 23:59:58 -05:00
parent 8496a64ed4
commit 453698ba27
2 changed files with 3 additions and 0 deletions
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1
wolfcrypt/src/integer.c
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@ -4562,6 +4562,7 @@ static int mp_div_d (mp_int * a, mp_digit b, mp_int * c, mp_digit * d)
if (w >= b) {
#ifdef WOLFSSL_LINUXKM
t = (mp_digit)w;
/* Linux kernel macro for in-place 64 bit integer division. */
do_div(t, b);
#else
t = (mp_digit)(w / b);

2
wolfcrypt/src/tfm.c
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@ -754,6 +754,7 @@ int fp_div(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
tmp = ((fp_word) x->dp[i]) << ((fp_word) DIGIT_BIT);
tmp |= ((fp_word) x->dp[i - 1]);
#ifdef WOLFSSL_LINUXKM
/* Linux kernel macro for in-place 64 bit integer division. */
do_div(tmp, (fp_word)y->dp[t]);
#else
tmp /= ((fp_word)y->dp[t]);
@ -4566,6 +4567,7 @@ static int fp_div_d(fp_int *a, fp_digit b, fp_int *c, fp_digit *d)
if (w >= b) {
#ifdef WOLFSSL_LINUXKM
t = (fp_digit)w;
/* Linux kernel macro for in-place 64 bit integer division. */
do_div(t, b);
#else
t = (fp_digit)(w / b);